#define GLFW_INCLUDE_VULKAN

#include <GLFW/glfw3.h>

#include <glm/glm.hpp>

#include <iostream>

#include <stdexcept>

#include <functional>

#include <fstream>

#include <algorithm>

#include <vector>

#include <cstring>

#include <array>

#include <set>

const int WIDTH = 800;

const int HEIGHT = 600;

const std::vector<const char*> validationLayers = {

"VK_LAYER_LUNARG_standard_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 CreateDebugReportCallbackEXT(VkInstance instance, const VkDebugReportCallbackCreateInfoEXT* pCreateInfo, const VkAllocationCallbacks* pAllocator, VkDebugReportCallbackEXT* pCallback) {

auto func = (PFN_vkCreateDebugReportCallbackEXT) vkGetInstanceProcAddr(instance, "vkCreateDebugReportCallbackEXT");

if (func != nullptr) {

return func(instance, pCreateInfo, pAllocator, pCallback);

} else {

return VK_ERROR_EXTENSION_NOT_PRESENT;

}

}

void DestroyDebugReportCallbackEXT(VkInstance instance, VkDebugReportCallbackEXT callback, const VkAllocationCallbacks* pAllocator) {

auto func = (PFN_vkDestroyDebugReportCallbackEXT) vkGetInstanceProcAddr(instance, "vkDestroyDebugReportCallbackEXT");

if (func != nullptr) {

func(instance, callback, pAllocator);

}

}

template <typename T>

class VDeleter {

public:

VDeleter() : VDeleter([](T _) {}) {}

VDeleter(std::function<void(T, VkAllocationCallbacks*)> deletef) {

this->deleter = [=](T obj) { deletef(obj, nullptr); };

}

VDeleter(const VDeleter<VkInstance>& instance, std::function<void(VkInstance, T, VkAllocationCallbacks*)> deletef) {

this->deleter = [&instance, deletef](T obj) { deletef(instance, obj, nullptr); };

}

VDeleter(const VDeleter<VkDevice>& device, std::function<void(VkDevice, T, VkAllocationCallbacks*)> deletef) {

this->deleter = [&device, deletef](T obj) { deletef(device, obj, nullptr); };

}

~VDeleter() {

cleanup();

}

T* operator &() {

cleanup();

return &object;

}

operator T() const {

return object;

}

private:

T object{VK_NULL_HANDLE};

std::function<void(T)> deleter;

void cleanup() {

if (object != VK_NULL_HANDLE) {

deleter(object);

}

object = VK_NULL_HANDLE;

}

};

struct QueueFamilyIndices {

int graphicsFamily = -1;

int 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;

static VkVertexInputBindingDescription getBindingDescription() {

VkVertexInputBindingDescription bindingDescription = {};

bindingDescription.binding = 0;

bindingDescription.stride = sizeof(Vertex);

bindingDescription.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;

return bindingDescription;

}

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;

}

};

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}}

};

class HelloTriangleApplication {

public:

void run() {

initWindow();

initVulkan();

mainLoop();

}

private:

GLFWwindow* window;

VDeleter<VkInstance> instance{vkDestroyInstance};

VDeleter<VkDebugReportCallbackEXT> callback{instance, DestroyDebugReportCallbackEXT};

VDeleter<VkSurfaceKHR> surface{instance, vkDestroySurfaceKHR};

VkPhysicalDevice physicalDevice = VK_NULL_HANDLE;

VDeleter<VkDevice> device{vkDestroyDevice};

VkQueue graphicsQueue;

VkQueue presentQueue;

VDeleter<VkSwapchainKHR> swapChain{device, vkDestroySwapchainKHR};

std::vector<VkImage> swapChainImages;

VkFormat swapChainImageFormat;

VkExtent2D swapChainExtent;

std::vector<VDeleter<VkImageView>> swapChainImageViews;

std::vector<VDeleter<VkFramebuffer>> swapChainFramebuffers;

VDeleter<VkRenderPass> renderPass{device, vkDestroyRenderPass};

VDeleter<VkPipelineLayout> pipelineLayout{device, vkDestroyPipelineLayout};

VDeleter<VkPipeline> graphicsPipeline{device, vkDestroyPipeline};

VDeleter<VkCommandPool> commandPool{device, vkDestroyCommandPool};

VDeleter<VkBuffer> vertexBuffer{device, vkDestroyBuffer};

VDeleter<VkDeviceMemory> vertexBufferMemory{device, vkFreeMemory};

std::vector<VkCommandBuffer> commandBuffers;

VDeleter<VkSemaphore> imageAvailableSemaphore{device, vkDestroySemaphore};

VDeleter<VkSemaphore> renderFinishedSemaphore{device, vkDestroySemaphore};

void initWindow() {

glfwInit();

glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);

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

glfwSetWindowUserPointer(window, this);

glfwSetWindowSizeCallback(window, HelloTriangleApplication::onWindowResized);

}

void initVulkan() {

createInstance();

setupDebugCallback();

createSurface();

pickPhysicalDevice();

createLogicalDevice();

createSwapChain();

createImageViews();

createRenderPass();

createGraphicsPipeline();

createFramebuffers();

createCommandPool();

createVertexBuffer();

createCommandBuffers();

createSemaphores();

}

void mainLoop() {

while (!glfwWindowShouldClose(window)) {

glfwPollEvents();

drawFrame();

}

vkDeviceWaitIdle(device);

}

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 recreateSwapChain() {

vkDeviceWaitIdle(device);

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 = extensions.size();

createInfo.ppEnabledExtensionNames = extensions.data();

if (enableValidationLayers) {

createInfo.enabledLayerCount = validationLayers.size();

createInfo.ppEnabledLayerNames = validationLayers.data();

} else {

createInfo.enabledLayerCount = 0;

}

if (vkCreateInstance(&createInfo, nullptr, &instance) != VK_SUCCESS) {

throw std::runtime_error("failed to create instance!");

}

}

void setupDebugCallback() {

if (!enableValidationLayers) return;

VkDebugReportCallbackCreateInfoEXT createInfo = {};

createInfo.sType = VK_STRUCTURE_TYPE_DEBUG_REPORT_CALLBACK_CREATE_INFO_EXT;

createInfo.flags = VK_DEBUG_REPORT_ERROR_BIT_EXT | VK_DEBUG_REPORT_WARNING_BIT_EXT;

createInfo.pfnCallback = (PFN_vkDebugReportCallbackEXT) debugCallback;

if (CreateDebugReportCallbackEXT(instance, &createInfo, nullptr, &callback) != VK_SUCCESS) {

throw std::runtime_error("failed to set up debug callback!");

}

}

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<int> uniqueQueueFamilies = {indices.graphicsFamily, indices.presentFamily};

for (int queueFamily : uniqueQueueFamilies) {

float queuePriority = 1.0f;

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 = (uint32_t) queueCreateInfos.size();

createInfo.pEnabledFeatures = &deviceFeatures;

createInfo.enabledExtensionCount = deviceExtensions.size();

createInfo.ppEnabledExtensionNames = deviceExtensions.data();

if (enableValidationLayers) {

createInfo.enabledLayerCount = 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.preTransform = swapChainSupport.capabilities.currentTransform;

createInfo.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;

createInfo.presentMode = presentMode;

createInfo.clipped = VK_TRUE;

VkSwapchainKHR oldSwapChain = swapChain;

createInfo.oldSwapchain = oldSwapChain;

VkSwapchainKHR newSwapChain;

if (vkCreateSwapchainKHR(device, &createInfo, nullptr, &newSwapChain) != VK_SUCCESS) {

throw std::runtime_error("failed to create swap chain!");

}

*&swapChain = newSwapChain;

vkGetSwapchainImagesKHR(device, swapChain, &imageCount, nullptr);

swapChainImages.resize(imageCount);

vkGetSwapchainImagesKHR(device, swapChain, &imageCount, swapChainImages.data());

swapChainImageFormat = surfaceFormat.format;

swapChainExtent = extent;

}

void createImageViews() {

swapChainImageViews.resize(swapChainImages.size(), VDeleter<VkImageView>{device, vkDestroyImageView});

for (uint32_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 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;

VkSubpassDependency dependency = {};

dependency.srcSubpass = VK_SUBPASS_EXTERNAL;

dependency.dstSubpass = 0;

dependency.srcStageMask = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;

dependency.srcAccessMask = VK_ACCESS_MEMORY_READ_BIT;

dependency.dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;

dependency.dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;

VkRenderPassCreateInfo renderPassInfo = {};

renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;

renderPassInfo.attachmentCount = 1;

renderPassInfo.pAttachments = &colorAttachment;

renderPassInfo.subpassCount = 1;

renderPassInfo.pSubpasses = &subPass;

renderPassInfo.dependencyCount = 1;

renderPassInfo.pDependencies = &dependency;

if (vkCreateRenderPass(device, &renderPassInfo, nullptr, &renderPass) != VK_SUCCESS) {

throw std::runtime_error("failed to create render pass!");

}

}

void createGraphicsPipeline() {

auto vertShaderCode = readFile("shaders/vert.spv");

auto fragShaderCode = readFile("shaders/frag.spv");

VDeleter<VkShaderModule> vertShaderModule{device, vkDestroyShaderModule};

VDeleter<VkShaderModule> fragShaderModule{device, vkDestroyShaderModule};

createShaderModule(vertShaderCode, vertShaderModule);

createShaderModule(fragShaderCode, fragShaderModule);

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;

auto bindingDescription = Vertex::getBindingDescription();

auto attributeDescriptions = Vertex::getAttributeDescriptions();

vertexInputInfo.vertexBindingDescriptionCount = 1;

vertexInputInfo.vertexAttributeDescriptionCount = 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_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;

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;

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 = 0;

pipelineLayoutInfo.pushConstantRangeCount = 0;

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.pColorBlendState = &colorBlending;

pipelineInfo.layout = pipelineLayout;

pipelineInfo.renderPass = renderPass;

pipelineInfo.subpass = 0;

pipelineInfo.basePipelineHandle = VK_NULL_HANDLE;

if (vkCreateGraphicsPipelines(device, VK_NULL_HANDLE, 1, &pipelineInfo, nullptr, &graphicsPipeline) != VK_SUCCESS) {

throw std::runtime_error("failed to create graphics pipeline!");

}

}

void createFramebuffers() {

swapChainFramebuffers.resize(swapChainImageViews.size(), VDeleter<VkFramebuffer>{device, vkDestroyFramebuffer});

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 createCommandPool() {

QueueFamilyIndices queueFamilyIndices = findQueueFamilies(physicalDevice);

VkCommandPoolCreateInfo poolInfo = {};

poolInfo.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;

poolInfo.queueFamilyIndex = queueFamilyIndices.graphicsFamily;

if (vkCreateCommandPool(device, &poolInfo, nullptr, &commandPool) != VK_SUCCESS) {

throw std::runtime_error("failed to create graphics command pool!");

}

}

void createVertexBuffer() {

VkDeviceSize bufferSize = sizeof(vertices[0]) * vertices.size();

VDeleter<VkBuffer> stagingBuffer{device, vkDestroyBuffer};

VDeleter<VkDeviceMemory> stagingBufferMemory{device, vkFreeMemory};

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, vertices.data(), (size_t) bufferSize);

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);

}

void createBuffer(VkDeviceSize size, VkBufferUsageFlags usage, VkMemoryPropertyFlags properties, VDeleter<VkBuffer>& buffer, VDeleter<VkDeviceMemory>& bufferMemory) {

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!");

}

VkMemoryRequirements memRequirements;

vkGetBufferMemoryRequirements(device, buffer, &memRequirements);

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!");

}

vkBindBufferMemory(device, buffer, bufferMemory, 0);

}

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 createCommandBuffers() {

if (commandBuffers.size() > 0) {

vkFreeCommandBuffers(device, commandPool, commandBuffers.size(), commandBuffers.data());

}

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;

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 = {0.0f, 0.0f, 0.0f, 1.0f};

renderPassInfo.clearValueCount = 1;

renderPassInfo.pClearValues = &clearColor;

vkCmdBeginRenderPass(commandBuffers[i], &renderPassInfo, VK_SUBPASS_CONTENTS_INLINE);

vkCmdBindPipeline(commandBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, graphicsPipeline);

VkBuffer vertexBuffers[] = {vertexBuffer};

VkDeviceSize offsets[] = {0};

vkCmdBindVertexBuffers(commandBuffers[i], 0, 1, vertexBuffers, offsets);

vkCmdDraw(commandBuffers[i], vertices.size(), 1, 0, 0);

vkCmdEndRenderPass(commandBuffers[i]);

if (vkEndCommandBuffer(commandBuffers[i]) != VK_SUCCESS) {

throw std::runtime_error("failed to record command buffer!");

}

}

}

void createSemaphores() {

VkSemaphoreCreateInfo semaphoreInfo = {};

semaphoreInfo.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;

if (vkCreateSemaphore(device, &semaphoreInfo, nullptr, &imageAvailableSemaphore) != VK_SUCCESS ||

vkCreateSemaphore(device, &semaphoreInfo, nullptr, &renderFinishedSemaphore) != VK_SUCCESS) {

throw std::runtime_error("failed to create semaphores!");

}

}

void drawFrame() {

uint32_t imageIndex;

VkResult result = vkAcquireNextImageKHR(device, swapChain, std::numeric_limits<uint64_t>::max(), imageAvailableSemaphore, 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!");

}

VkSubmitInfo submitInfo = {};

submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;

VkSemaphore waitSemaphores[] = {imageAvailableSemaphore};

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[] = {renderFinishedSemaphore};

submitInfo.signalSemaphoreCount = 1;

submitInfo.pSignalSemaphores = signalSemaphores;

if (vkQueueSubmit(graphicsQueue, 1, &submitInfo, VK_NULL_HANDLE) != 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!");

}

}

void createShaderModule(const std::vector<char>& code, VDeleter<VkShaderModule>& shaderModule) {

VkShaderModuleCreateInfo createInfo = {};

createInfo.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;

createInfo.codeSize = code.size();

createInfo.pCode = (uint32_t*) code.data();

if (vkCreateShaderModule(device, &createInfo, nullptr, &shaderModule) != VK_SUCCESS) {

throw std::runtime_error("failed to create shader module!");

}

}

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) {

for (const auto& availablePresentMode : availablePresentModes) {

if (availablePresentMode == VK_PRESENT_MODE_MAILBOX_KHR) {

return availablePresentMode;

}

}

return VK_PRESENT_MODE_FIFO_KHR;

}

VkExtent2D chooseSwapExtent(const VkSurfaceCapabilitiesKHR& capabilities) {

if (capabilities.currentExtent.width != std::numeric_limits<uint32_t>::max()) {

return capabilities.currentExtent;

} else {

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;

}

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;

}

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();

}

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 (queueFamily.queueCount > 0 && presentSupport) {

indices.presentFamily = i;

}

if (indices.isComplete()) {

break;

}

i++;

}

return indices;

}

std::vector<const char*> getRequiredExtensions() {

std::vector<const char*> extensions;

unsigned int glfwExtensionCount = 0;

const char** glfwExtensions;

glfwExtensions = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);

for (unsigned int i = 0; i < glfwExtensionCount; i++) {

extensions.push_back(glfwExtensions[i]);

}

if (enableValidationLayers) {

extensions.push_back(VK_EXT_DEBUG_REPORT_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;