Playing with cgltf(not much success though)

Makefile

@@ -1,4 +1,5 @@
-CFLAGS = -fsanitize=address -I/usr/local/include -O0 -g -Wall -Wextra
+ROOT_DIR:=$(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))
+CFLAGS = -fsanitize=address -I $(ROOT_DIR)/include -I/usr/local/include -O0 -g -Wall -Wextra
 LDFLAGS = -L/usr/local/lib -lglfw -lvulkan -ldl -Xlinker -rpath -Xlinker /usr/local/lib
 CC = clang
 GDB = lldb

src/main.c

@@ -16,6 +16,9 @@
 #include <stdio.h>
 #include <string.h>
 
+#define CGLTF_IMPLEMENTATION
+#include <cgltf.h>
+
 typedef struct QueueIndicesStruct {
   uint32_t graphics_family;
   uint32_t graphics_index;
@@ -1611,7 +1614,7 @@ VkPipeline create_graphics_pipeline(
   raster_info.rasterizerDiscardEnable = VK_FALSE;
   raster_info.polygonMode = VK_POLYGON_MODE_FILL;
   raster_info.lineWidth = 1.0f;
-  raster_info.cullMode = VK_CULL_MODE_BACK_BIT;
+  raster_info.cullMode = VK_CULL_MODE_NONE;
   raster_info.frontFace = VK_FRONT_FACE_CLOCKWISE;
   raster_info.depthBiasEnable = VK_FALSE;
   raster_info.depthBiasConstantFactor = 0.0f;
@@ -2071,6 +2074,123 @@ Object create_renderable(Mesh* mesh, Material* material, uint32_t descriptor_set
   return object;
 }
 
+struct VertexMesh {
+  struct Vertex* vertex;
+  uint32_t vertex_count;
+
+  uint16_t* index;
+  uint32_t index_count;
+};
+
+struct VertexMesh* load_vertex_gltf(char* filename) {
+  cgltf_options options = {0};
+  cgltf_data* data = NULL;
+  cgltf_result result = cgltf_parse_file(&options, filename, &data);
+  if(result != cgltf_result_success) {
+    fprintf(stderr, "failed to load %s\n", filename);
+    return 0;
+  }
+
+  result = cgltf_load_buffers(&options, data, filename);
+  if(result != cgltf_result_success) {
+    fprintf(stderr, "failed to load buffers from %s\n", filename);
+    goto free_cgltf;
+  }
+
+  if(data->meshes_count != 1) {
+    fprintf(stderr, "cannot load more than 1 mesh from gltf\n");
+    goto free_cgltf;
+  }
+
+  cgltf_mesh mesh = data->meshes[0];
+  if(mesh.primitives_count != 1) {
+    fprintf(stderr, "cannot load more than 1 primitive from gltf\n");
+    goto free_cgltf;
+  }
+
+  cgltf_primitive prim = mesh.primitives[0];
+  if(prim.type != cgltf_primitive_type_triangles) {
+    fprintf(stderr, "cannot load non-triangles from gltf\n");
+    goto free_cgltf;
+  }
+
+  cgltf_attribute* color = NULL;
+  cgltf_attribute* position = NULL;
+  for(uint32_t i = 0; i < prim.attributes_count; i++) {
+    cgltf_attribute attribute = prim.attributes[i];
+    switch(attribute.type) {
+    case cgltf_attribute_type_color:
+      color = &prim.attributes[i];
+      break;
+    case cgltf_attribute_type_position:
+      position = &prim.attributes[i];
+      break;
+    default:
+      break;
+    }
+  }
+
+  if(color == NULL || position == NULL) {
+    fprintf(stderr, "could not find color or position attributes in gltf\n");
+    goto free_cgltf;
+  }
+
+  uint32_t vertex_count = position->data->count;
+  struct Vertex* vertices = malloc(sizeof(struct Vertex)*vertex_count);
+  if(vertices == 0) {
+    fprintf(stderr, "failed to callocate vertex buffer of size %d\n", vertex_count);
+    goto free_cgltf;
+  }
+
+  cgltf_float* pos = malloc(sizeof(cgltf_float)*vertex_count*3);
+  cgltf_accessor_unpack_floats(position->data, pos, vertex_count*3);
+
+  const uint8_t* color_vec = cgltf_buffer_view_data(color->data->buffer_view);
+  struct Vertex* vertex_data = malloc(sizeof(struct Vertex)*vertex_count);
+  if(vertex_data == 0) {
+    fprintf(stderr, "failed to allocate vertex data buffer\n");
+    goto free_cgltf;
+  }
+  for(cgltf_size i = 0; i < vertex_count; i++) {
+    uint16_t* colors = (uint16*)(&color_vec[2*4*i]);
+    struct Vertex v = {
+      .pos = {
+        pos[3*i + 0],
+        pos[3*i + 0],
+        pos[3*i + 0],
+      },
+      .color = {
+        ((float)colors[0])/(float)UINT16_MAX,
+        ((float)colors[1])/(float)UINT16_MAX,
+        ((float)colors[2])/(float)UINT16_MAX,
+      },
+    };
+    vertex_data[i] = v;
+  }
+
+  uint32_t index_count = prim.indices->count;
+  uint16_t* indices = malloc(sizeof(uint16_t)*index_count);
+  if(indices == 0) {
+    fprintf(stderr, "failed to allocate index data buffer\n");
+    goto free_vertex;
+  }
+  cgltf_accessor_unpack_indices(prim.indices, indices, 2, prim.indices->count);
+
+  struct VertexMesh* ret = malloc(sizeof(struct VertexMesh));
+  ret->vertex_count = vertex_count;
+  ret->vertex = vertex_data;
+  ret->index_count = index_count;
+  ret->index = indices;
+
+  return ret;
+
+free_vertex:
+  free(vertex_data);
+free_cgltf:
+  cgltf_free(data);
+  return 0;
+}
+
 Mesh* load_simple_mesh(VkPhysicalDeviceMemoryProperties memories, VkDevice device, struct Vertex* vertices, uint32_t vertex_count, uint16_t* indices, uint32_t index_count, VkCommandPool transfer_pool, VkQueue transfer_queue) {
   AllocatedBuffer vertex_buffer = create_populated_buffer(memories, device, (void*)vertices, sizeof(struct Vertex) * vertex_count, transfer_pool, transfer_queue, VK_BUFFER_USAGE_VERTEX_BUFFER_BIT);
   if(vertex_buffer.memory == VK_NULL_HANDLE) {
@@ -3085,7 +3205,7 @@ VkResult draw_frame(VulkanContext* context, SceneContext* scene, uint32_t materi
 Object create_simple_mesh_object(Material* simple_mesh_material, VkPhysicalDeviceMemoryProperties memories, VkDevice device, VkCommandPool transfer_pool, VkQueue transfer_queue, uint32_t max_frames_in_flight, VkDescriptorPool pool) {
   Object zero = {};
 
-  Mesh* mesh = load_simple_mesh(memories, device, (struct Vertex*)vertices, 4, (uint16_t*)indices, 6, transfer_pool, transfer_queue);
+  Mesh* mesh = load_simple_mesh(memories, device, vertices, 4, indices, 6, transfer_pool, transfer_queue);
   if(mesh == 0) {
     return zero;
   }
@@ -3126,12 +3246,12 @@ Object create_simple_mesh_object(Material* simple_mesh_material, VkPhysicalDevic
     return zero;
   }
   glm_quat_identity(position->rotation);
-  position->scale[0] = 1.f;
-  position->scale[1] = 1.f;
-  position->scale[2] = 1.f;
+  position->scale[0] = 10.f;
+  position->scale[1] = 10.f;
+  position->scale[2] = 10.f;
   position->position[0] = 0.0f;
   position->position[1] = 0.0f;
-  position->position[2] = 0.0f;
+  position->position[2] = 1.1f;
   bool map_result = map_add(&object.attributes, ATTRIBUTE_ID_POSITION, position);
   if(map_result == 0) {
     return zero;
@@ -3457,6 +3577,12 @@ void cleanup(GLFWwindow* window, VulkanContext* context) {
 }
 
 int main() {
+  struct VertexMesh* loaded_gltf = load_vertex_gltf("spaceship.glb");
+  if(loaded_gltf == 0) {
+    fprintf(stderr, "failed to load gltf %s\n", "spaceship.glb");
+    return -1;
+  }
+
   GLFWwindow* window = init_window(800, 600);
   if(window == 0) {
     fprintf(stderr, "failed to initialize glfw window\n");