model loading

.envrc

@@ -1,2 +1,2 @@
-PATH_add ./src/shaders
+PATH_add ./shaders
 use_flake

src/main.cpp

@@ -5,12 +5,17 @@
 #include <set>
 
 #define GLM_FORCE_DEPTH_ZERO_TO_ONE
+#define GLM_ENABLE_EXPERIMENTAL
 #include <glm/glm.hpp>
 #include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtx/hash.hpp>
 
 #define STB_IMAGE_IMPLEMENTATION
 #include <stb_image.h>
 
+#define TINYOBJLOADER_IMPLEMENTATION
+#include <tiny_obj_loader.h>
+
 #define VULKAN_HPP_DISPATCH_LOADER_DYNAMIC 1
 #define VK_ENABLE_BETA_EXTENSIONS
 #define VULKAN_HPP_NO_CONSTRUCTORS
@@ -26,6 +31,9 @@ VULKAN_HPP_DEFAULT_DISPATCH_LOADER_DYNAMIC_STORAGE
 constexpr i32 WIDTH  = 800;
 constexpr i32 HEIGHT = 600;
 
+constexpr const char* MODEL_PATH   = "models/viking_room.obj";
+constexpr const char* TEXTURE_PATH = "textures/viking_room.png";
+
 constexpr i32 MAX_FRAMES_IN_FLIGHT = 2;
 
 constexpr std::array<const char*, 1> validationLayers = { "VK_LAYER_KHRONOS_validation" };
@@ -59,25 +67,21 @@ struct Vertex {
        { 2, 0, vk::Format::eR32G32Sfloat, offsetof(Vertex, tex_coord) } }
     };
   }
+
+  fn operator==(const Vertex& other) const->bool {
+    return pos == other.pos && color == other.color && tex_coord == other.tex_coord;
+  }
 };
 
-constexpr std::array<Vertex, 8> vertices = {
-  { { { -0.5F, -0.5F, 0.0F }, { 1.0F, 0.0F, 0.0F }, { 0.0F, 0.0F } },
-   { { 0.5F, -0.5F, 0.0F }, { 0.0F, 1.0F, 0.0F }, { 1.0F, 0.0F } },
-   { { 0.5F, 0.5F, 0.0F }, { 0.0F, 0.0F, 1.0F }, { 1.0F, 1.0F } },
-   { { -0.5F, 0.5F, 0.0F }, { 1.0F, 1.0F, 1.0F }, { 0.0F, 1.0F } },
-   { { -0.5F, -0.5F, -0.5F }, { 1.0F, 0.0F, 0.0F }, { 0.0F, 0.0F } },
-   { { 0.5F, -0.5F, -0.5F }, { 0.0F, 1.0F, 0.0F }, { 1.0F, 0.0F } },
-   { { 0.5F, 0.5F, -0.5F }, { 0.0F, 0.0F, 1.0F }, { 1.0F, 1.0F } },
-   { { -0.5F, 0.5F, -0.5F }, { 1.0F, 1.0F, 1.0F }, { 0.0F, 1.0F } } }
+namespace std {
+  template <>
+  struct hash<Vertex> {
+    fn operator()(Vertex const& vertex) const->size_t {
+      return ((hash<glm::vec3>()(vertex.pos) ^ (hash<glm::vec3>()(vertex.color) << 1)) >> 1) ^
+             (hash<glm::vec2>()(vertex.tex_coord) << 1);
+    }
   };
-
-// clang-format off
-constexpr std::array<u16, 12> indices = {
-	0, 1, 2, 2, 3, 0,
-	4, 5, 6, 6, 7, 4
-};
-// clang-format on
+}
 
 class VulkanApp {
  public:
@@ -125,6 +129,8 @@ class VulkanApp {
   vk::UniqueImageView    mTextureImageView;
   vk::UniqueSampler      mTextureSampler;
 
+  std::vector<Vertex>    mVertices;
+  std::vector<u32>       mIndices;
   vk::UniqueBuffer       mVertexBuffer;
   vk::UniqueDeviceMemory mVertexBufferMemory;
   vk::UniqueBuffer       mIndexBuffer;
@@ -217,6 +223,7 @@ class VulkanApp {
     createTextureImage();
     createTextureImageView();
     createTextureSampler();
+    loadModel();
     createVertexBuffer();
     createIndexBuffer();
     createUniformBuffers();
@@ -520,8 +527,8 @@ class VulkanApp {
   }
 
   fn createGraphicsPipeline() -> void {
-    std::vector<char> vertShaderCode = readFile("src/shaders/vert.spv");
-    std::vector<char> fragShaderCode = readFile("src/shaders/frag.spv");
+    std::vector<char> vertShaderCode = readFile("shaders/vert.spv");
+    std::vector<char> fragShaderCode = readFile("shaders/frag.spv");
 
     vk::UniqueShaderModule vertShaderModule = createShaderModule(vertShaderCode);
     vk::UniqueShaderModule fragShaderModule = createShaderModule(fragShaderCode);
@@ -697,7 +704,7 @@ class VulkanApp {
 
   fn createTextureImage() -> void {
     i32 texWidth = 0, texHeight = 0, texChannels = 0;
-    u8* pixels = stbi_load("src/textures/texture.jpg", &texWidth, &texHeight, &texChannels, STBI_rgb_alpha);
+    u8* pixels = stbi_load(TEXTURE_PATH, &texWidth, &texHeight, &texChannels, STBI_rgb_alpha);
 
     vk::DeviceSize imageSize =
       static_cast<vk::DeviceSize>(texWidth) * static_cast<vk::DeviceSize>(texHeight) * 4;
@@ -899,8 +906,44 @@ class VulkanApp {
     endSingleTimeCommands(std::move(commandBuffer));
   }
 
+  fn loadModel() -> void {
+    tinyobj::attrib_t                attrib;
+    std::vector<tinyobj::shape_t>    shapes;
+    std::vector<tinyobj::material_t> materials;
+    std::string                      warn, err;
+
+    if (!tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err, MODEL_PATH))
+      throw std::runtime_error(warn + err);
+
+    std::unordered_map<Vertex, u32> uniqueVertices {};
+
+    for (const tinyobj::shape_t& shape : shapes) {
+      for (const tinyobj::index_t& index : shape.mesh.indices) {
+        Vertex vertex {
+          .pos = {
+            attrib.vertices[static_cast<u32>(3 * index.vertex_index + 0)],
+            attrib.vertices[static_cast<u32>(3 * index.vertex_index + 1)],
+            attrib.vertices[static_cast<u32>(3 * index.vertex_index + 2)],
+          },
+          .color = { 1.0F, 1.0F, 1.0F },
+          .tex_coord = {
+            attrib.texcoords[static_cast<u32>(2 * index.texcoord_index + 0)],
+            1.0F - attrib.texcoords[static_cast<u32>(2 * index.texcoord_index + 1)],
+          }
+        };
+
+        if (!uniqueVertices.contains(vertex)) {
+          uniqueVertices[vertex] = static_cast<u32>(mVertices.size());
+          mVertices.push_back(vertex);
+        }
+
+        mIndices.push_back(uniqueVertices[vertex]);
+      }
+    }
+  }
+
   fn createVertexBuffer() -> void {
-    vk::DeviceSize bufferSize = sizeof(vertices[0]) * vertices.size();
+    vk::DeviceSize bufferSize = sizeof(mVertices[0]) * mVertices.size();
 
     vk::UniqueBuffer       stagingBuffer;
     vk::UniqueDeviceMemory stagingBufferMemory;
@@ -913,7 +956,7 @@ class VulkanApp {
       stagingBufferMemory
     );
 
-    copyData(stagingBufferMemory.get(), bufferSize, vertices.data());
+    copyData(stagingBufferMemory.get(), bufferSize, mVertices.data());
 
     createBuffer(
       bufferSize,
@@ -930,7 +973,7 @@ class VulkanApp {
   }
 
   fn createIndexBuffer() -> void {
-    vk::DeviceSize bufferSize = sizeof(indices[0]) * indices.size();
+    vk::DeviceSize bufferSize = sizeof(mIndices[0]) * mIndices.size();
 
     vk::UniqueBuffer       stagingBuffer;
     vk::UniqueDeviceMemory stagingBufferMemory;
@@ -943,7 +986,7 @@ class VulkanApp {
       stagingBufferMemory
     );
 
-    copyData(stagingBufferMemory.get(), bufferSize, indices.data());
+    copyData(stagingBufferMemory.get(), bufferSize, mIndices.data());
 
     createBuffer(
       bufferSize,
@@ -1170,7 +1213,7 @@ class VulkanApp {
 
     commandBuffer.bindVertexBuffers(0, mVertexBuffer.get(), { 0 });
 
-    commandBuffer.bindIndexBuffer(mIndexBuffer.get(), 0, vk::IndexType::eUint16);
+    commandBuffer.bindIndexBuffer(mIndexBuffer.get(), 0, vk::IndexType::eUint32);
 
     commandBuffer.bindDescriptorSets(
       vk::PipelineBindPoint::eGraphics,
@@ -1182,7 +1225,7 @@ class VulkanApp {
       nullptr
     );
 
-    commandBuffer.drawIndexed(static_cast<u32>(indices.size()), 1, 0, 0, 0);
+    commandBuffer.drawIndexed(static_cast<u32>(mIndices.size()), 1, 0, 0, 0);
 
     commandBuffer.endRenderPass();