feat Make camera and model instance more abstract

* src/camera.cpp src/camera.hpp: Remove the camera as Vector3D and
Rotation3D are going to replace it.
* src/model.cpp: Add draw command as instances do not exist anymore.
* src/model/instance.cpp src/model/instance.hpp: Remove the instance as
Vector3D and Rotation3D are going to replace it.

1 files changed, 176 insertions, 0 deletions

diff --git a/src/vector3d.cpp b/src/vector3d.cpp
new file mode 100644
index 0000000..a2e0e4c
--- /dev/null
+++ b/src/vector3d.cpp
@@ -0,0 +1,176 @@
+/*
+ * Copyright 2022 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 "vector3d.hpp"
+
+#include <memory>
+
+#include <glm/vec3.hpp>
+
+#include "rotation3d.hpp"
+
+void
+cg_free_vector3d(mrb_state *mrb, void* obj)
+{
+  auto ptr = static_cast<std::shared_ptr<glm::vec3>*>(obj);
+
+  ptr->~shared_ptr();
+  mrb_free(mrb, ptr);
+}
+
+const struct mrb_data_type cg_vector3d_type = {
+  "CG_Vector3D", cg_free_vector3d};
+
+static mrb_value
+cg_cVector3D_initialize(mrb_state *mrb, mrb_value self)
+{
+  mrb_float x = 0.0f;
+  mrb_float y = 0.0f;
+  mrb_float z = 0.0f;
+  std::shared_ptr<glm::vec3> *ptr;
+
+  mrb_get_args(mrb, "|fff", &x, &y, &z);
+  ptr = (std::shared_ptr<glm::vec3>*)DATA_PTR(self);
+  if(ptr) mrb_free(mrb, ptr);
+  ptr = (std::shared_ptr<glm::vec3>*)mrb_malloc(
+    mrb, sizeof(std::shared_ptr<glm::vec3>));
+
+  new(ptr)std::shared_ptr<glm::vec3>(std::make_shared<glm::vec3>(x, y, z));
+
+  mrb_data_init(self, ptr, &cg_vector3d_type);
+  return self;
+}
+
+mrb_value
+cg_cVector3D_get_x(mrb_state *mrb, mrb_value self)
+{
+  std::shared_ptr<glm::vec3> *ptr =
+    (std::shared_ptr<glm::vec3>*)DATA_PTR(self);
+
+  return mrb_float_value(mrb, (*ptr)->x);
+}
+
+mrb_value
+cg_cVector3D_get_y(mrb_state *mrb, mrb_value self)
+{
+  std::shared_ptr<glm::vec3> *ptr =
+    (std::shared_ptr<glm::vec3>*)DATA_PTR(self);
+
+  return mrb_float_value(mrb, (*ptr)->y);
+}
+
+mrb_value
+cg_cVector3D_get_z(mrb_state *mrb, mrb_value self)
+{
+  std::shared_ptr<glm::vec3> *ptr =
+    (std::shared_ptr<glm::vec3>*)DATA_PTR(self);
+
+  return mrb_float_value(mrb, (*ptr)->z);
+}
+
+static mrb_value
+cg_cVector3D_set_x(mrb_state *mrb, mrb_value self)
+{
+  mrb_float x;
+  std::shared_ptr<glm::vec3> *ptr =
+    (std::shared_ptr<glm::vec3>*)DATA_PTR(self);
+
+  mrb_get_args(mrb, "f", &x);
+  (*ptr)->x = x;
+
+  return self;
+}
+
+static mrb_value
+cg_cVector3D_set_y(mrb_state *mrb, mrb_value self)
+{
+  mrb_float y;
+  std::shared_ptr<glm::vec3> *ptr =
+    (std::shared_ptr<glm::vec3>*)DATA_PTR(self);
+
+  mrb_get_args(mrb, "f", &y);
+  (*ptr)->y = y;
+
+  return self;
+}
+
+static mrb_value
+cg_cVector3D_set_z(mrb_state *mrb, mrb_value self)
+{
+  mrb_float z;
+  std::shared_ptr<glm::vec3> *ptr =
+    (std::shared_ptr<glm::vec3>*)DATA_PTR(self);
+
+  mrb_get_args(mrb, "f", &z);
+  (*ptr)->z = z;
+
+  return self;
+}
+
+static mrb_value
+cg_cVector3D_translate(mrb_state *mrb, mrb_value self)
+{
+  std::shared_ptr<glm::vec3> *ptr =
+    (std::shared_ptr<glm::vec3>*)DATA_PTR(self);
+  std::shared_ptr<glm::vec3> *direction, *rotation;
+
+  mrb_get_args(
+    mrb, "dd", &direction, &cg_vector3d_type, &rotation, &cg_rotation3d_type);
+
+  glm::mat4 matrix{1.0f};
+  glm::vec4 vec{(**direction), 1.0f};
+  matrix = glm::rotate(matrix, (*rotation)->y, glm::vec3{0.0f, 1.0f, 0.0f});
+  matrix = glm::rotate(matrix, (*rotation)->x, glm::vec3{1.0f, 0.0f, 0.0f});
+  matrix = glm::rotate(matrix, (*rotation)->z, glm::vec3{0.0f, 0.0f, 1.0f});
+  vec = matrix * vec;
+
+  (*ptr)->x += vec.x;
+  (*ptr)->y += vec.y;
+  (*ptr)->z += vec.z;
+
+  return self;
+}
+
+void
+cg_vector3d_init(mrb_state *mrb)
+{
+  struct RClass *cg_m, *cg_cVector3D;
+
+  cg_m = mrb_module_get(mrb, "CandyGear");
+  cg_cVector3D = mrb_define_class_under(
+    mrb, cg_m, "Vector3D", mrb->object_class);
+  MRB_SET_INSTANCE_TT(cg_cVector3D, MRB_TT_DATA);
+  mrb_define_method(
+    mrb, cg_cVector3D, "initialize", cg_cVector3D_initialize,
+    MRB_ARGS_NONE()|MRB_ARGS_OPT(3));
+
+  mrb_define_method(
+    mrb, cg_cVector3D, "x", cg_cVector3D_get_x, MRB_ARGS_NONE());
+  mrb_define_method(
+    mrb, cg_cVector3D, "y", cg_cVector3D_get_y, MRB_ARGS_NONE());
+  mrb_define_method(
+    mrb, cg_cVector3D, "z", cg_cVector3D_get_z, MRB_ARGS_NONE());
+
+  mrb_define_method(
+    mrb, cg_cVector3D, "x=", cg_cVector3D_set_x, MRB_ARGS_REQ(1));
+  mrb_define_method(
+    mrb, cg_cVector3D, "y=", cg_cVector3D_set_y, MRB_ARGS_REQ(1));
+  mrb_define_method(
+    mrb, cg_cVector3D, "z=", cg_cVector3D_set_z, MRB_ARGS_REQ(1));
+
+  mrb_define_method(
+    mrb, cg_cVector3D, "translate", cg_cVector3D_translate, MRB_ARGS_REQ(2));
+}