144 files changed, 3625 insertions, 2675 deletions

diff --git a/src/binary_reader.cpp b/src/blu_cat/com/binary_reader.cpp
index 0727703..bb4d231 100644
--- a/src/binary_reader.cpp
+++ b/src/blu_cat/com/binary_reader.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2023 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,24 +16,25 @@
 
 #include "binary_reader.hpp"
 
+#include <bit>
 #include <fstream>
 
 namespace
 {
 
 union IntAndFloat32bit{
-  uint32_t i;
-  float f;
+  UI32 i;
+  F32 f;
 };
 
 union IntAndFloat64bit{
-  uint64_t i;
-  double f;
+  UI64 i;
+  F64 f;
 };
 
 }
 
-BinaryReader::BinaryReader(std::string file_path):
+BinaryReader::BinaryReader(const std::string &file_path):
   _pointer{0}
 {
   std::ifstream file(file_path, std::ios::binary | std::ios::ate);
@@ -46,7 +47,7 @@ BinaryReader::BinaryReader(std::string file_path):
 
   this->_size = file.tellg();
   file.seekg(0);
-  this->data = new uint8_t[this->_size];
+  this->data = new UI8[this->_size];
   file.read((char*)data, this->_size);
 }
 
@@ -60,36 +61,54 @@ BinaryReader::~BinaryReader()
   delete[] this->data;
 }
 
-uint8_t
+UI8
 BinaryReader::read_ui8()
 {
   return this->data[this->_pointer++];
 }
 
-uint32_t
+UI32
 BinaryReader::read_ui32()
 {
-  uint8_t b1{this->data[_pointer++]}, b2{this->data[_pointer++]},
+  UI8 b1{this->data[_pointer++]}, b2{this->data[_pointer++]},
     b3{this->data[_pointer++]}, b4{this->data[_pointer++]};
 
   return b1 << 24 | b2 << 16 | b3 << 8 | b4;
 }
 
-uint64_t
+UI64
 BinaryReader::read_ui64()
 {
-  uint8_t b1{this->data[_pointer++]}, b2{this->data[_pointer++]},
+  UI8 b1{this->data[_pointer++]}, b2{this->data[_pointer++]},
     b3{this->data[_pointer++]}, b4{this->data[_pointer++]},
     b5{this->data[_pointer++]}, b6{this->data[_pointer++]},
     b7{this->data[_pointer++]}, b8{this->data[_pointer++]};
 
-  return (uint64_t)b1 << 56 | (uint64_t)b2 << 48 | (uint64_t)b3 << 40 |
-    (uint64_t)b4 << 32 | (uint64_t)b5 << 24 | (uint64_t)b6 << 16 |
-    (uint64_t)b7 << 8 | (uint64_t)b8;
+  return (UI64)b1 << 56 | (UI64)b2 << 48 | (UI64)b3 << 40 |
+    (UI64)b4 << 32 | (UI64)b5 << 24 | (UI64)b6 << 16 |
+    (UI64)b7 << 8 | (UI64)b8;
 }
 
-float
-BinaryReader::read_float()
+I8
+BinaryReader::read_i8()
+{
+	return std::bit_cast<I8>(this->read_ui8());
+}
+
+I32
+BinaryReader::read_i32()
+{
+	return std::bit_cast<I32>(this->read_ui32());
+}
+
+I64
+BinaryReader::read_i64()
+{
+	return std::bit_cast<I64>(this->read_ui64());
+}
+
+F32
+BinaryReader::read_f32()
 {
   IntAndFloat32bit num;
   num.i = read_ui32();
@@ -97,8 +116,8 @@ BinaryReader::read_float()
   return num.f;
 }
 
-double
-BinaryReader::read_double()
+F64
+BinaryReader::read_f64()
 {
   IntAndFloat64bit num;
   num.i = read_ui64();
diff --git a/src/binary_reader.hpp b/src/blu_cat/com/binary_reader.hpp
index e09c13a..fec88b6 100644
--- a/src/binary_reader.hpp
+++ b/src/blu_cat/com/binary_reader.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,43 +14,54 @@
  * limitations under the License.
  */
 
-#include <cstdint>
+#ifndef BLU_CAT_COM_BINARY_READER_H
+#define BLU_CAT_COM_BINARY_READER_H 1
+
 #include <string>
 
-#include "blucat/core.hpp"
+#include "numbers.hpp"
 
 class BinaryReader
 {
-  int _pointer;
-  int _size;
-  uint8_t *data;
+  UI64F _pointer;
+  UI64F _size;
+  UI8 *data;
 
 public:
 
-  BinaryReader(const std::string file_path);
+  BinaryReader(const std::string &file_path);
   BinaryReader(const char *file_path);
   ~BinaryReader();
 
-  inline int
+  inline UI64F
   pointer(){return this->_pointer;};
 
-  inline int
+  inline UI64F
   size(){return this->_size;};
 
-  uint8_t
+  UI8
   read_ui8();
 
-  uint32_t
+  UI32
   read_ui32();
 
-  uint64_t
+  UI64
   read_ui64();
 
-  float
-  read_float();
+  I8
+  read_i8();
+
+  I32
+  read_i32();
+
+  I64
+  read_i64();
 
-  double
-  read_double();
+  F32
+  read_f32();
+
+  F64
+  read_f64();
 
   glm::vec2
   read_vec2();
@@ -67,3 +78,5 @@ public:
   void
   read_chars(char *str, int size);
 };
+
+#endif /* BLU_CAT_COM_BINARY_READER_H */
diff --git a/src/blu_cat/com/binary_writer.cpp b/src/blu_cat/com/binary_writer.cpp
new file mode 100644
index 0000000..7af3b6d
--- /dev/null
+++ b/src/blu_cat/com/binary_writer.cpp
@@ -0,0 +1,180 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "binary_writer.hpp"
+
+namespace
+{
+
+union IntAndFloat32bit{
+  UI32 i;
+  F32 f;
+};
+
+union IntAndFloat64bit{
+  UI64 i;
+  F64 f;
+};
+
+}
+
+BinaryWriter::BinaryWriter(const char *file_path):
+  output{file_path, std::ios::binary}
+{
+}
+
+BinaryWriter::BinaryWriter(const std::string &file_path):
+  BinaryWriter{file_path.c_str()}
+{
+}
+
+void
+BinaryWriter::write_ui8(UI8 var)
+{
+	this->output.put(var);
+}
+
+void
+BinaryWriter::write_ui32(UI32 var)
+{
+  using namespace std;
+
+  UI8 b1 = var >> 24;
+  UI8 b2 = var >> 16;
+  UI8 b3 = var >> 8;
+  UI8 b4 = var;
+
+  this->output.put(b1);
+  this->output.put(b2);
+  this->output.put(b3);
+  this->output.put(b4);
+}
+
+void
+BinaryWriter::write_ui64(UI64 var)
+{
+  using namespace std;
+
+  UI8 b1 = var >> 56;
+  UI8 b2 = var >> 48;
+  UI8 b3 = var >> 40;
+  UI8 b4 = var >> 32;
+  UI8 b5 = var >> 24;
+  UI8 b6 = var >> 16;
+  UI8 b7 = var >> 8;
+  UI8 b8 = var;
+
+  this->output.put(b1);
+  this->output.put(b2);
+  this->output.put(b3);
+  this->output.put(b4);
+  this->output.put(b5);
+  this->output.put(b6);
+  this->output.put(b7);
+  this->output.put(b8);
+}
+
+void
+BinaryWriter::write_i8(I8 var)
+{
+	this->write_ui8(std::bit_cast<UI8>(var));
+}
+
+void
+BinaryWriter::write_i32(I32 var)
+{
+	this->write_ui32(std::bit_cast<UI32>(var));
+}
+
+void
+BinaryWriter::write_i64(I64 var)
+{
+	this->write_ui64(std::bit_cast<UI64>(var));
+}
+
+void
+BinaryWriter::write_f32(F32 var)
+{
+  IntAndFloat32bit num;
+  num.f = var;
+  write_ui32(num.i);
+}
+
+void
+BinaryWriter::write_f64(F64 var)
+{
+  IntAndFloat64bit num;
+  num.f = var;
+  write_ui64(num.i);
+}
+
+void
+BinaryWriter::write_vec2(glm::vec2 var)
+{
+  IntAndFloat32bit x, y;
+  x.f = var.x;
+  y.f = var.y;
+
+  this->write_ui32(x.i);
+  this->write_ui32(y.i);
+}
+
+void
+BinaryWriter::write_vec3(glm::vec3 var)
+{
+  IntAndFloat32bit x, y, z;
+  x.f = var.x;
+  y.f = var.y;
+  z.f = var.z;
+
+  this->write_ui32(x.i);
+  this->write_ui32(y.i);
+  this->write_ui32(z.i);
+}
+
+void
+BinaryWriter::write_quat(glm::quat var)
+{
+  IntAndFloat32bit w, x, y, z;
+  w.f = var.w;
+  x.f = var.x;
+  y.f = var.y;
+  z.f = var.z;
+
+  this->write_ui32(w.i);
+  this->write_ui32(x.i);
+  this->write_ui32(y.i);
+  this->write_ui32(z.i);
+}
+
+void
+BinaryWriter::write_mat4(glm::mat4 var)
+{
+  float *offset_matrix_data{glm::value_ptr(var)};
+  IntAndFloat32bit num;
+
+  for(int i{0}; i < 16; i++)
+  {
+    num.f = offset_matrix_data[i];
+    this->write_ui32(num.i);
+  }
+}
+
+void
+BinaryWriter::write_chars(const char *str, int size)
+{
+  for(int i{0}; i < size; i++) this->write_ui8((UI8)str[i]);
+}
diff --git a/src/blu_cat/com/binary_writer.hpp b/src/blu_cat/com/binary_writer.hpp
new file mode 100644
index 0000000..76bccb3
--- /dev/null
+++ b/src/blu_cat/com/binary_writer.hpp
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BLU_CAT_COM_BINARY_WRITER_H
+#define BLU_CAT_COM_BINARY_WRITER_H 1
+
+#include <fstream>
+#include <string>
+
+#include "numbers.hpp"
+
+class BinaryWriter
+{
+  std::ofstream output;
+
+public:
+
+  BinaryWriter(const std::string &file_path);
+	BinaryWriter(const char *file_path);
+
+  void
+  write_ui8(UI8 var);
+
+  void
+  write_ui32(UI32 var);
+
+  void
+  write_ui64(UI64 var);
+
+  void
+  write_i8(I8 var);
+
+  void
+  write_i32(I32 var);
+
+  void
+  write_i64(I64 var);
+
+  void
+  write_f32(F32 var);
+
+  void
+  write_f64(F64 var);
+
+  void
+  write_vec2(glm::vec2 var);
+
+  void
+  write_vec3(glm::vec3 var);
+
+  void
+  write_quat(glm::quat var);
+
+  void
+  write_mat4(glm::mat4 var);
+
+	void
+	write_chars(const char *str, int size);
+};
+
+#endif /* BLU_CAT_COM_BINARY_WRITER_H */
diff --git a/src/command.cpp b/src/blu_cat/com/command.cpp
index a1d3240..a1d3240 100644
--- a/src/command.cpp
+++ b/src/blu_cat/com/command.cpp
diff --git a/src/command.hpp b/src/blu_cat/com/command.hpp
index 47552a5..5079c58 100644
--- a/src/command.hpp
+++ b/src/blu_cat/com/command.hpp
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_COMMAND_CHAIN_H
-#define CANDY_GEAR_COMMAND_CHAIN_H 1
+#ifndef BLU_CAT_COM_COMMAND_CHAIN_H
+#define BLU_CAT_COM_COMMAND_CHAIN_H 1
 
 #include <cstdint>
 #include <initializer_list>
@@ -89,4 +89,4 @@ public:
 
 };
 
-#endif /* CANDY_GEAR_COMMAND_CHAIN_H */
+#endif /* BLU_CAT_COM_COMMAND_CHAIN_H */
diff --git a/src/job_queue.cpp b/src/blu_cat/com/job_queue.cpp
index 49bf34f..beaf989 100644
--- a/src/job_queue.cpp
+++ b/src/blu_cat/com/job_queue.cpp
@@ -18,6 +18,9 @@
 
 #include <chrono>
 
+namespace BluCat::COM
+{
+
 JobQueue::JobQueue():
   jobs{},
   _stop{false}
@@ -59,3 +62,5 @@ JobQueue::pop()
     return Job{nullptr};
   }
 }
+
+}
diff --git a/src/job_queue.hpp b/src/blu_cat/com/job_queue.hpp
index 2a7735b..856946d 100644
--- a/src/job_queue.hpp
+++ b/src/blu_cat/com/job_queue.hpp
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_JOB_QUEUE_H
-#define CANDY_GEAR_JOB_QUEUE_H 1
+#ifndef BLU_CAT_COM_JOB_QUEUE_H
+#define BLU_CAT_COM_JOB_QUEUE_H 1
 
 #include <atomic>
 #include <condition_variable>
@@ -23,6 +23,9 @@
 #include <functional>
 #include <mutex>
 
+namespace BluCat::COM
+{
+
 class Worker;
 
 typedef std::function<void(void)> Job;
@@ -49,4 +52,6 @@ public:
   push(Job job);
 };
 
-#endif /* CANDY_GEAR_JOB_QUEUE_H */
+}
+
+#endif /* BLU_CAT_COM_JOB_QUEUE_H */
diff --git a/src/blucat/core.hpp b/src/blu_cat/com/numbers.hpp
index 169e3bc..1fd3400 100644
--- a/src/blucat/core.hpp
+++ b/src/blu_cat/com/numbers.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,8 +14,11 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_CORE_H
-#define CANDY_GEAR_BLUCAT_CORE_H 1
+#ifndef BLU_CAT_COM_NUMBERS_H
+#define BLU_CAT_COM_NUMBERS_H 1
+
+#include <cstdint>
+#include <stdfloat>
 
 // GLM uses some definitions to control their behavior, so you should not
 // include it directly. Instead, use this header.
@@ -29,6 +32,35 @@
 #include <glm/gtx/quaternion.hpp>
 #include <glm/vec3.hpp>
 
-#include <vulkan/vulkan.h>
+// Signed int
+typedef int8_t I8;
+typedef int16_t I16;
+typedef int32_t I32;
+typedef int64_t I64;
+
+// Unsigned int
+typedef uint8_t UI8;
+typedef uint16_t UI16;
+typedef uint32_t UI32;
+typedef uint64_t UI64;
+
+// Fast signed int
+typedef int_fast8_t I8F;
+typedef int_fast16_t I16F;
+typedef int_fast32_t I32F;
+typedef int_fast64_t I64F;
+
+// Fast unsigned int
+typedef uint_fast8_t UI8F;
+typedef uint_fast16_t UI16F;
+typedef uint_fast32_t UI32F;
+typedef uint_fast64_t UI64F;
+
+// Floats
+typedef std::float32_t F32;
+typedef std::float64_t F64;
+
+constexpr UI32F SIZE_32_BIT{4};
+constexpr UI32F SIZE_64_BIT{8};
 
-#endif /* CANDY_GEAR_BLUCAT_CORE_H */
+#endif /* BLU_CAT_COM_NUMBERS_H */
diff --git a/src/worker.cpp b/src/blu_cat/com/worker.cpp
index bcf654e..847b571 100644
--- a/src/worker.cpp
+++ b/src/blu_cat/com/worker.cpp
@@ -18,6 +18,9 @@
 
 #include <thread>
 
+namespace BluCat::COM
+{
+
 Worker::Worker(JobQueue *job_queue):
   job_queue{job_queue}
 {
@@ -32,3 +35,5 @@ Worker::operator()()
     if(job) job();
   }
 }
+
+}
diff --git a/src/worker.hpp b/src/blu_cat/com/worker.hpp
index 449e1b0..d74aa24 100644
--- a/src/worker.hpp
+++ b/src/blu_cat/com/worker.hpp
@@ -14,11 +14,14 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_WORKER_H
-#define CANDY_GEAR_WORKER_H 1
+#ifndef BLU_CAT_COM_WORKER_H
+#define BLU_CAT_COM_WORKER_H 1
 
 #include "job_queue.hpp"
 
+namespace BluCat::COM
+{
+
 class Worker
 {
   JobQueue *job_queue;
@@ -30,4 +33,6 @@ public:
   operator()();
 };
 
-#endif /* CANDY_GEAR_WORKER_H */
+}
+
+#endif /* BLU_CAT_COM_WORKER_H */
diff --git a/src/blucat/animation.cpp b/src/blu_cat/gra/animation.cpp
index b4daeef..dc2c281 100644
--- a/src/blucat/animation.cpp
+++ b/src/blu_cat/gra/animation.cpp
@@ -16,7 +16,7 @@
 
 #include "animation.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 Bone::Bone(glm::mat4 offset_matrix):
diff --git a/src/blucat/animation.hpp b/src/blu_cat/gra/animation.hpp
index c789c5e..1275b48 100644
--- a/src/blucat/animation.hpp
+++ b/src/blu_cat/gra/animation.hpp
@@ -14,15 +14,15 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_ANIMATION_H
-#define CANDY_GEAR_BLUCAT_ANIMATION_H 1
+#ifndef BLU_CAT_GRA_ANIMATION_H
+#define BLU_CAT_GRA_ANIMATION_H 1
 
 #include <vector>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "animation/frame.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct Bone
@@ -48,4 +48,4 @@ struct Animation
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_ANIMATION_H */
+#endif /* BLU_CAT_GRA_ANIMATION_H */
diff --git a/src/blucat/animation/frame.hpp b/src/blu_cat/gra/animation/frame.hpp
index a1d5f39..b1ea913 100644
--- a/src/blucat/animation/frame.hpp
+++ b/src/blu_cat/gra/animation/frame.hpp
@@ -14,14 +14,14 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_FRAME_H
-#define CANDY_GEAR_BLUCAT_FRAME_H 1
+#ifndef BLU_CAT_GRA_FRAME_H
+#define BLU_CAT_GRA_FRAME_H 1
 
 #include <vector>
 
-#include "../core.hpp"
+#include "../vulkan.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 template<typename T>
@@ -82,4 +82,4 @@ struct Channel
 };
 
 }
-#endif /* CANDY_GEAR_BLUCAT_FRAME_H */
+#endif /* BLU_CAT_GRA_FRAME_H */
diff --git a/src/blucat/base_buffer.cpp b/src/blu_cat/gra/base_buffer.cpp
index 762c89a..1add9fb 100644
--- a/src/blucat/base_buffer.cpp
+++ b/src/blu_cat/gra/base_buffer.cpp
@@ -16,7 +16,7 @@
 
 #include "base_buffer.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 const CommandChain BaseBuffer::loader{
diff --git a/src/blucat/base_buffer.hpp b/src/blu_cat/gra/base_buffer.hpp
index 03b838c..cb4cdf8 100644
--- a/src/blucat/base_buffer.hpp
+++ b/src/blu_cat/gra/base_buffer.hpp
@@ -14,14 +14,14 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_BASE_BUFFER_H
-#define CANDY_GEAR_BLUCAT_BASE_BUFFER_H 1
+#ifndef BLU_CAT_GRA_BASE_BUFFER_H
+#define BLU_CAT_GRA_BASE_BUFFER_H 1
 
-#include "../command.hpp"
-#include "core.hpp"
+#include "../com/command.hpp"
+#include "vulkan.hpp"
 #include "device.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 class BaseBuffer
@@ -53,4 +53,4 @@ class BaseBuffer
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_BASE_BUFFER_H */
+#endif /* BLU_CAT_GRA_BASE_BUFFER_H */
diff --git a/src/blucat/character.cpp b/src/blu_cat/gra/character.cpp
index c13ffef..f0e7512 100644
--- a/src/blucat/character.cpp
+++ b/src/blu_cat/gra/character.cpp
@@ -16,8 +16,8 @@
 
 #include "character.hpp"
 
-#include "../command.hpp"
-#include "../core.hpp"
+#include "../com/command.hpp"
+#include "../int/core.hpp"
 #include "font.hpp"
 #include "image.hpp"
 #include "source_buffer.hpp"
@@ -27,16 +27,16 @@ namespace
 
 struct CharacterBuilder
 {
-  BluCat::Character *character;
+  BluCat::GRA::Character *character;
   FT_Face face;
   uint32_t character_code;
 
   CharacterBuilder(
-    BluCat::Character *character, FT_Face face, uint32_t character_code);
+    BluCat::GRA::Character *character, FT_Face face, uint32_t character_code);
 };
 
 CharacterBuilder::CharacterBuilder(
-  BluCat::Character *character, FT_Face face, uint32_t character_code):
+  BluCat::GRA::Character *character, FT_Face face, uint32_t character_code):
   character{character},
   face{face},
   character_code{character_code}
@@ -104,8 +104,8 @@ load_image(void *obj)
     }
   }
 
-  BluCat::SourceBuffer source_image_buffer{
-    cg_core.vk_device_with_swapchain, source_image_raw.data(),
+  BluCat::GRA::SourceBuffer source_image_buffer{
+		BluCat::INT::core.vk_device_with_swapchain, source_image_raw.data(),
     image_size};
 
   { // Create Vulkan image.
@@ -116,8 +116,8 @@ load_image(void *obj)
       vk_extent3d.height = self->face->glyph->bitmap.rows;
       vk_extent3d.depth = 1;
 
-      BluCat::Image::create(
-        cg_core.vk_device_with_swapchain,
+      BluCat::GRA::Image::create(
+        BluCat::INT::core.vk_device_with_swapchain,
 	&self->character->image,
 	&self->character->device_memory,
 	VK_FORMAT_R8G8B8A8_UNORM,
@@ -126,21 +126,21 @@ load_image(void *obj)
 	VK_IMAGE_TILING_OPTIMAL,
 	VK_IMAGE_USAGE_TRANSFER_SRC_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT);
     }
-    catch(BluCat::Image::Error error)
+    catch(BluCat::GRA::Image::Error error)
     {
       throw CommandError{error.what()};
     }
   }
 
   { // Copy image from buffer into image.
-    auto queue_family{cg_core.vk_device_with_swapchain->
+    auto queue_family{BluCat::INT::core.vk_device_with_swapchain->
       get_queue_family_with_presentation()};
     auto queue{queue_family->get_queue()};
-    BluCat::CommandPool command_pool{queue_family, 1};
+    BluCat::GRA::CommandPool command_pool{queue_family, 1};
     VkCommandBuffer vk_command_buffer{command_pool.command_buffers[0]};
 
     queue.submit_one_time_command(vk_command_buffer, [&](){
-      BluCat::Image::move_image_state(
+      BluCat::GRA::Image::move_image_state(
         vk_command_buffer, self->character->image, VK_FORMAT_R8G8B8A8_UNORM,
         0, VK_ACCESS_TRANSFER_WRITE_BIT, VK_IMAGE_LAYOUT_UNDEFINED,
         VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, VK_PIPELINE_STAGE_HOST_BIT,
@@ -162,7 +162,7 @@ load_image(void *obj)
         vk_command_buffer, source_image_buffer.buffer, self->character->image,
         VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, 1, &image_copy);
 
-      BluCat::Image::move_image_state(
+      BluCat::GRA::Image::move_image_state(
         vk_command_buffer, self->character->image, VK_FORMAT_R8G8B8A8_UNORM,
         VK_ACCESS_TRANSFER_WRITE_BIT, VK_ACCESS_SHADER_READ_BIT,
         VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
@@ -179,10 +179,11 @@ unload_image(void *obj)
   auto self = static_cast<CharacterBuilder*>(obj);
 
   vkDestroyImage(
-    cg_core.vk_device_with_swapchain->device, self->character->image, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->character->image,
+		nullptr);
   vkFreeMemory(
-    cg_core.vk_device_with_swapchain->device, self->character->device_memory,
-    nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device,
+		self->character->device_memory, nullptr);
 }
 
 const CommandChain loader{
@@ -191,7 +192,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 Character::Character(FT_Face face, uint32_t character_code)
diff --git a/src/blucat/character.hpp b/src/blu_cat/gra/character.hpp
index 43cc765..8968384 100644
--- a/src/blucat/character.hpp
+++ b/src/blu_cat/gra/character.hpp
@@ -14,17 +14,17 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_CHARACTER_H
-#define CANDY_GEAR_BLUCAT_CHARACTER_H 1
+#ifndef BLU_CAT_GRA_CHARACTER_H
+#define BLU_CAT_GRA_CHARACTER_H 1
 
 #include <ft2build.h>
 #include FT_FREETYPE_H
 
-#include "core.hpp"
+#include "vulkan.hpp"
 
 #include <vector>
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct Character
@@ -46,4 +46,4 @@ struct Character
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_CHARACTER_H */
+#endif /* BLU_CAT_GRA_CHARACTER_H */
diff --git a/src/blucat/command_pool.cpp b/src/blu_cat/gra/command_pool.cpp
index 898d7ae..2602522 100644
--- a/src/blucat/command_pool.cpp
+++ b/src/blu_cat/gra/command_pool.cpp
@@ -16,7 +16,7 @@
 
 #include "command_pool.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 const CommandChain CommandPool::loader{
diff --git a/src/blucat/command_pool.hpp b/src/blu_cat/gra/command_pool.hpp
index aa23387..7487365 100644
--- a/src/blucat/command_pool.hpp
+++ b/src/blu_cat/gra/command_pool.hpp
@@ -14,16 +14,16 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_COMMAND_POOL_H
-#define CANDY_GEAR_BLUCAT_COMMAND_POOL_H 1
+#ifndef BLU_CAT_GRA_COMMAND_POOL_H
+#define BLU_CAT_GRA_COMMAND_POOL_H 1
 
 #include <vector>
 
-#include "../command.hpp"
-#include "core.hpp"
+#include "../com/command.hpp"
 #include "device.hpp"
+#include "vulkan.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 class CommandPool
@@ -56,4 +56,4 @@ private:
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_COMMAND_POOL_H */
+#endif /* BLU_CAT_GRA_COMMAND_POOL_H */
diff --git a/src/blucat/descriptor_set_layout.cpp b/src/blu_cat/gra/descriptor_set_layout.cpp
index 0fc5208..e1e8852 100644
--- a/src/blucat/descriptor_set_layout.cpp
+++ b/src/blu_cat/gra/descriptor_set_layout.cpp
@@ -18,7 +18,7 @@
 
 #include <array>
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 
 namespace
 {
@@ -26,7 +26,7 @@ namespace
 void
 load_world(void *obj)
 {
-  auto self = static_cast<BluCat::DescriptorSetLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::DescriptorSetLayout*>(obj);
 
   std::array<VkDescriptorSetLayoutBinding, 2> set_layouts{};
   set_layouts[0].binding = 0;
@@ -49,7 +49,7 @@ load_world(void *obj)
   layout_info.pBindings = set_layouts.data();
 
   if(vkCreateDescriptorSetLayout(
-       cg_core.vk_device_with_swapchain->device, &layout_info, nullptr,
+       BluCat::INT::core.vk_device_with_swapchain->device, &layout_info, nullptr,
        &self->world) != VK_SUCCESS)
     throw CommandError{
       "Failed to create Vulkan descriptor set layout for world view."};
@@ -58,16 +58,16 @@ load_world(void *obj)
 void
 unload_world(void *obj)
 {
-  auto self = static_cast<BluCat::DescriptorSetLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::DescriptorSetLayout*>(obj);
 
   vkDestroyDescriptorSetLayout(
-    cg_core.vk_device_with_swapchain->device, self->world, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->world, nullptr);
 }
 
 void
 load_view(void *obj)
 {
-  auto self = static_cast<BluCat::DescriptorSetLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::DescriptorSetLayout*>(obj);
 
   std::array<VkDescriptorSetLayoutBinding, 1> layout_bindings{};
 
@@ -85,7 +85,7 @@ load_view(void *obj)
   layout_info.pBindings = layout_bindings.data();
 
   if(vkCreateDescriptorSetLayout(
-       cg_core.vk_device_with_swapchain->device, &layout_info, nullptr,
+       BluCat::INT::core.vk_device_with_swapchain->device, &layout_info, nullptr,
        &self->view) != VK_SUCCESS)
     throw CommandError{
       "Failed to create Vulkan descriptor set layout for view."};
@@ -94,16 +94,16 @@ load_view(void *obj)
 void
 unload_view(void *obj)
 {
-  auto self = static_cast<BluCat::DescriptorSetLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::DescriptorSetLayout*>(obj);
 
   vkDestroyDescriptorSetLayout(
-    cg_core.vk_device_with_swapchain->device, self->view, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->view, nullptr);
 }
 
 void
 load_texture(void *obj)
 {
-  auto self = static_cast<BluCat::DescriptorSetLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::DescriptorSetLayout*>(obj);
 
   std::array<VkDescriptorSetLayoutBinding, 1> layout_bindings{};
 
@@ -122,7 +122,7 @@ load_texture(void *obj)
   layout_info.pBindings = layout_bindings.data();
 
   if(vkCreateDescriptorSetLayout(
-       cg_core.vk_device_with_swapchain->device, &layout_info, nullptr,
+       BluCat::INT::core.vk_device_with_swapchain->device, &layout_info, nullptr,
        &self->texture) != VK_SUCCESS)
     throw CommandError{
       "Failed to create Vulkan descriptor set layout for textures."};
@@ -131,16 +131,16 @@ load_texture(void *obj)
 void
 unload_texture(void *obj)
 {
-  auto self = static_cast<BluCat::DescriptorSetLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::DescriptorSetLayout*>(obj);
 
   vkDestroyDescriptorSetLayout(
-    cg_core.vk_device_with_swapchain->device, self->texture, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->texture, nullptr);
 }
 
 void
 load_model(void *obj)
 {
-  auto self = static_cast<BluCat::DescriptorSetLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::DescriptorSetLayout*>(obj);
 
   std::array<VkDescriptorSetLayoutBinding, 1> layout_bindings;
   layout_bindings[0].binding = 0;
@@ -157,7 +157,7 @@ load_model(void *obj)
   layout_info.pBindings = layout_bindings.data();
 
   if(vkCreateDescriptorSetLayout(
-       cg_core.vk_device_with_swapchain->device, &layout_info, nullptr,
+       BluCat::INT::core.vk_device_with_swapchain->device, &layout_info, nullptr,
        &self->model) != VK_SUCCESS)
     throw CommandError{
       "Failed to create Vulkan descriptor set layout for model instance."};
@@ -166,10 +166,10 @@ load_model(void *obj)
 void
 unload_model(void *obj)
 {
-  auto self = static_cast<BluCat::DescriptorSetLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::DescriptorSetLayout*>(obj);
 
   vkDestroyDescriptorSetLayout(
-    cg_core.vk_device_with_swapchain->device, self->model, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->model, nullptr);
 }
 
 const CommandChain loader{
@@ -181,7 +181,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 DescriptorSetLayout::DescriptorSetLayout()
diff --git a/src/blucat/descriptor_set_layout.hpp b/src/blu_cat/gra/descriptor_set_layout.hpp
index 144a137..42003b9 100644
--- a/src/blucat/descriptor_set_layout.hpp
+++ b/src/blu_cat/gra/descriptor_set_layout.hpp
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_DESCRIPTOR_SET_LAYOUT_H
-#define CANDY_GEAR_BLUCAT_DESCRIPTOR_SET_LAYOUT_H 1
+#ifndef BLU_CAT_GRA_DESCRIPTOR_SET_LAYOUT_H
+#define BLU_CAT_GRA_DESCRIPTOR_SET_LAYOUT_H 1
 
-#include "core.hpp"
+#include "vulkan.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct DescriptorSetLayout
@@ -35,4 +35,4 @@ struct DescriptorSetLayout
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_DESCRIPTOR_SET_LAYOUT_H */
+#endif /* BLU_CAT_GRA_DESCRIPTOR_SET_LAYOUT_H */
diff --git a/src/blucat/destination_buffer.cpp b/src/blu_cat/gra/destination_buffer.cpp
index ea5f31e..3c53db4 100644
--- a/src/blucat/destination_buffer.cpp
+++ b/src/blu_cat/gra/destination_buffer.cpp
@@ -18,7 +18,7 @@
 
 #include "command_pool.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 DestinationBuffer::DestinationBuffer(
diff --git a/src/blucat/destination_buffer.hpp b/src/blu_cat/gra/destination_buffer.hpp
index 8c098ab..7df1e50 100644
--- a/src/blucat/destination_buffer.hpp
+++ b/src/blu_cat/gra/destination_buffer.hpp
@@ -14,15 +14,15 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_DESTINATION_BUFFER_H
-#define CANDY_GEAR_BLUCAT_DESTINATION_BUFFER_H 1
+#ifndef BLU_CAT_GRA_DESTINATION_BUFFER_H
+#define BLU_CAT_GRA_DESTINATION_BUFFER_H 1
 
 #include "base_buffer.hpp"
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "source_buffer.hpp"
 #include "queue_family.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct DestinationBuffer: public BaseBuffer
@@ -51,4 +51,4 @@ struct DestinationBuffer: public BaseBuffer
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_DESTINATION_BUFFER_H */
+#endif /* BLU_CAT_GRA_DESTINATION_BUFFER_H */
diff --git a/src/blucat/device.cpp b/src/blu_cat/gra/device.cpp
index cf21fa4..b2d114a 100644
--- a/src/blucat/device.cpp
+++ b/src/blu_cat/gra/device.cpp
@@ -23,7 +23,7 @@
 #include <sstream>
 #endif
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 
 namespace
 {
@@ -61,7 +61,7 @@ create_shader_module(VkDevice vk_device, const char *filename)
 }
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 Device::Device(VkPhysicalDevice vk_physical_device, bool with_swapchain)
@@ -98,7 +98,7 @@ Device::Device(VkPhysicalDevice vk_physical_device, bool with_swapchain)
     message << "Device ID: " << physical_properties.deviceID << std::endl;
     message << "Device type: " << physical_properties.deviceType <<
       std::endl;
-    cg_core.log.message(Log::Level::Trace, message.str());
+    BluCat::INT::core.log.message(Log::Level::Trace, message.str());
 #endif
 
     std::vector<VkDeviceQueueCreateInfo> device_queue_create_infos;
@@ -300,7 +300,8 @@ Device::Device(VkPhysicalDevice vk_physical_device, bool with_swapchain)
     // Select families with presentation support.
     VkBool32 present_supported;
     vkGetPhysicalDeviceSurfaceSupportKHR(
-      vk_physical_device, i, cg_core.window_surface, &present_supported);
+      vk_physical_device, i, BluCat::INT::core.window_surface,
+			&present_supported);
     if(present_supported)
       this->queue_families_with_presentation.push_back(
 	&this->queue_families[i]);
@@ -371,7 +372,7 @@ Device::get_queue_family_with_graphics() const
   */
   std::uniform_int_distribution<std::size_t> random_distribution{
     0, this->queue_families_with_graphics.size() -1};
-  auto random = random_distribution(random_number_generator);
+  auto random = random_distribution(INT::random_number_generator);
   return this->queue_families_with_graphics[0];
 }
 
@@ -385,7 +386,7 @@ Device::get_queue_family_with_presentation() const
   */
   std::uniform_int_distribution<std::size_t> random_distribution{
     0, this->queue_families_with_presentation.size() -1};
-  auto random = random_distribution(random_number_generator);
+  auto random = random_distribution(INT::random_number_generator);
   return this->queue_families_with_presentation[0];
 }
 
diff --git a/src/blucat/device.hpp b/src/blu_cat/gra/device.hpp
index bcfca4d..fd53198 100644
--- a/src/blucat/device.hpp
+++ b/src/blu_cat/gra/device.hpp
@@ -14,16 +14,16 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_DEVICE_H
-#define CANDY_GEAR_BLUCAT_DEVICE_H 1
+#ifndef BLU_CAT_GRA_DEVICE_H
+#define BLU_CAT_GRA_DEVICE_H 1
 
 #include <cstdlib>
 #include <vector>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "queue_family.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct Device
@@ -66,4 +66,4 @@ public:
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_DEVICE_H */
+#endif /* BLU_CAT_GRA_DEVICE_H */
diff --git a/src/blucat/font.cpp b/src/blu_cat/gra/font.cpp
index 4195b57..a9c2074 100644
--- a/src/blucat/font.cpp
+++ b/src/blu_cat/gra/font.cpp
@@ -16,15 +16,16 @@
 
 #include "font.hpp"
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 Font::Font(const char* font_path, int font_size)
 {
   FT_Error error;
-  error = FT_New_Face(cg_core.font_library, font_path, 0, &this->face);
+  error = FT_New_Face(
+		BluCat::INT::core.font_library, font_path, 0, &this->face);
   if(error == FT_Err_Unknown_File_Format) throw std::invalid_argument(
     "The font file could be opened and read, but it appears that its font "
     "format is unsupported.");
diff --git a/src/blucat/font.hpp b/src/blu_cat/gra/font.hpp
index 1b9be69..72ec6d3 100644
--- a/src/blucat/font.hpp
+++ b/src/blu_cat/gra/font.hpp
@@ -14,15 +14,15 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_FONT_H
-#define CANDY_GEAR_BLUCAT_FONT_H 1
+#ifndef BLU_CAT_GRA_FONT_H
+#define BLU_CAT_GRA_FONT_H 1
 
 #include <memory>
 #include <unordered_map>
 
 #include "character.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct Font
@@ -39,4 +39,4 @@ struct Font
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_FONT_H */
+#endif /* BLU_CAT_GRA_FONT_H */
diff --git a/src/blucat/framebuffer.cpp b/src/blu_cat/gra/framebuffer.cpp
index e761ff2..e2d0b7c 100644
--- a/src/blucat/framebuffer.cpp
+++ b/src/blu_cat/gra/framebuffer.cpp
@@ -16,7 +16,8 @@
 
 #include "framebuffer.hpp"
 
-#include "../core.hpp"
+#include "../com/command.hpp"
+#include "../int/core.hpp"
 #include "image.hpp"
 
 namespace
@@ -24,17 +25,17 @@ namespace
 void
 load_depth_image(void *obj)
 {
-  auto self = static_cast<BluCat::Framebuffer*>(obj);
+  auto self = static_cast<BluCat::GRA::Framebuffer*>(obj);
 
   VkExtent3D extent3d{};
-  extent3d.width = cg_core.display_width;
-  extent3d.height = cg_core.display_height;
+  extent3d.width = BluCat::INT::core.display_width;
+  extent3d.height = BluCat::INT::core.display_height;
   extent3d.depth = 1;
 
   try
   {
-    BluCat::Image::create(
-      cg_core.vk_device_with_swapchain,
+    BluCat::GRA::Image::create(
+      BluCat::INT::core.vk_device_with_swapchain,
       &self->depth_image,
       &self->depth_image_memory,
       VK_FORMAT_D32_SFLOAT,
@@ -44,7 +45,7 @@ load_depth_image(void *obj)
       VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT
       );
   }
-  catch(BluCat::Image::Error error)
+  catch(BluCat::GRA::Image::Error error)
   {
     std::string error_message{"Failed to create depth image → "};
     error_message += error.what();
@@ -55,29 +56,29 @@ load_depth_image(void *obj)
 void
 unload_depth_image(void *obj)
 {
-  auto self = static_cast<BluCat::Framebuffer*>(obj);
+  auto self = static_cast<BluCat::GRA::Framebuffer*>(obj);
 
   vkDestroyImage(
-    cg_core.vk_device_with_swapchain->device, self->depth_image,
+    BluCat::INT::core.vk_device_with_swapchain->device, self->depth_image,
     nullptr);
   vkFreeMemory(
-    cg_core.vk_device_with_swapchain->device,
+    BluCat::INT::core.vk_device_with_swapchain->device,
     self->depth_image_memory, nullptr);
 }
 
 void
 load_depth_image_view(void *obj)
 {
-  auto self = static_cast<BluCat::Framebuffer*>(obj);
+  auto self = static_cast<BluCat::GRA::Framebuffer*>(obj);
 
   try
   {
-    BluCat::Image::create_view(
-      cg_core.vk_device_with_swapchain, &self->depth_image_view,
+    BluCat::GRA::Image::create_view(
+      BluCat::INT::core.vk_device_with_swapchain, &self->depth_image_view,
       self->depth_image,
       VK_FORMAT_D32_SFLOAT, VK_IMAGE_ASPECT_DEPTH_BIT);
   }
-  catch(BluCat::Image::Error error)
+  catch(BluCat::GRA::Image::Error error)
   {
     std::string error_message{"Failed to create depth image view → "};
     error_message += error.what();
@@ -88,37 +89,38 @@ load_depth_image_view(void *obj)
 void
 unload_depth_image_view(void *obj)
 {
-  auto self = static_cast<BluCat::Framebuffer*>(obj);
+  auto self = static_cast<BluCat::GRA::Framebuffer*>(obj);
 
   vkDestroyImageView(
-    cg_core.vk_device_with_swapchain->device, self->depth_image_view, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->depth_image_view,
+		nullptr);
 }
 
 void
 load_3d(void *obj)
 {
-  auto self = static_cast<BluCat::Framebuffer*>(obj);
+  auto self = static_cast<BluCat::GRA::Framebuffer*>(obj);
 
-  self->pipeline_3d.resize(cg_core.vk_swapchain->images_count);
-  for (auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+  self->pipeline_3d.resize(BluCat::INT::core.vk_swapchain->images_count);
+  for (auto i{0}; i < BluCat::INT::core.vk_swapchain->images_count; i++)
   {
     std::array<VkImageView, 2> attachments = {
-      cg_core.vk_swapchain->image_views[i],
+      BluCat::INT::core.vk_swapchain->image_views[i],
       self->depth_image_view
     };
 
     VkFramebufferCreateInfo framebuffer_info{};
     framebuffer_info.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
-    framebuffer_info.renderPass = cg_core.vk_render_pass->pipeline_3d;
+    framebuffer_info.renderPass = BluCat::INT::core.vk_render_pass->pipeline_3d;
     framebuffer_info.attachmentCount = attachments.size();
     framebuffer_info.pAttachments = attachments.data();
-    framebuffer_info.width = cg_core.display_width;
-    framebuffer_info.height = cg_core.display_height;
+    framebuffer_info.width = BluCat::INT::core.display_width;
+    framebuffer_info.height = BluCat::INT::core.display_height;
 
     framebuffer_info.layers = 1;
 
     if(vkCreateFramebuffer(
-	 cg_core.vk_device_with_swapchain->device, &framebuffer_info, nullptr,
+	 BluCat::INT::core.vk_device_with_swapchain->device, &framebuffer_info, nullptr,
 	 &self->pipeline_3d[i]) != VK_SUCCESS)
       throw CommandError{"Failed to create Vulkan Framebuffer."};
   }
@@ -127,37 +129,37 @@ load_3d(void *obj)
 void
 unload_3d(void *obj)
 {
-  auto self = static_cast<BluCat::Framebuffer*>(obj);
+  auto self = static_cast<BluCat::GRA::Framebuffer*>(obj);
 
   for(auto framebuffer: self->pipeline_3d)
     vkDestroyFramebuffer(
-      cg_core.vk_device_with_swapchain->device, framebuffer, nullptr);
+      BluCat::INT::core.vk_device_with_swapchain->device, framebuffer, nullptr);
 }
 
 void
 load_2d(void *obj)
 {
-  auto self = static_cast<BluCat::Framebuffer*>(obj);
+  auto self = static_cast<BluCat::GRA::Framebuffer*>(obj);
 
-  self->pipeline_2d.resize(cg_core.vk_swapchain->images_count);
-  for (auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+  self->pipeline_2d.resize(BluCat::INT::core.vk_swapchain->images_count);
+  for (auto i{0}; i < BluCat::INT::core.vk_swapchain->images_count; i++)
   {
     std::array<VkImageView, 1> attachments = {
-      cg_core.vk_swapchain->image_views[i]
+      BluCat::INT::core.vk_swapchain->image_views[i]
     };
 
     VkFramebufferCreateInfo framebuffer_info{};
     framebuffer_info.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
-    framebuffer_info.renderPass = cg_core.vk_render_pass->pipeline_2d;
+    framebuffer_info.renderPass = BluCat::INT::core.vk_render_pass->pipeline_2d;
     framebuffer_info.attachmentCount = attachments.size();
     framebuffer_info.pAttachments = attachments.data();
-    framebuffer_info.width = cg_core.display_width;
-    framebuffer_info.height = cg_core.display_height;
+    framebuffer_info.width = BluCat::INT::core.display_width;
+    framebuffer_info.height = BluCat::INT::core.display_height;
     framebuffer_info.layers = 1;
 
     if(vkCreateFramebuffer(
-         cg_core.vk_device_with_swapchain->device, &framebuffer_info, nullptr,
-         &self->pipeline_2d[i])
+         BluCat::INT::core.vk_device_with_swapchain->device, &framebuffer_info,
+				 nullptr, &self->pipeline_2d[i])
        != VK_SUCCESS)
       throw CommandError{"Failed to create Vulkan Framebuffer."};
   }
@@ -166,11 +168,11 @@ load_2d(void *obj)
 void
 unload_2d(void *obj)
 {
-  auto self = static_cast<BluCat::Framebuffer*>(obj);
+  auto self = static_cast<BluCat::GRA::Framebuffer*>(obj);
 
   for(auto framebuffer: self->pipeline_2d)
     vkDestroyFramebuffer(
-      cg_core.vk_device_with_swapchain->device, framebuffer, nullptr);
+      BluCat::INT::core.vk_device_with_swapchain->device, framebuffer, nullptr);
 }
 
 const CommandChain loader{
@@ -182,7 +184,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 Framebuffer::Framebuffer()
diff --git a/src/blucat/framebuffer.hpp b/src/blu_cat/gra/framebuffer.hpp
index 32968a6..ddbf5c4 100644
--- a/src/blucat/framebuffer.hpp
+++ b/src/blu_cat/gra/framebuffer.hpp
@@ -14,14 +14,14 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_FRAMEBUFFER_H
-#define CANDY_GEAR_BLUCAT_FRAMEBUFFER_H 1
+#ifndef BLU_CAT_GRA_FRAMEBUFFER_H
+#define BLU_CAT_GRA_FRAMEBUFFER_H 1
 
 #include <vector>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct Framebuffer
@@ -40,4 +40,4 @@ struct Framebuffer
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_FRAMEBUFFER_H */
+#endif /* BLU_CAT_GRA_FRAMEBUFFER_H */
diff --git a/src/blucat/graphics_pipeline_2d_solid.cpp b/src/blu_cat/gra/graphics_pipeline_2d_solid.cpp
index 28b19b6..05dcbe1 100644
--- a/src/blucat/graphics_pipeline_2d_solid.cpp
+++ b/src/blu_cat/gra/graphics_pipeline_2d_solid.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,7 +18,7 @@
 
 #include <array>
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 #include "sprite.hpp"
 #include "uniform_data_object.hpp"
 
@@ -28,7 +28,7 @@ namespace
 void
 load_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline2DSolid*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline2DSolid*>(obj);
 
   VkPipelineShaderStageCreateInfo vert_shader_stage_info{};
   vert_shader_stage_info.sType =
@@ -37,7 +37,7 @@ load_pipeline(void *obj)
   vert_shader_stage_info.flags = 0;
   vert_shader_stage_info.stage = VK_SHADER_STAGE_VERTEX_BIT;
   vert_shader_stage_info.module =
-    cg_core.vk_device_with_swapchain->vert2d_solid_shader_module;
+    BluCat::INT::core.vk_device_with_swapchain->vert2d_solid_shader_module;
   vert_shader_stage_info.pName = "main";
   vert_shader_stage_info.pSpecializationInfo = nullptr;
 
@@ -48,7 +48,7 @@ load_pipeline(void *obj)
   frag_shader_stage_info.flags = 0;
   frag_shader_stage_info.stage = VK_SHADER_STAGE_FRAGMENT_BIT;
   frag_shader_stage_info.module =
-    cg_core.vk_device_with_swapchain->frag2d_solid_shader_module;
+    BluCat::INT::core.vk_device_with_swapchain->frag2d_solid_shader_module;
   frag_shader_stage_info.pName = "main";
   frag_shader_stage_info.pSpecializationInfo = nullptr;
 
@@ -91,14 +91,14 @@ load_pipeline(void *obj)
   VkViewport viewport = {};
   viewport.x = 0;
   viewport.y = 0;
-  viewport.width = cg_core.display_width;
-  viewport.height = cg_core.display_height;
+  viewport.width = BluCat::INT::core.display_width;
+  viewport.height = BluCat::INT::core.display_height;
   viewport.minDepth = 0.0f;
   viewport.maxDepth = 1.0f;
 
   VkRect2D scissor = {};
   scissor.offset = {0, 0};
-  scissor.extent = {cg_core.display_width, cg_core.display_height};
+  scissor.extent = {BluCat::INT::core.display_width, BluCat::INT::core.display_height};
 
   VkPipelineViewportStateCreateInfo viewport_state = {};
   viewport_state.sType =
@@ -191,14 +191,14 @@ load_pipeline(void *obj)
   pipeline_info.pColorBlendState = &color_blending;
   pipeline_info.pDynamicState = &dynamic_state_info;
   pipeline_info.layout =
-    cg_core.vk_graphics_pipeline_2d_solid_layout->pipeline;
-  pipeline_info.renderPass = cg_core.vk_render_pass->pipeline_2d;
+    BluCat::INT::core.vk_graphics_pipeline_2d_solid_layout->pipeline;
+  pipeline_info.renderPass = BluCat::INT::core.vk_render_pass->pipeline_2d;
   pipeline_info.subpass = 0;
   pipeline_info.basePipelineHandle = VK_NULL_HANDLE;
   pipeline_info.basePipelineIndex = -1;
 
   if(vkCreateGraphicsPipelines(
-       cg_core.vk_device_with_swapchain->device, VK_NULL_HANDLE, 1,
+       BluCat::INT::core.vk_device_with_swapchain->device, VK_NULL_HANDLE, 1,
        &pipeline_info, nullptr, &self->graphic_pipeline)
      != VK_SUCCESS)
     throw CommandError{"Failed to create graphics pipeline."};
@@ -207,10 +207,11 @@ load_pipeline(void *obj)
 void
 unload_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline2DSolid*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline2DSolid*>(obj);
 
   vkDestroyPipeline(
-    cg_core.vk_device_with_swapchain->device, self->graphic_pipeline, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->graphic_pipeline,
+		nullptr);
 }
 
 const CommandChain loader{
@@ -219,7 +220,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 GraphicsPipeline2DSolid::GraphicsPipeline2DSolid()
@@ -234,26 +235,25 @@ GraphicsPipeline2DSolid::~GraphicsPipeline2DSolid()
 
 void
 GraphicsPipeline2DSolid::draw(
-  std::shared_ptr<View2D> view, const VkCommandBuffer draw_command_buffer,
-  const size_t current_frame, const size_t next_frame,
-  const uint32_t image_index)
+  const VkCommandBuffer draw_command_buffer, const size_t current_frame,
+	const size_t next_frame, const uint32_t image_index)
 {
   // TODO set viewport just once per view, not once per pipeline.
   { // Set viewport
     VkViewport vk_viewport{};
-    vk_viewport.x = view->region.x;
-    vk_viewport.y = view->region.y;
-    vk_viewport.width = view->region.z;
-    vk_viewport.height = view->region.w;
+    vk_viewport.x = 0;
+    vk_viewport.y = 0;
+    vk_viewport.width = static_cast<float>(BluCat::INT::core.display_width);
+    vk_viewport.height = static_cast<float>(BluCat::INT::core.display_height);
     vk_viewport.minDepth = 0.0f;
     vk_viewport.maxDepth = 1.0f;
     vkCmdSetViewport(draw_command_buffer, 0, 1, &vk_viewport);
 
     VkRect2D vk_scissor{};
-    vk_scissor.offset.x = static_cast<int32_t>(view->region.x);
-    vk_scissor.offset.y = static_cast<int32_t>(view->region.y);
-    vk_scissor.extent.width = static_cast<uint32_t>(view->region.z);
-    vk_scissor.extent.height = static_cast<uint32_t>(view->region.w);
+    vk_scissor.offset.x = 0;
+    vk_scissor.offset.y = 0;
+    vk_scissor.extent.width = BluCat::INT::core.display_width;
+    vk_scissor.extent.height = BluCat::INT::core.display_height;
     vkCmdSetScissor(draw_command_buffer, 0, 1, &vk_scissor);
   }
 
@@ -263,20 +263,23 @@ GraphicsPipeline2DSolid::draw(
 
   // FIXME: I know sorting is expensive, but I need to figure out better what
   // to do here.
-  std::sort(view->sprites_to_draw[current_frame].begin(),
-            view->sprites_to_draw[current_frame].end());
+  std::sort(BluCat::INT::core.vk_renderer->sprites_to_draw[
+							current_frame].begin(),
+            BluCat::INT::core.vk_renderer->sprites_to_draw[
+							current_frame].end());
 
   // Draw sprites
-  for(auto& sprite_to_draw: view->sprites_to_draw[current_frame])
+  for(auto& sprite_to_draw:
+				BluCat::INT::core.vk_renderer->sprites_to_draw[current_frame])
   {
     std::array<VkDescriptorSet, 2> vk_descriptor_sets{
-      view->descriptor_sets_2d[image_index],
+      BluCat::INT::core.vk_renderer->descriptor_sets_2d[image_index],
       sprite_to_draw.sprite->texture->descriptor_sets[image_index]};
     VkDeviceSize offsets[]{0};
 
     vkCmdBindDescriptorSets(
       draw_command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
-      cg_core.vk_graphics_pipeline_2d_solid_layout->pipeline, 0,
+      INT::core.vk_graphics_pipeline_2d_solid_layout->pipeline, 0,
       vk_descriptor_sets.size(), vk_descriptor_sets.data(), 0, nullptr);
     vkCmdBindVertexBuffers(
       draw_command_buffer, 0, 1, &sprite_to_draw.sprite->vertex_buffer->buffer,
@@ -285,13 +288,13 @@ GraphicsPipeline2DSolid::draw(
     UDOVector4D position{sprite_to_draw.position};
     vkCmdPushConstants(
       draw_command_buffer,
-      cg_core.vk_graphics_pipeline_2d_solid_layout->pipeline,
+      INT::core.vk_graphics_pipeline_2d_solid_layout->pipeline,
       VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(UDOVector4D), &position);
     vkCmdDraw(draw_command_buffer, Sprite::vertex_count, 1, 0, 0);
   }
 
   // Prepare for the next frame.
-  view->sprites_to_draw[next_frame].clear();
+  BluCat::INT::core.vk_renderer->sprites_to_draw[next_frame].clear();
 }
 
 }
diff --git a/src/blucat/graphics_pipeline_2d_solid.hpp b/src/blu_cat/gra/graphics_pipeline_2d_solid.hpp
index eae54ae..c2d85d5 100644
--- a/src/blucat/graphics_pipeline_2d_solid.hpp
+++ b/src/blu_cat/gra/graphics_pipeline_2d_solid.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,16 +14,15 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_2D_SOLID_H
-#define CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_2D_SOLID_H 1
+#ifndef BLU_CAT_GRA_GRAPHICS_PIPELINE_2D_SOLID_H
+#define BLU_CAT_GRA_GRAPHICS_PIPELINE_2D_SOLID_H 1
 
 #include <memory>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "command_pool.hpp"
-#include "view_2d.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct GraphicsPipeline2DSolid
@@ -34,11 +33,10 @@ struct GraphicsPipeline2DSolid
   ~GraphicsPipeline2DSolid();
 
   void
-  draw(std::shared_ptr<View2D> view, const VkCommandBuffer draw_command_buffer,
-       const size_t current_frame, const size_t next_frame,
-       const uint32_t image_index);
+  draw(const VkCommandBuffer draw_command_buffer, const size_t current_frame,
+			 const size_t next_frame, const uint32_t image_index);
 };
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_2D_SOLID_H */
+#endif /* BLU_CAT_GRA_GRAPHICS_PIPELINE_2D_SOLID_H */
diff --git a/src/blucat/graphics_pipeline_2d_solid_layout.cpp b/src/blu_cat/gra/graphics_pipeline_2d_solid_layout.cpp
index 7b537a2..476bac1 100644
--- a/src/blucat/graphics_pipeline_2d_solid_layout.cpp
+++ b/src/blu_cat/gra/graphics_pipeline_2d_solid_layout.cpp
@@ -18,7 +18,7 @@
 
 #include <array>
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 #include "uniform_data_object.hpp"
 
 namespace
@@ -27,17 +27,17 @@ namespace
 void
 load_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline2DSolidLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline2DSolidLayout*>(obj);
 
   std::array<VkDescriptorSetLayout, 2> set_layouts{
-    cg_core.vk_descriptor_set_layout->view,
-    cg_core.vk_descriptor_set_layout->texture
+    BluCat::INT::core.vk_descriptor_set_layout->view,
+    BluCat::INT::core.vk_descriptor_set_layout->texture
   };
 
   std::array<VkPushConstantRange, 1> push_constants;
   push_constants[0].stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
   push_constants[0].offset = 0;
-  push_constants[0].size = sizeof(BluCat::UDOVector4D);
+  push_constants[0].size = sizeof(BluCat::GRA::UDOVector4D);
 
   VkPipelineLayoutCreateInfo pipeline_layout_info{};
   pipeline_layout_info.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
@@ -47,7 +47,7 @@ load_pipeline(void *obj)
   pipeline_layout_info.pPushConstantRanges = push_constants.data();
 
   if(vkCreatePipelineLayout(
-       cg_core.vk_device_with_swapchain->device, &pipeline_layout_info,
+       BluCat::INT::core.vk_device_with_swapchain->device, &pipeline_layout_info,
        nullptr, &self->pipeline) != VK_SUCCESS)
     throw CommandError{"Failed to create Vulkan pipeline layout."};
 }
@@ -55,10 +55,10 @@ load_pipeline(void *obj)
 void
 unload_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline2DSolidLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline2DSolidLayout*>(obj);
 
   vkDestroyPipelineLayout(
-    cg_core.vk_device_with_swapchain->device, self->pipeline, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->pipeline, nullptr);
 }
 
 const CommandChain loader{
@@ -67,7 +67,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 GraphicsPipeline2DSolidLayout::GraphicsPipeline2DSolidLayout()
diff --git a/src/blucat/graphics_pipeline_2d_solid_layout.hpp b/src/blu_cat/gra/graphics_pipeline_2d_solid_layout.hpp
index 77172be..6abd65d 100644
--- a/src/blucat/graphics_pipeline_2d_solid_layout.hpp
+++ b/src/blu_cat/gra/graphics_pipeline_2d_solid_layout.hpp
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_2D_LAYOUT_H
-#define CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_2D_LAYOUT_H 1
+#ifndef BLU_CAT_GRA_GRAPHICS_PIPELINE_2D_LAYOUT_H
+#define BLU_CAT_GRA_GRAPHICS_PIPELINE_2D_LAYOUT_H 1
 
-#include "core.hpp"
+#include "vulkan.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct GraphicsPipeline2DSolidLayout
@@ -32,4 +32,4 @@ struct GraphicsPipeline2DSolidLayout
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_2D_LAYOUT_H */
+#endif /* BLU_CAT_GRA_GRAPHICS_PIPELINE_2D_LAYOUT_H */
diff --git a/src/blucat/graphics_pipeline_2d_wired.cpp b/src/blu_cat/gra/graphics_pipeline_2d_wired.cpp
index 192a9d6..1273c67 100644
--- a/src/blucat/graphics_pipeline_2d_wired.cpp
+++ b/src/blu_cat/gra/graphics_pipeline_2d_wired.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,7 +18,7 @@
 
 #include <array>
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 #include "rectangle.hpp"
 #include "sprite.hpp"
 #include "uniform_data_object.hpp"
@@ -29,17 +29,17 @@ namespace
 void
 load_indexes(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline2DWired*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline2DWired*>(obj);
 
   self->queue_family =
-    cg_core.vk_device_with_swapchain->get_queue_family_with_graphics();
+    BluCat::INT::core.vk_device_with_swapchain->get_queue_family_with_graphics();
 
   std::array<uint32_t, 4> indexes{0, 1, 2, 3};
   void *indexes_data{indexes.data()};
   size_t indexes_size{sizeof(indexes[0]) * indexes.size()};
-  BluCat::SourceBuffer source_index_buffer{
+  BluCat::GRA::SourceBuffer source_index_buffer{
     self->queue_family->device, indexes_data, indexes_size};
-  self->index_buffer = new BluCat::DestinationBuffer{
+  self->index_buffer = new BluCat::GRA::DestinationBuffer{
     self->queue_family, &source_index_buffer,
     VK_BUFFER_USAGE_INDEX_BUFFER_BIT};
 }
@@ -47,7 +47,7 @@ load_indexes(void *obj)
 void
 unload_indexes(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline2DWired*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline2DWired*>(obj);
 
   delete self->index_buffer;
 }
@@ -55,7 +55,7 @@ unload_indexes(void *obj)
 void
 load_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline2DWired*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline2DWired*>(obj);
 
   VkPipelineShaderStageCreateInfo vert_shader_stage_info{};
   vert_shader_stage_info.sType =
@@ -64,7 +64,7 @@ load_pipeline(void *obj)
   vert_shader_stage_info.flags = 0;
   vert_shader_stage_info.stage = VK_SHADER_STAGE_VERTEX_BIT;
   vert_shader_stage_info.module =
-    cg_core.vk_device_with_swapchain->vert2d_wired_shader_module;
+    BluCat::INT::core.vk_device_with_swapchain->vert2d_wired_shader_module;
   vert_shader_stage_info.pName = "main";
   vert_shader_stage_info.pSpecializationInfo = nullptr;
 
@@ -75,7 +75,7 @@ load_pipeline(void *obj)
   frag_shader_stage_info.flags = 0;
   frag_shader_stage_info.stage = VK_SHADER_STAGE_FRAGMENT_BIT;
   frag_shader_stage_info.module =
-    cg_core.vk_device_with_swapchain->frag2d_wired_shader_module;
+    BluCat::INT::core.vk_device_with_swapchain->frag2d_wired_shader_module;
   frag_shader_stage_info.pName = "main";
   frag_shader_stage_info.pSpecializationInfo = nullptr;
 
@@ -105,14 +105,14 @@ load_pipeline(void *obj)
   VkViewport viewport = {};
   viewport.x = 0;
   viewport.y = 0;
-  viewport.width = cg_core.display_width;
-  viewport.height = cg_core.display_height;
+  viewport.width = BluCat::INT::core.display_width;
+  viewport.height = BluCat::INT::core.display_height;
   viewport.minDepth = 0.0f;
   viewport.maxDepth = 1.0f;
 
   VkRect2D scissor = {};
   scissor.offset = {0, 0};
-  scissor.extent = {cg_core.display_width, cg_core.display_height};
+  scissor.extent = {BluCat::INT::core.display_width, BluCat::INT::core.display_height};
 
   VkPipelineViewportStateCreateInfo viewport_state = {};
   viewport_state.sType =
@@ -203,14 +203,14 @@ load_pipeline(void *obj)
   pipeline_info.pColorBlendState = &color_blending;
   pipeline_info.pDynamicState = &dynamic_state_info;
   pipeline_info.layout =
-    cg_core.vk_graphics_pipeline_2d_wired_layout->pipeline;
-  pipeline_info.renderPass = cg_core.vk_render_pass->pipeline_2d;
+    BluCat::INT::core.vk_graphics_pipeline_2d_wired_layout->pipeline;
+  pipeline_info.renderPass = BluCat::INT::core.vk_render_pass->pipeline_2d;
   pipeline_info.subpass = 0;
   pipeline_info.basePipelineHandle = VK_NULL_HANDLE;
   pipeline_info.basePipelineIndex = -1;
 
   if(vkCreateGraphicsPipelines(
-       cg_core.vk_device_with_swapchain->device, VK_NULL_HANDLE, 1,
+       BluCat::INT::core.vk_device_with_swapchain->device, VK_NULL_HANDLE, 1,
        &pipeline_info, nullptr, &self->graphic_pipeline) != VK_SUCCESS)
     throw CommandError{"Failed to create graphics pipeline."};
 }
@@ -218,10 +218,11 @@ load_pipeline(void *obj)
 void
 unload_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline2DWired*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline2DWired*>(obj);
 
   vkDestroyPipeline(
-    cg_core.vk_device_with_swapchain->device, self->graphic_pipeline, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->graphic_pipeline,
+		nullptr);
 }
 
 const CommandChain loader{
@@ -231,7 +232,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 GraphicsPipeline2DWired::GraphicsPipeline2DWired()
@@ -246,38 +247,37 @@ GraphicsPipeline2DWired::~GraphicsPipeline2DWired()
 
 void
 GraphicsPipeline2DWired::draw(
-  std::shared_ptr<View2D> view, const VkCommandBuffer draw_command_buffer,
-  const size_t current_frame, const size_t next_frame,
-  const uint32_t image_index)
+  const VkCommandBuffer draw_command_buffer, const size_t current_frame,
+	const size_t next_frame, const uint32_t image_index)
 {
-  // Set viewport
-  {
+  // TODO set viewport just once per view, not once per pipeline.
+  { // Set viewport
     VkViewport vk_viewport{};
-    vk_viewport.x = view->region.x;
-    vk_viewport.y = view->region.y;
-    vk_viewport.width = view->region.z;
-    vk_viewport.height = view->region.w;
+    vk_viewport.x = 0;
+    vk_viewport.y = 0;
+    vk_viewport.width = static_cast<float>(BluCat::INT::core.display_width);
+    vk_viewport.height = static_cast<float>(BluCat::INT::core.display_height);
     vk_viewport.minDepth = 0.0f;
     vk_viewport.maxDepth = 1.0f;
     vkCmdSetViewport(draw_command_buffer, 0, 1, &vk_viewport);
 
     VkRect2D vk_scissor{};
-    vk_scissor.offset.x = static_cast<int32_t>(view->region.x);
-    vk_scissor.offset.y = static_cast<int32_t>(view->region.y);
-    vk_scissor.extent.width = static_cast<uint32_t>(view->region.z);
-    vk_scissor.extent.height = static_cast<uint32_t>(view->region.w);
+    vk_scissor.offset.x = 0;
+    vk_scissor.offset.y = 0;
+    vk_scissor.extent.width = BluCat::INT::core.display_width;
+    vk_scissor.extent.height = BluCat::INT::core.display_height;
     vkCmdSetScissor(draw_command_buffer, 0, 1, &vk_scissor);
   }
 
   // Draw rectangles
   {
     std::array<VkDescriptorSet, 1> vk_descriptor_sets{
-      view->descriptor_sets_2d[image_index]};
+      BluCat::INT::core.vk_renderer->descriptor_sets_2d[image_index]};
     VkDeviceSize offsets[]{0};
 
     vkCmdBindDescriptorSets(
       draw_command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
-      cg_core.vk_graphics_pipeline_2d_wired_layout->pipeline, 0,
+      INT::core.vk_graphics_pipeline_2d_wired_layout->pipeline, 0,
       vk_descriptor_sets.size(), vk_descriptor_sets.data(), 0, nullptr);
     vkCmdBindPipeline(
       draw_command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
@@ -286,19 +286,21 @@ GraphicsPipeline2DWired::draw(
       draw_command_buffer, this->index_buffer->buffer, 0,
       VK_INDEX_TYPE_UINT32);
 
-    for(auto i{0}; i < view->rectangles_to_draw[current_frame].size(); i++)
+    for(auto i{0}; i < BluCat::INT::core.vk_renderer->rectangles_to_draw[
+					current_frame].size(); i++)
     {
-      auto &rect{view->rectangles_to_draw[current_frame][i]};
+      auto &rect{BluCat::INT::core.vk_renderer->rectangles_to_draw[
+					current_frame][i]};
 
       UDOVector4D position{rect.position};
       UDOVector3D color{rect.color};
       vkCmdPushConstants(
         draw_command_buffer,
-        cg_core.vk_graphics_pipeline_2d_wired_layout->pipeline,
+        INT::core.vk_graphics_pipeline_2d_wired_layout->pipeline,
         VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(UDOVector4D), &position);
       vkCmdPushConstants(
         draw_command_buffer,
-        cg_core.vk_graphics_pipeline_2d_wired_layout->pipeline,
+        INT::core.vk_graphics_pipeline_2d_wired_layout->pipeline,
         VK_SHADER_STAGE_FRAGMENT_BIT, sizeof(UDOVector4D), sizeof(UDOVector3D),
         &color);
       vkCmdDrawIndexed(
@@ -307,7 +309,7 @@ GraphicsPipeline2DWired::draw(
   }
 
   // Prepare for the next frame.
-  view->rectangles_to_draw[next_frame].clear();
+  BluCat::INT::core.vk_renderer->rectangles_to_draw[next_frame].clear();
 }
 
 }
diff --git a/src/blucat/graphics_pipeline_2d_wired.hpp b/src/blu_cat/gra/graphics_pipeline_2d_wired.hpp
index 32d965b..9fc46c4 100644
--- a/src/blucat/graphics_pipeline_2d_wired.hpp
+++ b/src/blu_cat/gra/graphics_pipeline_2d_wired.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,15 +14,16 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_2D_WIRED_H
-#define CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_2D_WIRED_H 1
+#ifndef BLU_CAT_GRA_GRAPHICS_PIPELINE_2D_WIRED_H
+#define BLU_CAT_GRA_GRAPHICS_PIPELINE_2D_WIRED_H 1
 
 #include <memory>
 
-#include "core.hpp"
-#include "view_2d.hpp"
+#include "vulkan.hpp"
+#include "command_pool.hpp"
+#include "destination_buffer.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct GraphicsPipeline2DWired
@@ -37,11 +38,10 @@ struct GraphicsPipeline2DWired
   ~GraphicsPipeline2DWired();
 
   void
-  draw(std::shared_ptr<View2D> view, const VkCommandBuffer draw_command_buffer,
-       const size_t current_frame, const size_t next_frame,
-       const uint32_t image_index);
+  draw(const VkCommandBuffer draw_command_buffer, const size_t current_frame,
+			 const size_t next_frame, const uint32_t image_index);
 };
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_2D_WIRED_H */
+#endif /* BLU_CAT_GRA_GRAPHICS_PIPELINE_2D_WIRED_H */
diff --git a/src/blucat/graphics_pipeline_2d_wired_layout.cpp b/src/blu_cat/gra/graphics_pipeline_2d_wired_layout.cpp
index eaa6af7..431a845 100644
--- a/src/blucat/graphics_pipeline_2d_wired_layout.cpp
+++ b/src/blu_cat/gra/graphics_pipeline_2d_wired_layout.cpp
@@ -18,7 +18,7 @@
 
 #include <array>
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 #include "graphics_pipeline_2d_solid_layout.hpp"
 #include "uniform_data_object.hpp"
 
@@ -28,20 +28,20 @@ namespace
 void
 load_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline2DWiredLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline2DWiredLayout*>(obj);
 
   std::array<VkDescriptorSetLayout, 1> set_layouts{
-    cg_core.vk_descriptor_set_layout->view
+    BluCat::INT::core.vk_descriptor_set_layout->view
   };
 
   std::array<VkPushConstantRange, 2> push_constants;
   push_constants[0].stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
   push_constants[0].offset = 0;
-  push_constants[0].size = sizeof(BluCat::UDOVector4D);
+  push_constants[0].size = sizeof(BluCat::GRA::UDOVector4D);
 
   push_constants[1].stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT;
-  push_constants[1].offset = sizeof(BluCat::UDOVector4D);
-  push_constants[1].size = sizeof(BluCat::UDOVector3D);
+  push_constants[1].offset = sizeof(BluCat::GRA::UDOVector4D);
+  push_constants[1].size = sizeof(BluCat::GRA::UDOVector3D);
 
   VkPipelineLayoutCreateInfo pipeline_layout_info{};
   pipeline_layout_info.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
@@ -51,7 +51,7 @@ load_pipeline(void *obj)
   pipeline_layout_info.pPushConstantRanges = push_constants.data();
 
   if(vkCreatePipelineLayout(
-       cg_core.vk_device_with_swapchain->device, &pipeline_layout_info,
+       BluCat::INT::core.vk_device_with_swapchain->device, &pipeline_layout_info,
        nullptr, &self->pipeline) != VK_SUCCESS)
     throw CommandError{"Failed to create Vulkan pipeline layout."};
 }
@@ -59,10 +59,10 @@ load_pipeline(void *obj)
 void
 unload_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline2DWiredLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline2DWiredLayout*>(obj);
 
   vkDestroyPipelineLayout(
-    cg_core.vk_device_with_swapchain->device, self->pipeline, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->pipeline, nullptr);
 }
 
 const CommandChain loader{
@@ -71,7 +71,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 GraphicsPipeline2DWiredLayout::GraphicsPipeline2DWiredLayout()
diff --git a/src/blucat/graphics_pipeline_2d_wired_layout.hpp b/src/blu_cat/gra/graphics_pipeline_2d_wired_layout.hpp
index d447230..16f23ea 100644
--- a/src/blucat/graphics_pipeline_2d_wired_layout.hpp
+++ b/src/blu_cat/gra/graphics_pipeline_2d_wired_layout.hpp
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_2D_WIRED_LAYOUT_H
-#define CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_2D_WIRED_LAYOUT_H 1
+#ifndef BLU_CAT_GRA_GRAPHICS_PIPELINE_2D_WIRED_LAYOUT_H
+#define BLU_CAT_GRA_GRAPHICS_PIPELINE_2D_WIRED_LAYOUT_H 1
 
-#include "core.hpp"
+#include "vulkan.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct GraphicsPipeline2DWiredLayout
@@ -32,4 +32,4 @@ struct GraphicsPipeline2DWiredLayout
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_2D_LAYOUT_H */
+#endif /* BLU_CAT_GRA_GRAPHICS_PIPELINE_2D_LAYOUT_H */
diff --git a/src/blucat/graphics_pipeline_3d.cpp b/src/blu_cat/gra/graphics_pipeline_3d.cpp
index c1b60a6..288e186 100644
--- a/src/blucat/graphics_pipeline_3d.cpp
+++ b/src/blu_cat/gra/graphics_pipeline_3d.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,8 +19,8 @@
 #include <array>
 #include <stdexcept>
 
-#include "../core.hpp"
-#include "core.hpp"
+#include "../int/core.hpp"
+#include "vulkan.hpp"
 #include "static_mesh_vertex.hpp"
 #include "uniform_data_object.hpp"
 
@@ -30,7 +30,7 @@ namespace
 void
 load_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline3D*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline3D*>(obj);
 
   VkPipelineShaderStageCreateInfo vert_shader_stage_info = {};
   vert_shader_stage_info.sType =
@@ -39,7 +39,7 @@ load_pipeline(void *obj)
   vert_shader_stage_info.flags = 0;
   vert_shader_stage_info.stage = VK_SHADER_STAGE_VERTEX_BIT;
   vert_shader_stage_info.module =
-    cg_core.vk_device_with_swapchain->vert3d_shader_module;
+    BluCat::INT::core.vk_device_with_swapchain->vert3d_shader_module;
   vert_shader_stage_info.pName = "main";
   vert_shader_stage_info.pSpecializationInfo = nullptr;
 
@@ -50,7 +50,7 @@ load_pipeline(void *obj)
   frag_shader_stage_info.flags = 0;
   frag_shader_stage_info.stage = VK_SHADER_STAGE_FRAGMENT_BIT;
   frag_shader_stage_info.module =
-    cg_core.vk_device_with_swapchain->frag3d_shader_module;
+    BluCat::INT::core.vk_device_with_swapchain->frag3d_shader_module;
   frag_shader_stage_info.pName = "main";
   frag_shader_stage_info.pSpecializationInfo = nullptr;
 
@@ -61,7 +61,7 @@ load_pipeline(void *obj)
 
   VkVertexInputBindingDescription vertex_input_binding{};
   vertex_input_binding.binding = 0;
-  vertex_input_binding.stride = sizeof(BluCat::StaticMeshVertex);
+  vertex_input_binding.stride = sizeof(BluCat::GRA::StaticMeshVertex);
   vertex_input_binding.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;
 
   std::array<VkVertexInputAttributeDescription, 3> vertex_attribute{};
@@ -69,17 +69,17 @@ load_pipeline(void *obj)
   vertex_attribute[0].location = 0;
   vertex_attribute[0].binding = 0;
   vertex_attribute[0].format = VK_FORMAT_R32G32B32_SFLOAT;
-  vertex_attribute[0].offset = offsetof(BluCat::StaticMeshVertex, position);
+  vertex_attribute[0].offset = offsetof(BluCat::GRA::StaticMeshVertex, position);
   // Normal.
   vertex_attribute[1].location = 1;
   vertex_attribute[1].binding = 0;
   vertex_attribute[1].format = VK_FORMAT_R32G32B32_SFLOAT;
-  vertex_attribute[1].offset = offsetof(BluCat::StaticMeshVertex, normal);
+  vertex_attribute[1].offset = offsetof(BluCat::GRA::StaticMeshVertex, normal);
   // Texture coordinate.
   vertex_attribute[2].location = 2;
   vertex_attribute[2].binding = 0;
   vertex_attribute[2].format = VK_FORMAT_R32G32_SFLOAT;
-  vertex_attribute[2].offset = offsetof(BluCat::StaticMeshVertex, texture_coord);
+  vertex_attribute[2].offset = offsetof(BluCat::GRA::StaticMeshVertex, texture_coord);
 
   VkPipelineVertexInputStateCreateInfo vertex_input_info = {};
   vertex_input_info.sType =
@@ -103,14 +103,14 @@ load_pipeline(void *obj)
   VkViewport viewport = {};
   viewport.x = 0;
   viewport.y = 0;
-  viewport.width = cg_core.display_width;
-  viewport.height = cg_core.display_height;
+  viewport.width = BluCat::INT::core.display_width;
+  viewport.height = BluCat::INT::core.display_height;
   viewport.minDepth = 0.0f;
   viewport.maxDepth = 1.0f;
 
   VkRect2D scissor = {};
   scissor.offset = {0, 0};
-  scissor.extent = {cg_core.display_width, cg_core.display_height};
+  scissor.extent = {BluCat::INT::core.display_width, BluCat::INT::core.display_height};
 
   VkPipelineViewportStateCreateInfo viewport_state = {};
   viewport_state.sType =
@@ -213,14 +213,14 @@ load_pipeline(void *obj)
   pipeline_info.pDepthStencilState = &depth_stencil;
   pipeline_info.pColorBlendState = &color_blending;
   pipeline_info.pDynamicState = &dynamic_state_info;
-  pipeline_info.layout = cg_core.vk_graphics_pipeline_3d_layout->pipeline;
-  pipeline_info.renderPass = cg_core.vk_render_pass->pipeline_3d;
+  pipeline_info.layout = BluCat::INT::core.vk_graphics_pipeline_3d_layout->pipeline;
+  pipeline_info.renderPass = BluCat::INT::core.vk_render_pass->pipeline_3d;
   pipeline_info.subpass = 0;
   pipeline_info.basePipelineHandle = VK_NULL_HANDLE;
   pipeline_info.basePipelineIndex = -1;
 
   if(vkCreateGraphicsPipelines(
-       cg_core.vk_device_with_swapchain->device, VK_NULL_HANDLE, 1,
+       BluCat::INT::core.vk_device_with_swapchain->device, VK_NULL_HANDLE, 1,
        &pipeline_info, nullptr, &self->graphic_pipeline)
      != VK_SUCCESS)
     throw CommandError{"Failed to create graphics pipeline."};
@@ -229,10 +229,11 @@ load_pipeline(void *obj)
 void
 unload_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline3D*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline3D*>(obj);
 
   vkDestroyPipeline(
-    cg_core.vk_device_with_swapchain->device, self->graphic_pipeline, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->graphic_pipeline,
+		nullptr);
 }
 
 const CommandChain loader{
@@ -241,7 +242,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 GraphicsPipeline3D::GraphicsPipeline3D()
@@ -256,7 +257,7 @@ GraphicsPipeline3D::~GraphicsPipeline3D()
 
 void
 GraphicsPipeline3D::draw(
-  std::shared_ptr<View3D> view, const VkCommandBuffer draw_command_buffer,
+  std::shared_ptr<View> view, const VkCommandBuffer draw_command_buffer,
   const size_t current_frame, const uint32_t image_index)
 {
   vkCmdBindPipeline(
@@ -265,7 +266,7 @@ GraphicsPipeline3D::draw(
 
   // Draw models
   for(auto& [static_mesh, instances]:
-	cg_core.vk_renderer->static_models_to_draw[current_frame])
+				INT::core.vk_renderer->static_models_to_draw[current_frame])
   {
       VkBuffer vertex_buffers[]{static_mesh->vertex_buffer->buffer};
       VkDeviceSize offsets[]{0};
@@ -284,20 +285,20 @@ GraphicsPipeline3D::draw(
 	glm::mat4 rotation_matrix{glm::toMat4(*instance->orientation)};
 
 	std::array<VkDescriptorSet, 4> vk_descriptor_sets{
-	  cg_core.vk_light->descriptor_sets_world[image_index],
-	  view->descriptor_sets_3d[image_index],
+	  INT::core.vk_light->descriptor_sets_world[image_index],
+	  view->descriptor_sets[image_index],
 	  instance->descriptor_sets[image_index],
 	  instance->texture->descriptor_sets[image_index]};
 
 	vkCmdBindDescriptorSets(
 	  draw_command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
-	  cg_core.vk_graphics_pipeline_3d_layout->pipeline, 0,
+	  INT::core.vk_graphics_pipeline_3d_layout->pipeline, 0,
 	  vk_descriptor_sets.size(), vk_descriptor_sets.data(), 0, nullptr);
 
         vkCmdDrawIndexed(
           draw_command_buffer, static_mesh->index_count, 1, 0, 0, 0);
 
-	BluCat::UDOStaticModel udo_static_model{};
+	BluCat::GRA::UDOStaticModel udo_static_model{};
 	udo_static_model.base_matrix = translation_matrix * rotation_matrix;
 	instance->uniform_buffers[image_index].copy_data(&udo_static_model);
       }
diff --git a/src/blucat/graphics_pipeline_3d.hpp b/src/blu_cat/gra/graphics_pipeline_3d.hpp
index de0c422..2e30e02 100644
--- a/src/blucat/graphics_pipeline_3d.hpp
+++ b/src/blu_cat/gra/graphics_pipeline_3d.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,16 +14,16 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_3D_H
-#define CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_3D_H 1
+#ifndef BLU_CAT_GRA_GRAPHICS_PIPELINE_3D_H
+#define BLU_CAT_GRA_GRAPHICS_PIPELINE_3D_H 1
 
 #include <memory>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "command_pool.hpp"
-#include "view_3d.hpp"
+#include "view.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct GraphicsPipeline3D
@@ -34,10 +34,10 @@ struct GraphicsPipeline3D
   ~GraphicsPipeline3D();
 
   void
-  draw(std::shared_ptr<View3D> view, const VkCommandBuffer draw_command_buffer,
+  draw(std::shared_ptr<View> view, const VkCommandBuffer draw_command_buffer,
        const size_t current_frame, const uint32_t image_index);
 };
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_3D_H */
+#endif /* BLU_CAT_GRA_GRAPHICS_PIPELINE_3D_H */
diff --git a/src/blucat/graphics_pipeline_3d_layout.cpp b/src/blu_cat/gra/graphics_pipeline_3d_layout.cpp
index b2a54d6..504b46e 100644
--- a/src/blucat/graphics_pipeline_3d_layout.cpp
+++ b/src/blu_cat/gra/graphics_pipeline_3d_layout.cpp
@@ -18,7 +18,7 @@
 
 #include <array>
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 #include "uniform_data_object.hpp"
 
 namespace
@@ -27,13 +27,13 @@ namespace
 void
 load_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline3DLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline3DLayout*>(obj);
 
   std::array<VkDescriptorSetLayout, 4> set_layouts{
-    cg_core.vk_descriptor_set_layout->world,
-    cg_core.vk_descriptor_set_layout->view,
-    cg_core.vk_descriptor_set_layout->model,
-    cg_core.vk_descriptor_set_layout->texture};
+    BluCat::INT::core.vk_descriptor_set_layout->world,
+    BluCat::INT::core.vk_descriptor_set_layout->view,
+    BluCat::INT::core.vk_descriptor_set_layout->model,
+    BluCat::INT::core.vk_descriptor_set_layout->texture};
 
   VkPipelineLayoutCreateInfo pipeline_layout_info{};
   pipeline_layout_info.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
@@ -43,7 +43,7 @@ load_pipeline(void *obj)
   pipeline_layout_info.pPushConstantRanges = nullptr;
 
   if(vkCreatePipelineLayout(
-       cg_core.vk_device_with_swapchain->device,
+       BluCat::INT::core.vk_device_with_swapchain->device,
        &pipeline_layout_info, nullptr, &self->pipeline) != VK_SUCCESS)
     throw CommandError{"Failed to create Vulkan pipeline layout."};
 }
@@ -51,10 +51,10 @@ load_pipeline(void *obj)
 void
 unload_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline3DLayout*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline3DLayout*>(obj);
 
   vkDestroyPipelineLayout(
-    cg_core.vk_device_with_swapchain->device, self->pipeline, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->pipeline, nullptr);
 }
 
 const CommandChain loader{
@@ -63,7 +63,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 GraphicsPipeline3DLayout::GraphicsPipeline3DLayout()
diff --git a/src/blucat/graphics_pipeline_3d_layout.hpp b/src/blu_cat/gra/graphics_pipeline_3d_layout.hpp
index 2b44dac..13820c4 100644
--- a/src/blucat/graphics_pipeline_3d_layout.hpp
+++ b/src/blu_cat/gra/graphics_pipeline_3d_layout.hpp
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_3D_LAYOUT_H
-#define CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_3D_LAYOUT_H 1
+#ifndef BLU_CAT_GRA_GRAPHICS_PIPELINE_3D_LAYOUT_H
+#define BLU_CAT_GRA_GRAPHICS_PIPELINE_3D_LAYOUT_H 1
 
-#include "core.hpp"
+#include "vulkan.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct GraphicsPipeline3DLayout
@@ -32,4 +32,4 @@ struct GraphicsPipeline3DLayout
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_3D_LAYOUT_H */
+#endif /* BLU_CAT_GRA_GRAPHICS_PIPELINE_3D_LAYOUT_H */
diff --git a/src/blucat/graphics_pipeline_3d_skeletal.cpp b/src/blu_cat/gra/graphics_pipeline_3d_skeletal.cpp
index b039c00..79a85f1 100644
--- a/src/blucat/graphics_pipeline_3d_skeletal.cpp
+++ b/src/blu_cat/gra/graphics_pipeline_3d_skeletal.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,8 +19,7 @@
 #include <array>
 #include <stdexcept>
 
-#include "../core.hpp"
-#include "core.hpp"
+#include "../int/core.hpp"
 #include "skeletal_mesh_vertex.hpp"
 #include "uniform_data_object.hpp"
 
@@ -30,7 +29,7 @@ namespace
 void
 load_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline3DSkeletal*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline3DSkeletal*>(obj);
 
   VkPipelineShaderStageCreateInfo vert_shader_stage_info = {};
   vert_shader_stage_info.sType =
@@ -39,7 +38,7 @@ load_pipeline(void *obj)
   vert_shader_stage_info.flags = 0;
   vert_shader_stage_info.stage = VK_SHADER_STAGE_VERTEX_BIT;
   vert_shader_stage_info.module =
-    cg_core.vk_device_with_swapchain->vert3d_skeletal_shader_module;
+    BluCat::INT::core.vk_device_with_swapchain->vert3d_skeletal_shader_module;
   vert_shader_stage_info.pName = "main";
   vert_shader_stage_info.pSpecializationInfo = nullptr;
 
@@ -50,7 +49,7 @@ load_pipeline(void *obj)
   frag_shader_stage_info.flags = 0;
   frag_shader_stage_info.stage = VK_SHADER_STAGE_FRAGMENT_BIT;
   frag_shader_stage_info.module =
-    cg_core.vk_device_with_swapchain->frag3d_shader_module;
+    BluCat::INT::core.vk_device_with_swapchain->frag3d_shader_module;
   frag_shader_stage_info.pName = "main";
   frag_shader_stage_info.pSpecializationInfo = nullptr;
 
@@ -61,7 +60,7 @@ load_pipeline(void *obj)
 
   VkVertexInputBindingDescription vertex_input_binding{};
   vertex_input_binding.binding = 0;
-  vertex_input_binding.stride = sizeof(BluCat::SkeletalMeshVertex);
+  vertex_input_binding.stride = sizeof(BluCat::GRA::SkeletalMeshVertex);
   vertex_input_binding.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;
 
   std::array<VkVertexInputAttributeDescription, 5> vertex_attribute{};
@@ -69,27 +68,27 @@ load_pipeline(void *obj)
   vertex_attribute[0].location = 0;
   vertex_attribute[0].binding = 0;
   vertex_attribute[0].format = VK_FORMAT_R32G32B32_SFLOAT;
-  vertex_attribute[0].offset = offsetof(BluCat::SkeletalMeshVertex, position);
+  vertex_attribute[0].offset = offsetof(BluCat::GRA::SkeletalMeshVertex, position);
   // Normal.
   vertex_attribute[1].location = 1;
   vertex_attribute[1].binding = 0;
   vertex_attribute[1].format = VK_FORMAT_R32G32B32_SFLOAT;
-  vertex_attribute[1].offset = offsetof(BluCat::SkeletalMeshVertex, normal);
+  vertex_attribute[1].offset = offsetof(BluCat::GRA::SkeletalMeshVertex, normal);
   // Texture coordinate.
   vertex_attribute[2].location = 2;
   vertex_attribute[2].binding = 0;
   vertex_attribute[2].format = VK_FORMAT_R32G32_SFLOAT;
-  vertex_attribute[2].offset = offsetof(BluCat::SkeletalMeshVertex, texture_coord);
+  vertex_attribute[2].offset = offsetof(BluCat::GRA::SkeletalMeshVertex, texture_coord);
   // Bones ids.
   vertex_attribute[3].location = 3;
   vertex_attribute[3].binding = 0;
   vertex_attribute[3].format = VK_FORMAT_R32G32B32A32_SINT;
-  vertex_attribute[3].offset = offsetof(BluCat::SkeletalMeshVertex, bone_ids);
+  vertex_attribute[3].offset = offsetof(BluCat::GRA::SkeletalMeshVertex, bone_ids);
   // Bones weights.
   vertex_attribute[4].location = 4;
   vertex_attribute[4].binding = 0;
   vertex_attribute[4].format = VK_FORMAT_R32G32B32A32_SFLOAT;
-  vertex_attribute[4].offset = offsetof(BluCat::SkeletalMeshVertex, bone_weights);
+  vertex_attribute[4].offset = offsetof(BluCat::GRA::SkeletalMeshVertex, bone_weights);
 
   VkPipelineVertexInputStateCreateInfo vertex_input_info = {};
   vertex_input_info.sType =
@@ -113,14 +112,14 @@ load_pipeline(void *obj)
   VkViewport viewport = {};
   viewport.x = 0;
   viewport.y = 0;
-  viewport.width = cg_core.display_width;
-  viewport.height = cg_core.display_height;
+  viewport.width = BluCat::INT::core.display_width;
+  viewport.height = BluCat::INT::core.display_height;
   viewport.minDepth = 0.0f;
   viewport.maxDepth = 1.0f;
 
   VkRect2D scissor = {};
   scissor.offset = {0, 0};
-  scissor.extent = {cg_core.display_width, cg_core.display_height};
+  scissor.extent = {BluCat::INT::core.display_width, BluCat::INT::core.display_height};
 
   VkPipelineViewportStateCreateInfo viewport_state = {};
   viewport_state.sType =
@@ -223,14 +222,14 @@ load_pipeline(void *obj)
   pipeline_info.pDepthStencilState = &depth_stencil;
   pipeline_info.pColorBlendState = &color_blending;
   pipeline_info.pDynamicState = &dynamic_state_info;
-  pipeline_info.layout = cg_core.vk_graphics_pipeline_3d_layout->pipeline;
-  pipeline_info.renderPass = cg_core.vk_render_pass->pipeline_3d;
+  pipeline_info.layout = BluCat::INT::core.vk_graphics_pipeline_3d_layout->pipeline;
+  pipeline_info.renderPass = BluCat::INT::core.vk_render_pass->pipeline_3d;
   pipeline_info.subpass = 0;
   pipeline_info.basePipelineHandle = VK_NULL_HANDLE;
   pipeline_info.basePipelineIndex = -1;
 
   if(vkCreateGraphicsPipelines(
-       cg_core.vk_device_with_swapchain->device, VK_NULL_HANDLE, 1,
+       BluCat::INT::core.vk_device_with_swapchain->device, VK_NULL_HANDLE, 1,
        &pipeline_info, nullptr, &self->graphic_pipeline)
      != VK_SUCCESS)
     throw CommandError{"Failed to create graphics pipeline."};
@@ -239,10 +238,11 @@ load_pipeline(void *obj)
 void
 unload_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipeline3DSkeletal*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipeline3DSkeletal*>(obj);
 
   vkDestroyPipeline(
-    cg_core.vk_device_with_swapchain->device, self->graphic_pipeline, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->graphic_pipeline,
+		nullptr);
 }
 
 const CommandChain loader{
@@ -251,7 +251,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 GraphicsPipeline3DSkeletal::GraphicsPipeline3DSkeletal()
@@ -266,7 +266,7 @@ GraphicsPipeline3DSkeletal::~GraphicsPipeline3DSkeletal()
 
 void
 GraphicsPipeline3DSkeletal::draw(
-  std::shared_ptr<View3D> view, const VkCommandBuffer draw_command_buffer,
+  std::shared_ptr<View> view, const VkCommandBuffer draw_command_buffer,
   const size_t current_frame, const uint32_t image_index)
 {
 	vkCmdBindPipeline(
@@ -275,7 +275,7 @@ GraphicsPipeline3DSkeletal::draw(
 
 	// Draw models
 	for(auto& [skeletal_mesh, instances]:
-	cg_core.vk_renderer->skeletal_models_to_draw[current_frame])
+				INT::core.vk_renderer->skeletal_models_to_draw[current_frame])
 	{
 		VkBuffer vertex_buffers[]{skeletal_mesh->vertex_buffer->buffer};
 		VkDeviceSize offsets[]{0};
@@ -294,21 +294,21 @@ GraphicsPipeline3DSkeletal::draw(
 			glm::mat4 rotation_matrix{glm::toMat4(*instance->orientation)};
 
 			std::array<VkDescriptorSet, 4> vk_descriptor_sets{
-				cg_core.vk_light->descriptor_sets_world[image_index],
-				view->descriptor_sets_3d[image_index],
+				INT::core.vk_light->descriptor_sets_world[image_index],
+				view->descriptor_sets[image_index],
 				instance->descriptor_sets[image_index],
 				instance->texture->descriptor_sets[image_index]};
 
 			vkCmdBindDescriptorSets(
 				draw_command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
-				cg_core.vk_graphics_pipeline_3d_layout->pipeline, 0,
+				INT::core.vk_graphics_pipeline_3d_layout->pipeline, 0,
 				vk_descriptor_sets.size(), vk_descriptor_sets.data(), 0, nullptr);
 
 			vkCmdDrawIndexed(
 				draw_command_buffer, skeletal_mesh->index_count, 1, 0, 0, 0);
 
-			BluCat::UDOSkeletalModel udo_skeletal_model{};
-			instance->tick(cg_core.delta_time);
+			BluCat::GRA::UDOSkeletalModel udo_skeletal_model{};
+			instance->tick(INT::core.delta_time);
 			udo_skeletal_model.base_matrix = translation_matrix * rotation_matrix;
 			std::copy(instance->bone_transforms.begin(),
 								instance->bone_transforms.end(),
diff --git a/src/blucat/graphics_pipeline_3d_skeletal.hpp b/src/blu_cat/gra/graphics_pipeline_3d_skeletal.hpp
index 430d2ec..16d65b0 100644
--- a/src/blucat/graphics_pipeline_3d_skeletal.hpp
+++ b/src/blu_cat/gra/graphics_pipeline_3d_skeletal.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,16 +14,16 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_3D_SKELETAL_H
-#define CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_3D_SKELETAL_H 1
+#ifndef BLU_CAT_GRA_GRAPHICS_PIPELINE_3D_SKELETAL_H
+#define BLU_CAT_GRA_GRAPHICS_PIPELINE_3D_SKELETAL_H 1
 
 #include <memory>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "command_pool.hpp"
-#include "view_3d.hpp"
+#include "view.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct GraphicsPipeline3DSkeletal
@@ -34,10 +34,10 @@ struct GraphicsPipeline3DSkeletal
   ~GraphicsPipeline3DSkeletal();
 
   void
-  draw(std::shared_ptr<View3D> view, const VkCommandBuffer draw_command_buffer,
+  draw(std::shared_ptr<View> view, const VkCommandBuffer draw_command_buffer,
        const size_t current_frame, const uint32_t image_index);
 };
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_SKELETAL_3D_H */
+#endif /* BLU_CAT_GRA_GRAPHICS_PIPELINE_SKELETAL_3D_H */
diff --git a/src/blucat/graphics_pipeline_sprite_3d.cpp b/src/blu_cat/gra/graphics_pipeline_sprite_3d.cpp
index a71e8bc..63e10b9 100644
--- a/src/blucat/graphics_pipeline_sprite_3d.cpp
+++ b/src/blu_cat/gra/graphics_pipeline_sprite_3d.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,8 +18,7 @@
 
 #include <array>
 
-#include "../core.hpp"
-#include "core.hpp"
+#include "../int/core.hpp"
 #include "sprite.hpp"
 #include "uniform_data_object.hpp"
 
@@ -28,7 +27,7 @@ namespace
 
 struct Sprite3DOrder
 {
-  std::shared_ptr<BluCat::Sprite3D> sprite_3d;
+  std::shared_ptr<BluCat::GRA::Sprite3D> sprite_3d;
   float distance;
 };
 
@@ -47,7 +46,7 @@ operator>(const Sprite3DOrder &a, const Sprite3DOrder &b)
 void
 load_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipelineSprite3D*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipelineSprite3D*>(obj);
 
   VkPipelineShaderStageCreateInfo vert_shader_stage_info{};
   vert_shader_stage_info.sType =
@@ -56,7 +55,7 @@ load_pipeline(void *obj)
   vert_shader_stage_info.flags = 0;
   vert_shader_stage_info.stage = VK_SHADER_STAGE_VERTEX_BIT;
   vert_shader_stage_info.module =
-    cg_core.vk_device_with_swapchain->vert_sprite_3d_shader_module;
+    BluCat::INT::core.vk_device_with_swapchain->vert_sprite_3d_shader_module;
   vert_shader_stage_info.pName = "main";
   vert_shader_stage_info.pSpecializationInfo = nullptr;
 
@@ -67,7 +66,7 @@ load_pipeline(void *obj)
   frag_shader_stage_info.flags = 0;
   frag_shader_stage_info.stage = VK_SHADER_STAGE_FRAGMENT_BIT;
   frag_shader_stage_info.module =
-    cg_core.vk_device_with_swapchain->frag_sprite_3d_shader_module;
+    BluCat::INT::core.vk_device_with_swapchain->frag_sprite_3d_shader_module;
   frag_shader_stage_info.pName = "main";
   frag_shader_stage_info.pSpecializationInfo = nullptr;
 
@@ -110,14 +109,14 @@ load_pipeline(void *obj)
   VkViewport viewport = {};
   viewport.x = 0;
   viewport.y = 0;
-  viewport.width = cg_core.display_width;
-  viewport.height = cg_core.display_height;
+  viewport.width = BluCat::INT::core.display_width;
+  viewport.height = BluCat::INT::core.display_height;
   viewport.minDepth = 0.0f;
   viewport.maxDepth = 1.0f;
 
   VkRect2D scissor = {};
   scissor.offset = {0, 0};
-  scissor.extent = {cg_core.display_width, cg_core.display_height};
+  scissor.extent = {BluCat::INT::core.display_width, BluCat::INT::core.display_height};
 
   VkPipelineViewportStateCreateInfo viewport_state = {};
   viewport_state.sType =
@@ -222,14 +221,14 @@ load_pipeline(void *obj)
   pipeline_info.pDepthStencilState = &depth_stencil;
   pipeline_info.pColorBlendState = &color_blending;
   pipeline_info.pDynamicState = &dynamic_state_info;
-  pipeline_info.layout = cg_core.vk_graphics_pipeline_3d_layout->pipeline;
-  pipeline_info.renderPass = cg_core.vk_render_pass->pipeline_3d;
+  pipeline_info.layout = BluCat::INT::core.vk_graphics_pipeline_3d_layout->pipeline;
+  pipeline_info.renderPass = BluCat::INT::core.vk_render_pass->pipeline_3d;
   pipeline_info.subpass = 0;
   pipeline_info.basePipelineHandle = VK_NULL_HANDLE;
   pipeline_info.basePipelineIndex = -1;
 
   if(vkCreateGraphicsPipelines(
-       cg_core.vk_device_with_swapchain->device, VK_NULL_HANDLE, 1,
+       BluCat::INT::core.vk_device_with_swapchain->device, VK_NULL_HANDLE, 1,
        &pipeline_info, nullptr, &self->graphic_pipeline)
      != VK_SUCCESS)
     throw CommandError{"Failed to create graphics pipeline sprite 3d."};
@@ -238,10 +237,11 @@ load_pipeline(void *obj)
 void
 unload_pipeline(void *obj)
 {
-  auto self = static_cast<BluCat::GraphicsPipelineSprite3D*>(obj);
+  auto self = static_cast<BluCat::GRA::GraphicsPipelineSprite3D*>(obj);
 
   vkDestroyPipeline(
-    cg_core.vk_device_with_swapchain->device, self->graphic_pipeline, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->graphic_pipeline,
+		nullptr);
 }
 
 const CommandChain loader{
@@ -250,7 +250,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 GraphicsPipelineSprite3D::GraphicsPipelineSprite3D()
@@ -265,7 +265,7 @@ GraphicsPipelineSprite3D::~GraphicsPipelineSprite3D()
 
 void
 GraphicsPipelineSprite3D::draw(
-  std::shared_ptr<View3D> view, const VkCommandBuffer draw_command_buffer,
+  std::shared_ptr<View> view, const VkCommandBuffer draw_command_buffer,
   const size_t current_frame, const uint32_t image_index)
 {
   vkCmdBindPipeline(
@@ -275,10 +275,10 @@ GraphicsPipelineSprite3D::draw(
   std::vector<Sprite3DOrder> sprite_3d_order;
   { // Sort sprites 3D
     sprite_3d_order.reserve(
-      cg_core.vk_renderer->sprites_3d_to_draw[current_frame].size());
+      INT::core.vk_renderer->sprites_3d_to_draw[current_frame].size());
 
-    for(std::shared_ptr<BluCat::Sprite3D> sprite:
-	  cg_core.vk_renderer->sprites_3d_to_draw[current_frame])
+    for(std::shared_ptr<BluCat::GRA::Sprite3D> sprite:
+	  INT::core.vk_renderer->sprites_3d_to_draw[current_frame])
       sprite_3d_order.emplace_back(
 	sprite, glm::distance(*view->camera_position, *sprite->position));
 
@@ -289,8 +289,8 @@ GraphicsPipelineSprite3D::draw(
   for(auto& sprite: sprite_3d_order)
   {
     std::array<VkDescriptorSet, 4> vk_descriptor_sets{
-      cg_core.vk_light->descriptor_sets_world[image_index],
-      view->descriptor_sets_3d[image_index],
+			INT::core.vk_light->descriptor_sets_world[image_index],
+      view->descriptor_sets[image_index],
       sprite.sprite_3d->descriptor_sets[image_index],
       sprite.sprite_3d->sprite->texture->descriptor_sets[image_index]};
     VkDeviceSize offsets[]{0};
@@ -300,7 +300,7 @@ GraphicsPipelineSprite3D::draw(
       &sprite.sprite_3d->sprite->vertex_buffer->buffer, offsets);
     vkCmdBindDescriptorSets(
       draw_command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
-      cg_core.vk_graphics_pipeline_3d_layout->pipeline, 0,
+      INT::core.vk_graphics_pipeline_3d_layout->pipeline, 0,
       vk_descriptor_sets.size(), vk_descriptor_sets.data(), 0, nullptr);
 
     UDOSprite3D ubo_sprite_3d{};
diff --git a/src/blucat/graphics_pipeline_sprite_3d.hpp b/src/blu_cat/gra/graphics_pipeline_sprite_3d.hpp
index 969f905..d03b8e8 100644
--- a/src/blucat/graphics_pipeline_sprite_3d.hpp
+++ b/src/blu_cat/gra/graphics_pipeline_sprite_3d.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,17 +14,17 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_SPRITE_3D_H
-#define CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_SPRITE_3D_H 1
+#ifndef BLU_CAT_GRA_GRAPHICS_PIPELINE_SPRITE_3D_H
+#define BLU_CAT_GRA_GRAPHICS_PIPELINE_SPRITE_3D_H 1
 
 #include <memory>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "command_pool.hpp"
 #include "sprite_3d.hpp"
-#include "view_3d.hpp"
+#include "view.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct GraphicsPipelineSprite3D
@@ -35,10 +35,10 @@ struct GraphicsPipelineSprite3D
   ~GraphicsPipelineSprite3D();
 
   void
-  draw(std::shared_ptr<View3D> view, const VkCommandBuffer draw_command_buffer,
+  draw(std::shared_ptr<View> view, const VkCommandBuffer draw_command_buffer,
        const size_t current_frame, const uint32_t image_index);
 };
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_GRAPHICS_PIPELINE_SPRITE_3D_H */
+#endif /* BLU_CAT_GRA_GRAPHICS_PIPELINE_SPRITE_3D_H */
diff --git a/src/blucat/image.cpp b/src/blu_cat/gra/image.cpp
index 7f8633f..76e4f9d 100644
--- a/src/blucat/image.cpp
+++ b/src/blu_cat/gra/image.cpp
@@ -16,9 +16,9 @@
 
 #include "image.hpp"
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 
-namespace BluCat::Image
+namespace BluCat::GRA::Image
 {
 
 Error::Error(const std::string &m):
@@ -39,7 +39,7 @@ Error::what() const noexcept
 
 void
 create(
-  BluCat::Device *device,
+  BluCat::GRA::Device *device,
   VkImage *image,
   VkDeviceMemory *image_memory,
   VkFormat format,
@@ -117,7 +117,7 @@ void move_image_state(
 }
 
 void create_view(
-  BluCat::Device *device,
+  BluCat::GRA::Device *device,
   VkImageView *image_view,
   const VkImage &image,
   VkFormat format,
diff --git a/src/blucat/image.hpp b/src/blu_cat/gra/image.hpp
index cb6cfd4..ba64b76 100644
--- a/src/blucat/image.hpp
+++ b/src/blu_cat/gra/image.hpp
@@ -14,16 +14,16 @@
  * limitations under the License.
  */
 
-#ifndef BLUE_KITTY_BLUCAT_IMAGE_H
-#define BLUE_KITTY_BLUCAT_IMAGE_H 1
+#ifndef BLU_CAT_GRA_IMAGE_H
+#define BLU_CAT_GRA_IMAGE_H 1
 
 #include <memory>
 #include <string>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "device.hpp"
 
-namespace BluCat::Image
+namespace BluCat::GRA::Image
 {
 
 struct Error: public std::exception
@@ -40,7 +40,7 @@ private:
 
 void
 create(
-  BluCat::Device *device,
+  BluCat::GRA::Device *device,
   VkImage *image,
   VkDeviceMemory *image_memory,
   VkFormat format,
@@ -63,11 +63,11 @@ move_image_state(
 
 void
 create_view(
-  BluCat::Device *device,
+  BluCat::GRA::Device *device,
   VkImageView *image_view,
   const VkImage &image,
   VkFormat format,
   VkImageAspectFlags image_aspect_flags);
 }
 
-#endif /* CANDY_GEAR_BLUCAT_IMAGE_H */
+#endif /* BLU_CAT_GRA_IMAGE_H */
diff --git a/src/blucat/light.cpp b/src/blu_cat/gra/light.cpp
index 5efc6ec..403dcf4 100644
--- a/src/blucat/light.cpp
+++ b/src/blu_cat/gra/light.cpp
@@ -18,7 +18,7 @@
 
 #include <array>
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 #include "uniform_data_object.hpp"
 
 namespace
@@ -27,14 +27,14 @@ namespace
 void
 load_world_vert_uniform_buffer(void *obj)
 {
-  auto self = static_cast<BluCat::Light*>(obj);
+  auto self = static_cast<BluCat::GRA::Light*>(obj);
 
   try
   {
-    self->ub_world_vert.reserve(cg_core.vk_swapchain->images_count);
-    for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+    self->ub_world_vert.reserve(BluCat::INT::core.vk_swapchain->images_count);
+    for(auto i{0}; i < BluCat::INT::core.vk_swapchain->images_count; i++)
       self->ub_world_vert.emplace_back(
-	cg_core.vk_device_with_swapchain, sizeof(BluCat::UDOWorld3D_Vert));
+	BluCat::INT::core.vk_device_with_swapchain, sizeof(BluCat::GRA::UDOWorld3D_Vert));
   }
   catch(const std::exception& e)
   {
@@ -45,7 +45,7 @@ load_world_vert_uniform_buffer(void *obj)
 void
 unload_world_vert_uniform_buffer(void *obj)
 {
-  auto self = static_cast<BluCat::Light*>(obj);
+  auto self = static_cast<BluCat::GRA::Light*>(obj);
 
   self->ub_world_vert.clear();
 }
@@ -53,14 +53,14 @@ unload_world_vert_uniform_buffer(void *obj)
 void
 load_world_frag_uniform_buffer(void *obj)
 {
-  auto self = static_cast<BluCat::Light*>(obj);
+  auto self = static_cast<BluCat::GRA::Light*>(obj);
 
   try
   {
-    self->ub_world_frag.reserve(cg_core.vk_swapchain->images_count);
-    for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+    self->ub_world_frag.reserve(BluCat::INT::core.vk_swapchain->images_count);
+    for(auto i{0}; i < BluCat::INT::core.vk_swapchain->images_count; i++)
       self->ub_world_frag.emplace_back(
-	cg_core.vk_device_with_swapchain, sizeof(BluCat::UDOWorld3D_Frag));
+	BluCat::INT::core.vk_device_with_swapchain, sizeof(BluCat::GRA::UDOWorld3D_Frag));
   }
   catch(const std::exception& e)
   {
@@ -71,7 +71,7 @@ load_world_frag_uniform_buffer(void *obj)
 void
 unload_world_frag_uniform_buffer(void *obj)
 {
-  auto self = static_cast<BluCat::Light*>(obj);
+  auto self = static_cast<BluCat::GRA::Light*>(obj);
 
   self->ub_world_frag.clear();
 }
@@ -79,7 +79,7 @@ unload_world_frag_uniform_buffer(void *obj)
 void
 load_descriptor_pool(void *obj)
 {
-  auto self = static_cast<BluCat::Light*>(obj);
+  auto self = static_cast<BluCat::GRA::Light*>(obj);
 
   uint32_t uniform_buffers_count =
     self->ub_world_vert.size() + self->ub_world_vert.size();
@@ -97,7 +97,7 @@ load_descriptor_pool(void *obj)
   pool_info.pPoolSizes = &descriptor_pool_size;
 
   if(vkCreateDescriptorPool(
-       cg_core.vk_device_with_swapchain->device, &pool_info, nullptr,
+       BluCat::INT::core.vk_device_with_swapchain->device, &pool_info, nullptr,
        &self->descriptor_pool) != VK_SUCCESS)
     throw CommandError{"Failed to create a Vulkan descriptor pool."};
 }
@@ -105,21 +105,21 @@ load_descriptor_pool(void *obj)
 void
 unload_descriptor_pool(void *obj)
 {
-  auto self = static_cast<BluCat::Light*>(obj);
+  auto self = static_cast<BluCat::GRA::Light*>(obj);
 
   vkDestroyDescriptorPool(
-    cg_core.vk_device_with_swapchain->device, self->descriptor_pool,
+    BluCat::INT::core.vk_device_with_swapchain->device, self->descriptor_pool,
     nullptr);
 }
 
 void
 load_descriptor_sets_world(void *obj)
 {
-  auto self = static_cast<BluCat::Light*>(obj);
+  auto self = static_cast<BluCat::GRA::Light*>(obj);
 
   std::vector<VkDescriptorSetLayout> layouts(
-    cg_core.vk_swapchain->images_count,
-    cg_core.vk_descriptor_set_layout->world);
+    BluCat::INT::core.vk_swapchain->images_count,
+    BluCat::INT::core.vk_descriptor_set_layout->world);
 
   VkDescriptorSetAllocateInfo alloc_info{};
   alloc_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
@@ -129,7 +129,7 @@ load_descriptor_sets_world(void *obj)
 
   self->descriptor_sets_world.resize(layouts.size());
   if(vkAllocateDescriptorSets(
-       cg_core.vk_device_with_swapchain->device, &alloc_info,
+       BluCat::INT::core.vk_device_with_swapchain->device, &alloc_info,
        self->descriptor_sets_world.data()) != VK_SUCCESS)
     throw CommandError{"Failed to create Vulkan world descriptor set."};
 }
@@ -137,19 +137,19 @@ load_descriptor_sets_world(void *obj)
 void
 load_resources_to_descriptor_sets(void *obj)
 {
-  auto self = static_cast<BluCat::Light*>(obj);
+  auto self = static_cast<BluCat::GRA::Light*>(obj);
 
-  for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+  for(auto i{0}; i < BluCat::INT::core.vk_swapchain->images_count; i++)
   {
     VkDescriptorBufferInfo world_vert_info{};
     world_vert_info.buffer = self->ub_world_vert[i].buffer;
     world_vert_info.offset = 0;
-    world_vert_info.range = sizeof(BluCat::UDOWorld3D_Vert);
+    world_vert_info.range = sizeof(BluCat::GRA::UDOWorld3D_Vert);
 
     VkDescriptorBufferInfo world_frag_info{};
     world_frag_info.buffer = self->ub_world_frag[i].buffer;
     world_frag_info.offset = 0;
-    world_frag_info.range = sizeof(BluCat::UDOWorld3D_Frag);
+    world_frag_info.range = sizeof(BluCat::GRA::UDOWorld3D_Frag);
 
     std::array<VkWriteDescriptorSet, 2> write_descriptors{};
     write_descriptors[0].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
@@ -173,7 +173,7 @@ load_resources_to_descriptor_sets(void *obj)
     write_descriptors[1].pTexelBufferView = nullptr;
 
     vkUpdateDescriptorSets(
-      cg_core.vk_device_with_swapchain->device, write_descriptors.size(),
+      BluCat::INT::core.vk_device_with_swapchain->device, write_descriptors.size(),
       write_descriptors.data(), 0, nullptr);
   }
 }
@@ -189,7 +189,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 Light::Light()
diff --git a/src/blucat/light.hpp b/src/blu_cat/gra/light.hpp
index 7e1d3a1..22a9e2d 100644
--- a/src/blucat/light.hpp
+++ b/src/blu_cat/gra/light.hpp
@@ -14,13 +14,13 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_LIGHT_H
-#define CANDY_GEAR_BLUCAT_LIGHT_H 1
+#ifndef BLU_CAT_GRA_LIGHT_H
+#define BLU_CAT_GRA_LIGHT_H 1
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "uniform_buffer.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct Light
@@ -38,4 +38,4 @@ struct Light
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_LIGHT_H */
+#endif /* BLU_CAT_GRA_LIGHT_H */
diff --git a/src/log.cpp b/src/blu_cat/gra/log.cpp
index 78044c4..78044c4 100644
--- a/src/log.cpp
+++ b/src/blu_cat/gra/log.cpp
diff --git a/src/log.hpp b/src/blu_cat/gra/log.hpp
index 2856f20..2856f20 100644
--- a/src/log.hpp
+++ b/src/blu_cat/gra/log.hpp
diff --git a/src/blucat/qoi.cpp b/src/blu_cat/gra/qoi.cpp
index 663e4e9..40968df 100644
--- a/src/blucat/qoi.cpp
+++ b/src/blu_cat/gra/qoi.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,7 +19,7 @@
 #include <array>
 #include <fstream>
 
-#include "../binary_reader.hpp"
+#include "../com/binary_reader.hpp"
 
 namespace
 {
@@ -92,7 +92,7 @@ color_hash(const RGBA &colors)
 
 }
 
-namespace BluCat::QOI
+namespace BluCat::GRA::QOI
 {
 
 Image::Image(const char *file_path, uint8_t channels):
diff --git a/src/blucat/qoi.hpp b/src/blu_cat/gra/qoi.hpp
index cd33205..f8be4ec 100644
--- a/src/blucat/qoi.hpp
+++ b/src/blu_cat/gra/qoi.hpp
@@ -16,7 +16,7 @@
 
 #include <cstdint>
 
-namespace BluCat::QOI
+namespace BluCat::GRA::QOI
 {
   struct Header
   {
diff --git a/src/blucat/queue.cpp b/src/blu_cat/gra/queue.cpp
index c00d874..3f47a19 100644
--- a/src/blucat/queue.cpp
+++ b/src/blu_cat/gra/queue.cpp
@@ -18,11 +18,11 @@
 
 #include "queue_family.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 Queue::Queue(
-  BluCat::QueueFamily *queue_family, VkQueue queue, int queue_index):
+  BluCat::GRA::QueueFamily *queue_family, VkQueue queue, int queue_index):
   queue_family{queue_family},
   queue{queue},
   queue_index{queue_index}
diff --git a/src/blucat/queue.hpp b/src/blu_cat/gra/queue.hpp
index a71dc9d..3dc9833 100644
--- a/src/blucat/queue.hpp
+++ b/src/blu_cat/gra/queue.hpp
@@ -14,18 +14,18 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_QUEUE_H
-#define CANDY_GEAR_BLUCAT_QUEUE_H 1
+#ifndef BLU_CAT_GRA_QUEUE_H
+#define BLU_CAT_GRA_QUEUE_H 1
 
-#include "core.hpp"
+#include "vulkan.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 class QueueFamily;
 
 struct Queue
 {
-  friend class BluCat::QueueFamily;
+  friend class BluCat::GRA::QueueFamily;
 
   Queue(const Queue &t) = delete;
   Queue& operator=(const Queue &t) = delete;
@@ -42,10 +42,10 @@ struct Queue
   ~Queue();
 
 private:
-  BluCat::QueueFamily *queue_family;
+  BluCat::GRA::QueueFamily *queue_family;
   int queue_index;
 
-  Queue(BluCat::QueueFamily *queue_family, VkQueue queue, int queue_index);
+  Queue(BluCat::GRA::QueueFamily *queue_family, VkQueue queue, int queue_index);
 };
 
 template<typename T> void
@@ -79,4 +79,4 @@ Queue::submit_one_time_command(
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_QUEUE_H */
+#endif /* BLU_CAT_GRA_QUEUE_H */
diff --git a/src/blucat/queue_family.cpp b/src/blu_cat/gra/queue_family.cpp
index 32aaf4b..59086b5 100644
--- a/src/blucat/queue_family.cpp
+++ b/src/blu_cat/gra/queue_family.cpp
@@ -20,13 +20,13 @@
 #include <sstream>
 #endif
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 QueueFamily::QueueFamily(
-  BluCat::Device *device, uint32_t family_index,
+  BluCat::GRA::Device *device, uint32_t family_index,
   const VkQueueFamilyProperties &queue_family_properties):
   queue_mutex{}
 {
@@ -47,7 +47,7 @@ QueueFamily::QueueFamily(
   message << "Sparse Binding: " <<
     (queue_family_properties.queueFlags & VK_QUEUE_SPARSE_BINDING_BIT ?
      "true" : "false") << std::endl;
-  cg_core.log.message(Log::Level::Trace, message.str());
+  INT::core.log.message(Log::Level::Trace, message.str());
 #endif
 
   this->device = device;
diff --git a/src/blucat/queue_family.hpp b/src/blu_cat/gra/queue_family.hpp
index 2486316..4673058 100644
--- a/src/blucat/queue_family.hpp
+++ b/src/blu_cat/gra/queue_family.hpp
@@ -14,16 +14,16 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_QUEUE_FAMILY_H
-#define CANDY_GEAR_BLUCAT_QUEUE_FAMILY_H 1
+#ifndef BLU_CAT_GRA_QUEUE_FAMILY_H
+#define BLU_CAT_GRA_QUEUE_FAMILY_H 1
 
 #include <mutex>
 #include <vector>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "queue.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 class Device;
 
@@ -41,12 +41,12 @@ class QueueFamily
   std::vector<QueueState> queue_states;
 
 public:
-  BluCat::Device *device;
+  BluCat::GRA::Device *device;
 
   uint32_t family_index;
   VkQueueFamilyProperties family_properties;
 
-  QueueFamily(BluCat::Device *device, uint32_t family_index,
+  QueueFamily(BluCat::GRA::Device *device, uint32_t family_index,
 	      const VkQueueFamilyProperties &queue_family_properties);
 
   Queue
@@ -55,4 +55,4 @@ public:
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_QUEUE_FAMILY_H */
+#endif /* BLU_CAT_GRA_QUEUE_FAMILY_H */
diff --git a/src/blucat/rectangle.cpp b/src/blu_cat/gra/rectangle.cpp
index 34f844d..ea01a04 100644
--- a/src/blucat/rectangle.cpp
+++ b/src/blu_cat/gra/rectangle.cpp
@@ -16,7 +16,7 @@
 
 #include "rectangle.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 const int Rectangle::VertexCount{4};
diff --git a/src/blucat/rectangle.hpp b/src/blu_cat/gra/rectangle.hpp
index 876508c..cd09239 100644
--- a/src/blucat/rectangle.hpp
+++ b/src/blu_cat/gra/rectangle.hpp
@@ -14,17 +14,17 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_RECTANGLE_H
-#define CANDY_GEAR_BLUCAT_RECTANGLE_H 1
+#ifndef BLU_CAT_GRA_RECTANGLE_H
+#define BLU_CAT_GRA_RECTANGLE_H 1
 
 #include <vector>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "destination_buffer.hpp"
 #include "queue_family.hpp"
 #include "uniform_buffer.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct Rectangle
@@ -39,4 +39,4 @@ struct Rectangle
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_RECTANGLE_H */
+#endif /* BLU_CAT_GRA_RECTANGLE_H */
diff --git a/src/blucat/render_pass.cpp b/src/blu_cat/gra/render_pass.cpp
index 0eb30e3..64fdf56 100644
--- a/src/blucat/render_pass.cpp
+++ b/src/blu_cat/gra/render_pass.cpp
@@ -18,7 +18,7 @@
 
 #include <array>
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 
 namespace
 {
@@ -26,12 +26,12 @@ namespace
 void
 load_3d(void *obj)
 {
-  auto self = static_cast<BluCat::RenderPass*>(obj);
+  auto self = static_cast<BluCat::GRA::RenderPass*>(obj);
 
   std::array<VkAttachmentDescription, 2> attachments{};
   // Color attachment.
   attachments[0].flags = 0;
-  attachments[0].format = cg_core.vk_swapchain->image_format;
+  attachments[0].format = BluCat::INT::core.vk_swapchain->image_format;
   attachments[0].samples = VK_SAMPLE_COUNT_1_BIT;
   attachments[0].loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
   attachments[0].storeOp = VK_ATTACHMENT_STORE_OP_STORE;
@@ -95,29 +95,29 @@ load_3d(void *obj)
   render_pass_info.pDependencies = &dependency;
 
   if(vkCreateRenderPass(
-       cg_core.vk_device_with_swapchain->device, &render_pass_info, nullptr,
-       &self->pipeline_3d) != VK_SUCCESS)
+       BluCat::INT::core.vk_device_with_swapchain->device, &render_pass_info,
+			 nullptr, &self->pipeline_3d) != VK_SUCCESS)
     throw CommandError{"Failed to create Vulkan Render Pass 3D."};
 }
 
 void
 unload_3d(void *obj)
 {
-  auto self = static_cast<BluCat::RenderPass*>(obj);
+  auto self = static_cast<BluCat::GRA::RenderPass*>(obj);
 
   vkDestroyRenderPass(
-    cg_core.vk_device_with_swapchain->device, self->pipeline_3d, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->pipeline_3d, nullptr);
 }
 
 void
 load_2d(void *obj)
 {
-  auto self = static_cast<BluCat::RenderPass*>(obj);
+  auto self = static_cast<BluCat::GRA::RenderPass*>(obj);
 
   std::array<VkAttachmentDescription, 1> attachments{};
   // Color attachment.
   attachments[0].flags = 0;
-  attachments[0].format = cg_core.vk_swapchain->image_format;
+  attachments[0].format = BluCat::INT::core.vk_swapchain->image_format;
   attachments[0].samples = VK_SAMPLE_COUNT_1_BIT;
   attachments[0].loadOp = VK_ATTACHMENT_LOAD_OP_LOAD;
   attachments[0].storeOp = VK_ATTACHMENT_STORE_OP_STORE;
@@ -166,7 +166,7 @@ load_2d(void *obj)
   render_pass_info.pDependencies = &dependency;
 
   if(vkCreateRenderPass(
-       cg_core.vk_device_with_swapchain->device, &render_pass_info,
+       BluCat::INT::core.vk_device_with_swapchain->device, &render_pass_info,
        nullptr, &self->pipeline_2d) != VK_SUCCESS)
     throw CommandError{"Failed to create Vulkan Render Pass 2D."};
 }
@@ -174,10 +174,10 @@ load_2d(void *obj)
 void
 unload_2d(void *obj)
 {
-  auto self = static_cast<BluCat::RenderPass*>(obj);
+  auto self = static_cast<BluCat::GRA::RenderPass*>(obj);
 
   vkDestroyRenderPass(
-    cg_core.vk_device_with_swapchain->device, self->pipeline_2d, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->pipeline_2d, nullptr);
 }
 
 const CommandChain loader{
@@ -187,7 +187,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 RenderPass::RenderPass()
diff --git a/src/blucat/render_pass.hpp b/src/blu_cat/gra/render_pass.hpp
index 196ce97..4187261 100644
--- a/src/blucat/render_pass.hpp
+++ b/src/blu_cat/gra/render_pass.hpp
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_RENDER_PASS_H
-#define CANDY_GEAR_BLUCAT_RENDER_PASS_H 1
+#ifndef BLU_CAT_GRA_RENDER_PASS_H
+#define BLU_CAT_GRA_RENDER_PASS_H 1
 
-#include "core.hpp"
+#include "vulkan.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct RenderPass
@@ -33,4 +33,4 @@ struct RenderPass
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_RENDER_PASS_H */
+#endif /* BLU_CAT_GRA_RENDER_PASS_H */
diff --git a/src/blucat/renderer.cpp b/src/blu_cat/gra/renderer.cpp
index 75822e0..36b9925 100644
--- a/src/blucat/renderer.cpp
+++ b/src/blu_cat/gra/renderer.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,22 +18,46 @@
 
 #include <array>
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 #include "uniform_data_object.hpp"
 
 namespace
 {
 
 void
+load_2d_uniform_buffer(void *obj)
+{
+  auto self = static_cast<BluCat::GRA::Renderer*>(obj);
+
+  try
+  {
+    self->ub_2d.reserve(BluCat::INT::core.vk_swapchain->images_count);
+    for(auto i{0}; i < BluCat::INT::core.vk_swapchain->images_count; i++)
+      self->ub_2d.emplace_back(
+				BluCat::INT::core.vk_device_with_swapchain,
+				sizeof(BluCat::GRA::UDOView2D));
+  }
+  catch(const std::exception& e)
+  {
+    throw CommandError{e.what()};
+  }
+}
+
+void
+unload_2d_uniform_buffer(void *obj)
+{
+  auto self = static_cast<BluCat::GRA::Renderer*>(obj);
+
+  self->ub_2d.clear();
+}
+
+void
 load_descriptor_pool(void *obj)
 {
-  auto self = static_cast<BluCat::Renderer*>(obj);
+  auto self = static_cast<BluCat::GRA::Renderer*>(obj);
 
-  uint32_t uniform_buffer_count = 0;
-  for(auto &view : self->views_3d)
-    uniform_buffer_count += (view->ub_3d.size() + view->ub_2d.size());
-  for(auto &view : self->views_2d)
-    uniform_buffer_count += (view->ub_2d.size());
+  uint32_t uniform_buffer_count = self->ub_2d.size();
+  for(auto &view : self->views) uniform_buffer_count += view->ub_3d.size();
 
   VkDescriptorPoolSize descriptor_pool_size{};
   descriptor_pool_size.type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
@@ -48,42 +72,97 @@ load_descriptor_pool(void *obj)
   pool_info.pPoolSizes = &descriptor_pool_size;
 
   if(vkCreateDescriptorPool(
-       cg_core.vk_device_with_swapchain->device, &pool_info, nullptr,
+       BluCat::INT::core.vk_device_with_swapchain->device, &pool_info, nullptr,
        &self->descriptor_pool) != VK_SUCCESS)
     throw CommandError{"Failed to create a Vulkan descriptor pool."};
 
-  for(auto &view : self->views_3d)
-    view->load_descriptor_sets(self->descriptor_pool);
-  for(auto &view : self->views_2d)
+  for(auto &view : self->views)
     view->load_descriptor_sets(self->descriptor_pool);
 }
 
 void
 unload_descriptor_pool(void *obj)
 {
-  auto self = static_cast<BluCat::Renderer*>(obj);
+  auto self = static_cast<BluCat::GRA::Renderer*>(obj);
 
-  for(auto &view : self->views_3d) view->unload_descriptor_sets();
-  for(auto &view : self->views_2d) view->unload_descriptor_sets();
+  for(auto &view : self->views) view->unload_descriptor_sets();
 
   vkDestroyDescriptorPool(
-    cg_core.vk_device_with_swapchain->device, self->descriptor_pool,
+    BluCat::INT::core.vk_device_with_swapchain->device, self->descriptor_pool,
     nullptr);
 }
 
 void
+load_descriptor_sets_2d(void *obj)
+{
+  auto self = static_cast<BluCat::GRA::Renderer*>(obj);
+
+  std::vector<VkDescriptorSetLayout> layouts(
+    BluCat::INT::core.vk_swapchain->images_count,
+    BluCat::INT::core.vk_descriptor_set_layout->view);
+
+  VkDescriptorSetAllocateInfo alloc_info{};
+  alloc_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
+  alloc_info.descriptorPool = self->descriptor_pool;
+  alloc_info.descriptorSetCount = layouts.size();
+  alloc_info.pSetLayouts = layouts.data();
+
+  self->descriptor_sets_2d.resize(layouts.size());
+  if(vkAllocateDescriptorSets(
+       BluCat::INT::core.vk_device_with_swapchain->device, &alloc_info,
+       self->descriptor_sets_2d.data()) != VK_SUCCESS)
+    throw CommandError{"Failed to create Vulkan descriptor sets for view."};
+}
+
+void
+load_resources_to_descriptor_sets_2d(void *obj)
+{
+  auto self = static_cast<BluCat::GRA::Renderer*>(obj);
+
+  for(auto i{0}; i < self->ub_2d.size(); i++)
+  {
+    VkDescriptorBufferInfo view_2d_info{};
+    view_2d_info.buffer = self->ub_2d[i].buffer;
+    view_2d_info.offset = 0;
+    view_2d_info.range = sizeof(BluCat::GRA::UDOView2D);
+
+    std::array<VkWriteDescriptorSet, 1> write_descriptors{};
+    write_descriptors[0].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+    write_descriptors[0].dstSet = self->descriptor_sets_2d[i];
+    write_descriptors[0].dstBinding = 0;
+    write_descriptors[0].dstArrayElement = 0;
+    write_descriptors[0].descriptorCount = 1;
+    write_descriptors[0].descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+    write_descriptors[0].pBufferInfo = &view_2d_info;
+    write_descriptors[0].pImageInfo = nullptr;
+    write_descriptors[0].pTexelBufferView = nullptr;
+
+    vkUpdateDescriptorSets(
+      BluCat::INT::core.vk_device_with_swapchain->device, write_descriptors.size(),
+      write_descriptors.data(), 0, nullptr);
+
+    BluCat::GRA::UDOView2D ubo_view_2d;
+    ubo_view_2d.proj = glm::ortho(
+      0.0f, self->projection_width,
+      0.0f, self->projection_height,
+      0.0f, 100.0f);
+    self->ub_2d[i].copy_data(&ubo_view_2d);
+  }
+}
+
+void
 load_queue_family(void *obj)
 {
-  auto self = static_cast<BluCat::Renderer*>(obj);
+  auto self = static_cast<BluCat::GRA::Renderer*>(obj);
 
   self->queue_family =
-    cg_core.vk_device_with_swapchain->get_queue_family_with_presentation();
+    BluCat::INT::core.vk_device_with_swapchain->get_queue_family_with_presentation();
 }
 
 void
 load_command_pool(void *obj)
 {
-  auto self = static_cast<BluCat::Renderer*>(obj);
+  auto self = static_cast<BluCat::GRA::Renderer*>(obj);
 
   VkCommandPoolCreateInfo create_info{};
   create_info.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
@@ -99,12 +178,9 @@ load_command_pool(void *obj)
 void
 unload_command_pool(void *obj)
 {
-  auto self = static_cast<BluCat::Renderer*>(obj);
+  auto self = static_cast<BluCat::GRA::Renderer*>(obj);
 
-  vkWaitForFences(cg_core.vk_device_with_swapchain->device,
-		  BluCat::Swapchain::max_frames_in_flight,
-		  cg_core.vk_swapchain->in_flight_fences.data(), VK_TRUE,
-		  std::numeric_limits<uint64_t>::max());
+	self->wait_frame();
   vkDestroyCommandPool(
     self->queue_family->device->device, self->command_pool, nullptr);
 }
@@ -112,7 +188,7 @@ unload_command_pool(void *obj)
 void
 load_draw_command_buffer(void *obj)
 {
-  auto self = static_cast<BluCat::Renderer*>(obj);
+  auto self = static_cast<BluCat::GRA::Renderer*>(obj);
 
   // FIXME: 3 is a magical number, triple buffering.
   self->draw_command_buffers.resize(3);
@@ -131,7 +207,10 @@ load_draw_command_buffer(void *obj)
 }
 
 const CommandChain loader{
+	{&load_2d_uniform_buffer, &unload_2d_uniform_buffer},
   {&load_descriptor_pool, &unload_descriptor_pool},
+	{&load_descriptor_sets_2d, nullptr},
+	{&load_resources_to_descriptor_sets_2d, nullptr},
   {&load_queue_family, nullptr},
   {&load_command_pool, &unload_command_pool},
   {&load_draw_command_buffer, nullptr}
@@ -139,23 +218,28 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
-Renderer::Renderer(std::vector<std::shared_ptr<View2D>> views_2d,
-		   std::vector<std::shared_ptr<View3D>> views_3d):
-  skeletal_models_to_draw{cg_core.vk_swapchain->images_count},
-  static_models_to_draw{cg_core.vk_swapchain->images_count},
-  sprites_3d_to_draw{cg_core.vk_swapchain->images_count},
-  views_2d{views_2d},
-  views_3d{views_3d}
+Renderer::Renderer(
+	std::vector<std::shared_ptr<View>> views, F32 width, F32 height):
+  skeletal_models_to_draw{BluCat::INT::core.vk_swapchain->images_count},
+  static_models_to_draw{BluCat::INT::core.vk_swapchain->images_count},
+  sprites_3d_to_draw{BluCat::INT::core.vk_swapchain->images_count},
+	rectangles_to_draw{BluCat::INT::core.vk_swapchain->images_count},
+	sprites_to_draw{BluCat::INT::core.vk_swapchain->images_count},
+  projection_width{width},
+	projection_height{height},
+	clear_screen_color{0.0f, 0.0f, 0.0f, 1.0f},
+  views{views}
 {
   loader.execute(this);
 }
 
-Renderer::Renderer(std::initializer_list<std::shared_ptr<View2D>> views_2d,
-		   std::initializer_list<std::shared_ptr<View3D>> views_3d):
-  Renderer(std::vector(views_2d), std::vector(views_3d))
+Renderer::Renderer(
+	std::initializer_list<std::shared_ptr<View>> views,
+	F32 width, F32 height):
+  Renderer(std::vector(views), width, height)
 {
 }
 
@@ -164,32 +248,44 @@ Renderer::~Renderer()
   loader.revert(this);
 }
 
+// FIXME: this is a workaround to prevent a code to free some resource while
+// it still being rendered.
+void
+Renderer::wait_frame()
+{
+  vkWaitForFences(BluCat::INT::core.vk_device_with_swapchain->device,
+		  BluCat::GRA::Swapchain::max_frames_in_flight,
+		  BluCat::INT::core.vk_swapchain->in_flight_fences.data(), VK_TRUE,
+		  std::numeric_limits<uint64_t>::max());
+}
+
 void
 Renderer::draw()
 {
   auto fence_status = vkGetFenceStatus(
-    cg_core.vk_device_with_swapchain->device,
-    cg_core.vk_swapchain->in_flight_fences[
-      cg_core.vk_swapchain->current_frame]);
+    BluCat::INT::core.vk_device_with_swapchain->device,
+    BluCat::INT::core.vk_swapchain->in_flight_fences[
+      BluCat::INT::core.vk_swapchain->current_frame]);
 
   if(fence_status == VK_SUCCESS)
   {
-    auto next_frame = cg_core.vk_swapchain->current_frame + 1;
+    auto next_frame = BluCat::INT::core.vk_swapchain->current_frame + 1;
     if(next_frame == Swapchain::max_frames_in_flight) next_frame = 0;
 
-    vkResetFences(cg_core.vk_device_with_swapchain->device, 1,
-		  &cg_core.vk_swapchain->in_flight_fences[
-		    cg_core.vk_swapchain->current_frame]);
+    vkResetFences(INT::core.vk_device_with_swapchain->device, 1,
+		  &BluCat::INT::core.vk_swapchain->in_flight_fences[
+		    BluCat::INT::core.vk_swapchain->current_frame]);
 
     uint32_t image_index;
     vkAcquireNextImageKHR(
-      cg_core.vk_device_with_swapchain->device,
-      cg_core.vk_swapchain->swapchain, std::numeric_limits<uint64_t>::max(),
-      cg_core.vk_swapchain->image_available_semaphores[
-	cg_core.vk_swapchain->current_frame], VK_NULL_HANDLE, &image_index);
+      BluCat::INT::core.vk_device_with_swapchain->device,
+      BluCat::INT::core.vk_swapchain->swapchain,
+			std::numeric_limits<uint64_t>::max(),
+      BluCat::INT::core.vk_swapchain->image_available_semaphores[
+	BluCat::INT::core.vk_swapchain->current_frame], VK_NULL_HANDLE, &image_index);
 
     VkCommandBuffer draw_command_buffer =
-      this->draw_command_buffers[cg_core.vk_swapchain->current_frame];
+      this->draw_command_buffers[BluCat::INT::core.vk_swapchain->current_frame];
     vkResetCommandBuffer(draw_command_buffer, 0);
 
     // Begin command buffer.
@@ -204,16 +300,15 @@ Renderer::draw()
 
     // 3D drawing.
     {
-      // Dark gray blue.
       std::array<VkClearValue, 2> clear_values{};
-      clear_values[0].color = {0.12f, 0.12f, 0.18f, 1.0f};
+      clear_values[0].color = this->clear_screen_color;
       clear_values[1].depthStencil = {1.0f, 0};
 
       { // Update world uniform buffer
 	UDOWorld3D_Vert ubo_world_3d_vert{};
 	ubo_world_3d_vert.ambient_light_color =
 	  glm::vec4{0.25, 0.25, 0.25, 1.0};
-	cg_core.vk_light->ub_world_vert[image_index].copy_data(
+	BluCat::INT::core.vk_light->ub_world_vert[image_index].copy_data(
 	  &ubo_world_3d_vert);
 
 	UDOWorld3D_Frag ubo_world_3d_frag{};
@@ -221,20 +316,20 @@ Renderer::draw()
 	  glm::vec3{-0.57735, 0.57735, -0.57735};
 	ubo_world_3d_frag.directional_light_color =
 	  glm::vec4{0.8, 0.8, 0.8, 1.0};
-	cg_core.vk_light->ub_world_frag[image_index].copy_data(
+	BluCat::INT::core.vk_light->ub_world_frag[image_index].copy_data(
 	  &ubo_world_3d_frag);
       }
 
       VkRenderPassBeginInfo render_pass_begin{};
       render_pass_begin.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
       render_pass_begin.pNext = nullptr;
-      render_pass_begin.renderPass = cg_core.vk_render_pass->pipeline_3d;
+      render_pass_begin.renderPass = BluCat::INT::core.vk_render_pass->pipeline_3d;
       render_pass_begin.framebuffer =
-	cg_core.vk_framebuffer->pipeline_3d[image_index];
+	BluCat::INT::core.vk_framebuffer->pipeline_3d[image_index];
       render_pass_begin.renderArea.offset = {0, 0};
       render_pass_begin.renderArea.extent = {
-	static_cast<uint32_t>(cg_core.display_width),
-	static_cast<uint32_t>(cg_core.display_height)};
+	static_cast<uint32_t>(BluCat::INT::core.display_width),
+	static_cast<uint32_t>(BluCat::INT::core.display_height)};
       render_pass_begin.clearValueCount = clear_values.size();
       render_pass_begin.pClearValues = clear_values.data();
 
@@ -242,7 +337,7 @@ Renderer::draw()
 	draw_command_buffer, &render_pass_begin, VK_SUBPASS_CONTENTS_INLINE);
     }
 
-		for(auto &view: this->views_3d)
+		for(auto &view: this->views)
 		{
 			{ // Set viewport
 				VkViewport vk_viewport{};
@@ -262,20 +357,21 @@ Renderer::draw()
 				vkCmdSetScissor(draw_command_buffer, 0, 1, &vk_scissor);
 			}
 
-			cg_core.vk_graphics_pipeline_3d->draw(
-				view, draw_command_buffer, cg_core.vk_swapchain->current_frame,
+			BluCat::INT::core.vk_graphics_pipeline_3d->draw(
+				view, draw_command_buffer,
+				BluCat::INT::core.vk_swapchain->current_frame,
 				image_index);
 
-			cg_core.vk_graphics_pipeline_sprite_3d->draw(
-				view, draw_command_buffer, cg_core.vk_swapchain->current_frame,
-				image_index);
+			BluCat::INT::core.vk_graphics_pipeline_sprite_3d->draw(
+				view, draw_command_buffer,
+				BluCat::INT::core.vk_swapchain->current_frame, image_index);
 
-			cg_core.vk_graphics_pipeline_3d_skeletal->draw(
-				view, draw_command_buffer, cg_core.vk_swapchain->current_frame,
-				image_index);
+			BluCat::INT::core.vk_graphics_pipeline_3d_skeletal->draw(
+				view, draw_command_buffer,
+				BluCat::INT::core.vk_swapchain->current_frame, image_index);
 
 			{ // Update view uniform buffers
-				BluCat::UDOView3D ubo_view_3d{};
+				BluCat::GRA::UDOView3D ubo_view_3d{};
 
 				// View matrix.
 				glm::mat4 translation_matrix{1.0f};
@@ -300,13 +396,13 @@ Renderer::draw()
       VkRenderPassBeginInfo render_pass_begin{};
       render_pass_begin.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
       render_pass_begin.pNext = nullptr;
-      render_pass_begin.renderPass = cg_core.vk_render_pass->pipeline_2d;
+      render_pass_begin.renderPass = BluCat::INT::core.vk_render_pass->pipeline_2d;
       render_pass_begin.framebuffer =
-	cg_core.vk_framebuffer->pipeline_2d[image_index];
+	BluCat::INT::core.vk_framebuffer->pipeline_2d[image_index];
       render_pass_begin.renderArea.offset = {0, 0};
       render_pass_begin.renderArea.extent = {
-	static_cast<uint32_t>(cg_core.display_width),
-	static_cast<uint32_t>(cg_core.display_height)};
+	static_cast<uint32_t>(BluCat::INT::core.display_width),
+	static_cast<uint32_t>(BluCat::INT::core.display_height)};
       render_pass_begin.clearValueCount = 0;
       render_pass_begin.pClearValues = nullptr;
 
@@ -316,27 +412,15 @@ Renderer::draw()
     }
 
     { // 2D solid drawing
-      for(auto &view: this->views_2d)
-	cg_core.vk_graphics_pipeline_2d_solid->draw(
-	  view, draw_command_buffer, cg_core.vk_swapchain->current_frame,
-	  next_frame, image_index);
-
-      for(auto &view: this->views_3d)
-	cg_core.vk_graphics_pipeline_2d_solid->draw(
-	  view, draw_command_buffer, cg_core.vk_swapchain->current_frame,
-	  next_frame, image_index);
+			BluCat::INT::core.vk_graphics_pipeline_2d_solid->draw(
+				draw_command_buffer, BluCat::INT::core.vk_swapchain->current_frame,
+				next_frame, image_index);
     }
 
     { // 2D wired drawing
-      for(auto &view: this->views_2d)
-	cg_core.vk_graphics_pipeline_2d_wired->draw(
-	  view, draw_command_buffer, cg_core.vk_swapchain->current_frame,
-	  next_frame, image_index);
-
-      for(auto &view: this->views_3d)
-	cg_core.vk_graphics_pipeline_2d_wired->draw(
-	  view, draw_command_buffer, cg_core.vk_swapchain->current_frame,
-	  next_frame, image_index);
+			BluCat::INT::core.vk_graphics_pipeline_2d_wired->draw(
+				draw_command_buffer, BluCat::INT::core.vk_swapchain->current_frame,
+				next_frame, image_index);
     }
 
     vkCmdEndRenderPass(draw_command_buffer);
@@ -350,13 +434,13 @@ Renderer::draw()
       auto queue{this->queue_family->get_queue()};
 
       VkSemaphore wait_semaphores[]{
-	cg_core.vk_swapchain->image_available_semaphores[
-	  cg_core.vk_swapchain->current_frame]};
+	BluCat::INT::core.vk_swapchain->image_available_semaphores[
+	  BluCat::INT::core.vk_swapchain->current_frame]};
       VkPipelineStageFlags wait_stages[] =
 	{VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT};
       VkSemaphore signal_semaphores[]{
-	cg_core.vk_swapchain->render_finished_semaphores[
-	  cg_core.vk_swapchain->current_frame]};
+	BluCat::INT::core.vk_swapchain->render_finished_semaphores[
+	  BluCat::INT::core.vk_swapchain->current_frame]};
 
       VkSubmitInfo submit_info{};
       submit_info.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
@@ -370,11 +454,11 @@ Renderer::draw()
       submit_info.pSignalSemaphores = signal_semaphores;
 
       if(vkQueueSubmit(
-	   queue.queue, 1, &submit_info, cg_core.vk_swapchain->in_flight_fences[
-	     cg_core.vk_swapchain->current_frame]) != VK_SUCCESS)
+	   queue.queue, 1, &submit_info, BluCat::INT::core.vk_swapchain->in_flight_fences[
+	     BluCat::INT::core.vk_swapchain->current_frame]) != VK_SUCCESS)
 	throw std::runtime_error{"Failed to submit draw command buffer."};
 
-      VkSwapchainKHR swap_chains[]{cg_core.vk_swapchain->swapchain};
+      VkSwapchainKHR swap_chains[]{BluCat::INT::core.vk_swapchain->swapchain};
 
       VkPresentInfoKHR present_info{};
       present_info.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR;
@@ -394,19 +478,20 @@ Renderer::draw()
       this->skeletal_models_to_draw[next_frame].clear();
       this->static_models_to_draw[next_frame].clear();
       this->sprites_3d_to_draw[next_frame].clear();
-      cg_core.vk_swapchain->current_frame = next_frame;
+      BluCat::INT::core.vk_swapchain->current_frame = next_frame;
     }
   }
   else
   {
     // Clear images for the current frame because we are skipping this frame.
-    this->skeletal_models_to_draw[cg_core.vk_swapchain->current_frame].clear();
-    this->static_models_to_draw[cg_core.vk_swapchain->current_frame].clear();
-    this->sprites_3d_to_draw[cg_core.vk_swapchain->current_frame].clear();
-    for(auto &view: this->views_2d)
-      view->sprites_to_draw[cg_core.vk_swapchain->current_frame].clear();
-    for(auto &view: this->views_3d)
-      view->sprites_to_draw[cg_core.vk_swapchain->current_frame].clear();
+    this->skeletal_models_to_draw[
+			BluCat::INT::core.vk_swapchain->current_frame].clear();
+    this->static_models_to_draw[
+			BluCat::INT::core.vk_swapchain->current_frame].clear();
+    this->sprites_3d_to_draw[
+			BluCat::INT::core.vk_swapchain->current_frame].clear();
+		this->sprites_to_draw[
+			BluCat::INT::core.vk_swapchain->current_frame].clear();
   }
 }
 
diff --git a/src/blucat/renderer.hpp b/src/blu_cat/gra/renderer.hpp
index d23ebe5..58b9972 100644
--- a/src/blucat/renderer.hpp
+++ b/src/blu_cat/gra/renderer.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,24 +14,25 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_RENDERER_H
-#define CANDY_GEAR_BLUCAT_RENDERER_H 1
+#ifndef BLU_CAT_GRA_RENDERER_H
+#define BLU_CAT_GRA_RENDERER_H 1
 
 #include <initializer_list>
 #include <memory>
 #include <vector>
 
-#include "core.hpp"
+#include "vulkan.hpp"
+#include "queue_family.hpp"
+#include "rectangle.hpp"
 #include "skeletal_mesh.hpp"
 #include "skeletal_model.hpp"
 #include "sprite_3d.hpp"
+#include "sprite_to_draw.hpp"
 #include "static_mesh.hpp"
 #include "static_model.hpp"
-#include "queue_family.hpp"
-#include "view_2d.hpp"
-#include "view_3d.hpp"
+#include "view.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct Renderer
@@ -51,22 +52,35 @@ struct Renderer
   std::vector<std::vector<std::shared_ptr<Sprite3D>>> sprites_3d_to_draw;
 
   VkDescriptorPool descriptor_pool;
-  std::vector<std::shared_ptr<View2D>> views_2d;
-  std::vector<std::shared_ptr<View3D>> views_3d;
+	VkClearColorValue clear_screen_color;
+
+  float projection_width, projection_height;
+
+  // FIXME: if these vectors get resized, they can cause a segmentation fault!
+  std::vector<UniformBuffer> ub_2d;
+  std::vector<VkDescriptorSet> descriptor_sets_2d;
+
+  std::vector<std::vector<Rectangle>> rectangles_to_draw;
+  std::vector<std::vector<SpriteToDraw>> sprites_to_draw;
+
+  std::vector<std::shared_ptr<View>> views;
+
   QueueFamily *queue_family;
   VkCommandPool command_pool;
   std::vector<VkCommandBuffer> draw_command_buffers;
 
-  Renderer(std::vector<std::shared_ptr<View2D>> views_2d,
-           std::vector<std::shared_ptr<View3D>> views_3d);
-  Renderer(std::initializer_list<std::shared_ptr<View2D>> views_2d,
-           std::initializer_list<std::shared_ptr<View3D>> views_3d);
+  Renderer(std::vector<std::shared_ptr<View>> views, F32 width, F32 height);
+  Renderer(std::initializer_list<std::shared_ptr<View>> views,
+					 F32 width, F32 height);
   ~Renderer();
 
+	void
+	wait_frame();
+
   void
   draw();
 };
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_RENDERER_H */
+#endif /* BLU_CAT_GRA_RENDERER_H */
diff --git a/src/blu_cat/gra/skeletal_mesh.cpp b/src/blu_cat/gra/skeletal_mesh.cpp
new file mode 100644
index 0000000..1515dda
--- /dev/null
+++ b/src/blu_cat/gra/skeletal_mesh.cpp
@@ -0,0 +1,252 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "skeletal_mesh.hpp"
+
+#include "../com/binary_reader.hpp"
+#include "../com/command.hpp"
+#include "../int/core.hpp"
+#include "skeletal_mesh_vertex.hpp"
+
+namespace
+{
+
+struct StaticMeshHeader
+{
+	char file_magic[8];
+	UI32 version;
+	UI32 num_vertexes;
+	UI32 num_indexes;
+	UI32 num_bones;
+	UI32 num_animations;
+	UI32 num_bone_transforms; // For all animations
+	UI32 num_bone_positions; // For all animations
+	UI32 num_bone_rotations; // For all animations
+	UI32 num_bone_scales; // For all animations
+};
+
+constexpr UI64F SKELETAL_MESH_HEADER_SIZE{44};
+
+// Data that is only needed for the command chain but not for the SkeletalMesh
+// goes here.
+struct MeshBuilder
+{
+  std::string mesh_path;
+  BluCat::GRA::SkeletalMesh *mesh;
+
+  MeshBuilder(BluCat::GRA::SkeletalMesh *m, std::string mp);
+  MeshBuilder(BluCat::GRA::SkeletalMesh *m, const char* mp);
+};
+
+MeshBuilder::MeshBuilder(BluCat::GRA::SkeletalMesh *m, std::string mp):
+  mesh{m},
+  mesh_path{mp}
+{
+}
+
+MeshBuilder::MeshBuilder(BluCat::GRA::SkeletalMesh *m, const char *mp):
+  MeshBuilder{m, std::string(mp)}
+{
+}
+
+void
+load_mesh(void *obj)
+{
+  auto self = static_cast<MeshBuilder*>(obj);
+
+	StaticMeshHeader header;
+  BinaryReader input{self->mesh_path};
+
+	{ // Read header
+		input.read_chars(header.file_magic, 8);
+		header.version = input.read_ui32();
+		header.num_vertexes = input.read_ui32();
+		header.num_indexes = input.read_ui32();
+		header.num_bones = input.read_ui32();
+		header.num_animations = input.read_ui32();
+		header.num_bone_transforms = input.read_ui32();
+		header.num_bone_positions = input.read_ui32();
+		header.num_bone_rotations = input.read_ui32();
+		header.num_bone_scales = input.read_ui32();
+
+		size_t total_file_size{
+			SKELETAL_MESH_HEADER_SIZE +
+			header.num_vertexes * 16 * SIZE_32_BIT +
+			header.num_indexes * SIZE_32_BIT +
+			header.num_bones * 16 * SIZE_32_BIT +
+			header.num_animations * (2 * SIZE_64_BIT + SIZE_32_BIT) +
+			header.num_bone_transforms * 4 * SIZE_32_BIT +
+			header.num_bone_positions * (3 * SIZE_32_BIT + SIZE_64_BIT) +
+			header.num_bone_rotations * (4 * SIZE_32_BIT + SIZE_64_BIT) +
+			header.num_bone_scales * (3 * SIZE_32_BIT + SIZE_64_BIT)};
+
+		if(total_file_size != input.size())
+		{
+			std::string error{"File size does not match header information: "};
+			error += self->mesh_path;
+			throw CommandError{error};
+		}
+	}
+
+  self->mesh->queue_family =
+    BluCat::INT::core.vk_device_with_swapchain->
+		get_queue_family_with_graphics();
+
+  { // Load vertexes.
+    std::vector<BluCat::GRA::SkeletalMeshVertex> vertexes{header.num_vertexes};
+
+    for(auto i{0}; i < header.num_vertexes; i++)
+    {
+      vertexes[i].position = input.read_vec3();
+      vertexes[i].normal = input.read_vec3();
+      vertexes[i].texture_coord = input.read_vec2();
+
+      for(auto ii{0};
+					ii < BluCat::GRA::SKELETAL_MESH_MAX_NUM_OF_INFLUENCING_BONES;
+					ii++)
+				vertexes[i].bone_ids[ii] = input.read_ui32();
+
+      for(auto ii{0};
+					ii < BluCat::GRA::SKELETAL_MESH_MAX_NUM_OF_INFLUENCING_BONES;
+					ii++)
+				vertexes[i].bone_weights[ii] = input.read_f32();
+    }
+
+    void *vertexes_data{vertexes.data()};
+    size_t vertexes_size = sizeof(vertexes[0]) * vertexes.size();
+    self->mesh->source_vertex_buffer = new BluCat::GRA::SourceBuffer{
+      self->mesh->queue_family->device, vertexes_data, vertexes_size};
+    self->mesh->vertex_buffer = new BluCat::GRA::DestinationBuffer{
+      self->mesh->queue_family, self->mesh->source_vertex_buffer,
+      VK_BUFFER_USAGE_VERTEX_BUFFER_BIT};
+  }
+
+  { // Load indexes.
+    self->mesh->index_count = header.num_indexes;
+    std::vector<uint32_t> indexes(self->mesh->index_count);
+
+    for(auto i{0}; i < self->mesh->index_count; i++)
+      indexes[i] = input.read_ui32();
+
+    void *indexes_data{indexes.data()};
+    size_t indexes_size{sizeof(indexes[0]) * indexes.size()};
+    BluCat::GRA::SourceBuffer source_index_buffer{
+      self->mesh->queue_family->device, indexes_data, indexes_size};
+    self->mesh->index_buffer = new BluCat::GRA::DestinationBuffer{
+      self->mesh->queue_family, &source_index_buffer,
+      VK_BUFFER_USAGE_INDEX_BUFFER_BIT};
+  }
+
+  { // Load bones
+    self->mesh->bones.reserve(header.num_bones);
+    for(int i{0}; i < header.num_bones; i++)
+      self->mesh->bones.emplace_back(input.read_mat4());
+  }
+
+  { // Load animations
+    self->mesh->animations.resize(header.num_animations);
+    for(uint32_t i{0}; i < header.num_animations; i++)
+    {
+      auto duration{input.read_f64()};
+      self->mesh->animations[i].final_time = (float)duration;
+
+      auto ticks_per_second{input.read_f64()};
+
+      auto num_bone_transforms{input.read_ui32()};
+      std::vector<BluCat::GRA::BoneTransform> *bone_transforms =
+				&(self->mesh->animations[i].bone_transforms);
+      bone_transforms->resize(num_bone_transforms);
+      for(uint32_t bone_transform_index{0};
+					bone_transform_index < num_bone_transforms; bone_transform_index++)
+      {
+				auto bone_id{input.read_ui32()};
+
+				auto num_positions{input.read_ui32()};
+				BluCat::GRA::Channel<glm::vec3> *positions =
+					&((*bone_transforms)[bone_transform_index].positions);
+				for(auto position_key_index{0}; position_key_index < num_positions;
+						position_key_index++)
+				{
+					auto vec3{input.read_vec3()};
+					auto timestamp{input.read_f64()};
+					positions->key_frames.emplace_back(
+						vec3, static_cast<float>(timestamp));
+				}
+
+				auto num_rotations{input.read_ui32()};
+				BluCat::GRA::Channel<glm::quat> *rotations =
+					&((*bone_transforms)[bone_transform_index].rotations);
+				for(auto rotation_key_index{0}; rotation_key_index < num_rotations;
+						rotation_key_index++)
+				{
+					auto quat{input.read_quat()};
+					auto timestamp{input.read_f64()};
+					rotations->key_frames.emplace_back(
+						quat, static_cast<float>(timestamp));
+				}
+
+				auto num_scales{input.read_ui32()};
+				BluCat::GRA::Channel<glm::vec3> *scales =
+					&((*bone_transforms)[bone_transform_index].scales);
+				for(auto scaling_key_index{0}; scaling_key_index < num_scales;
+						scaling_key_index++)
+				{
+					auto vec3{input.read_vec3()};
+					auto timestamp{input.read_f64()};
+					scales->key_frames.emplace_back(vec3, static_cast<float>(timestamp));
+				}
+      }
+    }
+  }
+}
+
+void
+unload_mesh(void *obj)
+{
+  auto self = static_cast<MeshBuilder*>(obj);
+
+  delete self->mesh->index_buffer;
+  delete self->mesh->vertex_buffer;
+  delete self->mesh->source_vertex_buffer;
+}
+
+static const CommandChain loader{
+  {&load_mesh, &unload_mesh}
+};
+
+}
+
+namespace BluCat::GRA
+{
+
+SkeletalMesh::SkeletalMesh(std::string mesh_path)
+{
+  MeshBuilder mesh_builder(this, mesh_path);
+  loader.execute(&mesh_builder);
+}
+
+SkeletalMesh::SkeletalMesh(const char* mesh_path):
+  SkeletalMesh{std::string(mesh_path)}
+{
+}
+
+SkeletalMesh::~SkeletalMesh()
+{
+  MeshBuilder mesh_builder(this, "");
+  loader.revert(&mesh_builder);
+}
+
+}
diff --git a/src/blucat/skeletal_mesh.hpp b/src/blu_cat/gra/skeletal_mesh.hpp
index 8b7d0fe..f586ea3 100644
--- a/src/blucat/skeletal_mesh.hpp
+++ b/src/blu_cat/gra/skeletal_mesh.hpp
@@ -14,20 +14,20 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_SKELETAL_MESH_H
-#define CANDY_GEAR_BLUCAT_SKELETAL_MESH_H 1
+#ifndef BLU_CAT_GRA_SKELETAL_MESH_H
+#define BLU_CAT_GRA_SKELETAL_MESH_H 1
 
 #include <string>
 #include <vector>
 
 #include "animation.hpp"
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "destination_buffer.hpp"
 #include "queue_family.hpp"
 #include "uniform_buffer.hpp"
 #include "texture.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct SkeletalMesh
@@ -49,4 +49,4 @@ struct SkeletalMesh
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_SKELETAL_MESH_H */
+#endif /* BLU_CAT_GRA_SKELETAL_MESH_H */
diff --git a/src/blucat/skeletal_mesh_vertex.hpp b/src/blu_cat/gra/skeletal_mesh_vertex.hpp
index 533c2ab..1bd70ad 100644
--- a/src/blucat/skeletal_mesh_vertex.hpp
+++ b/src/blu_cat/gra/skeletal_mesh_vertex.hpp
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_SKELETAL_MESH_VERTEX_H
-#define CANDY_GEAR_BLUCAT_SKELETAL_MESH_VERTEX_H 1
+#ifndef BLU_CAT_GRA_SKELETAL_MESH_VERTEX_H
+#define BLU_CAT_GRA_SKELETAL_MESH_VERTEX_H 1
 
-#include "core.hpp"
+#include "vulkan.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 // This variable define the maximum ammount of bones that can influence a
@@ -39,4 +39,4 @@ struct SkeletalMeshVertex
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_SKELETAL_MESH_VERTEX_H */
+#endif /* BLU_CAT_GRA_SKELETAL_MESH_VERTEX_H */
diff --git a/src/blucat/skeletal_model.cpp b/src/blu_cat/gra/skeletal_model.cpp
index 8761bc8..4b44910 100644
--- a/src/blucat/skeletal_model.cpp
+++ b/src/blu_cat/gra/skeletal_model.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,7 +16,7 @@
 
 #include "skeletal_model.hpp"
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 #include "uniform_data_object.hpp"
 
 namespace
@@ -25,14 +25,15 @@ namespace
 void
 load_uniform_buffers(void *obj)
 {
-  auto self = static_cast<BluCat::SkeletalModel*>(obj);
+  auto self = static_cast<BluCat::GRA::SkeletalModel*>(obj);
 
   try
   {
-    self->uniform_buffers.reserve(cg_core.vk_swapchain->images_count);
-    for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+    self->uniform_buffers.reserve(BluCat::INT::core.vk_swapchain->images_count);
+    for(auto i{0}; i < BluCat::INT::core.vk_swapchain->images_count; i++)
       self->uniform_buffers.emplace_back(
-	cg_core.vk_device_with_swapchain, sizeof(BluCat::UDOSkeletalModel));
+				BluCat::INT::core.vk_device_with_swapchain,
+				sizeof(BluCat::GRA::UDOSkeletalModel));
   }
   catch(const std::exception& e)
   {
@@ -43,7 +44,7 @@ load_uniform_buffers(void *obj)
 void
 unload_uniform_buffers(void *obj)
 {
-  auto self = static_cast<BluCat::SkeletalModel*>(obj);
+  auto self = static_cast<BluCat::GRA::SkeletalModel*>(obj);
 
   self->uniform_buffers.clear();
 }
@@ -51,7 +52,7 @@ unload_uniform_buffers(void *obj)
 void
 load_descriptor_set_pool(void *obj)
 {
-  auto self = static_cast<BluCat::SkeletalModel*>(obj);
+  auto self = static_cast<BluCat::GRA::SkeletalModel*>(obj);
 
   std::array<VkDescriptorPoolSize, 1> descriptor_pool_sizes{};
   descriptor_pool_sizes[0].type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
@@ -75,7 +76,7 @@ load_descriptor_set_pool(void *obj)
 void
 unload_descriptor_set_pool(void *obj)
 {
-  auto self = static_cast<BluCat::SkeletalModel*>(obj);
+  auto self = static_cast<BluCat::GRA::SkeletalModel*>(obj);
 
   vkDestroyDescriptorPool(
     self->skeletal_mesh->queue_family->device->device, self->descriptor_pool,
@@ -85,11 +86,11 @@ unload_descriptor_set_pool(void *obj)
 void
 load_descriptor_sets(void *obj)
 {
-  auto self = static_cast<BluCat::SkeletalModel*>(obj);
+  auto self = static_cast<BluCat::GRA::SkeletalModel*>(obj);
 
   std::vector<VkDescriptorSetLayout> layouts(
-    cg_core.vk_swapchain->images_count,
-    cg_core.vk_descriptor_set_layout->model);
+    BluCat::INT::core.vk_swapchain->images_count,
+    BluCat::INT::core.vk_descriptor_set_layout->model);
 
   VkDescriptorSetAllocateInfo alloc_info{};
   alloc_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
@@ -107,14 +108,14 @@ load_descriptor_sets(void *obj)
 void
 load_buffers_to_descriptor_sets(void *obj)
 {
-  auto self = static_cast<BluCat::SkeletalModel*>(obj);
+  auto self = static_cast<BluCat::GRA::SkeletalModel*>(obj);
 
   for(auto i{0}; i < self->uniform_buffers.size(); i++)
   {
     VkDescriptorBufferInfo buffer_info{};
     buffer_info.buffer = self->uniform_buffers[i].buffer;
     buffer_info.offset = 0;
-    buffer_info.range = sizeof(BluCat::UDOSkeletalModel);
+    buffer_info.range = sizeof(BluCat::GRA::UDOSkeletalModel);
 
     std::array<VkWriteDescriptorSet, 1> write_descriptors{};
     write_descriptors[0].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
@@ -128,7 +129,7 @@ load_buffers_to_descriptor_sets(void *obj)
     write_descriptors[0].pTexelBufferView = nullptr;
 
     vkUpdateDescriptorSets(
-      cg_core.vk_device_with_swapchain->device, write_descriptors.size(),
+      BluCat::INT::core.vk_device_with_swapchain->device, write_descriptors.size(),
       write_descriptors.data(), 0, nullptr);
   }
 }
@@ -142,7 +143,7 @@ static const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 SkeletalModel::SkeletalModel(
@@ -171,7 +172,7 @@ SkeletalModel::~SkeletalModel()
 void
 SkeletalModel::tick(float delta)
 {
-  BluCat::Animation *current_animation =
+  BluCat::GRA::Animation *current_animation =
     &this->skeletal_mesh->animations[this->animation_index];
 
   { // update time
@@ -179,7 +180,7 @@ SkeletalModel::tick(float delta)
     if(this->animation_time > current_animation->final_time)
     {
       this->animation_time -= current_animation->final_time;
-      for(BluCat::BoneTransform &bone_transform:
+      for(BluCat::GRA::BoneTransform &bone_transform:
 	    current_animation->bone_transforms)
       {
 	bone_transform.positions.current_index = 0;
@@ -191,47 +192,50 @@ SkeletalModel::tick(float delta)
 
   for(int i{0}; i < current_animation->bone_transforms.size(); i++)
   {
-    BluCat::BoneTransform *bone_transform = &current_animation->bone_transforms[i];
+    BluCat::GRA::BoneTransform *bone_transform =
+			&current_animation->bone_transforms[i];
 
     auto position{bone_transform->positions.interpolate(
-	this->animation_time,
-	[](glm::vec3 frame)
-	  {
-	    return glm::translate(glm::mat4(1.0f), frame);
-	  },
-	[](glm::vec3 previous_frame, glm::vec3 next_frame, float scale_factor)
-	  {
-	    glm::vec3 final_position{glm::mix(
-		previous_frame, next_frame, scale_factor)};
-	    return glm::translate(glm::mat4(1.0f), final_position);
-	  })};
+				this->animation_time,
+				[](glm::vec3 frame)
+					{
+						return glm::translate(glm::mat4(1.0f), frame);
+					},
+				[](glm::vec3 previous_frame, glm::vec3 next_frame, float scale_factor)
+					{
+						glm::vec3 final_position{glm::mix(
+								previous_frame, next_frame, scale_factor)};
+						return glm::translate(glm::mat4(1.0f), final_position);
+					})};
 
     auto rotation{bone_transform->rotations.interpolate(
-	this->animation_time,
-	[](glm::quat frame)
-	  {
-	    return glm::toMat4(glm::normalize(frame));
-	  },
-	[](glm::quat previous_frame, glm::quat next_frame, float scale_factor)
-	  {
-	    return glm::toMat4(glm::slerp(
-				 previous_frame, next_frame, scale_factor));
-	  })};
+				this->animation_time,
+				[](glm::quat frame)
+					{
+						return glm::toMat4(glm::normalize(frame));
+					},
+				[](glm::quat previous_frame, glm::quat next_frame, float scale_factor)
+					{
+						return glm::toMat4(glm::slerp(
+																 previous_frame, next_frame, scale_factor));
+					})};
 
     auto scale{bone_transform->scales.interpolate(
-	this->animation_time,
-	[](glm::vec3 frame)
-	  {
-	    return glm::scale(glm::mat4(1.0f), frame);
-	  },
-	[](glm::vec3 previous_frame, glm::vec3 next_frame, float scale_factor)
-	  {
-	    glm::vec3 scale{glm::mix(
-		previous_frame, next_frame, scale_factor)};
-	    return glm::scale(glm::mat4(1.0f), scale);
-	  })};
-
-    this->bone_transforms[i] = position * rotation * scale;
+				this->animation_time,
+				[](glm::vec3 frame)
+					{
+						return glm::scale(glm::mat4(1.0f), frame);
+					},
+				[](glm::vec3 previous_frame, glm::vec3 next_frame, float scale_factor)
+					{
+						glm::vec3 scale{glm::mix(
+								previous_frame, next_frame, scale_factor)};
+						return glm::scale(glm::mat4(1.0f), scale);
+					})};
+
+    this->bone_transforms[i] =
+			this->skeletal_mesh->bones[i].offset_matrix *
+			(position * rotation * scale);
   }
 }
 
diff --git a/src/blucat/skeletal_model.hpp b/src/blu_cat/gra/skeletal_model.hpp
index cd3685e..73998cb 100644
--- a/src/blucat/skeletal_model.hpp
+++ b/src/blu_cat/gra/skeletal_model.hpp
@@ -14,16 +14,16 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_SKELETAL_MODEL_H
-#define CANDY_GEAR_BLUCAT_SKELETAL_MODEL_H 1
+#ifndef BLU_CAT_GRA_SKELETAL_MODEL_H
+#define BLU_CAT_GRA_SKELETAL_MODEL_H 1
 
 #include <memory>
 #include <vector>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "skeletal_mesh.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct SkeletalModel
@@ -52,4 +52,4 @@ struct SkeletalModel
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_SKELETAL_MODEL_H */
+#endif /* BLU_CAT_GRA_SKELETAL_MODEL_H */
diff --git a/src/blucat/source_buffer.cpp b/src/blu_cat/gra/source_buffer.cpp
index 41c40b9..18f263f 100644
--- a/src/blucat/source_buffer.cpp
+++ b/src/blu_cat/gra/source_buffer.cpp
@@ -18,7 +18,7 @@
 
 #include <cstring>
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 SourceBuffer::SourceBuffer(Device *device, void *data, size_t data_size)
@@ -31,7 +31,7 @@ SourceBuffer::SourceBuffer(Device *device, void *data, size_t data_size)
 
   try
   {
-    BluCat::BaseBuffer::loader.execute(static_cast<BluCat::BaseBuffer*>(this));
+    BluCat::GRA::BaseBuffer::loader.execute(static_cast<BluCat::GRA::BaseBuffer*>(this));
   }
   catch(const CommandError &command_error)
   {
@@ -71,7 +71,7 @@ SourceBuffer::operator=(SourceBuffer &&that)
 
 SourceBuffer::~SourceBuffer()
 {
-  BluCat::BaseBuffer::loader.revert(static_cast<BluCat::BaseBuffer*>(this));
+  BluCat::GRA::BaseBuffer::loader.revert(static_cast<BluCat::GRA::BaseBuffer*>(this));
 }
 
 void
diff --git a/src/blucat/source_buffer.hpp b/src/blu_cat/gra/source_buffer.hpp
index dd52acc..4eecec9 100644
--- a/src/blucat/source_buffer.hpp
+++ b/src/blu_cat/gra/source_buffer.hpp
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_SOURCE_BUFFER_H
-#define CANDY_GEAR_BLUCAT_SOURCE_BUFFER_H 1
+#ifndef BLU_CAT_GRA_SOURCE_BUFFER_H
+#define BLU_CAT_GRA_SOURCE_BUFFER_H 1
 
 #include "base_buffer.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct SourceBuffer: public BaseBuffer
@@ -42,4 +42,4 @@ struct SourceBuffer: public BaseBuffer
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_SOURCE_BUFFER_H */
+#endif /* BLU_CAT_GRA_SOURCE_BUFFER_H */
diff --git a/src/blucat/sprite.cpp b/src/blu_cat/gra/sprite.cpp
index a275df8..ee64efe 100644
--- a/src/blucat/sprite.cpp
+++ b/src/blu_cat/gra/sprite.cpp
@@ -18,7 +18,7 @@
 
 #include <array>
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 #include "sprite.hpp"
 #include "uniform_data_object.hpp"
 
@@ -27,13 +27,13 @@ namespace
 
 struct SpriteBuilder
 {
-  BluCat::Sprite *sprite;
-  glm::vec4 &rect;
+  BluCat::GRA::Sprite *sprite;
+  const glm::vec4 &rect;
 
-  SpriteBuilder(BluCat::Sprite *sprite, glm::vec4 &rect);
+  SpriteBuilder(BluCat::GRA::Sprite *sprite, const glm::vec4 &rect);
 };
 
-SpriteBuilder::SpriteBuilder(BluCat::Sprite *sprite, glm::vec4 &rect):
+SpriteBuilder::SpriteBuilder(BluCat::GRA::Sprite *sprite, const glm::vec4 &rect):
   sprite{sprite},
   rect{rect}
 {
@@ -45,9 +45,9 @@ load_mesh(void *obj)
   auto self = static_cast<SpriteBuilder*>(obj);
 
   self->sprite->queue_family =
-    cg_core.vk_device_with_swapchain->get_queue_family_with_graphics();
+    BluCat::INT::core.vk_device_with_swapchain->get_queue_family_with_graphics();
 
-  glm::vec2 rect[BluCat::Sprite::vertex_count]{
+  glm::vec2 rect[BluCat::GRA::Sprite::vertex_count]{
     glm::vec2{self->rect.x, self->rect.y},
     glm::vec2{self->rect.x, self->rect.w},
     glm::vec2{self->rect.z, self->rect.y},
@@ -56,10 +56,10 @@ load_mesh(void *obj)
 
   void *vertexes_data{&rect};
   static const size_t vertexes_size =
-    sizeof(glm::vec2) * BluCat::Sprite::vertex_count;
-  self->sprite->source_buffer = new BluCat::SourceBuffer{
+    sizeof(glm::vec2) * BluCat::GRA::Sprite::vertex_count;
+  self->sprite->source_buffer = new BluCat::GRA::SourceBuffer{
     self->sprite->queue_family->device, vertexes_data, vertexes_size};
-  self->sprite->vertex_buffer = new BluCat::DestinationBuffer{
+  self->sprite->vertex_buffer = new BluCat::GRA::DestinationBuffer{
     self->sprite->queue_family, self->sprite->source_buffer,
     VK_BUFFER_USAGE_VERTEX_BUFFER_BIT};
 }
@@ -79,10 +79,10 @@ static const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
-Sprite::Sprite(std::shared_ptr<Texture> texture, glm::vec4 &rect):
+Sprite::Sprite(std::shared_ptr<Texture> texture, const glm::vec4 &rect):
   texture{texture}
 {
   SpriteBuilder sprite_builder(this, rect);
diff --git a/src/blucat/sprite.hpp b/src/blu_cat/gra/sprite.hpp
index 6252d00..1834b22 100644
--- a/src/blucat/sprite.hpp
+++ b/src/blu_cat/gra/sprite.hpp
@@ -14,20 +14,20 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_SPRITE_H
-#define CANDY_GEAR_BLUCAT_SPRITE_H 1
+#ifndef BLU_CAT_GRA_SPRITE_H
+#define BLU_CAT_GRA_SPRITE_H 1
 
 #include <memory>
 #include <unordered_map>
 #include <vector>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "destination_buffer.hpp"
 #include "queue_family.hpp"
 #include "uniform_buffer.hpp"
 #include "texture.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct Sprite
@@ -41,10 +41,10 @@ struct Sprite
 
   std::shared_ptr<Texture> texture;
 
-  Sprite(std::shared_ptr<Texture> texture, glm::vec4 &rect);
+  Sprite(std::shared_ptr<Texture> texture, const glm::vec4 &rect);
   ~Sprite();
 };
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_SPRITE_H */
+#endif /* BLU_CAT_GRA_SPRITE_H */
diff --git a/src/blucat/sprite_3d.cpp b/src/blu_cat/gra/sprite_3d.cpp
index 6fa6d49..fc994a6 100644
--- a/src/blucat/sprite_3d.cpp
+++ b/src/blu_cat/gra/sprite_3d.cpp
@@ -16,7 +16,7 @@
 
 #include "sprite_3d.hpp"
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 #include "uniform_data_object.hpp"
 
 namespace
@@ -25,14 +25,14 @@ namespace
 void
 load_uniform_buffers(void *obj)
 {
-  auto self = static_cast<BluCat::Sprite3D*>(obj);
+  auto self = static_cast<BluCat::GRA::Sprite3D*>(obj);
 
   try
   {
-    self->uniform_buffers.reserve(cg_core.vk_swapchain->images_count);
-    for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+    self->uniform_buffers.reserve(BluCat::INT::core.vk_swapchain->images_count);
+    for(auto i{0}; i < BluCat::INT::core.vk_swapchain->images_count; i++)
       self->uniform_buffers.emplace_back(
-	cg_core.vk_device_with_swapchain, sizeof(BluCat::UDOSprite3D));
+				BluCat::INT::core.vk_device_with_swapchain, sizeof(BluCat::GRA::UDOSprite3D));
   }
   catch(const std::exception& e)
   {
@@ -43,7 +43,7 @@ load_uniform_buffers(void *obj)
 void
 unload_uniform_buffers(void *obj)
 {
-  auto self = static_cast<BluCat::Sprite3D*>(obj);
+  auto self = static_cast<BluCat::GRA::Sprite3D*>(obj);
 
   self->uniform_buffers.clear();
 }
@@ -51,7 +51,7 @@ unload_uniform_buffers(void *obj)
 void
 load_descriptor_set_pool(void *obj)
 {
-  auto self = static_cast<BluCat::Sprite3D*>(obj);
+  auto self = static_cast<BluCat::GRA::Sprite3D*>(obj);
 
   std::array<VkDescriptorPoolSize, 1> descriptor_pool_sizes{};
   descriptor_pool_sizes[0].type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
@@ -75,7 +75,7 @@ load_descriptor_set_pool(void *obj)
 void
 unload_descriptor_set_pool(void *obj)
 {
-  auto self = static_cast<BluCat::Sprite3D*>(obj);
+  auto self = static_cast<BluCat::GRA::Sprite3D*>(obj);
 
   vkDestroyDescriptorPool(
     self->queue_family->device->device, self->descriptor_pool, nullptr);
@@ -83,11 +83,11 @@ unload_descriptor_set_pool(void *obj)
 void
 load_descriptor_sets(void *obj)
 {
-  auto self = static_cast<BluCat::Sprite3D*>(obj);
+  auto self = static_cast<BluCat::GRA::Sprite3D*>(obj);
 
   std::vector<VkDescriptorSetLayout> layouts(
-    cg_core.vk_swapchain->images_count,
-    cg_core.vk_descriptor_set_layout->model);
+    BluCat::INT::core.vk_swapchain->images_count,
+    BluCat::INT::core.vk_descriptor_set_layout->model);
 
   VkDescriptorSetAllocateInfo alloc_info{};
   alloc_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
@@ -105,14 +105,14 @@ load_descriptor_sets(void *obj)
 void
 load_buffers_to_descriptor_sets(void *obj)
 {
-  auto self = static_cast<BluCat::Sprite3D*>(obj);
+  auto self = static_cast<BluCat::GRA::Sprite3D*>(obj);
 
   for(auto i{0}; i < self->uniform_buffers.size(); i++)
   {
     VkDescriptorBufferInfo buffer_info{};
     buffer_info.buffer = self->uniform_buffers[i].buffer;
     buffer_info.offset = 0;
-    buffer_info.range = sizeof(BluCat::UDOSprite3D);
+    buffer_info.range = sizeof(BluCat::GRA::UDOSprite3D);
 
     VkDescriptorImageInfo image_info{};
     image_info.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
@@ -131,7 +131,7 @@ load_buffers_to_descriptor_sets(void *obj)
     write_descriptors[0].pTexelBufferView = nullptr;
 
     vkUpdateDescriptorSets(
-      cg_core.vk_device_with_swapchain->device, write_descriptors.size(),
+      BluCat::INT::core.vk_device_with_swapchain->device, write_descriptors.size(),
       write_descriptors.data(), 0, nullptr);
   }
 }
@@ -145,18 +145,18 @@ static const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 Sprite3D::Sprite3D(
-    std::shared_ptr<BluCat::Sprite> sprite, std::shared_ptr<glm::vec3> position,
+    std::shared_ptr<BluCat::GRA::Sprite> sprite, std::shared_ptr<glm::vec3> position,
     glm::vec2 size):
   sprite{sprite},
   position{position},
   size{size}
 {
   this->queue_family =
-    cg_core.vk_device_with_swapchain->get_queue_family_with_graphics();
+    BluCat::INT::core.vk_device_with_swapchain->get_queue_family_with_graphics();
   loader.execute(this);
 }
 
diff --git a/src/blucat/sprite_3d.hpp b/src/blu_cat/gra/sprite_3d.hpp
index dd0f16e..0cd8c04 100644
--- a/src/blucat/sprite_3d.hpp
+++ b/src/blu_cat/gra/sprite_3d.hpp
@@ -14,13 +14,13 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_SPRITE_3D_H
-#define CANDY_GEAR_BLUCAT_SPRITE_3D_H 1
+#ifndef BLU_CAT_GRA_SPRITE_3D_H
+#define BLU_CAT_GRA_SPRITE_3D_H 1
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "sprite.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct Sprite3D
@@ -43,4 +43,4 @@ struct Sprite3D
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_SPRITE_3D_H */
+#endif /* BLU_CAT_GRA_SPRITE_3D_H */
diff --git a/src/blucat/sprite_to_draw.cpp b/src/blu_cat/gra/sprite_to_draw.cpp
index 9013adb..7645d73 100644
--- a/src/blucat/sprite_to_draw.cpp
+++ b/src/blu_cat/gra/sprite_to_draw.cpp
@@ -16,7 +16,7 @@
 
 #include "sprite_to_draw.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
   SpriteToDraw::SpriteToDraw(
     std::shared_ptr<Sprite> sprite, const glm::vec4 &position, float z_index):
diff --git a/src/blucat/sprite_to_draw.hpp b/src/blu_cat/gra/sprite_to_draw.hpp
index fb46eac..e7a23c4 100644
--- a/src/blucat/sprite_to_draw.hpp
+++ b/src/blu_cat/gra/sprite_to_draw.hpp
@@ -14,15 +14,15 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_SPRITES_TO_DRAW_H
-#define CANDY_GEAR_BLUCAT_SPRITES_TO_DRAW_H 1
+#ifndef BLU_CAT_GRA_SPRITES_TO_DRAW_H
+#define BLU_CAT_GRA_SPRITES_TO_DRAW_H 1
 
 #include <memory>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "sprite.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
   struct SpriteToDraw
   {
@@ -41,4 +41,4 @@ namespace BluCat
   operator>(const SpriteToDraw &a, const SpriteToDraw &b);
 }
 
-#endif /* CANDY_GEAR_BLUCAT_SPRITES_TO_DRAW_H */
+#endif /* BLU_CAT_GRA_SPRITES_TO_DRAW_H */
diff --git a/src/blucat/static_mesh.cpp b/src/blu_cat/gra/static_mesh.cpp
index ab45ca9..0b6088c 100644
--- a/src/blucat/static_mesh.cpp
+++ b/src/blu_cat/gra/static_mesh.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,32 +16,42 @@
 
 #include "static_mesh.hpp"
 
-#include "../binary_reader.hpp"
-#include "../command.hpp"
-#include "../core.hpp"
+#include "../com/binary_reader.hpp"
+#include "../com/command.hpp"
+#include "../int/core.hpp"
 #include "static_mesh_vertex.hpp"
 
 namespace
 {
 
+struct StaticMeshHeader
+{
+	char file_magic[8];
+	UI32 version;
+	UI32 num_vertexes;
+	UI32 num_indexes;
+};
+
+constexpr UI64F STATIC_MESH_HEADER_SIZE{20};
+
 // Data that is only needed for the command chain but not for the StaticMesh
 // goes here.
 struct MeshBuilder
 {
   std::string mesh_path;
-  BluCat::StaticMesh *mesh;
+  BluCat::GRA::StaticMesh *mesh;
 
-  MeshBuilder(BluCat::StaticMesh *m, std::string mp);
-  MeshBuilder(BluCat::StaticMesh *m, const char* mp);
+  MeshBuilder(BluCat::GRA::StaticMesh *m, std::string mp);
+  MeshBuilder(BluCat::GRA::StaticMesh *m, const char* mp);
 };
 
-MeshBuilder::MeshBuilder(BluCat::StaticMesh *m, std::string mp):
+MeshBuilder::MeshBuilder(BluCat::GRA::StaticMesh *m, std::string mp):
   mesh{m},
   mesh_path{mp}
 {
 }
 
-MeshBuilder::MeshBuilder(BluCat::StaticMesh *m, const char *mp):
+MeshBuilder::MeshBuilder(BluCat::GRA::StaticMesh *m, const char *mp):
   MeshBuilder{m, std::string(mp)}
 {
 }
@@ -51,16 +61,36 @@ load_mesh(void *obj)
 {
   auto self = static_cast<MeshBuilder*>(obj);
 
+  self->mesh->queue_family =
+    BluCat::INT::core.vk_device_with_swapchain->
+		get_queue_family_with_graphics();
+
+	StaticMeshHeader header;
   BinaryReader input{self->mesh_path};
 
-  self->mesh->queue_family =
-    cg_core.vk_device_with_swapchain->get_queue_family_with_graphics();
+	{ // Read header
+		input.read_chars(header.file_magic, 8);
+		header.version = input.read_ui32();
+		header.num_vertexes = input.read_ui32();
+		header.num_indexes = input.read_ui32();
+
+		size_t total_file_size{
+			STATIC_MESH_HEADER_SIZE +
+			header.num_vertexes * 8 * SIZE_32_BIT +
+			header.num_indexes * SIZE_32_BIT};
+
+		if(total_file_size != input.size())
+		{
+			std::string error{"File size does not match header information: "};
+			error += self->mesh_path;
+			throw CommandError{error};
+		}
+	}
 
   { // Load vertexes.
-    auto vertex_count{input.read_ui32()};
-    std::vector<BluCat::StaticMeshVertex> vertexes{vertex_count};
+    std::vector<BluCat::GRA::StaticMeshVertex> vertexes{header.num_vertexes};
 
-    for(auto i{0}; i < vertex_count; i++)
+    for(auto i{0}; i < header.num_vertexes; i++)
     {
       vertexes[i].position = input.read_vec3();
       vertexes[i].normal = input.read_vec3();
@@ -69,15 +99,15 @@ load_mesh(void *obj)
 
     void *vertexes_data{vertexes.data()};
     size_t vertexes_size = sizeof(vertexes[0]) * vertexes.size();
-    self->mesh->source_vertex_buffer = new BluCat::SourceBuffer{
+    self->mesh->source_vertex_buffer = new BluCat::GRA::SourceBuffer{
       self->mesh->queue_family->device, vertexes_data, vertexes_size};
-    self->mesh->vertex_buffer = new BluCat::DestinationBuffer{
+    self->mesh->vertex_buffer = new BluCat::GRA::DestinationBuffer{
       self->mesh->queue_family, self->mesh->source_vertex_buffer,
       VK_BUFFER_USAGE_VERTEX_BUFFER_BIT};
   }
 
   { // Load indexes
-    self->mesh->index_count = input.read_ui32();
+    self->mesh->index_count = header.num_indexes;
     std::vector<uint32_t> indexes(self->mesh->index_count);
 
     for(auto i{0}; i < self->mesh->index_count; i++)
@@ -85,9 +115,9 @@ load_mesh(void *obj)
 
     void *indexes_data{indexes.data()};
     size_t indexes_size{sizeof(indexes[0]) * indexes.size()};
-    BluCat::SourceBuffer source_index_buffer{
+    BluCat::GRA::SourceBuffer source_index_buffer{
       self->mesh->queue_family->device, indexes_data, indexes_size};
-    self->mesh->index_buffer = new BluCat::DestinationBuffer{
+    self->mesh->index_buffer = new BluCat::GRA::DestinationBuffer{
       self->mesh->queue_family, &source_index_buffer,
       VK_BUFFER_USAGE_INDEX_BUFFER_BIT};
   }
@@ -109,7 +139,7 @@ static const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 StaticMesh::StaticMesh(std::string mesh_path)
diff --git a/src/blucat/static_mesh.hpp b/src/blu_cat/gra/static_mesh.hpp
index 0efcfc1..2b059fe 100644
--- a/src/blucat/static_mesh.hpp
+++ b/src/blu_cat/gra/static_mesh.hpp
@@ -14,19 +14,19 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_STATIC_MESH_H
-#define CANDY_GEAR_BLUCAT_STATIC_MESH_H 1
+#ifndef BLU_CAT_GRA_STATIC_MESH_H
+#define BLU_CAT_GRA_STATIC_MESH_H 1
 
 #include <string>
 #include <vector>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "destination_buffer.hpp"
 #include "queue_family.hpp"
 #include "uniform_buffer.hpp"
 #include "texture.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct StaticMesh
@@ -45,4 +45,4 @@ struct StaticMesh
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_STATIC_MESH_H */
+#endif /* BLU_CAT_GRA_STATIC_MESH_H */
diff --git a/src/blucat/static_mesh_vertex.hpp b/src/blu_cat/gra/static_mesh_vertex.hpp
index 025ad63..510ce40 100644
--- a/src/blucat/static_mesh_vertex.hpp
+++ b/src/blu_cat/gra/static_mesh_vertex.hpp
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_STATIC_MESH_VERTEX_H
-#define CANDY_GEAR_BLUCAT_STATIC_MESH_VERTEX_H 1
+#ifndef BLU_CAT_GRA_STATIC_MESH_VERTEX_H
+#define BLU_CAT_GRA_STATIC_MESH_VERTEX_H 1
 
-#include "core.hpp"
+#include "vulkan.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct StaticMeshVertex
@@ -31,4 +31,4 @@ struct StaticMeshVertex
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_STATIC_MESH_VERTEX_H */
+#endif /* BLU_CAT_GRA_STATIC_MESH_VERTEX_H */
diff --git a/src/blucat/static_model.cpp b/src/blu_cat/gra/static_model.cpp
index e3c6482..50dc94d 100644
--- a/src/blucat/static_model.cpp
+++ b/src/blu_cat/gra/static_model.cpp
@@ -16,7 +16,7 @@
 
 #include "static_model.hpp"
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 #include "uniform_data_object.hpp"
 
 namespace
@@ -25,14 +25,14 @@ namespace
 void
 load_uniform_buffers(void *obj)
 {
-  auto self = static_cast<BluCat::StaticModel*>(obj);
+  auto self = static_cast<BluCat::GRA::StaticModel*>(obj);
 
   try
   {
-    self->uniform_buffers.reserve(cg_core.vk_swapchain->images_count);
-    for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+    self->uniform_buffers.reserve(BluCat::INT::core.vk_swapchain->images_count);
+    for(auto i{0}; i < BluCat::INT::core.vk_swapchain->images_count; i++)
       self->uniform_buffers.emplace_back(
-	cg_core.vk_device_with_swapchain, sizeof(BluCat::UDOStaticModel));
+				BluCat::INT::core.vk_device_with_swapchain, sizeof(BluCat::GRA::UDOStaticModel));
   }
   catch(const std::exception& e)
   {
@@ -43,7 +43,7 @@ load_uniform_buffers(void *obj)
 void
 unload_uniform_buffers(void *obj)
 {
-  auto self = static_cast<BluCat::StaticModel*>(obj);
+  auto self = static_cast<BluCat::GRA::StaticModel*>(obj);
 
   self->uniform_buffers.clear();
 }
@@ -51,7 +51,7 @@ unload_uniform_buffers(void *obj)
 void
 load_descriptor_set_pool(void *obj)
 {
-  auto self = static_cast<BluCat::StaticModel*>(obj);
+  auto self = static_cast<BluCat::GRA::StaticModel*>(obj);
 
   std::array<VkDescriptorPoolSize, 1> descriptor_pool_sizes{};
   descriptor_pool_sizes[0].type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
@@ -75,7 +75,7 @@ load_descriptor_set_pool(void *obj)
 void
 unload_descriptor_set_pool(void *obj)
 {
-  auto self = static_cast<BluCat::StaticModel*>(obj);
+  auto self = static_cast<BluCat::GRA::StaticModel*>(obj);
 
   vkDestroyDescriptorPool(
     self->static_mesh->queue_family->device->device, self->descriptor_pool,
@@ -85,11 +85,11 @@ unload_descriptor_set_pool(void *obj)
 void
 load_descriptor_sets(void *obj)
 {
-  auto self = static_cast<BluCat::StaticModel*>(obj);
+  auto self = static_cast<BluCat::GRA::StaticModel*>(obj);
 
   std::vector<VkDescriptorSetLayout> layouts(
-    cg_core.vk_swapchain->images_count,
-    cg_core.vk_descriptor_set_layout->model);
+    BluCat::INT::core.vk_swapchain->images_count,
+    BluCat::INT::core.vk_descriptor_set_layout->model);
 
   VkDescriptorSetAllocateInfo alloc_info{};
   alloc_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
@@ -107,14 +107,14 @@ load_descriptor_sets(void *obj)
 void
 load_buffers_to_descriptor_sets(void *obj)
 {
-  auto self = static_cast<BluCat::StaticModel*>(obj);
+  auto self = static_cast<BluCat::GRA::StaticModel*>(obj);
 
   for(auto i{0}; i < self->uniform_buffers.size(); i++)
   {
     VkDescriptorBufferInfo buffer_info{};
     buffer_info.buffer = self->uniform_buffers[i].buffer;
     buffer_info.offset = 0;
-    buffer_info.range = sizeof(BluCat::UDOStaticModel);
+    buffer_info.range = sizeof(BluCat::GRA::UDOStaticModel);
 
     std::array<VkWriteDescriptorSet, 1> write_descriptors{};
     write_descriptors[0].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
@@ -128,7 +128,7 @@ load_buffers_to_descriptor_sets(void *obj)
     write_descriptors[0].pTexelBufferView = nullptr;
 
     vkUpdateDescriptorSets(
-      cg_core.vk_device_with_swapchain->device, write_descriptors.size(),
+      BluCat::INT::core.vk_device_with_swapchain->device, write_descriptors.size(),
       write_descriptors.data(), 0, nullptr);
   }
 }
@@ -142,7 +142,7 @@ static const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 StaticModel::StaticModel(
diff --git a/src/blucat/static_model.hpp b/src/blu_cat/gra/static_model.hpp
index 68c5ea1..0d689d0 100644
--- a/src/blucat/static_model.hpp
+++ b/src/blu_cat/gra/static_model.hpp
@@ -14,16 +14,16 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_STATIC_MODEL_H
-#define CANDY_GEAR_BLUCAT_STATIC_MODEL_H 1
+#ifndef BLU_CAT_GRA_STATIC_MODEL_H
+#define BLU_CAT_GRA_STATIC_MODEL_H 1
 
 #include <memory>
 #include <vector>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "static_mesh.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct StaticModel
@@ -46,4 +46,4 @@ struct StaticModel
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_STATIC_MODEL_H */
+#endif /* BLU_CAT_GRA_STATIC_MODEL_H */
diff --git a/src/blucat/swapchain.cpp b/src/blu_cat/gra/swapchain.cpp
index 1e521e4..f57e3c2 100644
--- a/src/blucat/swapchain.cpp
+++ b/src/blu_cat/gra/swapchain.cpp
@@ -16,7 +16,7 @@
 
 #include "swapchain.hpp"
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 
 #include <vector>
 
@@ -26,24 +26,25 @@ namespace
 void
 load_swapchain(void *obj)
 {
-  auto self = static_cast<BluCat::Swapchain*>(obj);
+  auto self = static_cast<BluCat::GRA::Swapchain*>(obj);
 
   // Surface formats.
   uint32_t vk_surface_format_count;
   std::vector<VkSurfaceFormatKHR> vk_surface_formats;
   vkGetPhysicalDeviceSurfaceFormatsKHR(
-    cg_core.vk_device_with_swapchain->physical_device, cg_core.window_surface,
-    &vk_surface_format_count, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->physical_device,
+		BluCat::INT::core.window_surface, &vk_surface_format_count, nullptr);
   vk_surface_formats.resize(vk_surface_format_count);
   vkGetPhysicalDeviceSurfaceFormatsKHR(
-    cg_core.vk_device_with_swapchain->physical_device, cg_core.window_surface,
-    &vk_surface_format_count, vk_surface_formats.data());
+    BluCat::INT::core.vk_device_with_swapchain->physical_device,
+		BluCat::INT::core.window_surface, &vk_surface_format_count,
+		vk_surface_formats.data());
 
   VkSwapchainCreateInfoKHR swapchain_create_info = {};
   swapchain_create_info.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
   swapchain_create_info.pNext = nullptr;
   swapchain_create_info.flags = 0;
-  swapchain_create_info.surface = cg_core.window_surface;
+  swapchain_create_info.surface = BluCat::INT::core.window_surface;
   swapchain_create_info.minImageCount = 3; // triple buffering.
 
   self->image_format = vk_surface_formats[0].format;
@@ -51,7 +52,7 @@ load_swapchain(void *obj)
   swapchain_create_info.imageColorSpace = vk_surface_formats[0].colorSpace;
 
   swapchain_create_info.imageExtent = {
-    cg_core.display_width, cg_core.display_height};
+    BluCat::INT::core.display_width, BluCat::INT::core.display_height};
   swapchain_create_info.imageArrayLayers = 1;
   swapchain_create_info.imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
   swapchain_create_info.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
@@ -64,33 +65,33 @@ load_swapchain(void *obj)
   swapchain_create_info.oldSwapchain = VK_NULL_HANDLE;
 
   if(vkCreateSwapchainKHR(
-       cg_core.vk_device_with_swapchain->device, &swapchain_create_info,
+       BluCat::INT::core.vk_device_with_swapchain->device, &swapchain_create_info,
        nullptr, &self->swapchain) != VK_SUCCESS)
     throw CommandError{"Vulkan failed to create swapchain."};
 
   vkGetSwapchainImagesKHR(
-    cg_core.vk_device_with_swapchain->device, self->swapchain,
+    BluCat::INT::core.vk_device_with_swapchain->device, self->swapchain,
     &self->images_count, nullptr);
   self->images = new VkImage[self->images_count];
   vkGetSwapchainImagesKHR(
-    cg_core.vk_device_with_swapchain->device, self->swapchain,
+    BluCat::INT::core.vk_device_with_swapchain->device, self->swapchain,
     &self->images_count, self->images);
 }
 
 void
 unload_swapchain(void *obj)
 {
-  auto self = static_cast<BluCat::Swapchain*>(obj);
+  auto self = static_cast<BluCat::GRA::Swapchain*>(obj);
 
   delete[] self->images;
   vkDestroySwapchainKHR(
-    cg_core.vk_device_with_swapchain->device, self->swapchain, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->swapchain, nullptr);
 }
 
 void
 load_image_view(void *obj)
 {
-  auto self = static_cast<BluCat::Swapchain*>(obj);
+  auto self = static_cast<BluCat::GRA::Swapchain*>(obj);
 
   self->image_views = new VkImageView[self->images_count];
   for(auto i{0}; i < self->images_count; i++)
@@ -111,7 +112,7 @@ load_image_view(void *obj)
     create_info.subresourceRange.layerCount = 1;
 
     if(vkCreateImageView(
-	 cg_core.vk_device_with_swapchain->device, &create_info, nullptr,
+	 BluCat::INT::core.vk_device_with_swapchain->device, &create_info, nullptr,
 	 &self->image_views[i]))
       throw CommandError{"Could no create Image View for swapchain."};
   }
@@ -120,17 +121,18 @@ load_image_view(void *obj)
 void
 unload_image_view(void *obj)
 {
-  auto self = static_cast<BluCat::Swapchain*>(obj);
+  auto self = static_cast<BluCat::GRA::Swapchain*>(obj);
 
   for(auto i{0}; i < self->images_count; i++)
     vkDestroyImageView(
-      cg_core.vk_device_with_swapchain->device, self->image_views[i], nullptr);
+      BluCat::INT::core.vk_device_with_swapchain->device, self->image_views[i],
+			nullptr);
 }
 
 void
 load_frame_sync(void *obj)
 {
-  auto self = static_cast<BluCat::Swapchain*>(obj);
+  auto self = static_cast<BluCat::GRA::Swapchain*>(obj);
 
   self->image_available_semaphores.resize(self->max_frames_in_flight);
   self->render_finished_semaphores.resize(self->max_frames_in_flight);
@@ -150,13 +152,14 @@ load_frame_sync(void *obj)
   for(auto i{0}; i < self->max_frames_in_flight; i++)
   {
     if(vkCreateSemaphore(
-	 cg_core.vk_device_with_swapchain->device, &semaphore_info,
+	 BluCat::INT::core.vk_device_with_swapchain->device, &semaphore_info,
 	 nullptr, &self->image_available_semaphores[i]) != VK_SUCCESS ||
        vkCreateSemaphore(
-	 cg_core.vk_device_with_swapchain->device, &semaphore_info,
+	 BluCat::INT::core.vk_device_with_swapchain->device, &semaphore_info,
 	 nullptr, &self->render_finished_semaphores[i]) != VK_SUCCESS ||
-       vkCreateFence(cg_core.vk_device_with_swapchain->device, &fence_info,
-                     nullptr, &self->in_flight_fences[i]) != VK_SUCCESS)
+       vkCreateFence(
+				 BluCat::INT::core.vk_device_with_swapchain->device, &fence_info,
+				 nullptr, &self->in_flight_fences[i]) != VK_SUCCESS)
       throw CommandError{"Failed to create semaphores."};
   }
 }
@@ -164,18 +167,18 @@ load_frame_sync(void *obj)
 void
 unload_frame_sync(void *obj)
 {
-  auto self = static_cast<BluCat::Swapchain*>(obj);
+  auto self = static_cast<BluCat::GRA::Swapchain*>(obj);
 
-  vkDeviceWaitIdle(cg_core.vk_device_with_swapchain->device);
+  vkDeviceWaitIdle(BluCat::INT::core.vk_device_with_swapchain->device);
 
   for(auto i{0}; i < self->max_frames_in_flight; i++)
   {
-    vkDestroySemaphore(cg_core.vk_device_with_swapchain->device,
+    vkDestroySemaphore(BluCat::INT::core.vk_device_with_swapchain->device,
                        self->render_finished_semaphores[i], nullptr);
-    vkDestroySemaphore(cg_core.vk_device_with_swapchain->device,
+    vkDestroySemaphore(BluCat::INT::core.vk_device_with_swapchain->device,
                        self->image_available_semaphores[i], nullptr);
-    vkDestroyFence(cg_core.vk_device_with_swapchain->device,
-		   self->in_flight_fences[i], nullptr);
+    vkDestroyFence(BluCat::INT::core.vk_device_with_swapchain->device,
+									 self->in_flight_fences[i], nullptr);
   }
 }
 
@@ -187,7 +190,7 @@ const CommandChain loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 Swapchain::Swapchain():
diff --git a/src/blucat/swapchain.hpp b/src/blu_cat/gra/swapchain.hpp
index 979fe08..2b52dd6 100644
--- a/src/blucat/swapchain.hpp
+++ b/src/blu_cat/gra/swapchain.hpp
@@ -14,13 +14,13 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_SWAPCHAIN_H
-#define CANDY_GEAR_BLUCAT_SWAPCHAIN_H 1
+#ifndef BLU_CAT_GRA_SWAPCHAIN_H
+#define BLU_CAT_GRA_SWAPCHAIN_H 1
 
-#include "core.hpp"
-#include "../command.hpp"
+#include "../com/command.hpp"
+#include "vulkan.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct Swapchain
@@ -44,4 +44,4 @@ struct Swapchain
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_SWAPCHAIN_H */
+#endif /* BLU_CAT_GRA_SWAPCHAIN_H */
diff --git a/src/blucat/texture.cpp b/src/blu_cat/gra/texture.cpp
index 1213528..7546d56 100644
--- a/src/blucat/texture.cpp
+++ b/src/blu_cat/gra/texture.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,8 +16,8 @@
 
 #include "texture.hpp"
 
-#include "../command.hpp"
-#include "../core.hpp"
+#include "../com/command.hpp"
+#include "../int/core.hpp"
 #include "image.hpp"
 #include "qoi.hpp"
 #include "source_buffer.hpp"
@@ -35,8 +35,8 @@ create_vulkan_image(
   vk_extent3d.height = height;
   vk_extent3d.depth = 1;
 
-  BluCat::Image::create(
-    cg_core.vk_device_with_swapchain,
+  BluCat::GRA::Image::create(
+    BluCat::INT::core.vk_device_with_swapchain,
     image,
     device_memory,
     VK_FORMAT_R8G8B8A8_UNORM,
@@ -48,24 +48,25 @@ create_vulkan_image(
 
 struct ImageBuilder
 {
-  BluCat::Texture *texture;
+  BluCat::GRA::Texture *texture;
 };
 
 struct ImageTextureBuilder: public ImageBuilder
 {
   std::string texture_path;
 
-  ImageTextureBuilder(BluCat::Texture *t, std::string tp);
-  ImageTextureBuilder(BluCat::Texture *t, const char* tp);
+  ImageTextureBuilder(BluCat::GRA::Texture *t, const std::string &tp);
+  ImageTextureBuilder(BluCat::GRA::Texture *t, const char* tp);
 };
 
-ImageTextureBuilder::ImageTextureBuilder(BluCat::Texture *t, std::string tp):
+ImageTextureBuilder::ImageTextureBuilder(
+	BluCat::GRA::Texture *t, const std::string &tp):
   texture_path{tp}
 {
   this->texture = t;
 }
 
-ImageTextureBuilder::ImageTextureBuilder(BluCat::Texture *t, const char* tp):
+ImageTextureBuilder::ImageTextureBuilder(BluCat::GRA::Texture *t, const char* tp):
   ImageTextureBuilder{t, std::string(tp)}
 {
 }
@@ -76,7 +77,7 @@ load_image(void *obj)
   auto self = static_cast<ImageTextureBuilder*>(obj);
 
   const int num_channels = 4; // all images are converted to RGBA
-  BluCat::QOI::Image qoi_image(self->texture_path.c_str(), num_channels);
+  BluCat::GRA::QOI::Image qoi_image(self->texture_path.c_str(), num_channels);
   uint8_t *pixels;
 
   { // Load file image from file.
@@ -90,8 +91,8 @@ load_image(void *obj)
   // Load file image into a vulkan buffer.
   size_t image_size{static_cast<size_t>(
       qoi_image.header.width * qoi_image.header.height * num_channels)};
-  BluCat::SourceBuffer source_image_buffer{
-    cg_core.vk_device_with_swapchain, pixels, image_size};
+  BluCat::GRA::SourceBuffer source_image_buffer{
+    BluCat::INT::core.vk_device_with_swapchain, pixels, image_size};
 
   { // Create vulkan image.
     try
@@ -103,7 +104,7 @@ load_image(void *obj)
         self->texture->height,
         self->texture->mip_levels);
     }
-    catch(BluCat::Image::Error error)
+    catch(BluCat::GRA::Image::Error error)
     {
       throw CommandError{error.what()};
     }
@@ -113,11 +114,11 @@ load_image(void *obj)
   {
     auto queue_family = self->texture->queue_family;
     auto queue{queue_family->get_queue()};
-    BluCat::CommandPool command_pool{queue_family, 1};
+    BluCat::GRA::CommandPool command_pool{queue_family, 1};
     VkCommandBuffer vk_command_buffer{command_pool.command_buffers[0]};
 
     queue.submit_one_time_command(vk_command_buffer, [&](){
-      BluCat::Image::move_image_state(
+      BluCat::GRA::Image::move_image_state(
 	vk_command_buffer, self->texture->image, VK_FORMAT_R8G8B8A8_UNORM,
 	0, VK_ACCESS_TRANSFER_WRITE_BIT,
 	VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
@@ -139,7 +140,7 @@ load_image(void *obj)
 	vk_command_buffer, source_image_buffer.buffer, self->texture->image,
 	VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, 1, &image_copy);
 
-      BluCat::Image::move_image_state(
+      BluCat::GRA::Image::move_image_state(
 	vk_command_buffer, self->texture->image, VK_FORMAT_R8G8B8A8_UNORM,
 	VK_ACCESS_TRANSFER_WRITE_BIT, VK_ACCESS_SHADER_READ_BIT,
 	VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
@@ -156,10 +157,11 @@ unload_image(void *obj)
   auto self = static_cast<ImageBuilder*>(obj);
 
   vkDestroyImage(
-    cg_core.vk_device_with_swapchain->device, self->texture->image, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->texture->image,
+		nullptr);
   vkFreeMemory(
-    cg_core.vk_device_with_swapchain->device, self->texture->device_memory,
-    nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device,
+		self->texture->device_memory, nullptr);
 }
 
 void
@@ -171,8 +173,8 @@ load_sampler(void *obj)
   sampler_info.sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO;
   sampler_info.pNext = nullptr;
   sampler_info.flags = 0;
-  sampler_info.magFilter = VK_FILTER_LINEAR;
-  sampler_info.minFilter = VK_FILTER_LINEAR;
+  sampler_info.magFilter = VK_FILTER_NEAREST;
+  sampler_info.minFilter = VK_FILTER_NEAREST;
   sampler_info.mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR;
   sampler_info.addressModeU = VK_SAMPLER_ADDRESS_MODE_REPEAT;
   sampler_info.addressModeV = VK_SAMPLER_ADDRESS_MODE_REPEAT;
@@ -188,7 +190,7 @@ load_sampler(void *obj)
   sampler_info.unnormalizedCoordinates = VK_FALSE;
 
   if(vkCreateSampler(
-       cg_core.vk_device_with_swapchain->device, &sampler_info, nullptr,
+       BluCat::INT::core.vk_device_with_swapchain->device, &sampler_info, nullptr,
        &self->texture->sampler) != VK_SUCCESS)
     throw CommandError{"Failed to create texture sampler."};
 }
@@ -199,7 +201,8 @@ unload_sampler(void *obj)
   auto self = static_cast<ImageBuilder*>(obj);
 
   vkDestroySampler(
-    cg_core.vk_device_with_swapchain->device, self->texture->sampler, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->texture->sampler,
+		nullptr);
 }
 
 void
@@ -209,12 +212,12 @@ load_view(void *obj)
 
   try
   {
-    BluCat::Image::create_view(
-      cg_core.vk_device_with_swapchain, &self->texture->view,
+    BluCat::GRA::Image::create_view(
+      BluCat::INT::core.vk_device_with_swapchain, &self->texture->view,
       self->texture->image,
       VK_FORMAT_R8G8B8A8_UNORM, VK_IMAGE_ASPECT_COLOR_BIT);
   }
-  catch(BluCat::Image::Error error)
+  catch(BluCat::GRA::Image::Error error)
   {
     throw CommandError{error.what()};
   }
@@ -226,7 +229,8 @@ unload_view(void *obj)
   auto self = static_cast<ImageBuilder*>(obj);
 
   vkDestroyImageView(
-    cg_core.vk_device_with_swapchain->device, self->texture->view, nullptr);
+    BluCat::INT::core.vk_device_with_swapchain->device, self->texture->view,
+		nullptr);
 }
 
 const CommandChain image_loader{
@@ -238,9 +242,9 @@ const CommandChain image_loader{
 struct CharacterToDraw
 {
   int pos_x;
-  std::shared_ptr<BluCat::Character> character;
+  std::shared_ptr<BluCat::GRA::Character> character;
 
-  CharacterToDraw(int x, std::shared_ptr<BluCat::Character> character):
+  CharacterToDraw(int x, std::shared_ptr<BluCat::GRA::Character> character):
     pos_x{x},
     character{character}
     {};
@@ -248,12 +252,12 @@ struct CharacterToDraw
 
 struct TextTextureBuilder: public ImageBuilder
 {
-  BluCat::Font *font;
+  BluCat::GRA::Font *font;
   const char* str;
   uint32_t max_bearing_y;
   std::vector<CharacterToDraw> chars_to_draw;
 
-  TextTextureBuilder(BluCat::Texture *texture, BluCat::Font *font, const char* str):
+  TextTextureBuilder(BluCat::GRA::Texture *texture, BluCat::GRA::Font *font, const char* str):
     font{font},
     str{str}
     {
@@ -267,7 +271,7 @@ load_text_proportions(void *obj)
   auto self = static_cast<TextTextureBuilder*>(obj);
 
   uint32_t texture_width{0}, texture_descender{0};
-  auto unicode_text{BluCat::Character::str_to_unicode(self->str)};
+  auto unicode_text{BluCat::GRA::Character::str_to_unicode(self->str)};
 
   auto first_image{self->font->character(unicode_text[0])};
   if(first_image->bearing_x < 0) texture_width = - first_image->bearing_x;
@@ -277,7 +281,7 @@ load_text_proportions(void *obj)
 
   // FIXME: I need to test several different fonts to find all bugs in this
   // code.
-  std::shared_ptr<BluCat::Character> char_image{};
+  std::shared_ptr<BluCat::GRA::Character> char_image{};
   { // Calculate image size
     int max_height;
     for(auto char_code : unicode_text)
@@ -330,8 +334,8 @@ load_text_image(void *obj)
       pixels[image_coord + 3] = 0; // Alpha
     }
   }
-  BluCat::SourceBuffer source_image_buffer{
-    cg_core.vk_device_with_swapchain, pixels.data(), image_size};
+  BluCat::GRA::SourceBuffer source_image_buffer{
+    BluCat::INT::core.vk_device_with_swapchain, pixels.data(), image_size};
 
   { // Create vulkan image.
     try
@@ -343,7 +347,7 @@ load_text_image(void *obj)
         self->texture->height,
         self->texture->mip_levels);
     }
-    catch(BluCat::Image::Error error)
+    catch(BluCat::GRA::Image::Error error)
     {
       throw CommandError{error.what()};
     }
@@ -351,13 +355,14 @@ load_text_image(void *obj)
 
   { // Render text
     auto queue_family{
-      cg_core.vk_device_with_swapchain->get_queue_family_with_presentation()};
+      BluCat::INT::core.vk_device_with_swapchain->
+			get_queue_family_with_presentation()};
     auto queue{queue_family->get_queue()};
-    BluCat::CommandPool command_pool{queue_family, 1};
+    BluCat::GRA::CommandPool command_pool{queue_family, 1};
     VkCommandBuffer vk_command_buffer{command_pool.command_buffers[0]};
 
     queue.submit_one_time_command(vk_command_buffer, [&](){
-      BluCat::Image::move_image_state(
+      BluCat::GRA::Image::move_image_state(
 	vk_command_buffer, self->texture->image, VK_FORMAT_R8G8B8A8_UNORM,
 	0, VK_ACCESS_TRANSFER_WRITE_BIT,
 	VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
@@ -410,7 +415,7 @@ load_text_image(void *obj)
           1, &image_copy);
       }
 
-      BluCat::Image::move_image_state(
+      BluCat::GRA::Image::move_image_state(
 	vk_command_buffer, self->texture->image, VK_FORMAT_R8G8B8A8_UNORM,
 	VK_ACCESS_TRANSFER_WRITE_BIT, VK_ACCESS_SHADER_READ_BIT,
 	VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
@@ -431,18 +436,18 @@ const CommandChain text_loader{
 void
 load_descriptor_set_pool(void *obj)
 {
-  auto self = static_cast<BluCat::Texture*>(obj);
+  auto self = static_cast<BluCat::GRA::Texture*>(obj);
 
   std::array<VkDescriptorPoolSize, 1> descriptor_pool_sizes{};
   descriptor_pool_sizes[0].type = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
   descriptor_pool_sizes[0].descriptorCount =
-    cg_core.vk_swapchain->images_count;
+    BluCat::INT::core.vk_swapchain->images_count;
 
   VkDescriptorPoolCreateInfo pool_info{};
   pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
   pool_info.pNext = nullptr;
   pool_info.flags = 0;
-  pool_info.maxSets = cg_core.vk_swapchain->images_count;
+  pool_info.maxSets = BluCat::INT::core.vk_swapchain->images_count;
   pool_info.poolSizeCount = descriptor_pool_sizes.size();
   pool_info.pPoolSizes = descriptor_pool_sizes.data();
 
@@ -455,7 +460,7 @@ load_descriptor_set_pool(void *obj)
 void
 unload_descriptor_set_pool(void *obj)
 {
-  auto self = static_cast<BluCat::Texture*>(obj);
+  auto self = static_cast<BluCat::GRA::Texture*>(obj);
 
   vkDestroyDescriptorPool(
     self->queue_family->device->device, self->descriptor_pool, nullptr);
@@ -464,11 +469,11 @@ unload_descriptor_set_pool(void *obj)
 void
 load_descriptor_sets(void *obj)
 {
-  auto self = static_cast<BluCat::Texture*>(obj);
+  auto self = static_cast<BluCat::GRA::Texture*>(obj);
 
   std::vector<VkDescriptorSetLayout> layouts(
-    cg_core.vk_swapchain->images_count,
-    cg_core.vk_descriptor_set_layout->texture);
+    BluCat::INT::core.vk_swapchain->images_count,
+    BluCat::INT::core.vk_descriptor_set_layout->texture);
 
   VkDescriptorSetAllocateInfo alloc_info{};
   alloc_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
@@ -486,9 +491,9 @@ load_descriptor_sets(void *obj)
 void
 load_data_to_descriptor_sets(void *obj)
 {
-  auto self = static_cast<BluCat::Texture*>(obj);
+  auto self = static_cast<BluCat::GRA::Texture*>(obj);
 
-  for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+  for(auto i{0}; i < BluCat::INT::core.vk_swapchain->images_count; i++)
   {
     VkDescriptorImageInfo image_info{};
     image_info.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
@@ -508,7 +513,7 @@ load_data_to_descriptor_sets(void *obj)
     write_descriptors[0].pTexelBufferView = nullptr;
 
     vkUpdateDescriptorSets(
-      cg_core.vk_device_with_swapchain->device, write_descriptors.size(),
+      BluCat::INT::core.vk_device_with_swapchain->device, write_descriptors.size(),
       write_descriptors.data(), 0, nullptr);
   }
 }
@@ -521,23 +526,25 @@ const CommandChain descriptor_loader{
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 Texture::Texture(Font *font, const char* str)
 {
   this->queue_family =
-    cg_core.vk_device_with_swapchain->get_queue_family_with_presentation();
+    BluCat::INT::core.vk_device_with_swapchain->
+		get_queue_family_with_presentation();
 
   TextTextureBuilder text_builder(this, font, str);
   text_loader.execute(&text_builder);
   descriptor_loader.execute(this);
 }
 
-Texture::Texture(std::string texture_path)
+Texture::Texture(const std::string &texture_path)
 {
   this->queue_family =
-    cg_core.vk_device_with_swapchain->get_queue_family_with_presentation();
+    BluCat::INT::core.vk_device_with_swapchain->
+		get_queue_family_with_presentation();
 
   ImageTextureBuilder texture_builder(this, texture_path);
   image_loader.execute(&texture_builder);
diff --git a/src/blucat/texture.hpp b/src/blu_cat/gra/texture.hpp
index bee61e6..c3da8cf 100644
--- a/src/blucat/texture.hpp
+++ b/src/blu_cat/gra/texture.hpp
@@ -14,16 +14,16 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_TEXTURE_H
-#define CANDY_GEAR_BLUCAT_TEXTURE_H 1
+#ifndef BLU_CAT_GRA_TEXTURE_H
+#define BLU_CAT_GRA_TEXTURE_H 1
 
 #include <string>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "font.hpp"
 #include "queue_family.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 struct Texture
@@ -41,11 +41,11 @@ struct Texture
   std::vector<VkDescriptorSet> descriptor_sets;
 
   Texture(Font *font, const char *str);
-  Texture(std::string texture_path);
+  Texture(const std::string &texture_path);
   Texture(const char* texture_path);
   ~Texture();
 };
 
 }
 
-#endif /* CANDY_GEAR_TEXTURE_H */
+#endif /* BLU_CAT_GRA_TEXTURE_H */
diff --git a/src/blucat/uniform_buffer.cpp b/src/blu_cat/gra/uniform_buffer.cpp
index 4b6194a..b176365 100644
--- a/src/blucat/uniform_buffer.cpp
+++ b/src/blu_cat/gra/uniform_buffer.cpp
@@ -19,7 +19,7 @@
 #include <cstring>
 #include <stdexcept>
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 UniformBuffer::UniformBuffer(Device *device, VkDeviceSize data_size)
diff --git a/src/blucat/uniform_buffer.hpp b/src/blu_cat/gra/uniform_buffer.hpp
index 2131ee1..f37e100 100644
--- a/src/blucat/uniform_buffer.hpp
+++ b/src/blu_cat/gra/uniform_buffer.hpp
@@ -14,16 +14,16 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_UNIFORM_BUFFER_H
-#define CANDY_GEAR_BLUCAT_UNIFORM_BUFFER_H 1
+#ifndef BLU_CAT_GRA_UNIFORM_BUFFER_H
+#define BLU_CAT_GRA_UNIFORM_BUFFER_H 1
 
 #include <memory>
 
-#include "core.hpp"
+#include "vulkan.hpp"
 
 #include "base_buffer.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 // FIXME: this class need to delete or create custom copy constructors!
@@ -46,4 +46,4 @@ public:
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_UNIFORM_BUFFER_H */
+#endif /* BLU_CAT_GRA_UNIFORM_BUFFER_H */
diff --git a/src/blucat/uniform_data_object.hpp b/src/blu_cat/gra/uniform_data_object.hpp
index d2292b1..68a3fbe 100644
--- a/src/blucat/uniform_data_object.hpp
+++ b/src/blu_cat/gra/uniform_data_object.hpp
@@ -14,13 +14,13 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_UNIFORM_DATA_OBJECT_H
-#define CANDY_GEAR_BLUCAT_UNIFORM_DATA_OBJECT_H 1
+#ifndef BLU_CAT_GRA_UNIFORM_DATA_OBJECT_H
+#define BLU_CAT_GRA_UNIFORM_DATA_OBJECT_H 1
 
-#include "core.hpp"
+#include "vulkan.hpp"
 #include "skeletal_mesh_vertex.hpp"
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
 // UDO = "uniform data object"
@@ -77,4 +77,4 @@ struct UDOSprite3D
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_UNIFORM_DATA_OBJECT_H */
+#endif /* BLU_CAT_GRA_UNIFORM_DATA_OBJECT_H */
diff --git a/src/blucat/view_3d.cpp b/src/blu_cat/gra/view.cpp
index 4b7b959..26017ce 100644
--- a/src/blucat/view_3d.cpp
+++ b/src/blu_cat/gra/view.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,27 +14,30 @@
  * limitations under the License.
  */
 
-#include "view_3d.hpp"
+#include "view.hpp"
 
 #include <array>
 
-#include "../core.hpp"
+#include "../int/core.hpp"
 #include "uniform_data_object.hpp"
 
+#include <iostream>
+
 namespace
 {
 
 void
-load_3d_uniform_buffer(void *obj)
+load_uniform_buffer(void *obj)
 {
-  auto self = static_cast<BluCat::View3D*>(obj);
+  auto self = static_cast<BluCat::GRA::View*>(obj);
 
   try
   {
-    self->ub_3d.reserve(cg_core.vk_swapchain->images_count);
-    for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
+    self->ub_3d.reserve(BluCat::INT::core.vk_swapchain->images_count);
+    for(auto i{0}; i < BluCat::INT::core.vk_swapchain->images_count; i++)
       self->ub_3d.emplace_back(
-	cg_core.vk_device_with_swapchain, sizeof(BluCat::UDOView3D));
+				BluCat::INT::core.vk_device_with_swapchain,
+				sizeof(BluCat::GRA::UDOView3D));
   }
   catch(const std::exception& e)
   {
@@ -43,21 +46,21 @@ load_3d_uniform_buffer(void *obj)
 }
 
 void
-unload_3d_uniform_buffer(void *obj)
+unload_uniform_buffer(void *obj)
 {
-  auto self = static_cast<BluCat::View3D*>(obj);
+  auto self = static_cast<BluCat::GRA::View*>(obj);
 
   self->ub_3d.clear();
 }
 
 void
-load_descriptor_sets_3d(void *obj)
+load_descriptor_sets(void *obj)
 {
-  auto self = static_cast<BluCat::View3D*>(obj);
+  auto self = static_cast<BluCat::GRA::View*>(obj);
 
   std::vector<VkDescriptorSetLayout> layouts(
-    cg_core.vk_swapchain->images_count,
-    cg_core.vk_descriptor_set_layout->view);
+    BluCat::INT::core.vk_swapchain->images_count,
+    BluCat::INT::core.vk_descriptor_set_layout->view);
 
   VkDescriptorSetAllocateInfo alloc_info{};
   alloc_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
@@ -65,28 +68,28 @@ load_descriptor_sets_3d(void *obj)
   alloc_info.descriptorSetCount = layouts.size();
   alloc_info.pSetLayouts = layouts.data();
 
-  self->descriptor_sets_3d.resize(layouts.size());
+  self->descriptor_sets.resize(layouts.size());
   if(vkAllocateDescriptorSets(
-       cg_core.vk_device_with_swapchain->device, &alloc_info,
-       self->descriptor_sets_3d.data()) != VK_SUCCESS)
+       BluCat::INT::core.vk_device_with_swapchain->device, &alloc_info,
+       self->descriptor_sets.data()) != VK_SUCCESS)
     throw CommandError{"Failed to create Vulkan descriptor sets for view."};
 }
 
 void
-load_resources_to_descriptor_sets_3d(void *obj)
+load_resources_to_descriptor_sets(void *obj)
 {
-  auto self = static_cast<BluCat::View3D*>(obj);
+  auto self = static_cast<BluCat::GRA::View*>(obj);
 
   for(auto i{0}; i < self->ub_3d.size(); i++)
   {
     VkDescriptorBufferInfo view_3d_info{};
     view_3d_info.buffer = self->ub_3d[i].buffer;
     view_3d_info.offset = 0;
-    view_3d_info.range = sizeof(BluCat::UDOView3D);
+    view_3d_info.range = sizeof(BluCat::GRA::UDOView3D);
 
     std::array<VkWriteDescriptorSet, 1> write_descriptors{};
     write_descriptors[0].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
-    write_descriptors[0].dstSet = self->descriptor_sets_3d[i];
+    write_descriptors[0].dstSet = self->descriptor_sets[i];
     write_descriptors[0].dstBinding = 0;
     write_descriptors[0].dstArrayElement = 0;
     write_descriptors[0].descriptorCount = 1;
@@ -96,60 +99,60 @@ load_resources_to_descriptor_sets_3d(void *obj)
     write_descriptors[0].pTexelBufferView = nullptr;
 
     vkUpdateDescriptorSets(
-      cg_core.vk_device_with_swapchain->device, write_descriptors.size(),
-      write_descriptors.data(), 0, nullptr);
+      BluCat::INT::core.vk_device_with_swapchain->device,
+			write_descriptors.size(), write_descriptors.data(), 0, nullptr);
   }
 }
 
 const CommandChain loader{
-  {&load_3d_uniform_buffer, &unload_3d_uniform_buffer}
+  {&load_uniform_buffer, &unload_uniform_buffer}
 };
 
 const CommandChain descriptor_sets_loader{
-  {&load_descriptor_sets_3d, nullptr},
-  {&load_resources_to_descriptor_sets_3d, nullptr}
+  {&load_descriptor_sets, nullptr},
+  {&load_resources_to_descriptor_sets, nullptr}
 };
 
 }
 
-namespace BluCat
+namespace BluCat::GRA
 {
 
-View3D::View3D(
-  glm::vec4 region, float projection_width, float projection_height):
-  View2D{region, projection_width, projection_height},
+View::View(
+	glm::vec4 region, float projection_width,
+	float projection_height):
+  region{region},
+	projection_width{projection_width},
+	projection_height{projection_height},
   field_of_view{45.0f},
+	descriptor_pool{VK_NULL_HANDLE},
   camera_position{std::make_shared<glm::vec3>(0.0f, 0.0f, 0.0f)},
   camera_orientation{std::make_shared<glm::quat>(0.0f, 0.0f, 0.0f, 0.0f)}
 {
-  ::loader.execute(this);
+  loader.execute(this);
 }
 
-View3D::~View3D()
+View::~View()
 {
-  ::loader.revert(this);
+  loader.revert(this);
 }
 
 void
-View3D::load_descriptor_sets(VkDescriptorPool descriptor_pool)
+View::load_descriptor_sets(VkDescriptorPool descriptor_pool)
 {
   if(this->descriptor_pool != VK_NULL_HANDLE) return;
 
-  auto parent = dynamic_cast<BluCat::View2D*>(this);
   this->descriptor_pool = descriptor_pool;
-  View2D::descriptor_sets_loader.execute(parent);
   ::descriptor_sets_loader.execute(this);
 }
 
 void
-View3D::unload_descriptor_sets()
+View::unload_descriptor_sets()
 {
   if(this->descriptor_pool == VK_NULL_HANDLE) return;
 
-  auto parent = dynamic_cast<BluCat::View2D*>(this);
   this->descriptor_pool = VK_NULL_HANDLE;
   ::descriptor_sets_loader.revert(this);
-  View2D::descriptor_sets_loader.revert(parent);
 }
 
 }
diff --git a/src/blucat/view_3d.hpp b/src/blu_cat/gra/view.hpp
index 05cae6b..a61ac34 100644
--- a/src/blucat/view_3d.hpp
+++ b/src/blu_cat/gra/view.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,35 +14,42 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_BLUCAT_VIEW_3D_H
-#define CANDY_GEAR_BLUCAT_VIEW_3D_H 1
+#ifndef BLU_CAT_GRA_VIEW_H
+#define BLU_CAT_GRA_VIEW_H 1
 
-#include "view_2d.hpp"
+#include <memory>
+#include <unordered_map>
+#include <vector>
 
-namespace BluCat
+#include "vulkan.hpp"
+#include "uniform_buffer.hpp"
+
+namespace BluCat::GRA
 {
 
-struct View3D: public View2D
+struct View
 {
-  float field_of_view;
+	glm::vec4 region;
+  float field_of_view, projection_width, projection_height;
+
   // FIXME: if this vector get resized, it can cause a segmentation fault!
   std::vector<UniformBuffer> ub_3d;
 
-  std::vector<VkDescriptorSet> descriptor_sets_3d;
+  VkDescriptorPool descriptor_pool;
+  std::vector<VkDescriptorSet> descriptor_sets;
 
   std::shared_ptr<glm::vec3> camera_position;
   std::shared_ptr<glm::quat> camera_orientation;
 
-  View3D(glm::vec4 region, float projection_width, float projection_height);
-  ~View3D();
-
   void
   load_descriptor_sets(VkDescriptorPool descriptor_pool);
-
   void
   unload_descriptor_sets();
+
+  View(glm::vec4 region, float projection_width, float projection_height);
+  ~View();
 };
 
 }
 
-#endif /* CANDY_GEAR_BLUCAT_VIEW_3D_H */
+#endif /* BLU_CAT_GRA_VIEW_H */
diff --git a/src/blu_cat/gra/vulkan.hpp b/src/blu_cat/gra/vulkan.hpp
new file mode 100644
index 0000000..73c599f
--- /dev/null
+++ b/src/blu_cat/gra/vulkan.hpp
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BLU_CAT_GRA_VULKAN_H
+#define BLU_CAT_GRA_VULKAN_H 1
+
+#include "../com/numbers.hpp"
+
+#include <vulkan/vulkan.h>
+
+#endif /* BLU_CAT_GRA_VULKAN_H */
diff --git a/src/blu_cat/int/core.cpp b/src/blu_cat/int/core.cpp
new file mode 100644
index 0000000..7e78b89
--- /dev/null
+++ b/src/blu_cat/int/core.cpp
@@ -0,0 +1,761 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "core.hpp"
+
+namespace
+{
+
+#ifdef DEBUG
+VKAPI_ATTR VkBool32 VKAPI_CALL
+vk_debug_callback(
+	VkDebugUtilsMessageSeverityFlagBitsEXT message_severity,
+	VkDebugUtilsMessageTypeFlagsEXT message_type,
+	const VkDebugUtilsMessengerCallbackDataEXT* callback_data,
+	void* _obj)
+{
+	// Set level.
+	Log::Level log_level;
+	switch(message_severity)
+	{
+	case VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT:
+		log_level = Log::Level::Trace;
+		break;
+	case VK_DEBUG_UTILS_MESSAGE_SEVERITY_INFO_BIT_EXT:
+		log_level = Log::Level::Information;
+		break;
+	case VK_DEBUG_UTILS_MESSAGE_SEVERITY_WARNING_BIT_EXT:
+		log_level = Log::Level::Warning;
+		break;
+	case VK_DEBUG_UTILS_MESSAGE_SEVERITY_ERROR_BIT_EXT:
+	default:
+		log_level = Log::Level::Error;
+		break;
+	}
+
+	// Log message.
+	BluCat::INT::core.log.message(log_level, callback_data->pMessage);
+
+	return VK_FALSE;
+}
+#endif
+
+void
+load_sdl(void *obj)
+{
+	if(SDL_Init(SDL_INIT_EVERYTHING) < 0)
+	{
+		std::string error{"SDL could not initialize! SDL Error → "};
+		error += SDL_GetError();
+		throw error;
+	}
+
+	if(SDL_Vulkan_LoadLibrary(nullptr) != 0)
+	{
+		SDL_Quit();
+		std::string error{"SDL could not initialize Vulkan! SDL_Error → "};
+		error += SDL_GetError();
+		throw CommandError{error};
+	}
+}
+
+void
+unload_sdl(void *obj)
+{
+	SDL_Vulkan_UnloadLibrary();
+	SDL_Quit();
+}
+
+void
+load_sdl_mixer(void *obj)
+{
+	int flags = MIX_INIT_OGG|MIX_INIT_MOD;
+	int initted = Mix_Init(flags);
+	if(initted&flags != flags)
+	{
+		std::string error{"Could not initialize SDL mixer → "};
+		error += Mix_GetError();
+		throw CommandError{error};
+	}
+}
+
+void
+unload_sdl_mixer(void *obj)
+{
+	while(Mix_Init(0)) Mix_Quit();
+}
+
+void
+load_sdl_open_audio(void *obj)
+{
+	if(Mix_OpenAudio(22050, MIX_DEFAULT_FORMAT, 2, 1024) == -1)
+	{
+		std::string error{"Could not open SDL mixer audio → "};
+		error += Mix_GetError();
+		throw CommandError{error};
+	}
+}
+
+void
+unload_sdl_open_audio(void *obj)
+{
+	Mix_CloseAudio();
+}
+
+void
+load_window(void *obj)
+{
+	BluCat::INT::core.window = nullptr;
+	BluCat::INT::core.window = SDL_CreateWindow(
+		BluCat::INT::core.game_name.c_str(),
+		SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+		BluCat::INT::core.display_width, BluCat::INT::core.display_height,
+		SDL_WINDOW_VULKAN);
+	if(BluCat::INT::core.window == nullptr)
+	{
+		std::string error{"Window could not be created! SDL_Error → "};
+		error += SDL_GetError();
+		throw CommandError{error};
+	}
+}
+
+void
+unload_window(void *obj)
+{
+	SDL_DestroyWindow(BluCat::INT::core.window);
+}
+
+void
+load_vk_instance(void *obj)
+{
+	std::vector<const char*> vk_extensions;
+	std::vector<const char*> vk_required_layers_names;
+
+	// Get extensions.
+	{
+		uint32_t vk_extensions_count;
+		std::vector<const char*> vk_required_extensions;
+
+		// Load debuging layers.
+#ifdef DEBUG
+		vk_required_extensions.push_back(VK_EXT_DEBUG_UTILS_EXTENSION_NAME);
+		vk_required_layers_names.push_back("VK_LAYER_KHRONOS_validation");
+#endif
+
+		// Get extensions for SDL.
+		{
+			uint32_t vk_sdl_extension_count;
+			std::vector<const char*> vk_sdl_extensions;
+
+			if(!SDL_Vulkan_GetInstanceExtensions(
+					 BluCat::INT::core.window, &vk_sdl_extension_count, nullptr))
+			{
+				std::string error{
+					"Vulkan extensions could not be loaded by SDL! SDL_Error: "};
+				error += SDL_GetError();
+				throw CommandError{error};
+			}
+
+			vk_sdl_extensions.resize(vk_sdl_extension_count);
+			SDL_Vulkan_GetInstanceExtensions(
+				BluCat::INT::core.window, &vk_sdl_extension_count,
+				vk_sdl_extensions.data());
+
+			// Combine all extensions.
+			vk_extensions_count = vk_sdl_extension_count +
+				vk_required_extensions.size();
+			vk_extensions.resize(vk_extensions_count);
+			for(auto i{0}; i < vk_sdl_extension_count; i++)
+				vk_extensions[i] = vk_sdl_extensions[i];
+			for(auto i{0}; i < vk_required_extensions.size(); i++)
+				vk_extensions[i + vk_sdl_extension_count] = vk_required_extensions[i];
+		}
+
+#ifdef DEBUG
+		BluCat::INT::core.log.message(Log::Level::Trace, "Enabled VK extensions.");
+		for(auto vk_extension: vk_extensions)
+		{
+			std::string message{"Extension name: "};
+			message += vk_extension;
+			BluCat::INT::core.log.message(Log::Level::Trace, message);
+		}
+#endif
+	}
+
+	// Get available instance layers.
+	{
+		uint32_t vk_available_layers_count;
+		std::vector<VkLayerProperties> vk_available_layers;
+		std::vector<const char*> vk_available_layers_names;
+
+		vkEnumerateInstanceLayerProperties(&vk_available_layers_count, nullptr);
+		vk_available_layers.resize(vk_available_layers_count);
+		vkEnumerateInstanceLayerProperties(&vk_available_layers_count,
+																			 vk_available_layers.data());
+		vk_available_layers_names.resize(vk_available_layers_count);
+#ifdef DEBUG
+		BluCat::INT::core.log.message(
+			Log::Level::Trace, "Available VK instance layers.");
+#endif
+		for(uint32_t i = 0; i < vk_available_layers_count; i++)
+		{
+#ifdef DEBUG
+			std::stringstream message{};
+			message << "\nname: " << vk_available_layers[i].layerName << std::endl;
+			message << "Description: " << vk_available_layers[i].description <<
+				std::endl;
+			message << "Spec version: " << vk_available_layers[i].specVersion <<
+				std::endl;
+			message << "Implementation version: " <<
+				vk_available_layers[i].implementationVersion << std::endl;
+			BluCat::INT::core.log.message(Log::Level::Trace, message.str());
+#endif
+
+			vk_available_layers_names[i] = vk_available_layers[i].layerName;
+		}
+
+		// If required layers are not all available.
+		if(!std::includes(
+				 vk_available_layers_names.begin(), vk_available_layers_names.end(),
+				 vk_required_layers_names.begin(), vk_required_layers_names.begin()))
+			throw CommandError{"Some required Vulkan layers are not available."};
+	}
+
+	{
+		VkApplicationInfo app_info;
+		app_info.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
+		app_info.pNext = nullptr;
+		app_info.pApplicationName = BluCat::INT::core.game_name.c_str();
+		app_info.applicationVersion = VK_MAKE_VERSION(
+			BluCat::INT::core.game_version_major,
+			BluCat::INT::core.game_version_minor,
+			BluCat::INT::core.game_version_patch);
+		app_info.pEngineName = "BluCat::GRA";
+		app_info.engineVersion = VK_MAKE_VERSION(
+			BLU_CAT_VERSION_MAJOR,
+			BLU_CAT_VERSION_MINOR,
+			BLU_CAT_VERSION_PATCH);
+		app_info.apiVersion = VK_API_VERSION_1_0;
+
+		VkInstanceCreateInfo create_info;
+		create_info.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
+		create_info.pNext = nullptr;
+		create_info.flags = 0;
+		create_info.pApplicationInfo = &app_info;
+		create_info.enabledExtensionCount = vk_extensions.size();
+		create_info.ppEnabledExtensionNames = vk_extensions.data();
+		create_info.enabledLayerCount = vk_required_layers_names.size();
+		create_info.ppEnabledLayerNames = vk_required_layers_names.data();
+
+		VkResult result =
+			vkCreateInstance(&create_info, nullptr, &BluCat::INT::core.vk_instance);
+		if(result != VK_SUCCESS)
+		{
+			std::string error{""};
+			switch(result)
+			{
+			case VK_ERROR_LAYER_NOT_PRESENT:
+				error = " Layer not present.";
+				break;
+			case VK_ERROR_EXTENSION_NOT_PRESENT:
+				error = " Extension not present.";
+			}
+			error = "Failed to create Vulkan instance." + error;
+			throw CommandError{error};
+		}
+	}
+}
+
+void
+unload_vk_instance(void *obj)
+{
+	vkDestroyInstance(BluCat::INT::core.vk_instance, nullptr);
+}
+
+void
+load_window_surface(void *obj)
+{
+	if(!SDL_Vulkan_CreateSurface(
+			 BluCat::INT::core.window, BluCat::INT::core.vk_instance,
+			 &BluCat::INT::core.window_surface))
+	{
+		std::string error{"Failed to create a window surface → "};
+		error += SDL_GetError();
+		throw CommandError{error};
+	}
+}
+
+void
+unload_window_surface(void *obj)
+{
+	vkDestroySurfaceKHR(
+		BluCat::INT::core.vk_instance, BluCat::INT::core.window_surface, nullptr);
+}
+
+void
+load_threads(void *obj)
+{
+	auto num_threads{std::thread::hardware_concurrency() - 1};
+	for(auto i{0}; i < num_threads; i++)
+		BluCat::INT::core.threads.emplace_back(
+			BluCat::INT::core.workers.emplace_back(&BluCat::INT::core.job_queue));
+}
+
+void
+unload_threads(void *obj)
+{
+	BluCat::INT::core.job_queue.stop();
+	for(auto &t: BluCat::INT::core.threads) t.join();
+}
+
+void
+load_fps(void *obj)
+{
+  using namespace std::chrono;
+
+	BluCat::INT::core.max_frame_duration =
+		duration<long long, std::milli>(1000 / BluCat::INT::core.fps);
+	// FIXME: actually calculates the real delta time.
+	BluCat::INT::core.delta_time = 1.0f / BluCat::INT::core.fps;
+}
+
+void
+load_font_library(void *obj)
+{
+	FT_Error error{FT_Init_FreeType(&BluCat::INT::core.font_library)};
+	if(error) throw CommandError{"Failed to open the FreeType library."};
+}
+
+void
+unload_font_library(void *obj)
+{
+	FT_Done_FreeType(BluCat::INT::core.font_library);
+}
+
+#ifdef DEBUG
+void
+load_vk_debug_callback(void *obj)
+{
+  PFN_vkCreateDebugUtilsMessengerEXT debug_messenger;
+
+  // A Vulkan instance extension named VK_EXT_debug_utils and a Vulkan instance
+  // layer named VK_LAYER_LUNARG_standard_validation are required to enable
+  // this callback. These instance extension and instance layer are loaded at
+  // Instance::load_blucat_instance.
+  VkDebugUtilsMessengerCreateInfoEXT create_info;
+  create_info.sType = VK_STRUCTURE_TYPE_DEBUG_UTILS_MESSENGER_CREATE_INFO_EXT;
+  create_info.pNext = nullptr;
+  create_info.messageSeverity =
+      VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT |
+      VK_DEBUG_UTILS_MESSAGE_SEVERITY_INFO_BIT_EXT |
+      VK_DEBUG_UTILS_MESSAGE_SEVERITY_WARNING_BIT_EXT |
+      VK_DEBUG_UTILS_MESSAGE_SEVERITY_ERROR_BIT_EXT;
+  create_info.messageType = VK_DEBUG_UTILS_MESSAGE_TYPE_GENERAL_BIT_EXT |
+			    VK_DEBUG_UTILS_MESSAGE_TYPE_VALIDATION_BIT_EXT |
+			    VK_DEBUG_UTILS_MESSAGE_TYPE_PERFORMANCE_BIT_EXT;
+  create_info.pfnUserCallback = vk_debug_callback;
+  create_info.pUserData = nullptr;
+  create_info.flags = 0;
+
+  debug_messenger = (PFN_vkCreateDebugUtilsMessengerEXT)
+    vkGetInstanceProcAddr(BluCat::INT::core.vk_instance,
+			  "vkCreateDebugUtilsMessengerEXT");
+
+  if(debug_messenger(BluCat::INT::core.vk_instance, &create_info, nullptr,
+		     &BluCat::INT::core.vk_callback) != VK_SUCCESS)
+    CommandError{"Failed to setup debug callback for Vulkan."};
+}
+
+void
+unload_vk_debug_callback(void *obj)
+{
+  PFN_vkDestroyDebugUtilsMessengerEXT debug_messenger;
+
+  debug_messenger = (PFN_vkDestroyDebugUtilsMessengerEXT)
+    vkGetInstanceProcAddr(BluCat::INT::core.vk_instance,
+			  "vkDestroyDebugUtilsMessengerEXT");
+
+  debug_messenger(BluCat::INT::core.vk_instance, BluCat::INT::core.vk_callback, nullptr);
+}
+#endif
+
+void
+load_devices(void *obj)
+{
+  uint32_t devices_count;
+  std::vector<VkPhysicalDevice> vk_physical_devices;
+
+  // Enumerate physical devices
+  {
+    vkEnumeratePhysicalDevices(
+			BluCat::INT::core.vk_instance, &devices_count, nullptr);
+    if(devices_count < 1)
+      CommandError{"Failed to find GPUs with Vulkan support."};
+    vk_physical_devices.resize(devices_count);
+    vkEnumeratePhysicalDevices(
+      BluCat::INT::core.vk_instance, &devices_count, vk_physical_devices.data());
+  }
+
+#ifdef DEBUG
+  BluCat::INT::core.log.message(Log::Level::Trace, "Physical devices properties");
+#endif
+
+  BluCat::INT::core.vk_devices.reserve(devices_count);
+  for(auto i = 0; i < devices_count; i++)
+  {
+    // Use swapchain on first device.
+    if(i == 0)
+    {
+      BluCat::INT::core.vk_devices.emplace_back(vk_physical_devices[i], true);
+      BluCat::INT::core.vk_device_with_swapchain = &BluCat::INT::core.vk_devices[i];
+    }
+    else
+      BluCat::INT::core.vk_devices.emplace_back(vk_physical_devices[i], false);
+  }
+}
+
+void
+unload_devices(void *obj)
+{
+  BluCat::INT::core.vk_devices.clear();
+}
+
+static void
+load_swapchain(void *obj)
+{
+  try { BluCat::INT::core.vk_swapchain = new BluCat::GRA::Swapchain(); }
+  catch(const CommandError &error)
+  {
+    std::string error_message{"Failed to create swapchain → "};
+    error_message += error.what();
+    throw CommandError{error_message};
+  }
+}
+
+void
+unload_swapchain(void *obj)
+{
+  delete BluCat::INT::core.vk_swapchain;
+}
+
+void
+load_framebuffer(void *obj)
+{
+  try
+  {
+    BluCat::INT::core.vk_framebuffer = new BluCat::GRA::Framebuffer();
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to create framebuffer."};
+  }
+}
+
+void
+unload_framebuffer(void *obj)
+{
+  delete BluCat::INT::core.vk_framebuffer;
+}
+
+void
+load_render_pass(void *obj)
+{
+  try
+  {
+    BluCat::INT::core.vk_render_pass = new BluCat::GRA::RenderPass();
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to create render pass."};
+  }
+}
+
+void
+unload_render_pass(void *obj)
+{
+  delete BluCat::INT::core.vk_render_pass;
+}
+
+void
+load_descriptor_set_layout(void *obj)
+{
+  try
+  {
+    BluCat::INT::core.vk_descriptor_set_layout = new BluCat::GRA::DescriptorSetLayout();
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to create descriptor set layouts."};
+  }
+}
+
+void
+unload_descriptor_set_layout(void *obj)
+{
+  delete BluCat::INT::core.vk_descriptor_set_layout;
+}
+
+void
+load_graphics_pipeline_3d_layout(void *obj)
+{
+  try
+  {
+    BluCat::INT::core.vk_graphics_pipeline_3d_layout =
+      new BluCat::GRA::GraphicsPipeline3DLayout();
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to create 3d graphics pipeline."};
+  }
+}
+
+void
+unload_graphics_pipeline_3d_layout(void *obj)
+{
+  delete BluCat::INT::core.vk_graphics_pipeline_3d_layout;
+}
+
+void
+load_graphics_pipeline_2d_solid_layout(void *obj)
+{
+  try
+  {
+    BluCat::INT::core.vk_graphics_pipeline_2d_solid_layout =
+      new BluCat::GRA::GraphicsPipeline2DSolidLayout();
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to create 2d graphics pipeline."};
+  }
+}
+
+void
+unload_graphics_pipeline_2d_solid_layout(void *obj)
+{
+  delete BluCat::INT::core.vk_graphics_pipeline_2d_solid_layout;
+}
+
+void
+load_graphics_pipeline_2d_wired_layout(void *obj)
+{
+  try
+  {
+    BluCat::INT::core.vk_graphics_pipeline_2d_wired_layout =
+      new BluCat::GRA::GraphicsPipeline2DWiredLayout();
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to create 2d graphics pipeline."};
+  }
+}
+
+void
+unload_graphics_pipeline_2d_wired_layout(void *obj)
+{
+  delete BluCat::INT::core.vk_graphics_pipeline_2d_wired_layout;
+}
+
+void
+load_light(void *obj)
+{
+  try
+  {
+    BluCat::INT::core.vk_light = new BluCat::GRA::Light();
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to descriptor sets for light."};
+  }
+}
+
+void
+unload_light(void *obj)
+{
+  delete BluCat::INT::core.vk_light;
+}
+
+void
+load_graphics_pipeline_3d(void *obj)
+{
+  try
+  {
+    BluCat::INT::core.vk_graphics_pipeline_3d =
+      std::make_unique<BluCat::GRA::GraphicsPipeline3D>();
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to create 3d graphics pipeline."};
+  }
+}
+
+void
+unload_graphics_pipeline_3d(void *obj)
+{
+  BluCat::INT::core.vk_graphics_pipeline_3d = nullptr;
+}
+
+void
+load_graphics_pipeline_3d_skeletal(void *obj)
+{
+  try
+  {
+    BluCat::INT::core.vk_graphics_pipeline_3d_skeletal =
+      std::make_unique<BluCat::GRA::GraphicsPipeline3DSkeletal>();
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to create 3d skeletal graphics pipeline."};
+  }
+}
+
+void
+unload_graphics_pipeline_3d_skeletal(void *obj)
+{
+  BluCat::INT::core.vk_graphics_pipeline_3d_skeletal = nullptr;
+}
+
+void
+load_graphics_pipeline_sprite_3d(void *obj)
+{
+  try
+  {
+    BluCat::INT::core.vk_graphics_pipeline_sprite_3d =
+      std::make_unique<BluCat::GRA::GraphicsPipelineSprite3D>();
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to create sprite 3d graphics pipeline."};
+  }
+}
+
+void
+unload_graphics_pipeline_sprite_3d(void *obj)
+{
+  BluCat::INT::core.vk_graphics_pipeline_sprite_3d = nullptr;
+}
+
+void
+load_graphics_pipeline_2d_solid(void *obj)
+{
+  try
+  {
+    BluCat::INT::core.vk_graphics_pipeline_2d_solid =
+      std::make_unique<BluCat::GRA::GraphicsPipeline2DSolid>();
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to create 2d graphics pipeline."};
+  }
+}
+
+void
+unload_graphics_pipeline_2d_solid(void *obj)
+{
+  BluCat::INT::core.vk_graphics_pipeline_2d_solid = nullptr;
+}
+
+void
+load_graphics_pipeline_2d_wired(void *obj)
+{
+  try
+  {
+    BluCat::INT::core.vk_graphics_pipeline_2d_wired =
+      std::make_unique<BluCat::GRA::GraphicsPipeline2DWired>();
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to create 2d graphics pipeline."};
+  }
+}
+
+void
+unload_graphics_pipeline_2d_wired(void *obj)
+{
+  BluCat::INT::core.vk_graphics_pipeline_2d_wired = nullptr;
+}
+
+void
+load_renderer(void *obj)
+{
+  try
+  {
+		auto width{static_cast<float>(BluCat::INT::core.display_width)};
+		auto height{static_cast<float>(BluCat::INT::core.display_height)};
+    glm::vec4 region(
+      0.f, 0.f, width, height);
+		BluCat::INT::core.vk_renderer = new BluCat::GRA::Renderer(
+      {std::make_shared<BluCat::GRA::View>(region, region.z, region.w)},
+			width, height);
+  }
+  catch(const CommandError &e)
+  {
+    throw CommandError{"Failed to create renderer."};
+  }
+}
+
+void
+unload_renderer(void *obj)
+{
+  delete BluCat::INT::core.vk_renderer;
+}
+
+}
+
+namespace BluCat::INT
+{
+
+std::random_device random_seed;
+std::mt19937 random_number_generator;
+
+const CommandChain Core::loader{
+	{&load_sdl, &unload_sdl},
+	{&load_sdl_mixer, &unload_sdl_mixer},
+	{&load_sdl_open_audio, &unload_sdl_open_audio},
+	{&load_window, &unload_window},
+	{&load_vk_instance, &unload_vk_instance},
+	{&load_window_surface, &unload_window_surface},
+  {&load_threads, &unload_threads},
+  {&load_fps, nullptr},
+  {&load_font_library, &unload_font_library},
+#ifdef DEBUG
+  {&load_vk_debug_callback, &unload_vk_debug_callback},
+#endif
+  {&load_devices, &unload_devices},
+  {&load_swapchain, &unload_swapchain},
+
+  {&load_render_pass, &unload_render_pass},
+  {&load_framebuffer, &unload_framebuffer},
+  {&load_descriptor_set_layout, &unload_descriptor_set_layout},
+  {&load_graphics_pipeline_3d_layout,
+   &unload_graphics_pipeline_3d_layout},
+  {&load_graphics_pipeline_2d_solid_layout,
+   &unload_graphics_pipeline_2d_solid_layout},
+  {&load_graphics_pipeline_2d_wired_layout,
+   &unload_graphics_pipeline_2d_wired_layout},
+  {&load_light, &unload_light},
+	{&load_graphics_pipeline_3d_skeletal,
+	 &unload_graphics_pipeline_3d_skeletal},
+  {&load_graphics_pipeline_3d, &unload_graphics_pipeline_3d},
+  {&load_graphics_pipeline_sprite_3d,
+   &unload_graphics_pipeline_sprite_3d},
+  {&load_graphics_pipeline_2d_solid, &unload_graphics_pipeline_2d_solid},
+  {&load_graphics_pipeline_2d_wired, &unload_graphics_pipeline_2d_wired},
+  {&load_renderer, &unload_renderer},
+};
+
+Core core;
+
+}
diff --git a/src/blu_cat/int/core.hpp b/src/blu_cat/int/core.hpp
new file mode 100644
index 0000000..a334dfa
--- /dev/null
+++ b/src/blu_cat/int/core.hpp
@@ -0,0 +1,141 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BLU_CAT_INT_CORE_H
+#define BLU_CAT_INT_CORE_H 1
+
+#define BLU_CAT_VERSION_MAJOR 0
+#define BLU_CAT_VERSION_MINOR 1
+#define BLU_CAT_VERSION_PATCH 0
+
+#include <chrono>
+#include <cstdint>
+#include <memory>
+#include <random>
+
+#define SDL_MAIN_HANDLED
+
+#ifdef _WIN64
+#include <Windows.h>
+#endif
+
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_vulkan.h>
+#include <SDL2/SDL_mixer.h>
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+#include "../com/command.hpp"
+#include "../com/job_queue.hpp"
+#include "../com/worker.hpp"
+#include "../gra/device.hpp"
+#include "../gra/descriptor_set_layout.hpp"
+#include "../gra/framebuffer.hpp"
+#include "../gra/graphics_pipeline_2d_solid_layout.hpp"
+#include "../gra/graphics_pipeline_2d_wired_layout.hpp"
+#include "../gra/graphics_pipeline_2d_solid.hpp"
+#include "../gra/graphics_pipeline_2d_wired.hpp"
+#include "../gra/graphics_pipeline_3d_layout.hpp"
+#include "../gra/graphics_pipeline_3d.hpp"
+#include "../gra/graphics_pipeline_3d_skeletal.hpp"
+#include "../gra/graphics_pipeline_sprite_3d.hpp"
+#include "../gra/light.hpp"
+#include "../gra/log.hpp"
+#include "../gra/render_pass.hpp"
+#include "../gra/renderer.hpp"
+#include "../gra/swapchain.hpp"
+#include "../gra/vulkan.hpp"
+
+namespace BluCat::INT
+{
+
+extern std::random_device random_seed;
+extern std::mt19937 random_number_generator;
+
+struct Core
+{
+  static const CommandChain loader;
+
+  Log::Logger log;
+
+  COM::JobQueue job_queue;
+  std::vector<COM::Worker> workers;
+  std::vector<std::thread> threads;
+
+  /// Text displayed in the game window.
+	std::string game_name{"BluCat Game"};
+
+  /**
+   * @{
+   * This is the ammount of pixel that the games uses when rendering to the
+   * screen.
+   */
+	uint32_t display_width{800};
+	uint32_t display_height{600};
+  /// @}
+
+	int game_version_major{0};
+	int game_version_minor{1};
+	int game_version_patch{0};
+
+	uint32_t fps{30};
+  std::chrono::duration<long long, std::milli> max_frame_duration;
+  float delta_time;
+
+	SDL_Window *window;
+
+  FT_Library font_library;
+
+  VkSurfaceKHR window_surface;
+  VkInstance vk_instance;
+
+#ifdef DEBUG
+  VkDebugUtilsMessengerEXT vk_callback;
+#endif
+
+  // Vulkan devices.
+  std::vector<BluCat::GRA::Device> vk_devices;
+  BluCat::GRA::Device *vk_device_with_swapchain;
+  BluCat::GRA::Swapchain *vk_swapchain;
+
+  BluCat::GRA::Framebuffer *vk_framebuffer;
+  BluCat::GRA::RenderPass *vk_render_pass;
+  BluCat::GRA::DescriptorSetLayout *vk_descriptor_set_layout;
+  BluCat::GRA::GraphicsPipeline3DLayout *vk_graphics_pipeline_3d_layout;
+  BluCat::GRA::GraphicsPipeline2DSolidLayout
+	*vk_graphics_pipeline_2d_solid_layout;
+  BluCat::GRA::GraphicsPipeline2DWiredLayout
+	*vk_graphics_pipeline_2d_wired_layout;
+  BluCat::GRA::Light *vk_light;
+  std::unique_ptr<BluCat::GRA::GraphicsPipeline3D> vk_graphics_pipeline_3d;
+  std::unique_ptr<BluCat::GRA::GraphicsPipeline3DSkeletal>
+  vk_graphics_pipeline_3d_skeletal;
+  std::unique_ptr<BluCat::GRA::GraphicsPipelineSprite3D>
+	vk_graphics_pipeline_sprite_3d;
+  std::unique_ptr<BluCat::GRA::GraphicsPipeline2DSolid>
+	vk_graphics_pipeline_2d_solid;
+  std::unique_ptr<BluCat::GRA::GraphicsPipeline2DWired>
+	vk_graphics_pipeline_2d_wired;
+
+  BluCat::GRA::Renderer *vk_renderer;
+};
+
+extern Core core;
+
+}
+
+#endif /* BLU_CAT_INT_CORE_H */
diff --git a/src/blu_cat/net/client/client.cpp b/src/blu_cat/net/client/client.cpp
new file mode 100644
index 0000000..6ee6046
--- /dev/null
+++ b/src/blu_cat/net/client/client.cpp
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "client.hpp"
+
+namespace BluCat::NET
+{
+
+void
+Client::connect(const char *host, const UI16 port)
+{
+	if(this->connection) return;
+
+	asio::error_code error;
+	asio::ip::tcp::endpoint endpoint{asio::ip::make_address(host, error), port};
+
+	asio::ip::tcp::socket socket(this->io_context);
+	socket.connect(endpoint);
+
+	this->connection = new Connection(
+		this, this->io_context, std::move(socket), 0);
+
+	this->thread_context = std::thread([this](){this->io_context.run();});
+}
+
+void
+Client::disconnect(unsigned long index)
+{
+	if(!this->connection) return;
+
+	this->io_context.stop();
+	delete this->connection;
+	this->connection = nullptr;
+}
+
+Client::Client(const char *host, const UI16 port)
+{
+	this->connect(host, port);
+}
+
+Client::Client()
+{
+}
+
+Client::~Client()
+{
+	this->disconnect(0);
+	if(this->thread_context.joinable()) this->thread_context.join();
+}
+
+}
diff --git a/src/blu_cat/net/client/client.hpp b/src/blu_cat/net/client/client.hpp
new file mode 100644
index 0000000..ad0e298
--- /dev/null
+++ b/src/blu_cat/net/client/client.hpp
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BLU_CAT_NET_CLIENT_CLIENT_H
+#define BLU_CAT_NET_CLIENT_CLIENT_H 1
+
+#include "../../com/numbers.hpp"
+#include "../common/connection.hpp"
+#include "../common/connection_callback.hpp"
+
+namespace BluCat::NET
+{
+
+class Client: public ConnectionCallback
+{
+	asio::io_context io_context;
+	std::thread thread_context;
+
+	Connection *connection;
+
+public:
+	inline bool
+	send(const UI32 id, std::vector<UI8> &msg)
+		{return this->connection->send(id, msg);};
+
+	inline bool
+	read_message(Message *m)
+		{return this->connection->read_message(m);};
+
+	inline bool
+	is_connected()
+		{return this->connection != nullptr;};
+
+	void
+	connect(const char *host, const UI16 port);
+
+	void
+	disconnect(unsigned long index);
+
+	Client(
+		const char *host, const UI16 port);
+	Client();
+	~Client();
+};
+
+}
+
+#endif /* BLU_CAT_NET_CLIENT_CLIENT_H */
diff --git a/src/blu_cat/net/common/connection.cpp b/src/blu_cat/net/common/connection.cpp
new file mode 100644
index 0000000..643d30c
--- /dev/null
+++ b/src/blu_cat/net/common/connection.cpp
@@ -0,0 +1,133 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "connection.hpp"
+
+#include <iostream>
+
+namespace BluCat::NET
+{
+
+void
+Connection::read_header()
+{
+	asio::async_read(
+		this->socket, asio::buffer(
+			&this->reading_message.header, sizeof(MessageHeader)),
+		[this](std::error_code error, std::size_t length)
+		{
+			if(!error)
+			{
+				if(this->reading_message.header.size > 0)
+				{
+					this->reading_message.body.resize(this->reading_message.header.size);
+					this->read_body();
+				}
+				else
+				{
+					this->reading_message.body.resize(0);
+					this->messages.push_back(this->reading_message);
+					this->read_header();
+				}
+			}
+			else
+			{
+				std::cout << "Failed to read header: " << error.message() << std::endl;
+				this->connection_callback->disconnect(this->index);
+			}
+		});
+}
+
+void
+Connection::read_body()
+{
+	asio::async_read(
+		this->socket, asio::buffer(
+			this->reading_message.body.data(), this->reading_message.body.size()),
+		[this](std::error_code error, std::size_t length)
+		{
+			if(!error)
+			{
+				this->messages.push_back(this->reading_message);
+				this->read_header();
+			}
+			else
+			{
+				std::cout << "Failed to read body." << std::endl;
+				this->connection_callback->disconnect(this->index);
+			}
+		});
+}
+
+bool
+Connection::send(const uint32_t id, const std::vector<uint8_t> &msg)
+{
+	std::vector<uint8_t> *buffered_msg =
+		new std::vector<uint8_t>(msg.size() + 8);
+
+	{ // Create header
+		std::memcpy(buffered_msg->data(), &id, 4);
+
+		uint32_t size{static_cast<uint32_t>(msg.size())};
+		std::memcpy(buffered_msg->data() + 4, &size, 4);
+	}
+
+	// Append string to buffer.
+	copy(msg.begin(), msg.end(), buffered_msg->begin() + 8);
+
+	asio::async_write(
+		this->socket, asio::buffer(buffered_msg->data(), buffered_msg->size()),
+		[this, buffered_msg](std::error_code error, std::size_t length)
+		{
+			if(error)
+			{
+				std::cout << "Failed to send message: " << error.message() <<
+					std::endl;
+				this->connection_callback->disconnect(this->index);
+			}
+			delete buffered_msg;
+		});
+
+	return true;
+}
+
+bool
+Connection::read_message(Message *m)
+{
+	if(this->messages.size() <= 0) return false;
+
+	*m = std::move(this->messages.pop_back());
+	return true;
+}
+
+Connection::Connection(
+	ConnectionCallback *connection_callback,
+	asio::io_context &io_context, asio::ip::tcp::socket socket,
+	unsigned long index):
+	connection_callback{connection_callback},
+	io_context{io_context},
+	socket{std::move(socket)},
+	index{index}
+{
+	this->read_header();
+}
+
+Connection::~Connection()
+{
+	this->socket.close();
+}
+
+}
diff --git a/src/blu_cat/net/common/connection.hpp b/src/blu_cat/net/common/connection.hpp
new file mode 100644
index 0000000..bdce8b3
--- /dev/null
+++ b/src/blu_cat/net/common/connection.hpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BLU_CAT_NET_COMMON_CONNECTION_H
+#define BLU_CAT_NET_COMMON_CONNECTION_H 1
+
+#include <iostream>
+
+#define ASIO_STANDALONE
+#include <asio.hpp>
+#include <asio/ts/buffer.hpp>
+#include <asio/ts/internet.hpp>
+
+#include "connection_callback.hpp"
+#include "message.hpp"
+#include "tsqueue.hpp"
+
+namespace BluCat::NET
+{
+
+class Connection
+{
+protected:
+  unsigned long index;
+	asio::io_context &io_context;
+
+	asio::ip::tcp::socket socket;
+	TSQueue<Message> messages;
+
+	Message reading_message;
+	ConnectionCallback *connection_callback;
+
+	void
+	read_header();
+
+	void
+	read_body();
+
+public:
+	bool
+	send(const uint32_t id, const std::vector<uint8_t> &msg);
+
+	bool
+	read_message(Message *m);
+
+	Connection(ConnectionCallback *connection_callback,
+						 asio::io_context &io_context, asio::ip::tcp::socket socket,
+						 unsigned long index);
+
+	virtual
+	~Connection();
+};
+
+}
+
+#endif /* BLU_CAT_NET_COMMON_CONNECTION_H */
diff --git a/src/view_2d.hpp b/src/blu_cat/net/common/connection_callback.hpp
index a18937e..5241c76 100644
--- a/src/view_2d.hpp
+++ b/src/blu_cat/net/common/connection_callback.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,20 +14,26 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_VIEW_2D_H
-#define CANDY_GEAR_VIEW_2D_H 1
+#ifndef BLU_CAT_NET_COMMON_CONNECTION_CALLBACK_H
+#define BLU_CAT_NET_COMMON_CONNECTION_CALLBACK_H 1
 
-#include "core.hpp"
+#include <memory>
+#include <vector>
 
-extern const struct mrb_data_type cg_view_2d_type;
+namespace BluCat::NET
+{
 
-// Receives a mrb_value that points to a View2D or a View3D and returns a
-// pointer to View2D. If the mrb_value points to a View3D, the view will be
-// cast to a BluCat::View2D.
-BluCat::View2D*
-cg_cView_to_view_2d(mrb_state *mrb, mrb_value view_value);
+class Connection;
 
-void
-cg_view_2d_init(mrb_state *mrb);
+struct ConnectionCallback
+{
+	virtual void
+	disconnect(unsigned long index)=0;
 
-#endif /* CANDY_GEAR_VIEW_2D_H */
+	virtual
+	~ConnectionCallback(){};
+};
+
+}
+
+#endif /* BLU_CAT_NET_COMMON_CONNECTION_CALLBACK_H */
diff --git a/src/blu_cat/net/common/message.hpp b/src/blu_cat/net/common/message.hpp
new file mode 100644
index 0000000..286a3bc
--- /dev/null
+++ b/src/blu_cat/net/common/message.hpp
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BLU_CAT_NET_COMMON_MESSAGE_H
+#define BLU_CAT_NET_COMMON_MESSAGE_H 1
+
+#include <cstdint>
+#include <vector>
+
+namespace BluCat::NET
+{
+
+struct MessageHeader
+{
+	uint32_t id;
+	uint32_t size;
+};
+
+struct Message
+{
+	MessageHeader header{};
+	std::vector<uint8_t> body;
+};
+
+}
+
+#endif /* BLU_CAT_NET_COMMON_MESSAGE_H */
diff --git a/src/blu_cat/net/common/tsqueue.hpp b/src/blu_cat/net/common/tsqueue.hpp
new file mode 100644
index 0000000..673fe3c
--- /dev/null
+++ b/src/blu_cat/net/common/tsqueue.hpp
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BLU_CAT_NET_COMMON_TSQUEUE_H
+#define BLU_CAT_NET_COMMON_TSQUEUE_H 1
+
+#include <deque>
+#include <mutex>
+
+namespace BluCat::NET
+{
+
+template<typename T>
+class TSQueue
+{
+protected:
+	std::mutex mut;
+	std::deque<T> deq_queue;
+
+public:
+	TSQueue() = default;
+	TSQueue(const TSQueue<T>&) = delete;
+
+	const T&
+	front()
+	{
+		std::scoped_lock lock(this->mut);
+		return this->deq_queue.front();
+	}
+
+	const T&
+	back()
+	{
+		std::scoped_lock lock(this->mut);
+		return this->deq_queue.back();
+	}
+
+	void
+	push_front(const T& item)
+	{
+		std::scoped_lock lock(this->mut);
+		this->deq_queue.emplace_front(std::move(item));
+	}
+
+	void
+	push_back(const T& item)
+	{
+		std::scoped_lock lock(this->mut);
+		this->deq_queue.emplace_back(std::move(item));
+	}
+
+	size_t
+	size()
+	{
+		std::scoped_lock lock(this->mut);
+		return this->deq_queue.size();
+	}
+
+	void
+	clear()
+	{
+		std::scoped_lock lock(this->mut);
+		return this->deq_queue.clear();
+	}
+
+	T
+	pop_front()
+	{
+		std::scoped_lock lock(this->mut);
+		auto t = std::move(this->deq_queue.front());
+		deq_queue.pop_front();
+		return t;
+	}
+
+	T
+	pop_back()
+	{
+		std::scoped_lock lock(this->mut);
+		auto t = std::move(this->deq_queue.back());
+		deq_queue.pop_back();
+		return t;
+	}
+
+	virtual
+	~TSQueue()
+	{
+		this->clear();
+	}
+};
+
+}
+
+#endif /* BLU_CAT_NET_COMMON_TSQUEUE_H */
diff --git a/src/blu_cat/net/server/server.cpp b/src/blu_cat/net/server/server.cpp
new file mode 100644
index 0000000..b9d007e
--- /dev/null
+++ b/src/blu_cat/net/server/server.cpp
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "server.hpp"
+
+#include <iostream>
+
+namespace BluCat::NET
+{
+
+void
+Server::wait_for_client_connections()
+{
+	acceptor.async_accept(
+		[this](std::error_code error, asio::ip::tcp::socket socket)
+		{
+			if(!error)
+			{
+				std::scoped_lock lock(this->mut);
+
+				std::cout << "[SERVER] New connection: " << socket.remote_endpoint() <<
+					std::endl;
+
+				if(this->free_connection_slots.size() > 0)
+				{
+					unsigned long pos{this->free_connection_slots.front()};
+					this->free_connection_slots.pop();
+					std::cout << "Working " << pos << std::endl;
+					std::unique_ptr<Connection> new_connection(
+						std::make_unique<Connection>(
+							this, this->io_context, std::move(socket), pos));
+					this->connections[pos] = new_connection.get();
+					this->get_new_connection(std::move(new_connection));
+				}
+				else
+				{
+					unsigned long pos{this->connections.size()};
+					std::unique_ptr<Connection> new_connection(
+						std::make_unique<Connection>(
+							this, this->io_context, std::move(socket), pos));
+					this->connections.push_back(new_connection.get());
+					this->get_new_connection(std::move(new_connection));
+				}
+			}
+			else
+			{
+				std::cout << "error connecting to client." << std::endl;
+			}
+
+			std::cout << "num clients: " << connections.size() << std::endl;
+
+			this->wait_for_client_connections();
+		});
+}
+
+void
+Server::disconnect(unsigned long index)
+{
+	std::scoped_lock lock(this->mut);
+	delete this->connections[index];
+	this->connections[index] = nullptr;
+	this->free_connection_slots.push(index);
+}
+
+Server::Server(void (*get_new_connection)(std::unique_ptr<Connection> c),
+							 const uint16_t port):
+	get_new_connection{get_new_connection},
+	acceptor{io_context, asio::ip::tcp::endpoint(asio::ip::tcp::v4(), port)}
+{
+	this->thread_context = std::thread([this](){this->io_context.run();});
+	this->wait_for_client_connections();
+}
+
+Server::~Server()
+{
+	this->connections.clear();
+	this->io_context.stop();
+	if(this->thread_context.joinable()) thread_context.join();
+}
+
+}
diff --git a/src/blu_cat/net/server/server.hpp b/src/blu_cat/net/server/server.hpp
new file mode 100644
index 0000000..00b277f
--- /dev/null
+++ b/src/blu_cat/net/server/server.hpp
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BLU_CAT_SERVER_SERVER_H
+#define BLU_CAT_SERVER_SERVER_H 1
+
+#include <queue>
+
+#include "../common/connection.hpp"
+#include "../common/connection_callback.hpp"
+
+namespace BluCat::NET
+{
+
+class Server: public ConnectionCallback
+{
+	std::mutex mut;
+	asio::io_context io_context;
+	std::thread thread_context;
+	asio::ip::tcp::acceptor acceptor;
+	void (*get_new_connection)(std::unique_ptr<Connection> c);
+
+	std::queue<unsigned long> free_connection_slots;
+	std::vector<Connection*> connections;
+
+	void
+	wait_for_client_connections();
+
+public:
+	void
+	disconnect(unsigned long index);
+
+	Server(void (*get_new_connection)(std::unique_ptr<Connection> c),
+				 const uint16_t port);
+	~Server();
+};
+
+}
+
+#endif /* BLU_CAT_SERVER_SERVER_H */
diff --git a/src/blucat/skeletal_mesh.cpp b/src/blucat/skeletal_mesh.cpp
deleted file mode 100644
index baea635..0000000
--- a/src/blucat/skeletal_mesh.cpp
+++ /dev/null
@@ -1,204 +0,0 @@
-/*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "skeletal_mesh.hpp"
-
-#include "../binary_reader.hpp"
-#include "../command.hpp"
-#include "../core.hpp"
-#include "skeletal_mesh_vertex.hpp"
-
-namespace
-{
-
-// Data that is only needed for the command chain but not for the SkeletalMesh
-// goes here.
-struct MeshBuilder
-{
-  std::string mesh_path;
-  BluCat::SkeletalMesh *mesh;
-
-  MeshBuilder(BluCat::SkeletalMesh *m, std::string mp);
-  MeshBuilder(BluCat::SkeletalMesh *m, const char* mp);
-};
-
-MeshBuilder::MeshBuilder(BluCat::SkeletalMesh *m, std::string mp):
-  mesh{m},
-  mesh_path{mp}
-{
-}
-
-MeshBuilder::MeshBuilder(BluCat::SkeletalMesh *m, const char *mp):
-  MeshBuilder{m, std::string(mp)}
-{
-}
-
-void
-load_mesh(void *obj)
-{
-  auto self = static_cast<MeshBuilder*>(obj);
-
-  BinaryReader input{self->mesh_path};
-
-  self->mesh->queue_family =
-    cg_core.vk_device_with_swapchain->get_queue_family_with_graphics();
-
-  { // Load vertexes.
-    auto vertex_count{input.read_ui32()};
-    std::vector<BluCat::SkeletalMeshVertex> vertexes{vertex_count};
-
-    for(auto i{0}; i < vertex_count; i++)
-    {
-      vertexes[i].position = input.read_vec3();
-      vertexes[i].normal = input.read_vec3();
-      vertexes[i].texture_coord = input.read_vec2();
-
-      for(auto ii{0}; ii < BluCat::SKELETAL_MESH_MAX_NUM_OF_INFLUENCING_BONES;
-	  ii++)
-	vertexes[i].bone_ids[ii] = input.read_ui32();
-
-      for(auto ii{0}; ii < BluCat::SKELETAL_MESH_MAX_NUM_OF_INFLUENCING_BONES;
-	  ii++)
-	vertexes[i].bone_weights[ii] = input.read_float();
-    }
-
-    void *vertexes_data{vertexes.data()};
-    size_t vertexes_size = sizeof(vertexes[0]) * vertexes.size();
-    self->mesh->source_vertex_buffer = new BluCat::SourceBuffer{
-      self->mesh->queue_family->device, vertexes_data, vertexes_size};
-    self->mesh->vertex_buffer = new BluCat::DestinationBuffer{
-      self->mesh->queue_family, self->mesh->source_vertex_buffer,
-      VK_BUFFER_USAGE_VERTEX_BUFFER_BIT};
-  }
-
-  { // Load indexes.
-    self->mesh->index_count = input.read_ui32();
-    std::vector<uint32_t> indexes(self->mesh->index_count);
-
-    for(auto i{0}; i < self->mesh->index_count; i++)
-      indexes[i] = input.read_ui32();
-
-    void *indexes_data{indexes.data()};
-    size_t indexes_size{sizeof(indexes[0]) * indexes.size()};
-    BluCat::SourceBuffer source_index_buffer{
-      self->mesh->queue_family->device, indexes_data, indexes_size};
-    self->mesh->index_buffer = new BluCat::DestinationBuffer{
-      self->mesh->queue_family, &source_index_buffer,
-      VK_BUFFER_USAGE_INDEX_BUFFER_BIT};
-  }
-
-  { // Load bones
-    auto bone_count{input.read_ui32()};
-    self->mesh->bones.reserve(bone_count);
-    for(int i{0}; i < bone_count; i++)
-      self->mesh->bones.emplace_back(input.read_mat4());
-  }
-
-  { // Load animations
-    auto num_animations{input.read_ui32()};
-    self->mesh->animations.resize(num_animations);
-    for(uint32_t i{0}; i < num_animations; i++)
-    {
-      auto duration{input.read_double()};
-      self->mesh->animations[i].final_time = (float)duration;
-
-      auto ticks_per_second{input.read_double()};
-
-      auto num_bone_transforms{input.read_ui32()};
-      std::vector<BluCat::BoneTransform> *bone_transforms =
-	&(self->mesh->animations[i].bone_transforms);
-      bone_transforms->resize(num_bone_transforms);
-      for(uint32_t bone_transform_index{0};
-	  bone_transform_index < num_bone_transforms; bone_transform_index++)
-      {
-	auto bone_id{input.read_ui32()};
-
-	auto num_positions{input.read_ui32()};
-	BluCat::Channel<glm::vec3> *positions =
-	  &((*bone_transforms)[bone_transform_index].positions);
-	for(auto position_key_index{0}; position_key_index < num_positions;
-	    position_key_index++)
-	{
-	  auto vec3{input.read_vec3()};
-	  auto timestamp{input.read_double()};
-	  positions->key_frames.emplace_back(
-	    vec3, static_cast<float>(timestamp));
-	}
-
-	auto num_rotations{input.read_ui32()};
-	BluCat::Channel<glm::quat> *rotations =
-	  &((*bone_transforms)[bone_transform_index].rotations);
-	for(auto rotation_key_index{0}; rotation_key_index < num_rotations;
-	    rotation_key_index++)
-	{
-	  auto quat{input.read_quat()};
-	  auto timestamp{input.read_double()};
-	  rotations->key_frames.emplace_back(
-	    quat, static_cast<float>(timestamp));
-	}
-
-	auto num_scales{input.read_ui32()};
-	BluCat::Channel<glm::vec3> *scales =
-	  &((*bone_transforms)[bone_transform_index].scales);
-	for(auto scaling_key_index{0}; scaling_key_index < num_scales;
-	    scaling_key_index++)
-	{
-	  auto vec3{input.read_vec3()};
-	  auto timestamp{input.read_double()};
-	  scales->key_frames.emplace_back(vec3, static_cast<float>(timestamp));
-	}
-      }
-    }
-  }
-}
-
-void
-unload_mesh(void *obj)
-{
-  auto self = static_cast<MeshBuilder*>(obj);
-
-  delete self->mesh->index_buffer;
-  delete self->mesh->vertex_buffer;
-  delete self->mesh->source_vertex_buffer;
-}
-
-static const CommandChain loader{
-  {&load_mesh, &unload_mesh}
-};
-
-}
-
-namespace BluCat
-{
-
-SkeletalMesh::SkeletalMesh(std::string mesh_path)
-{
-  MeshBuilder mesh_builder(this, mesh_path);
-  loader.execute(&mesh_builder);
-}
-
-SkeletalMesh::SkeletalMesh(const char* mesh_path):
-  SkeletalMesh{std::string(mesh_path)}
-{
-}
-
-SkeletalMesh::~SkeletalMesh()
-{
-  MeshBuilder mesh_builder(this, "");
-  loader.revert(&mesh_builder);
-}
-
-}
diff --git a/src/blucat/view_2d.cpp b/src/blucat/view_2d.cpp
deleted file mode 100644
index f27b4c4..0000000
--- a/src/blucat/view_2d.cpp
+++ /dev/null
@@ -1,160 +0,0 @@
-/*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "view_2d.hpp"
-
-#include <array>
-
-#include "../core.hpp"
-#include "uniform_data_object.hpp"
-
-namespace
-{
-
-void
-load_2d_uniform_buffer(void *obj)
-{
-  auto self = static_cast<BluCat::View2D*>(obj);
-
-  try
-  {
-    self->ub_2d.reserve(cg_core.vk_swapchain->images_count);
-    for(auto i{0}; i < cg_core.vk_swapchain->images_count; i++)
-      self->ub_2d.emplace_back(
-	cg_core.vk_device_with_swapchain, sizeof(BluCat::UDOView2D));
-  }
-  catch(const std::exception& e)
-  {
-    throw CommandError{e.what()};
-  }
-}
-
-void
-unload_2d_uniform_buffer(void *obj)
-{
-  auto self = static_cast<BluCat::View2D*>(obj);
-
-  self->ub_2d.clear();
-}
-
-void
-load_descriptor_sets_2d(void *obj)
-{
-  auto self = static_cast<BluCat::View2D*>(obj);
-
-  std::vector<VkDescriptorSetLayout> layouts(
-    cg_core.vk_swapchain->images_count,
-    cg_core.vk_descriptor_set_layout->view);
-
-  VkDescriptorSetAllocateInfo alloc_info{};
-  alloc_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
-  alloc_info.descriptorPool = self->descriptor_pool;
-  alloc_info.descriptorSetCount = layouts.size();
-  alloc_info.pSetLayouts = layouts.data();
-
-  self->descriptor_sets_2d.resize(layouts.size());
-  if(vkAllocateDescriptorSets(
-       cg_core.vk_device_with_swapchain->device, &alloc_info,
-       self->descriptor_sets_2d.data()) != VK_SUCCESS)
-    throw CommandError{"Failed to create Vulkan descriptor sets for view."};
-}
-
-void
-load_resources_to_descriptor_sets_2d(void *obj)
-{
-  auto self = static_cast<BluCat::View2D*>(obj);
-
-  for(auto i{0}; i < self->ub_2d.size(); i++)
-  {
-    VkDescriptorBufferInfo view_2d_info{};
-    view_2d_info.buffer = self->ub_2d[i].buffer;
-    view_2d_info.offset = 0;
-    view_2d_info.range = sizeof(BluCat::UDOView2D);
-
-    std::array<VkWriteDescriptorSet, 1> write_descriptors{};
-    write_descriptors[0].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
-    write_descriptors[0].dstSet = self->descriptor_sets_2d[i];
-    write_descriptors[0].dstBinding = 0;
-    write_descriptors[0].dstArrayElement = 0;
-    write_descriptors[0].descriptorCount = 1;
-    write_descriptors[0].descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
-    write_descriptors[0].pBufferInfo = &view_2d_info;
-    write_descriptors[0].pImageInfo = nullptr;
-    write_descriptors[0].pTexelBufferView = nullptr;
-
-    vkUpdateDescriptorSets(
-      cg_core.vk_device_with_swapchain->device, write_descriptors.size(),
-      write_descriptors.data(), 0, nullptr);
-
-    BluCat::UDOView2D ubo_view_2d;
-    ubo_view_2d.proj = glm::ortho(
-      0.0f, self->projection_width,
-      0.0f, self->projection_height,
-      0.0f, 100.0f);
-    self->ub_2d[i].copy_data(&ubo_view_2d);
-  }
-}
-
-}
-
-namespace BluCat
-{
-
-const CommandChain View2D::loader{
-  {&load_2d_uniform_buffer, &unload_2d_uniform_buffer}
-};
-
-const CommandChain View2D::descriptor_sets_loader{
-  {&load_descriptor_sets_2d, nullptr},
-  {&load_resources_to_descriptor_sets_2d, nullptr}
-};
-
-View2D::View2D(
-  glm::vec4 region, float projection_width, float projection_height):
-  projection_width{projection_width},
-  projection_height{projection_height},
-  region{region},
-  descriptor_pool{VK_NULL_HANDLE},
-  rectangles_to_draw{cg_core.vk_swapchain->images_count},
-  sprites_to_draw{cg_core.vk_swapchain->images_count}
-{
-  loader.execute(this);
-}
-
-View2D::~View2D()
-{
-  loader.revert(this);
-}
-
-void
-View2D::load_descriptor_sets(VkDescriptorPool descriptor_pool)
-{
-  if(this->descriptor_pool != VK_NULL_HANDLE) return;
-
-  this->descriptor_pool = descriptor_pool;
-  descriptor_sets_loader.execute(this);
-}
-
-void
-View2D::unload_descriptor_sets()
-{
-  if(this->descriptor_pool == VK_NULL_HANDLE) return;
-
-  this->descriptor_pool = VK_NULL_HANDLE;
-  descriptor_sets_loader.revert(this);
-}
-
-}
diff --git a/src/blucat/view_2d.hpp b/src/blucat/view_2d.hpp
deleted file mode 100644
index b369334..0000000
--- a/src/blucat/view_2d.hpp
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef CANDY_GEAR_BLUCAT_VIEW_2D_H
-#define CANDY_GEAR_BLUCAT_VIEW_2D_H 1
-
-#include <memory>
-#include <unordered_map>
-#include <vector>
-
-#include "core.hpp"
-#include "sprite_to_draw.hpp"
-#include "rectangle.hpp"
-
-namespace BluCat
-{
-
-struct View2D
-{
-  glm::vec4 region;
-  float projection_width, projection_height;
-
-  // FIXME: if these vectors get resized, they can cause a segmentation fault!
-  std::vector<UniformBuffer> ub_2d;
-
-  VkDescriptorPool descriptor_pool;
-  std::vector<VkDescriptorSet> descriptor_sets_2d;
-
-  std::vector<std::vector<Rectangle>> rectangles_to_draw;
-  std::vector<std::vector<SpriteToDraw>> sprites_to_draw;
-
-  View2D(glm::vec4 region, float projection_width, float projection_height);
-  virtual ~View2D();
-
-  void
-  virtual load_descriptor_sets(VkDescriptorPool descriptor_pool);
-
-  void
-  virtual unload_descriptor_sets();
-
-protected:
-  static const CommandChain loader, descriptor_sets_loader;
-};
-
-}
-
-#endif /* CANDY_GEAR_BLUCAT_VIEW_2D_H */
diff --git a/src/candy_gear.cpp b/src/candy_gear/candy_gear.cpp
index 78bb716..7b5a9d9 100644
--- a/src/candy_gear.cpp
+++ b/src/candy_gear/candy_gear.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,8 +21,7 @@
 #include <mruby/string.h>
 
 #include "core.hpp"
-#include "view_2d.hpp"
-#include "view_3d.hpp"
+#include "view.hpp"
 
 static mrb_value
 cg_mCandyGear_set_game_name(mrb_state *mrb, mrb_value self)
@@ -30,46 +29,34 @@ cg_mCandyGear_set_game_name(mrb_state *mrb, mrb_value self)
   mrb_value name;
 
   mrb_get_args(mrb, "S", &name);
-  cg_core.game_name = RSTRING_PTR(name);
+  BluCat::INT::core.game_name = RSTRING_PTR(name);
 
   return self;
 }
 
 static mrb_value
-cg_mCandyGear_set_views(mrb_state *mrb, mrb_value self)
+cg_mCandyGear_change_views(mrb_state *mrb, mrb_value self)
 {
-  struct RClass *cg_m, *cg_cView2D, *cg_cView3D;
+  struct RClass *cg_m, *cg_cView;
   mrb_value *array;
   mrb_int array_len;
+	mrb_float width, height;
 
-  std::vector<std::shared_ptr<BluCat::View2D>> views_2d;
-  std::vector<std::shared_ptr<BluCat::View3D>> views_3d;
+  std::vector<std::shared_ptr<BluCat::GRA::View>> views;
 
   cg_m = mrb_module_get(mrb, "CandyGear");
-  cg_cView2D = mrb_class_get_under(mrb, cg_m, "View2D");
-  cg_cView3D = mrb_class_get_under(mrb, cg_m, "View3D");
+  cg_cView = mrb_class_get_under(mrb, cg_m, "View");
 
-  mrb_get_args(mrb, "a", &array, &array_len);
+  mrb_get_args(mrb, "aff", &array, &array_len, &width, &height);
   for(mrb_int i{0}; i < array_len; i++)
   {
-    if(mrb_obj_is_kind_of(mrb, array[i], cg_cView2D))
-    {
-      auto v = (std::shared_ptr<BluCat::View2D>*)DATA_PTR(array[i]);
-      views_2d.push_back(*v);
-    }
-    else if(mrb_obj_is_kind_of(mrb, array[i], cg_cView3D))
-    {
-      auto v = (std::shared_ptr<BluCat::View3D>*)DATA_PTR(array[i]);
-      views_3d.push_back(*v);
-    }
+		auto v = (std::shared_ptr<BluCat::GRA::View>*)DATA_PTR(array[i]);
+		views.push_back(*v);
   }
 
-  // A Renderer need at least one view to work.
-  if(views_2d.size() > 0 || views_3d.size() > 0)
-  {
-    delete cg_core.vk_renderer;
-    cg_core.vk_renderer = new BluCat::Renderer({views_2d, views_3d});
-  }
+	delete BluCat::INT::core.vk_renderer;
+	BluCat::INT::core.vk_renderer = new BluCat::GRA::Renderer(
+		{views, static_cast<F32>(width), static_cast<F32>(height)});
 
   return self;
 }
@@ -96,7 +83,7 @@ cg_mCandyGear_log(mrb_state *mrb, mrb_value self)
   else
     log_lvl = Log::Level::Fatal;
 
-  cg_core.log.message(log_lvl, message);
+  BluCat::INT::core.log.message(log_lvl, message);
 
   return self;
 }
@@ -138,7 +125,7 @@ cg_candy_gear_init(mrb_state *mrb)
   cg_m = mrb_module_get(mrb, "CandyGear");
 
   mrb_define_class_method(
-    mrb, cg_m, "views=", cg_mCandyGear_set_views, MRB_ARGS_REQ(1));
+    mrb, cg_m, "change_views", cg_mCandyGear_change_views, MRB_ARGS_REQ(3));
   mrb_define_class_method(
     mrb, cg_m, "log", cg_mCandyGear_log, MRB_ARGS_REQ(2));
   mrb_define_class_method(
diff --git a/src/candy_gear.hpp b/src/candy_gear/candy_gear.hpp
index 3ec92b3..3ec92b3 100644
--- a/src/candy_gear.hpp
+++ b/src/candy_gear/candy_gear.hpp
diff --git a/src/candy_gear/core.cpp b/src/candy_gear/core.cpp
new file mode 100644
index 0000000..0f5330c
--- /dev/null
+++ b/src/candy_gear/core.cpp
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "core.hpp"
+
+#include "candy_gear.hpp"
+#include "font.hpp"
+#include "graphic.hpp"
+#include "key.hpp"
+#include "orientation_3d.hpp"
+#include "skeletal_model.hpp"
+#include "skeletal_mesh.hpp"
+#include "static_model.hpp"
+#include "static_mesh.hpp"
+#include "sound.hpp"
+#include "sprite.hpp"
+#include "sprite_3d.hpp"
+#include "texture.hpp"
+#include "vector_3d.hpp"
+#include "vector_4d.hpp"
+#include "view.hpp"
+
+#ifdef DEBUG
+#include <sstream>
+#endif
+
+namespace
+{
+
+void
+load_mruby_symbols(void *obj)
+{
+  cg_core.sym_config = mrb_intern_cstr(cg_core.mrb, "config");
+  cg_core.sym_debug = mrb_intern_cstr(cg_core.mrb, "debug");
+  cg_core.sym_error = mrb_intern_cstr(cg_core.mrb, "error");
+  cg_core.sym_fatal = mrb_intern_cstr(cg_core.mrb, "fatal");
+  cg_core.sym_information = mrb_intern_cstr(cg_core.mrb, "information");
+  cg_core.sym_init = mrb_intern_cstr(cg_core.mrb, "init");
+  cg_core.sym_key_down = mrb_intern_cstr(cg_core.mrb, "key_down");
+  cg_core.sym_key_up = mrb_intern_cstr(cg_core.mrb, "key_up");
+  cg_core.sym_quit = mrb_intern_cstr(cg_core.mrb, "quit");
+  cg_core.sym_tick = mrb_intern_cstr(cg_core.mrb, "tick");
+  cg_core.sym_trace = mrb_intern_cstr(cg_core.mrb, "trace");
+  cg_core.sym_warning = mrb_intern_cstr(cg_core.mrb, "warning");
+}
+
+void
+load_game(void *obj)
+{
+  FILE *fp;
+  mrb_value main_obj{mrb_top_self(cg_core.mrb)};
+
+  mrb_define_module(cg_core.mrb, "CandyGear");
+  cg_candy_gear_init_config(cg_core.mrb);
+  cg_graphic_init_config(cg_core.mrb);
+
+  fp = fopen(cg_core.game_file.c_str(), "rb");
+  mrb_load_irep_file(cg_core.mrb, fp);
+  fclose(fp);
+  if (cg_core.mrb->exc)
+  {
+    mrb_print_error(cg_core.mrb);
+    throw CommandError{"Error loading game."};
+  }
+
+  mrb_funcall_id(cg_core.mrb, main_obj, cg_core.sym_config, 0);
+  if (cg_core.mrb->exc)
+  {
+    mrb_print_error(cg_core.mrb);
+    throw CommandError{"Error configuring game."};
+  }
+
+  cg_candy_gear_finish_config(cg_core.mrb);
+  cg_graphic_finish_config(cg_core.mrb);
+}
+
+void
+load_blucat(void *obj)
+{
+	BluCat::INT::core.loader.execute(nullptr);
+}
+
+void
+unload_blucat(void *obj)
+{
+	BluCat::INT::core.loader.revert(nullptr);
+}
+
+void
+load_mruby_interface(void *obj)
+{
+  cg_candy_gear_init(cg_core.mrb);
+  cg_font_init(cg_core.mrb);
+  cg_key_init(cg_core.mrb);
+  cg_orientation_3d_init(cg_core.mrb);
+  cg_skeletal_model_init(cg_core.mrb);
+  cg_skeletal_mesh_init(cg_core.mrb);
+  cg_static_model_init(cg_core.mrb);
+  cg_static_mesh_init(cg_core.mrb);
+  cg_sound_init(cg_core.mrb);
+  cg_sprite_init(cg_core.mrb);
+  cg_sprite_3d_init(cg_core.mrb);
+  cg_texture_init(cg_core.mrb);
+  cg_vector_3d_init(cg_core.mrb);
+  cg_vector_4d_init(cg_core.mrb);
+  cg_view_init(cg_core.mrb);
+}
+
+}
+
+const CommandChain cg_sCore::loader{
+  {&load_mruby_symbols, nullptr},
+  {&load_game, nullptr},
+	{&load_blucat, &unload_blucat},
+  {&load_mruby_interface, nullptr}
+};
diff --git a/src/candy_gear/core.hpp b/src/candy_gear/core.hpp
new file mode 100644
index 0000000..e3288b4
--- /dev/null
+++ b/src/candy_gear/core.hpp
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CANDY_GEAR_CORE_H
+#define CANDY_GEAR_CORE_H 1
+
+#include <mruby.h>
+#include <mruby/class.h>
+#include <mruby/compile.h>
+#include <mruby/data.h>
+#include <mruby/dump.h>
+#include <mruby/variable.h>
+
+#include "../blu_cat/int/core.hpp"
+
+/**
+ * The Core class stores all global states that the engine needs to work.
+ * Global variables are not evil if you use them carefully.
+ */
+struct cg_sCore
+{
+  static const CommandChain loader;
+
+  mrb_state *mrb;
+
+  std::string game_file;
+
+  /// mruby symbols
+  mrb_sym sym_config, sym_debug, sym_error, sym_fatal, sym_information,
+    sym_init, sym_key_down, sym_key_up, sym_quit, sym_tick, sym_trace,
+    sym_warning;
+
+  bool quit_game;
+};
+
+extern cg_sCore cg_core;
+
+#endif /* CANDY_GEAR_CORE_H */
diff --git a/src/font.cpp b/src/candy_gear/font.cpp
index 919d271..f9cbf44 100644
--- a/src/font.cpp
+++ b/src/candy_gear/font.cpp
@@ -16,12 +16,12 @@
 
 #include "font.hpp"
 
-#include "blucat/font.hpp"
+#include "../blu_cat/gra/font.hpp"
 
 void
 cg_free_font(mrb_state *mrb, void *obj)
 {
-  auto ptr = static_cast<BluCat::Font*>(obj);
+  auto ptr = static_cast<BluCat::GRA::Font*>(obj);
 
   ptr->~Font();
   mrb_free(mrb, ptr);
@@ -33,18 +33,18 @@ cg_font_type = {"CG_Font", cg_free_font};
 static mrb_value
 cg_cFont_initialize(mrb_state *mrb, mrb_value self)
 {
-  BluCat::Font *ptr;
+  BluCat::GRA::Font *ptr;
   const char *font_path;
   mrb_int font_size;
 
   mrb_get_args(mrb, "zi", &font_path, &font_size);
-  ptr = (BluCat::Font*)DATA_PTR(self);
+  ptr = (BluCat::GRA::Font*)DATA_PTR(self);
   if(ptr) mrb_free(mrb, ptr);
-  ptr = (BluCat::Font*)mrb_malloc(mrb, sizeof(BluCat::Font));
+  ptr = (BluCat::GRA::Font*)mrb_malloc(mrb, sizeof(BluCat::GRA::Font));
 
   try
   {
-    new(ptr)BluCat::Font(font_path, font_size);
+    new(ptr)BluCat::GRA::Font(font_path, font_size);
   }
   catch(const std::invalid_argument &e)
   {
diff --git a/src/font.hpp b/src/candy_gear/font.hpp
index 0128ea0..0128ea0 100644
--- a/src/font.hpp
+++ b/src/candy_gear/font.hpp
diff --git a/src/graphic.cpp b/src/candy_gear/graphic.cpp
index f27fff7..ad701d1 100644
--- a/src/graphic.cpp
+++ b/src/candy_gear/graphic.cpp
@@ -24,7 +24,7 @@ cg_mCandyGear_set_display_width(mrb_state *mrb, mrb_value self)
   mrb_int width;
 
   mrb_get_args(mrb, "i", &width);
-  cg_core.display_width = width;
+  BluCat::INT::core.display_width = width;
 
   return self;
 }
@@ -35,7 +35,7 @@ cg_mCandyGear_set_display_height(mrb_state *mrb, mrb_value self)
   mrb_int height;
 
   mrb_get_args(mrb, "i", &height);
-  cg_core.display_height = height;
+  BluCat::INT::core.display_height = height;
 
   return self;
 }
@@ -46,7 +46,7 @@ cg_mCandyGear_set_fps(mrb_state *mrb, mrb_value self)
   mrb_int fps;
 
   mrb_get_args(mrb, "i", &fps);
-  cg_core.fps = fps;
+  BluCat::INT::core.fps = fps;
 
   return self;
 }
diff --git a/src/graphic.hpp b/src/candy_gear/graphic.hpp
index fbd9df8..fbd9df8 100644
--- a/src/graphic.hpp
+++ b/src/candy_gear/graphic.hpp
diff --git a/src/key.cpp b/src/candy_gear/key.cpp
index 615119c..615119c 100644
--- a/src/key.cpp
+++ b/src/candy_gear/key.cpp
diff --git a/src/key.hpp b/src/candy_gear/key.hpp
index d3f4f5f..d3f4f5f 100644
--- a/src/key.hpp
+++ b/src/candy_gear/key.hpp
diff --git a/src/main.cpp b/src/candy_gear/main.cpp
index f99e8ca..353b6bf 100644
--- a/src/main.cpp
+++ b/src/candy_gear/main.cpp
@@ -18,6 +18,7 @@
 #include <thread>
 
 #include "core.hpp"
+
 cg_sCore cg_core;
 
 int main(int argc, char *argv[])
@@ -28,7 +29,7 @@ int main(int argc, char *argv[])
   SDL_Event event;
 
   // Random numbers
-  random_number_generator.seed(random_seed());
+  BluCat::INT::random_number_generator.seed(BluCat::INT::random_seed());
 
   cg_core.game_file = argv[1];
   cg_core.mrb = mrb_open();
@@ -36,7 +37,7 @@ int main(int argc, char *argv[])
   try{ cg_sCore::loader.execute(nullptr); }
   catch(const CommandError &error)
   {
-    cg_core.log.message(Log::Level::Fatal, error.what());
+    BluCat::INT::core.log.message(Log::Level::Fatal, error.what());
     mrb_close(cg_core.mrb);
     return 1;
   }
@@ -92,16 +93,15 @@ int main(int argc, char *argv[])
     }
     else
     {
-      cg_core.vk_renderer->draw();
+      BluCat::INT::core.vk_renderer->draw();
 
-      // Timer
-      {
+      { // Timer
         auto frame_stop = steady_clock::now();
         auto frame_duration = frame_stop - frame_start;
 
         // If frame take less time than maximum allowed.
-        if(cg_core.max_frame_duration > frame_duration)
-          sleep_for(cg_core.max_frame_duration - frame_duration);
+        if(BluCat::INT::core.max_frame_duration > frame_duration)
+          sleep_for(BluCat::INT::core.max_frame_duration - frame_duration);
 
         frame_start = frame_stop;
       }
diff --git a/src/orientation_3d.cpp b/src/candy_gear/orientation_3d.cpp
index cb42984..cb42984 100644
--- a/src/orientation_3d.cpp
+++ b/src/candy_gear/orientation_3d.cpp
diff --git a/src/orientation_3d.hpp b/src/candy_gear/orientation_3d.hpp
index 45a8ab2..45a8ab2 100644
--- a/src/orientation_3d.hpp
+++ b/src/candy_gear/orientation_3d.hpp
diff --git a/src/skeletal_mesh.cpp b/src/candy_gear/skeletal_mesh.cpp
index 90cbeee..4af4419 100644
--- a/src/skeletal_mesh.cpp
+++ b/src/candy_gear/skeletal_mesh.cpp
@@ -18,12 +18,12 @@
 
 #include "orientation_3d.hpp"
 #include "vector_3d.hpp"
-#include "blucat/skeletal_mesh.hpp"
+#include "../blu_cat/gra/skeletal_mesh.hpp"
 
 void
 cg_free_skeletal_mesh(mrb_state *mrb, void* obj)
 {
-  auto ptr = static_cast<std::shared_ptr<BluCat::SkeletalMesh>*>(obj);
+  auto ptr = static_cast<std::shared_ptr<BluCat::GRA::SkeletalMesh>*>(obj);
 
   ptr->~shared_ptr();
   mrb_free(mrb, ptr);
@@ -37,16 +37,16 @@ cg_cSkeletalMesh_initialize(mrb_state *mrb, mrb_value self)
 {
   const char *file_path;
 
-  std::shared_ptr<BluCat::SkeletalMesh> *ptr;
+  std::shared_ptr<BluCat::GRA::SkeletalMesh> *ptr;
 
   mrb_get_args(mrb, "z", &file_path);
-  ptr = (std::shared_ptr<BluCat::SkeletalMesh>*)DATA_PTR(self);
+  ptr = (std::shared_ptr<BluCat::GRA::SkeletalMesh>*)DATA_PTR(self);
   if(ptr) mrb_free(mrb, ptr);
-  ptr = (std::shared_ptr<BluCat::SkeletalMesh>*)mrb_malloc(
-    mrb, sizeof(std::shared_ptr<BluCat::SkeletalMesh>));
+  ptr = (std::shared_ptr<BluCat::GRA::SkeletalMesh>*)mrb_malloc(
+    mrb, sizeof(std::shared_ptr<BluCat::GRA::SkeletalMesh>));
 
-  new(ptr)std::shared_ptr<BluCat::SkeletalMesh>(
-    std::make_shared<BluCat::SkeletalMesh>(file_path));
+  new(ptr)std::shared_ptr<BluCat::GRA::SkeletalMesh>(
+    std::make_shared<BluCat::GRA::SkeletalMesh>(file_path));
 
   mrb_data_init(self, ptr, &cg_skeletal_mesh_type);
   return self;
diff --git a/src/skeletal_mesh.hpp b/src/candy_gear/skeletal_mesh.hpp
index 476aa9b..476aa9b 100644
--- a/src/skeletal_mesh.hpp
+++ b/src/candy_gear/skeletal_mesh.hpp
diff --git a/src/skeletal_model.cpp b/src/candy_gear/skeletal_model.cpp
index 3a3596e..41d0c9a 100644
--- a/src/skeletal_model.cpp
+++ b/src/candy_gear/skeletal_model.cpp
@@ -20,12 +20,12 @@
 #include "vector_3d.hpp"
 #include "skeletal_mesh.hpp"
 #include "texture.hpp"
-#include "blucat/skeletal_model.hpp"
+#include "../blu_cat/gra/skeletal_model.hpp"
 
 void
 cg_free_skeletal_model(mrb_state *mrb, void *obj)
 {
-  auto ptr = static_cast<std::shared_ptr<BluCat::SkeletalModel>*>(obj);
+  auto ptr = static_cast<std::shared_ptr<BluCat::GRA::SkeletalModel>*>(obj);
 
   ptr->~shared_ptr();
   mrb_free(mrb, ptr);
@@ -37,23 +37,23 @@ const struct mrb_data_type cg_skeletal_model_type = {
 static mrb_value
 cg_cSkeletalModel_initialize(mrb_state *mrb, mrb_value self)
 {
-  std::shared_ptr<BluCat::SkeletalMesh> *skeletal_mesh;
-  std::shared_ptr<BluCat::Texture> *texture;
+  std::shared_ptr<BluCat::GRA::SkeletalMesh> *skeletal_mesh;
+  std::shared_ptr<BluCat::GRA::Texture> *texture;
   std::shared_ptr<glm::vec3> *position;
   std::shared_ptr<glm::quat> *orientation;
-  std::shared_ptr<BluCat::SkeletalModel> *ptr;
+  std::shared_ptr<BluCat::GRA::SkeletalModel> *ptr;
 
   mrb_get_args(
     mrb, "dddd", &skeletal_mesh, &cg_skeletal_mesh_type, &texture,
     &cg_texture_type, &position, &cg_vector_3d_type, &orientation,
     &cg_orientation_3d_type);
-  ptr = (std::shared_ptr<BluCat::SkeletalModel>*)DATA_PTR(self);
+  ptr = (std::shared_ptr<BluCat::GRA::SkeletalModel>*)DATA_PTR(self);
   if(ptr) mrb_free(mrb, ptr);
-  ptr = (std::shared_ptr<BluCat::SkeletalModel>*)mrb_malloc(
-    mrb, sizeof(std::shared_ptr<BluCat::SkeletalModel>));
+  ptr = (std::shared_ptr<BluCat::GRA::SkeletalModel>*)mrb_malloc(
+    mrb, sizeof(std::shared_ptr<BluCat::GRA::SkeletalModel>));
 
-  new(ptr)std::shared_ptr<BluCat::SkeletalModel>(
-    std::make_shared<BluCat::SkeletalModel>(
+  new(ptr)std::shared_ptr<BluCat::GRA::SkeletalModel>(
+    std::make_shared<BluCat::GRA::SkeletalModel>(
       *skeletal_mesh, *texture, *position, *orientation));
 
   mrb_data_init(self, ptr, &cg_skeletal_model_type);
@@ -63,7 +63,7 @@ cg_cSkeletalModel_initialize(mrb_state *mrb, mrb_value self)
 static mrb_value
 cg_cSkeletalModel_set_orientation(mrb_state *mrb, mrb_value self)
 {
-  auto ptr = (std::shared_ptr<BluCat::SkeletalModel>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::SkeletalModel>*)DATA_PTR(self);
   std::shared_ptr<glm::quat> *orientation;
 
   mrb_get_args(mrb, "d", &orientation, &cg_orientation_3d_type);
@@ -75,7 +75,7 @@ cg_cSkeletalModel_set_orientation(mrb_state *mrb, mrb_value self)
 static mrb_value
 cg_cSkeletalModel_set_position(mrb_state *mrb, mrb_value self)
 {
-  auto ptr = (std::shared_ptr<BluCat::SkeletalModel>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::SkeletalModel>*)DATA_PTR(self);
   std::shared_ptr<glm::vec3> *position;
 
   mrb_get_args(mrb, "d", &position, &cg_vector_3d_type);
@@ -87,7 +87,7 @@ cg_cSkeletalModel_set_position(mrb_state *mrb, mrb_value self)
 static mrb_value
 cg_cSkeletalModel_set_animation(mrb_state *mrb, mrb_value self)
 {
-  auto ptr = (std::shared_ptr<BluCat::SkeletalModel>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::SkeletalModel>*)DATA_PTR(self);
   mrb_int animation_index;
 
   mrb_get_args(mrb, "i", &animation_index);
@@ -99,10 +99,10 @@ cg_cSkeletalModel_set_animation(mrb_state *mrb, mrb_value self)
 static mrb_value
 cg_cSkeletalModel_draw(mrb_state *mrb, mrb_value self)
 {
-  auto ptr = (std::shared_ptr<BluCat::SkeletalModel>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::SkeletalModel>*)DATA_PTR(self);
 
-  auto &instances = cg_core.vk_renderer->skeletal_models_to_draw[
-    cg_core.vk_swapchain->current_frame][(*ptr)->skeletal_mesh];
+  auto &instances = BluCat::INT::core.vk_renderer->skeletal_models_to_draw[
+    BluCat::INT::core.vk_swapchain->current_frame][(*ptr)->skeletal_mesh];
   instances.push_back(*ptr);
 
   return self;
diff --git a/src/skeletal_model.hpp b/src/candy_gear/skeletal_model.hpp
index 05f9c2e..05f9c2e 100644
--- a/src/skeletal_model.hpp
+++ b/src/candy_gear/skeletal_model.hpp
diff --git a/src/sound.cpp b/src/candy_gear/sound.cpp
index 0b3518f..0b3518f 100644
--- a/src/sound.cpp
+++ b/src/candy_gear/sound.cpp
diff --git a/src/sound.hpp b/src/candy_gear/sound.hpp
index 2f483e3..2f483e3 100644
--- a/src/sound.hpp
+++ b/src/candy_gear/sound.hpp
diff --git a/src/sprite.cpp b/src/candy_gear/sprite.cpp
index 65a49f7..2847d76 100644
--- a/src/sprite.cpp
+++ b/src/candy_gear/sprite.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,13 +18,12 @@
 
 #include "texture.hpp"
 #include "vector_4d.hpp"
-#include "view_2d.hpp"
-#include "blucat/sprite.hpp"
+#include "../blu_cat/gra/sprite.hpp"
 
 void
 cg_free_sprite(mrb_state *mrb, void* obj)
 {
-  auto ptr = static_cast<std::shared_ptr<BluCat::Sprite>*>(obj);
+  auto ptr = static_cast<std::shared_ptr<BluCat::GRA::Sprite>*>(obj);
 
   ptr->~shared_ptr();
   mrb_free(mrb, ptr);
@@ -37,22 +36,22 @@ cg_cSprite_initialize(mrb_state *mrb, mrb_value self)
 {
   mrb_float x, y, w, h;
   glm::vec4 vector_4d;
-  std::shared_ptr<BluCat::Texture> *texture;
-  std::shared_ptr<BluCat::Sprite> *ptr;
+  std::shared_ptr<BluCat::GRA::Texture> *texture;
+  std::shared_ptr<BluCat::GRA::Sprite> *ptr;
 
   mrb_get_args(
     mrb, "dffff", &texture, &cg_texture_type, &x, &y, &w, &h);
-  ptr = (std::shared_ptr<BluCat::Sprite>*)DATA_PTR(self);
+  ptr = (std::shared_ptr<BluCat::GRA::Sprite>*)DATA_PTR(self);
   if(ptr) mrb_free(mrb, ptr);
-  ptr = (std::shared_ptr<BluCat::Sprite>*)mrb_malloc(
-    mrb, sizeof(std::shared_ptr<BluCat::Sprite>));
+  ptr = (std::shared_ptr<BluCat::GRA::Sprite>*)mrb_malloc(
+    mrb, sizeof(std::shared_ptr<BluCat::GRA::Sprite>));
 
   vector_4d.x = x;
   vector_4d.y = y;
   vector_4d.z = w;
   vector_4d.w = h;
-  new(ptr)std::shared_ptr<BluCat::Sprite>(
-    std::make_shared<BluCat::Sprite>(*texture, vector_4d));
+  new(ptr)std::shared_ptr<BluCat::GRA::Sprite>(
+    std::make_shared<BluCat::GRA::Sprite>(*texture, vector_4d));
 
   mrb_data_init(self, ptr, &cg_sprite_type);
   return self;
@@ -61,18 +60,14 @@ cg_cSprite_initialize(mrb_state *mrb, mrb_value self)
 static mrb_value
 cg_cSprite_draw(mrb_state *mrb, mrb_value self)
 {
-  mrb_value view_value;
-  BluCat::View2D *view_2d;
   mrb_float x, y, w, h, z_index{0.0};
-  auto ptr = (std::shared_ptr<BluCat::Sprite>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::Sprite>*)DATA_PTR(self);
 
-  mrb_get_args(mrb, "offff|f", &view_value, &x, &y, &w, &h, &z_index);
-
-  view_2d = cg_cView_to_view_2d(mrb, view_value);
+  mrb_get_args(mrb, "ffff|f", &x, &y, &w, &h, &z_index);
 
   glm::vec4 rect(x, y, x + w, y + h);
-  auto &sprites_to_draw = view_2d->sprites_to_draw[
-    cg_core.vk_swapchain->current_frame];
+  auto &sprites_to_draw = BluCat::INT::core.vk_renderer->sprites_to_draw[
+    BluCat::INT::core.vk_swapchain->current_frame];
   sprites_to_draw.emplace_back(*ptr, rect, z_index);
 
   return self;
diff --git a/src/sprite.hpp b/src/candy_gear/sprite.hpp
index 528f2f7..528f2f7 100644
--- a/src/sprite.hpp
+++ b/src/candy_gear/sprite.hpp
diff --git a/src/sprite_3d.cpp b/src/candy_gear/sprite_3d.cpp
index d0e3319..d03b585 100644
--- a/src/sprite_3d.cpp
+++ b/src/candy_gear/sprite_3d.cpp
@@ -22,7 +22,7 @@
 void
 cg_free_sprite_3d(mrb_state *mrb, void *obj)
 {
-  auto ptr = static_cast<std::shared_ptr<BluCat::Sprite3D>*>(obj);
+  auto ptr = static_cast<std::shared_ptr<BluCat::GRA::Sprite3D>*>(obj);
 
   ptr->~shared_ptr();
   mrb_free(mrb, ptr);
@@ -34,21 +34,21 @@ const struct mrb_data_type cg_sprite_3d_type = {
 static mrb_value
 cg_cSprite3D_initialize(mrb_state *mrb, mrb_value self)
 {
-  std::shared_ptr<BluCat::Sprite> *sprite;
+  std::shared_ptr<BluCat::GRA::Sprite> *sprite;
   std::shared_ptr<glm::vec3> *position;
   mrb_float w, h;
-  std::shared_ptr<BluCat::Sprite3D> *ptr;
+  std::shared_ptr<BluCat::GRA::Sprite3D> *ptr;
 
   mrb_get_args(mrb, "ddff", &sprite, &cg_sprite_type,
 	       &position, &cg_vector_3d_type, &w, &h);
-  ptr = (std::shared_ptr<BluCat::Sprite3D>*)DATA_PTR(self);
+  ptr = (std::shared_ptr<BluCat::GRA::Sprite3D>*)DATA_PTR(self);
   if(ptr) mrb_free(mrb, ptr);
-  ptr = (std::shared_ptr<BluCat::Sprite3D>*)mrb_malloc(
-    mrb, sizeof(std::shared_ptr<BluCat::Sprite3D>));
+  ptr = (std::shared_ptr<BluCat::GRA::Sprite3D>*)mrb_malloc(
+    mrb, sizeof(std::shared_ptr<BluCat::GRA::Sprite3D>));
 
   glm::vec3 size{w, h, 0.0};
-  new(ptr)std::shared_ptr<BluCat::Sprite3D>(
-    std::make_shared<BluCat::Sprite3D>(*sprite, *position, size));
+  new(ptr)std::shared_ptr<BluCat::GRA::Sprite3D>(
+    std::make_shared<BluCat::GRA::Sprite3D>(*sprite, *position, size));
 
   mrb_data_init(self, ptr, &cg_sprite_3d_type);
   return self;
@@ -57,10 +57,10 @@ cg_cSprite3D_initialize(mrb_state *mrb, mrb_value self)
 static mrb_value
 cg_cSprite3D_draw(mrb_state *mrb, mrb_value self)
 {
-  auto ptr = (std::shared_ptr<BluCat::Sprite3D>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::Sprite3D>*)DATA_PTR(self);
 
-  auto &sprites_3d_to_draw = cg_core.vk_renderer->sprites_3d_to_draw[
-    cg_core.vk_swapchain->current_frame];
+  auto &sprites_3d_to_draw = BluCat::INT::core.vk_renderer->sprites_3d_to_draw[
+    BluCat::INT::core.vk_swapchain->current_frame];
   sprites_3d_to_draw.emplace_back(*ptr);
 
   return self;
diff --git a/src/sprite_3d.hpp b/src/candy_gear/sprite_3d.hpp
index 526c23a..526c23a 100644
--- a/src/sprite_3d.hpp
+++ b/src/candy_gear/sprite_3d.hpp
diff --git a/src/static_mesh.cpp b/src/candy_gear/static_mesh.cpp
index 3ae616e..9cb79ef 100644
--- a/src/static_mesh.cpp
+++ b/src/candy_gear/static_mesh.cpp
@@ -18,12 +18,12 @@
 
 #include "orientation_3d.hpp"
 #include "vector_3d.hpp"
-#include "blucat/static_mesh.hpp"
+#include "../blu_cat/gra/static_mesh.hpp"
 
 void
 cg_free_static_mesh(mrb_state *mrb, void* obj)
 {
-  auto ptr = static_cast<std::shared_ptr<BluCat::StaticMesh>*>(obj);
+  auto ptr = static_cast<std::shared_ptr<BluCat::GRA::StaticMesh>*>(obj);
 
   ptr->~shared_ptr();
   mrb_free(mrb, ptr);
@@ -37,16 +37,16 @@ cg_cStaticMesh_initialize(mrb_state *mrb, mrb_value self)
 {
   const char *file_path;
 
-  std::shared_ptr<BluCat::StaticMesh> *ptr;
+  std::shared_ptr<BluCat::GRA::StaticMesh> *ptr;
 
   mrb_get_args(mrb, "z", &file_path);
-  ptr = (std::shared_ptr<BluCat::StaticMesh>*)DATA_PTR(self);
+  ptr = (std::shared_ptr<BluCat::GRA::StaticMesh>*)DATA_PTR(self);
   if(ptr) mrb_free(mrb, ptr);
-  ptr = (std::shared_ptr<BluCat::StaticMesh>*)mrb_malloc(
-    mrb, sizeof(std::shared_ptr<BluCat::StaticMesh>));
+  ptr = (std::shared_ptr<BluCat::GRA::StaticMesh>*)mrb_malloc(
+    mrb, sizeof(std::shared_ptr<BluCat::GRA::StaticMesh>));
 
-  new(ptr)std::shared_ptr<BluCat::StaticMesh>(
-    std::make_shared<BluCat::StaticMesh>(file_path));
+  new(ptr)std::shared_ptr<BluCat::GRA::StaticMesh>(
+    std::make_shared<BluCat::GRA::StaticMesh>(file_path));
 
   mrb_data_init(self, ptr, &cg_static_mesh_type);
   return self;
diff --git a/src/static_mesh.hpp b/src/candy_gear/static_mesh.hpp
index 8f3b2d6..8f3b2d6 100644
--- a/src/static_mesh.hpp
+++ b/src/candy_gear/static_mesh.hpp
diff --git a/src/static_model.cpp b/src/candy_gear/static_model.cpp
index 3dd0c10..1a6eabe 100644
--- a/src/static_model.cpp
+++ b/src/candy_gear/static_model.cpp
@@ -20,12 +20,12 @@
 #include "static_mesh.hpp"
 #include "texture.hpp"
 #include "vector_3d.hpp"
-#include "blucat/static_model.hpp"
+#include "../blu_cat/gra/static_model.hpp"
 
 void
 cg_free_static_model(mrb_state *mrb, void *obj)
 {
-  auto ptr = static_cast<std::shared_ptr<BluCat::StaticModel>*>(obj);
+  auto ptr = static_cast<std::shared_ptr<BluCat::GRA::StaticModel>*>(obj);
 
   ptr->~shared_ptr();
   mrb_free(mrb, ptr);
@@ -37,23 +37,23 @@ const struct mrb_data_type cg_static_model_type = {
 static mrb_value
 cg_cStaticModel_initialize(mrb_state *mrb, mrb_value self)
 {
-  std::shared_ptr<BluCat::StaticMesh> *static_mesh;
-  std::shared_ptr<BluCat::Texture> *texture;
+  std::shared_ptr<BluCat::GRA::StaticMesh> *static_mesh;
+  std::shared_ptr<BluCat::GRA::Texture> *texture;
   std::shared_ptr<glm::vec3> *position;
   std::shared_ptr<glm::quat> *orientation;
-  std::shared_ptr<BluCat::StaticModel> *ptr;
+  std::shared_ptr<BluCat::GRA::StaticModel> *ptr;
 
   mrb_get_args(
     mrb, "dddd", &static_mesh, &cg_static_mesh_type, &texture,
     &cg_texture_type, &position, &cg_vector_3d_type, &orientation,
     &cg_orientation_3d_type);
-  ptr = (std::shared_ptr<BluCat::StaticModel>*)DATA_PTR(self);
+  ptr = (std::shared_ptr<BluCat::GRA::StaticModel>*)DATA_PTR(self);
   if(ptr) mrb_free(mrb, ptr);
-  ptr = (std::shared_ptr<BluCat::StaticModel>*)mrb_malloc(
-    mrb, sizeof(std::shared_ptr<BluCat::StaticModel>));
+  ptr = (std::shared_ptr<BluCat::GRA::StaticModel>*)mrb_malloc(
+    mrb, sizeof(std::shared_ptr<BluCat::GRA::StaticModel>));
 
-  new(ptr)std::shared_ptr<BluCat::StaticModel>(
-    std::make_shared<BluCat::StaticModel>(
+  new(ptr)std::shared_ptr<BluCat::GRA::StaticModel>(
+    std::make_shared<BluCat::GRA::StaticModel>(
       *static_mesh, *texture, *position, *orientation));
 
   mrb_data_init(self, ptr, &cg_static_model_type);
@@ -63,7 +63,7 @@ cg_cStaticModel_initialize(mrb_state *mrb, mrb_value self)
 static mrb_value
 cg_cStaticModel_set_orientation(mrb_state *mrb, mrb_value self)
 {
-  auto ptr = (std::shared_ptr<BluCat::StaticModel>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::StaticModel>*)DATA_PTR(self);
   std::shared_ptr<glm::quat> *orientation;
 
   mrb_get_args(mrb, "d", &orientation, &cg_orientation_3d_type);
@@ -75,7 +75,7 @@ cg_cStaticModel_set_orientation(mrb_state *mrb, mrb_value self)
 static mrb_value
 cg_cStaticModel_set_position(mrb_state *mrb, mrb_value self)
 {
-  auto ptr = (std::shared_ptr<BluCat::StaticModel>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::StaticModel>*)DATA_PTR(self);
   std::shared_ptr<glm::vec3> *position;
 
   mrb_get_args(mrb, "d", &position, &cg_vector_3d_type);
@@ -87,8 +87,8 @@ cg_cStaticModel_set_position(mrb_state *mrb, mrb_value self)
 static mrb_value
 cg_cStaticModel_set_texture(mrb_state *mrb, mrb_value self)
 {
-  auto ptr = (std::shared_ptr<BluCat::StaticModel>*)DATA_PTR(self);
-  std::shared_ptr<BluCat::Texture> *texture;
+  auto ptr = (std::shared_ptr<BluCat::GRA::StaticModel>*)DATA_PTR(self);
+  std::shared_ptr<BluCat::GRA::Texture> *texture;
 
   mrb_get_args(mrb, "d", &texture, &cg_texture_type);
   (*ptr)->texture = *texture;
@@ -99,10 +99,10 @@ cg_cStaticModel_set_texture(mrb_state *mrb, mrb_value self)
 static mrb_value
 cg_cStaticModel_draw(mrb_state *mrb, mrb_value self)
 {
-  auto ptr = (std::shared_ptr<BluCat::StaticModel>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::StaticModel>*)DATA_PTR(self);
 
-  auto &instances = cg_core.vk_renderer->static_models_to_draw[
-    cg_core.vk_swapchain->current_frame][(*ptr)->static_mesh];
+  auto &instances = BluCat::INT::core.vk_renderer->static_models_to_draw[
+    BluCat::INT::core.vk_swapchain->current_frame][(*ptr)->static_mesh];
   instances.push_back(*ptr);
 
   return self;
diff --git a/src/static_model.hpp b/src/candy_gear/static_model.hpp
index dfb7054..dfb7054 100644
--- a/src/static_model.hpp
+++ b/src/candy_gear/static_model.hpp
diff --git a/src/texture.cpp b/src/candy_gear/texture.cpp
index 0bfac25..355a622 100644
--- a/src/texture.cpp
+++ b/src/candy_gear/texture.cpp
@@ -18,12 +18,12 @@
 
 #include "core.hpp"
 #include "font.hpp"
-#include "blucat/texture.hpp"
+#include "../blu_cat/gra/texture.hpp"
 
 void
 cg_free_texture(mrb_state *mrb, void* obj)
 {
-  auto *ptr = static_cast<std::shared_ptr<BluCat::Texture>*>(obj);
+  auto *ptr = static_cast<std::shared_ptr<BluCat::GRA::Texture>*>(obj);
 
   ptr->~shared_ptr();
   mrb_free(mrb, ptr);
@@ -48,15 +48,15 @@ cg_cTexture_from_image(mrb_state *mrb, mrb_value self)
 {
   struct mrb_value texture = texture_alloc(mrb, self);
   const char *file_path;
-  std::shared_ptr<BluCat::Texture> *ptr;
+  std::shared_ptr<BluCat::GRA::Texture> *ptr;
 
   mrb_get_args(mrb, "z", &file_path);
-  ptr = (std::shared_ptr<BluCat::Texture>*)DATA_PTR(texture);
+  ptr = (std::shared_ptr<BluCat::GRA::Texture>*)DATA_PTR(texture);
   if(ptr) mrb_free(mrb, ptr);
-  ptr = (std::shared_ptr<BluCat::Texture>*)mrb_malloc(
-    mrb, sizeof(std::shared_ptr<BluCat::Texture>));
-  new(ptr)std::shared_ptr<BluCat::Texture>(
-    std::make_shared<BluCat::Texture>(file_path));
+  ptr = (std::shared_ptr<BluCat::GRA::Texture>*)mrb_malloc(
+    mrb, sizeof(std::shared_ptr<BluCat::GRA::Texture>));
+  new(ptr)std::shared_ptr<BluCat::GRA::Texture>(
+    std::make_shared<BluCat::GRA::Texture>(file_path));
 
   mrb_data_init(texture, ptr, &cg_texture_type);
   return texture;
@@ -68,17 +68,17 @@ cg_cTexture_from_text(mrb_state *mrb, mrb_value self)
   const char *text;
   unsigned int width, height;
   struct mrb_value texture = texture_alloc(mrb, self);
-  BluCat::Font *font_ptr;
-  std::shared_ptr<BluCat::Texture> *ptr;
+  BluCat::GRA::Font *font_ptr;
+  std::shared_ptr<BluCat::GRA::Texture> *ptr;
 
   mrb_get_args(mrb, "dz", &font_ptr, &cg_font_type, &text);
 
-  ptr = (std::shared_ptr<BluCat::Texture>*)DATA_PTR(texture);
+  ptr = (std::shared_ptr<BluCat::GRA::Texture>*)DATA_PTR(texture);
   if(ptr) mrb_free(mrb, ptr);
-  ptr = (std::shared_ptr<BluCat::Texture>*)mrb_malloc(
-    mrb, sizeof(std::shared_ptr<BluCat::Texture>));
-  new(ptr)std::shared_ptr<BluCat::Texture>(
-    std::make_shared<BluCat::Texture>(font_ptr, text));
+  ptr = (std::shared_ptr<BluCat::GRA::Texture>*)mrb_malloc(
+    mrb, sizeof(std::shared_ptr<BluCat::GRA::Texture>));
+  new(ptr)std::shared_ptr<BluCat::GRA::Texture>(
+    std::make_shared<BluCat::GRA::Texture>(font_ptr, text));
 
   mrb_data_init(texture, ptr, &cg_texture_type);
   return texture;
@@ -87,14 +87,14 @@ cg_cTexture_from_text(mrb_state *mrb, mrb_value self)
 static mrb_value
 cg_cTexture_width(mrb_state *mrb, mrb_value self)
 {
-  auto ptr = (std::shared_ptr<BluCat::Texture>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::Texture>*)DATA_PTR(self);
   return mrb_int_value(mrb, (*ptr)->width);
 }
 
 static mrb_value
 cg_cTexture_height(mrb_state *mrb, mrb_value self)
 {
-  auto ptr = (std::shared_ptr<BluCat::Texture>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::Texture>*)DATA_PTR(self);
   return mrb_int_value(mrb, (*ptr)->height);
 }
 
diff --git a/src/texture.hpp b/src/candy_gear/texture.hpp
index b20244d..cd96026 100644
--- a/src/texture.hpp
+++ b/src/candy_gear/texture.hpp
@@ -18,7 +18,7 @@
 #define CANDY_GEAR_TEXTURE_H 1
 
 #include "core.hpp"
-#include "command.hpp"
+#include "../blu_cat/com/command.hpp"
 
 extern const struct mrb_data_type cg_texture_type;
 
diff --git a/src/vector_3d.cpp b/src/candy_gear/vector_3d.cpp
index fc5d186..fc5d186 100644
--- a/src/vector_3d.cpp
+++ b/src/candy_gear/vector_3d.cpp
diff --git a/src/vector_3d.hpp b/src/candy_gear/vector_3d.hpp
index 2827813..2827813 100644
--- a/src/vector_3d.hpp
+++ b/src/candy_gear/vector_3d.hpp
diff --git a/src/vector_4d.cpp b/src/candy_gear/vector_4d.cpp
index ba46bda..5ee674d 100644
--- a/src/vector_4d.cpp
+++ b/src/candy_gear/vector_4d.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,7 +22,7 @@
 #include <mruby/array.h>
 
 #include "vector_3d.hpp"
-#include "view_2d.hpp"
+#include "view.hpp"
 
 namespace
 {
@@ -347,20 +347,16 @@ cg_cVector4D_collide(mrb_state *mrb, mrb_value self)
 static mrb_value
 cg_cVector4D_draw_rectangle(mrb_state *mrb, mrb_value self)
 {
-  mrb_value view_value;
-  BluCat::View2D *view_2d;
   std::shared_ptr<glm::vec3> *color;
   auto ptr = (std::shared_ptr<glm::vec4>*)DATA_PTR(self);
 
-  mrb_get_args(mrb, "od", &view_value, &color, &cg_vector_3d_type);
-
-  view_2d = cg_cView_to_view_2d(mrb, view_value);
+  mrb_get_args(mrb, "d", &color, &cg_vector_3d_type);
 
   glm::vec4 position(
     (*ptr)->x, (*ptr)->y, (*ptr)->x + (*ptr)->z, (*ptr)->y + (*ptr)->w);
-  BluCat::Rectangle rect{position, (**color)};
-  auto &rectangles = view_2d->rectangles_to_draw[
-    cg_core.vk_swapchain->current_frame];
+  BluCat::GRA::Rectangle rect{position, (**color)};
+  auto &rectangles = BluCat::INT::core.vk_renderer->rectangles_to_draw[
+    BluCat::INT::core.vk_swapchain->current_frame];
   rectangles.push_back(rect);
 
   return self;
diff --git a/src/vector_4d.hpp b/src/candy_gear/vector_4d.hpp
index 2797d53..2797d53 100644
--- a/src/vector_4d.hpp
+++ b/src/candy_gear/vector_4d.hpp
diff --git a/src/view_3d.cpp b/src/candy_gear/view.cpp
index ddaa3eb..40a03a8 100644
--- a/src/view_3d.cpp
+++ b/src/candy_gear/view.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,53 +14,53 @@
  * limitations under the License.
  */
 
-#include "view_3d.hpp"
+#include "view.hpp"
 
 #include "sprite.hpp"
 #include "orientation_3d.hpp"
 #include "vector_3d.hpp"
 #include "vector_4d.hpp"
-#include "blucat/sprite.hpp"
-#include "blucat/view_3d.hpp"
+#include "../blu_cat/gra/sprite.hpp"
+#include "../blu_cat/gra/view.hpp"
 
 void
-cg_free_view_3d(mrb_state *mrb, void* obj)
+cg_free_view(mrb_state *mrb, void* obj)
 {
-  auto ptr = static_cast<std::shared_ptr<BluCat::View3D>*>(obj);
+  auto ptr = static_cast<std::shared_ptr<BluCat::GRA::View>*>(obj);
 
   ptr->~shared_ptr();
   mrb_free(mrb, ptr);
 }
 
-const struct mrb_data_type cg_view_3d_type = { "CG_View3D", cg_free_view_3d };
+const struct mrb_data_type cg_view_type = { "CG_View", cg_free_view };
 
 static mrb_value
-cg_cView3D_initialize(mrb_state *mrb, mrb_value self)
+cg_cView_initialize(mrb_state *mrb, mrb_value self)
 {
   std::shared_ptr<glm::vec4> *region;
   mrb_float projection_width, projection_height;
-  std::shared_ptr<BluCat::View3D> *ptr;
+  std::shared_ptr<BluCat::GRA::View> *ptr;
 
   mrb_get_args(mrb, "dff", &region, &cg_vector_4d_type,
                &projection_width, &projection_height);
-  ptr = (std::shared_ptr<BluCat::View3D>*)DATA_PTR(self);
+  ptr = (std::shared_ptr<BluCat::GRA::View>*)DATA_PTR(self);
   if(ptr) mrb_free(mrb, ptr);
-  ptr = (std::shared_ptr<BluCat::View3D>*)mrb_malloc(
-    mrb, sizeof(std::shared_ptr<BluCat::View3D>));
+  ptr = (std::shared_ptr<BluCat::GRA::View>*)mrb_malloc(
+    mrb, sizeof(std::shared_ptr<BluCat::GRA::View>));
 
-  new(ptr)std::shared_ptr<BluCat::View3D>(
-    std::make_shared<BluCat::View3D>(
+  new(ptr)std::shared_ptr<BluCat::GRA::View>(
+    std::make_shared<BluCat::GRA::View>(
       *region->get(), projection_width, projection_height));
 
-  mrb_data_init(self, ptr, &cg_view_3d_type);
+  mrb_data_init(self, ptr, &cg_view_type);
   return self;
 }
 
 static mrb_value
-cg_cView3D_set_camera_position(mrb_state *mrb, mrb_value self)
+cg_cView_set_camera_position(mrb_state *mrb, mrb_value self)
 {
   std::shared_ptr<glm::vec3> *camera_position;
-  auto ptr = (std::shared_ptr<BluCat::View3D>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::View>*)DATA_PTR(self);
 
   mrb_get_args(mrb, "d", &camera_position, &cg_vector_3d_type);
   (*ptr)->camera_position = (*camera_position);
@@ -69,10 +69,10 @@ cg_cView3D_set_camera_position(mrb_state *mrb, mrb_value self)
 }
 
 static mrb_value
-cg_cView3D_set_camera_orientation(mrb_state *mrb, mrb_value self)
+cg_cView_set_camera_orientation(mrb_state *mrb, mrb_value self)
 {
   std::shared_ptr<glm::quat> *camera_orientation;
-  auto ptr = (std::shared_ptr<BluCat::View3D>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::View>*)DATA_PTR(self);
 
   mrb_get_args(mrb, "d", &camera_orientation, &cg_orientation_3d_type);
   (*ptr)->camera_orientation = (*camera_orientation);
@@ -81,9 +81,9 @@ cg_cView3D_set_camera_orientation(mrb_state *mrb, mrb_value self)
 }
 
 static mrb_value
-cg_cView3D_get_field_of_view(mrb_state *mrb, mrb_value self)
+cg_cView_get_field_of_view(mrb_state *mrb, mrb_value self)
 {
-  auto ptr = (std::shared_ptr<BluCat::View3D>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::View>*)DATA_PTR(self);
 
   return mrb_float_value(mrb, (*ptr)->field_of_view);
 
@@ -91,10 +91,10 @@ cg_cView3D_get_field_of_view(mrb_state *mrb, mrb_value self)
 }
 
 static mrb_value
-cg_cView3D_set_field_of_view(mrb_state *mrb, mrb_value self)
+cg_cView_set_field_of_view(mrb_state *mrb, mrb_value self)
 {
   mrb_float fov;
-  auto ptr = (std::shared_ptr<BluCat::View3D>*)DATA_PTR(self);
+  auto ptr = (std::shared_ptr<BluCat::GRA::View>*)DATA_PTR(self);
 
   mrb_get_args(mrb, "f", &fov);
   (*ptr)->field_of_view = fov;
@@ -103,25 +103,25 @@ cg_cView3D_set_field_of_view(mrb_state *mrb, mrb_value self)
 }
 
 void
-cg_view_3d_init(mrb_state *mrb)
+cg_view_init(mrb_state *mrb)
 {
-  struct RClass *cg_m, *cg_cView3D;
+  struct RClass *cg_m, *cg_cView;
 
   cg_m = mrb_module_get(mrb, "CandyGear");
-  cg_cView3D = mrb_define_class_under(mrb, cg_m, "View3D", mrb->object_class);
-  MRB_SET_INSTANCE_TT(cg_cView3D, MRB_TT_DATA);
+  cg_cView = mrb_define_class_under(mrb, cg_m, "View", mrb->object_class);
+  MRB_SET_INSTANCE_TT(cg_cView, MRB_TT_DATA);
   mrb_define_method(
-    mrb, cg_cView3D, "initialize", cg_cView3D_initialize, MRB_ARGS_REQ(3));
+    mrb, cg_cView, "initialize", cg_cView_initialize, MRB_ARGS_REQ(3));
   mrb_define_method(
-    mrb, cg_cView3D, "camera_position=", cg_cView3D_set_camera_position,
+    mrb, cg_cView, "camera_position=", cg_cView_set_camera_position,
     MRB_ARGS_REQ(1));
   mrb_define_method(
-    mrb, cg_cView3D, "camera_orientation=", cg_cView3D_set_camera_orientation,
+    mrb, cg_cView, "camera_orientation=", cg_cView_set_camera_orientation,
     MRB_ARGS_REQ(1));
   mrb_define_method(
-    mrb, cg_cView3D, "field_of_view", cg_cView3D_get_field_of_view,
+    mrb, cg_cView, "field_of_view", cg_cView_get_field_of_view,
     MRB_ARGS_NONE());
   mrb_define_method(
-    mrb, cg_cView3D, "field_of_view=", cg_cView3D_set_field_of_view,
+    mrb, cg_cView, "field_of_view=", cg_cView_set_field_of_view,
     MRB_ARGS_REQ(1));
 }
diff --git a/src/view_3d.hpp b/src/candy_gear/view.hpp
index 22aa084..ce1b556 100644
--- a/src/view_3d.hpp
+++ b/src/candy_gear/view.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,14 +14,14 @@
  * limitations under the License.
  */
 
-#ifndef CANDY_GEAR_VIEW_3D_H
-#define CANDY_GEAR_VIEW_3D_H 1
+#ifndef CANDY_GEAR_VIEW_H
+#define CANDY_GEAR_VIEW_H 1
 
 #include "core.hpp"
 
-extern const struct mrb_data_type cg_view_3d_type;
+extern const struct mrb_data_type cg_view_type;
 
 void
-cg_view_3d_init(mrb_state *mrb);
+cg_view_init(mrb_state *mrb);
 
-#endif /* CANDY_GEAR_VIEW_3D_H */
+#endif /* CANDY_GEAR_VIEW_H */
diff --git a/src/core.cpp b/src/core.cpp
deleted file mode 100644
index f524e36..0000000
--- a/src/core.cpp
+++ /dev/null
@@ -1,850 +0,0 @@
-/*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "core.hpp"
-
-#include "candy_gear.hpp"
-#include "font.hpp"
-#include "graphic.hpp"
-#include "key.hpp"
-#include "orientation_3d.hpp"
-#include "skeletal_model.hpp"
-#include "skeletal_mesh.hpp"
-#include "static_model.hpp"
-#include "static_mesh.hpp"
-#include "sound.hpp"
-#include "sprite.hpp"
-#include "sprite_3d.hpp"
-#include "texture.hpp"
-#include "vector_3d.hpp"
-#include "vector_4d.hpp"
-#include "view_2d.hpp"
-#include "view_3d.hpp"
-
-#ifdef DEBUG
-#include <sstream>
-#endif
-
-std::random_device random_seed;
-std::mt19937 random_number_generator;
-
-namespace
-{
-
-#ifdef DEBUG
-VKAPI_ATTR VkBool32 VKAPI_CALL
-vk_debug_callback(
-  VkDebugUtilsMessageSeverityFlagBitsEXT message_severity,
-  VkDebugUtilsMessageTypeFlagsEXT message_type,
-  const VkDebugUtilsMessengerCallbackDataEXT* callback_data,
-  void* _obj)
-{
-  // Set level.
-  Log::Level log_level;
-  switch(message_severity)
-  {
-  case VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT:
-    log_level = Log::Level::Trace;
-    break;
-  case VK_DEBUG_UTILS_MESSAGE_SEVERITY_INFO_BIT_EXT:
-    log_level = Log::Level::Information;
-    break;
-  case VK_DEBUG_UTILS_MESSAGE_SEVERITY_WARNING_BIT_EXT:
-    log_level = Log::Level::Warning;
-    break;
-  case VK_DEBUG_UTILS_MESSAGE_SEVERITY_ERROR_BIT_EXT:
-  default:
-    log_level = Log::Level::Error;
-    break;
-  }
-
-  // Log message.
-  cg_core.log.message(log_level, callback_data->pMessage);
-
-  return VK_FALSE;
-}
-#endif
-
-void
-load_threads(void *obj)
-{
-  auto num_threads{std::thread::hardware_concurrency() - 1};
-  for(auto i{0}; i < num_threads; i++)
-    cg_core.threads.emplace_back(
-      cg_core.workers.emplace_back(&cg_core.job_queue));
-}
-
-void
-unload_threads(void *obj)
-{
-  cg_core.job_queue.stop();
-  for(auto &t: cg_core.threads) t.join();
-}
-
-void
-load_mruby_symbols(void *obj)
-{
-  cg_core.sym_config = mrb_intern_cstr(cg_core.mrb, "config");
-  cg_core.sym_debug = mrb_intern_cstr(cg_core.mrb, "debug");
-  cg_core.sym_error = mrb_intern_cstr(cg_core.mrb, "error");
-  cg_core.sym_fatal = mrb_intern_cstr(cg_core.mrb, "fatal");
-  cg_core.sym_information = mrb_intern_cstr(cg_core.mrb, "information");
-  cg_core.sym_init = mrb_intern_cstr(cg_core.mrb, "init");
-  cg_core.sym_key_down = mrb_intern_cstr(cg_core.mrb, "key_down");
-  cg_core.sym_key_up = mrb_intern_cstr(cg_core.mrb, "key_up");
-  cg_core.sym_quit = mrb_intern_cstr(cg_core.mrb, "quit");
-  cg_core.sym_tick = mrb_intern_cstr(cg_core.mrb, "tick");
-  cg_core.sym_trace = mrb_intern_cstr(cg_core.mrb, "trace");
-  cg_core.sym_warning = mrb_intern_cstr(cg_core.mrb, "warning");
-}
-
-void
-load_game(void *obj)
-{
-  using namespace std::chrono;
-
-  FILE *fp;
-  mrb_value main_obj{mrb_top_self(cg_core.mrb)};
-
-  cg_core.game_name = "CandyGear Game";
-
-  cg_core.display_width = 800;
-  cg_core.display_height = 600;
-
-  cg_core.game_version_major = 0;
-  cg_core.game_version_minor = 1;
-  cg_core.game_version_patch = 0;
-
-  cg_core.fps = 30;
-
-  mrb_define_module(cg_core.mrb, "CandyGear");
-  cg_candy_gear_init_config(cg_core.mrb);
-  cg_graphic_init_config(cg_core.mrb);
-
-
-  fp = fopen(cg_core.game_file.c_str(), "rb");
-  mrb_load_irep_file(cg_core.mrb, fp);
-  fclose(fp);
-  if (cg_core.mrb->exc)
-  {
-    mrb_print_error(cg_core.mrb);
-    throw CommandError{"Error loading game."};
-  }
-
-  mrb_funcall_id(cg_core.mrb, main_obj, cg_core.sym_config, 0);
-  if (cg_core.mrb->exc)
-  {
-    mrb_print_error(cg_core.mrb);
-    throw CommandError{"Error configuring game."};
-  }
-
-  cg_candy_gear_finish_config(cg_core.mrb);
-  cg_graphic_finish_config(cg_core.mrb);
-
-  cg_core.max_frame_duration =
-  duration<long long, std::milli>(1000 / cg_core.fps);
-  // FIXME: actually calculates the real delta time.
-  cg_core.delta_time = 1.0f / cg_core.fps;
-}
-
-void
-load_sdl(void *obj)
-{
-  if(SDL_Init(SDL_INIT_EVERYTHING) < 0)
-  {
-    std::string error{"SDL could not initialize! SDL Error → "};
-    error += SDL_GetError();
-    throw error;
-  }
-
-  if(SDL_Vulkan_LoadLibrary(nullptr) != 0)
-  {
-    SDL_Quit();
-    std::string error{"SDL could not initialize Vulkan! SDL_Error → "};
-    error += SDL_GetError();
-    throw CommandError{error};
-  }
-}
-
-void
-unload_sdl(void *obj)
-{
-  SDL_Vulkan_UnloadLibrary();
-  SDL_Quit();
-}
-
-void
-load_sdl_mixer(void *obj)
-{
-  int flags = MIX_INIT_OGG|MIX_INIT_MOD;
-  int initted = Mix_Init(flags);
-  if(initted&flags != flags)
-  {
-    std::string error{"Could not initialize SDL mixer → "};
-    error += Mix_GetError();
-    throw CommandError{error};
-  }
-}
-
-void
-unload_sdl_mixer(void *obj)
-{
-  while(Mix_Init(0)) Mix_Quit();
-}
-
-void
-load_sdl_open_audio(void *obj)
-{
-  if(Mix_OpenAudio(22050, MIX_DEFAULT_FORMAT, 2, 1024) == -1)
-  {
-    std::string error{"Could not open SDL mixer audio → "};
-    error += Mix_GetError();
-    throw CommandError{error};
-  }
-}
-
-void
-unload_sdl_open_audio(void *obj)
-{
-  Mix_CloseAudio();
-}
-
-void
-load_window(void *obj)
-{
-  cg_core.window = NULL;
-  cg_core.window = SDL_CreateWindow(
-    cg_core.game_name.c_str(), SDL_WINDOWPOS_UNDEFINED,
-    SDL_WINDOWPOS_UNDEFINED, cg_core.display_width, cg_core.display_height,
-    SDL_WINDOW_VULKAN);
-  if(cg_core.window == NULL)
-  {
-    std::string error{"Window could not be created! SDL_Error → "};
-    error += SDL_GetError();
-    throw CommandError{error};
-  }
-}
-
-void
-unload_window(void *obj)
-{
-  SDL_DestroyWindow(cg_core.window);
-}
-
-void
-load_font_library(void *obj)
-{
-  FT_Error error{FT_Init_FreeType(&cg_core.font_library)};
-  if(error) throw CommandError{"Failed to open the FreeType library."};
-}
-
-void
-unload_font_library(void *obj)
-{
-  FT_Done_FreeType(cg_core.font_library);
-}
-
-void
-load_blucat_instance(void *obj)
-{
-  std::vector<const char*> vk_extensions;
-  std::vector<const char*> vk_required_layers_names;
-
-  // Get extensions.
-  {
-    uint32_t vk_extensions_count;
-    std::vector<const char*> vk_required_extensions;
-
-    // Load debuging layers.
-#ifdef DEBUG
-    vk_required_extensions.push_back(VK_EXT_DEBUG_UTILS_EXTENSION_NAME);
-    vk_required_layers_names.push_back("VK_LAYER_KHRONOS_validation");
-#endif
-
-    // Get extensions for SDL.
-    {
-      uint32_t vk_sdl_extension_count;
-      std::vector<const char*> vk_sdl_extensions;
-
-      if(!SDL_Vulkan_GetInstanceExtensions(
-	   cg_core.window, &vk_sdl_extension_count, nullptr))
-      {
-	std::string error{
-	  "Vulkan extensions could not be loaded by SDL! SDL_Error: "};
-	error += SDL_GetError();
-	throw CommandError{error};
-      }
-
-      vk_sdl_extensions.resize(vk_sdl_extension_count);
-      SDL_Vulkan_GetInstanceExtensions(
-	cg_core.window, &vk_sdl_extension_count, vk_sdl_extensions.data());
-
-      // Combine all extensions.
-      vk_extensions_count = vk_sdl_extension_count +
-	vk_required_extensions.size();
-      vk_extensions.resize(vk_extensions_count);
-      for(auto i{0}; i < vk_sdl_extension_count; i++)
-	vk_extensions[i] = vk_sdl_extensions[i];
-      for(auto i{0}; i < vk_required_extensions.size(); i++)
-	vk_extensions[i + vk_sdl_extension_count] = vk_required_extensions[i];
-    }
-
-#ifdef DEBUG
-    cg_core.log.message(Log::Level::Trace, "Enabled VK extensions.");
-    for(auto vk_extension: vk_extensions)
-    {
-      std::string message{"Extension name: "};
-      message += vk_extension;
-      cg_core.log.message(Log::Level::Trace, message);
-    }
-#endif
-  }
-
-  // Get available instance layers.
-  {
-    uint32_t vk_available_layers_count;
-    std::vector<VkLayerProperties> vk_available_layers;
-    std::vector<const char*> vk_available_layers_names;
-
-    vkEnumerateInstanceLayerProperties(&vk_available_layers_count, nullptr);
-    vk_available_layers.resize(vk_available_layers_count);
-    vkEnumerateInstanceLayerProperties(&vk_available_layers_count,
-				       vk_available_layers.data());
-    vk_available_layers_names.resize(vk_available_layers_count);
-#ifdef DEBUG
-    cg_core.log.message(Log::Level::Trace, "Available VK instance layers.");
-#endif
-    for(uint32_t i = 0; i < vk_available_layers_count; i++)
-    {
-#ifdef DEBUG
-      std::stringstream message{};
-      message << "\nname: " << vk_available_layers[i].layerName << std::endl;
-      message << "Description: " << vk_available_layers[i].description <<
-	std::endl;
-      message << "Spec version: " << vk_available_layers[i].specVersion <<
-	std::endl;
-      message << "Implementation version: " <<
-	vk_available_layers[i].implementationVersion << std::endl;
-      cg_core.log.message(Log::Level::Trace, message.str());
-#endif
-
-      vk_available_layers_names[i] = vk_available_layers[i].layerName;
-    }
-
-    // If required layers are not all available.
-    if(!std::includes(
-	 vk_available_layers_names.begin(), vk_available_layers_names.end(),
-	 vk_required_layers_names.begin(), vk_required_layers_names.begin()))
-      throw CommandError{"Some required Vulkan layers are not available."};
-  }
-
-  {
-    VkApplicationInfo app_info;
-    app_info.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
-    app_info.pNext = nullptr;
-    app_info.pApplicationName = cg_core.game_name.c_str();
-    app_info.applicationVersion = VK_MAKE_VERSION(
-      cg_core.game_version_major,
-      cg_core.game_version_minor,
-      cg_core.game_version_patch);
-    app_info.pEngineName = "CandyGear";
-    app_info.engineVersion = VK_MAKE_VERSION(
-      CANDY_GEAR_VERSION_MAJOR,
-      CANDY_GEAR_VERSION_MINOR,
-      CANDY_GEAR_VERSION_PATCH);
-    app_info.apiVersion = VK_API_VERSION_1_0;
-
-    VkInstanceCreateInfo create_info;
-    create_info.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
-    create_info.pNext = nullptr;
-    create_info.flags = 0;
-    create_info.pApplicationInfo = &app_info;
-    create_info.enabledExtensionCount = vk_extensions.size();
-    create_info.ppEnabledExtensionNames = vk_extensions.data();
-    create_info.enabledLayerCount = vk_required_layers_names.size();
-    create_info.ppEnabledLayerNames = vk_required_layers_names.data();
-
-    VkResult result =
-      vkCreateInstance(&create_info, nullptr, &cg_core.vk_instance);
-    if(result != VK_SUCCESS)
-    {
-      std::string error{""};
-      switch(result)
-      {
-      case VK_ERROR_LAYER_NOT_PRESENT:
-	error = " Layer not present.";
-	break;
-      case VK_ERROR_EXTENSION_NOT_PRESENT:
-	error = " Extension not present.";
-      }
-      error = "Failed to create Vulkan instance." + error;
-      throw CommandError{error};
-    }
-  }
-}
-
-void
-unload_blucat_instance(void *obj)
-{
-  vkDestroyInstance(cg_core.vk_instance, nullptr);
-}
-
-void
-load_window_surface(void *obj)
-{
-  if(!SDL_Vulkan_CreateSurface(
-       cg_core.window, cg_core.vk_instance, &cg_core.window_surface))
-  {
-    std::string error{"Failed to create a window surface → "};
-    error += SDL_GetError();
-    throw CommandError{error};
-  }
-}
-
-void
-unload_window_surface(void *obj)
-{
-  vkDestroySurfaceKHR(cg_core.vk_instance, cg_core.window_surface, nullptr);
-}
-
-#ifdef DEBUG
-void
-load_blucat_debug_callback(void *obj)
-{
-  PFN_vkCreateDebugUtilsMessengerEXT debug_messenger;
-
-  // A Vulkan instance extension named VK_EXT_debug_utils and a Vulkan instance
-  // layer named VK_LAYER_LUNARG_standard_validation are required to enable
-  // this callback. These instance extension and instance layer are loaded at
-  // Instance::load_blucat_instance.
-  VkDebugUtilsMessengerCreateInfoEXT create_info;
-  create_info.sType = VK_STRUCTURE_TYPE_DEBUG_UTILS_MESSENGER_CREATE_INFO_EXT;
-  create_info.pNext = nullptr;
-  create_info.messageSeverity =
-      VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT |
-      VK_DEBUG_UTILS_MESSAGE_SEVERITY_INFO_BIT_EXT |
-      VK_DEBUG_UTILS_MESSAGE_SEVERITY_WARNING_BIT_EXT |
-      VK_DEBUG_UTILS_MESSAGE_SEVERITY_ERROR_BIT_EXT;
-  create_info.messageType = VK_DEBUG_UTILS_MESSAGE_TYPE_GENERAL_BIT_EXT |
-			    VK_DEBUG_UTILS_MESSAGE_TYPE_VALIDATION_BIT_EXT |
-			    VK_DEBUG_UTILS_MESSAGE_TYPE_PERFORMANCE_BIT_EXT;
-  create_info.pfnUserCallback = vk_debug_callback;
-  create_info.pUserData = nullptr;
-  create_info.flags = 0;
-
-  debug_messenger = (PFN_vkCreateDebugUtilsMessengerEXT)
-    vkGetInstanceProcAddr(cg_core.vk_instance,
-			  "vkCreateDebugUtilsMessengerEXT");
-
-  if(debug_messenger(cg_core.vk_instance, &create_info, nullptr,
-		     &cg_core.vk_callback) != VK_SUCCESS)
-    CommandError{"Failed to setup debug callback for Vulkan."};
-}
-
-void
-unload_blucat_debug_callback(void *obj)
-{
-  PFN_vkDestroyDebugUtilsMessengerEXT debug_messenger;
-
-  debug_messenger = (PFN_vkDestroyDebugUtilsMessengerEXT)
-    vkGetInstanceProcAddr(cg_core.vk_instance,
-			  "vkDestroyDebugUtilsMessengerEXT");
-
-  debug_messenger(cg_core.vk_instance, cg_core.vk_callback, nullptr);
-}
-#endif
-
-void
-load_blucat_devices(void *obj)
-{
-  uint32_t devices_count;
-  std::vector<VkPhysicalDevice> vk_physical_devices;
-
-  // Enumerate physical devices
-  {
-    vkEnumeratePhysicalDevices(cg_core.vk_instance, &devices_count, nullptr);
-    if(devices_count < 1)
-      CommandError{"Failed to find GPUs with Vulkan support."};
-    vk_physical_devices.resize(devices_count);
-    vkEnumeratePhysicalDevices(
-      cg_core.vk_instance, &devices_count, vk_physical_devices.data());
-  }
-
-#ifdef DEBUG
-  cg_core.log.message(Log::Level::Trace, "Physical devices properties");
-#endif
-
-  cg_core.vk_devices.reserve(devices_count);
-  for(auto i = 0; i < devices_count; i++)
-  {
-    // Use swapchain on first device.
-    if(i == 0)
-    {
-      cg_core.vk_devices.emplace_back(vk_physical_devices[i], true);
-      cg_core.vk_device_with_swapchain = &cg_core.vk_devices[i];
-    }
-    else
-      cg_core.vk_devices.emplace_back(vk_physical_devices[i], false);
-  }
-}
-
-void
-unload_blucat_devices(void *obj)
-{
-  cg_core.vk_devices.clear();
-}
-
-static void
-load_blucat_swapchain(void *obj)
-{
-  try { cg_core.vk_swapchain = new BluCat::Swapchain(); }
-  catch(const CommandError &error)
-  {
-    std::string error_message{"Failed to create swapchain → "};
-    error_message += error.what();
-    throw CommandError{error_message};
-  }
-}
-
-void
-unload_blucat_swapchain(void *obj)
-{
-  delete cg_core.vk_swapchain;
-}
-
-void
-load_blucat_framebuffer(void *obj)
-{
-  try
-  {
-    cg_core.vk_framebuffer = new BluCat::Framebuffer();
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to create framebuffer."};
-  }
-}
-
-void
-unload_blucat_framebuffer(void *obj)
-{
-  delete cg_core.vk_framebuffer;
-}
-
-void
-load_blucat_render_pass(void *obj)
-{
-  try
-  {
-    cg_core.vk_render_pass = new BluCat::RenderPass();
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to create render pass."};
-  }
-}
-
-void
-unload_blucat_render_pass(void *obj)
-{
-  delete cg_core.vk_render_pass;
-}
-
-void
-load_blucat_descriptor_set_layout(void *obj)
-{
-  try
-  {
-    cg_core.vk_descriptor_set_layout = new BluCat::DescriptorSetLayout();
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to create descriptor set layouts."};
-  }
-}
-
-void
-unload_blucat_descriptor_set_layout(void *obj)
-{
-  delete cg_core.vk_descriptor_set_layout;
-}
-
-void
-load_blucat_graphics_pipeline_3d_layout(void *obj)
-{
-  try
-  {
-    cg_core.vk_graphics_pipeline_3d_layout =
-      new BluCat::GraphicsPipeline3DLayout();
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to create 3d graphics pipeline."};
-  }
-}
-
-void
-unload_blucat_graphics_pipeline_3d_layout(void *obj)
-{
-  delete cg_core.vk_graphics_pipeline_3d_layout;
-}
-
-void
-load_blucat_graphics_pipeline_2d_solid_layout(void *obj)
-{
-  try
-  {
-    cg_core.vk_graphics_pipeline_2d_solid_layout =
-      new BluCat::GraphicsPipeline2DSolidLayout();
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to create 2d graphics pipeline."};
-  }
-}
-
-void
-unload_blucat_graphics_pipeline_2d_solid_layout(void *obj)
-{
-  delete cg_core.vk_graphics_pipeline_2d_solid_layout;
-}
-
-void
-load_blucat_graphics_pipeline_2d_wired_layout(void *obj)
-{
-  try
-  {
-    cg_core.vk_graphics_pipeline_2d_wired_layout =
-      new BluCat::GraphicsPipeline2DWiredLayout();
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to create 2d graphics pipeline."};
-  }
-}
-
-void
-unload_blucat_graphics_pipeline_2d_wired_layout(void *obj)
-{
-  delete cg_core.vk_graphics_pipeline_2d_wired_layout;
-}
-
-void
-load_blucat_light(void *obj)
-{
-  try
-  {
-    cg_core.vk_light = new BluCat::Light();
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to descriptor sets for light."};
-  }
-}
-
-void
-unload_blucat_light(void *obj)
-{
-  delete cg_core.vk_light;
-}
-
-void
-load_blucat_graphics_pipeline_3d(void *obj)
-{
-  try
-  {
-    cg_core.vk_graphics_pipeline_3d =
-      std::make_unique<BluCat::GraphicsPipeline3D>();
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to create 3d graphics pipeline."};
-  }
-}
-
-void
-unload_blucat_graphics_pipeline_3d(void *obj)
-{
-  cg_core.vk_graphics_pipeline_3d = nullptr;
-}
-
-void
-load_blucat_graphics_pipeline_3d_skeletal(void *obj)
-{
-  try
-  {
-    cg_core.vk_graphics_pipeline_3d_skeletal =
-      std::make_unique<BluCat::GraphicsPipeline3DSkeletal>();
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to create 3d skeletal graphics pipeline."};
-  }
-}
-
-void
-unload_blucat_graphics_pipeline_3d_skeletal(void *obj)
-{
-  cg_core.vk_graphics_pipeline_3d_skeletal = nullptr;
-}
-
-void
-load_blucat_graphics_pipeline_sprite_3d(void *obj)
-{
-  try
-  {
-    cg_core.vk_graphics_pipeline_sprite_3d =
-      std::make_unique<BluCat::GraphicsPipelineSprite3D>();
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to create sprite 3d graphics pipeline."};
-  }
-}
-
-void
-unload_blucat_graphics_pipeline_sprite_3d(void *obj)
-{
-  cg_core.vk_graphics_pipeline_sprite_3d = nullptr;
-}
-
-void
-load_blucat_graphics_pipeline_2d_solid(void *obj)
-{
-  try
-  {
-    cg_core.vk_graphics_pipeline_2d_solid =
-      std::make_unique<BluCat::GraphicsPipeline2DSolid>();
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to create 2d graphics pipeline."};
-  }
-}
-
-void
-unload_blucat_graphics_pipeline_2d_solid(void *obj)
-{
-  cg_core.vk_graphics_pipeline_2d_solid = nullptr;
-}
-
-void
-load_blucat_graphics_pipeline_2d_wired(void *obj)
-{
-  try
-  {
-    cg_core.vk_graphics_pipeline_2d_wired =
-      std::make_unique<BluCat::GraphicsPipeline2DWired>();
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to create 2d graphics pipeline."};
-  }
-}
-
-void
-unload_blucat_graphics_pipeline_2d_wired(void *obj)
-{
-  cg_core.vk_graphics_pipeline_2d_wired = nullptr;
-}
-
-void
-load_blucat_renderer(void *obj)
-{
-  try
-  {
-    glm::vec4 region(
-      0.f, 0.f,
-      static_cast<float>(cg_core.display_width),
-      static_cast<float>(cg_core.display_height));
-    cg_core.vk_renderer = new BluCat::Renderer(
-      {},
-      {std::make_shared<BluCat::View3D>(region, region.z, region.w)});
-  }
-  catch(const CommandError &e)
-  {
-    throw CommandError{"Failed to create renderer."};
-  }
-}
-
-void
-unload_blucat_renderer(void *obj)
-{
-  delete cg_core.vk_renderer;
-}
-
-void
-load_mruby_interface(void *obj)
-{
-  cg_candy_gear_init(cg_core.mrb);
-  cg_font_init(cg_core.mrb);
-  cg_key_init(cg_core.mrb);
-  cg_orientation_3d_init(cg_core.mrb);
-  cg_skeletal_model_init(cg_core.mrb);
-  cg_skeletal_mesh_init(cg_core.mrb);
-  cg_static_model_init(cg_core.mrb);
-  cg_static_mesh_init(cg_core.mrb);
-  cg_sound_init(cg_core.mrb);
-  cg_sprite_init(cg_core.mrb);
-  cg_sprite_3d_init(cg_core.mrb);
-  cg_texture_init(cg_core.mrb);
-  cg_vector_3d_init(cg_core.mrb);
-  cg_vector_4d_init(cg_core.mrb);
-  cg_view_2d_init(cg_core.mrb);
-  cg_view_3d_init(cg_core.mrb);
-}
-
-}
-
-const CommandChain cg_sCore::loader{
-  {&load_threads, &unload_threads},
-  {&load_mruby_symbols, nullptr},
-  {&load_game, nullptr},
-  {&load_sdl, &unload_sdl},
-  {&load_sdl_mixer, &unload_sdl_mixer},
-  {&load_sdl_open_audio, &unload_sdl_open_audio},
-  {&load_window, &unload_window},
-  {&load_font_library, &unload_font_library},
-  {&load_blucat_instance, &unload_blucat_instance},
-  {&load_window_surface, &unload_window_surface},
-#ifdef DEBUG
-  {&load_blucat_debug_callback, &unload_blucat_debug_callback},
-#endif
-  {&load_blucat_devices, &unload_blucat_devices},
-  {&load_blucat_swapchain, &unload_blucat_swapchain},
-
-  {&load_blucat_render_pass, &unload_blucat_render_pass},
-  {&load_blucat_framebuffer, &unload_blucat_framebuffer},
-  {&load_blucat_descriptor_set_layout, &unload_blucat_descriptor_set_layout},
-  {&load_blucat_graphics_pipeline_3d_layout,
-   &unload_blucat_graphics_pipeline_3d_layout},
-  {&load_blucat_graphics_pipeline_2d_solid_layout,
-   &unload_blucat_graphics_pipeline_2d_solid_layout},
-  {&load_blucat_graphics_pipeline_2d_wired_layout,
-   &unload_blucat_graphics_pipeline_2d_wired_layout},
-  {&load_blucat_light, &unload_blucat_light},
-  // TODO: finish skeletal mesh animation
-	{&load_blucat_graphics_pipeline_3d_skeletal,
-	 &unload_blucat_graphics_pipeline_3d_skeletal},
-  {&load_blucat_graphics_pipeline_3d, &unload_blucat_graphics_pipeline_3d},
-  {&load_blucat_graphics_pipeline_sprite_3d,
-   &unload_blucat_graphics_pipeline_sprite_3d},
-  {&load_blucat_graphics_pipeline_2d_solid, &unload_blucat_graphics_pipeline_2d_solid},
-  {&load_blucat_graphics_pipeline_2d_wired, &unload_blucat_graphics_pipeline_2d_wired},
-
-  {&load_blucat_renderer, &unload_blucat_renderer},
-  {&load_mruby_interface, nullptr}
-};
diff --git a/src/core.hpp b/src/core.hpp
deleted file mode 100644
index c351917..0000000
--- a/src/core.hpp
+++ /dev/null
@@ -1,148 +0,0 @@
-/*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef CANDY_GEAR_CORE_H
-#define CANDY_GEAR_CORE_H 1
-
-#define CANDY_GEAR_VERSION_MAJOR 0
-#define CANDY_GEAR_VERSION_MINOR 1
-#define CANDY_GEAR_VERSION_PATCH 0
-
-#include <chrono>
-#include <random>
-
-#include <mruby.h>
-#include <mruby/class.h>
-#include <mruby/compile.h>
-#include <mruby/data.h>
-#include <mruby/dump.h>
-#include <mruby/variable.h>
-
-#define SDL_MAIN_HANDLED
-
-#ifdef _WIN64
-#include <Windows.h>
-#endif
-
-#include <SDL2/SDL.h>
-#include <SDL2/SDL_vulkan.h>
-#include <SDL2/SDL_mixer.h>
-
-#include <ft2build.h>
-#include FT_FREETYPE_H
-
-#include "command.hpp"
-#include "job_queue.hpp"
-#include "log.hpp"
-#include "worker.hpp"
-
-#include "blucat/device.hpp"
-#include "blucat/descriptor_set_layout.hpp"
-#include "blucat/render_pass.hpp"
-#include "blucat/framebuffer.hpp"
-#include "blucat/graphics_pipeline_2d_solid_layout.hpp"
-#include "blucat/graphics_pipeline_2d_wired_layout.hpp"
-#include "blucat/light.hpp"
-#include "blucat/graphics_pipeline_2d_solid.hpp"
-#include "blucat/graphics_pipeline_2d_wired.hpp"
-#include "blucat/graphics_pipeline_3d_layout.hpp"
-#include "blucat/graphics_pipeline_3d.hpp"
-#include "blucat/graphics_pipeline_3d_skeletal.hpp"
-#include "blucat/graphics_pipeline_sprite_3d.hpp"
-#include "blucat/renderer.hpp"
-#include "blucat/swapchain.hpp"
-
-extern std::random_device random_seed;
-extern std::mt19937 random_number_generator;
-
-/**
- * The Core class stores all global states that the engine needs to work.
- * Global variables are not evil if you use them carefully.
- */
-struct cg_sCore
-{
-  static const CommandChain loader;
-
-  Log::Logger log;
-
-  JobQueue job_queue;
-  std::vector<Worker> workers;
-  std::vector<std::thread> threads;
-
-  mrb_state *mrb;
-
-  std::string game_file;
-
-  /// mruby symbols
-  mrb_sym sym_config, sym_debug, sym_error, sym_fatal, sym_information,
-    sym_init, sym_key_down, sym_key_up, sym_quit, sym_tick, sym_trace,
-    sym_warning;
-
-  /// Text displayed in the game window.
-  std::string game_name;
-
-  /**
-   * @{
-   * This is the ammount of pixel that the games uses when rendering to the
-   * screen.
-   */
-  uint32_t display_width, display_height;
-  /// @}
-
-  int game_version_major, game_version_minor, game_version_patch;
-
-  Uint32 fps;
-  std::chrono::duration<long long, std::milli> max_frame_duration;
-  float delta_time;
-
-  SDL_Window *window;
-
-  FT_Library font_library;
-
-  VkSurfaceKHR window_surface;
-  VkInstance vk_instance;
-
-#ifdef DEBUG
-  VkDebugUtilsMessengerEXT vk_callback;
-#endif
-
-  // Vulkan devices.
-  std::vector<BluCat::Device> vk_devices;
-  BluCat::Device *vk_device_with_swapchain;
-  BluCat::Swapchain *vk_swapchain;
-
-  BluCat::Framebuffer *vk_framebuffer;
-  BluCat::RenderPass *vk_render_pass;
-  BluCat::DescriptorSetLayout *vk_descriptor_set_layout;
-  BluCat::GraphicsPipeline3DLayout *vk_graphics_pipeline_3d_layout;
-  BluCat::GraphicsPipeline2DSolidLayout *vk_graphics_pipeline_2d_solid_layout;
-  BluCat::GraphicsPipeline2DWiredLayout *vk_graphics_pipeline_2d_wired_layout;
-  BluCat::Light *vk_light;
-  std::unique_ptr<BluCat::GraphicsPipeline3D> vk_graphics_pipeline_3d;
-  std::unique_ptr<BluCat::GraphicsPipeline3DSkeletal>
-  vk_graphics_pipeline_3d_skeletal;
-  std::unique_ptr<BluCat::GraphicsPipelineSprite3D> vk_graphics_pipeline_sprite_3d;
-  std::unique_ptr<BluCat::GraphicsPipeline2DSolid> vk_graphics_pipeline_2d_solid;
-  std::unique_ptr<BluCat::GraphicsPipeline2DWired> vk_graphics_pipeline_2d_wired;
-
-  BluCat::Renderer *vk_renderer;
-
-  bool quit_game;
-};
-
-extern cg_sCore cg_core;
-
-#endif /* CANDY_GEAR_CORE_H */
diff --git a/src/view_2d.cpp b/src/view_2d.cpp
deleted file mode 100644
index 09cbac1..0000000
--- a/src/view_2d.cpp
+++ /dev/null
@@ -1,90 +0,0 @@
-/*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "view_2d.hpp"
-
-#include "sprite.hpp"
-#include "vector_4d.hpp"
-#include "view_3d.hpp"
-#include "blucat/sprite.hpp"
-#include "blucat/view_2d.hpp"
-
-void
-cg_free_view_2d(mrb_state *mrb, void* obj)
-{
-  auto ptr = static_cast<std::shared_ptr<BluCat::View2D>*>(obj);
-
-  ptr->~shared_ptr();
-  mrb_free(mrb, ptr);
-}
-
-const struct mrb_data_type cg_view_2d_type = { "CG_View2D", cg_free_view_2d };
-
-static mrb_value
-cg_cView2D_initialize(mrb_state *mrb, mrb_value self)
-{
-  std::shared_ptr<glm::vec4> *region;
-  mrb_float projection_width, projection_height;
-  std::shared_ptr<BluCat::View2D> *ptr;
-
-  mrb_get_args(mrb, "dff", &region, &cg_vector_4d_type,
-               &projection_width, &projection_height);
-  ptr = (std::shared_ptr<BluCat::View2D>*)DATA_PTR(self);
-  if(ptr) mrb_free(mrb, ptr);
-  ptr = (std::shared_ptr<BluCat::View2D>*)mrb_malloc(
-    mrb, sizeof(std::shared_ptr<BluCat::View2D>));
-
-  new(ptr)std::shared_ptr<BluCat::View2D>(
-    std::make_shared<BluCat::View2D>(
-      *region->get(), projection_width, projection_height));
-
-  mrb_data_init(self, ptr, &cg_view_2d_type);
-  return self;
-}
-
-BluCat::View2D*
-cg_cView_to_view_2d(mrb_state *mrb, mrb_value view_value)
-{
-  BluCat::View2D* view_2d;
-  const mrb_data_type *type = DATA_TYPE(view_value);
-
-  if(type == &cg_view_2d_type)
-    view_2d = static_cast<std::shared_ptr<BluCat::View2D>*>(
-      DATA_PTR(view_value))->get();
-  else if (type == &cg_view_3d_type)
-    view_2d = static_cast<BluCat::View2D*>(
-      static_cast<std::shared_ptr<BluCat::View3D>*>(
-        DATA_PTR(view_value))->get());
-  else
-    mrb_raisef(
-      mrb, E_TYPE_ERROR, "wrong argument type %s (expected %s or %s)",
-      type->struct_name, cg_view_2d_type.struct_name,
-      cg_view_3d_type.struct_name);
-
-  return view_2d;
-}
-
-void
-cg_view_2d_init(mrb_state *mrb)
-{
-  struct RClass *cg_m, *cg_cView2D;
-
-  cg_m = mrb_module_get(mrb, "CandyGear");
-  cg_cView2D = mrb_define_class_under(mrb, cg_m, "View2D", mrb->object_class);
-  MRB_SET_INSTANCE_TT(cg_cView2D, MRB_TT_DATA);
-  mrb_define_method(
-    mrb, cg_cView2D, "initialize", cg_cView2D_initialize, MRB_ARGS_REQ(3));
-}