Add UBOs.

src/main.c

@@ -7,6 +7,10 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <cglm/cglm.h>
+#include <cglm/affine.h>
+#include <cglm/cam.h>
+#include <time.h>
+#include <cglm/util.h>
 
 #define WIDTH  2560
 #define HEIGHT 1440
@@ -56,6 +60,8 @@ typedef struct ApplicationState {
     //describes how to access an image and allows access to it
     VkImageView* swapchain_image_views;
     VkRenderPass render_pass;
+
+    VkDescriptorSetLayout descriptor_set_layout;
     VkPipelineLayout pipeline_layout;
 
     VkPipeline graphics_pipeline;
@@ -76,6 +82,12 @@ typedef struct ApplicationState {
 
     VkBuffer index_buffer;
     VkDeviceMemory index_buffer_memory;
+
+    VkBuffer uniform_buffers[MAX_FRAMES_IN_FLIGHT];
+    VkDeviceMemory uniform_buffer_memory[MAX_FRAMES_IN_FLIGHT];
+
+    VkDescriptorPool descriptor_pool;
+    VkDescriptorSet descriptor_sets[2];
 } ApplicationState;
 
 typedef struct QueueFamilyIndices {
@@ -101,6 +113,12 @@ const uint16_t indices[] = {
     0, 1, 2, 2, 3, 0
 };
 
+typedef struct UBO {
+    mat4 model;
+    mat4 view;
+    mat4 proj;
+} UBO;
+
 void create_window(ApplicationState* state) {
     glfwInit();
 
@@ -656,13 +674,33 @@ void create_render_pass(ApplicationState* state) {
     render_pass_info.pDependencies = &dependency;
 
     if (vkCreateRenderPass(state->device, &render_pass_info, NULL, &state->render_pass) != VK_SUCCESS) {
-        printf("failed to create render pass");
+        printf("failed to create render pass\n");
         exit(1);
     }
 
     printf("created render pass\n");
 }
 
+//Descriptor set layouts specify the types of resources that are going to be accessed by the pipeline
+void create_descriptor_set_layout(ApplicationState* state) {
+    VkDescriptorSetLayoutBinding ubo_layout_binding = {0};
+    ubo_layout_binding.binding = 0;
+    ubo_layout_binding.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+    ubo_layout_binding.descriptorCount = 1;
+    ubo_layout_binding.stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
+
+    VkDescriptorSetLayoutCreateInfo layout_info = {0};
+    layout_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO;
+    layout_info.bindingCount = 1;
+    layout_info.pBindings = &ubo_layout_binding;
+
+    if (vkCreateDescriptorSetLayout(state->device, &layout_info, NULL, &state->descriptor_set_layout)) {
+        printf("could not create descriptor set layout\n");
+        exit(1);
+    }
+    printf("created descriptor set layout\n");
+}
+
 //now we need to setup a graphics pipeline
 //the usual stages of a pipeline are:
 //
@@ -815,8 +853,8 @@ void create_graphics_pipeline(ApplicationState* state) {
     //used for things such as uniforms
     VkPipelineLayoutCreateInfo pipeline_layout_create_info = {0};
     pipeline_layout_create_info.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
-    pipeline_layout_create_info.setLayoutCount = 0;
-    pipeline_layout_create_info.pSetLayouts = NULL;
+    pipeline_layout_create_info.setLayoutCount = 1;
+    pipeline_layout_create_info.pSetLayouts = &state->descriptor_set_layout;
     pipeline_layout_create_info.pushConstantRangeCount = 0;
     pipeline_layout_create_info.pPushConstantRanges = NULL;
 
@@ -1030,6 +1068,72 @@ void create_index_buffer(ApplicationState* state) {
     vkFreeMemory(state->device, staging_buffer_memory, NULL);
 }
 
+void create_uniform_buffers(ApplicationState* state) {
+    VkDeviceSize buffer_size = sizeof(UBO);
+
+    for (int i = 0; i < MAX_FRAMES_IN_FLIGHT; i++) {
+        create_buffer(state, buffer_size, VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,
+                &state->uniform_buffers[i], &state->uniform_buffer_memory[i]);
+    }
+}
+
+void create_descriptor_pool(ApplicationState* state) {
+    VkDescriptorPoolSize pool_size = {0};
+    pool_size.type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+    pool_size.descriptorCount = MAX_FRAMES_IN_FLIGHT;
+
+    VkDescriptorPoolCreateInfo pool_info = {0};
+    pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
+    pool_info.poolSizeCount = 1;
+    pool_info.pPoolSizes = &pool_size;
+    pool_info.maxSets = MAX_FRAMES_IN_FLIGHT;
+
+    if (vkCreateDescriptorPool(state->device, &pool_info, NULL, &state->descriptor_pool) != VK_SUCCESS) {
+        printf("failed to create descriptor pool\n");
+        exit(1);
+    }
+
+    printf("created descriptor pool\n");
+}
+
+void create_descriptor_sets(ApplicationState* state) {
+    VkDescriptorSetLayout layouts[2] = {state->descriptor_set_layout, state->descriptor_set_layout};
+    VkDescriptorSetAllocateInfo alloc_info = {0};
+    alloc_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
+    alloc_info.descriptorPool = state->descriptor_pool;
+    alloc_info.descriptorSetCount = MAX_FRAMES_IN_FLIGHT;
+    alloc_info.pSetLayouts = layouts;
+
+    if (vkAllocateDescriptorSets(state->device, &alloc_info, state->descriptor_sets) != VK_SUCCESS) {
+        printf("failed to allocate descriptor sets\n");
+        exit(1);
+    }
+
+    printf("allocated descriptor sets\n");
+
+    for (int i = 0; i < MAX_FRAMES_IN_FLIGHT; i++) {
+        VkDescriptorBufferInfo buffer_info = {0};
+        buffer_info.buffer = state->uniform_buffers[i];
+        buffer_info.offset = 0;
+        buffer_info.range = sizeof(UBO);
+
+        VkWriteDescriptorSet descriptor_write = {0};
+        descriptor_write.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+        descriptor_write.dstSet = state->descriptor_sets[i];
+        descriptor_write.dstBinding = 0;
+        descriptor_write.dstArrayElement = 0;
+        descriptor_write.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+        descriptor_write.descriptorCount = 1;
+        descriptor_write.pBufferInfo = &buffer_info;
+        descriptor_write.pImageInfo = NULL;
+        descriptor_write.pTexelBufferView = NULL;
+
+        vkUpdateDescriptorSets(state->device, 1, &descriptor_write, 0, NULL);
+    }
+    
+    printf("created descriptor sets\n");
+}
+
 void create_command_buffer(ApplicationState* state) {
     VkCommandBufferAllocateInfo command_buf_allocate_info = {0};
     command_buf_allocate_info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
@@ -1046,7 +1150,7 @@ void create_command_buffer(ApplicationState* state) {
     printf("created command buffer\n");
 }
 
-void record_command_buffer(ApplicationState* state, VkCommandBuffer command_buffer, uint32_t image_index) {
+void record_command_buffer(ApplicationState* state, VkCommandBuffer command_buffer, uint32_t image_index, uint32_t current_frame) {
     VkCommandBufferBeginInfo begin_info = {0};
     begin_info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
     begin_info.flags = 0;
@@ -1100,6 +1204,8 @@ void record_command_buffer(ApplicationState* state, VkCommandBuffer command_buff
     scissor.extent = state->swapchain_extent;
     vkCmdSetScissor(command_buffer, 0, 1, &scissor);
 
+    vkCmdBindDescriptorSets(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, state->pipeline_layout, 0, 1, &state->descriptor_sets[current_frame], 0, NULL);
+
     //vertex count, instance count, first vertex and first instance
     vkCmdDrawIndexed(command_buffer, ARRSIZE(indices), 1, 0, 0, 0);
 
@@ -1140,15 +1246,45 @@ void init_vulkan(ApplicationState* state) {
     create_swap_chain(state);
     create_image_views(state);
     create_render_pass(state);
+    create_descriptor_set_layout(state);
     create_graphics_pipeline(state);
     create_framebuffers(state);
     create_command_pool(state);
     create_vertex_buffer(state);
     create_index_buffer(state);
+    create_uniform_buffers(state);
+    create_descriptor_pool(state);
+    printf("creating descriptor sets\n");
+    create_descriptor_sets(state);
     create_command_buffer(state);
     create_sync_objects(state);
 }
 
+void update_uniform_buffer(ApplicationState* state, uint32_t current_frame) {
+    uint64_t time = clock() / (CLOCKS_PER_SEC / 1000);
+
+    UBO ubo = {0};
+    glm_mat4_identity(ubo.model);
+    glm_mat4_identity(ubo.view);
+    glm_mat4_identity(ubo.proj);
+
+    glm_mat4_identity(ubo.model);
+    vec3 axis = {0.0f, 1.0f, 1.0f};
+    glm_rotate(ubo.model, time * glm_rad(90.0f), axis);
+
+    vec3 eye = {2.0f, 2.0f, 2.0f};
+    vec3 center = {0.0f, 0.0f, 0.0f};
+    vec3 up = {0.0f, 0.0f, 1.0f};
+    glm_lookat(eye, center, up, ubo.view);
+
+    glm_perspective(glm_rad(45.0f), state->swapchain_extent.width / (float)state->swapchain_extent.height, 0.1f, 10.f, ubo.proj);
+
+    void* data;
+    vkMapMemory(state->device, state->uniform_buffer_memory[current_frame], 0, sizeof(UBO), 0, &data);
+    memcpy(data, &ubo, sizeof(UBO));
+    vkUnmapMemory(state->device, state->uniform_buffer_memory[current_frame]);
+}
+
 void draw_frame(ApplicationState* state, uint32_t current_frame) {
     //wait for the previous frame to be rendered
     vkWaitForFences(state->device, 1, &state->in_flight_frames[current_frame], VK_TRUE, UINT64_MAX);
@@ -1158,9 +1294,11 @@ void draw_frame(ApplicationState* state, uint32_t current_frame) {
     //get images from the swapchain and signal when the image is ready
     vkAcquireNextImageKHR(state->device, state->swapchain, UINT64_MAX, state->image_available_semaph[current_frame], VK_NULL_HANDLE, &image_index);
 
+    update_uniform_buffer(state, current_frame);
+
     //reset and setup the commands we want to run
     vkResetCommandBuffer(state->command_buffer[current_frame], 0);
-    record_command_buffer(state, state->command_buffer[current_frame], image_index);
+    record_command_buffer(state, state->command_buffer[current_frame], image_index, current_frame);
 
     //specify what to wait for before execution can begin
     VkSubmitInfo submit_info = {0};
@@ -1214,6 +1352,9 @@ void terminate(ApplicationState* state) {
         vkDestroyFence(state->device, state->in_flight_frames[i], NULL);
         vkDestroySemaphore(state->device, state->image_available_semaph[i], NULL);
         vkDestroySemaphore(state->device, state->render_finished_sempah[i], NULL);
+    
+        vkDestroyBuffer(state->device, state->uniform_buffers[i], NULL);
+        vkFreeMemory(state->device, state->uniform_buffer_memory[i], NULL);
     }
     vkDestroyCommandPool(state->device, state->commandPool, NULL);
     for (int i = 0; i < state->swapchain_image_count; i++) {
@@ -1222,6 +1363,8 @@ void terminate(ApplicationState* state) {
     vkDestroyPipeline(state->device, state->graphics_pipeline, NULL);
     vkDestroyRenderPass(state->device, state->render_pass, NULL);
     vkDestroyPipelineLayout(state->device, state->pipeline_layout, NULL);
+    vkDestroyDescriptorPool(state->device, state->descriptor_pool, NULL);
+    vkDestroyDescriptorSetLayout(state->device, state->descriptor_set_layout, NULL);
     for (int i = 0; i < state->swapchain_image_count; i++) {
         vkDestroyImageView(state->device, state->swapchain_image_views[i], NULL);
     }

src/vertex_simple.vert

@@ -1,11 +1,17 @@
 #version 450
 
-layout (location = 0) in vec2 inPosition;
-layout (location = 1) in vec3 inColor;
+layout(binding = 0) uniform UBO {
+    mat4 model;
+    mat4 view;
+    mat4 proj;
+} ubo;
+
+layout(location = 0) in vec2 inPosition;
+layout(location = 1) in vec3 inColor;
 
 layout(location = 0) out vec3 fragColor;
 
 void main() {
-    gl_Position = vec4(inPosition, 0.0, 1.0);
+    gl_Position = ubo.proj * ubo.view * ubo.model * vec4(inPosition, 0.0, 1.0);
     fragColor = inColor;
 }