Coral3D/src/vk_engine.cpp

#include "vk_engine.h"

#include <SDL.h>
#include <SDL_vulkan.h>

#include <vk_initializers.h>
#include <vk_pipelines.h>
#include <vk_images.h>

#define VMA_IMPLEMENTATION
#include <vk_mem_alloc.h>
#include <VkBootstrap.h>

// IMGUI
#include <imgui.h>
#include <imgui_impl_sdl2.h>
#include <imgui_impl_vulkan.h>

#include <chrono>
#include <thread>

VulkanEngine* loadedEngine = nullptr;
VulkanEngine& VulkanEngine::Get() { return *loadedEngine; }

#ifdef NDEBUG
constexpr bool bUseValidationLayers = false;
#else
constexpr bool bUseValidationLayers = true;
#endif

void VulkanEngine::init()
{
    // only one engine initialization is allowed with the application.
    assert(loadedEngine == nullptr);
    loadedEngine = this;

    // We initialize SDL and create a window with it.
    SDL_Init(SDL_INIT_VIDEO);

    SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_VULKAN);

    _window = SDL_CreateWindow(
        "Coral3D",
        SDL_WINDOWPOS_UNDEFINED,
        SDL_WINDOWPOS_UNDEFINED,
        _windowExtent.width,
        _windowExtent.height,
        window_flags);

    _mainDeletionQueue.push([&](){
        SDL_DestroyWindow(_window);
    });

    init_vulkan();

    init_swapchain();

    init_commands();

    init_sync_structures();

    init_descriptors();

    init_pipelines();

    init_imgui();

    // everything went fine
    _isInitialized = true;
}

void VulkanEngine::cleanup()
{
    if (_isInitialized)
    {
        // Wait for GPU
        vkDeviceWaitIdle(_device);

        // Cleanup frame data
        for (auto & frame : _frames)
        {
            frame._deletionQueue.flush();
        }

        _mainDeletionQueue.flush();
    }

    loadedEngine = nullptr;
}

void VulkanEngine::draw()
{
    // Wait for GPU to finish rendering last frame, timeout: 1 second
    VK_CHECK(vkWaitForFences(_device, 1, &get_current_frame()._renderFence, true, 1000000000));
    VK_CHECK(vkResetFences(_device, 1, &get_current_frame()._renderFence));

    get_current_frame()._deletionQueue.flush();

    // Request swapchain image
    uint32_t swapchainImageIndex;
    VK_CHECK(vkAcquireNextImageKHR(_device, _swapchain, 1000000000, get_current_frame()._swapchainSemaphore, nullptr,
                                   &swapchainImageIndex));

    // Get current frames command buffer
    VkCommandBuffer cmd = get_current_frame()._mainCommandBuffer;

    // Commands finished executing, reset command buffer
    VK_CHECK(vkResetCommandBuffer(cmd, 0));

    // Command buffer will be used exactly once
    VkCommandBufferBeginInfo cmdBeginInfo = vkinit::command_buffer_begin_info(VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT);

    _drawExtent.width = _drawImage.imageExtent.width;
    _drawExtent.height = _drawImage.imageExtent.height;

    // Begin recording
    VK_CHECK(vkBeginCommandBuffer(cmd, &cmdBeginInfo));

    // Transition draw image to general layout for writing into it
    vkutil::transition_image(cmd, _drawImage.image, VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_GENERAL);

    draw_clear_color(cmd);

    // Transition draw image and swapchain image to correct layout for transferring
    vkutil::transition_image(cmd, _drawImage.image, VK_IMAGE_LAYOUT_GENERAL, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL);
    vkutil::transition_image(cmd, _swapchainImages[swapchainImageIndex], VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL);

    // Copy draw image to swapchain image
    vkutil::copy_image_to_image(cmd, _drawImage.image, _swapchainImages[swapchainImageIndex], _drawExtent, _swapchainExtent);

    // Set swapchain image to Attachment Optimal, so we can directly draw to it
    vkutil::transition_image(cmd, _swapchainImages[swapchainImageIndex], VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);

    // Draw IMGUI into swapchain image
    draw_imgui(cmd, _swapchainImageViews[swapchainImageIndex]);

    // Transition swapchain image to presentable layout
    vkutil::transition_image(cmd, _swapchainImages[swapchainImageIndex], VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL, VK_IMAGE_LAYOUT_PRESENT_SRC_KHR);

    // End recording to command buffer
    VK_CHECK(vkEndCommandBuffer(cmd));

    // Wait for swapchain to be ready (_presentSemaphore)
    // Signal when rendering has finished (_renderSemaphore)
    VkCommandBufferSubmitInfo cmdInfo = vkinit::command_buffer_submit_info(cmd);

    VkSemaphoreSubmitInfo waitInfo = vkinit::semaphore_submit_info(VK_PIPELINE_STAGE_2_COLOR_ATTACHMENT_OUTPUT_BIT_KHR,get_current_frame()._swapchainSemaphore);
    VkSemaphoreSubmitInfo signalInfo = vkinit::semaphore_submit_info(VK_PIPELINE_STAGE_2_ALL_GRAPHICS_BIT, get_current_frame()._renderSemaphore);

    VkSubmitInfo2 submit = vkinit::submit_info(&cmdInfo, &signalInfo, &waitInfo);

    // Submit to queue and execute
    // Block until queue finishes execution (_renderFence)
    VK_CHECK(vkQueueSubmit2(_graphicsQueue, 1, &submit, get_current_frame()._renderFence));

    // Wait for drawing commands to have finished (_renderSemaphore)
    // Then display the image
    VkPresentInfoKHR presentInfo = {};
    presentInfo.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR;
    presentInfo.pNext = nullptr;
    presentInfo.pSwapchains = &_swapchain;
    presentInfo.swapchainCount = 1;

    presentInfo.pWaitSemaphores = &get_current_frame()._renderSemaphore;
    presentInfo.waitSemaphoreCount = 1;

    presentInfo.pImageIndices = &swapchainImageIndex;

    VK_CHECK(vkQueuePresentKHR(_graphicsQueue, &presentInfo));

    _frameNumber++;
}

void VulkanEngine::run()
{
    SDL_Event e;
    bool bQuit = false;

    while (!bQuit)
    {
        while (SDL_PollEvent(&e) != 0)
        {
            if (e.type == SDL_QUIT)
                bQuit = true;

            if (e.type == SDL_WINDOWEVENT)
            {
                if (e.window.event == SDL_WINDOWEVENT_MINIMIZED)
                {
                    _stopRendering = true;
                }
                if (e.window.event == SDL_WINDOWEVENT_RESTORED)
                {
                    _stopRendering = false;
                }
            }

            ImGui_ImplSDL2_ProcessEvent(&e);
        }

        // do not draw if we are minimized
        if (_stopRendering)
        {
            std::this_thread::sleep_for(std::chrono::milliseconds(100));
            continue;
        }

        // New IMGUI frame
        ImGui_ImplVulkan_NewFrame();
        ImGui_ImplSDL2_NewFrame(_window);
        ImGui::NewFrame();

        // Debug
        ImGui::ShowDemoWindow();

        // Render IMGUI
        ImGui::Render();

        draw();
    }
}

void VulkanEngine::init_vulkan()
{
    vkb::InstanceBuilder builder;

    auto inst_ret = builder.set_app_name("Coral3D")
            .request_validation_layers(bUseValidationLayers)
            .use_default_debug_messenger()
            .require_api_version(1, 3, 0)
            .build();

    vkb::Instance vkb_inst = inst_ret.value();

    _instance = vkb_inst.instance;
    _debugMessenger = vkb_inst.debug_messenger;

    SDL_Vulkan_CreateSurface(_window, _instance, &_surface);

    //vulkan 1.3 features
    VkPhysicalDeviceVulkan13Features features{};
    features.dynamicRendering = true;
    features.synchronization2 = true;

    //vulkan 1.2 features
    VkPhysicalDeviceVulkan12Features features12{};
    features12.bufferDeviceAddress = true;
    features12.descriptorIndexing = true;

    //use vkbootstrap to select a gpu.
    //We want a gpu that can write to the SDL surface and supports vulkan 1.3 with the correct features
    vkb::PhysicalDeviceSelector selector{ vkb_inst };
    vkb::PhysicalDevice physicalDevice = selector
            .set_minimum_version(1, 3)
            .set_required_features_13(features)
            .set_required_features_12(features12)
            .set_surface(_surface)
            .select()
            .value();


    //create the final vulkan device
    vkb::DeviceBuilder deviceBuilder{ physicalDevice };

    vkb::Device vkbDevice = deviceBuilder.build().value();

    // Get the VkDevice handle used in the rest of a vulkan application
    _device = vkbDevice.device;
    _physicalGPU = physicalDevice.physical_device;

    _graphicsQueue = vkbDevice.get_queue(vkb::QueueType::graphics).value();
    _graphicsQueueFamily = vkbDevice.get_queue_index(vkb::QueueType::graphics).value();

    // Initialize VMA
    VmaAllocatorCreateInfo allocInfo{};
    allocInfo.physicalDevice = _physicalGPU;
    allocInfo.device = _device;
    allocInfo.instance = _instance;
    allocInfo.flags = VMA_ALLOCATOR_CREATE_BUFFER_DEVICE_ADDRESS_BIT;
    vmaCreateAllocator(&allocInfo, &_allocator);

    _mainDeletionQueue.push([&](){
        vmaDestroyAllocator(_allocator);
        vkDestroySurfaceKHR(_instance, _surface, nullptr);

        vkDestroyDevice(_device, nullptr);
        vkb::destroy_debug_utils_messenger(_instance, _debugMessenger);
        vkDestroyInstance(_instance, nullptr);
    });
}

void VulkanEngine::init_swapchain()
{
    create_swapchain(_windowExtent.width, _windowExtent.height);

    // Create draw image
    _drawImage.imageFormat = VK_FORMAT_R16G16B16A16_SFLOAT;
    _drawImage.imageExtent = {
            _windowExtent.width,
            _windowExtent.height,
            1
    };;

    VkImageUsageFlags drawImageUsages{};
    drawImageUsages |= VK_IMAGE_USAGE_TRANSFER_SRC_BIT;
    drawImageUsages |= VK_IMAGE_USAGE_TRANSFER_DST_BIT;
    drawImageUsages |= VK_IMAGE_USAGE_STORAGE_BIT;
    drawImageUsages |= VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;

    VkImageCreateInfo imgCI = vkinit::image_create_info(_drawImage.imageFormat, drawImageUsages,
                                                          _drawImage.imageExtent);

    // Allocate the draw image from device (GPU) local memory
    VmaAllocationCreateInfo imgAllocCI{};
    imgAllocCI.usage = VMA_MEMORY_USAGE_GPU_ONLY;
    imgAllocCI.requiredFlags = VkMemoryPropertyFlags(VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);

    // Allocate image
    vmaCreateImage(_allocator, &imgCI, &imgAllocCI, &_drawImage.image, &_drawImage.allocation, nullptr);

    // Build image view for draw image
    VkImageViewCreateInfo imgViewCI = vkinit::imageview_create_info(_drawImage.imageFormat, _drawImage.image,
                                                                    VK_IMAGE_ASPECT_COLOR_BIT);

    VK_CHECK(vkCreateImageView(_device, &imgViewCI, nullptr, &_drawImage.imageView));

    _mainDeletionQueue.push([=, this](){
        vkDestroyImageView(_device, _drawImage.imageView, nullptr);
        vmaDestroyImage(_allocator, _drawImage.image, _drawImage.allocation);
    });
}

void VulkanEngine::init_commands()
{
    // Create command pool for commands submitted to the graphics queue
    // and allow resetting individual command buffers;
    VkCommandPoolCreateInfo commandPoolInfo
    {
        vkinit::command_pool_create_info(_graphicsQueueFamily,
                                         VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT)
    };

    // Initialize immediate buffer
    VK_CHECK(vkCreateCommandPool(_device, &commandPoolInfo, nullptr, &_immediateBuffer._commandPool));

    VkCommandBufferAllocateInfo immCmdAllocInfo
    {
        vkinit::command_buffer_allocate_info(_immediateBuffer._commandPool,1)
    };
    VK_CHECK(vkAllocateCommandBuffers(_device, &immCmdAllocInfo, &_immediateBuffer._commandBuffer));

    _mainDeletionQueue.push([=, this]() {
        vkDestroyCommandPool(_device, _immediateBuffer._commandPool, nullptr);
    });

        for (auto & frame : _frames)
    {
        VK_CHECK(vkCreateCommandPool(_device, &commandPoolInfo, nullptr, &frame._commandPool));

        // Allocate default command buffer used for rendering
        VkCommandBufferAllocateInfo cmdAllocInfo {vkinit::command_buffer_allocate_info(frame._commandPool, 1)};

        VK_CHECK(vkAllocateCommandBuffers(_device, &cmdAllocInfo, &frame._mainCommandBuffer));

        _mainDeletionQueue.push([=, this](){
            vkDestroyCommandPool(_device, frame._commandPool, nullptr);
        });
    }
}

void VulkanEngine::init_sync_structures()
{
    // Fence is used to not record into cmd buffer that is being rendered
    // and 2 semaphores to synchronize rendering with swapchain.
    // Fence start signaled to be able to wait on it in the first frame.
    VkFenceCreateInfo fenceCreateInfo = vkinit::fence_create_info(VK_FENCE_CREATE_SIGNALED_BIT);
    VkSemaphoreCreateInfo semaphoreCreateInfo = vkinit::semaphore_create_info();

    VK_CHECK(vkCreateFence(_device, &fenceCreateInfo, nullptr, &_immediateBuffer._fence));

    _mainDeletionQueue.push([=, this](){
        vkDestroyFence(_device, _immediateBuffer._fence, nullptr);
    });

    for (auto & frame : _frames)
    {
        VK_CHECK(vkCreateFence(_device, &fenceCreateInfo, nullptr, &frame._renderFence));

        VK_CHECK(vkCreateSemaphore(_device, &semaphoreCreateInfo, nullptr, &frame._swapchainSemaphore));
        VK_CHECK(vkCreateSemaphore(_device, &semaphoreCreateInfo, nullptr, &frame._renderSemaphore));

        // Deletion queue
        _mainDeletionQueue.push([=, this](){
            vkDestroyFence(_device, frame._renderFence, nullptr);
            vkDestroySemaphore(_device, frame._renderSemaphore, nullptr);
            vkDestroySemaphore(_device, frame._swapchainSemaphore, nullptr);
        });
    }
}

void VulkanEngine::create_swapchain(uint32_t width, uint32_t height)
{
    vkb::SwapchainBuilder swapchainBuilder{ _physicalGPU,_device,_surface };

    _swapchainImageFormat = VK_FORMAT_B8G8R8A8_UNORM;

    vkb::Swapchain vkbSwapchain = swapchainBuilder
            .set_desired_format(VkSurfaceFormatKHR
                { .format = _swapchainImageFormat, .colorSpace = VK_COLOR_SPACE_SRGB_NONLINEAR_KHR })
            .set_desired_present_mode(VK_PRESENT_MODE_FIFO_KHR) // VSync present mode
            .set_desired_extent(width, height)
            .add_image_usage_flags(VK_IMAGE_USAGE_TRANSFER_DST_BIT)
            .build()
            .value();

    _swapchainExtent = vkbSwapchain.extent;

    // Store swapchain and its images
    _swapchain = vkbSwapchain.swapchain;
    _swapchainImages = vkbSwapchain.get_images().value();
    _swapchainImageViews = vkbSwapchain.get_image_views().value();

    _mainDeletionQueue.push([=, this](){
        vkDestroySwapchainKHR(_device, _swapchain, nullptr);
        for (int i = 0; i < _swapchainImageViews.size(); ++i)
        {
            vkDestroyImageView(_device, _swapchainImageViews[i], nullptr);
        }
    });
}

void VulkanEngine::draw_clear_color(VkCommandBuffer cmd)
{
    // bind the gradient drawing compute pipeline
    vkCmdBindPipeline(cmd, VK_PIPELINE_BIND_POINT_COMPUTE, _computePipeline);

    // bind the descriptor set containing the draw image for the compute pipeline
    vkCmdBindDescriptorSets(cmd, VK_PIPELINE_BIND_POINT_COMPUTE, _computePipelineLayout, 0, 1, &_drawImageDescriptors, 0, nullptr);

    // execute the compute pipeline dispatch. We are using 16x16 workgroup size so we need to divide by it
    vkCmdDispatch(cmd, std::ceil(_drawExtent.width / 16.0), std::ceil(_drawExtent.height / 16.0), 1);
}

void VulkanEngine::init_descriptors()
{
    std::vector<DescriptorAllocator::PoolSizeRatio> sizes
            {
                    {VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, 1}
            };

    _globalDescriptorAllocator.init_pool(_device, 10, sizes);

    {
        DescriptorLayoutBuilder layoutBuilder;
        layoutBuilder.add_binding(0, VK_DESCRIPTOR_TYPE_STORAGE_IMAGE);
        _drawImageDescriptorLayout = layoutBuilder.build(_device, VK_SHADER_STAGE_COMPUTE_BIT);
    }

    // Allocate descriptor for draw image
    _drawImageDescriptors = _globalDescriptorAllocator.allocate(_device, _drawImageDescriptorLayout);

    // The DescImageInfo holds a "pointer" to the resource that will get bound to the descriptor
    VkDescriptorImageInfo imgInfo
    {
        .imageView = _drawImage.imageView,
        .imageLayout = VK_IMAGE_LAYOUT_GENERAL
    };

    // A write is used to "write" the resource into the descriptor set
    VkWriteDescriptorSet drawImageWrite
    {
        .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
        .pNext = nullptr,

        .dstSet = _drawImageDescriptors,
        .dstBinding = 0,
        .descriptorCount = 1,
        .descriptorType = VK_DESCRIPTOR_TYPE_STORAGE_IMAGE,
        .pImageInfo = &imgInfo
    };

    vkUpdateDescriptorSets(_device, 1, &drawImageWrite, 0, nullptr);

    _mainDeletionQueue.push([&](){
       _globalDescriptorAllocator.destroy_pool(_device);
        vkDestroyDescriptorSetLayout(_device, _drawImageDescriptorLayout, nullptr);
    });
}

void VulkanEngine::init_pipelines()
{
    init_background_pipelines();
}

void VulkanEngine::init_background_pipelines()
{
    VkPipelineLayoutCreateInfo computeLayout{};
    computeLayout.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
    computeLayout.pNext = nullptr;
    computeLayout.pSetLayouts = &_drawImageDescriptorLayout;
    computeLayout.setLayoutCount = 1;

    VK_CHECK(vkCreatePipelineLayout(_device, &computeLayout, nullptr, &_computePipelineLayout));

    VkShaderModule computeDrawShader;
    if (!vkutil::load_shader_module("../shaders/gradient.comp.spv", _device, &computeDrawShader))
    {
        fmt::print("Error when building the compute shader \n");
    }

    VkPipelineShaderStageCreateInfo stageinfo{};
    stageinfo.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
    stageinfo.pNext = nullptr;
    stageinfo.stage = VK_SHADER_STAGE_COMPUTE_BIT;
    stageinfo.module = computeDrawShader;
    stageinfo.pName = "main";

    VkComputePipelineCreateInfo computePipelineCreateInfo{};
    computePipelineCreateInfo.sType = VK_STRUCTURE_TYPE_COMPUTE_PIPELINE_CREATE_INFO;
    computePipelineCreateInfo.pNext = nullptr;
    computePipelineCreateInfo.layout = _computePipelineLayout;
    computePipelineCreateInfo.stage = stageinfo;

    VK_CHECK(vkCreateComputePipelines(_device,VK_NULL_HANDLE,1,&computePipelineCreateInfo, nullptr, &_computePipeline));

    vkDestroyShaderModule(_device, computeDrawShader, nullptr);

    _mainDeletionQueue.push([&]() {
        vkDestroyPipelineLayout(_device, _computePipelineLayout, nullptr);
        vkDestroyPipeline(_device, _computePipeline, nullptr);
    });
}

void VulkanEngine::draw_imgui(VkCommandBuffer cmd, VkImageView targetImageView)
{
    VkRenderingAttachmentInfo colorAttachment = vkinit::attachment_info(targetImageView, nullptr, VK_IMAGE_LAYOUT_GENERAL);
    VkRenderingInfo renderInfo = vkinit::rendering_info(_swapchainExtent, &colorAttachment, nullptr);

    vkCmdBeginRendering(cmd, &renderInfo);

    ImGui_ImplVulkan_RenderDrawData(ImGui::GetDrawData(), cmd);

    vkCmdEndRendering(cmd);
}

void VulkanEngine::immediate_submit(std::function<void(VkCommandBuffer)> &&function)
{
    VK_CHECK(vkResetFences(_device, 1, &_immediateBuffer._fence));
    VK_CHECK(vkResetCommandBuffer(_immediateBuffer._commandBuffer, 0));

    VkCommandBuffer cmd = _immediateBuffer._commandBuffer;

    VkCommandBufferBeginInfo cmdBeginInfo = vkinit::command_buffer_begin_info(VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT);

    VK_CHECK(vkBeginCommandBuffer(cmd, &cmdBeginInfo));

    function(cmd);

    VK_CHECK(vkEndCommandBuffer(cmd));

    VkCommandBufferSubmitInfo cmdinfo = vkinit::command_buffer_submit_info(cmd);
    VkSubmitInfo2 submit = vkinit::submit_info(&cmdinfo, nullptr, nullptr);


    // Submit and execute command buffer
    VK_CHECK(vkQueueSubmit2(_graphicsQueue, 1, &submit, _immediateBuffer._fence));

    // _fence will block until graphic commands execution have finished execution
    VK_CHECK(vkWaitForFences(_device, 1, &_immediateBuffer._fence, true, 9999999999));
}

void VulkanEngine::init_imgui()
{
    // Create descriptor pool used by IMGUI
    // Pool size is oversize but as provided by imgui demo
    VkDescriptorPoolSize pool_sizes[] = { { VK_DESCRIPTOR_TYPE_SAMPLER, 1000 },
                                          { VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1000 },
                                          { VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, 1000 },
                                          { VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, 1000 },
                                          { VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER, 1000 },
                                          { VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, 1000 },
                                          { VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 1000 },
                                          { VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, 1000 },
                                          { VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC, 1000 },
                                          { VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC, 1000 },
                                          { VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, 1000 } };

    VkDescriptorPoolCreateInfo pool_info = {};
    pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
    pool_info.flags = VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT;
    pool_info.maxSets = 1000;
    pool_info.poolSizeCount = (uint32_t)std::size(pool_sizes);
    pool_info.pPoolSizes = pool_sizes;

    VkDescriptorPool imguiPool;
    VK_CHECK(vkCreateDescriptorPool(_device, &pool_info, nullptr, &imguiPool));


    // Initialize IMGUI structures
    ImGui::CreateContext();

    // Initialize IMGUI for SDL
    ImGui_ImplSDL2_InitForVulkan(_window);

    // Initialize IMGUI for Vulkan
    ImGui_ImplVulkan_InitInfo init_info = {};
    init_info.Instance = _instance;
    init_info.PhysicalDevice = _physicalGPU;
    init_info.Device = _device;
    init_info.Queue = _graphicsQueue;
    init_info.DescriptorPool = imguiPool;
    init_info.MinImageCount = 3;
    init_info.ImageCount = 3;
    init_info.UseDynamicRendering = true;
    init_info.ColorAttachmentFormat = _swapchainImageFormat;

    init_info.MSAASamples = VK_SAMPLE_COUNT_1_BIT;

    ImGui_ImplVulkan_Init(&init_info, VK_NULL_HANDLE);

    // Upload font textures to GPU
    immediate_submit([&](VkCommandBuffer cmd) { ImGui_ImplVulkan_CreateFontsTexture(cmd); });

    // Clear font textures from CPU
    ImGui_ImplVulkan_DestroyFontUploadObjects();

    _mainDeletionQueue.push([=, this]() {
        vkDestroyDescriptorPool(_device, imguiPool, nullptr);
        ImGui_ImplVulkan_Shutdown();
    });
}