Static index buffering

vulkan/vulkan_app.cpp

@@ -703,6 +703,7 @@ namespace vapp{
         allocInfo.allocationSize = memRequirements.size;
         allocInfo.memoryTypeIndex = findMemoryType(memRequirements.memoryTypeBits, properties);
 
+        // TODO: switch vkAllocateMemory with own implementation or GPUOpen's VulkanMemoryAllocator
         if(vkAllocateMemory(device, &allocInfo, nullptr, &bufferMemory) != VK_SUCCESS){
             throw std::runtime_error("Func: createBuffer\nError: Failed to allocate memory for buffer!\n");
         }
@@ -765,6 +766,27 @@ namespace vapp{
         vkFreeMemory(device, stagingBufferMemory, nullptr);
     }
 
+    void Vulkan::createIndexBuffer(){
+        VkDeviceSize bufferSize = sizeof(indices[0]) * indices.size();
+
+        VkBuffer stagingBuffer;
+        VkDeviceMemory stagingBufferMemory;
+
+        createBuffer(bufferSize, VK_BUFFER_USAGE_TRANSFER_SRC_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, stagingBuffer, stagingBufferMemory);
+
+        void *data;
+        vkMapMemory(device, stagingBufferMemory, 0, bufferSize, 0, &data);
+        memcpy(data, indices.data(), (size_t)bufferSize);
+        vkUnmapMemory(device, stagingBufferMemory);
+
+        createBuffer(bufferSize, VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_INDEX_BUFFER_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, indexBuffer, indexBufferMemory);
+
+        copyBuffer(stagingBuffer, indexBuffer, bufferSize);
+
+        vkDestroyBuffer(device, stagingBuffer, nullptr);
+        vkFreeMemory(device, stagingBufferMemory, nullptr);
+    }
+
     void Vulkan::createCommandBuffers(){
         commandBuffers.resize(MAX_FRAMES_IN_FLIGHT);
 
@@ -805,6 +827,8 @@ namespace vapp{
         VkDeviceSize offsets[] = { 0 };
         vkCmdBindVertexBuffers(commandBuffer, 0, 1, vertexBuffers, offsets);
 
+        vkCmdBindIndexBuffer(commandBuffer, indexBuffer, 0, VK_INDEX_TYPE_UINT32);
+
         VkViewport viewport{};
         viewport.x = 0.0f;
         viewport.y = 0.0f;
@@ -819,7 +843,9 @@ namespace vapp{
         scissor.extent = swapChainExtent;
         vkCmdSetScissor(commandBuffer, 0, 1, &scissor);
 
-        vkCmdDraw(commandBuffer, static_cast<uint32_t>(vertices.size()), 1, 0, 0);
+        // vkCmdDraw(commandBuffer, static_cast<uint32_t>(vertices.size()), 1, 0, 0);
+        // -> goto indexed draw
+        vkCmdDrawIndexed(commandBuffer, static_cast<uint32_t>(indices.size()), 1, 0, 0, 0);
 
         vkCmdEndRenderPass(commandBuffer);
         if(vkEndCommandBuffer(commandBuffer) != VK_SUCCESS){
@@ -957,6 +983,7 @@ namespace vapp{
         createFrameBuffers();
         createCommandPool();
         createVertexBuffer();
+        createIndexBuffer();
         createCommandBuffers();
         createSyncObjects();
     }
@@ -974,6 +1001,9 @@ namespace vapp{
         // Vulkan
         cleanupSwapChain();
 
+        vkDestroyBuffer(device, indexBuffer, nullptr);
+        vkFreeMemory(device, indexBufferMemory, nullptr);
+
         vkDestroyBuffer(device, vertexBuffer, nullptr);
         vkFreeMemory(device, vertexBufferMemory, nullptr);
 

vulkan/vulkan_app.hpp

@@ -57,11 +57,16 @@ namespace vapp{
 
     // TODO: Remove
     const std::vector<Vertex> vertices = {
-        {{0.0f, -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, 1.0f, 0.0f}},
 {{-0.5f, 0.5f}, {0.0f, 0.0f, 1.0f}}
     };
 
+    // uint16_t also possible -> change in vkCmdBindIndexBuffer also
+    const std::vector<uint32_t> indices = { 0, 1, 2, 2, 3, 0 };
+    // END Remove
+
     struct QueueFamilyIndices{
         std::optional<uint32_t> graphicsFamily;
         std::optional<uint32_t> presentFamily;
@@ -123,6 +128,8 @@ namespace vapp{
 
         VkBuffer vertexBuffer;
         VkDeviceMemory vertexBufferMemory;
+        VkBuffer indexBuffer;
+        VkDeviceMemory indexBufferMemory;
 #pragma endregion
 
         bool checkValidationLayerSupport();
@@ -151,6 +158,7 @@ namespace vapp{
         void createBuffer(VkDeviceSize size, VkBufferUsageFlags usage, VkMemoryPropertyFlags properties, VkBuffer &buffer, VkDeviceMemory &bufferMemory);
         void copyBuffer(VkBuffer srcBuffer, VkBuffer dstBuffer, VkDeviceSize size);
         void createVertexBuffer();
+        void createIndexBuffer();
         void createCommandBuffers();
         void recordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t imageIndex);
         void createSyncObjects();