Vertex buffers.

shaders/shader.vert

@@ -1,20 +1,11 @@
 #version 450
 
-layout(location = 0) out vec3 fragColor;
-
-vec2 positions[3] = vec2[](
-    vec2(0.0, -0.5),
-    vec2(0.5, 0.5),
-    vec2(-0.5, 0.5)
-);
+layout(location = 0) in vec2 inPosition;
+layout(location = 1) in vec3 inColor;
 
-vec3 colors[3] = vec3[](
-    vec3(1.0, 0.0, 0.0),
-    vec3(0.0, 1.0, 0.0),
-    vec3(0.0, 0.0, 1.0)
-);
+layout(location = 0) out vec3 fragColor;
 
 void main() {
-    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
-    fragColor = colors[gl_VertexIndex];
+    gl_Position = vec4(inPosition, 0.0, 1.0);
+    fragColor = inColor;
 }

src/VulkanTutorial.cpp

@@ -17,6 +17,39 @@ PFN_vkCreateDebugUtilsMessengerEXT vkeCreateDebugUtilsMessengerEXT = nullptr;
 PFN_vkDestroyDebugUtilsMessengerEXT vkeDestroyDebugUtilsMessengerEXT = nullptr;
 
 
+VkVertexInputBindingDescription Vertex::binding_description() {
+    return {
+        .binding = 0,
+        .stride = sizeof(Vertex),
+        .inputRate = VK_VERTEX_INPUT_RATE_VERTEX,
+    };
+}
+
+std::array<VkVertexInputAttributeDescription, 2> Vertex::attributes_description() {
+    return {
+        VkVertexInputAttributeDescription {
+            .location = 0,
+            .binding = 0,
+            .format = VK_FORMAT_R32G32_SFLOAT,
+            .offset = offsetof(Vertex, position),
+        },
+        {
+            .location = 1,
+            .binding = 0,
+            .format = VK_FORMAT_R32G32B32_SFLOAT,
+            .offset = offsetof(Vertex, color),
+        },
+    };
+}
+
+
+const std::vector<Vertex> vertices = {
+    {{0.0f, -0.5f}, {1.0f, 0.0f, 0.0f}},
+    {{0.5f, 0.5f}, {0.0f, 1.0f, 0.0f}},
+    {{-0.5f, 0.5f}, {0.0f, 0.0f, 1.0f}}
+};
+
+
 VulkanTutorial::VulkanTutorial() {
 }
 
@@ -36,6 +69,7 @@ void VulkanTutorial::initialize(SDL_Window* window) {
     create_graphic_pipeline();
     create_framebuffers();
     create_command_pool();
+    create_vertex_buffer();
     create_command_buffers();
     create_sync_objects();
 }
@@ -64,6 +98,16 @@ void VulkanTutorial::shutdown() {
         m_command_pool = VK_NULL_HANDLE;
     }
 
+    if(m_vertex_buffer != VK_NULL_HANDLE) {
+        vkDestroyBuffer(m_device, m_vertex_buffer, nullptr);
+        m_vertex_buffer = VK_NULL_HANDLE;
+    }
+
+    if(m_vertex_buffer_memory != VK_NULL_HANDLE) {
+        vkFreeMemory(m_device, m_vertex_buffer_memory, nullptr);
+        m_vertex_buffer_memory = VK_NULL_HANDLE;
+    }
+
     cleanup_swap_chain();
 
     if(m_device) {
@@ -600,12 +644,17 @@ void VulkanTutorial::create_graphic_pipeline() {
         },
     };
 
+    const VkVertexInputBindingDescription vertex_bindings[] = {
+        Vertex::binding_description(),
+    };
+    const auto vertex_attributes = Vertex::attributes_description();
+
     VkPipelineVertexInputStateCreateInfo vertex_info {
         .sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO,
-        .vertexBindingDescriptionCount = 0,
-        .pVertexBindingDescriptions = nullptr,
-        .vertexAttributeDescriptionCount = 0,
-        .pVertexAttributeDescriptions = nullptr,
+        .vertexBindingDescriptionCount = 1,
+        .pVertexBindingDescriptions = vertex_bindings,
+        .vertexAttributeDescriptionCount = uint32_t(vertex_attributes.size()),
+        .pVertexAttributeDescriptions = vertex_attributes.data(),
     };
 
     VkPipelineInputAssemblyStateCreateInfo assembly_info {
@@ -748,6 +797,42 @@ void VulkanTutorial::create_command_pool() {
         throw std::runtime_error("failed to create command pool");
 }
 
+void VulkanTutorial::create_vertex_buffer() {
+    VkBufferCreateInfo buffer_info {
+        .sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
+        .size = sizeof(vertices[0]) * vertices.size(),
+        .usage = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT,
+        .sharingMode = VK_SHARING_MODE_EXCLUSIVE,
+    };
+
+    if(vkCreateBuffer(m_device, &buffer_info, nullptr, &m_vertex_buffer) != VK_SUCCESS)
+        throw std::runtime_error("failed to create vertex buffer");
+
+    VkMemoryRequirements memory_requirements;
+    vkGetBufferMemoryRequirements(m_device, m_vertex_buffer, &memory_requirements);
+
+    const auto memory_type = find_memory(memory_requirements.memoryTypeBits,
+        VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
+    if(memory_type < 0)
+        throw std::runtime_error("failed to find suitable memory type for vertex buffer");
+
+    VkMemoryAllocateInfo alloc_info {
+        .sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
+        .allocationSize = memory_requirements.size,
+        .memoryTypeIndex = uint32_t(memory_type),
+    };
+
+    if(vkAllocateMemory(m_device, &alloc_info, nullptr, &m_vertex_buffer_memory) != VK_SUCCESS)
+        throw std::runtime_error("failed to allocate vertex buffer memory");
+
+    vkBindBufferMemory(m_device, m_vertex_buffer, m_vertex_buffer_memory, 0);
+
+    void* buffer = nullptr;
+    vkMapMemory(m_device, m_vertex_buffer_memory, 0, buffer_info.size, 0, &buffer);
+    memcpy(buffer, vertices.data(), size_t(buffer_info.size));
+    vkUnmapMemory(m_device, m_vertex_buffer_memory);
+}
+
 void VulkanTutorial::create_command_buffers() {
     m_command_buffers.resize(m_framebuffers.size());
 
@@ -794,8 +879,19 @@ void VulkanTutorial::create_command_buffers() {
         };
 
         vkCmdBeginRenderPass(command_buffer, &pass_info, VK_SUBPASS_CONTENTS_INLINE);
+
         vkCmdBindPipeline(command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, m_pipeline);
-        vkCmdDraw(command_buffer, 3, 1, 0, 0);
+
+        VkBuffer vertex_buffers[] = {
+            m_vertex_buffer,
+        };
+        VkDeviceSize offsets[] = {
+            0,
+        };
+        vkCmdBindVertexBuffers(command_buffer, 0, 1, vertex_buffers, offsets);
+
+        vkCmdDraw(command_buffer, uint32_t(vertices.size()), 1, 0, 0);
+
         vkCmdEndRenderPass(command_buffer);
 
         if(vkEndCommandBuffer(command_buffer) != VK_SUCCESS)
@@ -902,6 +998,19 @@ VkShaderModule VulkanTutorial::create_shader_module_from_file(const char* path)
     return VK_NULL_HANDLE;
 }
 
+int32_t VulkanTutorial::find_memory(uint32_t type_filter, VkMemoryPropertyFlags properties) {
+    VkPhysicalDeviceMemoryProperties memory_properties;
+    vkGetPhysicalDeviceMemoryProperties(m_physical_device, &memory_properties);
+
+    for(uint32_t type_index = 0; type_index < memory_properties.memoryTypeCount; type_index += 1) {
+        if(((1 << type_index) & type_filter) &&
+            (memory_properties.memoryTypes[type_index].propertyFlags & properties) == properties)
+            return type_index;
+    }
+
+    return -1;
+}
+
 std::vector<VkPhysicalDevice> VulkanTutorial::get_physical_devices() const {
     uint32_t devices_count = 0;
     vkEnumeratePhysicalDevices(m_instance, &devices_count, nullptr);

src/VulkanTutorial.h

@@ -2,6 +2,7 @@
 
 #include <SDL2/SDL.h>
 #include <vulkan/vulkan.h>
+#include <Eigen/Dense>
 #include <vector>
 
 
@@ -15,6 +16,15 @@ extern PFN_vkCreateDebugUtilsMessengerEXT vkeCreateDebugUtilsMessengerEXT;
 extern PFN_vkDestroyDebugUtilsMessengerEXT vkeDestroyDebugUtilsMessengerEXT;
 
 
+struct Vertex {
+    Eigen::Vector2f position;
+    Eigen::Vector3f color;
+
+    static VkVertexInputBindingDescription binding_description();
+    static std::array<VkVertexInputAttributeDescription, 2> attributes_description();
+};
+
+
 class VulkanTutorial {
 public:
     VulkanTutorial();
@@ -49,6 +59,7 @@ private:
     void create_graphic_pipeline();
     void create_framebuffers();
     void create_command_pool();
+    void create_vertex_buffer();
     void create_command_buffers();
     void create_sync_objects();
 
@@ -58,6 +69,8 @@ private:
     VkShaderModule create_shader_module(const std::vector<char> bytecode);
     VkShaderModule create_shader_module_from_file(const char* path);
 
+    int32_t find_memory(uint32_t type_filter, VkMemoryPropertyFlags properties);
+
     std::vector<VkPhysicalDevice> get_physical_devices() const;
     std::vector<VkQueueFamilyProperties> get_queue_families(VkPhysicalDevice physical_device) const;
     std::vector<VkExtensionProperties> get_device_extensions(VkPhysicalDevice physical_device) const;
@@ -84,6 +97,8 @@ private:
     VkPipeline m_pipeline = VK_NULL_HANDLE;
     std::vector<VkFramebuffer> m_framebuffers;
     VkCommandPool m_command_pool = VK_NULL_HANDLE;
+    VkBuffer m_vertex_buffer = VK_NULL_HANDLE;
+    VkDeviceMemory m_vertex_buffer_memory = VK_NULL_HANDLE;
     std::vector<VkCommandBuffer> m_command_buffers;
     std::vector<VkSemaphore> m_image_available_semaphores;
     std::vector<VkSemaphore> m_render_finished_semaphores;