vulkan_renderer.cpp

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#include "version.h"
#include "vulkan_renderer.hpp"
#include "i_renderer_observer.hpp"
#include "vulkan_texture_resources.hpp"
#include "vulkan_material_resources.hpp"
#include "vulkan_mesh_resources.hpp"
#include "vulkan_render_resources.hpp"
#include "utility.hpp"
#include "material.hpp"
#include "texture_cache.hpp"
#include <stdexcept>
#include <iostream>
#include <set>
#include <algorithm>
#include <array>
 
namespace rendering_engine
{
 
#if defined(__FreeBSD__) || defined(NDEBUG)
    const bool enableValidationLayers = false;
#else
    const bool enableValidationLayers = true;
#endif
 
template<>
std::vector<VkVertexInputAttributeDescription>
VulkanRenderer::GetAttributeDescriptions<Vertex2D>();
 
template<>
std::vector<VkVertexInputAttributeDescription>
VulkanRenderer::GetAttributeDescriptions<VertexPositionColorTexture>();
 
template<>
std::vector<VkVertexInputAttributeDescription>
VulkanRenderer::GetAttributeDescriptions<VertexPositionColorTextureNormalTangent>();
 
VulkanRenderer::VulkanRenderer(IWindowSystem& windowSystem)
    :
    mWindowSystem{windowSystem},
    mCurrentFrame{0}
{}
 
void VulkanRenderer::InitializeRenderer()
{
    CreateInstance();
    SetupDebugMessenger();
    CreateSurface();
    PickPhysicalDevice();
    CreateLogicalDevice();
 
    CreateSwapChain();
    CreateImageViews();
    CreateRenderPass();
 
    CreateCommandPool();
 
    CreateColorResources();
    CreateDepthResources();
 
    CreateFramebuffers();
 
    CreateCommandBuffers();
    CreateSyncObjects();
}
 
void VulkanRenderer::DrawFrame()
{
    vkWaitForFences(mLogicalDevice, 1, &mInFlightFences[mCurrentFrame], VK_TRUE, UINT64_MAX);
 
    uint32_t imageIndex;
    VkResult result = vkAcquireNextImageKHR(mLogicalDevice, mSwapChain, UINT64_MAX, mImageAvailableSemaphores[mCurrentFrame], 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!");
        }
    }
 
    vkResetFences(mLogicalDevice, 1, &mInFlightFences[mCurrentFrame]);
 
    vkResetCommandBuffer(mCommandBuffers[mCurrentFrame], /*VkCommandBufferResetFlagBits*/ 0);
    RecordCommandBuffer(mCommandBuffers[mCurrentFrame], imageIndex);
 
    VkSubmitInfo submitInfo{};
    submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
 
    VkSemaphore waitSemaphores[] = { mImageAvailableSemaphores[mCurrentFrame] };
    VkPipelineStageFlags waitStages[] = { VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT };
    submitInfo.waitSemaphoreCount = 1;
    submitInfo.pWaitSemaphores = waitSemaphores;
    submitInfo.pWaitDstStageMask = waitStages;
 
    submitInfo.commandBufferCount = 1;
    submitInfo.pCommandBuffers = &mCommandBuffers[mCurrentFrame];
 
    VkSemaphore signalSemaphores[] = { mRenderFinishedSemaphores[mCurrentFrame] };
    submitInfo.signalSemaphoreCount = 1;
    submitInfo.pSignalSemaphores = signalSemaphores;
 
    if (vkQueueSubmit(mGraphicsQueue, 1, &submitInfo, mInFlightFences[mCurrentFrame]) != 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[] = { mSwapChain };
    presentInfo.swapchainCount = 1;
    presentInfo.pSwapchains = swapChains;
 
    presentInfo.pImageIndices = &imageIndex;
 
    result = vkQueuePresentKHR(mPresentQueue, &presentInfo);
 
    if (result == VK_ERROR_OUT_OF_DATE_KHR || result == VK_SUBOPTIMAL_KHR || mWindowSystem.IsFramebufferResized())
    {
        mWindowSystem.ResetFramebufferResizedFlag();
        RecreateSwapChain();
    }
    else
    {
        if (result != VK_SUCCESS)
        {
            throw std::runtime_error("failed to present swap chain image!");
        }
    }
 
    mCurrentFrame = (mCurrentFrame + 1) % MAX_FRAMES_IN_FLIGHT;
}
 
bool VulkanRenderer::BeginFrame()
{
    vkWaitForFences(mLogicalDevice, 1, &mInFlightFences[mCurrentFrame], VK_TRUE, UINT64_MAX);
 
    VkResult result = vkAcquireNextImageKHR(mLogicalDevice, mSwapChain, UINT64_MAX, mImageAvailableSemaphores[mCurrentFrame], VK_NULL_HANDLE, &mImageIndex);
 
    if (result == VK_ERROR_OUT_OF_DATE_KHR)
    {
        RecreateSwapChain();
        return false;
    }
    else
    {
        if (result != VK_SUCCESS && result != VK_SUBOPTIMAL_KHR)
        {
            throw std::runtime_error("failed to acquire swap chain image!");
        }
    }
 
    vkResetFences(mLogicalDevice, 1, &mInFlightFences[mCurrentFrame]);
 
    vkResetCommandBuffer(mCommandBuffers[mCurrentFrame], /*VkCommandBufferResetFlagBits*/ 0);
 
    return true;
}
 
void VulkanRenderer::BeginRenderPass()
{
    VkCommandBufferBeginInfo beginInfo{};
    beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
    //beginInfo.flags = 0; // Optional
    //beginInfo.pInheritanceInfo = nullptr; // Optional
 
    if (vkBeginCommandBuffer(mCommandBuffers[mCurrentFrame], &beginInfo) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to begin recording command buffer!");
    }
 
    VkRenderPassBeginInfo renderPassInfo{};
    renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
    renderPassInfo.renderPass = mRenderPass;
    renderPassInfo.framebuffer = mSwapChainFramebuffers[mImageIndex];
 
    renderPassInfo.renderArea.offset = { 0, 0 };
    renderPassInfo.renderArea.extent = mSwapChainExtent;
 
    std::array<VkClearValue, 2> clearValues{};
    clearValues[0].color = { {0.0f, 0.0f, 0.0f, 1.0f} };
    clearValues[1].depthStencil = { 1.0f, 0 };
    renderPassInfo.clearValueCount = static_cast<uint32_t>(clearValues.size());
    renderPassInfo.pClearValues = clearValues.data();
 
    vkCmdBeginRenderPass(mCommandBuffers[mCurrentFrame], &renderPassInfo, VK_SUBPASS_CONTENTS_INLINE);
}
 
void VulkanRenderer::EndRenderPass()
{
    vkCmdEndRenderPass(mCommandBuffers[mCurrentFrame]);
}
 
void VulkanRenderer::EndFrame()
{
    if (vkEndCommandBuffer(mCommandBuffers[mCurrentFrame]) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to record command buffer!");
    }
 
    VkSubmitInfo submitInfo{};
    submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
 
    VkSemaphore waitSemaphores[] = { mImageAvailableSemaphores[mCurrentFrame] };
    VkPipelineStageFlags waitStages[] = { VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT };
    submitInfo.waitSemaphoreCount = 1;
    submitInfo.pWaitSemaphores = waitSemaphores;
    submitInfo.pWaitDstStageMask = waitStages;
 
    submitInfo.commandBufferCount = 1;
    submitInfo.pCommandBuffers = &mCommandBuffers[mCurrentFrame];
 
    VkSemaphore signalSemaphores[] = { mRenderFinishedSemaphores[mCurrentFrame] };
    submitInfo.signalSemaphoreCount = 1;
    submitInfo.pSignalSemaphores = signalSemaphores;
 
    if (vkQueueSubmit(mGraphicsQueue, 1, &submitInfo, mInFlightFences[mCurrentFrame]) != 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[] = { mSwapChain };
    presentInfo.swapchainCount = 1;
    presentInfo.pSwapchains = swapChains;
 
    presentInfo.pImageIndices = &mImageIndex;
 
    VkResult result = vkQueuePresentKHR(mPresentQueue, &presentInfo);
 
    if (result == VK_ERROR_OUT_OF_DATE_KHR || result == VK_SUBOPTIMAL_KHR || mWindowSystem.IsFramebufferResized())
    {
        mWindowSystem.ResetFramebufferResizedFlag();
        RecreateSwapChain();
    }
    else
    {
        if (result != VK_SUCCESS)
        {
            throw std::runtime_error("failed to present swap chain image!");
        }
    }
 
    mCurrentFrame = (mCurrentFrame + 1) % MAX_FRAMES_IN_FLIGHT;
}
 
void VulkanRenderer::WaitIdle()
{
    vkDeviceWaitIdle(mLogicalDevice);
}
 
void VulkanRenderer::ShutdownRenderer()
{
    CleanupSwapChain();
 
    for (size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++)
    {
        vkDestroySemaphore(mLogicalDevice, mRenderFinishedSemaphores[i], nullptr);
        vkDestroySemaphore(mLogicalDevice, mImageAvailableSemaphores[i], nullptr);
        vkDestroyFence(mLogicalDevice, mInFlightFences[i], nullptr);
    }
 
    vkDestroyCommandPool(mLogicalDevice, mCommandPool, nullptr);
 
    vkDestroyDevice(mLogicalDevice, nullptr);
    if (enableValidationLayers)
    {
        DestroyDebugUtilsMessengerEXT(mInstance, mDebugMessenger, nullptr);
    }
    vkDestroySurfaceKHR(mInstance, mSurface, nullptr);
    vkDestroyInstance(mInstance, nullptr);
}
 
void VulkanRenderer::RegisterObserver(IRendererObserver* notifier)
{
    if (std::find(mObservers.begin(), mObservers.end(), notifier) == mObservers.end())
    {
        mObservers.push_back(notifier);
    }
}
 
void VulkanRenderer::UnregisterObserver(IRendererObserver* notifier)
{
    mObservers.erase(std::remove(mObservers.begin(), mObservers.end(), notifier), mObservers.end());
}
 
ITextureRenderResources* VulkanRenderer::ProvideTextureRenderResources() const
{
    return new VulkanTextureResources(const_cast<VulkanRenderer*>(this));
}
 
IMaterialRenderResources* VulkanRenderer::ProvideMaterialRenderResources() const
{
    return new VulkanMaterialResources(const_cast<VulkanRenderer*>(this));
}
 
IMeshRenderResources* VulkanRenderer::ProvideMeshRenderResources() const
{
    return new VulkanMeshResources(const_cast<VulkanRenderer*>(this));
}
 
IRenderResources* VulkanRenderer::ProvideRenderResources() const
{
    return new VulkanRenderResources(const_cast<VulkanRenderer*>(this));
}
 
void VulkanRenderer::CreateBuffer(VkDeviceSize size, VkBufferUsageFlags usage, VkMemoryPropertyFlags properties, VkBuffer& buffer, 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(mLogicalDevice, &bufferInfo, nullptr, &buffer) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create vertex buffer!");
    }
 
    VkMemoryRequirements memRequirements;
    vkGetBufferMemoryRequirements(mLogicalDevice, buffer, &memRequirements);
 
    VkMemoryAllocateInfo allocInfo{};
    allocInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
    allocInfo.allocationSize = memRequirements.size;
    allocInfo.memoryTypeIndex = FindMemoryType(memRequirements.memoryTypeBits, properties);
 
    if (vkAllocateMemory(mLogicalDevice, &allocInfo, nullptr, &bufferMemory) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to allocate vertex buffer memory!");
    }
 
    vkBindBufferMemory(mLogicalDevice, buffer, bufferMemory, 0);
}
 
void VulkanRenderer::CopyBuffer(VkBuffer srcBuffer, VkBuffer dstBuffer, VkDeviceSize size)
{
    auto commandBuffer = BeginSingleTimeCommand();
 
    VkBufferCopy copyRegion{};
    copyRegion.srcOffset = 0; // Optional
    copyRegion.dstOffset = 0; // Optional
    copyRegion.size = size;
    vkCmdCopyBuffer(commandBuffer, srcBuffer, dstBuffer, 1, &copyRegion);
 
    EndSingleTimeCommand(commandBuffer);
}
 
VkDevice& VulkanRenderer::GetLogicalDevice()
{
    return mLogicalDevice;
}
 
void VulkanRenderer::TransitionImageLayout(VkImage image, VkFormat format, VkImageLayout oldLayout, VkImageLayout newLayout, std::uint32_t mipmapLevels)
{
    VkCommandBuffer commandBuffer = BeginSingleTimeCommand();
 
    VkImageMemoryBarrier barrier{};
    barrier.sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER;
    barrier.oldLayout = oldLayout;
    barrier.newLayout = newLayout;
 
    barrier.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
    barrier.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
 
    barrier.image = image;
    barrier.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
    barrier.subresourceRange.baseMipLevel = 0;
    barrier.subresourceRange.levelCount = mipmapLevels;
    barrier.subresourceRange.baseArrayLayer = 0;
    barrier.subresourceRange.layerCount = 1;
 
    VkPipelineStageFlags sourceStage;
    VkPipelineStageFlags destinationStage;
 
    if (newLayout == VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL)
    {
        barrier.subresourceRange.aspectMask = VK_IMAGE_ASPECT_DEPTH_BIT;
 
        if (HasStencilComponent(format))
        {
            barrier.subresourceRange.aspectMask |= VK_IMAGE_ASPECT_STENCIL_BIT;
        }
    }
    else
    {
        barrier.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
    }
 
    if (oldLayout == VK_IMAGE_LAYOUT_UNDEFINED && newLayout == VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL) {
        barrier.srcAccessMask = 0;
        barrier.dstAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
 
        sourceStage = VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT;
        destinationStage = VK_PIPELINE_STAGE_TRANSFER_BIT;
    }
    else if (oldLayout == VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL && newLayout == VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL) {
        barrier.srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
        barrier.dstAccessMask = VK_ACCESS_SHADER_READ_BIT;
 
        sourceStage = VK_PIPELINE_STAGE_TRANSFER_BIT;
        destinationStage = VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT;
    }
    else if (oldLayout == VK_IMAGE_LAYOUT_UNDEFINED && newLayout == VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL) {
        barrier.srcAccessMask = 0;
        barrier.dstAccessMask = VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_READ_BIT | VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT;
 
        sourceStage = VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT;
        destinationStage = VK_PIPELINE_STAGE_EARLY_FRAGMENT_TESTS_BIT;
    }
    else {
        throw std::invalid_argument("unsupported layout transition!");
    }
 
    vkCmdPipelineBarrier(
        commandBuffer,
        sourceStage, destinationStage,
        0,
        0, nullptr,
        0, nullptr,
        1, &barrier
    );
 
    EndSingleTimeCommand(commandBuffer);
}
 
void VulkanRenderer::CopyBufferToImage(VkBuffer buffer, VkImage image, uint32_t width, uint32_t height)
{
    VkCommandBuffer commandBuffer = BeginSingleTimeCommand();
 
    VkBufferImageCopy region{};
    region.bufferOffset = 0;
    region.bufferRowLength = 0;
    region.bufferImageHeight = 0;
 
    region.imageSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
    region.imageSubresource.mipLevel = 0;
    region.imageSubresource.baseArrayLayer = 0;
    region.imageSubresource.layerCount = 1;
 
    region.imageOffset = { 0, 0, 0 };
    region.imageExtent = {
        width,
        height,
        1
    };
 
    vkCmdCopyBufferToImage(
        commandBuffer,
        buffer,
        image,
        VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
        1,
        &region
    );
 
    EndSingleTimeCommand(commandBuffer);
}
 
void VulkanRenderer::GenerateMipmaps(VkImage image, VkFormat imageFormat, int32_t texWidth, int32_t texHeight, uint32_t mipLevels)
{
    // Check if image format supports linear blitting
    VkFormatProperties formatProperties;
    vkGetPhysicalDeviceFormatProperties(mPhysicalDevice, imageFormat, &formatProperties);
 
    if (!(formatProperties.optimalTilingFeatures & VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT))
    {
        throw std::runtime_error("texture image format does not support linear blitting!");
    }
 
    VkCommandBuffer commandBuffer = BeginSingleTimeCommand();
 
    VkImageMemoryBarrier barrier{};
    barrier.sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER;
    barrier.image = image;
    barrier.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
    barrier.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
    barrier.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
    barrier.subresourceRange.baseArrayLayer = 0;
    barrier.subresourceRange.layerCount = 1;
    barrier.subresourceRange.levelCount = 1;
 
    int32_t mipWidth = texWidth;
    int32_t mipHeight = texHeight;
 
    for (uint32_t i = 1; i < mipLevels; i++)
    {
        barrier.subresourceRange.baseMipLevel = i - 1;
        barrier.oldLayout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
        barrier.newLayout = VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL;
        barrier.srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
        barrier.dstAccessMask = VK_ACCESS_TRANSFER_READ_BIT;
 
        vkCmdPipelineBarrier(commandBuffer,
            VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, 0,
            0, nullptr,
            0, nullptr,
            1, &barrier);
 
        VkImageBlit blit{};
        blit.srcOffsets[0] = { 0, 0, 0 };
        blit.srcOffsets[1] = { mipWidth, mipHeight, 1 };
        blit.srcSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
        blit.srcSubresource.mipLevel = i - 1;
        blit.srcSubresource.baseArrayLayer = 0;
        blit.srcSubresource.layerCount = 1;
        blit.dstOffsets[0] = { 0, 0, 0 };
        blit.dstOffsets[1] = { mipWidth > 1 ? mipWidth / 2 : 1, mipHeight > 1 ? mipHeight / 2 : 1, 1 };
        blit.dstSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
        blit.dstSubresource.mipLevel = i;
        blit.dstSubresource.baseArrayLayer = 0;
        blit.dstSubresource.layerCount = 1;
 
        vkCmdBlitImage(commandBuffer,
            image, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
            image, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
            1, &blit,
            VK_FILTER_LINEAR);
 
        barrier.oldLayout = VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL;
        barrier.newLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
        barrier.srcAccessMask = VK_ACCESS_TRANSFER_READ_BIT;
        barrier.dstAccessMask = VK_ACCESS_SHADER_READ_BIT;
 
        vkCmdPipelineBarrier(commandBuffer,
            VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT, 0,
            0, nullptr,
            0, nullptr,
            1, &barrier);
 
        if (mipWidth > 1) mipWidth /= 2;
        if (mipHeight > 1) mipHeight /= 2;
    }
 
    barrier.subresourceRange.baseMipLevel = mipLevels - 1;
    barrier.oldLayout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
    barrier.newLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
    barrier.srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
    barrier.dstAccessMask = VK_ACCESS_SHADER_READ_BIT;
 
    vkCmdPipelineBarrier(commandBuffer,
        VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT, 0,
        0, nullptr,
        0, nullptr,
        1, &barrier);
 
    EndSingleTimeCommand(commandBuffer);
}
 
void VulkanRenderer::CreateInstance()
{
    //Check validation layers.
    if (enableValidationLayers && !CheckValidationLayerSupport())
    {
        throw std::runtime_error("validation layers requested, but not available!");
    }
 
    VkApplicationInfo appInfo{};
    appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
    appInfo.pApplicationName = mWindowSystem.GetApplication().GetScreenSettings().name.c_str();
    appInfo.applicationVersion = VK_MAKE_VERSION(1, 0, 0);
    appInfo.pEngineName = "Rendering Engine";
    appInfo.engineVersion = VK_MAKE_VERSION(
        RENDERING_ENGINE_VERSION_MAJOR,
        RENDERING_ENGINE_VERSION_MINOR,
        RENDERING_ENGINE_VERSION_PATCH
    );
    appInfo.apiVersion = VK_API_VERSION_1_0;
 
    VkInstanceCreateInfo createInfo{};
    createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
    createInfo.pApplicationInfo = &appInfo;
 
    auto extensionsNames = GetRequiredExtensions();
    createInfo.enabledExtensionCount = static_cast<uint32_t>(extensionsNames.size());
    createInfo.ppEnabledExtensionNames = extensionsNames.data();
 
    VkDebugUtilsMessengerCreateInfoEXT debugCreateInfo{};
    if (enableValidationLayers)
    {
        createInfo.enabledLayerCount = static_cast<uint32_t>(mValidationLayers.size());
        createInfo.ppEnabledLayerNames = mValidationLayers.data();
 
        PopulateDebugMessengerCreateInfo(debugCreateInfo);
        createInfo.pNext = (VkDebugUtilsMessengerCreateInfoEXT*)&debugCreateInfo;
    }
    else
    {
        createInfo.enabledLayerCount = 0;
 
        createInfo.pNext = nullptr;
    }
 
    if (vkCreateInstance(&createInfo, nullptr, &mInstance) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create instance!");
    }
    std::cout << "Vulkan instance created" << std::endl;
}
 
bool VulkanRenderer::CheckValidationLayerSupport()
{
    uint32_t layerCount;
    vkEnumerateInstanceLayerProperties(&layerCount, nullptr);
 
    std::vector<VkLayerProperties> availableLayers(layerCount);
    vkEnumerateInstanceLayerProperties(&layerCount, availableLayers.data());
 
    for (const char* layerName : mValidationLayers)
    {
        bool layerFound = false;
 
        for (const auto& layerProperties : availableLayers)
        {
            if (strcmp(layerName, layerProperties.layerName) == 0)
            {
                layerFound = true;
                break;
            }
        }
 
        if (!layerFound)
        {
            return false;
        }
    }
 
    return true;
}
 
std::vector<const char*> VulkanRenderer::GetRequiredExtensions()
{
    uint32_t glfwExtensionCount = 0;
    const char** glfwExtensions;
    glfwExtensions = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);
 
    std::vector<const char*> extensions(glfwExtensions, glfwExtensions + glfwExtensionCount);
 
    if (enableValidationLayers)
    {
        extensions.push_back(VK_EXT_DEBUG_UTILS_EXTENSION_NAME);
    }
 
    return extensions;
}
 
void VulkanRenderer::PopulateDebugMessengerCreateInfo(VkDebugUtilsMessengerCreateInfoEXT& createInfo)
{
    createInfo = {};
    createInfo.sType = VK_STRUCTURE_TYPE_DEBUG_UTILS_MESSENGER_CREATE_INFO_EXT;
    createInfo.messageSeverity = VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_SEVERITY_WARNING_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_SEVERITY_ERROR_BIT_EXT;
    createInfo.messageType = VK_DEBUG_UTILS_MESSAGE_TYPE_GENERAL_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_TYPE_VALIDATION_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_TYPE_PERFORMANCE_BIT_EXT;
    createInfo.pfnUserCallback = DebugCallback;
}
 
VKAPI_ATTR VkBool32 VKAPI_CALL VulkanRenderer::DebugCallback(VkDebugUtilsMessageSeverityFlagBitsEXT messageSeverity, VkDebugUtilsMessageTypeFlagsEXT messageType, const VkDebugUtilsMessengerCallbackDataEXT* pCallbackData, void* pUserData)
{
    std::cerr << "validation layer: " << pCallbackData->pMessage << std::endl;
    return VK_FALSE;
}
 
void VulkanRenderer::SetupDebugMessenger()
{
    if (!enableValidationLayers)
    {
        return;
    }
 
    VkDebugUtilsMessengerCreateInfoEXT createInfo{};
    PopulateDebugMessengerCreateInfo(createInfo);
 
    if (CreateDebugUtilsMessengerEXT(mInstance, &createInfo, nullptr, &mDebugMessenger) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to set up debug messenger!");
    }
}
 
VkResult VulkanRenderer::CreateDebugUtilsMessengerEXT(VkInstance instance, VkDebugUtilsMessengerCreateInfoEXT const* pCreateInfo, VkAllocationCallbacks const* pAllocator, VkDebugUtilsMessengerEXT* pDebugMessenger)
{
    auto func = (PFN_vkCreateDebugUtilsMessengerEXT)vkGetInstanceProcAddr(instance, "vkCreateDebugUtilsMessengerEXT");
    if (func != nullptr)
    {
        return func(instance, pCreateInfo, pAllocator, pDebugMessenger);
    }
    else
    {
        return VK_ERROR_EXTENSION_NOT_PRESENT;
    }
}
 
void VulkanRenderer::DestroyDebugUtilsMessengerEXT(VkInstance instance, VkDebugUtilsMessengerEXT debugMessenger, const VkAllocationCallbacks* pAllocator)
{
    auto func = (PFN_vkDestroyDebugUtilsMessengerEXT)vkGetInstanceProcAddr(instance, "vkDestroyDebugUtilsMessengerEXT");
    if (func != nullptr)
    {
        func(instance, debugMessenger, pAllocator);
    }
}
 
void VulkanRenderer::CreateSurface()
{
    GLFWwindow* window = static_cast<GLFWwindow*>(mWindowSystem.GetNativeHandle());
    if (glfwCreateWindowSurface(mInstance, window, nullptr, &mSurface) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create window surface!");
    }
}
 
void VulkanRenderer::PickPhysicalDevice()
{
    uint32_t deviceCount = 0;
    vkEnumeratePhysicalDevices(mInstance, &deviceCount, nullptr);
 
    if (deviceCount == 0)
    {
        throw std::runtime_error("failed to find GPUs with Vulkan support!");
    }
 
    std::vector<VkPhysicalDevice> devices(deviceCount);
    vkEnumeratePhysicalDevices(mInstance, &deviceCount, devices.data());
 
    for (const auto& device : devices)
    {
        if (IsDeviceSuitable(device)) {
            mPhysicalDevice = device;
            vkGetPhysicalDeviceFeatures(mPhysicalDevice, &mPhysDevSupportedFeatures);
            vkGetPhysicalDeviceProperties(mPhysicalDevice, &mPhysicalDeviceProperties);
            mMSAASamples = CheckMaxUsableSampleCount();
            break;
        }
    }
 
    if (mPhysicalDevice == VK_NULL_HANDLE)
    {
        throw std::runtime_error("failed to find a suitable GPU!");
    }
}
 
bool VulkanRenderer::IsDeviceSuitable(VkPhysicalDevice device)
{
    // Next features could be used for rating and checkink proper device
 
    //VkPhysicalDeviceProperties deviceProperties;
    //vkGetPhysicalDeviceProperties(device, &deviceProperties);
 
    // VkPhysicalDeviceFeatures supportedFeatures;
    // vkGetPhysicalDeviceFeatures(device, &supportedFeatures);
 
    //return deviceProperties.deviceType == VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU &&
    //       deviceFeatures.geometryShader;
 
    QueueFamilyIndices indices = FindQueueFamilies(device);
 
    bool extensionsSupported = CheckDeviceExtensionSupport(device);
 
    bool swapChainAdequate = false;
    if (extensionsSupported)
    {
        auto const swapChainSupport = QuerySwapChainSupport(device);
        swapChainAdequate = !swapChainSupport.formats.empty() && !swapChainSupport.presentModes.empty();
    }
    return indices.IsComplete() && extensionsSupported && swapChainAdequate;
}
 
QueueFamilyIndices VulkanRenderer::FindQueueFamilies(VkPhysicalDevice device)
{
    QueueFamilyIndices indices;
    // Logic to find queue family indices to populate struct with
    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.queueFlags & VK_QUEUE_GRAPHICS_BIT)
        {
            indices.graphicsFamily = i;
        }
 
        VkBool32 presentSupport = false;
        vkGetPhysicalDeviceSurfaceSupportKHR(device, i, mSurface, &presentSupport);
        if (presentSupport)
        {
            indices.presentFamily = i;
        }
        if (indices.IsComplete())
        {
            break;
        }
 
        i++;
    }
    return indices;
}
 
bool VulkanRenderer::CheckDeviceExtensionSupport(VkPhysicalDevice physicalDevice)
{
    uint32_t extensionCount;
    vkEnumerateDeviceExtensionProperties(physicalDevice, nullptr, &extensionCount, nullptr);
 
    std::vector<VkExtensionProperties> availableExtensions(extensionCount);
    vkEnumerateDeviceExtensionProperties(physicalDevice, nullptr, &extensionCount, availableExtensions.data());
 
    std::set<std::string> requiredExtensions(mDeviceExtensions.begin(), mDeviceExtensions.end());
 
    for (const auto& extension : availableExtensions)
    {
        requiredExtensions.erase(extension.extensionName);
    }
 
    return requiredExtensions.empty();
}
 
SwapChainSupportDetails VulkanRenderer::QuerySwapChainSupport(VkPhysicalDevice device)
{
    SwapChainSupportDetails scsDetails;
 
    vkGetPhysicalDeviceSurfaceCapabilitiesKHR(device, mSurface, &scsDetails.capabilities);
 
    uint32_t formatCount;
    vkGetPhysicalDeviceSurfaceFormatsKHR(device, mSurface, &formatCount, nullptr);
 
    if (formatCount != 0)
    {
        scsDetails.formats.resize(formatCount);
        vkGetPhysicalDeviceSurfaceFormatsKHR(device, mSurface, &formatCount, scsDetails.formats.data());
    }
 
    uint32_t presentModeCount;
    vkGetPhysicalDeviceSurfacePresentModesKHR(device, mSurface, &presentModeCount, nullptr);
 
    if (presentModeCount != 0)
    {
        scsDetails.presentModes.resize(presentModeCount);
        vkGetPhysicalDeviceSurfacePresentModesKHR(device, mSurface, &presentModeCount, scsDetails.presentModes.data());
    }
 
    return scsDetails;
}
 
VkSampleCountFlagBits VulkanRenderer::CheckMaxUsableSampleCount()
{
    VkPhysicalDeviceProperties physicalDeviceProperties;
    vkGetPhysicalDeviceProperties(mPhysicalDevice, &physicalDeviceProperties);
 
    VkSampleCountFlags counts = physicalDeviceProperties.limits.framebufferColorSampleCounts & physicalDeviceProperties.limits.framebufferDepthSampleCounts;
    if (counts & VK_SAMPLE_COUNT_64_BIT) { return VK_SAMPLE_COUNT_64_BIT; }
    if (counts & VK_SAMPLE_COUNT_32_BIT) { return VK_SAMPLE_COUNT_32_BIT; }
    if (counts & VK_SAMPLE_COUNT_16_BIT) { return VK_SAMPLE_COUNT_16_BIT; }
    if (counts & VK_SAMPLE_COUNT_8_BIT) { return VK_SAMPLE_COUNT_8_BIT; }
    if (counts & VK_SAMPLE_COUNT_4_BIT) { return VK_SAMPLE_COUNT_4_BIT; }
    if (counts & VK_SAMPLE_COUNT_2_BIT) { return VK_SAMPLE_COUNT_2_BIT; }
 
    return VK_SAMPLE_COUNT_1_BIT;
}
 
void VulkanRenderer::CreateLogicalDevice()
{
    QueueFamilyIndices indices = FindQueueFamilies(mPhysicalDevice);
 
    std::vector<VkDeviceQueueCreateInfo> queueCreateInfos;
    std::set<uint32_t> uniqueQueueFamilies = { indices.graphicsFamily.value(), indices.presentFamily.value() };
 
    float queuePriority = 1.0f;
    for (uint32_t queueFamily : uniqueQueueFamilies)
    {
        VkDeviceQueueCreateInfo queueCreateInfo{};
        queueCreateInfo.sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO;
        queueCreateInfo.queueFamilyIndex = queueFamily;
        queueCreateInfo.queueCount = 1;
        queueCreateInfo.pQueuePriorities = &queuePriority;
        queueCreateInfos.push_back(queueCreateInfo);
    }
 
    VkDeviceQueueCreateInfo queueCreateInfo{};
    queueCreateInfo.sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO;
    queueCreateInfo.queueFamilyIndex = indices.graphicsFamily.value();
    queueCreateInfo.queueCount = 1;
 
    queueCreateInfo.pQueuePriorities = &queuePriority;
 
    VkPhysicalDeviceFeatures deviceFeatures{};
    if (mPhysDevSupportedFeatures.samplerAnisotropy)
    {
        deviceFeatures.samplerAnisotropy = VK_TRUE;
    }
    else
    {
        deviceFeatures.samplerAnisotropy = VK_FALSE;
    }
 
    if (mPhysDevSupportedFeatures.sampleRateShading)
    {
        deviceFeatures.sampleRateShading = VK_TRUE;
    }
    else
    {
        deviceFeatures.sampleRateShading = VK_FALSE;
    }
 
    VkDeviceCreateInfo createInfo{};
    createInfo.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO;
 
    createInfo.pQueueCreateInfos = queueCreateInfos.data();
    createInfo.queueCreateInfoCount = static_cast<uint32_t>(queueCreateInfos.size());
 
    createInfo.pEnabledFeatures = &deviceFeatures;
 
    createInfo.enabledExtensionCount = static_cast<uint32_t>(mDeviceExtensions.size());
    createInfo.ppEnabledExtensionNames = mDeviceExtensions.data();
 
    if (enableValidationLayers)
    {
        createInfo.enabledLayerCount = static_cast<uint32_t>(mValidationLayers.size());
        createInfo.ppEnabledLayerNames = mValidationLayers.data();
    }
    else
    {
        createInfo.enabledLayerCount = 0;
    }
 
    if (vkCreateDevice(mPhysicalDevice, &createInfo, nullptr, &mLogicalDevice) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create logical device!");
    }
 
    vkGetDeviceQueue(mLogicalDevice, indices.graphicsFamily.value(), 0, &mGraphicsQueue);
    vkGetDeviceQueue(mLogicalDevice, indices.presentFamily.value(), 0, &mPresentQueue);
}
 
void VulkanRenderer::CreateSwapChain()
{
    SwapChainSupportDetails swapChainSupport = QuerySwapChainSupport(mPhysicalDevice);
 
    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 = mSurface;
 
    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(mPhysicalDevice);
    uint32_t queueFamilyIndices[] = { indices.graphicsFamily.value(), indices.presentFamily.value() };
 
    if (indices.graphicsFamily != indices.presentFamily) {
        createInfo.imageSharingMode = VK_SHARING_MODE_CONCURRENT;
        createInfo.queueFamilyIndexCount = 2;
        createInfo.pQueueFamilyIndices = queueFamilyIndices;
    }
    else
    {
        createInfo.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
        createInfo.queueFamilyIndexCount = 0; // Optional
        createInfo.pQueueFamilyIndices = nullptr; // Optional
    }
 
    createInfo.preTransform = swapChainSupport.capabilities.currentTransform;
    createInfo.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
    createInfo.presentMode = presentMode;
    createInfo.clipped = VK_TRUE;
    createInfo.oldSwapchain = VK_NULL_HANDLE;
 
    if (vkCreateSwapchainKHR(mLogicalDevice, &createInfo, nullptr, &mSwapChain) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create swap chain!");
    }
 
    vkGetSwapchainImagesKHR(mLogicalDevice, mSwapChain, &imageCount, nullptr);
    mSwapChainImages.resize(imageCount);
    vkGetSwapchainImagesKHR(mLogicalDevice, mSwapChain, &imageCount, mSwapChainImages.data());
 
    mSwapChainImageFormat = surfaceFormat.format;
    mSwapChainExtent = extent;
}
 
void VulkanRenderer::RecreateSwapChain()
{
    int width = 0;
    int height = 0;
 
    while (width == 0 || height == 0)
    {
        GLFWwindow* window = static_cast<GLFWwindow*>(mWindowSystem.GetNativeHandle());
        glfwGetFramebufferSize(window, &width, &height);
        glfwWaitEvents();
    }
    vkDeviceWaitIdle(mLogicalDevice);
 
    CleanupSwapChain();
 
    for (auto& observer : mObservers)
    {
        observer->OnRenderResourcesRelease();
    }
 
    CreateSwapChain();
    CreateImageViews();
    CreateRenderPass();
 
    CreateColorResources();
    CreateDepthResources();
    CreateFramebuffers();
    CreateCommandBuffers();
 
    for (auto& observer : mObservers)
    {
        observer->OnRenderResourcesRebuild();
    }
}
 
VkSurfaceFormatKHR VulkanRenderer::ChooseSwapSurfaceFormat(std::vector<VkSurfaceFormatKHR> const& availableFormats)
{
    for (const auto& availableFormat : availableFormats)
    {
        if (availableFormat.format == VK_FORMAT_B8G8R8A8_SRGB && availableFormat.colorSpace == VK_COLOR_SPACE_SRGB_NONLINEAR_KHR)
        {
            return availableFormat;
        }
    }
 
    return availableFormats[0];
}
 
VkPresentModeKHR VulkanRenderer::ChooseSwapPresentMode(std::vector<VkPresentModeKHR>const& availablePresentModes)
{
    for (const auto& availablePresentMode : availablePresentModes)
    {
        if (availablePresentMode == VK_PRESENT_MODE_MAILBOX_KHR)
        {
            return availablePresentMode;
        }
    }
    return VK_PRESENT_MODE_FIFO_KHR;
}
 
VkExtent2D VulkanRenderer::ChooseSwapExtent(VkSurfaceCapabilitiesKHR const& capabilities)
{
    if (capabilities.currentExtent.width != UINT32_MAX)
    {
        return capabilities.currentExtent;
    }
    else
    {
        int width, height;
        GLFWwindow* window = static_cast<GLFWwindow*>(mWindowSystem.GetNativeHandle());
        glfwGetFramebufferSize(window, &width, &height);
 
        VkExtent2D actualExtent = {
            static_cast<uint32_t>(width),
            static_cast<uint32_t>(height)
        };
 
        actualExtent.width = std::clamp(actualExtent.width, capabilities.minImageExtent.width, capabilities.maxImageExtent.width);
        actualExtent.height = std::clamp(actualExtent.height, capabilities.minImageExtent.height, capabilities.maxImageExtent.height);
 
        return actualExtent;
    }
}
 
void VulkanRenderer::CreateImageViews()
{
    mSwapChainImageViews.resize(mSwapChainImages.size());
 
    for (uint32_t i = 0; i < mSwapChainImages.size(); i++)
    {
        mSwapChainImageViews[i] = CreateImageView(mSwapChainImages[i], mSwapChainImageFormat, VK_IMAGE_ASPECT_COLOR_BIT, 1);
    }
}
 
VkImageView VulkanRenderer::CreateImageView(VkImage image, VkFormat format, VkImageAspectFlags aspectFlags, std::uint32_t mipmapLevels)
{
    VkImageViewCreateInfo viewInfo{};
    viewInfo.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
    viewInfo.image = image;
    viewInfo.viewType = VK_IMAGE_VIEW_TYPE_2D;
    viewInfo.format = format;
    viewInfo.subresourceRange.aspectMask = aspectFlags;
    viewInfo.subresourceRange.baseMipLevel = 0;
    viewInfo.subresourceRange.levelCount = mipmapLevels;
    viewInfo.subresourceRange.baseArrayLayer = 0;
    viewInfo.subresourceRange.layerCount = 1;
 
    VkImageView imageView;
    if (vkCreateImageView(mLogicalDevice, &viewInfo, nullptr, &imageView) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create texture image view!");
    }
 
    return imageView;
}
 
void VulkanRenderer::CreateRenderPass()
{
    VkAttachmentDescription colorAttachment{};
    colorAttachment.format = mSwapChainImageFormat;
    colorAttachment.samples = mMSAASamples;
    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_COLOR_ATTACHMENT_OPTIMAL;
 
    VkAttachmentReference colorAttachmentRef{};
    colorAttachmentRef.attachment = 0;
    colorAttachmentRef.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
 
    VkAttachmentDescription depthAttachment{};
    depthAttachment.format = FindDepthFormat();
    depthAttachment.samples = mMSAASamples;
    depthAttachment.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
    depthAttachment.storeOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
    depthAttachment.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
    depthAttachment.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
    depthAttachment.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
    depthAttachment.finalLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
 
    VkAttachmentReference depthAttachmentRef{};
    depthAttachmentRef.attachment = 1;
    depthAttachmentRef.layout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
 
    VkAttachmentDescription colorAttachmentResolve{};
    colorAttachmentResolve.format = mSwapChainImageFormat;
    colorAttachmentResolve.samples = VK_SAMPLE_COUNT_1_BIT;
    colorAttachmentResolve.loadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
    colorAttachmentResolve.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
    colorAttachmentResolve.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
    colorAttachmentResolve.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
    colorAttachmentResolve.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
    colorAttachmentResolve.finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;
 
    VkAttachmentReference colorAttachmentResolveRef{};
    colorAttachmentResolveRef.attachment = 2;
    colorAttachmentResolveRef.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
 
    VkSubpassDescription subpass{};
    subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
    subpass.colorAttachmentCount = 1;
    subpass.pColorAttachments = &colorAttachmentRef;
    subpass.pDepthStencilAttachment = &depthAttachmentRef;
    subpass.pResolveAttachments = &colorAttachmentResolveRef;
 
    VkSubpassDependency dependency{};
    dependency.srcSubpass = VK_SUBPASS_EXTERNAL;
    dependency.dstSubpass = 0;
    dependency.srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT | VK_PIPELINE_STAGE_EARLY_FRAGMENT_TESTS_BIT;
    dependency.srcAccessMask = 0;
    dependency.dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT | VK_PIPELINE_STAGE_EARLY_FRAGMENT_TESTS_BIT;
    dependency.dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT | VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT;
 
    std::array<VkAttachmentDescription, 3> attachments = { colorAttachment, depthAttachment, colorAttachmentResolve };
 
    VkRenderPassCreateInfo renderPassInfo{};
    renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
    renderPassInfo.attachmentCount = static_cast<uint32_t>(attachments.size());
    renderPassInfo.pAttachments = attachments.data();
    renderPassInfo.subpassCount = 1;
    renderPassInfo.pSubpasses = &subpass;
    renderPassInfo.dependencyCount = 1;
    renderPassInfo.pDependencies = &dependency;
 
    if (vkCreateRenderPass(mLogicalDevice, &renderPassInfo, nullptr, &mRenderPass) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create render pass!");
    }
}
 
VkFormat VulkanRenderer::FindDepthFormat()
{
    return FindSupportedFormat(
        { VK_FORMAT_D32_SFLOAT, VK_FORMAT_D32_SFLOAT_S8_UINT, VK_FORMAT_D24_UNORM_S8_UINT },
        VK_IMAGE_TILING_OPTIMAL,
        VK_FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT
    );
}
 
VkFormat VulkanRenderer::FindSupportedFormat(const std::vector<VkFormat>& candidates, VkImageTiling tiling, VkFormatFeatureFlags features)
{
    for (VkFormat format : candidates)
    {
        VkFormatProperties props;
        vkGetPhysicalDeviceFormatProperties(mPhysicalDevice, format, &props);
 
        if (tiling == VK_IMAGE_TILING_LINEAR && (props.linearTilingFeatures & features) == features)
        {
            return format;
        }
        else if (tiling == VK_IMAGE_TILING_OPTIMAL && (props.optimalTilingFeatures & features) == features)
        {
            return format;
        }
    }
 
    throw std::runtime_error("failed to find supported format!");
}
 
void VulkanRenderer::CreateCommandPool()
{
    QueueFamilyIndices queueFamilyIndices = FindQueueFamilies(mPhysicalDevice);
 
    VkCommandPoolCreateInfo poolInfo{};
    poolInfo.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
    poolInfo.queueFamilyIndex = queueFamilyIndices.graphicsFamily.value();
    poolInfo.flags = VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT;
 
    if (vkCreateCommandPool(mLogicalDevice, &poolInfo, nullptr, &mCommandPool) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create command pool!");
    }
}
 
void VulkanRenderer::CreateColorResources()
{
    VkFormat colorFormat = mSwapChainImageFormat;
 
    CreateVulkanImage(mSwapChainExtent.width, mSwapChainExtent.height, 1, mMSAASamples, colorFormat, VK_IMAGE_TILING_OPTIMAL,
        VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT | VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT,
        VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, mColorImage, mColorImageMemory);
    mColorImageView = CreateImageView(mColorImage, colorFormat, VK_IMAGE_ASPECT_COLOR_BIT, 1);
}
 
void VulkanRenderer::CreateVulkanImage(uint32_t width, uint32_t height, std::uint32_t mipmapLevels, VkSampleCountFlagBits numSamples, VkFormat format, VkImageTiling tiling, VkImageUsageFlags usage, VkMemoryPropertyFlags properties, VkImage& image, VkDeviceMemory& imageMemory)
{
    VkImageCreateInfo imageInfo{};
    imageInfo.sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO;
    imageInfo.imageType = VK_IMAGE_TYPE_2D;
    imageInfo.extent.width = static_cast<uint32_t>(width);
    imageInfo.extent.height = static_cast<uint32_t>(height);
    imageInfo.extent.depth = 1;
    imageInfo.mipLevels = mipmapLevels;
    imageInfo.arrayLayers = 1;
 
    imageInfo.format = format;
    imageInfo.tiling = tiling;
 
    imageInfo.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
 
    imageInfo.usage = usage;
 
    imageInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
 
    imageInfo.samples = numSamples;
    imageInfo.flags = 0; // Optional
 
    if (vkCreateImage(mLogicalDevice, &imageInfo, nullptr, &image) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create image!");
    }
 
    VkMemoryRequirements memRequirements;
    vkGetImageMemoryRequirements(mLogicalDevice, image, &memRequirements);
 
    VkMemoryAllocateInfo allocInfo{};
    allocInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
    allocInfo.allocationSize = memRequirements.size;
    allocInfo.memoryTypeIndex = FindMemoryType(memRequirements.memoryTypeBits, properties);
 
    if (vkAllocateMemory(mLogicalDevice, &allocInfo, nullptr, &imageMemory) != VK_SUCCESS) {
        throw std::runtime_error("failed to allocate image memory!");
    }
 
    vkBindImageMemory(mLogicalDevice, image, imageMemory, 0);
}
 
uint32_t VulkanRenderer::FindMemoryType(uint32_t typeFilter, VkMemoryPropertyFlags properties)
{
    VkPhysicalDeviceMemoryProperties memProperties;
    vkGetPhysicalDeviceMemoryProperties(mPhysicalDevice, &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!");
}
 
VkPhysicalDevice& VulkanRenderer::GetPhysicalDevice()
{
    return mPhysicalDevice;
}
 
VkPhysicalDeviceFeatures& VulkanRenderer::GetPhysDevSupportedFeatures()
{
    return mPhysDevSupportedFeatures;
}
 
VkDescriptorSetLayout VulkanRenderer::CreateDescriptorSetLayout(Material* material)
{
    std::uint32_t bindingNumber = 0;
    std::vector<VkDescriptorSetLayoutBinding> bindings;
 
    // Uniform buffer to transmit transformation matrix
    VkDescriptorSetLayoutBinding uboLayoutBinding{};
    uboLayoutBinding.binding = bindingNumber;
    uboLayoutBinding.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
    uboLayoutBinding.descriptorCount = 1;
    uboLayoutBinding.stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
    uboLayoutBinding.pImmutableSamplers = nullptr; // Optional
 
    bindings.push_back(uboLayoutBinding);
 
    PackedMaterialData packedMaterialData = material->PackMaterialParameters();
    if (!packedMaterialData.buffer.empty())
    {
        ++bindingNumber;
        // Uniform buffer to transmit custom material variables
        VkDescriptorSetLayoutBinding customMaterialVariables;
        customMaterialVariables.binding = bindingNumber;
        customMaterialVariables.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
        customMaterialVariables.descriptorCount = 1;
        customMaterialVariables.stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
        customMaterialVariables.pImmutableSamplers = nullptr; // Optional
 
        bindings.push_back(customMaterialVariables);
    }
 
    for (const auto& textureName : material->GetTextures())
    {
        (void)textureName;
        ++bindingNumber;
        VkDescriptorSetLayoutBinding samplerLayoutBinding{};
        samplerLayoutBinding.binding = bindingNumber;
        samplerLayoutBinding.descriptorCount = 1;
        samplerLayoutBinding.descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
        samplerLayoutBinding.pImmutableSamplers = nullptr;
        samplerLayoutBinding.stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT;
 
        bindings.push_back(samplerLayoutBinding);
    }
 
    VkDescriptorSetLayoutCreateInfo layoutInfo{};
    layoutInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO;
    layoutInfo.bindingCount = static_cast<uint32_t>(bindings.size());
    layoutInfo.pBindings = bindings.data();
 
    VkDescriptorSetLayout result;
    if (vkCreateDescriptorSetLayout(mLogicalDevice, &layoutInfo, nullptr, &result) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create descriptor set layout!");
    }
 
    return result;
}
 
std::vector<VkCommandBuffer> VulkanRenderer::GetComandBuffers()
{
    return mCommandBuffers;
}
 
std::pair<VkPipelineLayout, VkPipeline> VulkanRenderer::CreateGraphicsPipeline(Material* material, VkDescriptorSetLayout& descriptorSetLayout, std::vector<char>& spvVertShaderCode, std::vector<char>& spvFragShaderCode)
{
    VkPipelineLayout pipelineLayout;
    VkPipeline pipeline;
 
    VkShaderModule vertShaderModule = CreateShaderModule(spvVertShaderCode);
    VkShaderModule fragShaderModule = CreateShaderModule(spvFragShaderCode);
 
    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;
 
    VkVertexInputBindingDescription bindingDescription;
    std::vector<VkVertexInputAttributeDescription> attributeDescriptions{};
 
    if (material->GetMaterialSettings().materialDomain == MaterialDomain::Sprite2D)
    {
        bindingDescription = GetBindingDescription<Vertex2D>();
        attributeDescriptions = GetAttributeDescriptions<Vertex2D>();
    }
    if (material->GetMaterialSettings().materialDomain == MaterialDomain::Surface3D)
    {
        bindingDescription = GetBindingDescription<VertexPositionColorTextureNormalTangent>();
        attributeDescriptions = GetAttributeDescriptions<VertexPositionColorTextureNormalTangent>();
    }
 
    vertexInputInfo.vertexBindingDescriptionCount = 1;
    vertexInputInfo.vertexAttributeDescriptionCount = static_cast<uint32_t>(attributeDescriptions.size());
 
    vertexInputInfo.pVertexBindingDescriptions = &bindingDescription;
    vertexInputInfo.pVertexAttributeDescriptions = attributeDescriptions.data();
 
    VkPipelineInputAssemblyStateCreateInfo inputAssembly{};
    inputAssembly.sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO;
    inputAssembly.topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
    inputAssembly.primitiveRestartEnable = VK_FALSE;
 
    VkViewport viewport{};
    viewport.x = 0.0f;
    viewport.y = 0.0f;
    viewport.width = (float)mSwapChainExtent.width;
    viewport.height = (float)mSwapChainExtent.height;
    viewport.minDepth = 0.0f;
    viewport.maxDepth = 1.0f;
 
    VkRect2D scissor{};
    scissor.offset = { 0, 0 };
    scissor.extent = mSwapChainExtent;
 
    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;
    if (material->GetMaterialSettings().materialDomain == MaterialDomain::Sprite2D)
    {
        rasterizer.cullMode = VK_CULL_MODE_NONE;
    }
    else
    {
        rasterizer.cullMode = VK_CULL_MODE_BACK_BIT;
    }
    rasterizer.frontFace = VK_FRONT_FACE_COUNTER_CLOCKWISE;
    rasterizer.depthBiasEnable = VK_FALSE;
    rasterizer.depthBiasConstantFactor = 0.0f; // Optional
    rasterizer.depthBiasClamp = 0.0f; // Optional
    rasterizer.depthBiasSlopeFactor = 0.0f; // Optional
 
    VkPipelineMultisampleStateCreateInfo multisampling{};
    multisampling.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
    multisampling.sampleShadingEnable = VK_FALSE;
    multisampling.rasterizationSamples = mMSAASamples;
    multisampling.minSampleShading = 1.0f; // Optional
    multisampling.pSampleMask = nullptr; // Optional
    multisampling.alphaToCoverageEnable = VK_FALSE; // Optional
    multisampling.alphaToOneEnable = VK_FALSE; // Optional
 
    VkPipelineColorBlendAttachmentState colorBlendAttachment{};
    colorBlendAttachment.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT | VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
    colorBlendAttachment.blendEnable = (material->GetMaterialSettings().blendMode == BlendMode::Translucent) ? VK_TRUE : VK_FALSE;
    colorBlendAttachment.srcColorBlendFactor = VK_BLEND_FACTOR_SRC_ALPHA;
    colorBlendAttachment.dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
    colorBlendAttachment.colorBlendOp = VK_BLEND_OP_ADD; // Optional
    colorBlendAttachment.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
    colorBlendAttachment.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
    colorBlendAttachment.alphaBlendOp = VK_BLEND_OP_ADD; // Optional
 
    VkPipelineColorBlendStateCreateInfo colorBlending{};
    colorBlending.sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;
    colorBlending.logicOpEnable = VK_FALSE;
    colorBlending.logicOp = VK_LOGIC_OP_COPY; // Optional
    colorBlending.attachmentCount = 1;
    colorBlending.pAttachments = &colorBlendAttachment;
    colorBlending.blendConstants[0] = 0.0f; // Optional
    colorBlending.blendConstants[1] = 0.0f; // Optional
    colorBlending.blendConstants[2] = 0.0f; // Optional
    colorBlending.blendConstants[3] = 0.0f; // Optional
 
    // To use dynamicState, assign reference to it in pipelineInfo.pDynamicState.
    std::vector<VkDynamicState> dynamicStates = {
        VK_DYNAMIC_STATE_VIEWPORT,
        VK_DYNAMIC_STATE_SCISSOR
    };
    VkPipelineDynamicStateCreateInfo dynamicState{};
    dynamicState.sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO;
    dynamicState.dynamicStateCount = static_cast<uint32_t>(dynamicStates.size());
    dynamicState.pDynamicStates = dynamicStates.data();
 
    VkPipelineLayoutCreateInfo pipelineLayoutInfo{};
    pipelineLayoutInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
    pipelineLayoutInfo.setLayoutCount = 1;
    pipelineLayoutInfo.pSetLayouts = &descriptorSetLayout;
 
    if (vkCreatePipelineLayout(mLogicalDevice, &pipelineLayoutInfo, nullptr, &pipelineLayout) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create pipeline layout!");
    }
 
    VkPipelineDepthStencilStateCreateInfo depthStencil{};
    depthStencil.sType = VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO;
    if (material->GetMaterialSettings().materialDomain == MaterialDomain::Sprite2D)
    {
        depthStencil.depthTestEnable = VK_FALSE;
        depthStencil.depthWriteEnable = VK_FALSE;
    }
    else
    {
        depthStencil.depthTestEnable = VK_TRUE;
        depthStencil.depthWriteEnable = (material->GetMaterialSettings().blendMode == BlendMode::Opaque) ? VK_TRUE : VK_FALSE;
    }
    depthStencil.depthCompareOp = VK_COMPARE_OP_LESS;
    depthStencil.depthBoundsTestEnable = VK_FALSE;
    //depthStencil.minDepthBounds = 0.0f; // Optional
    //depthStencil.maxDepthBounds = 1.0f; // Optional
    depthStencil.stencilTestEnable = VK_FALSE;
    //depthStencil.front = {}; // Optional
    depthStencil.back = {}; // Optional
 
    VkGraphicsPipelineCreateInfo pipelineInfo{};
    pipelineInfo.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
    pipelineInfo.stageCount = 2;
    pipelineInfo.pStages = shaderStages;
    pipelineInfo.pVertexInputState = &vertexInputInfo;
    pipelineInfo.pInputAssemblyState = &inputAssembly;
    pipelineInfo.pViewportState = &viewportState;
    pipelineInfo.pRasterizationState = &rasterizer;
    pipelineInfo.pMultisampleState = &multisampling;
    pipelineInfo.pDepthStencilState = &depthStencil;
    pipelineInfo.pColorBlendState = &colorBlending;
    pipelineInfo.pDynamicState = nullptr;
    pipelineInfo.layout = pipelineLayout;
    pipelineInfo.renderPass = mRenderPass;
    pipelineInfo.subpass = 0;
    pipelineInfo.basePipelineHandle = VK_NULL_HANDLE; // Optional
    pipelineInfo.basePipelineIndex = -1; // Optional
 
 
    if (vkCreateGraphicsPipelines(mLogicalDevice, VK_NULL_HANDLE, 1, &pipelineInfo, nullptr, &pipeline) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create graphics pipeline!");
    }
    vkDestroyShaderModule(mLogicalDevice, fragShaderModule, nullptr);
    vkDestroyShaderModule(mLogicalDevice, vertShaderModule, nullptr);
    
    return std::pair<VkPipelineLayout, VkPipeline>(pipelineLayout, pipeline);
}
 
void VulkanRenderer::CreateDepthResources()
{
    VkFormat depthFormat = FindDepthFormat();
 
    CreateVulkanImage(mSwapChainExtent.width, mSwapChainExtent.height, 1, mMSAASamples, depthFormat,
        VK_IMAGE_TILING_OPTIMAL, VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT,
        mDepthImage, mDepthImageMemory);
    mDepthImageView = CreateImageView(mDepthImage, depthFormat, VK_IMAGE_ASPECT_DEPTH_BIT, 1);
}
 
void VulkanRenderer::CreateFramebuffers()
{
    mSwapChainFramebuffers.resize(mSwapChainImageViews.size());
 
    for (size_t i = 0; i < mSwapChainImageViews.size(); i++)
    {
        std::array<VkImageView, 3> attachments = { mColorImageView, mDepthImageView, mSwapChainImageViews[i] };
 
        VkFramebufferCreateInfo framebufferInfo{};
        framebufferInfo.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
        framebufferInfo.renderPass = mRenderPass;
        framebufferInfo.attachmentCount = static_cast<uint32_t>(attachments.size());
        framebufferInfo.pAttachments = attachments.data();
        framebufferInfo.width = mSwapChainExtent.width;
        framebufferInfo.height = mSwapChainExtent.height;
        framebufferInfo.layers = 1;
 
        if (vkCreateFramebuffer(mLogicalDevice, &framebufferInfo, nullptr, &mSwapChainFramebuffers[i]) != VK_SUCCESS)
        {
            throw std::runtime_error("failed to create framebuffer!");
        }
    }
}
 
void VulkanRenderer::CreateCommandBuffers()
{
    mCommandBuffers.resize(MAX_FRAMES_IN_FLIGHT);
 
    VkCommandBufferAllocateInfo allocInfo{};
    allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
    allocInfo.commandPool = mCommandPool;
    allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
    allocInfo.commandBufferCount = (uint32_t)mCommandBuffers.size();
 
    if (vkAllocateCommandBuffers(mLogicalDevice, &allocInfo, mCommandBuffers.data()) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to allocate command buffers!");
    }
}
 
void VulkanRenderer::CreateSyncObjects()
{
    mImageAvailableSemaphores.resize(MAX_FRAMES_IN_FLIGHT);
    mRenderFinishedSemaphores.resize(MAX_FRAMES_IN_FLIGHT);
    mInFlightFences.resize(MAX_FRAMES_IN_FLIGHT);
    mImagesInFlight.resize(mSwapChainImages.size(), VK_NULL_HANDLE);
 
    VkSemaphoreCreateInfo semaphoreInfo{};
    semaphoreInfo.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;
 
    VkFenceCreateInfo fenceInfo{};
    fenceInfo.sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO;
    fenceInfo.flags = VK_FENCE_CREATE_SIGNALED_BIT;
 
    for (size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++)
    {
        if (vkCreateSemaphore(mLogicalDevice, &semaphoreInfo, nullptr, &mImageAvailableSemaphores[i]) != VK_SUCCESS ||
            vkCreateSemaphore(mLogicalDevice, &semaphoreInfo, nullptr, &mRenderFinishedSemaphores[i]) != VK_SUCCESS ||
            vkCreateFence(mLogicalDevice, &fenceInfo, nullptr, &mInFlightFences[i]) != VK_SUCCESS)
        {
            throw std::runtime_error("failed to create synchronization objects for a frame!");
        }
    }
}
 
VkShaderModule VulkanRenderer::CreateShaderModule(std::vector<char>& code)
{
    VkShaderModuleCreateInfo createInfo{};
    createInfo.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
    createInfo.codeSize = code.size();
    createInfo.pCode = reinterpret_cast<const uint32_t*>(code.data());
 
    VkShaderModule shaderModule;
    if (vkCreateShaderModule(mLogicalDevice, &createInfo, nullptr, &shaderModule) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to create shader module!");
    }
 
    return shaderModule;
}
 
void VulkanRenderer::CleanupSwapChain()
{
    vkDestroyImageView(mLogicalDevice, mColorImageView, nullptr);
    vkDestroyImage(mLogicalDevice, mColorImage, nullptr);
    vkFreeMemory(mLogicalDevice, mColorImageMemory, nullptr);
 
    vkDestroyImageView(mLogicalDevice, mDepthImageView, nullptr);
    vkDestroyImage(mLogicalDevice, mDepthImage, nullptr);
    vkFreeMemory(mLogicalDevice, mDepthImageMemory, nullptr);
    for (auto framebuffer : mSwapChainFramebuffers)
    {
        vkDestroyFramebuffer(mLogicalDevice, framebuffer, nullptr);
    }
 
    vkFreeCommandBuffers(mLogicalDevice, mCommandPool, static_cast<uint32_t>(mCommandBuffers.size()), mCommandBuffers.data());
 
    vkDestroyRenderPass(mLogicalDevice, mRenderPass, nullptr);
    for (auto imageView : mSwapChainImageViews)
    {
        vkDestroyImageView(mLogicalDevice, imageView, nullptr);
    }
    vkDestroySwapchainKHR(mLogicalDevice, mSwapChain, nullptr);
}
 
void VulkanRenderer::RecordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t imageIndex)
{
    VkCommandBufferBeginInfo beginInfo{};
    beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
    //beginInfo.flags = 0; // Optional
    //beginInfo.pInheritanceInfo = nullptr; // Optional
 
    if (vkBeginCommandBuffer(commandBuffer, &beginInfo) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to begin recording command buffer!");
    }
 
    VkRenderPassBeginInfo renderPassInfo{};
    renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
    renderPassInfo.renderPass = mRenderPass;
    renderPassInfo.framebuffer = mSwapChainFramebuffers[imageIndex];
 
    renderPassInfo.renderArea.offset = { 0, 0 };
    renderPassInfo.renderArea.extent = mSwapChainExtent;
 
    std::array<VkClearValue, 2> clearValues{};
    clearValues[0].color = { {0.0f, 0.0f, 0.0f, 1.0f} };
    clearValues[1].depthStencil = { 1.0f, 0 };
    renderPassInfo.clearValueCount = static_cast<uint32_t>(clearValues.size());
    renderPassInfo.pClearValues = clearValues.data();
 
    vkCmdBeginRenderPass(commandBuffer, &renderPassInfo, VK_SUBPASS_CONTENTS_INLINE);
 
    vkCmdEndRenderPass(commandBuffer);
 
    if (vkEndCommandBuffer(commandBuffer) != VK_SUCCESS)
    {
        throw std::runtime_error("failed to record command buffer!");
    }
}
 
VkCommandBuffer VulkanRenderer::BeginSingleTimeCommand()
{
    VkCommandBufferAllocateInfo allocInfo{};
    allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
    allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
    allocInfo.commandPool = mCommandPool;
    allocInfo.commandBufferCount = 1;
 
    VkCommandBuffer commandBuffer;
    vkAllocateCommandBuffers(mLogicalDevice, &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);
 
    return commandBuffer;
}
 
bool VulkanRenderer::HasStencilComponent(VkFormat format)
{
    return format == VK_FORMAT_D32_SFLOAT_S8_UINT || format == VK_FORMAT_D24_UNORM_S8_UINT;
}
 
void VulkanRenderer::EndSingleTimeCommand(VkCommandBuffer commandBuffer)
{
    vkEndCommandBuffer(commandBuffer);
 
    VkSubmitInfo submitInfo{};
    submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
    submitInfo.commandBufferCount = 1;
    submitInfo.pCommandBuffers = &commandBuffer;
 
    vkQueueSubmit(mGraphicsQueue, 1, &submitInfo, VK_NULL_HANDLE);
    vkQueueWaitIdle(mGraphicsQueue);
 
    vkFreeCommandBuffers(mLogicalDevice, mCommandPool, 1, &commandBuffer);
}
 
template<typename T>
VkVertexInputBindingDescription VulkanRenderer::GetBindingDescription()
{
    VkVertexInputBindingDescription binding{};
    binding.binding = 0;
    binding.stride = sizeof(T);
    binding.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;
    return binding;
}
 
template<>
std::vector<VkVertexInputAttributeDescription> VulkanRenderer::GetAttributeDescriptions<Vertex2D>()
{
    std::vector<VkVertexInputAttributeDescription> attributeDescriptions{};
    attributeDescriptions.resize(3);
 
    attributeDescriptions[0].binding = 0;
    attributeDescriptions[0].location = 0;
    attributeDescriptions[0].format = VK_FORMAT_R32G32_SFLOAT;
    attributeDescriptions[0].offset = offsetof(Vertex2D, position);
 
    attributeDescriptions[1].binding = 0;
    attributeDescriptions[1].location = 1;
    attributeDescriptions[1].format = VK_FORMAT_R32G32B32A32_SFLOAT;
    attributeDescriptions[1].offset = offsetof(Vertex2D, color);
 
    attributeDescriptions[2].binding = 0;
    attributeDescriptions[2].location = 2;
    attributeDescriptions[2].format = VK_FORMAT_R32G32_SFLOAT;
    attributeDescriptions[2].offset = offsetof(Vertex2D, textureCoordinates);
 
    return attributeDescriptions;
}
 
template<>
std::vector<VkVertexInputAttributeDescription> VulkanRenderer::GetAttributeDescriptions<VertexPositionColorTexture>()
{
    std::vector<VkVertexInputAttributeDescription> attributeDescriptions{};
    attributeDescriptions.resize(3);
 
    attributeDescriptions[0].binding = 0;
    attributeDescriptions[0].location = 0;
    attributeDescriptions[0].format = VK_FORMAT_R32G32B32_SFLOAT;
    attributeDescriptions[0].offset = offsetof(VertexPositionColorTexture, position);
 
    attributeDescriptions[1].binding = 0;
    attributeDescriptions[1].location = 1;
    attributeDescriptions[1].format = VK_FORMAT_R32G32B32A32_SFLOAT;
    attributeDescriptions[1].offset = offsetof(VertexPositionColorTexture, color);
 
    attributeDescriptions[2].binding = 0;
    attributeDescriptions[2].location = 2;
    attributeDescriptions[2].format = VK_FORMAT_R32G32_SFLOAT;
    attributeDescriptions[2].offset = offsetof(VertexPositionColorTexture, textureCoordinates);
 
    return attributeDescriptions;
}
 
template<>
std::vector<VkVertexInputAttributeDescription> VulkanRenderer::GetAttributeDescriptions<VertexPositionColorTextureNormalTangent>()
{
    std::vector<VkVertexInputAttributeDescription> attributeDescriptions{};
    attributeDescriptions.resize(5);
 
    attributeDescriptions[0].binding = 0;
    attributeDescriptions[0].location = 0;
    attributeDescriptions[0].format = VK_FORMAT_R32G32B32_SFLOAT;
    attributeDescriptions[0].offset = offsetof(VertexPositionColorTextureNormalTangent, position);
 
    attributeDescriptions[1].binding = 0;
    attributeDescriptions[1].location = 1;
    attributeDescriptions[1].format = VK_FORMAT_R32G32B32A32_SFLOAT;
    attributeDescriptions[1].offset = offsetof(VertexPositionColorTextureNormalTangent, color);
 
    attributeDescriptions[2].binding = 0;
    attributeDescriptions[2].location = 2;
    attributeDescriptions[2].format = VK_FORMAT_R32G32_SFLOAT;
    attributeDescriptions[2].offset = offsetof(VertexPositionColorTextureNormalTangent, textureCoordinates);
 
    attributeDescriptions[3].binding = 0;
    attributeDescriptions[3].location = 3;
    attributeDescriptions[3].format = VK_FORMAT_R32G32B32_SFLOAT;
    attributeDescriptions[3].offset = offsetof(VertexPositionColorTextureNormalTangent, normal);
 
    attributeDescriptions[4].binding = 0;
    attributeDescriptions[4].location = 4;
    attributeDescriptions[4].format = VK_FORMAT_R32G32B32_SFLOAT;
    attributeDescriptions[4].offset = offsetof(VertexPositionColorTextureNormalTangent, tangent);
 
    return attributeDescriptions;
}
 
} //rendering_engine