Switched to using push constants for model matrices

shader_src/basic.vert

@@ -3,22 +3,19 @@
 layout( push_constant ) uniform constants {
   mat4 view;
   mat4 proj;
+  mat4 model;
 } scene;
 
 layout(set = 0, binding = 0) uniform SceneUniform {
   mat4 test;
 } scene_ubo;
 
-layout(set = 2, binding = 0) uniform ModelUniform {
-  mat4 model;
-} model_ubo;
-
 layout(location = 0) in vec3 inPosition;
 layout(location = 1) in vec3 inColor;
 
 layout(location = 0) out vec3 fragColor;
 
 void main() {
-  gl_Position = scene.proj * scene.view * model_ubo.model * vec4(inPosition, 1.0);
+  gl_Position = scene.proj * scene.view * scene.model * vec4(inPosition, 1.0);
   fragColor = inColor;
 }

shader_src/texture.vert

@@ -3,16 +3,13 @@
 layout( push_constant ) uniform constants {
   mat4 view;
   mat4 proj;
+  mat4 model;
 } scene_pc;
 
 layout(set = 0, binding = 0) uniform SceneUniformBuffer {
   mat4 test;
 } scene_ubo;
 
-layout(set = 2, binding = 1) uniform ObjectUniformBuffer {
-  mat4 model;
-} object_ubo;
-
 layout(location = 0) in vec3 inPosition;
 layout(location = 1) in vec3 inColor;
 layout(location = 2) in vec2 inTex;
@@ -21,7 +18,7 @@ layout(location = 0) out vec3 fragColor;
 layout(location = 1) out vec2 fragTex;
 
 void main() {
-  gl_Position = scene_pc.proj * scene_pc.view * object_ubo.model * vec4(inPosition, 1.0);
+  gl_Position = scene_pc.proj * scene_pc.view * scene_pc.model * vec4(inPosition, 1.0);
   fragColor = inColor;
   fragTex = inTex;
 }

src/main.c

@@ -91,6 +91,7 @@ typedef struct MappingStruct {
 #define ATTRIBUTE_ID_DESCRIPTORS     0x00000003 // void***(array of array of data pointers)
 #define ATTRIBUTE_ID_DESCRIPTOR_SETS 0x00000004 // VkDescriptorSet*
 #define ATTRIBUTE_ID_POSITION        0x00000005 // Position*
+#define ATTRIBUTE_ID_PUSH_CONSTANTS  0x00000006 // void*
 
 typedef struct ObjectStruct {
   Map      attributes;
@@ -105,13 +106,16 @@ typedef struct MeshTypeStruct {
   VkVertexInputAttributeDescription* attributes;
 } MeshType;
 
-// Defines what descriptors are bound at two different upate rates for the pipeline
 typedef struct PipelineLayoutStruct {
   uint32_t                      object_bindings_count;
   VkDescriptorSetLayoutBinding* object_bindings;
 
   uint32_t                      material_bindings_count;
   VkDescriptorSetLayoutBinding* material_bindings;
+
+  uint32_t object_pcr_size;
+  uint32_t material_pcr_size;
+  Mapping object_pcr_mapping;
 } PipelineLayout;
 
 typedef struct MeshStruct {
@@ -134,6 +138,9 @@ typedef struct MaterialStruct {
   uint32_t         material_descriptors_count;
 
   Map              object_descriptor_mappings;
+
+  PipelineLayout pipeline_layout;
+  void* material_pcr_ptr;
 } Material;
 
 typedef struct VulkanContextStruct {
@@ -190,7 +197,7 @@ typedef struct SceneContextStruct {
   VkDescriptorSet*      descriptors;
   GPUBuffer*            ubos;
   void**                ubo_ptrs;
-  VkPushConstantRange   pcr;
+  uint32_t              pcr_size;
 } SceneContext;
 
 struct TextureVertex {
@@ -208,6 +215,10 @@ struct ModelUBO {
   mat4 model;
 };
 
+struct ObjectPC {
+  mat4 model;
+};
+
 struct SceneUBO {
   mat4 test;
 };
@@ -1550,11 +1561,22 @@ void command_draw_object(Material material, Object object, uint32_t frame_num, V
 
   Mesh* mesh = maybe_mesh.value;
 
-  VkBuffer vertex_buffers[] = {mesh->vertex_buffer.handle};
+  if(material.pipeline_layout.object_pcr_size > 0) {
-  VkDeviceSize offsets[] = {0};
+    MaybeValue maybe_attribute = map_lookup(object.attributes, material.pipeline_layout.object_pcr_mapping.index);
+    if(maybe_attribute.has_value == false) {
+      return;
+    }
 
-  vkCmdBindVertexBuffers(command_buffer, 0, 1, vertex_buffers, offsets);
+    MaybeValue maybe_pc = map_lookup(object.attributes, ATTRIBUTE_ID_PUSH_CONSTANTS);
-  vkCmdBindIndexBuffer(command_buffer, mesh->index_buffer.handle, 0, VK_INDEX_TYPE_UINT16);
+    if(maybe_pc.has_value == false) {
+      return;
+    }
+
+    void** pc_ptrs = maybe_pc.value;
+
+    mapping_functions[material.pipeline_layout.object_pcr_mapping.mapping_type](pc_ptrs[frame_num], maybe_attribute.value);
+    vkCmdPushConstants(command_buffer, material.layout, VK_SHADER_STAGE_VERTEX_BIT, sizeof(struct ScenePC) + material.pipeline_layout.material_pcr_size, material.pipeline_layout.object_pcr_size, pc_ptrs[frame_num]);
+  }
 
   if(material.object_set_layout != VK_NULL_HANDLE) {
     MaybeValue maybe_descriptors = map_lookup(object.attributes, ATTRIBUTE_ID_DESCRIPTOR_SETS);
@@ -1564,16 +1586,25 @@ void command_draw_object(Material material, Object object, uint32_t frame_num, V
 
     VkDescriptorSet* descriptor_sets = maybe_descriptors.value;
     vkCmdBindDescriptorSets(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, material.layout, 2, 1, &descriptor_sets[frame_num], 0, 0);
-  } else {
-    fprintf(stderr, "test\n");
   }
 
+  VkBuffer vertex_buffers[] = {mesh->vertex_buffer.handle};
+  VkDeviceSize offsets[] = {0};
+
+  vkCmdBindVertexBuffers(command_buffer, 0, 1, vertex_buffers, offsets);
+  vkCmdBindIndexBuffer(command_buffer, mesh->index_buffer.handle, 0, VK_INDEX_TYPE_UINT16);
+
   vkCmdDrawIndexed(command_buffer, mesh->index_count, 1, 0, 0, 0);
 }
 
 void command_draw_material(Material material, uint32_t object_count, Object* objects, uint32_t frame_num, VkDescriptorSet* scene_descriptors, struct ScenePC* scene_constants, VkCommandBuffer command_buffer) {
   vkCmdBindPipeline(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, material.pipeline);
   vkCmdPushConstants(command_buffer, material.layout, VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(struct ScenePC), scene_constants);
+
+  if(material.material_pcr_ptr != NULL && material.pipeline_layout.material_pcr_size > 0) {
+    vkCmdPushConstants(command_buffer, material.material_pcr_ptr, VK_SHADER_STAGE_VERTEX_BIT, sizeof(struct ScenePC), material.pipeline_layout.material_pcr_size, material.material_pcr_ptr);
+  }
+
   vkCmdBindDescriptorSets(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, material.layout, 0, 1, &scene_descriptors[frame_num], 0, 0);
   if(material.material_descriptors != 0) {
     vkCmdBindDescriptorSets(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, material.layout, 1, 1, &material.material_descriptors[frame_num], 0, 0);
@@ -1737,13 +1768,22 @@ Object create_object(uint32_t max_frames_in_flight, uint32_t descriptor_count) {
   return ret;
 }
 
-Object create_renderable(Mesh* mesh, Material* material, uint32_t descriptor_sets_count, VkDescriptorSet* descriptor_sets, uint32_t max_frames_in_flight) {
+Object create_renderable(Mesh* mesh, Material* material, uint32_t descriptor_sets_count, VkDescriptorSet* descriptor_sets, uint32_t pc_size, uint32_t max_frames_in_flight) {
   Object zero = {
     .attributes = {
       .buckets = 0,
     },
   };
 
+  void** pc_ptrs = malloc(sizeof(void*)*max_frames_in_flight);
+  if(pc_ptrs == NULL) {
+    return zero;
+  }
+
+  for(uint32_t i = 0; i < max_frames_in_flight; i++) {
+    pc_ptrs[i] = malloc(pc_size);
+  }
+
   Object object = create_object(max_frames_in_flight, descriptor_sets_count);
   if(object.attributes.buckets == 0) {
     return zero;
@@ -1770,6 +1810,13 @@ Object create_renderable(Mesh* mesh, Material* material, uint32_t descriptor_set
     map_destroy(object.attributes);
     return zero;
   }
+
+  result = map_add(&object.attributes, ATTRIBUTE_ID_PUSH_CONSTANTS, pc_ptrs);
+  if(result == false) {
+    map_destroy(object.attributes);
+    return zero;
+  }
+
   return object;
 }
 
@@ -1780,7 +1827,7 @@ Material create_material(
     uint32_t shader_stage_count,
     VkPipelineShaderStageCreateInfo* shader_stages,
     VkDescriptorSetLayout scene_ubo_layout,
-    VkPushConstantRange scene_pcr,
+    uint32_t scene_pcr_size,
     PipelineLayout pipeline_layout,
     MeshType mesh_type,
     uint32_t max_frames_in_flight,
@@ -1876,13 +1923,19 @@ Material create_material(
   }
   VkDescriptorSetLayout all_layouts[3] = {scene_ubo_layout, material_set_layout, object_set_layout};
 
+  VkPushConstantRange pcr = {
+    .stageFlags = VK_SHADER_STAGE_VERTEX_BIT,
+    .offset = 0,
+    .size = scene_pcr_size + pipeline_layout.material_pcr_size + pipeline_layout.object_pcr_size,
+  };
+
   VkPipelineLayout layout;
   VkPipelineLayoutCreateInfo layout_info = {
     .sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
     .setLayoutCount = 3,
     .pSetLayouts = all_layouts,
     .pushConstantRangeCount = 1,
-    .pPushConstantRanges = &scene_pcr,
+    .pPushConstantRanges = &pcr,
   };
 
   result = vkCreatePipelineLayout(device, &layout_info, 0, &layout);
@@ -1906,12 +1959,14 @@ Material create_material(
     .material_descriptor_pool = material_descriptor_pool,
     .material_descriptors_count = max_frames_in_flight,
     .object_descriptor_mappings = object_descriptor_mappings,
+
+    .pipeline_layout = pipeline_layout,
   };
 
   return material;
 }
 
-Material create_simple_mesh_material(VkDevice device, VkExtent2D extent, VkRenderPass render_pass, VkDescriptorSetLayout scene_ubo_layout, VkPushConstantRange scene_pcr, uint32_t max_frames_in_flight) {
+Material create_simple_mesh_material(VkDevice device, VkExtent2D extent, VkRenderPass render_pass, VkDescriptorSetLayout scene_ubo_layout, uint32_t scene_pcr_size, uint32_t max_frames_in_flight) {
   VkShaderModule vert_shader = load_shader_file("shader_src/basic.vert.spv", device);
   VkShaderModule frag_shader = load_shader_file("shader_src/basic.frag.spv", device);
   VkPipelineShaderStageCreateInfo shader_stages[2] = {
@@ -1929,7 +1984,6 @@ Material create_simple_mesh_material(VkDevice device, VkExtent2D extent, VkRende
     },
   };
 
-
   VkVertexInputBindingDescription bindings[1] = {
     {
       .binding = 0, // Which buffer 'binding' to use
@@ -1960,58 +2014,21 @@ Material create_simple_mesh_material(VkDevice device, VkExtent2D extent, VkRende
     .attributes_count = sizeof(attributes)/sizeof(VkVertexInputAttributeDescription),
   };
 
-  VkDescriptorSetLayoutBinding object_set_bindings[] = {
-    {
-      .binding = 0,
-      .descriptorCount = 1,
-      .descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
-      .pImmutableSamplers = 0,
-      .stageFlags = VK_SHADER_STAGE_VERTEX_BIT,
-    },
-  };
-
   PipelineLayout simple_layout = {
-    .object_bindings = object_set_bindings,
+    .object_pcr_size = sizeof(struct ObjectPC),
-    .object_bindings_count = sizeof(object_set_bindings)/sizeof(VkDescriptorSetLayoutBinding),
+    .object_pcr_mapping = {
+      .mapping_type = MAPPING_POSITION_TO_MATRIX,
+      .index = ATTRIBUTE_ID_POSITION,
+    },
   };
 
-  Map object_descriptor_mappings = map_create(8, 2);
+  Map object_descriptor_mappings = {0};
-  if(object_descriptor_mappings.buckets == 0) {
+  return create_material(device, extent, render_pass, 2, shader_stages, scene_ubo_layout, scene_pcr_size, simple_layout, simple_mesh_type, max_frames_in_flight, object_descriptor_mappings);
-    Material tmp = {};
-    return tmp;
-  }
-
-  Mapping* position_mapping = malloc(sizeof(Mapping));
-  if(position_mapping == 0) {
-    map_destroy(object_descriptor_mappings);
-    Material tmp = {};
-    return tmp;
-  }
-  position_mapping->mapping_type = MAPPING_POSITION_TO_MATRIX;
-  position_mapping->index = 0;
-
-  bool map_result = map_add(&object_descriptor_mappings, ATTRIBUTE_ID_POSITION, position_mapping);
-  if(map_result != true) {
-    map_destroy(object_descriptor_mappings);
-    free(position_mapping);
-    Material tmp = {};
-    return tmp;
 }
 
-  return create_material(device, extent, render_pass, 2, shader_stages, scene_ubo_layout, scene_pcr, simple_layout, simple_mesh_type, max_frames_in_flight, object_descriptor_mappings);
+Material create_texture_mesh_material(VkDevice device, VkExtent2D extent, VkRenderPass render_pass, VkDescriptorSetLayout scene_ubo_layout, uint32_t scene_pcr_size, uint32_t max_frames_in_flight) {
-}
-
-Material create_texture_mesh_material(VkDevice device, VkExtent2D extent, VkRenderPass render_pass, VkDescriptorSetLayout scene_ubo_layout, VkPushConstantRange scene_pcr, uint32_t max_frames_in_flight) {
   VkShaderModule vert_shader = load_shader_file("shader_src/texture.vert.spv", device);
-  if(vert_shader == VK_NULL_HANDLE) {
-    Material tmp = {};
-    return tmp;
-  }
   VkShaderModule frag_shader = load_shader_file("shader_src/texture.frag.spv", device);
-  if(frag_shader == VK_NULL_HANDLE) {
-    Material tmp = {};
-    return tmp;
-  }
   VkPipelineShaderStageCreateInfo shader_stages[2] = {
     {
       .sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
@@ -2065,13 +2082,6 @@ Material create_texture_mesh_material(VkDevice device, VkExtent2D extent, VkRend
       .pImmutableSamplers = 0,
       .stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT,
     },
-    {
-      .binding = 1,
-      .descriptorCount = 1,
-      .descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
-      .pImmutableSamplers = 0,
-      .stageFlags = VK_SHADER_STAGE_VERTEX_BIT,
-    },
   };
 
   MeshType textured_mesh_type = {
@@ -2084,32 +2094,16 @@ Material create_texture_mesh_material(VkDevice device, VkExtent2D extent, VkRend
   PipelineLayout texture_layout = {
     .object_bindings_count = sizeof(mesh_set_bindings)/sizeof(VkDescriptorSetLayoutBinding),
     .object_bindings = mesh_set_bindings,
-  };
-
-  Map object_descriptor_mappings = map_create(8, 2);
-  if(object_descriptor_mappings.buckets == 0) {
-    Material tmp = {};
-    return tmp;
-  }
-
-  Mapping* position_mapping = malloc(sizeof(Mapping));
-  if(position_mapping == 0) {
-    map_destroy(object_descriptor_mappings);
-    Material tmp = {};
-    return tmp;
-  }
-  position_mapping->mapping_type = MAPPING_POSITION_TO_MATRIX;
-  position_mapping->index = 0;
 
-  bool map_result = map_add(&object_descriptor_mappings, ATTRIBUTE_ID_POSITION, position_mapping);
+    .object_pcr_size = sizeof(struct ObjectPC),
-  if(map_result != true) {
+    .object_pcr_mapping = {
-    map_destroy(object_descriptor_mappings);
+      .mapping_type = MAPPING_POSITION_TO_MATRIX,
-    free(position_mapping);
+      .index = ATTRIBUTE_ID_POSITION,
-    Material tmp = {};
+    },
-    return tmp;
+  };
-  }
 
-  return create_material(device, extent, render_pass, 2, shader_stages, scene_ubo_layout, scene_pcr, texture_layout, textured_mesh_type, max_frames_in_flight, object_descriptor_mappings);
+  Map object_descriptor_mappings = {0};
+  return create_material(device, extent, render_pass, 2, shader_stages, scene_ubo_layout, scene_pcr_size, texture_layout, textured_mesh_type, max_frames_in_flight, object_descriptor_mappings);
 }
 
 VkResult command_copy_to_buffer(VkDevice device, GPUBuffer staging, VkBuffer destination, void* data, VkDeviceSize size, VkDeviceSize offset, VkCommandPool pool, VkQueue queue) {
@@ -2521,11 +2515,7 @@ SceneContext create_scene_context(VkDevice device, VkPhysicalDeviceMemoryPropert
     .descriptors = sets,
     .ubos = ubos,
     .ubo_ptrs = ubo_ptrs,
-    .pcr = {
+    .pcr_size = sizeof(struct ScenePC),
-      .offset = 0,
-      .size = sizeof(struct ScenePC),
-      .stageFlags = VK_SHADER_STAGE_VERTEX_BIT,
-    },
   };
 
   return scene;
@@ -2862,7 +2852,7 @@ Object create_simple_mesh_object(Material* simple_mesh_material, VkPhysicalDevic
     return zero;
   }
 
-  Object object = create_renderable(mesh, simple_mesh_material, 1, sets, max_frames_in_flight);
+  Object object = create_renderable(mesh, simple_mesh_material, 1, sets, sizeof(struct ObjectPC), max_frames_in_flight);
   if(object.attributes.buckets == 0) {
     return zero;
   }
@@ -2883,45 +2873,6 @@ Object create_simple_mesh_object(Material* simple_mesh_material, VkPhysicalDevic
     return zero;
   }
 
-  GPUBuffer* position_buffers = malloc(sizeof(GPUBuffer)*max_frames_in_flight);
-  if(position_buffers == NULL) {
-    return zero;
-  }
-
-  for(uint32_t i = 0; i < max_frames_in_flight; i++) {
-    result = gpu_buffer_malloc(device, transfer_memory, sizeof(struct ModelUBO), VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, &position_buffers[i]);
-    if(result != VK_SUCCESS) {
-      return zero;
-    }
-  }
-
-  MaybeValue maybe_ptrs = map_lookup(object.attributes, ATTRIBUTE_ID_DESCRIPTORS);
-  if(maybe_ptrs.has_value == false) {
-    return zero;
-  }
-
-  void*** ptrs = maybe_ptrs.value;
-  for(uint32_t i = 0; i < max_frames_in_flight; i++) {
-    *ptrs[i] = position_buffers[i].page->ptr + position_buffers[i].memory->offset;
-    VkDescriptorBufferInfo buffer_info = {
-      .buffer = position_buffers[i].handle,
-      .offset = 0,
-      .range = sizeof(struct ModelUBO),
-    };
-
-    VkWriteDescriptorSet write_info = {
-      .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
-      .dstSet = sets[i],
-      .dstBinding = 0,
-      .dstArrayElement = 0,
-      .descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
-      .descriptorCount = 1,
-      .pBufferInfo = &buffer_info,
-    };
-
-    vkUpdateDescriptorSets(device, 1, &write_info, 0, 0);
-  }
-
   return object;
 }
 
@@ -2977,7 +2928,7 @@ Object create_texture_mesh_object(Material* texture_mesh_material, VkPhysicalDev
     return zero;
   }
 
-  Object object = create_renderable(mesh, texture_mesh_material, 1, sets, max_frames_in_flight);
+  Object object = create_renderable(mesh, texture_mesh_material, 1, sets, sizeof(struct ObjectPC), max_frames_in_flight);
   if(object.attributes.buckets == 0) {
     return zero;
   }
@@ -2998,47 +2949,6 @@ Object create_texture_mesh_object(Material* texture_mesh_material, VkPhysicalDev
     return zero;
   }
 
-  GPUBuffer* position_buffers = malloc(sizeof(GPUBuffer)*max_frames_in_flight);
-  if(position_buffers == NULL) {
-    return zero;
-  }
-
-  for(uint32_t i = 0; i < max_frames_in_flight; i++) {
-    result = gpu_buffer_malloc(device, transfer_memory, sizeof(struct ModelUBO), VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, &position_buffers[i]);
-    if(result != VK_SUCCESS) {
-      return zero;
-    }
-  }
-
-  MaybeValue maybe_ptrs = map_lookup(object.attributes, ATTRIBUTE_ID_DESCRIPTORS);
-  if(maybe_ptrs.has_value == false) {
-    return zero;
-  }
-
-  void*** ptrs = maybe_ptrs.value;
-
-  for(uint32_t i = 0; i < max_frames_in_flight; i++) {
-    *ptrs[i] = position_buffers[i].page->ptr + position_buffers[i].memory->offset;
-
-    VkDescriptorBufferInfo buffer_info = {
-      .buffer = position_buffers[i].handle,
-      .offset = 0,
-      .range = sizeof(struct ModelUBO),
-    };
-
-    VkWriteDescriptorSet write_info = {
-      .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
-      .dstSet = sets[i],
-      .dstBinding = 1,
-      .dstArrayElement = 0,
-      .descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
-      .descriptorCount = 1,
-      .pBufferInfo = &buffer_info,
-    };
-
-    vkUpdateDescriptorSets(device, 1, &write_info, 0, 0);
-  }
-
   VkExtent2D texture_size = {
     .width = 10,
     .height = 10,
@@ -3102,7 +3012,7 @@ void main_loop(GLFWwindow* window, VulkanContext* context) {
     return;
   }
 
-  Material simple_mesh_material = create_simple_mesh_material(context->device, context->swapchain_extent, context->render_pass, scene.descriptor_layout, scene.pcr, context->max_frames_in_flight);
+  Material simple_mesh_material = create_simple_mesh_material(context->device, context->swapchain_extent, context->render_pass, scene.descriptor_layout, scene.pcr_size, context->max_frames_in_flight);
   if(simple_mesh_material.pipeline == VK_NULL_HANDLE) {
     fprintf(stderr, "failed to create simple mesh material\n");
     return;
@@ -3135,7 +3045,7 @@ void main_loop(GLFWwindow* window, VulkanContext* context) {
     return;
   }
 
-  Material texture_mesh_material = create_texture_mesh_material(context->device, context->swapchain_extent, context->render_pass, scene.descriptor_layout, scene.pcr, context->max_frames_in_flight);
+  Material texture_mesh_material = create_texture_mesh_material(context->device, context->swapchain_extent, context->render_pass, scene.descriptor_layout, scene.pcr_size, context->max_frames_in_flight);
   if(texture_mesh_material.pipeline == VK_NULL_HANDLE) {
     fprintf(stderr, "failed to create texture mesh material\n");
     return;
@@ -3146,10 +3056,6 @@ void main_loop(GLFWwindow* window, VulkanContext* context) {
       .type = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
       .descriptorCount = context->max_frames_in_flight,
     },
-    {
-      .type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 
-      .descriptorCount = context->max_frames_in_flight,
-    },
   };
 
   VkDescriptorPoolCreateInfo texture_pool_info = {