#define GLFW_INCLUDE_VULKAN

#include <GLFW/glfw3.h>

#include <iostream>

#include <stdexcept>

#include <functional>

#include <vector>

#include <cstring>

const int WIDTH = 800;

const int HEIGHT = 600;

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

"VK_LAYER_LUNARG_standard_validation"

};

#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, VkAllocationCallbacks*) {}) {}

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;

}

};

class HelloTriangleApplication {

public:

void run() {

initWindow();

initVulkan();

mainLoop();

}

private:

GLFWwindow* window;

VDeleter<VkInstance> instance{vkDestroyInstance};

VDeleter<VkDebugReportCallbackEXT> callback{instance, DestroyDebugReportCallbackEXT};

void initWindow() {

glfwInit();

glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);

glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);

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

}

void initVulkan() {

createInstance();

setupDebugCallback();

}

void mainLoop() {

while (!glfwWindowShouldClose(window)) {

glfwPollEvents();

}

}

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 = debugCallback;

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

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

}

}

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;

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(VkDebugReportFlagsEXT flags, VkDebugReportObjectTypeEXT objType, uint64_t obj, size_t location, int32_t code, const char* layerPrefix, const char* msg, void* userData) {

std::cerr << "validation layer: " << msg << std::endl;

return VK_FALSE;

}

};

int main() {

HelloTriangleApplication app;

try {

app.run();

} catch (const std::runtime_error& e) {

std::cerr << e.what() << std::endl;

return EXIT_FAILURE;

}

return EXIT_SUCCESS;

}