687 lines
26 KiB
C++
687 lines
26 KiB
C++
#pragma once
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#include <vulkan/vulkan.h>
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#include <SDL.h>
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#include <SDL_vulkan.h>
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#include <imgui.h>
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#include <backends/imgui_impl_sdl2.h>
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#include <backends/imgui_impl_vulkan.h>
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#include <iostream>
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#include <vector>
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#include <stdexcept>
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class MinimalImGuiVulkan {
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public:
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/* run application; borrows calling thread for event loop,
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* until application exit
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*/
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void run();
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private:
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void init_window() {
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if (SDL_Init(SDL_INIT_VIDEO) != 0) {
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throw std::runtime_error("Failed to initialize SDL!");
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}
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this->window_ = SDL_CreateWindow(
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"ImGui Vulkan SDL2 Example",
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SDL_WINDOWPOS_CENTERED,
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SDL_WINDOWPOS_CENTERED,
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800, 600,
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SDL_WINDOW_VULKAN | SDL_WINDOW_RESIZABLE
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);
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if (!window_) {
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throw std::runtime_error("Failed to create SDL window!");
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}
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}
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void init_vulkan() {
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createInstance();
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createSurface();
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pickPhysicalDevice();
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createLogicalDevice();
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this->createSwapchain();
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this->createImageViews();
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this->createRenderPass(); // must come before createFrameBuffers
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this->createFramebuffers();
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createCommandPool();
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createCommandBuffers();
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createSyncObjects();
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createDescriptorPool();
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}
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void createInstance() {
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VkApplicationInfo appInfo{};
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appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
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appInfo.pApplicationName = "ImGui Vulkan App";
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appInfo.applicationVersion = VK_MAKE_VERSION(1, 0, 0);
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appInfo.pEngineName = "No Engine";
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appInfo.engineVersion = VK_MAKE_VERSION(1, 0, 0);
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appInfo.apiVersion = VK_API_VERSION_1_0;
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VkInstanceCreateInfo createInfo{};
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createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
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createInfo.pApplicationInfo = &appInfo;
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uint32_t extensionCount = 0;
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if (!SDL_Vulkan_GetInstanceExtensions(window_, &extensionCount, nullptr)) {
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throw std::runtime_error("Failed to get SDL Vulkan extensions!");
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}
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std::vector<const char*> extensions(extensionCount);
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if (!SDL_Vulkan_GetInstanceExtensions(window_, &extensionCount, extensions.data())) {
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throw std::runtime_error("Failed to get SDL Vulkan extensions!");
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}
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#ifdef __apple__
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// Add portability extension for MoltenVK (macOS)
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extensions.push_back(VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME);
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#endif
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createInfo.enabledExtensionCount = extensions.size();
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createInfo.ppEnabledExtensionNames = extensions.data();
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createInfo.enabledLayerCount = 0;
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#ifdef __apple__
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// CRITICAL: Enable portability enumeration flag for MoltenVK
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createInfo.flags |= VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR;
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#endif
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int result = vkCreateInstance(&createInfo, nullptr, &(this->instance_));
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if (result != VK_SUCCESS) {
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printf("vkCreateInstance failed with error: %d\n", result);
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throw std::runtime_error("Failed to create instance!");
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}
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}
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void createSurface() {
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if (!SDL_Vulkan_CreateSurface(window_, instance_, &surface)) {
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throw std::runtime_error("Failed to create SDL Vulkan surface!");
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}
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}
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void pickPhysicalDevice() {
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uint32_t deviceCount = 0;
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vkEnumeratePhysicalDevices(instance_, &deviceCount, nullptr);
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if (deviceCount == 0) {
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throw std::runtime_error("Failed to find GPUs with Vulkan support!");
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}
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std::vector<VkPhysicalDevice> devices(deviceCount);
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vkEnumeratePhysicalDevices(instance_, &deviceCount, devices.data());
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this->physical_device_ = devices[0]; // Just pick the first one for simplicity
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// Find graphics queue family
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uint32_t queueFamilyCount = 0;
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vkGetPhysicalDeviceQueueFamilyProperties(physical_device_, &queueFamilyCount, nullptr);
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std::vector<VkQueueFamilyProperties> queueFamilies(queueFamilyCount);
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vkGetPhysicalDeviceQueueFamilyProperties(physical_device_, &queueFamilyCount, queueFamilies.data());
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for (uint32_t i = 0; i < queueFamilies.size(); i++) {
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if (queueFamilies[i].queueFlags & VK_QUEUE_GRAPHICS_BIT) {
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VkBool32 presentSupport = false;
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vkGetPhysicalDeviceSurfaceSupportKHR(physical_device_, i, surface, &presentSupport);
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if (presentSupport) {
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graphicsQueueFamily = i;
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break;
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}
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}
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}
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}
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void createLogicalDevice() {
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VkDeviceQueueCreateInfo queueCreateInfo{};
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queueCreateInfo.sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO;
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queueCreateInfo.queueFamilyIndex = graphicsQueueFamily;
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queueCreateInfo.queueCount = 1;
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float queuePriority = 1.0f;
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queueCreateInfo.pQueuePriorities = &queuePriority;
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VkPhysicalDeviceFeatures deviceFeatures{};
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VkDeviceCreateInfo createInfo{};
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createInfo.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO;
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createInfo.pQueueCreateInfos = &queueCreateInfo;
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createInfo.queueCreateInfoCount = 1;
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createInfo.pEnabledFeatures = &deviceFeatures;
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const char* deviceExtensions[] = { VK_KHR_SWAPCHAIN_EXTENSION_NAME };
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createInfo.enabledExtensionCount = 1;
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createInfo.ppEnabledExtensionNames = deviceExtensions;
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if (vkCreateDevice(physical_device_, &createInfo, nullptr, &device) != VK_SUCCESS) {
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throw std::runtime_error("Failed to create logical device!");
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}
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vkGetDeviceQueue(device, graphicsQueueFamily, 0, &graphicsQueue);
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}
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void createSwapchain() {
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VkSurfaceCapabilitiesKHR capabilities;
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vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physical_device_, surface, &capabilities);
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uint32_t formatCount;
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vkGetPhysicalDeviceSurfaceFormatsKHR(physical_device_, surface, &formatCount, nullptr);
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std::vector<VkSurfaceFormatKHR> formats(formatCount);
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vkGetPhysicalDeviceSurfaceFormatsKHR(physical_device_, surface, &formatCount, formats.data());
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VkSurfaceFormatKHR surfaceFormat = formats[0];
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swapchainImageFormat = surfaceFormat.format;
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int width, height;
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SDL_Vulkan_GetDrawableSize(window_, &width, &height);
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swapchainExtent = {static_cast<uint32_t>(width), static_cast<uint32_t>(height)};
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uint32_t imageCount = capabilities.minImageCount + 1;
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if (capabilities.maxImageCount > 0 && imageCount > capabilities.maxImageCount) {
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imageCount = capabilities.maxImageCount;
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}
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VkSwapchainCreateInfoKHR createInfo{};
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createInfo.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
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createInfo.surface = surface;
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createInfo.minImageCount = imageCount;
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createInfo.imageFormat = surfaceFormat.format;
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createInfo.imageColorSpace = surfaceFormat.colorSpace;
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createInfo.imageExtent = swapchainExtent;
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createInfo.imageArrayLayers = 1;
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createInfo.imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
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createInfo.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
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createInfo.preTransform = capabilities.currentTransform;
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createInfo.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
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createInfo.presentMode = VK_PRESENT_MODE_FIFO_KHR;
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createInfo.clipped = VK_TRUE;
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if (vkCreateSwapchainKHR(device, &createInfo, nullptr, &swapchain) != VK_SUCCESS) {
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throw std::runtime_error("Failed to create swap chain!");
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}
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vkGetSwapchainImagesKHR(device, swapchain, &imageCount, nullptr);
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swapchainImages.resize(imageCount);
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vkGetSwapchainImagesKHR(device, swapchain, &imageCount, swapchainImages.data());
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}
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void createImageViews() {
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swapchainImageViews.resize(swapchainImages.size());
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for (size_t i = 0; i < swapchainImages.size(); i++) {
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VkImageViewCreateInfo createInfo{};
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createInfo.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
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createInfo.image = swapchainImages[i];
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createInfo.viewType = VK_IMAGE_VIEW_TYPE_2D;
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createInfo.format = swapchainImageFormat;
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createInfo.components.r = VK_COMPONENT_SWIZZLE_IDENTITY;
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createInfo.components.g = VK_COMPONENT_SWIZZLE_IDENTITY;
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createInfo.components.b = VK_COMPONENT_SWIZZLE_IDENTITY;
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createInfo.components.a = VK_COMPONENT_SWIZZLE_IDENTITY;
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createInfo.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
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createInfo.subresourceRange.baseMipLevel = 0;
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createInfo.subresourceRange.levelCount = 1;
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createInfo.subresourceRange.baseArrayLayer = 0;
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createInfo.subresourceRange.layerCount = 1;
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if (vkCreateImageView(device, &createInfo, nullptr, &swapchainImageViews[i]) != VK_SUCCESS) {
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throw std::runtime_error("Failed to create image views!");
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}
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}
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}
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void createRenderPass() {
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VkAttachmentDescription colorAttachment{};
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colorAttachment.format = swapchainImageFormat;
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colorAttachment.samples = VK_SAMPLE_COUNT_1_BIT;
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colorAttachment.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
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colorAttachment.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
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colorAttachment.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
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colorAttachment.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
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colorAttachment.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
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colorAttachment.finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;
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VkAttachmentReference colorAttachmentRef{};
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colorAttachmentRef.attachment = 0;
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colorAttachmentRef.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
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VkSubpassDescription subpass{};
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subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
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subpass.colorAttachmentCount = 1;
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subpass.pColorAttachments = &colorAttachmentRef;
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VkSubpassDependency dependency{};
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dependency.srcSubpass = VK_SUBPASS_EXTERNAL;
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dependency.dstSubpass = 0;
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dependency.srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
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dependency.srcAccessMask = 0;
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dependency.dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
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dependency.dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
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VkRenderPassCreateInfo renderPassInfo{};
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renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
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renderPassInfo.attachmentCount = 1;
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renderPassInfo.pAttachments = &colorAttachment;
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renderPassInfo.subpassCount = 1;
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renderPassInfo.pSubpasses = &subpass;
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renderPassInfo.dependencyCount = 1;
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renderPassInfo.pDependencies = &dependency;
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if (vkCreateRenderPass(device, &renderPassInfo, nullptr, &renderPass) != VK_SUCCESS) {
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throw std::runtime_error("Failed to create render pass!");
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}
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}
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void createFramebuffers() {
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framebuffers.resize(swapchainImageViews.size());
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for (size_t i = 0; i < swapchainImageViews.size(); i++) {
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VkImageView attachments[] = { swapchainImageViews[i] };
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VkFramebufferCreateInfo framebufferInfo{};
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framebufferInfo.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
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framebufferInfo.renderPass = renderPass;
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framebufferInfo.attachmentCount = 1;
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framebufferInfo.pAttachments = attachments;
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framebufferInfo.width = swapchainExtent.width;
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framebufferInfo.height = swapchainExtent.height;
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framebufferInfo.layers = 1;
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if (vkCreateFramebuffer(device, &framebufferInfo, nullptr, &framebuffers[i]) != VK_SUCCESS) {
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throw std::runtime_error("Failed to create framebuffer!");
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}
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}
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}
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void createCommandPool() {
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VkCommandPoolCreateInfo poolInfo{};
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poolInfo.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
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poolInfo.flags = VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT;
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poolInfo.queueFamilyIndex = graphicsQueueFamily;
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if (vkCreateCommandPool(device, &poolInfo, nullptr, &commandPool) != VK_SUCCESS) {
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throw std::runtime_error("Failed to create command pool!");
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}
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}
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void createCommandBuffers() {
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commandBuffers.resize(MAX_FRAMES_IN_FLIGHT);
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VkCommandBufferAllocateInfo allocInfo{};
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allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
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allocInfo.commandPool = commandPool;
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allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
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allocInfo.commandBufferCount = static_cast<uint32_t>(commandBuffers.size());
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if (vkAllocateCommandBuffers(device, &allocInfo, commandBuffers.data()) != VK_SUCCESS) {
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throw std::runtime_error("Failed to allocate command buffers!");
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}
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}
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void createSyncObjects() {
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imageAvailableSemaphores.resize(MAX_FRAMES_IN_FLIGHT);
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renderFinishedSemaphores.resize(MAX_FRAMES_IN_FLIGHT);
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inFlightFences.resize(MAX_FRAMES_IN_FLIGHT);
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VkSemaphoreCreateInfo semaphoreInfo{};
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semaphoreInfo.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;
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VkFenceCreateInfo fenceInfo{};
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fenceInfo.sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO;
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fenceInfo.flags = VK_FENCE_CREATE_SIGNALED_BIT;
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for (size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++) {
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if (vkCreateSemaphore(device, &semaphoreInfo, nullptr, &imageAvailableSemaphores[i]) != VK_SUCCESS ||
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vkCreateSemaphore(device, &semaphoreInfo, nullptr, &renderFinishedSemaphores[i]) != VK_SUCCESS ||
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vkCreateFence(device, &fenceInfo, nullptr, &inFlightFences[i]) != VK_SUCCESS) {
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throw std::runtime_error("Failed to create synchronization objects!");
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}
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}
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}
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void createDescriptorPool() {
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VkDescriptorPoolSize pool_sizes[] = {
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{ VK_DESCRIPTOR_TYPE_SAMPLER, 1000 },
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{ VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1000 },
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{ VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, 1000 },
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{ VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, 1000 },
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{ VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER, 1000 },
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{ VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, 1000 },
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{ VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 1000 },
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{ VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, 1000 },
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{ VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC, 1000 },
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{ VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC, 1000 },
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{ VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, 1000 }
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};
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VkDescriptorPoolCreateInfo pool_info = {};
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pool_info.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
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pool_info.flags = VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT;
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pool_info.maxSets = 1000 * IM_ARRAYSIZE(pool_sizes);
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pool_info.poolSizeCount = (uint32_t)IM_ARRAYSIZE(pool_sizes);
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pool_info.pPoolSizes = pool_sizes;
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if (vkCreateDescriptorPool(device, &pool_info, nullptr, &descriptorPool) != VK_SUCCESS) {
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throw std::runtime_error("Failed to create descriptor pool!");
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}
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}
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void init_imgui() {
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// Setup Dear ImGui context
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IMGUI_CHECKVERSION();
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ImGui::CreateContext();
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ImGuiIO& io = ImGui::GetIO(); (void)io;
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// Setup Dear ImGui style
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ImGui::StyleColorsDark();
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// Setup Platform/Renderer backends
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ImGui_ImplSDL2_InitForVulkan(window_);
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ImGui_ImplVulkan_InitInfo init_info = {};
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init_info.Instance = instance_;
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init_info.PhysicalDevice = physical_device_;
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init_info.Device = device;
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init_info.QueueFamily = graphicsQueueFamily;
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init_info.Queue = graphicsQueue;
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init_info.PipelineCache = VK_NULL_HANDLE;
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init_info.DescriptorPool = descriptorPool;
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init_info.RenderPass = renderPass;
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init_info.Subpass = 0;
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init_info.MinImageCount = MAX_FRAMES_IN_FLIGHT;
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init_info.ImageCount = static_cast<uint32_t>(swapchainImages.size());
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init_info.MSAASamples = VK_SAMPLE_COUNT_1_BIT;
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init_info.Allocator = nullptr;
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init_info.CheckVkResultFn = nullptr;
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ImGui_ImplVulkan_Init(&init_info);
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//ImGui_ImplVulkan_Init(&init_info, renderPass);
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// Upload Fonts
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VkCommandBuffer command_buffer = beginSingleTimeCommands();
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ImGui_ImplVulkan_CreateFontsTexture();
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endSingleTimeCommands(command_buffer);
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//ImGui_ImplVulkan_DestroyFontUploadObjects();
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}
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VkCommandBuffer beginSingleTimeCommands() {
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VkCommandBufferAllocateInfo allocInfo{};
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allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
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allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
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allocInfo.commandPool = commandPool;
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allocInfo.commandBufferCount = 1;
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VkCommandBuffer commandBuffer;
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vkAllocateCommandBuffers(device, &allocInfo, &commandBuffer);
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VkCommandBufferBeginInfo beginInfo{};
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beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
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beginInfo.flags = VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT;
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vkBeginCommandBuffer(commandBuffer, &beginInfo);
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return commandBuffer;
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}
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void endSingleTimeCommands(VkCommandBuffer commandBuffer) {
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vkEndCommandBuffer(commandBuffer);
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VkSubmitInfo submitInfo{};
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submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
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submitInfo.commandBufferCount = 1;
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submitInfo.pCommandBuffers = &commandBuffer;
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vkQueueSubmit(graphicsQueue, 1, &submitInfo, VK_NULL_HANDLE);
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vkQueueWaitIdle(graphicsQueue);
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vkFreeCommandBuffers(device, commandPool, 1, &commandBuffer);
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}
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void main_loop() {
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SDL_Event event;
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while (!quit) {
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while (SDL_PollEvent(&event)) {
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ImGui_ImplSDL2_ProcessEvent(&event);
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if (event.type == SDL_QUIT) {
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quit = true;
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}
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}
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drawFrame();
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}
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vkDeviceWaitIdle(device);
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}
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void drawFrame() {
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vkWaitForFences(device, 1, &inFlightFences[currentFrame], VK_TRUE, UINT64_MAX);
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uint32_t imageIndex;
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VkResult result = vkAcquireNextImageKHR(device, swapchain, UINT64_MAX,
|
|
imageAvailableSemaphores[currentFrame],
|
|
VK_NULL_HANDLE, &imageIndex);
|
|
|
|
switch (result) {
|
|
case VK_SUCCESS:
|
|
case VK_SUBOPTIMAL_KHR:
|
|
break;
|
|
case VK_ERROR_OUT_OF_DATE_KHR:
|
|
recreateSwapchain();
|
|
// deliberate earlyexit
|
|
return;
|
|
default:
|
|
throw std::runtime_error("failed to acquire swapchain image!");
|
|
break;
|
|
}
|
|
|
|
vkResetFences(device, 1, &inFlightFences[currentFrame]);
|
|
|
|
vkResetCommandBuffer(commandBuffers[currentFrame], 0);
|
|
recordCommandBuffer(commandBuffers[currentFrame], imageIndex);
|
|
|
|
VkSubmitInfo submitInfo{};
|
|
submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
|
|
|
|
VkSemaphore waitSemaphores[] = {imageAvailableSemaphores[currentFrame]};
|
|
VkPipelineStageFlags waitStages[] = {VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT};
|
|
submitInfo.waitSemaphoreCount = 1;
|
|
submitInfo.pWaitSemaphores = waitSemaphores;
|
|
submitInfo.pWaitDstStageMask = waitStages;
|
|
|
|
submitInfo.commandBufferCount = 1;
|
|
submitInfo.pCommandBuffers = &commandBuffers[currentFrame];
|
|
|
|
VkSemaphore signalSemaphores[] = {renderFinishedSemaphores[currentFrame]};
|
|
submitInfo.signalSemaphoreCount = 1;
|
|
submitInfo.pSignalSemaphores = signalSemaphores;
|
|
|
|
if (vkQueueSubmit(graphicsQueue, 1, &submitInfo, inFlightFences[currentFrame]) != VK_SUCCESS) {
|
|
throw std::runtime_error("Failed to submit draw command buffer!");
|
|
}
|
|
|
|
VkPresentInfoKHR presentInfo{};
|
|
presentInfo.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR;
|
|
|
|
presentInfo.waitSemaphoreCount = 1;
|
|
presentInfo.pWaitSemaphores = signalSemaphores;
|
|
|
|
VkSwapchainKHR swapChains[] = {swapchain};
|
|
presentInfo.swapchainCount = 1;
|
|
presentInfo.pSwapchains = swapChains;
|
|
|
|
presentInfo.pImageIndices = &imageIndex;
|
|
|
|
result = vkQueuePresentKHR(graphicsQueue, &presentInfo);
|
|
|
|
if (framebuffer_resized_flag_)
|
|
result = VK_ERROR_OUT_OF_DATE_KHR;
|
|
|
|
switch (result) {
|
|
case VK_SUCCESS:
|
|
break;
|
|
case VK_ERROR_OUT_OF_DATE_KHR:
|
|
case VK_SUBOPTIMAL_KHR:
|
|
framebuffer_resized_flag_ = false;
|
|
this->recreateSwapchain();
|
|
break;
|
|
default:
|
|
throw std::runtime_error("failed to present swapchain image!");
|
|
}
|
|
|
|
currentFrame = (currentFrame + 1) % MAX_FRAMES_IN_FLIGHT;
|
|
}
|
|
|
|
void recordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t imageIndex) {
|
|
VkCommandBufferBeginInfo beginInfo{};
|
|
beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
|
|
|
|
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 = renderPass;
|
|
renderPassInfo.framebuffer = framebuffers[imageIndex];
|
|
renderPassInfo.renderArea.offset = {0, 0};
|
|
renderPassInfo.renderArea.extent = swapchainExtent;
|
|
|
|
VkClearValue clearColor = {{{0.0f, 0.0f, 0.0f, 1.0f}}};
|
|
renderPassInfo.clearValueCount = 1;
|
|
renderPassInfo.pClearValues = &clearColor;
|
|
|
|
vkCmdBeginRenderPass(commandBuffer, &renderPassInfo, VK_SUBPASS_CONTENTS_INLINE);
|
|
|
|
// Start the Dear ImGui frame
|
|
ImGui_ImplVulkan_NewFrame();
|
|
ImGui_ImplSDL2_NewFrame();
|
|
ImGui::NewFrame();
|
|
|
|
// Create a simple ImGui window
|
|
ImGui::Begin("Hello, Vulkan + SDL2!");
|
|
ImGui::Text("This is a minimal ImGui + Vulkan + SDL2 example!");
|
|
static float f = 0.0f;
|
|
static int counter = 0;
|
|
ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
|
|
if (ImGui::Button("Button"))
|
|
counter++;
|
|
ImGui::SameLine();
|
|
ImGui::Text("counter = %d", counter);
|
|
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
|
|
ImGui::End();
|
|
|
|
// Rendering
|
|
ImGui::Render();
|
|
ImDrawData* draw_data = ImGui::GetDrawData();
|
|
ImGui_ImplVulkan_RenderDrawData(draw_data, commandBuffer);
|
|
|
|
vkCmdEndRenderPass(commandBuffer);
|
|
|
|
if (vkEndCommandBuffer(commandBuffer) != VK_SUCCESS) {
|
|
throw std::runtime_error("Failed to record command buffer!");
|
|
}
|
|
}
|
|
|
|
void recreateSwapchain() {
|
|
// handle window minimization: wait until window has valid size
|
|
int width = 0;
|
|
int height = 0;
|
|
SDL_GetWindowSize(window_, &width, &height);
|
|
while (width == 0 || height == 0) {
|
|
SDL_GetWindowSize(window_, &width, &height);
|
|
SDL_WaitEvent(nullptr);
|
|
}
|
|
|
|
// wait until device idle before cleaning up resources
|
|
vkDeviceWaitIdle(device);
|
|
|
|
// cleanup old swapchain
|
|
this->cleanupFrameBuffers();
|
|
this->cleanupImageViews();
|
|
this->cleanupSwapchain();
|
|
|
|
// create new swapchain
|
|
this->createSwapchain();
|
|
this->createImageViews();
|
|
this->createFramebuffers();
|
|
}
|
|
|
|
void cleanupFrameBuffers() {
|
|
for (auto framebuffer : framebuffers) {
|
|
vkDestroyFramebuffer(device, framebuffer, nullptr);
|
|
}
|
|
framebuffers.clear();
|
|
}
|
|
|
|
void cleanupImageViews() {
|
|
for (auto imageView : swapchainImageViews) {
|
|
vkDestroyImageView(device, imageView, nullptr);
|
|
}
|
|
swapchainImageViews.clear();
|
|
}
|
|
|
|
void cleanupSwapchain() {
|
|
vkDestroySwapchainKHR(device, swapchain, nullptr);
|
|
}
|
|
|
|
void cleanup() {
|
|
ImGui_ImplVulkan_Shutdown();
|
|
ImGui_ImplSDL2_Shutdown();
|
|
ImGui::DestroyContext();
|
|
|
|
for (size_t i = 0; i < MAX_FRAMES_IN_FLIGHT; i++) {
|
|
vkDestroySemaphore(device, renderFinishedSemaphores[i], nullptr);
|
|
vkDestroySemaphore(device, imageAvailableSemaphores[i], nullptr);
|
|
vkDestroyFence(device, inFlightFences[i], nullptr);
|
|
}
|
|
|
|
vkDestroyCommandPool(device, commandPool, nullptr);
|
|
|
|
this->cleanupFrameBuffers();
|
|
this->cleanupImageViews();
|
|
this->cleanupSwapchain();
|
|
|
|
vkDestroyRenderPass(device, renderPass, nullptr);
|
|
vkDestroyDescriptorPool(device, descriptorPool, nullptr);
|
|
vkDestroyDevice(device, nullptr);
|
|
vkDestroySurfaceKHR(instance_, surface, nullptr);
|
|
vkDestroyInstance(instance_, nullptr);
|
|
this->instance_ = nullptr;
|
|
|
|
SDL_DestroyWindow(window_);
|
|
this->window_ = nullptr;
|
|
|
|
SDL_Quit();
|
|
}
|
|
|
|
private:
|
|
SDL_Window* window_ = nullptr;
|
|
|
|
VkInstance instance_;
|
|
VkPhysicalDevice physical_device_;
|
|
VkDevice device;
|
|
VkQueue graphicsQueue;
|
|
VkSurfaceKHR surface;
|
|
VkSwapchainKHR swapchain;
|
|
VkFormat swapchainImageFormat;
|
|
VkExtent2D swapchainExtent;
|
|
std::vector<VkImage> swapchainImages;
|
|
std::vector<VkImageView> swapchainImageViews;
|
|
VkRenderPass renderPass;
|
|
std::vector<VkFramebuffer> framebuffers;
|
|
VkCommandPool commandPool;
|
|
std::vector<VkCommandBuffer> commandBuffers;
|
|
std::vector<VkSemaphore> imageAvailableSemaphores;
|
|
std::vector<VkSemaphore> renderFinishedSemaphores;
|
|
std::vector<VkFence> inFlightFences;
|
|
VkDescriptorPool descriptorPool;
|
|
|
|
uint32_t currentFrame = 0;
|
|
const int MAX_FRAMES_IN_FLIGHT = 2;
|
|
uint32_t graphicsQueueFamily = 0;
|
|
/* true when window resize behavior detected,
|
|
* until swapchain in consistent state.
|
|
*/
|
|
bool framebuffer_resized_flag_ = false;
|
|
bool quit = false;
|
|
}; /*MinimalImGuiVulkan*/
|