Use index buffer.

src/Vulkan/Context.cpp

@@ -338,6 +338,60 @@ std::tuple<VkBuffer, VkDeviceMemory> Context::create_buffer(VkDeviceSize size, V
     return { buffer, memory };
 }
 
+std::tuple<VkBuffer, VkDeviceMemory> Context::create_buffer(
+    VkDeviceSize size, char* data,
+    VkBufferUsageFlags usage,
+    VkMemoryPropertyFlags memory_properties,
+    uint32_t dst_queue_family
+) {
+    VkBuffer tmp_buffer = VK_NULL_HANDLE;
+    VkDeviceMemory tmp_buffer_memory = VK_NULL_HANDLE;
+    std::tie(tmp_buffer, tmp_buffer_memory) = create_buffer(
+        size,
+        VK_BUFFER_USAGE_TRANSFER_SRC_BIT,
+        VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT
+        | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT
+    );
+    auto const tmp_buffer_guard = make_guard([&] {
+        free_memory(tmp_buffer_memory);
+        destroy_buffer(tmp_buffer);
+    });
+
+    VkBuffer buffer = VK_NULL_HANDLE;
+    VkDeviceMemory buffer_memory = VK_NULL_HANDLE;
+    std::tie(buffer, buffer_memory) = create_buffer(
+        size,
+        usage | VK_BUFFER_USAGE_TRANSFER_DST_BIT,
+        memory_properties
+    );
+
+    void* device_buffer = nullptr;
+    vkMapMemory(
+        m_device,
+        tmp_buffer_memory,
+        0,
+        size,
+        0,
+        &device_buffer
+    );
+
+    memcpy(device_buffer, data, size_t(size));
+
+    vkUnmapMemory(
+        m_device,
+        tmp_buffer_memory
+    );
+
+    copy_buffer(
+        buffer,
+        tmp_buffer,
+        dst_queue_family,
+        size
+    );
+
+    return std::make_tuple(buffer, buffer_memory);
+}
+
 void Context::copy_buffer(VkBuffer dst, VkBuffer src, uint32_t dst_queue_family, VkDeviceSize size) {
     VkCommandBufferAllocateInfo alloc_info {
         .sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO,
@@ -387,6 +441,8 @@ void Context::copy_buffer(VkBuffer dst, VkBuffer src, uint32_t dst_queue_family,
 
     vkEndCommandBuffer(command_buffer);
 
+    vkResetFences(m_device, 1, &m_transfer_fence);
+
     VkSubmitInfo submit_info {
         .sType = VK_STRUCTURE_TYPE_SUBMIT_INFO,
         .commandBufferCount = 1,
@@ -853,6 +909,7 @@ VKAPI_ATTR VkBool32 VKAPI_CALL Context::log_debug_message(
         const VkDebugUtilsMessengerCallbackDataEXT* data,
         void* user_data
 ) {
+    {
         auto stream = [severity]() {
             switch(severity) {
             case VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT:
@@ -880,6 +937,7 @@ VKAPI_ATTR VkBool32 VKAPI_CALL Context::log_debug_message(
         }
 
         stream << data->pMessage;
+    }
 
     if(severity == VK_DEBUG_UTILS_MESSAGE_SEVERITY_ERROR_BIT_EXT)
         abort();

src/Vulkan/Context.h

@@ -103,7 +103,15 @@ public:
     int32_t find_memory_type(uint32_t type_filter, VkMemoryPropertyFlags properties);
     VkDeviceMemory allocate_memory(VkDeviceSize size, uint32_t type_filter, VkMemoryPropertyFlags properties);
 
-    std::tuple<VkBuffer, VkDeviceMemory> create_buffer(VkDeviceSize size, VkBufferUsageFlags usage, VkMemoryPropertyFlags memory_properties);
+    std::tuple<VkBuffer, VkDeviceMemory> create_buffer(
+        VkDeviceSize size,
+        VkBufferUsageFlags usage,
+        VkMemoryPropertyFlags memory_properties);
+    std::tuple<VkBuffer, VkDeviceMemory> create_buffer(
+        VkDeviceSize size, char* buffer,
+        VkBufferUsageFlags usage,
+        VkMemoryPropertyFlags memory_properties,
+        uint32_t dst_queue_family);
     void copy_buffer(VkBuffer dst, VkBuffer src, uint32_t dst_queue_family, VkDeviceSize size);
 
 

src/VulkanTutorial.cpp

@@ -40,9 +40,15 @@ std::array<VkVertexInputAttributeDescription, 2> Vertex::attributes_description(
 
 
 const std::vector<Vertex> vertices = {
-    {{0.0f, -0.5f}, {1.0f, 0.0f, 0.0f}},
+    {{-0.5f, -0.5f}, {1.0f, 0.0f, 0.0f}},
-    {{0.5f, 0.5f}, {0.0f, 1.0f, 0.0f}},
+    {{0.5f, -0.5f}, {0.0f, 1.0f, 0.0f}},
-    {{-0.5f, 0.5f}, {0.0f, 0.0f, 1.0f}}
+    {{-0.5f, 0.5f}, {0.0f, 0.0f, 1.0f}},
+    {{0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}},
+};
+
+const std::vector<uint16_t> indices = {
+    0, 1, 2,
+    2, 1, 3,
 };
 
 
@@ -66,12 +72,13 @@ void VulkanTutorial::initialize(SDL_Window* window) {
         .with_window(window);
     m_context.initialize(context_settings);
 
+    create_command_pool();
+    create_vertex_buffer();
+    create_index_buffer();
+
     auto const swapchain_settings = Vulkan::SwapchainSettings(&m_context)
         .with_queue(m_context.queue_family(GRAPHIC_QUEUE));
     m_swapchain.initialize(swapchain_settings);
-
-    create_command_pool();
-    create_vertex_buffer();
 }
 
 void VulkanTutorial::shutdown() {
@@ -84,8 +91,10 @@ void VulkanTutorial::shutdown() {
 
     m_context.free_memory(m_vertex_buffer_memory);
     m_context.destroy_command_pool(m_command_pool);
-    m_context.destroy_buffer(m_vertex_buffer);
+    m_context.free_memory(m_index_buffer_memory);
+    m_context.destroy_buffer(m_index_buffer);
     m_context.free_memory(m_vertex_buffer_memory);
+    m_context.destroy_buffer(m_vertex_buffer);
 
     for(VkSemaphore semaphore: m_render_done)
         m_context.destroy_semaphore(semaphore);
@@ -436,57 +445,29 @@ void VulkanTutorial::create_vertex_buffer() {
     if(m_vertex_buffer != VK_NULL_HANDLE)
         return;
 
-    VkDeviceSize buffer_size = sizeof(vertices[0]) * vertices.size();
+    VkDeviceSize size = sizeof(vertices[0]) * vertices.size();
-
-    VkBuffer tmp_buffer = VK_NULL_HANDLE;
-    VkDeviceMemory tmp_buffer_memory = VK_NULL_HANDLE;
-    std::tie(tmp_buffer, tmp_buffer_memory) = m_context.create_buffer(
-        buffer_size,
-        VK_BUFFER_USAGE_TRANSFER_SRC_BIT,
-        VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT
-        | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT
-    );
-    auto const tmp_buffer_guard = make_guard([&] {
-        m_context.free_memory(tmp_buffer_memory);
-        m_context.destroy_buffer(tmp_buffer);
-    });
-
     std::tie(m_vertex_buffer, m_vertex_buffer_memory) = m_context.create_buffer(
-        buffer_size,
+        size, (char*)vertices.data(),
-        VK_BUFFER_USAGE_VERTEX_BUFFER_BIT
+        VK_BUFFER_USAGE_VERTEX_BUFFER_BIT,
-        | VK_BUFFER_USAGE_TRANSFER_DST_BIT,
+        VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT,
-        VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT
+        m_context.queue_family(GRAPHIC_QUEUE)
     );
+}
 
-    void* buffer = nullptr;
+void VulkanTutorial::create_index_buffer() {
-    vkMapMemory(
+    if(m_index_buffer != VK_NULL_HANDLE)
-        m_context.device(),
+        return;
-        tmp_buffer_memory,
-        0,
-        buffer_size,
-        0,
-        &buffer
-    );
-
-    memcpy(buffer, vertices.data(), size_t(buffer_size));
-
-    vkUnmapMemory(
-        m_context.device(),
-        tmp_buffer_memory
-    );
 
-    m_context.copy_buffer(
+    VkDeviceSize size = sizeof(indices[0]) * indices.size();
-        m_vertex_buffer,
+    std::tie(m_index_buffer, m_index_buffer_memory) = m_context.create_buffer(
-        tmp_buffer,
+        size, (char*)indices.data(),
-        m_context.queue_family(GRAPHIC_QUEUE),
+        VK_BUFFER_USAGE_INDEX_BUFFER_BIT,
-        buffer_size
+        VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT,
+        m_context.queue_family(GRAPHIC_QUEUE)
     );
 }
 
 void VulkanTutorial::create_command_buffers() {
-    create_command_pool();
-    create_vertex_buffer();
-
     m_command_buffers.resize(m_framebuffers.size());
 
     VkCommandBufferAllocateInfo allocate_info {
@@ -564,11 +545,19 @@ void VulkanTutorial::create_command_buffers() {
             offsets
         );
 
-        vkCmdDraw(
+        vkCmdBindIndexBuffer(
+            command_buffer,
+            m_index_buffer,
+            0,
+            VK_INDEX_TYPE_UINT16
+        );
+
+        vkCmdDrawIndexed(
             command_buffer,
-            uint32_t(vertices.size()),
+            uint32_t(indices.size()),
             1,
             0,
+            0,
             0
         );
 

src/VulkanTutorial.h

@@ -46,6 +46,7 @@ private:
     void create_framebuffers();
     void create_command_pool();
     void create_vertex_buffer();
+    void create_index_buffer();
     void create_command_buffers();
 
 private:
@@ -61,6 +62,8 @@ private:
     VkCommandPool m_command_pool = VK_NULL_HANDLE;
     VkBuffer m_vertex_buffer = VK_NULL_HANDLE;
     VkDeviceMemory m_vertex_buffer_memory = VK_NULL_HANDLE;
+    VkBuffer m_index_buffer = VK_NULL_HANDLE;
+    VkDeviceMemory m_index_buffer_memory = VK_NULL_HANDLE;
     std::vector<VkCommandBuffer> m_command_buffers;
     std::vector<VkSemaphore> m_render_done;
 };