//22_descriptor_layout.cpp
#define GLFW_INCLUDE_VULKAN
#define GLM_FORCE_RADIANS
#include <GLFW/glfw3.h>
#include <fstream>
#include <iostream>
#include <stdexcept>
#include <vector>
#include <cstring>
#include <cstdlib>
#include <optional>
#include <set>
#include <array>
#include <algorithm>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <chrono>

const int WIDTH = 800;
const int HEIGHT = 600;
const int MAX_FRAMES_IN_FLIGHT = 2;

const std::vector<const char*> validationLayers = {
	"VK_LAYER_KHRONOS_validation"
};

const std::vector<const char*> deviceExtensions = {
	VK_KHR_SWAPCHAIN_EXTENSION_NAME
};

#ifdef NDEBUG
const bool enableValidationLayers = false;
#else
const bool enableValidationLayers = true;
#endif

VkResult CreateDebugUtilsMessengerEXT(VkInstance instance, const VkDebugUtilsMessengerCreateInfoEXT* pCreateInfo, const VkAllocationCallbacks* pAllocator, VkDebugUtilsMessengerEXT* pDebugMessenger) {
	auto func = (PFN_vkCreateDebugUtilsMessengerEXT)vkGetInstanceProcAddr(instance, "vkCreateDebugUtilsMessengerEXT");
	if (func != nullptr) {
		return func(instance, pCreateInfo, pAllocator, pDebugMessenger);
	}
	else {
		return VK_ERROR_EXTENSION_NOT_PRESENT;
	}
}

void DestroyDebugUtilsMessengerEXT(VkInstance instance, VkDebugUtilsMessengerEXT debugMessenger, const VkAllocationCallbacks* pAllocator) {
	auto func = (PFN_vkDestroyDebugUtilsMessengerEXT)vkGetInstanceProcAddr(instance, "vkDestroyDebugUtilsMessengerEXT");
	if (func != nullptr) {
		func(instance, debugMessenger, pAllocator);
	}
}

struct QueueFamilyIndices {
	uint32_t graphicsFamily = -1;
	uint32_t presentFamily = -1;

	bool isComplete() {
		return graphicsFamily >= 0 && presentFamily >= 0;
	}
};

struct SwapChainSupportDetails {
	VkSurfaceCapabilitiesKHR capabilities;
	std::vector<VkSurfaceFormatKHR> formats;
	std::vector<VkPresentModeKHR> presentModes;
};

struct Vertex {
	glm::vec2 pos;
	glm::vec3 color;

	//绑定描述
	static VkVertexInputBindingDescription getBindingDescription() {
		VkVertexInputBindingDescription bindingDescription = {};
		bindingDescription.binding = 0;
		bindingDescription.stride = sizeof(Vertex);
		bindingDescription.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;

		return bindingDescription;
	}

	//属性描述
	static std::array<VkVertexInputAttributeDescription, 2> getAttributeDescriptions() {
		std::array<VkVertexInputAttributeDescription, 2> attributeDescriptions = {};

		attributeDescriptions[0].binding = 0;
		attributeDescriptions[0].location = 0;
		attributeDescriptions[0].format = VK_FORMAT_R32G32_SFLOAT;
		attributeDescriptions[0].offset = offsetof(Vertex, pos);

		attributeDescriptions[1].binding = 0;
		attributeDescriptions[1].location = 1;
		attributeDescriptions[1].format = VK_FORMAT_R32G32B32_SFLOAT;
		attributeDescriptions[1].offset = offsetof(Vertex, color);

		return attributeDescriptions;
	}
};

struct UniformBufferObject {
	glm::mat4 model;
	glm::mat4 view;
	glm::mat4 proj;
};

const std::vector<Vertex> vertices = {
	{{-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
};

class HelloTriangleApplication {
public:
	void run() {
		initWindow();
		initVulkan();
		mainLoop();
		cleanup();
	}

private:
	GLFWwindow* window;

	VkInstance instance;
	VkDebugUtilsMessengerEXT debugMessenger;
	VkSurfaceKHR surface;

	VkPhysicalDevice physicalDevice = VK_NULL_HANDLE;
	VkDevice device;

	VkQueue graphicsQueue;
	VkQueue presentQueue;

	VkSwapchainKHR swapChain;
	std::vector<VkImage> swapChainImages;
	VkFormat swapChainImageFormat;
	VkExtent2D swapChainExtent;

	std::vector<VkImageView> swapChainImageViews;

	VkRenderPass renderPass;
	VkDescriptorSetLayout descriptorSetLayout;
	VkPipelineLayout pipelineLayout;
	VkPipeline graphicsPipeline;
	std::vector<VkFramebuffer> swapChainFramebuffers;

	VkCommandPool commandPool;
	std::vector<VkCommandBuffer> commandBuffers;

	VkSemaphore imageAvailableSemaphore;
	VkSemaphore renderFinishedSemaphore;

	std::vector<VkSemaphore> imageAvailableSemaphores;
	std::vector<VkSemaphore> renderFinishedSemaphores;
	std::vector<VkFence> inFlightFences;
	std::vector<VkFence> imagesInFlight;
	size_t currentFrame = 0;

	VkBuffer vertexBuffer;
	VkDeviceMemory vertexBufferMemory;
	VkBuffer indexBuffer;
	VkDeviceMemory indexBufferMemory;
	VkBuffer uniformBuffer;
	VkDeviceMemory uniformBufferMemory;

	VkDescriptorPool descriptorPool;
	VkDescriptorSet descriptorSet;

	void initWindow() {
		glfwInit();

		glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
		//glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);

		window = glfwCreateWindow(WIDTH, HEIGHT, "Vulkan_Day23_descriptor_layout", nullptr, nullptr);

		glfwSetWindowUserPointer(window, this);
		glfwSetWindowSizeCallback(window, HelloTriangleApplication::onWindowResized);
	}

	void initVulkan() {
		createInstance();
		setupDebugMessenger();
		createSurface();
		pickPhysicalDevice();
		createLogicalDevice();
		createSwapChain();
		createImageViews();
		createRenderPass();
		createDescriptorSetLayout();
		createGraphicsPipeline();
		createFramebuffers();
		createCommandPool();
		createVertexBuffer();
		createIndexBuffer();
		createUniformBuffer();
		createDescriptorPool();
		createDescriptorSet();
		createCommandBuffers();
		createSemaphores();
	}

	void mainLoop() {
		while (!glfwWindowShouldClose(window)) {
			glfwPollEvents();
			updateUniformBuffer();
			drawFrame();
		}

		vkDeviceWaitIdle(device);
	}

	void cleanup() {
		cleanupSwapChain();

		vkDestroyDescriptorPool(device, descriptorPool, nullptr);
		vkDestroyDescriptorSetLayout(device, descriptorSetLayout, nullptr);
		vkDestroyBuffer(device, uniformBuffer, nullptr);
		vkFreeMemory(device, uniformBufferMemory, nullptr);
		vkDestroyBuffer(device, indexBuffer, nullptr);
		vkFreeMemory(device, indexBufferMemory, nullptr);
		vkDestroyBuffer(device, vertexBuffer, nullptr);
		vkFreeMemory(device, vertexBufferMemory, nullptr);

		for (size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++) {
			vkDestroySemaphore(device, renderFinishedSemaphores[i], nullptr);
			vkDestroySemaphore(device, imageAvailableSemaphores[i], nullptr);
			vkDestroyFence(device, inFlightFences[i], nullptr);
		}

		vkDestroyCommandPool(device, commandPool, nullptr);

		vkDestroyDevice(device, nullptr);

		if (enableValidationLayers) {
			DestroyDebugUtilsMessengerEXT(instance, debugMessenger, nullptr);
		}

		vkDestroySurfaceKHR(instance, surface, nullptr);
		vkDestroyInstance(instance, nullptr);

		glfwDestroyWindow(window);

		glfwTerminate();
	}

	void updateUniformBuffer() {
		static auto startTime = std::chrono::high_resolution_clock::now();
		auto currentTime = std::chrono::high_resolution_clock::now();
		float time = std::chrono::duration_cast<std::chrono::milliseconds>(currentTime - startTime).count() / 1000.0f;

		UniformBufferObject ubo = {};
		ubo.model = glm::rotate(glm::mat4(1.0f), time * glm::radians(90.0f), glm::vec3(0.0f, 0.0f, 1.0f));

		ubo.view = glm::lookAt(glm::vec3(2.0f, 2.0f, 2.0f), glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f));

		ubo.proj = glm::perspective(glm::radians(45.0f), swapChainExtent.width / (float)swapChainExtent.height, 0.1f, 10.0f);

		ubo.proj[1][1] *= -1;

		void* data;
		vkMapMemory(device, uniformBufferMemory, 0, sizeof(ubo), 0, &data);
		memcpy(data, &ubo, sizeof(ubo));
		vkUnmapMemory(device, uniformBufferMemory);
	}

	void drawFrame() {
		vkWaitForFences(device, 1, &inFlightFences[currentFrame], VK_TRUE, UINT64_MAX);

		uint32_t imageIndex;
		VkResult result = vkAcquireNextImageKHR(device, swapChain, UINT64_MAX, imageAvailableSemaphores[currentFrame], VK_NULL_HANDLE, &imageIndex);

		if (result == VK_ERROR_OUT_OF_DATE_KHR) {
			recreateSwapChain();
			return;
		}
		else if (result != VK_SUCCESS && result != VK_SUBOPTIMAL_KHR) {
			throw std::runtime_error("failed to acquire swap chain image!");
		}

		if (imagesInFlight[imageIndex] != VK_NULL_HANDLE) {
			vkWaitForFences(device, 1, &imagesInFlight[imageIndex], VK_TRUE, UINT64_MAX);
		}
		imagesInFlight[imageIndex] = inFlightFences[currentFrame];

		VkSubmitInfo submitInfo = {};
		submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;

		VkSemaphore waitSemaphores[] = { imageAvailableSemaphores[currentFrame] };
		VkPipelineStageFlags waitStages[] = { VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT };
		submitInfo.waitSemaphoreCount = 1;
		submitInfo.pWaitSemaphores = waitSemaphores;
		submitInfo.pWaitDstStageMask = waitStages;

		submitInfo.commandBufferCount = 1;
		submitInfo.pCommandBuffers = &commandBuffers[imageIndex];

		VkSemaphore signalSemaphores[] = { renderFinishedSemaphores[currentFrame] };
		submitInfo.signalSemaphoreCount = 1;
		submitInfo.pSignalSemaphores = signalSemaphores;

		vkResetFences(device, 1, &inFlightFences[currentFrame]);

		if (vkQueueSubmit(graphicsQueue, 1, &submitInfo, inFlightFences[currentFrame]) != VK_SUCCESS) {
			throw std::runtime_error("failed to submit draw command buffer!");
		}

		VkPresentInfoKHR presentInfo = {};
		presentInfo.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR;

		presentInfo.waitSemaphoreCount = 1;
		presentInfo.pWaitSemaphores = signalSemaphores;

		VkSwapchainKHR swapChains[] = { swapChain };
		presentInfo.swapchainCount = 1;
		presentInfo.pSwapchains = swapChains;

		presentInfo.pImageIndices = &imageIndex;

		result = vkQueuePresentKHR(presentQueue, &presentInfo);

		if (result == VK_ERROR_OUT_OF_DATE_KHR || result == VK_SUBOPTIMAL_KHR) {
			recreateSwapChain();
		}
		else if (result != VK_SUCCESS) {
			throw std::runtime_error("failed to present swap chain image!");
		}

		currentFrame = (currentFrame + 1) % MAX_FRAMES_IN_FLIGHT;
	}

	static void onWindowResized(GLFWwindow* window, int width, int height) {
		if (width == 0 || height == 0) return;

		HelloTriangleApplication* app = reinterpret_cast<HelloTriangleApplication*>(glfwGetWindowUserPointer(window));
		app->recreateSwapChain();
	}

	void cleanupSwapChain() {
		for (auto framebuffer : swapChainFramebuffers) {
			vkDestroyFramebuffer(device, framebuffer, nullptr);
		}

		vkFreeCommandBuffers(device, commandPool, static_cast<uint32_t>(commandBuffers.size()), commandBuffers.data());

		vkDestroyPipeline(device, graphicsPipeline, nullptr);
		vkDestroyPipelineLayout(device, pipelineLayout, nullptr);
		vkDestroyRenderPass(device, renderPass, nullptr);

		for (auto imageView : swapChainImageViews) {
			vkDestroyImageView(device, imageView, nullptr);
		}

		vkDestroySwapchainKHR(device, swapChain, nullptr);
	}

	void recreateSwapChain() {
		int width = 0, height = 0;
		glfwGetFramebufferSize(window, &width, &height);
		while (width == 0 || height == 0) {
			glfwGetFramebufferSize(window, &width, &height);
			glfwWaitEvents();
		}

		vkDeviceWaitIdle(device);

		cleanupSwapChain();

		createSwapChain();
		createImageViews();
		createRenderPass();
		createGraphicsPipeline();
		createFramebuffers();
		createCommandBuffers();
	}

	void createInstance() {
		if (enableValidationLayers && !checkValidationLayerSupport()) {
			throw std::runtime_error("validation layers requested, but not available!");
		}

		VkApplicationInfo appInfo = {};
		appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
		appInfo.pApplicationName = "Hello Triangle";
		appInfo.applicationVersion = VK_MAKE_VERSION(1, 0, 0);
		appInfo.pEngineName = "No Engine";
		appInfo.engineVersion = VK_MAKE_VERSION(1, 0, 0);
		appInfo.apiVersion = VK_API_VERSION_1_0;

		VkInstanceCreateInfo createInfo = {};
		createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
		createInfo.pApplicationInfo = &appInfo;

		auto extensions = getRequiredExtensions();
		createInfo.enabledExtensionCount = static_cast<uint32_t>(extensions.size());
		createInfo.ppEnabledExtensionNames = extensions.data();

		VkDebugUtilsMessengerCreateInfoEXT debugCreateInfo;
		if (enableValidationLayers) {
			createInfo.enabledLayerCount = static_cast<uint32_t>(validationLayers.size());
			createInfo.ppEnabledLayerNames = validationLayers.data();

			populateDebugMessengerCreateInfo(debugCreateInfo);
			createInfo.pNext = (VkDebugUtilsMessengerCreateInfoEXT*)&debugCreateInfo;
		}
		else {
			createInfo.enabledLayerCount = 0;

			createInfo.pNext = nullptr;
		}

		if (vkCreateInstance(&createInfo, nullptr, &instance) != VK_SUCCESS) {
			throw std::runtime_error("failed to create instance!");
		}
	}

	void populateDebugMessengerCreateInfo(VkDebugUtilsMessengerCreateInfoEXT& createInfo) {
		createInfo = {};
		createInfo.sType = VK_STRUCTURE_TYPE_DEBUG_UTILS_MESSENGER_CREATE_INFO_EXT;
		createInfo.messageSeverity = VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_SEVERITY_WARNING_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_SEVERITY_ERROR_BIT_EXT;
		createInfo.messageType = VK_DEBUG_UTILS_MESSAGE_TYPE_GENERAL_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_TYPE_VALIDATION_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_TYPE_PERFORMANCE_BIT_EXT;
		createInfo.pfnUserCallback = debugCallback;
	}

	void setupDebugMessenger() {
		if (!enableValidationLayers) return;

		VkDebugUtilsMessengerCreateInfoEXT createInfo;
		populateDebugMessengerCreateInfo(createInfo);

		if (CreateDebugUtilsMessengerEXT(instance, &createInfo, nullptr, &debugMessenger) != VK_SUCCESS) {
			throw std::runtime_error("failed to set up debug messenger!");
		}
	}

	void createImageViews() {
		swapChainImageViews.resize(swapChainImages.size());
		for (size_t i = 0; i < swapChainImages.size(); i++) {
			VkImageViewCreateInfo createInfo = {};
			createInfo.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
			createInfo.image = swapChainImages[i];
			createInfo.viewType = VK_IMAGE_VIEW_TYPE_2D;
			createInfo.format = swapChainImageFormat;
			createInfo.components.r = VK_COMPONENT_SWIZZLE_IDENTITY;
			createInfo.components.g = VK_COMPONENT_SWIZZLE_IDENTITY;
			createInfo.components.b = VK_COMPONENT_SWIZZLE_IDENTITY;
			createInfo.components.a = VK_COMPONENT_SWIZZLE_IDENTITY;
			createInfo.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
			createInfo.subresourceRange.baseMipLevel = 0;
			createInfo.subresourceRange.levelCount = 1;
			createInfo.subresourceRange.baseArrayLayer = 0;
			createInfo.subresourceRange.layerCount = 1;

			if (vkCreateImageView(device, &createInfo, nullptr, &swapChainImageViews[i]) != VK_SUCCESS) {
				throw std::runtime_error("failed to create image views!");
			}
		}
	}

	void createSurface() {
		if (glfwCreateWindowSurface(instance, window, nullptr, &surface) != VK_SUCCESS) {
			throw std::runtime_error("failed to create window surface!");
		}
	}

	void pickPhysicalDevice() {
		uint32_t deviceCount = 0;
		vkEnumeratePhysicalDevices(instance, &deviceCount, nullptr);

		if (deviceCount == 0) {
			throw std::runtime_error("failed to find GPUs with Vulkan support!");
		}

		std::vector<VkPhysicalDevice> devices(deviceCount);
		vkEnumeratePhysicalDevices(instance, &deviceCount, devices.data());

		for (const auto& device : devices) {
			if (isDeviceSuitable(device)) {
				physicalDevice = device;
				break;
			}
		}

		if (physicalDevice == VK_NULL_HANDLE) {
			throw std::runtime_error("failed to find a suitable GPU!");
		}
	}

	void createLogicalDevice() {
		QueueFamilyIndices indices = findQueueFamilies(physicalDevice);
		std::vector<VkDeviceQueueCreateInfo> queueCreateInfos;
		std::set<uint32_t> uniqueQueueFamilies = { indices.graphicsFamily, indices.presentFamily };
		float queuePriority = 1.0f;
		for (int queueFamily : uniqueQueueFamilies) {
			VkDeviceQueueCreateInfo queueCreateInfo = {};
			queueCreateInfo.sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO;
			queueCreateInfo.queueFamilyIndex = queueFamily;
			queueCreateInfo.queueCount = 1;
			queueCreateInfo.pQueuePriorities = &queuePriority;
			queueCreateInfos.push_back(queueCreateInfo);
		}

		VkPhysicalDeviceFeatures deviceFeatures = {};

		VkDeviceCreateInfo createInfo = {};
		createInfo.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO;

		createInfo.pQueueCreateInfos = queueCreateInfos.data();
		createInfo.queueCreateInfoCount = static_cast<uint32_t>(queueCreateInfos.size());

		createInfo.pEnabledFeatures = &deviceFeatures;

		createInfo.enabledExtensionCount = static_cast<uint32_t>(deviceExtensions.size());
		createInfo.ppEnabledExtensionNames = deviceExtensions.data();

		if (enableValidationLayers) {
			createInfo.enabledLayerCount = static_cast<uint32_t>(validationLayers.size());
			createInfo.ppEnabledLayerNames = validationLayers.data();
		}
		else {
			createInfo.enabledLayerCount = 0;
		}

		if (vkCreateDevice(physicalDevice, &createInfo, nullptr, &device) != VK_SUCCESS) {
			throw std::runtime_error("failed to create logical device!");
		}

		vkGetDeviceQueue(device, indices.graphicsFamily, 0, &graphicsQueue);
		vkGetDeviceQueue(device, indices.presentFamily, 0, &presentQueue);
	}

	void createSwapChain() {
		SwapChainSupportDetails swapChainSupport = querySwapChainSupport(physicalDevice);

		VkSurfaceFormatKHR surfaceFormat = chooseSwapSurfaceFormat(swapChainSupport.formats);
		VkPresentModeKHR presentMode = chooseSwapPresentMode(swapChainSupport.presentModes);
		VkExtent2D extent = chooseSwapExtent(swapChainSupport.capabilities);

		uint32_t imageCount = swapChainSupport.capabilities.minImageCount + 1;
		if (swapChainSupport.capabilities.maxImageCount > 0 && imageCount > swapChainSupport.capabilities.maxImageCount) {
			imageCount = swapChainSupport.capabilities.maxImageCount;
		}

		VkSwapchainCreateInfoKHR createInfo = {};
		createInfo.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
		createInfo.surface = surface;

		createInfo.minImageCount = imageCount;
		createInfo.imageFormat = surfaceFormat.format;
		createInfo.imageColorSpace = surfaceFormat.colorSpace;
		createInfo.imageExtent = extent;
		createInfo.imageArrayLayers = 1;
		createInfo.imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;

		QueueFamilyIndices indices = findQueueFamilies(physicalDevice);
		uint32_t queueFamilyIndices[] = { (uint32_t)indices.graphicsFamily, (uint32_t)indices.presentFamily };

		if (indices.graphicsFamily != indices.presentFamily) {
			createInfo.imageSharingMode = VK_SHARING_MODE_CONCURRENT;
			createInfo.queueFamilyIndexCount = 2;
			createInfo.pQueueFamilyIndices = queueFamilyIndices;
		}
		else {
			createInfo.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
			createInfo.queueFamilyIndexCount = 0; // Optional
			createInfo.pQueueFamilyIndices = nullptr; // Optional
		}

		createInfo.preTransform = swapChainSupport.capabilities.currentTransform;
		createInfo.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
		createInfo.presentMode = presentMode;
		createInfo.clipped = VK_TRUE;
		createInfo.oldSwapchain = VK_NULL_HANDLE;

		if (vkCreateSwapchainKHR(device, &createInfo, nullptr, &swapChain) != VK_SUCCESS) {
			throw std::runtime_error("failed to create swap chain!");
		}

		vkGetSwapchainImagesKHR(device, swapChain, &imageCount, nullptr);
		swapChainImages.resize(imageCount);
		vkGetSwapchainImagesKHR(device, swapChain, &imageCount, swapChainImages.data());
		swapChainImageFormat = surfaceFormat.format;
		swapChainExtent = extent;
	}

	bool isDeviceSuitable(VkPhysicalDevice device) {
		QueueFamilyIndices indices = findQueueFamilies(device);
		bool extensionsSupported = checkDeviceExtensionSupport(device);

		bool swapChainAdequate = false;
		if (extensionsSupported) {
			SwapChainSupportDetails swapChainSupport = querySwapChainSupport(device);
			swapChainAdequate = !swapChainSupport.formats.empty() && !swapChainSupport.presentModes.empty();
		}
		return indices.isComplete() && extensionsSupported && swapChainAdequate;
	}

	void createRenderPass() {
		VkAttachmentDescription colorAttachment = {};
		colorAttachment.format = swapChainImageFormat;
		colorAttachment.samples = VK_SAMPLE_COUNT_1_BIT;
		colorAttachment.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
		colorAttachment.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
		colorAttachment.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
		colorAttachment.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
		colorAttachment.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
		colorAttachment.finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;

		VkAttachmentReference colorAttachmentRef = {};
		colorAttachmentRef.attachment = 0;
		colorAttachmentRef.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;

		VkSubpassDescription subpass = {};
		subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;

		subpass.colorAttachmentCount = 1;
		subpass.pColorAttachments = &colorAttachmentRef;

		VkRenderPassCreateInfo renderPassInfo = {};
		renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
		renderPassInfo.attachmentCount = 1;
		renderPassInfo.pAttachments = &colorAttachment;
		renderPassInfo.subpassCount = 1;
		renderPassInfo.pSubpasses = &subpass;
		VkSubpassDependency dependency = {};
		dependency.srcSubpass = VK_SUBPASS_EXTERNAL;
		dependency.dstSubpass = 0;
		dependency.srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
		dependency.srcAccessMask = 0;
		dependency.dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
		dependency.dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
		renderPassInfo.dependencyCount = 1;
		renderPassInfo.pDependencies = &dependency;

		if (vkCreateRenderPass(device, &renderPassInfo, nullptr, &renderPass) != VK_SUCCESS) {
			throw std::runtime_error("failed to create render pass!");
		}
	}

	VkShaderModule createShaderModule(const std::vector<char>& code) {
		VkShaderModuleCreateInfo createInfo = {};
		createInfo.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
		createInfo.codeSize = code.size();

		createInfo.pCode = reinterpret_cast<const uint32_t*>(code.data());

		VkShaderModule shaderModule;
		if (vkCreateShaderModule(device, &createInfo, nullptr, &shaderModule) != VK_SUCCESS) {
			throw std::runtime_error("failed to create shader module!");
		}
		return shaderModule;
	}

	static std::vector<char> readFile(const std::string& filename) {
		std::ifstream file(filename, std::ios::ate | std::ios::binary);

		if (!file.is_open()) {
			throw std::runtime_error("failed to open file!");
		}
		size_t fileSize = (size_t)file.tellg();
		std::vector<char> buffer(fileSize);
		file.seekg(0);
		file.read(buffer.data(), fileSize);
		file.close();
		return buffer;
	}

	void createSemaphores() {
		imageAvailableSemaphores.resize(MAX_FRAMES_IN_FLIGHT);
		renderFinishedSemaphores.resize(MAX_FRAMES_IN_FLIGHT);
		inFlightFences.resize(MAX_FRAMES_IN_FLIGHT);
		imagesInFlight.resize(swapChainImages.size(), VK_NULL_HANDLE);

		VkSemaphoreCreateInfo semaphoreInfo = {};
		semaphoreInfo.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;

		VkFenceCreateInfo fenceInfo = {};
		fenceInfo.sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO;
		fenceInfo.flags = VK_FENCE_CREATE_SIGNALED_BIT;

		for (size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++) {
			if (vkCreateSemaphore(device, &semaphoreInfo, nullptr, &imageAvailableSemaphores[i]) != VK_SUCCESS ||
				vkCreateSemaphore(device, &semaphoreInfo, nullptr, &renderFinishedSemaphores[i]) != VK_SUCCESS ||
				vkCreateFence(device, &fenceInfo, nullptr, &inFlightFences[i]) != VK_SUCCESS) {
				throw std::runtime_error("failed to create synchronization objects for a frame!");
			}
		}
	}

	void createCommandBuffers() {
		commandBuffers.resize(swapChainFramebuffers.size());
		VkCommandBufferAllocateInfo allocInfo = {};
		allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
		allocInfo.commandPool = commandPool;
		allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
		allocInfo.commandBufferCount = (uint32_t)commandBuffers.size();

		if (vkAllocateCommandBuffers(device, &allocInfo, commandBuffers.data()) != VK_SUCCESS) {
			throw std::runtime_error("failed to allocate command buffers!");
		}

		for (size_t i = 0; i < commandBuffers.size(); i++) {
			VkCommandBufferBeginInfo beginInfo = {};
			beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
			beginInfo.flags = VK_COMMAND_BUFFER_USAGE_SIMULTANEOUS_USE_BIT;
			beginInfo.pInheritanceInfo = nullptr; // Optional

			vkBeginCommandBuffer(commandBuffers[i], &beginInfo);

			VkRenderPassBeginInfo renderPassInfo = {};
			renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
			renderPassInfo.renderPass = renderPass;
			renderPassInfo.framebuffer = swapChainFramebuffers[i];

			renderPassInfo.renderArea.offset = { 0, 0 };
			renderPassInfo.renderArea.extent = swapChainExtent;

			VkClearValue clearColor = { 0.1f, 0.1f, 0.3f, 0.6f };
			renderPassInfo.clearValueCount = 1;
			renderPassInfo.pClearValues = &clearColor;
			vkCmdBeginRenderPass(commandBuffers[i], &renderPassInfo, VK_SUBPASS_CONTENTS_INLINE);

			//渲染期间绑定缓冲区
			vkCmdBindPipeline(commandBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, graphicsPipeline);

			VkBuffer vertexBuffers[] = { vertexBuffer };
			VkDeviceSize offsets[] = { 0 };
			//绑定顶点缓冲区
			vkCmdBindVertexBuffers(commandBuffers[i], 0, 1, vertexBuffers, offsets);

			vkCmdBindIndexBuffer(commandBuffers[i], indexBuffer, 0, VK_INDEX_TYPE_UINT16);

			vkCmdBindDescriptorSets(commandBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSet, 0, nullptr);

			vkCmdDrawIndexed(commandBuffers[i], static_cast<uint32_t>(indices.size()), 1, 0, 0, 0);

			//vkCmdDraw(commandBuffers[i], static_cast<uint32_t>(vertices.size()), 1, 0, 0);

			vkCmdEndRenderPass(commandBuffers[i]);

			if (vkEndCommandBuffer(commandBuffers[i]) != VK_SUCCESS) {
				throw std::runtime_error("failed to record command buffer!");
			}
		}

	}

	void createCommandPool() {
		QueueFamilyIndices queueFamilyIndices = findQueueFamilies(physicalDevice);

		VkCommandPoolCreateInfo poolInfo = {};
		poolInfo.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
		poolInfo.queueFamilyIndex = queueFamilyIndices.graphicsFamily;
		poolInfo.flags = 0; // Optional

		if (vkCreateCommandPool(device, &poolInfo, nullptr, &commandPool) != VK_SUCCESS) {
			throw std::runtime_error("failed to create command pool!");
		}
	}

	// 创建顶点缓冲区
	void createVertexBuffer() {

		VkBuffer stagingBuffer;
		VkDeviceMemory stagingBufferMemory;

		VkDeviceSize bufferSize = sizeof(vertices[0]) * vertices.size();
		createBuffer(bufferSize, VK_BUFFER_USAGE_TRANSFER_SRC_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, stagingBuffer, stagingBufferMemory);

		//*****填充顶点缓冲区*****
		void* data;
		//将缓冲区内存映射(mapping the buffer memory)到CPU可访问的内存中完成
		vkMapMemory(device, stagingBufferMemory, 0, bufferSize, 0, &data);
		//将顶点数据拷贝到映射内存中
		memcpy(data, vertices.data(), (size_t)bufferSize);
		//取消映射
		vkUnmapMemory(device, stagingBufferMemory);

		createBuffer(bufferSize, VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_VERTEX_BUFFER_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, vertexBuffer, vertexBufferMemory);

		copyBuffer(stagingBuffer, vertexBuffer, bufferSize);

		vkDestroyBuffer(device, stagingBuffer, nullptr);
		vkFreeMemory(device, stagingBufferMemory, nullptr);
	}

	// 创建索引缓冲区
	void 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 createUniformBuffer() {
		VkDeviceSize bufferSize = sizeof(UniformBufferObject);
		createBuffer(bufferSize, VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, uniformBuffer, uniformBufferMemory);
	}

	void createDescriptorPool() {
		VkDescriptorPoolSize poolSize = {};
		poolSize.type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
		poolSize.descriptorCount = 1;

		VkDescriptorPoolCreateInfo poolInfo = {};
		poolInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
		poolInfo.poolSizeCount = 1;
		poolInfo.pPoolSizes = &poolSize;
		poolInfo.maxSets = 1;
		if (vkCreateDescriptorPool(device, &poolInfo, nullptr, &descriptorPool) != VK_SUCCESS) {
			throw std::runtime_error("failed to create descriptor pool!");
		}
	}

	void createDescriptorSet() {
		VkDescriptorSetLayout layouts[] = { descriptorSetLayout };
		VkDescriptorSetAllocateInfo allocInfo = {};
		allocInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
		allocInfo.descriptorPool = descriptorPool;
		allocInfo.descriptorSetCount = 1;
		allocInfo.pSetLayouts = layouts;
		if (vkAllocateDescriptorSets(device, &allocInfo, &descriptorSet) != VK_SUCCESS) {
			throw std::runtime_error("failed to allocate descriptor set!");
		}

		VkDescriptorBufferInfo bufferInfo = {};
		bufferInfo.buffer = uniformBuffer;
		bufferInfo.offset = 0;
		bufferInfo.range = sizeof(UniformBufferObject);
		VkWriteDescriptorSet descriptorWrite = {};
		descriptorWrite.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
		descriptorWrite.dstSet = descriptorSet;
		descriptorWrite.dstBinding = 0;
		descriptorWrite.dstArrayElement = 0;
		descriptorWrite.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
		descriptorWrite.descriptorCount = 1;
		descriptorWrite.pBufferInfo = &bufferInfo;
		descriptorWrite.pImageInfo = nullptr; // Optional
		descriptorWrite.pTexelBufferView = nullptr; // Optional
		vkUpdateDescriptorSets(device, 1, &descriptorWrite, 0, nullptr);

	}

	//创建缓冲区
	void createBuffer(VkDeviceSize size, VkBufferUsageFlags usage, VkMemoryPropertyFlags properties, VkBuffer& buffer, VkDeviceMemory& bufferMemory) {

		//创建缓冲区
		VkBufferCreateInfo bufferInfo = {};
		bufferInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
		bufferInfo.size = size;
		bufferInfo.usage = usage;
		bufferInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
		if (vkCreateBuffer(device, &bufferInfo, nullptr, &buffer) != VK_SUCCESS) {
			throw std::runtime_error("failed to create buffer!");
		}

		//内存需求
		VkMemoryRequirements memRequirements;
		vkGetBufferMemoryRequirements(device, buffer, &memRequirements);

		//内存分配
		VkMemoryAllocateInfo allocInfo = {};
		allocInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
		allocInfo.allocationSize = memRequirements.size;
		allocInfo.memoryTypeIndex = findMemoryType(memRequirements.memoryTypeBits, properties);

		if (vkAllocateMemory(device, &allocInfo, nullptr, &bufferMemory) != VK_SUCCESS) {
			throw std::runtime_error("failed to allocate buffer memory!");
		}
		//将内存关联到缓冲区
		vkBindBufferMemory(device, buffer, bufferMemory, 0);
	}

	//用于从一个缓冲区拷贝数据到另一个缓冲区
	void copyBuffer(VkBuffer srcBuffer, VkBuffer dstBuffer, VkDeviceSize size) {
		VkCommandBufferAllocateInfo allocInfo = {};
		allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
		allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
		allocInfo.commandPool = commandPool;
		allocInfo.commandBufferCount = 1;

		VkCommandBuffer commandBuffer;
		vkAllocateCommandBuffers(device, &allocInfo, &commandBuffer);

		VkCommandBufferBeginInfo beginInfo = {};
		beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
		beginInfo.flags = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;

		vkBeginCommandBuffer(commandBuffer, &beginInfo);

		VkBufferCopy copyRegion = {};
		copyRegion.size = size;
		vkCmdCopyBuffer(commandBuffer, srcBuffer, dstBuffer, 1, &copyRegion);

		vkEndCommandBuffer(commandBuffer);

		VkSubmitInfo submitInfo = {};
		submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
		submitInfo.commandBufferCount = 1;
		submitInfo.pCommandBuffers = &commandBuffer;

		vkQueueSubmit(graphicsQueue, 1, &submitInfo, VK_NULL_HANDLE);
		vkQueueWaitIdle(graphicsQueue);

		vkFreeCommandBuffers(device, commandPool, 1, &commandBuffer);
	}

	uint32_t findMemoryType(uint32_t typeFilter, VkMemoryPropertyFlags properties) {
		VkPhysicalDeviceMemoryProperties memProperties;
		vkGetPhysicalDeviceMemoryProperties(physicalDevice, &memProperties);

		for (uint32_t i = 0; i < memProperties.memoryTypeCount; i++) {
			if ((typeFilter & (1 << i)) && (memProperties.memoryTypes[i].propertyFlags & properties) == properties) {
				return i;
			}
		}

		throw std::runtime_error("failed to find suitable memory type!");
	}

	void createFramebuffers() {
		swapChainFramebuffers.resize(swapChainImageViews.size());
		for (size_t i = 0; i < swapChainImageViews.size(); i++) {
			VkImageView attachments[] = {
				swapChainImageViews[i]
			};

			VkFramebufferCreateInfo framebufferInfo = {};
			framebufferInfo.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
			framebufferInfo.renderPass = renderPass;
			framebufferInfo.attachmentCount = 1;
			framebufferInfo.pAttachments = attachments;
			framebufferInfo.width = swapChainExtent.width;
			framebufferInfo.height = swapChainExtent.height;
			framebufferInfo.layers = 1;

			if (vkCreateFramebuffer(device, &framebufferInfo, nullptr, &swapChainFramebuffers[i]) != VK_SUCCESS) {
				throw std::runtime_error("failed to create framebuffer!");
			}
		}
	}

	void createDescriptorSetLayout() {
		VkDescriptorSetLayoutBinding uboLayoutBinding = {};
		uboLayoutBinding.binding = 0;
		uboLayoutBinding.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
		uboLayoutBinding.descriptorCount = 1;
		uboLayoutBinding.stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
		uboLayoutBinding.pImmutableSamplers = nullptr; // Optional

		VkDescriptorSetLayoutCreateInfo layoutInfo = {};
		layoutInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO;
		layoutInfo.bindingCount = 1;
		layoutInfo.pBindings = &uboLayoutBinding;

		if (vkCreateDescriptorSetLayout(device, &layoutInfo, nullptr, &descriptorSetLayout) != VK_SUCCESS) {
			throw std::runtime_error("failed to create descriptor set layout!");
		}
	}

	void createGraphicsPipeline() {
		auto vertShaderCode = readFile("shader.vert.spv");
		auto fragShaderCode = readFile("shader.frag.spv");

		VkShaderModule vertShaderModule = createShaderModule(vertShaderCode);
		VkShaderModule fragShaderModule = createShaderModule(fragShaderCode);

		VkPipelineShaderStageCreateInfo vertShaderStageInfo = {};
		vertShaderStageInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
		vertShaderStageInfo.stage = VK_SHADER_STAGE_VERTEX_BIT;
		vertShaderStageInfo.module = vertShaderModule;
		vertShaderStageInfo.pName = "main";

		VkPipelineShaderStageCreateInfo fragShaderStageInfo = {};
		fragShaderStageInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
		fragShaderStageInfo.stage = VK_SHADER_STAGE_FRAGMENT_BIT;
		fragShaderStageInfo.module = fragShaderModule;
		fragShaderStageInfo.pName = "main";

		VkPipelineShaderStageCreateInfo shaderStages[] = { vertShaderStageInfo, fragShaderStageInfo };

		VkPipelineVertexInputStateCreateInfo vertexInputInfo = {};
		vertexInputInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;

		//配置图形管线可以接受重新定义的顶点数据的格式
		auto bindingDescription = Vertex::getBindingDescription();
		auto attributeDescriptions = Vertex::getAttributeDescriptions();

		vertexInputInfo.vertexBindingDescriptionCount = 1;
		vertexInputInfo.vertexAttributeDescriptionCount = static_cast<uint32_t>(attributeDescriptions.size());
		vertexInputInfo.pVertexBindingDescriptions = &bindingDescription;
		vertexInputInfo.pVertexAttributeDescriptions = attributeDescriptions.data();

		VkPipelineInputAssemblyStateCreateInfo inputAssembly = {};
		inputAssembly.sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO;
		inputAssembly.topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
		inputAssembly.primitiveRestartEnable = VK_FALSE;

		VkViewport viewport = {};
		viewport.x = 0.0f;
		viewport.y = 0.0f;
		viewport.width = (float)swapChainExtent.width;
		viewport.height = (float)swapChainExtent.height;
		viewport.minDepth = 0.0f;
		viewport.maxDepth = 1.0f;

		VkRect2D scissor = {};
		scissor.offset = { 0, 0 };
		scissor.extent = swapChainExtent;

		VkPipelineViewportStateCreateInfo viewportState = {};
		viewportState.sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO;
		viewportState.viewportCount = 1;
		viewportState.pViewports = &viewport;
		viewportState.scissorCount = 1;
		viewportState.pScissors = &scissor;

		VkPipelineRasterizationStateCreateInfo rasterizer = {};
		rasterizer.sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO;
		rasterizer.depthClampEnable = VK_FALSE;
		rasterizer.rasterizerDiscardEnable = VK_FALSE;
		rasterizer.polygonMode = VK_POLYGON_MODE_FILL;
		rasterizer.lineWidth = 1.0f;
		rasterizer.cullMode = VK_CULL_MODE_BACK_BIT;
		rasterizer.frontFace = VK_FRONT_FACE_COUNTER_CLOCKWISE;
		rasterizer.depthBiasEnable = VK_FALSE;

		VkPipelineMultisampleStateCreateInfo multisampling = {};
		multisampling.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
		multisampling.sampleShadingEnable = VK_FALSE;
		multisampling.rasterizationSamples = VK_SAMPLE_COUNT_1_BIT;
		multisampling.minSampleShading = 1.0f; // Optional
		multisampling.pSampleMask = nullptr; // Optional
		multisampling.alphaToCoverageEnable = VK_FALSE; // Optional
		multisampling.alphaToOneEnable = VK_FALSE; // Optional

		VkPipelineColorBlendAttachmentState colorBlendAttachment = {};
		colorBlendAttachment.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT | VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
		colorBlendAttachment.blendEnable = VK_FALSE;
		colorBlendAttachment.srcColorBlendFactor = VK_BLEND_FACTOR_ONE; // Optional
		colorBlendAttachment.dstColorBlendFactor = VK_BLEND_FACTOR_ZERO; // Optional
		colorBlendAttachment.colorBlendOp = VK_BLEND_OP_ADD; // Optional
		colorBlendAttachment.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE; // Optional
		colorBlendAttachment.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO; // Optional
		colorBlendAttachment.alphaBlendOp = VK_BLEND_OP_ADD; // Optional

		VkPipelineColorBlendStateCreateInfo colorBlending = {};
		colorBlending.sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;
		colorBlending.logicOpEnable = VK_FALSE;
		colorBlending.logicOp = VK_LOGIC_OP_COPY;
		colorBlending.attachmentCount = 1;
		colorBlending.pAttachments = &colorBlendAttachment;
		colorBlending.blendConstants[0] = 0.0f;
		colorBlending.blendConstants[1] = 0.0f;
		colorBlending.blendConstants[2] = 0.0f;
		colorBlending.blendConstants[3] = 0.0f;

		VkPipelineLayoutCreateInfo pipelineLayoutInfo = {};
		pipelineLayoutInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
		pipelineLayoutInfo.setLayoutCount = 1; // Optional
		pipelineLayoutInfo.pSetLayouts = &descriptorSetLayout; // Optional
		pipelineLayoutInfo.pushConstantRangeCount = 0; // Optional
		pipelineLayoutInfo.pPushConstantRanges = 0; // Optional

		if (vkCreatePipelineLayout(device, &pipelineLayoutInfo, nullptr, &pipelineLayout) != VK_SUCCESS) {
			throw std::runtime_error("failed to create pipeline layout!");
		}

		VkGraphicsPipelineCreateInfo pipelineInfo = {};
		pipelineInfo.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
		pipelineInfo.stageCount = 2;
		pipelineInfo.pStages = shaderStages;

		pipelineInfo.pVertexInputState = &vertexInputInfo;
		pipelineInfo.pInputAssemblyState = &inputAssembly;
		pipelineInfo.pViewportState = &viewportState;
		pipelineInfo.pRasterizationState = &rasterizer;
		pipelineInfo.pMultisampleState = &multisampling;
		pipelineInfo.pDepthStencilState = nullptr; // Optional
		pipelineInfo.pColorBlendState = &colorBlending;
		pipelineInfo.pDynamicState = nullptr; // Optional

		pipelineInfo.layout = pipelineLayout;
		pipelineInfo.renderPass = renderPass;
		pipelineInfo.subpass = 0;
		pipelineInfo.basePipelineHandle = VK_NULL_HANDLE; // Optional
		pipelineInfo.basePipelineIndex = -1; // Optional

		if (vkCreateGraphicsPipelines(device, VK_NULL_HANDLE, 1, &pipelineInfo, nullptr, &graphicsPipeline) != VK_SUCCESS) {
			throw std::runtime_error("failed to create graphics pipeline!");
		}

		vkDestroyShaderModule(device, fragShaderModule, nullptr);
		vkDestroyShaderModule(device, vertShaderModule, nullptr);
	}

	bool checkDeviceExtensionSupport(VkPhysicalDevice device) {
		uint32_t extensionCount;
		vkEnumerateDeviceExtensionProperties(device, nullptr, &extensionCount, nullptr);

		std::vector<VkExtensionProperties> availableExtensions(extensionCount);
		vkEnumerateDeviceExtensionProperties(device, nullptr, &extensionCount, availableExtensions.data());

		std::set<std::string> requiredExtensions(deviceExtensions.begin(), deviceExtensions.end());

		for (const auto& extension : availableExtensions) {
			requiredExtensions.erase(extension.extensionName);
		}

		return requiredExtensions.empty();
	}

	VkExtent2D chooseSwapExtent(const VkSurfaceCapabilitiesKHR& capabilities) {
		if (capabilities.currentExtent.width != std::numeric_limits<uint32_t>::max()) {
			return capabilities.currentExtent;
		}
		else {
			int width, height;
			glfwGetFramebufferSize(window, &width, &height);

			VkExtent2D actualExtent = {
				static_cast<uint32_t>(width),
				static_cast<uint32_t>(height)
			};
			//VkExtent2D actualExtent = { WIDTH, HEIGHT };
			actualExtent.width = std::max(capabilities.minImageExtent.width, std::min(capabilities.maxImageExtent.width, actualExtent.width));
			actualExtent.height = std::max(capabilities.minImageExtent.height, std::min(capabilities.maxImageExtent.height, actualExtent.height));

			return actualExtent;
		}
	}

	SwapChainSupportDetails querySwapChainSupport(VkPhysicalDevice device) {
		SwapChainSupportDetails details;

		vkGetPhysicalDeviceSurfaceCapabilitiesKHR(device, surface, &details.capabilities);

		uint32_t formatCount;
		vkGetPhysicalDeviceSurfaceFormatsKHR(device, surface, &formatCount, nullptr);

		if (formatCount != 0) {
			details.formats.resize(formatCount);
			vkGetPhysicalDeviceSurfaceFormatsKHR(device, surface, &formatCount, details.formats.data());
		}

		uint32_t presentModeCount;
		vkGetPhysicalDeviceSurfacePresentModesKHR(device, surface, &presentModeCount, nullptr);

		if (presentModeCount != 0) {
			details.presentModes.resize(presentModeCount);
			vkGetPhysicalDeviceSurfacePresentModesKHR(device, surface, &presentModeCount, details.presentModes.data());
		}

		return details;
	}

	VkSurfaceFormatKHR chooseSwapSurfaceFormat(const std::vector<VkSurfaceFormatKHR>& availableFormats) {
		if (availableFormats.size() == 1 && availableFormats[0].format == VK_FORMAT_UNDEFINED) {
			return { VK_FORMAT_B8G8R8A8_UNORM, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR };
		}
		for (const auto& availableFormat : availableFormats) {
			if (availableFormat.format == VK_FORMAT_B8G8R8A8_UNORM && availableFormat.colorSpace == VK_COLOR_SPACE_SRGB_NONLINEAR_KHR) {
				return availableFormat;
			}
		}
		return availableFormats[0];
	}

	VkPresentModeKHR chooseSwapPresentMode(const std::vector<VkPresentModeKHR> availablePresentModes) {
		VkPresentModeKHR bestMode = VK_PRESENT_MODE_FIFO_KHR;

		for (const auto& availablePresentMode : availablePresentModes) {
			if (availablePresentMode == VK_PRESENT_MODE_MAILBOX_KHR) {
				return availablePresentMode;
			}
			else if (availablePresentMode == VK_PRESENT_MODE_IMMEDIATE_KHR) {
				bestMode = availablePresentMode;
			}
		}

		return bestMode;
	}

	QueueFamilyIndices findQueueFamilies(VkPhysicalDevice device) {
		QueueFamilyIndices indices;

		uint32_t queueFamilyCount = 0;
		vkGetPhysicalDeviceQueueFamilyProperties(device, &queueFamilyCount, nullptr);

		std::vector<VkQueueFamilyProperties> queueFamilies(queueFamilyCount);
		vkGetPhysicalDeviceQueueFamilyProperties(device, &queueFamilyCount, queueFamilies.data());

		int i = 0;
		for (const auto& queueFamily : queueFamilies) {
			if (queueFamily.queueCount > 0 && queueFamily.queueFlags & VK_QUEUE_GRAPHICS_BIT) {
				indices.graphicsFamily = i;
			}

			VkBool32 presentSupport = false;
			vkGetPhysicalDeviceSurfaceSupportKHR(device, i, surface, &presentSupport);

			if (presentSupport) {
				indices.presentFamily = i;
			}

			if (indices.isComplete()) {
				break;
			}

			i++;
		}

		return indices;
	}

	std::vector<const char*> getRequiredExtensions() {
		uint32_t glfwExtensionCount = 0;
		const char** glfwExtensions;
		glfwExtensions = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);

		std::vector<const char*> extensions(glfwExtensions, glfwExtensions + glfwExtensionCount);

		if (enableValidationLayers) {
			extensions.push_back(VK_EXT_DEBUG_UTILS_EXTENSION_NAME);
		}

		return extensions;
	}

	bool checkValidationLayerSupport() {
		uint32_t layerCount;
		vkEnumerateInstanceLayerProperties(&layerCount, nullptr);

		std::vector<VkLayerProperties> availableLayers(layerCount);
		vkEnumerateInstanceLayerProperties(&layerCount, availableLayers.data());

		for (const char* layerName : validationLayers) {
			bool layerFound = false;

			for (const auto& layerProperties : availableLayers) {
				if (strcmp(layerName, layerProperties.layerName) == 0) {
					layerFound = true;
					break;
				}
			}

			if (!layerFound) {
				return false;
			}
		}

		return true;
	}

	static VKAPI_ATTR VkBool32 VKAPI_CALL debugCallback(VkDebugUtilsMessageSeverityFlagBitsEXT messageSeverity, VkDebugUtilsMessageTypeFlagsEXT messageType, const VkDebugUtilsMessengerCallbackDataEXT* pCallbackData, void* pUserData) {
		std::cerr << "validation layer: " << pCallbackData->pMessage << std::endl;

		return VK_FALSE;
	}
};

int main() {
	HelloTriangleApplication app;

	try {
		app.run();
	}
	catch (const std::exception& e) {
		std::cerr << e.what() << std::endl;
		return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;
}