#include <iostream>
#include <vector>
#include <algorithm>
#include <string.h>
#include "driver/CustomAssert.h"

#include <vulkan/vulkan.h>

#include "driver/vkExt.h"

//#define GLFW_INCLUDE_VULKAN
//#define VK_USE_PLATFORM_WIN32_KHR
//#include <GLFW/glfw3.h>

//#define GLFW_EXPOSE_NATIVE_WIN32
//#include <GLFW/glfw3native.h>

//GLFWwindow * window;

//#define WINDOW_WIDTH 640
//#define WINDOW_HEIGHT 480

// Note: support swap chain recreation (not only required for resized windows!)
// Note: window resize may not result in Vulkan telling that the swap chain should be recreated, should be handled explicitly!
void run();
void setupVulkan();
void mainLoop();
void cleanup();
void createInstance();
void createWindowSurface();
void findPhysicalDevice();
void checkSwapChainSupport();
void findQueueFamilies();
void createLogicalDevice();
void createSemaphores();
void createSwapChain();
void createCommandQueues();
void draw();
void CreateRenderPass();
void CreateFramebuffer();
void CreateShaders();
void CreatePipeline();
 void CreateDescriptorSet();
void CreateVertexBuffer();
void CreateTexture();
void recordCommandBuffers();
VkSurfaceFormatKHR chooseSurfaceFormat(const std::vector<VkSurfaceFormatKHR>& availableFormats);
VkExtent2D chooseSwapExtent(const VkSurfaceCapabilitiesKHR& surfaceCapabilities);
VkPresentModeKHR choosePresentMode(const std::vector<VkPresentModeKHR> presentModes);

VkInstance instance; //
VkSurfaceKHR windowSurface; //
VkPhysicalDevice physicalDevice;
VkDevice device; //
VkSemaphore imageAvailableSemaphore; //
VkSemaphore renderingFinishedSemaphore; //
VkSwapchainKHR swapChain; //
VkCommandPool commandPool; //
std::vector<VkCommandBuffer> presentCommandBuffers; //
std::vector<VkImage> swapChainImages; //
VkRenderPass renderPass; //
std::vector<VkFramebuffer> fbs; //
VkShaderModule sampleShaderModule; //
VkPipeline samplePipeline; //
VkQueue graphicsQueue;
VkQueue presentQueue;
VkBuffer triangleVertexBuffer;
VkDeviceMemory triangleVertexBufferMemory;
VkPhysicalDeviceMemoryProperties pdmp;
std::vector<VkImageView> views; //?
VkSurfaceFormatKHR swapchainFormat;
VkExtent2D swapChainExtent;
VkDescriptorPool descriptorPool;
VkDescriptorSet sampleDescriptorSet;
VkDescriptorSetLayout sampleDsl;
VkPipelineLayout samplePipelineLayout;
VkImage textureImage;
VkDeviceMemory textureMemory;
VkSampler textureSampler;
VkImageView textureView;

uint32_t graphicsQueueFamily;
uint32_t presentQueueFamily;

char* readPPM(const char* fileName)
{
	uint16_t ppm_magic;
	((uint8_t*)&ppm_magic)[0] = 'P';
	((uint8_t*)&ppm_magic)[1] = '6';

	FILE* fd = fopen(fileName, "rb");
	assert(fd);
	fseek (fd , 0 , SEEK_END);
	uint32_t fsize = ftell(fd);
	rewind(fd);
	char* buf = (char*)malloc(fsize);

	if(!buf)
	{
		return 0;
	}

	fread(buf, 1, fsize, fd);
	fclose(fd);

	uint16_t magic_number = ((uint16_t*)buf)[0];
	if(magic_number != ppm_magic)
	{
		fprintf(stderr, "PPM magic number not found: %u\n", magic_number);
		return 0;
	}

	char* widthStr = strtok(buf+3, " ");
	char* heightStr = strtok(0, "\n");
	char* maxValStr = strtok(0, "\n");
	int width = atoi(widthStr);
	int height = atoi(heightStr);
	int maxVal = atoi(maxValStr);

	printf("Image size: %i x %i\n", width, height);
	printf("Max value: %i\n", maxVal);

	char* imageBuf = maxValStr + strlen(maxValStr) + 1;

	//convert to BGRA (A=1)
	char* retBuf = (char*)malloc(width * height * 4);

	for(int y = 0; y < height; ++y)
		{
			for(int x = 0; x < width; ++x)
			{
				retBuf[(y*width+x)*4+0] = imageBuf[(y*width+x)*3+2];
				retBuf[(y*width+x)*4+1] = imageBuf[(y*width+x)*3+1];
				retBuf[(y*width+x)*4+2] = imageBuf[(y*width+x)*3+0];
				retBuf[(y*width+x)*4+3] = 0xff;
			}
		}

	free(buf);

	return retBuf;
}

void cleanup() {
	vkDeviceWaitIdle(device);

	// Note: this is done implicitly when the command pool is freed, but nice to know about
	vkFreeCommandBuffers(device, commandPool, presentCommandBuffers.size(), presentCommandBuffers.data());
	vkDestroyCommandPool(device, commandPool, nullptr);

	vkDestroySemaphore(device, imageAvailableSemaphore, nullptr);
	vkDestroySemaphore(device, renderingFinishedSemaphore, nullptr);

	for(int c = 0; c < views.size(); ++c)
		vkDestroyImageView(device, views[c], 0);

	for (int c = 0; c < fbs.size(); ++c)
		vkDestroyFramebuffer(device, fbs[c], 0);

	vkDestroyRenderPass(device, renderPass, 0);

	//vkDestroyShaderModule(device, shaderModule, 0);

	//vkDestroyPipeline(device, pipeline, 0);

	// Note: implicitly destroys images (in fact, we're not allowed to do that explicitly)
	vkDestroySwapchainKHR(device, swapChain, nullptr);

	vkDestroyDevice(device, nullptr);

	vkDestroySurfaceKHR(instance, windowSurface, nullptr);

	vkDestroyInstance(instance, nullptr);
}

void run() {
	// Note: dynamically loading loader may be a better idea to fail gracefully when Vulkan is not supported

	// Create window for Vulkan
	//glfwInit();

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

	//window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "The 630 line cornflower blue window", nullptr, nullptr);

	// Use Vulkan
	setupVulkan();

	mainLoop();

	cleanup();
}

void setupVulkan() {
	createInstance();
	findPhysicalDevice();
	createWindowSurface();
	checkSwapChainSupport();
	findQueueFamilies();
	createLogicalDevice();
	createSemaphores();
	createSwapChain();
	createCommandQueues();
	CreateRenderPass();
	CreateFramebuffer();
	CreateVertexBuffer();
	CreateShaders();
	CreateTexture();
	CreateDescriptorSet();
	CreatePipeline();
	recordCommandBuffers();
}

void mainLoop() {
	//while (!glfwWindowShouldClose(window)) {
	for(int c = 0; c < 300; ++c){
		draw();

		//glfwPollEvents();
	}
}

void createInstance() {
	VkApplicationInfo appInfo = {};
	appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
	appInfo.pApplicationName = "VulkanTriangle";
	appInfo.applicationVersion = VK_MAKE_VERSION(1, 0, 0);
	appInfo.pEngineName = "TriangleEngine";
	appInfo.engineVersion = VK_MAKE_VERSION(1, 0, 0);
	appInfo.apiVersion = VK_API_VERSION_1_0;

	// Get instance extensions required by GLFW to draw to window
	//unsigned int glfwExtensionCount;
	//const char** glfwExtensions;
	//glfwExtensions = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);

	// Check for extensions
	uint32_t extensionCount = 0;
	vkEnumerateInstanceExtensionProperties(nullptr, &extensionCount, nullptr);

	if (extensionCount == 0) {
		std::cerr << "no extensions supported!" << std::endl;
		assert(0);
	}

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

	std::cout << "supported extensions:" << std::endl;

	for (const auto& extension : availableExtensions) {
		std::cout << "\t" << extension.extensionName << std::endl;
	}

	const char* enabledExtensions[] = {
		"VK_KHR_surface",
			"VK_KHR_display"
	};

	VkInstanceCreateInfo createInfo = {};
	createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
	createInfo.pNext = 0;
	createInfo.pApplicationInfo = &appInfo;
	createInfo.enabledExtensionCount = sizeof(enabledExtensions) / sizeof(const char*);
	createInfo.ppEnabledExtensionNames = enabledExtensions;
	createInfo.enabledLayerCount = 0;
	createInfo.ppEnabledLayerNames = 0;

	// Initialize Vulkan instance
	if (vkCreateInstance(&createInfo, nullptr, &instance) != VK_SUCCESS) {
		std::cerr << "failed to create instance!" << std::endl;
		assert(0);
	}
	else {
		std::cout << "created vulkan instance" << std::endl;
	}
}

void createWindowSurface() {
	PFN_vkCreateRpiSurfaceEXT vkCreateRpiSurfaceEXT = 0;
	vkCreateRpiSurfaceEXT = (PFN_vkCreateRpiSurfaceEXT)vkGetInstanceProcAddr(instance, "vkCreateRpiSurfaceEXT");

	windowSurface = 0;

	LoaderTrampoline* trampoline = (LoaderTrampoline*)physicalDevice;
	VkRpiPhysicalDevice* realPhysicalDevice = trampoline->loaderTerminator->physicalDevice;

	VkRpiSurfaceCreateInfoEXT ci = {};
	ci.pSurface = &windowSurface;

	realPhysicalDevice->customData = (uintptr_t)&ci;

	if (vkCreateRpiSurfaceEXT(physicalDevice) != VK_SUCCESS) {
		std::cerr << "failed to create window surface!" << std::endl;
		assert(0);
	}

	std::cout << "created window surface" << std::endl;
}

void findPhysicalDevice() {
	// Try to find 1 Vulkan supported device
	// Note: perhaps refactor to loop through devices and find first one that supports all required features and extensions
	uint32_t deviceCount = 1;
	VkResult res = vkEnumeratePhysicalDevices(instance, &deviceCount, &physicalDevice);
	if (res != VK_SUCCESS && res != VK_INCOMPLETE) {
		std::cerr << "enumerating physical devices failed!" << std::endl;
		assert(0);
	}

	if (deviceCount == 0) {
		std::cerr << "no physical devices that support vulkan!" << std::endl;
		assert(0);
	}

	std::cout << "physical device with vulkan support found" << std::endl;

	vkGetPhysicalDeviceMemoryProperties(physicalDevice, &pdmp);

	// Check device features
	// Note: will apiVersion >= appInfo.apiVersion? Probably yes, but spec is unclear.
	VkPhysicalDeviceProperties deviceProperties;
	VkPhysicalDeviceFeatures deviceFeatures;
	vkGetPhysicalDeviceProperties(physicalDevice, &deviceProperties);
	vkGetPhysicalDeviceFeatures(physicalDevice, &deviceFeatures);

	uint32_t supportedVersion[] = {
		VK_VERSION_MAJOR(deviceProperties.apiVersion),
		VK_VERSION_MINOR(deviceProperties.apiVersion),
		VK_VERSION_PATCH(deviceProperties.apiVersion)
	};

	std::cout << "physical device supports version " << supportedVersion[0] << "." << supportedVersion[1] << "." << supportedVersion[2] << std::endl;
}

void checkSwapChainSupport() {
	uint32_t extensionCount = 0;
	vkEnumerateDeviceExtensionProperties(physicalDevice, nullptr, &extensionCount, nullptr);

	if (extensionCount == 0) {
		std::cerr << "physical device doesn't support any extensions" << std::endl;
		assert(0);
	}

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

	for (const auto& extension : deviceExtensions) {
		if (strcmp(extension.extensionName, VK_KHR_SWAPCHAIN_EXTENSION_NAME) == 0) {
			std::cout << "physical device supports swap chains" << std::endl;
			return;
		}
	}

	std::cerr << "physical device doesn't support swap chains" << std::endl;
	assert(0);
}

void findQueueFamilies() {
	// Check queue families
	uint32_t queueFamilyCount = 0;
	vkGetPhysicalDeviceQueueFamilyProperties(physicalDevice, &queueFamilyCount, nullptr);

	if (queueFamilyCount == 0) {
		std::cout << "physical device has no queue families!" << std::endl;
		assert(0);
	}

	// Find queue family with graphics support
	// Note: is a transfer queue necessary to copy vertices to the gpu or can a graphics queue handle that?
	std::vector<VkQueueFamilyProperties> queueFamilies(queueFamilyCount);
	vkGetPhysicalDeviceQueueFamilyProperties(physicalDevice, &queueFamilyCount, queueFamilies.data());

	std::cout << "physical device has " << queueFamilyCount << " queue families" << std::endl;

	bool foundGraphicsQueueFamily = false;
	bool foundPresentQueueFamily = false;

	for (uint32_t i = 0; i < queueFamilyCount; i++) {
		VkBool32 presentSupport = false;
		vkGetPhysicalDeviceSurfaceSupportKHR(physicalDevice, i, windowSurface, &presentSupport);

		if (queueFamilies[i].queueCount > 0 && queueFamilies[i].queueFlags & VK_QUEUE_GRAPHICS_BIT) {
			graphicsQueueFamily = i;
			foundGraphicsQueueFamily = true;

			if (presentSupport) {
				presentQueueFamily = i;
				foundPresentQueueFamily = true;
				break;
			}
		}

		if (!foundPresentQueueFamily && presentSupport) {
			presentQueueFamily = i;
			foundPresentQueueFamily = true;
		}
	}

	if (foundGraphicsQueueFamily) {
		std::cout << "queue family #" << graphicsQueueFamily << " supports graphics" << std::endl;

		if (foundPresentQueueFamily) {
			std::cout << "queue family #" << presentQueueFamily << " supports presentation" << std::endl;
		}
		else {
			std::cerr << "could not find a valid queue family with present support" << std::endl;
			assert(0);
		}
	}
	else {
		std::cerr << "could not find a valid queue family with graphics support" << std::endl;
		assert(0);
	}
}

void createLogicalDevice() {
	// Greate one graphics queue and optionally a separate presentation queue
	float queuePriority = 1.0f;

	VkDeviceQueueCreateInfo queueCreateInfo[2] = {};

	queueCreateInfo[0].sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO;
	queueCreateInfo[0].queueFamilyIndex = graphicsQueueFamily;
	queueCreateInfo[0].queueCount = 1;
	queueCreateInfo[0].pQueuePriorities = &queuePriority;

	queueCreateInfo[0].sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO;
	queueCreateInfo[0].queueFamilyIndex = presentQueueFamily;
	queueCreateInfo[0].queueCount = 1;
	queueCreateInfo[0].pQueuePriorities = &queuePriority;

	// Create logical device from physical device
	// Note: there are separate instance and device extensions!
	VkDeviceCreateInfo deviceCreateInfo = {};
	deviceCreateInfo.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO;
	deviceCreateInfo.pQueueCreateInfos = queueCreateInfo;

	if (graphicsQueueFamily == presentQueueFamily) {
		deviceCreateInfo.queueCreateInfoCount = 1;
	}
	else {
		deviceCreateInfo.queueCreateInfoCount = 2;
	}

	const char* deviceExtensions = VK_KHR_SWAPCHAIN_EXTENSION_NAME;
	deviceCreateInfo.enabledExtensionCount = 1;
	deviceCreateInfo.ppEnabledExtensionNames = &deviceExtensions;

	if (vkCreateDevice(physicalDevice, &deviceCreateInfo, nullptr, &device) != VK_SUCCESS) {
		std::cerr << "failed to create logical device" << std::endl;
		assert(0);
	}

	std::cout << "created logical device" << std::endl;

	// Get graphics and presentation queues (which may be the same)
	vkGetDeviceQueue(device, graphicsQueueFamily, 0, &graphicsQueue);
	vkGetDeviceQueue(device, presentQueueFamily, 0, &presentQueue);

	std::cout << "acquired graphics and presentation queues" << std::endl;
}

void createSemaphores() {
	VkSemaphoreCreateInfo createInfo = {};
	createInfo.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;

	if (vkCreateSemaphore(device, &createInfo, nullptr, &imageAvailableSemaphore) != VK_SUCCESS ||
		vkCreateSemaphore(device, &createInfo, nullptr, &renderingFinishedSemaphore) != VK_SUCCESS) {
		std::cerr << "failed to create semaphores" << std::endl;
		assert(0);
	}
	else {
		std::cout << "created semaphores" << std::endl;
	}
}

void createSwapChain() {
	// Find surface capabilities
	VkSurfaceCapabilitiesKHR surfaceCapabilities;
	if (vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physicalDevice, windowSurface, &surfaceCapabilities) != VK_SUCCESS) {
		std::cerr << "failed to acquire presentation surface capabilities" << std::endl;
		assert(0);
	}

	// Find supported surface formats
	uint32_t formatCount;
	if (vkGetPhysicalDeviceSurfaceFormatsKHR(physicalDevice, windowSurface, &formatCount, nullptr) != VK_SUCCESS || formatCount == 0) {
		std::cerr << "failed to get number of supported surface formats" << std::endl;
		assert(0);
	}

	std::vector<VkSurfaceFormatKHR> surfaceFormats(formatCount);
	if (vkGetPhysicalDeviceSurfaceFormatsKHR(physicalDevice, windowSurface, &formatCount, surfaceFormats.data()) != VK_SUCCESS) {
		std::cerr << "failed to get supported surface formats" << std::endl;
		assert(0);
	}

	// Find supported present modes
	uint32_t presentModeCount;
	if (vkGetPhysicalDeviceSurfacePresentModesKHR(physicalDevice, windowSurface, &presentModeCount, nullptr) != VK_SUCCESS || presentModeCount == 0) {
		std::cerr << "failed to get number of supported presentation modes" << std::endl;
		assert(0);
	}

	std::vector<VkPresentModeKHR> presentModes(presentModeCount);
	if (vkGetPhysicalDeviceSurfacePresentModesKHR(physicalDevice, windowSurface, &presentModeCount, presentModes.data()) != VK_SUCCESS) {
		std::cerr << "failed to get supported presentation modes" << std::endl;
		assert(0);
	}

	// Determine number of images for swap chain
	uint32_t imageCount = surfaceCapabilities.minImageCount + 1;
	if (surfaceCapabilities.maxImageCount != 0 && imageCount > surfaceCapabilities.maxImageCount) {
		imageCount = surfaceCapabilities.maxImageCount;
	}

	std::cout << "using " << imageCount << " images for swap chain" << std::endl;

	// Select a surface format
	swapchainFormat = chooseSurfaceFormat(surfaceFormats);

	// Select swap chain size
	swapChainExtent = chooseSwapExtent(surfaceCapabilities);

	// Check if swap chain supports being the destination of an image transfer
	// Note: AMD driver bug, though it would be nice to implement a workaround that doesn't use transfering
	//if (!(surfaceCapabilities.supportedUsageFlags & VK_IMAGE_USAGE_TRANSFER_DST_BIT)) {
	//	std::cerr << "swap chain image does not support VK_IMAGE_TRANSFER_DST usage" << std::endl;
		//assert(0);
	//}

	// Determine transformation to use (preferring no transform)
	VkSurfaceTransformFlagBitsKHR surfaceTransform;
	if (surfaceCapabilities.supportedTransforms & VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR) {
		surfaceTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
	}
	else {
		surfaceTransform = surfaceCapabilities.currentTransform;
	}

	// Choose presentation mode (preferring MAILBOX ~= triple buffering)
	VkPresentModeKHR presentMode = choosePresentMode(presentModes);

	// Finally, create the swap chain
	VkSwapchainCreateInfoKHR createInfo = {};
	createInfo.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
	createInfo.surface = windowSurface;
	createInfo.minImageCount = imageCount;
	createInfo.imageFormat = swapchainFormat.format;
	createInfo.imageColorSpace = swapchainFormat.colorSpace;
	createInfo.imageExtent = swapChainExtent;
	createInfo.imageArrayLayers = 1;
	createInfo.imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
	createInfo.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
	createInfo.queueFamilyIndexCount = 0;
	createInfo.pQueueFamilyIndices = nullptr;
	createInfo.preTransform = surfaceTransform;
	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) {
		std::cerr << "failed to create swap chain" << std::endl;
		assert(0);
	}
	else {
		std::cout << "created swap chain" << std::endl;
	}

	// Store the images used by the swap chain
	// Note: these are the images that swap chain image indices refer to
	// Note: actual number of images may differ from requested number, since it's a lower bound
	uint32_t actualImageCount = 0;
	if (vkGetSwapchainImagesKHR(device, swapChain, &actualImageCount, nullptr) != VK_SUCCESS || actualImageCount == 0) {
		std::cerr << "failed to acquire number of swap chain images" << std::endl;
		assert(0);
	}

	swapChainImages.resize(actualImageCount);
	views.resize(actualImageCount);

	if (vkGetSwapchainImagesKHR(device, swapChain, &actualImageCount, swapChainImages.data()) != VK_SUCCESS) {
		std::cerr << "failed to acquire swap chain images" << std::endl;
		assert(0);
	}

	std::cout << "acquired swap chain images" << std::endl;
}

VkSurfaceFormatKHR chooseSurfaceFormat(const std::vector<VkSurfaceFormatKHR>& availableFormats) {
	// We can either choose any format
	if (availableFormats.size() == 1 && availableFormats[0].format == VK_FORMAT_UNDEFINED) {
		return { VK_FORMAT_R8G8B8A8_UNORM, VK_COLORSPACE_SRGB_NONLINEAR_KHR };
	}

	// Or go with the standard format - if available
	for (const auto& availableSurfaceFormat : availableFormats) {
		if (availableSurfaceFormat.format == VK_FORMAT_R8G8B8A8_UNORM) {
			return availableSurfaceFormat;
		}
	}

	// Or fall back to the first available one
	return availableFormats[0];
}

VkExtent2D chooseSwapExtent(const VkSurfaceCapabilitiesKHR& surfaceCapabilities) {
	if (surfaceCapabilities.currentExtent.width == -1) {
		VkExtent2D swapChainExtent = {};

#define min(a, b) (a < b ? a : b)
#define max(a, b) (a > b ? a : b)
		swapChainExtent.width = min(max(640, surfaceCapabilities.minImageExtent.width), surfaceCapabilities.maxImageExtent.width);
		swapChainExtent.height = min(max(480, surfaceCapabilities.minImageExtent.height), surfaceCapabilities.maxImageExtent.height);

		return swapChainExtent;
	}
	else {
		return surfaceCapabilities.currentExtent;
	}
}

VkPresentModeKHR choosePresentMode(const std::vector<VkPresentModeKHR> presentModes) {
	for (const auto& presentMode : presentModes) {
		if (presentMode == VK_PRESENT_MODE_MAILBOX_KHR) {
			return presentMode;
		}
	}

	// If mailbox is unavailable, fall back to FIFO (guaranteed to be available)
	return VK_PRESENT_MODE_FIFO_KHR;
}

void createCommandQueues() {
	// Create presentation command pool
	// Note: only command buffers for a single queue family can be created from this pool
	VkCommandPoolCreateInfo poolCreateInfo = {};
	poolCreateInfo.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
	poolCreateInfo.queueFamilyIndex = presentQueueFamily;

	if (vkCreateCommandPool(device, &poolCreateInfo, nullptr, &commandPool) != VK_SUCCESS) {
		std::cerr << "failed to create command queue for presentation queue family" << std::endl;
		assert(0);
	}
	else {
		std::cout << "created command pool for presentation queue family" << std::endl;
	}

	// Get number of swap chain images and create vector to hold command queue for each one
	presentCommandBuffers.resize(swapChainImages.size());

	// Allocate presentation command buffers
	// Note: secondary command buffers are only for nesting in primary command buffers
	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)swapChainImages.size();

	if (vkAllocateCommandBuffers(device, &allocInfo, presentCommandBuffers.data()) != VK_SUCCESS) {
		std::cerr << "failed to allocate presentation command buffers" << std::endl;
		assert(0);
	}
	else {
		std::cout << "allocated presentation command buffers" << std::endl;
	}
}

void recordCommandBuffers()
{
	// Prepare data for recording command buffers
	VkCommandBufferBeginInfo beginInfo = {};
	beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
	beginInfo.flags = VK_COMMAND_BUFFER_USAGE_SIMULTANEOUS_USE_BIT;

	// Note: contains value for each subresource range
	VkClearColorValue clearColor = {
		{ 0.4f, 0.6f, 0.9f, 1.0f } // R, G, B, A
	};
	VkClearValue clearValue = {};
	clearValue.color = clearColor;

	VkImageSubresourceRange subResourceRange = {};
	subResourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
	subResourceRange.baseMipLevel = 0;
	subResourceRange.levelCount = 1;
	subResourceRange.baseArrayLayer = 0;
	subResourceRange.layerCount = 1;

	VkRenderPassBeginInfo renderPassInfo = {};
	renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
	renderPassInfo.renderPass = renderPass;
	renderPassInfo.renderArea.offset.x = 0;
	renderPassInfo.renderArea.offset.y = 0;
	renderPassInfo.renderArea.extent.width = swapChainExtent.width;
	renderPassInfo.renderArea.extent.height = swapChainExtent.height;
	renderPassInfo.clearValueCount = 1;
	renderPassInfo.pClearValues = &clearValue;

	VkViewport viewport = { 0 };
	viewport.height = (float)swapChainExtent.width;
	viewport.width = (float)swapChainExtent.height;
	viewport.minDepth = (float)0.0f;
	viewport.maxDepth = (float)1.0f;

	VkRect2D scissor = { 0 };
	scissor.extent.width = swapChainExtent.width;
	scissor.extent.height = swapChainExtent.height;
	scissor.offset.x = 0;
	scissor.offset.y = 0;

	// Record the command buffer for every swap chain image
	for (uint32_t i = 0; i < swapChainImages.size(); i++) {
		// Record command buffer
		vkBeginCommandBuffer(presentCommandBuffers[i], &beginInfo);

		{ //render to screen
			renderPassInfo.framebuffer = fbs[i];
			renderPassInfo.renderPass = renderPass;
			renderPassInfo.clearValueCount = 1;
			renderPassInfo.pClearValues = &clearValue;

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

			vkCmdBindPipeline(presentCommandBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, samplePipeline);

			VkDeviceSize offsets = 0;
			vkCmdBindVertexBuffers(presentCommandBuffers[i], 0, 1, &triangleVertexBuffer, &offsets );

			vkCmdBindDescriptorSets(presentCommandBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, samplePipelineLayout, 0, 1, &sampleDescriptorSet, 0, 0);

			float Wcoeff = 1.0f; //1.0f / Wc = 2.0 - Wcoeff
			float viewportScaleX = (float)(swapChainExtent.width) * 0.5f * 16.0f;
			float viewportScaleY = -1.0f * (float)(swapChainExtent.height) * 0.5f * 16.0f;
			float Zs = 0.5f;

			uint32_t pushConstants[4];
			pushConstants[0] = *(uint32_t*)&Wcoeff;
			pushConstants[1] = *(uint32_t*)&viewportScaleX;
			pushConstants[2] = *(uint32_t*)&viewportScaleY;
			pushConstants[3] = *(uint32_t*)&Zs;

			vkCmdPushConstants(presentCommandBuffers[i], samplePipelineLayout, VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(pushConstants), &pushConstants);

			vkCmdDraw(presentCommandBuffers[i], 3, 1, 0, 0);

			vkCmdEndRenderPass(presentCommandBuffers[i]);
		}

		if (vkEndCommandBuffer(presentCommandBuffers[i]) != VK_SUCCESS) {
			std::cerr << "failed to record command buffer" << std::endl;
			assert(0);
		}
		else {
			std::cout << "recorded command buffer for image " << i << std::endl;
		}
	}
}

void draw() {
	// Acquire image
	uint32_t imageIndex;
	VkResult res = vkAcquireNextImageKHR(device, swapChain, UINT64_MAX, imageAvailableSemaphore, VK_NULL_HANDLE, &imageIndex);

	if (res != VK_SUCCESS && res != VK_SUBOPTIMAL_KHR) {
		std::cerr << "failed to acquire image" << std::endl;
		assert(0);
	}

	std::cout << "acquired image" << std::endl;

	// Wait for image to be available and draw
	VkSubmitInfo submitInfo = {};
	submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;

	submitInfo.waitSemaphoreCount = 1;
	submitInfo.pWaitSemaphores = &imageAvailableSemaphore;

	submitInfo.signalSemaphoreCount = 1;
	submitInfo.pSignalSemaphores = &renderingFinishedSemaphore;

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

	if (vkQueueSubmit(presentQueue, 1, &submitInfo, VK_NULL_HANDLE) != VK_SUCCESS) {
		std::cerr << "failed to submit draw command buffer" << std::endl;
		assert(0);
	}

	std::cout << "submitted draw command buffer" << std::endl;

	// Present drawn image
	// Note: semaphore here is not strictly necessary, because commands are processed in submission order within a single queue
	VkPresentInfoKHR presentInfo = {};
	presentInfo.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR;
	presentInfo.waitSemaphoreCount = 1;
	presentInfo.pWaitSemaphores = &renderingFinishedSemaphore;

	presentInfo.swapchainCount = 1;
	presentInfo.pSwapchains = &swapChain;
	presentInfo.pImageIndices = &imageIndex;

	res = vkQueuePresentKHR(presentQueue, &presentInfo);

	if (res != VK_SUCCESS) {
		std::cerr << "failed to submit present command buffer" << std::endl;
		assert(0);
	}

	std::cout << "submitted presentation command buffer" << std::endl;
}

void CreateRenderPass()
{
	VkAttachmentReference attachRef = {};
	attachRef.attachment = 0;
	attachRef.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;

	VkSubpassDescription subpassDesc = {};
	subpassDesc.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
	subpassDesc.colorAttachmentCount = 1;
	subpassDesc.pColorAttachments = &attachRef;

	VkAttachmentDescription attachDesc = {};
	attachDesc.format = swapchainFormat.format; //Todo
	attachDesc.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
	attachDesc.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
	attachDesc.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
	attachDesc.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
	attachDesc.initialLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;
	attachDesc.finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;
	attachDesc.samples = VK_SAMPLE_COUNT_1_BIT;

	VkRenderPassCreateInfo renderPassCreateInfo = {};
	renderPassCreateInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
	renderPassCreateInfo.attachmentCount = 1;
	renderPassCreateInfo.pAttachments = &attachDesc;
	renderPassCreateInfo.subpassCount = 1;
	renderPassCreateInfo.pSubpasses = &subpassDesc;

	VkResult res = vkCreateRenderPass(device, &renderPassCreateInfo, NULL, &renderPass);

	printf("Created a render pass\n");
}


void CreateFramebuffer()
{
	fbs.resize(swapChainImages.size());

	VkResult res;

	for (uint32_t i = 0; i < swapChainImages.size(); i++) {
		VkImageViewCreateInfo ViewCreateInfo = {};
		ViewCreateInfo.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
		ViewCreateInfo.image = swapChainImages[i];
		ViewCreateInfo.format = swapchainFormat.format; //Todo
		ViewCreateInfo.viewType = VK_IMAGE_VIEW_TYPE_2D;
		ViewCreateInfo.components.r = VK_COMPONENT_SWIZZLE_IDENTITY;
		ViewCreateInfo.components.g = VK_COMPONENT_SWIZZLE_IDENTITY;
		ViewCreateInfo.components.b = VK_COMPONENT_SWIZZLE_IDENTITY;
		ViewCreateInfo.components.a = VK_COMPONENT_SWIZZLE_IDENTITY;
		ViewCreateInfo.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
		ViewCreateInfo.subresourceRange.baseMipLevel = 0;
		ViewCreateInfo.subresourceRange.levelCount = 1;
		ViewCreateInfo.subresourceRange.baseArrayLayer = 0;
		ViewCreateInfo.subresourceRange.layerCount = 1;

		res = vkCreateImageView(device, &ViewCreateInfo, NULL, &views[i]);

		VkFramebufferCreateInfo fbCreateInfo = {};
		fbCreateInfo.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
		fbCreateInfo.renderPass = renderPass;
		fbCreateInfo.attachmentCount = 1;
		fbCreateInfo.pAttachments = &views[i];
		fbCreateInfo.width = swapChainExtent.width;
		fbCreateInfo.height = swapChainExtent.height;
		fbCreateInfo.layers = 1;

		res = vkCreateFramebuffer(device, &fbCreateInfo, NULL, &fbs[i]);
	}

	printf("Frame buffers created\n");
}

void CreateShaders()
{
	char vs_asm_code[] =
			///0x40000000 = 2.0
			///uni = 1.0
			///rb0 = 2 - 1 = 1
			"sig_small_imm ; rx0 = fsub.ws.always(b, a, uni, 0x40000000) ; nop = nop(r0, r0) ;\n"
			///set up VPM read for subsequent reads
			///0x00201a00: 0000 0000 0010 0000 0001 1010 0000 0000
			///addr: 0
			///size: 32bit
			///packed
			///horizontal
			///stride=1
			///vectors to read = 2 (how many components)
			"sig_load_imm ; vr_setup = load32.always(0x00201a00) ; nop = load32.always() ;\n"
			///uni = viewportXScale
			///r0 = vpm * uni
			"sig_none ; nop = nop(r0, r0, vpm_read, uni) ; r0 = fmul.always(a, b) ;\n"
			///r1 = r0 * rb0 (1)
			"sig_none ; nop = nop(r0, r0, nop, rb0) ; r1 = fmul.always(r0, b) ;\n"
			///uni = viewportYScale
			///ra0.16a = int(r1), r2 = vpm * uni
			"sig_none ; rx0.16a = ftoi.always(r1, r1, vpm_read, uni) ; r2 = fmul.always(a, b) ;\n"
			///r3 = r2 * rb0
			"sig_none ; nop = nop(r0, r0, nop, rb0) ; r3 = fmul.always(r2, b) ;\n"
			///ra0.16b = int(r3)
			"sig_none ; rx0.16b = ftoi.always(r3, r3) ; nop = nop(r0, r0) ;\n"
			///set up VPM write for subsequent writes
			///0x00001a00: 0000 0000 0000 0000 0001 1010 0000 0000
			///addr: 0
			///size: 32bit
			///horizontal
			///stride = 1
			"sig_load_imm ; vw_setup = load32.always.ws(0x00001a00) ; nop = load32.always() ;\n"
			///shaded vertex format for PSE
			/// Ys and Xs
			///vpm = ra0
			"sig_none ; vpm = or.always(a, a, ra0, nop) ; nop = nop(r0, r0);\n"
			/// Zs
			///uni = 0.5
			///vpm = uni
			"sig_none ; vpm = or.always(a, a, uni, nop) ; nop = nop(r0, r0);\n"
			/// 1.0 / Wc
			///vpm = rb0 (1)
			"sig_none ; vpm = or.always(b, b, nop, rb0) ; nop = nop(r0, r0);\n"
			///END
			"sig_end ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;\n"
			"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;\n"
			"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;\n"
				"\0";

	char cs_asm_code[] =
			///uni = 1.0
			///r3 = 2.0 - uni
			"sig_small_imm ; r3 = fsub.always(b, a, uni, 0x40000000) ; nop = nop(r0, r0);\n"
			"sig_load_imm ; vr_setup = load32.always(0x00201a00) ; nop = load32.always() ;\n"
			///r2 = vpm
			"sig_none ; r2 = or.always(a, a, vpm_read, nop) ; nop = nop(r0, r0);\n"
			"sig_load_imm ; vw_setup = load32.always.ws(0x00001a00) ; nop = load32.always() ;\n"
			///shaded coordinates format for PTB
			/// write Xc
			///r1 = vpm, vpm = r2
			"sig_none ; r1 = or.always(a, a, vpm_read, nop) ; vpm = v8min.always(r2, r2);\n"
			/// write Yc
			///uni = viewportXscale
			///vpm = r1, r2 = r2 * uni
			"sig_none ; vpm = or.always(r1, r1, uni, nop) ; r2 = fmul.always(r2, a);\n"
			///uni = viewportYscale
			///r1 = r1 * uni
			"sig_none ; nop = nop(r0, r0, uni, nop) ; r1 = fmul.always(r1, a);\n"
			///r0 = r2 * r3
			"sig_none ; nop = nop(r0, r0) ; r0 = fmul.always(r2, r3);\n"
			///ra0.16a = r0, r1 = r1 * r3
			"sig_none ; rx0.16a = ftoi.always(r0, r0) ; r1 = fmul.always(r1, r3) ;\n"
			///ra0.16b = r1
			"sig_none ; rx0.16b = ftoi.always(r1, r1) ; nop = nop(r0, r0) ;\n"
			///write Zc
			///vpm = 0
			"sig_small_imm ; vpm = or.always(b, b, nop, 0) ; nop = nop(r0, r0) ;\n"
			///write Wc
			///vpm = 1.0
			"sig_small_imm ; vpm = or.always(b, b, nop, 0x3f800000) ; nop = nop(r0, r0) ;\n"
			///write Ys and Xs
			///vpm = ra0
			"sig_none ; vpm = or.always(a, a, ra0, nop) ; nop = nop(r0, r0) ;\n"
			///write Zs
			///uni = 0.5
			///vpm = uni
			"sig_none ; vpm = or.always(a, a, uni, nop) ; nop = nop(r0, r0) ;\n"
			///write 1/Wc
			///vpm = r3
			"sig_none ; vpm = or.always(r3, r3) ; nop = nop(r0, r0) ;\n"
			///END
			"sig_end ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;\n"
			"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;\n"
			"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;\n"
				"\0";

	//clever: use small immedate -1 interpreted as 0xffffffff (white) to set color to white
	//"sig_small_imm ; tlb_color_all = or.always(b, b, nop, -1) ; nop = nop(r0, r0) ;"

	//8bit access
	//abcd
	//BGRA

	//sample texture
	char sample_fs_asm_code[] =
			"sig_none ; r0 = itof.always(b, b, x_pix, y_pix) ; nop = nop(r0, r0) ;"
			"sig_load_imm ; r2 = load32.always(0x3a72b9d6) ; nop = load32() ;" //1/1080
			"sig_none ; r0 = itof.always(a, a, x_pix, y_pix) ; r1 = fmul.always(r2, r0); ;" //r1 contains tex coord y
			"sig_load_imm ; r2 = load32.always(0x3a088888) ; nop = load32() ;" //1/1920
			///write texture addresses (x, y)
			///writing tmu0_s signals that all coordinates are written
			"sig_none ; tmu0_t = or.always(r1, r1) ; r0 = fmul.always(r2, r0) ;" //r0 contains tex coord x
			"sig_none ; tmu0_s = or.always(r0, r0) ; nop = nop(r0, r0) ;"
			///suspend thread (after 2 nops) to wait for TMU request to finish
			"sig_thread_switch ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;"
			"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;"
			"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;"
			///read TMU0 request result to R4
			"sig_load_tmu0 ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;"
			///when thread has been awakened, MOV from R4 to R0
			"sig_none ; r0 = fmax.pm.always.8a(r4, r4) ; nop = nop(r0, r0) ;"
			"sig_none ; r1 = fmax.pm.always.8b(r4, r4) ; r0.8a = v8min.always(r0, r0) ;"
			"sig_none ; r2 = fmax.pm.always.8c(r4, r4) ; r0.8b = v8min.always(r1, r1) ;"
			"sig_none ; r3 = fmax.pm.always.8d(r4, r4) ; r0.8c = v8min.always(r2, r2) ;"
			"sig_none ; nop = nop.pm(r0, r0) ; r0.8d = v8min.always(r3, r3) ;"
			"sig_none ; tlb_color_all = or.always(r0, r0) ; nop = nop(r0, r0) ;"
			"sig_end ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;"
			"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;"
			"sig_unlock_score ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;"
				"\0";

	char* sample_asm_strings[] =
	{
		(char*)cs_asm_code, (char*)vs_asm_code, (char*)sample_fs_asm_code, 0
	};

	VkRpiAssemblyMappingEXT sample_mappings[] = {
		//vertex shader uniforms
		{
			VK_RPI_ASSEMBLY_MAPPING_TYPE_PUSH_CONSTANT,
			VK_DESCRIPTOR_TYPE_MAX_ENUM, //descriptor type
			0, //descriptor set #
			0, //descriptor binding #
			0, //descriptor array element #
			0, //resource offset
			VK_SHADER_STAGE_VERTEX_BIT
		},
		{
			VK_RPI_ASSEMBLY_MAPPING_TYPE_PUSH_CONSTANT,
			VK_DESCRIPTOR_TYPE_MAX_ENUM, //descriptor type
			0, //descriptor set #
			0, //descriptor binding #
			0, //descriptor array element #
			4, //resource offset
			VK_SHADER_STAGE_VERTEX_BIT
		},
		{
			VK_RPI_ASSEMBLY_MAPPING_TYPE_PUSH_CONSTANT,
			VK_DESCRIPTOR_TYPE_MAX_ENUM, //descriptor type
			0, //descriptor set #
			0, //descriptor binding #
			0, //descriptor array element #
			8, //resource offset
			VK_SHADER_STAGE_VERTEX_BIT
		},
		{
			VK_RPI_ASSEMBLY_MAPPING_TYPE_PUSH_CONSTANT,
			VK_DESCRIPTOR_TYPE_MAX_ENUM, //descriptor type
			0, //descriptor set #
			0, //descriptor binding #
			0, //descriptor array element #
			12, //resource offset
			VK_SHADER_STAGE_VERTEX_BIT
		},
		//fragment shader uniforms
		{
			VK_RPI_ASSEMBLY_MAPPING_TYPE_DESCRIPTOR,
			VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, //descriptor type
			0, //descriptor set #
			0, //descriptor binding #
			0, //descriptor array element #
			0, //resource offset
			VK_SHADER_STAGE_FRAGMENT_BIT
		}
	};

	VkRpiShaderModuleAssemblyCreateInfoEXT shaderModuleCreateInfo = {};
	shaderModuleCreateInfo.asmStrings = sample_asm_strings;
	shaderModuleCreateInfo.mappings = sample_mappings;
	shaderModuleCreateInfo.numMappings = sizeof(sample_mappings) / sizeof(VkRpiAssemblyMappingEXT);
	shaderModuleCreateInfo.pShaderModule = &sampleShaderModule;

	LoaderTrampoline* trampoline = (LoaderTrampoline*)physicalDevice;
	VkRpiPhysicalDevice* realPhysicalDevice = trampoline->loaderTerminator->physicalDevice;

	realPhysicalDevice->customData = (uintptr_t)&shaderModuleCreateInfo;

	PFN_vkCreateShaderModuleFromRpiAssemblyEXT vkCreateShaderModuleFromRpiAssemblyEXT = (PFN_vkCreateShaderModuleFromRpiAssemblyEXT)vkGetInstanceProcAddr(instance, "vkCreateShaderModuleFromRpiAssemblyEXT");

	VkResult res = vkCreateShaderModuleFromRpiAssemblyEXT(physicalDevice);
	assert(sampleShaderModule);

	//exit(-1);
}


#define VERTEX_BUFFER_BIND_ID 0

void CreatePipeline()
{
	VkVertexInputBindingDescription vertexInputBindingDescription =
	{
		0,
		sizeof(float) * 2,
		VK_VERTEX_INPUT_RATE_VERTEX
	};

	VkVertexInputAttributeDescription vertexInputAttributeDescription =
	{
		0,
		0,
		VK_FORMAT_R32G32_SFLOAT,
		0
	};

	VkPipelineVertexInputStateCreateInfo vertexInputInfo = {};
	vertexInputInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
	vertexInputInfo.vertexAttributeDescriptionCount = 1;
	vertexInputInfo.pVertexAttributeDescriptions = &vertexInputAttributeDescription;
	vertexInputInfo.vertexBindingDescriptionCount = 1;
	vertexInputInfo.pVertexBindingDescriptions = &vertexInputBindingDescription;

	VkPipelineInputAssemblyStateCreateInfo pipelineIACreateInfo = {};
	pipelineIACreateInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO;
	pipelineIACreateInfo.topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;

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

	VkPipelineViewportStateCreateInfo vpCreateInfo = {};
	vpCreateInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO;
	vpCreateInfo.viewportCount = 1;
	vpCreateInfo.pViewports = &vp;

	VkPipelineRasterizationStateCreateInfo rastCreateInfo = {};
	rastCreateInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO;
	rastCreateInfo.polygonMode = VK_POLYGON_MODE_FILL;
	rastCreateInfo.cullMode = VK_CULL_MODE_NONE;
	rastCreateInfo.frontFace = VK_FRONT_FACE_COUNTER_CLOCKWISE;
	rastCreateInfo.lineWidth = 1.0f;

	VkPipelineMultisampleStateCreateInfo pipelineMSCreateInfo = {};
	pipelineMSCreateInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;

	VkPipelineColorBlendAttachmentState blendAttachState = {};
	blendAttachState.colorWriteMask = 0xf;
	blendAttachState.blendEnable = false;

	VkPipelineColorBlendStateCreateInfo blendCreateInfo = {};
	blendCreateInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;
	blendCreateInfo.attachmentCount = 1;
	blendCreateInfo.pAttachments = &blendAttachState;

	VkPipelineDepthStencilStateCreateInfo depthStencilState = {};
	depthStencilState.depthTestEnable = false;
	depthStencilState.stencilTestEnable = false;

	{ //create sample pipeline
		VkPushConstantRange pushConstantRanges[2];
		pushConstantRanges[0].offset = 0;
		pushConstantRanges[0].size = 4 * 4; //4 * 32bits
		pushConstantRanges[0].stageFlags = VK_SHADER_STAGE_VERTEX_BIT;

		pushConstantRanges[1].offset = 0;
		pushConstantRanges[1].size = 1 * 4; //1 * 32bits
		pushConstantRanges[1].stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT;

		VkPipelineShaderStageCreateInfo shaderStageCreateInfo[2] = {};

		shaderStageCreateInfo[0].sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
		shaderStageCreateInfo[0].stage = VK_SHADER_STAGE_VERTEX_BIT;
		shaderStageCreateInfo[0].module = sampleShaderModule;
		shaderStageCreateInfo[0].pName = "main";
		shaderStageCreateInfo[1].sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
		shaderStageCreateInfo[1].stage = VK_SHADER_STAGE_FRAGMENT_BIT;
		shaderStageCreateInfo[1].module = sampleShaderModule;
		shaderStageCreateInfo[1].pName = "main";

		VkPipelineLayoutCreateInfo pipelineLayoutCI = {};
		pipelineLayoutCI.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
		pipelineLayoutCI.setLayoutCount = 1;
		pipelineLayoutCI.pSetLayouts = &sampleDsl;
		pipelineLayoutCI.pushConstantRangeCount = 2;
		pipelineLayoutCI.pPushConstantRanges = &pushConstantRanges[0];
		vkCreatePipelineLayout(device, &pipelineLayoutCI, 0, &samplePipelineLayout);

		VkGraphicsPipelineCreateInfo pipelineInfo = {};
		pipelineInfo.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
		pipelineInfo.stageCount = 2;
		pipelineInfo.pStages = &shaderStageCreateInfo[0];
		pipelineInfo.pVertexInputState = &vertexInputInfo;
		pipelineInfo.pInputAssemblyState = &pipelineIACreateInfo;
		pipelineInfo.pViewportState = &vpCreateInfo;
		pipelineInfo.pRasterizationState = &rastCreateInfo;
		pipelineInfo.pMultisampleState = &pipelineMSCreateInfo;
		pipelineInfo.pColorBlendState = &blendCreateInfo;
		pipelineInfo.renderPass = renderPass;
		pipelineInfo.basePipelineIndex = -1;
		pipelineInfo.pDepthStencilState = &depthStencilState;
		pipelineInfo.layout = samplePipelineLayout;

		VkResult res = vkCreateGraphicsPipelines(device, VK_NULL_HANDLE, 1, &pipelineInfo, NULL, &samplePipeline);
	}

	printf("Graphics pipeline created\n");
}

uint32_t getMemoryTypeIndex(VkPhysicalDeviceMemoryProperties deviceMemoryProperties, uint32_t typeBits, VkMemoryPropertyFlags properties)
{
	// Iterate over all memory types available for the device used in this example
	for (uint32_t i = 0; i < deviceMemoryProperties.memoryTypeCount; i++)
	{
		if ((typeBits & 1) == 1)
		{
			if ((deviceMemoryProperties.memoryTypes[i].propertyFlags & properties) == properties)
			{
				return i;
			}
		}
		typeBits >>= 1;
	}

	assert(0);
}

void CreateTexture()
{
	VkFormat format = VK_FORMAT_R8G8B8A8_UNORM;

	uint32_t width = swapChainExtent.width, height = swapChainExtent.height;
	uint32_t mipLevels = 1;

	char* texData = readPPM("image.ppm");
	//char* texData = readPPM("triangle.ppm");

	VkBuffer stagingBuffer;
	VkDeviceMemory stagingMemory;

	{ //create storage texel buffer for generic mem address TMU ops test
		VkBufferCreateInfo bufferCreateInfo = {};
		bufferCreateInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
		bufferCreateInfo.size = width * height * 4;
		bufferCreateInfo.usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT;
		bufferCreateInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
		vkCreateBuffer(device, &bufferCreateInfo, 0, &stagingBuffer);

		VkMemoryRequirements mr;
		vkGetBufferMemoryRequirements(device, stagingBuffer, &mr);

		VkMemoryAllocateInfo mai = {};
		mai.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
		mai.allocationSize = mr.size;
		mai.memoryTypeIndex = getMemoryTypeIndex(pdmp, mr.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);

		vkAllocateMemory(device, &mai, 0, &stagingMemory);

		void* data;
		vkMapMemory(device, stagingMemory, 0, mr.size, 0, &data);
		memcpy(data, texData, width * height * 4);
		vkUnmapMemory(device, stagingMemory);

		free(texData);

		vkBindBufferMemory(device, stagingBuffer, stagingMemory, 0);
	}

	{ //create texture that we'll write to		
		VkImageCreateInfo imageCreateInfo = {};
		imageCreateInfo.sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO;
		imageCreateInfo.imageType = VK_IMAGE_TYPE_2D;
		imageCreateInfo.format = format;
		imageCreateInfo.mipLevels = mipLevels;
		imageCreateInfo.arrayLayers = 1;
		imageCreateInfo.samples = VK_SAMPLE_COUNT_1_BIT;
		imageCreateInfo.tiling = VK_IMAGE_TILING_OPTIMAL;
		imageCreateInfo.usage = VK_IMAGE_USAGE_SAMPLED_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT;
		imageCreateInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
		imageCreateInfo.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
		imageCreateInfo.extent = { width, height, 1 };
		vkCreateImage(device, &imageCreateInfo, 0, &textureImage);

		VkMemoryRequirements mr;
		vkGetImageMemoryRequirements(device, textureImage, &mr);

		VkMemoryAllocateInfo mai = {};
		mai.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
		mai.allocationSize = mr.size;
		mai.memoryTypeIndex = getMemoryTypeIndex(pdmp, mr.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);

		vkAllocateMemory(device, &mai, 0, &textureMemory);

		vkBindImageMemory(device, textureImage, textureMemory, 0);
	}

	{ // convert image to optimal texture format
		VkCommandBufferAllocateInfo allocInfo = {};
		allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
		allocInfo.commandPool = commandPool;
		allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
		allocInfo.commandBufferCount = 1;

		VkCommandBuffer copyCommandBuffer;

		vkAllocateCommandBuffers(device, &allocInfo, &copyCommandBuffer);

		VkImageSubresourceRange subresourceRange = {};
		subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
		subresourceRange.baseMipLevel = 0;
		subresourceRange.levelCount = 1;
		subresourceRange.layerCount = 1;

		VkImageMemoryBarrier imageMemoryBarrier = {};
		imageMemoryBarrier.sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER;
		imageMemoryBarrier.srcAccessMask = 0;
		imageMemoryBarrier.dstAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
		imageMemoryBarrier.oldLayout = VK_IMAGE_LAYOUT_UNDEFINED;
		imageMemoryBarrier.newLayout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
		imageMemoryBarrier.image = textureImage;
		imageMemoryBarrier.subresourceRange = subresourceRange;

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

		vkBeginCommandBuffer(copyCommandBuffer, &beginInfo);

		vkCmdPipelineBarrier(copyCommandBuffer,
							 VK_PIPELINE_STAGE_HOST_BIT,
							 VK_PIPELINE_STAGE_TRANSFER_BIT,
							 0, 0, nullptr, 0, nullptr, 1, &imageMemoryBarrier);

		VkBufferImageCopy bufferCopyRegion = {};
		bufferCopyRegion.imageSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
		bufferCopyRegion.imageSubresource.mipLevel = 1;
		bufferCopyRegion.imageSubresource.baseArrayLayer = 0;
		bufferCopyRegion.imageSubresource.layerCount = 1;
		bufferCopyRegion.imageExtent.width = width;
		bufferCopyRegion.imageExtent.height = height;
		bufferCopyRegion.imageExtent.depth = 1;
		bufferCopyRegion.bufferOffset = 0;

		vkCmdCopyBufferToImage(
						copyCommandBuffer,
						stagingBuffer,
						textureImage,
						VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
						1,
						&bufferCopyRegion);

		imageMemoryBarrier.srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
		imageMemoryBarrier.dstAccessMask = VK_ACCESS_SHADER_READ_BIT;
		imageMemoryBarrier.oldLayout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
		imageMemoryBarrier.newLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;

		vkCmdPipelineBarrier(copyCommandBuffer,
							 VK_PIPELINE_STAGE_TRANSFER_BIT,
							 VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT,
							 0, 0, nullptr, 0, nullptr, 1, &imageMemoryBarrier);

		vkEndCommandBuffer(copyCommandBuffer);

		VkFenceCreateInfo fenceInfo = {};
		fenceInfo.sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO;
		fenceInfo.flags = 0;

		VkFence fence;
		vkCreateFence(device, &fenceInfo, 0, &fence);

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

		vkQueueSubmit(graphicsQueue, 1, &submitInfo, fence);

		vkWaitForFences(device, 1, &fence, VK_TRUE, -1);

		vkDestroyFence(device, fence, 0);
		vkFreeCommandBuffers(device, commandPool, 1, &copyCommandBuffer);

		vkFreeMemory(device, stagingMemory, 0);
		vkDestroyBuffer(device, stagingBuffer, 0);
	}


	{ //create sampler for sampling texture
		VkImageViewCreateInfo view = {};
		view.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
		view.viewType = VK_IMAGE_VIEW_TYPE_2D;
		view.format = format;
		view.components = { VK_COMPONENT_SWIZZLE_R, VK_COMPONENT_SWIZZLE_G, VK_COMPONENT_SWIZZLE_B, VK_COMPONENT_SWIZZLE_A };
		view.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
		view.subresourceRange.baseMipLevel = 0;
		view.subresourceRange.baseArrayLayer = 0;
		view.subresourceRange.layerCount = 1;
		view.subresourceRange.levelCount = 1;
		view.image = textureImage;
		vkCreateImageView(device, &view, nullptr, &textureView);

		VkSamplerCreateInfo sampler = {};
		sampler.sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO;
		sampler.magFilter = VK_FILTER_NEAREST;
		sampler.minFilter = VK_FILTER_NEAREST;
		sampler.mipmapMode = VK_SAMPLER_MIPMAP_MODE_NEAREST;
		sampler.addressModeU = VK_SAMPLER_ADDRESS_MODE_REPEAT;
		sampler.addressModeV = VK_SAMPLER_ADDRESS_MODE_REPEAT;
		sampler.addressModeW = VK_SAMPLER_ADDRESS_MODE_REPEAT;
		sampler.mipLodBias = 0.0f;
		sampler.compareOp = VK_COMPARE_OP_NEVER;
		sampler.minLod = 0.0f;
		sampler.maxLod = 0.0f;
		sampler.borderColor = VK_BORDER_COLOR_FLOAT_TRANSPARENT_BLACK;
		vkCreateSampler(device, &sampler, 0, &textureSampler);
	}
}

void CreateDescriptorSet()
{
	{ //create sample dsl
		VkDescriptorSetLayoutBinding setLayoutBinding = {};
		setLayoutBinding.descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
		setLayoutBinding.binding = 0;
		setLayoutBinding.descriptorCount = 1;
		setLayoutBinding.stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT;

		VkDescriptorSetLayoutCreateInfo descriptorLayoutCI = {};
		descriptorLayoutCI.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO;
		descriptorLayoutCI.bindingCount = 1;
		descriptorLayoutCI.pBindings = &setLayoutBinding;

		vkCreateDescriptorSetLayout(device, &descriptorLayoutCI, 0, &sampleDsl);
	}

	VkDescriptorPoolSize descriptorPoolSizes[1]{};
	descriptorPoolSizes[0] = {};
	descriptorPoolSizes[0].descriptorCount = 1;
	descriptorPoolSizes[0].type = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;

	VkDescriptorPoolCreateInfo descriptorPoolCI = {};
	descriptorPoolCI.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
	descriptorPoolCI.poolSizeCount = 1;
	descriptorPoolCI.pPoolSizes = descriptorPoolSizes;
	descriptorPoolCI.maxSets = 1;

	vkCreateDescriptorPool(device, &descriptorPoolCI, 0, &descriptorPool);

	{ //create sample descriptor set
		VkDescriptorSetAllocateInfo allocInfo = {};
		allocInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
		allocInfo.descriptorPool = descriptorPool;
		allocInfo.descriptorSetCount = 1;
		allocInfo.pSetLayouts = &sampleDsl;

		vkAllocateDescriptorSets(device, &allocInfo, &sampleDescriptorSet);

		VkDescriptorImageInfo imageInfo;
		imageInfo.imageView = textureView;
		imageInfo.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
		imageInfo.sampler = textureSampler;

		VkWriteDescriptorSet writeDescriptorSet = {};
		writeDescriptorSet.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
		writeDescriptorSet.dstSet = sampleDescriptorSet;
		writeDescriptorSet.dstBinding = 0;
		writeDescriptorSet.descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
		writeDescriptorSet.pImageInfo = &imageInfo;
		writeDescriptorSet.descriptorCount = 1;

		vkUpdateDescriptorSets(device, 1, &writeDescriptorSet, 0, 0);
	}
}

void CreateVertexBuffer()
{
	VkMemoryRequirements mr;

	{ //create triangle vertex buffer
		unsigned vboSize = sizeof(float) * 1 * 3 * 2; //1 * 3 x vec2

		VkBufferCreateInfo ci = {};
		ci.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
		ci.size = vboSize;
		ci.usage = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT;

		VkResult res = vkCreateBuffer(device, &ci, 0, &triangleVertexBuffer);

		vkGetBufferMemoryRequirements(device, triangleVertexBuffer, &mr);

		VkMemoryAllocateInfo mai = {};
		mai.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
		mai.allocationSize = mr.size;
		mai.memoryTypeIndex = getMemoryTypeIndex(pdmp, mr.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);

		res = vkAllocateMemory(device, &mai, 0, &triangleVertexBufferMemory);

		float vertices[] =
		{
			-1, -1,
			1, -1,
			0, 1
		};

		void* data;
		res = vkMapMemory(device, triangleVertexBufferMemory, 0, mr.size, 0, &data);
		memcpy(data, vertices, vboSize);
		vkUnmapMemory(device, triangleVertexBufferMemory);

		res = vkBindBufferMemory(device, triangleVertexBuffer, triangleVertexBufferMemory, 0);
	}

	printf("Vertex buffer created\n");
}

int main() {
	// Note: dynamically loading loader may be a better idea to fail gracefully when Vulkan is not supported

	// Create window for Vulkan
	//glfwInit();

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

	//window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "The 630 line cornflower blue window", nullptr, nullptr);

	// Use Vulkan
	setupVulkan();

	mainLoop();

	cleanup();


	return 0;
}