完成indexBuffer

VulkanTutorial.cpp

@@ -122,6 +122,7 @@ void HelloTriangleApplication::initVulkan() {
 	createCommandPool();
 
 	createVertexBuffer();
+	createIndexBuffer();
 
 	createCommandBuffer();
 
@@ -151,6 +152,8 @@ void HelloTriangleApplication::cleanup(GLFWwindow* window) {
 
 	cleanupSwapChain();
 
+	vkDestroyBuffer(device, indexBuffer, nullptr);
+	vkFreeMemory(device, indexBufferMemory, nullptr);
 	vkDestroyBuffer(device, vertexBuffer, nullptr);
 	vkFreeMemory(device, vertexBufferMemory, nullptr);
 
@@ -735,6 +738,28 @@ void HelloTriangleApplication::createVertexBuffer()
 
 }
 
+void HelloTriangleApplication::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);
+
+	// host visible buffer as temp buffer
+	createBuffer(bufferSize, VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_INDEX_BUFFER_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, indexBuffer, indexBufferMemory);
+
+	// move the vertex data to the device local buffer
+	copyBuffer(stagingBuffer, indexBuffer, bufferSize);
+
+	vkDestroyBuffer(device, stagingBuffer, nullptr);
+	vkFreeMemory(device, stagingBufferMemory, nullptr);
+}
+
 void HelloTriangleApplication::createBuffer(VkDeviceSize size, VkBufferUsageFlags usage, VkMemoryPropertyFlags properties, VkBuffer& buffer, VkDeviceMemory& bufferMemory)
 {
 	VkBufferCreateInfo bufferInfo{};
@@ -879,8 +904,10 @@ void HelloTriangleApplication::recordCommandBuffer(VkCommandBuffer commandBuffer
 	VkBuffer vertexBuffers[] = { vertexBuffer };
 	VkDeviceSize offsets[] = { 0 };
 	vkCmdBindVertexBuffers(commandBuffer, 0, 1, vertexBuffers, offsets);
-
-	vkCmdDraw(commandBuffer, 3, 1, 0, 0);
+	// bind indexBuffer
+	vkCmdBindIndexBuffer(commandBuffer, indexBuffer, 0, VK_INDEX_TYPE_UINT16);
+	
+	vkCmdDrawIndexed(commandBuffer, static_cast<uint32_t>(indices.size()), 1, 0, 0, 0);
 
 	vkCmdEndRenderPass(commandBuffer);
 

VulkanTutorial.h

@@ -112,13 +112,20 @@ private:
 	};
 
 	const std::vector<Vertex> vertices = {
-	{{0.0f, -0.5f}, {1.0f, 1.0f, 1.0f}},
-	{{0.5f, 0.5f}, {0.0f, 1.0f, 0.0f}},
-	{{-0.5f, 0.5f}, {0.0f, 0.0f, 1.0f}}
+	{{-0.5f, -0.5f}, {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}},
+	{{-0.5f,0.5f}, {1.0f,1.0f,1.0f}}
+	};
+
+	const std::vector<uint16_t> indices = {
+		0,1,2,2,3,0
 	};
 
 	VkBuffer vertexBuffer;
 	VkDeviceMemory vertexBufferMemory;
+	VkBuffer indexBuffer;
+	VkDeviceMemory indexBufferMemory;
 
 	void initWindow(int Width, int Height);
 
@@ -179,6 +186,7 @@ private:
 	void createCommandPool();
 
 	void createVertexBuffer();
+	void createIndexBuffer();
 	void createBuffer(VkDeviceSize size,VkBufferUsageFlags usage,VkMemoryPropertyFlags properties,VkBuffer& buffer,VkDeviceMemory& bufferMemory);
 
 	void copyBuffer(VkBuffer srcBuffer, VkBuffer dstBuffer, VkDeviceSize size);