From d7d79214a93bc96b38ac018aad4c8d5ee88d51ca Mon Sep 17 00:00:00 2001
From: Frederico Linhares <fred@linhares.blue>
Date: Tue, 27 Sep 2022 17:38:20 -0300
Subject: feat Allow multiple textures to be used with the same mesh

---
 src/vk/mesh.cpp | 161 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 src/vk/mesh.cpp

(limited to 'src/vk/mesh.cpp')

diff --git a/src/vk/mesh.cpp b/src/vk/mesh.cpp
new file mode 100644
index 0000000..70b9d45
--- /dev/null
+++ b/src/vk/mesh.cpp
@@ -0,0 +1,161 @@
+/*
+ * 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 "mesh.hpp"
+
+#include <array>
+#include <fstream>
+
+#include "../command.hpp"
+#include "../core.hpp"
+#include "vertex_3d.hpp"
+
+namespace
+{
+
+// Data that is only needed for the command chain but not for the Mesh goes
+// here.
+struct MeshBuilder
+{
+  std::string mesh_path;
+  VK::Mesh *mesh;
+
+  MeshBuilder(VK::Mesh *m, std::string mp);
+  MeshBuilder(VK::Mesh *m, const char* mp);
+};
+
+MeshBuilder::MeshBuilder(VK::Mesh *m, std::string mp):
+  mesh{m},
+  mesh_path{mp}
+{
+}
+
+MeshBuilder::MeshBuilder(VK::Mesh *m, const char *mp):
+  MeshBuilder{m, std::string(mp)}
+{
+}
+
+uint32_t read_uint32_from_file(std::ifstream &input_file)
+{
+  uint32_t data{};
+  input_file.read((char*)&data, sizeof(uint32_t));
+  return data;
+}
+
+glm::vec2 read_vec2_from_file(std::ifstream &input_file)
+{
+  glm::vec2 data{};
+  input_file.read((char*)&data.x, sizeof(glm::vec2::value_type));
+  input_file.read((char*)&data.y, sizeof(glm::vec2::value_type));
+  return data;
+}
+
+glm::vec3 read_vec3_from_file(std::ifstream &input_file)
+{
+  glm::vec3 data{};
+  input_file.read((char*)&data.x, sizeof(glm::vec3::value_type));
+  input_file.read((char*)&data.y, sizeof(glm::vec3::value_type));
+  input_file.read((char*)&data.z, sizeof(glm::vec3::value_type));
+  return data;
+}
+
+void
+load_mesh(void *obj)
+{
+  auto self = static_cast<MeshBuilder*>(obj);
+
+  std::ifstream input_file{self->mesh_path};
+  if(!input_file.is_open()) throw CommandError{"Failed to open file."};
+
+  self->mesh->queue_family =
+    cg_core.vk_device_with_swapchain->get_queue_family_with_graphics();
+
+  // Load vertexes.
+  {
+    auto vertex_count{read_uint32_from_file(input_file)};
+    std::vector<VK::Vertex3D> vertexes{vertex_count};
+
+    for(auto i{0}; i < vertex_count; i++)
+    {
+      vertexes[i].position = read_vec3_from_file(input_file);
+      vertexes[i].normal = read_vec3_from_file(input_file);
+      vertexes[i].texture_coord = read_vec2_from_file(input_file);
+    }
+
+    void *vertexes_data{vertexes.data()};
+    size_t vertexes_size = sizeof(vertexes[0]) * vertexes.size();
+    self->mesh->source_vertex_buffer = new VK::SourceBuffer{
+      self->mesh->queue_family->device, vertexes_data, vertexes_size};
+    self->mesh->vertex_buffer = new VK::DestinationBuffer{
+      self->mesh->queue_family, self->mesh->source_vertex_buffer,
+      VK_BUFFER_USAGE_VERTEX_BUFFER_BIT};
+  }
+
+  // Load indexes.
+  {
+    self->mesh->index_count = read_uint32_from_file(input_file);
+    std::vector<uint32_t> indexes(self->mesh->index_count);
+
+    for(auto i{0}; i < self->mesh->index_count; i++)
+      indexes[i] = read_uint32_from_file(input_file);
+
+    void *indexes_data{indexes.data()};
+    size_t indexes_size{sizeof(indexes[0]) * indexes.size()};
+    VK::SourceBuffer source_index_buffer{
+      self->mesh->queue_family->device, indexes_data, indexes_size};
+    self->mesh->index_buffer = new VK::DestinationBuffer{
+      self->mesh->queue_family, &source_index_buffer,
+      VK_BUFFER_USAGE_INDEX_BUFFER_BIT};
+  }
+}
+
+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 VK
+{
+
+Mesh::Mesh(std::string mesh_path)
+{
+  MeshBuilder mesh_builder(this, mesh_path);
+  loader.execute(&mesh_builder);
+}
+
+Mesh::Mesh(const char* mesh_path):
+  Mesh{std::string(mesh_path)}
+{
+}
+
+Mesh::~Mesh()
+{
+  MeshBuilder mesh_builder(this, "");
+  loader.revert(&mesh_builder);
+}
+
+}
-- 
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