// dear imgui: standalone example application for SDL2 + Vulkan // If you are new to dear imgui, see examples/README.txt and documentation at the top of imgui.cpp. // Important note to the reader who wish to integrate imgui_impl_vulkan.cpp/.h in their own engine/app. // - Common ImGui_ImplVulkan_XXX functions and structures are used to interface with imgui_impl_vulkan.cpp/.h. // You will use those if you want to use this rendering back-end in your engine/app. // - Helper ImGui_ImplVulkanH_XXX functions and structures are only used by this example (main.cpp) and by // the back-end itself (imgui_impl_vulkan.cpp), but should PROBABLY NOT be used by your own engine/app code. // Read comments in imgui_impl_vulkan.h. #include "imgui.h" #include "imgui_impl_sdl.h" #include "imgui_impl_vulkan.h" #include <stdio.h> // printf, fprintf #include <stdlib.h> // abort #include <SDL.h> #include <SDL_vulkan.h> #include <vulkan/vulkan.h> //#define IMGUI_UNLIMITED_FRAME_RATE #ifdef _DEBUG #define IMGUI_VULKAN_DEBUG_REPORT #endif static VkAllocationCallbacks* g_Allocator = NULL; static VkInstance g_Instance = VK_NULL_HANDLE; static VkPhysicalDevice g_PhysicalDevice = VK_NULL_HANDLE; static VkDevice g_Device = VK_NULL_HANDLE; static uint32_t g_QueueFamily = (uint32_t)-1; static VkQueue g_Queue = VK_NULL_HANDLE; static VkDebugReportCallbackEXT g_DebugReport = VK_NULL_HANDLE; static VkPipelineCache g_PipelineCache = VK_NULL_HANDLE; static VkDescriptorPool g_DescriptorPool = VK_NULL_HANDLE; static ImGui_ImplVulkanH_Window g_MainWindowData; static uint32_t g_MinImageCount = 2; static bool g_SwapChainRebuild = false; static int g_SwapChainResizeWidth = 0; static int g_SwapChainResizeHeight = 0; static void check_vk_result(VkResult err) { if (err == 0) return; printf("VkResult %d\n", err); if (err < 0) abort(); } #ifdef IMGUI_VULKAN_DEBUG_REPORT static VKAPI_ATTR VkBool32 VKAPI_CALL debug_report(VkDebugReportFlagsEXT flags, VkDebugReportObjectTypeEXT objectType, uint64_t object, size_t location, int32_t messageCode, const char* pLayerPrefix, const char* pMessage, void* pUserData) { (void)flags; (void)object; (void)location; (void)messageCode; (void)pUserData; (void)pLayerPrefix; // Unused arguments fprintf(stderr, "[vulkan] ObjectType: %i\nMessage: %s\n\n", objectType, pMessage); return VK_FALSE; } #endif // IMGUI_VULKAN_DEBUG_REPORT static void SetupVulkan(const char** extensions, uint32_t extensions_count) { VkResult err; // Create Vulkan Instance { VkInstanceCreateInfo create_info = {}; create_info.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO; create_info.enabledExtensionCount = extensions_count; create_info.ppEnabledExtensionNames = extensions; #ifdef IMGUI_VULKAN_DEBUG_REPORT // Enabling multiple validation layers grouped as LunarG standard validation const char* layers[] = { "VK_LAYER_LUNARG_standard_validation" }; create_info.enabledLayerCount = 1; create_info.ppEnabledLayerNames = layers; // Enable debug report extension (we need additional storage, so we duplicate the user array to add our new extension to it) const char** extensions_ext = (const char**)malloc(sizeof(const char*) * (extensions_count + 1)); memcpy(extensions_ext, extensions, extensions_count * sizeof(const char*)); extensions_ext[extensions_count] = "VK_EXT_debug_report"; create_info.enabledExtensionCount = extensions_count + 1; create_info.ppEnabledExtensionNames = extensions_ext; // Create Vulkan Instance err = vkCreateInstance(&create_info, g_Allocator, &g_Instance); check_vk_result(err); free(extensions_ext); // Get the function pointer (required for any extensions) auto vkCreateDebugReportCallbackEXT = (PFN_vkCreateDebugReportCallbackEXT)vkGetInstanceProcAddr(g_Instance, "vkCreateDebugReportCallbackEXT"); IM_ASSERT(vkCreateDebugReportCallbackEXT != NULL); // Setup the debug report callback VkDebugReportCallbackCreateInfoEXT debug_report_ci = {}; debug_report_ci.sType = VK_STRUCTURE_TYPE_DEBUG_REPORT_CALLBACK_CREATE_INFO_EXT; debug_report_ci.flags = VK_DEBUG_REPORT_ERROR_BIT_EXT | VK_DEBUG_REPORT_WARNING_BIT_EXT | VK_DEBUG_REPORT_PERFORMANCE_WARNING_BIT_EXT; debug_report_ci.pfnCallback = debug_report; debug_report_ci.pUserData = NULL; err = vkCreateDebugReportCallbackEXT(g_Instance, &debug_report_ci, g_Allocator, &g_DebugReport); check_vk_result(err); #else // Create Vulkan Instance without any debug feature err = vkCreateInstance(&create_info, g_Allocator, &g_Instance); check_vk_result(err); IM_UNUSED(g_DebugReport); #endif } // Select GPU { uint32_t gpu_count; err = vkEnumeratePhysicalDevices(g_Instance, &gpu_count, NULL); check_vk_result(err); IM_ASSERT(gpu_count > 0); VkPhysicalDevice* gpus = (VkPhysicalDevice*)malloc(sizeof(VkPhysicalDevice) * gpu_count); err = vkEnumeratePhysicalDevices(g_Instance, &gpu_count, gpus); check_vk_result(err); // If a number >1 of GPUs got reported, you should find the best fit GPU for your purpose // e.g. VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU if available, or with the greatest memory available, etc. // for sake of simplicity we'll just take the first one, assuming it has a graphics queue family. g_PhysicalDevice = gpus[0]; free(gpus); } // Select graphics queue family { uint32_t count; vkGetPhysicalDeviceQueueFamilyProperties(g_PhysicalDevice, &count, NULL); VkQueueFamilyProperties* queues = (VkQueueFamilyProperties*)malloc(sizeof(VkQueueFamilyProperties) * count); vkGetPhysicalDeviceQueueFamilyProperties(g_PhysicalDevice, &count, queues); for (uint32_t i = 0; i < count; i++) if (queues[i].queueFlags & VK_QUEUE_GRAPHICS_BIT) { g_QueueFamily = i; break; } free(queues); IM_ASSERT(g_QueueFamily != (uint32_t)-1); } // Create Logical Device (with 1 queue) { int device_extension_count = 1; const char* device_extensions[] = { "VK_KHR_swapchain" }; const float queue_priority[] = { 1.0f }; VkDeviceQueueCreateInfo queue_info[1] = {}; queue_info[0].sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO; queue_info[0].queueFamilyIndex = g_QueueFamily; queue_info[0].queueCount = 1; queue_info[0].pQueuePriorities = queue_priority; VkDeviceCreateInfo create_info = {}; create_info.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO; create_info.queueCreateInfoCount = sizeof(queue_info) / sizeof(queue_info[0]); create_info.pQueueCreateInfos = queue_info; create_info.enabledExtensionCount = device_extension_count; create_info.ppEnabledExtensionNames = device_extensions; err = vkCreateDevice(g_PhysicalDevice, &create_info, g_Allocator, &g_Device); check_vk_result(err); vkGetDeviceQueue(g_Device, g_QueueFamily, 0, &g_Queue); } // Create Descriptor Pool { 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 * IM_ARRAYSIZE(pool_sizes); pool_info.poolSizeCount = (uint32_t)IM_ARRAYSIZE(pool_sizes); pool_info.pPoolSizes = pool_sizes; err = vkCreateDescriptorPool(g_Device, &pool_info, g_Allocator, &g_DescriptorPool); check_vk_result(err); } } // All the ImGui_ImplVulkanH_XXX structures/functions are optional helpers used by the demo. // Your real engine/app may not use them. static void SetupVulkanWindow(ImGui_ImplVulkanH_Window* wd, VkSurfaceKHR surface, int width, int height) { wd->Surface = surface; // Check for WSI support VkBool32 res; vkGetPhysicalDeviceSurfaceSupportKHR(g_PhysicalDevice, g_QueueFamily, wd->Surface, &res); if (res != VK_TRUE) { fprintf(stderr, "Error no WSI support on physical device 0\n"); exit(-1); } // Select Surface Format const VkFormat requestSurfaceImageFormat[] = { VK_FORMAT_B8G8R8A8_UNORM, VK_FORMAT_R8G8B8A8_UNORM, VK_FORMAT_B8G8R8_UNORM, VK_FORMAT_R8G8B8_UNORM }; const VkColorSpaceKHR requestSurfaceColorSpace = VK_COLORSPACE_SRGB_NONLINEAR_KHR; wd->SurfaceFormat = ImGui_ImplVulkanH_SelectSurfaceFormat(g_PhysicalDevice, wd->Surface, requestSurfaceImageFormat, (size_t)IM_ARRAYSIZE(requestSurfaceImageFormat), requestSurfaceColorSpace); // Select Present Mode #ifdef IMGUI_UNLIMITED_FRAME_RATE VkPresentModeKHR present_modes[] = { VK_PRESENT_MODE_MAILBOX_KHR, VK_PRESENT_MODE_IMMEDIATE_KHR, VK_PRESENT_MODE_FIFO_KHR }; #else VkPresentModeKHR present_modes[] = { VK_PRESENT_MODE_FIFO_KHR }; #endif wd->PresentMode = ImGui_ImplVulkanH_SelectPresentMode(g_PhysicalDevice, wd->Surface, &present_modes[0], IM_ARRAYSIZE(present_modes)); //printf("[vulkan] Selected PresentMode = %d\n", wd->PresentMode); // Create SwapChain, RenderPass, Framebuffer, etc. IM_ASSERT(g_MinImageCount >= 2); ImGui_ImplVulkanH_CreateWindow(g_Instance, g_PhysicalDevice, g_Device, wd, g_QueueFamily, g_Allocator, width, height, g_MinImageCount); } static void CleanupVulkan() { vkDestroyDescriptorPool(g_Device, g_DescriptorPool, g_Allocator); #ifdef IMGUI_VULKAN_DEBUG_REPORT // Remove the debug report callback auto vkDestroyDebugReportCallbackEXT = (PFN_vkDestroyDebugReportCallbackEXT)vkGetInstanceProcAddr(g_Instance, "vkDestroyDebugReportCallbackEXT"); vkDestroyDebugReportCallbackEXT(g_Instance, g_DebugReport, g_Allocator); #endif // IMGUI_VULKAN_DEBUG_REPORT vkDestroyDevice(g_Device, g_Allocator); vkDestroyInstance(g_Instance, g_Allocator); } static void CleanupVulkanWindow() { ImGui_ImplVulkanH_DestroyWindow(g_Instance, g_Device, &g_MainWindowData, g_Allocator); } static void FrameRender(ImGui_ImplVulkanH_Window* wd) { VkResult err; VkSemaphore image_acquired_semaphore = wd->FrameSemaphores[wd->SemaphoreIndex].ImageAcquiredSemaphore; VkSemaphore render_complete_semaphore = wd->FrameSemaphores[wd->SemaphoreIndex].RenderCompleteSemaphore; err = vkAcquireNextImageKHR(g_Device, wd->Swapchain, UINT64_MAX, image_acquired_semaphore, VK_NULL_HANDLE, &wd->FrameIndex); check_vk_result(err); ImGui_ImplVulkanH_Frame* fd = &wd->Frames[wd->FrameIndex]; { err = vkWaitForFences(g_Device, 1, &fd->Fence, VK_TRUE, UINT64_MAX); // wait indefinitely instead of periodically checking check_vk_result(err); err = vkResetFences(g_Device, 1, &fd->Fence); check_vk_result(err); } { err = vkResetCommandPool(g_Device, fd->CommandPool, 0); check_vk_result(err); VkCommandBufferBeginInfo info = {}; info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO; info.flags |= VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT; err = vkBeginCommandBuffer(fd->CommandBuffer, &info); check_vk_result(err); } { VkRenderPassBeginInfo info = {}; info.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO; info.renderPass = wd->RenderPass; info.framebuffer = fd->Framebuffer; info.renderArea.extent.width = wd->Width; info.renderArea.extent.height = wd->Height; info.clearValueCount = 1; info.pClearValues = &wd->ClearValue; vkCmdBeginRenderPass(fd->CommandBuffer, &info, VK_SUBPASS_CONTENTS_INLINE); } // Record Imgui Draw Data and draw funcs into command buffer ImGui_ImplVulkan_RenderDrawData(ImGui::GetDrawData(), fd->CommandBuffer); // Submit command buffer vkCmdEndRenderPass(fd->CommandBuffer); { VkPipelineStageFlags wait_stage = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT; VkSubmitInfo info = {}; info.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO; info.waitSemaphoreCount = 1; info.pWaitSemaphores = &image_acquired_semaphore; info.pWaitDstStageMask = &wait_stage; info.commandBufferCount = 1; info.pCommandBuffers = &fd->CommandBuffer; info.signalSemaphoreCount = 1; info.pSignalSemaphores = &render_complete_semaphore; err = vkEndCommandBuffer(fd->CommandBuffer); check_vk_result(err); err = vkQueueSubmit(g_Queue, 1, &info, fd->Fence); check_vk_result(err); } } static void FramePresent(ImGui_ImplVulkanH_Window* wd) { VkSemaphore render_complete_semaphore = wd->FrameSemaphores[wd->SemaphoreIndex].RenderCompleteSemaphore; VkPresentInfoKHR info = {}; info.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR; info.waitSemaphoreCount = 1; info.pWaitSemaphores = &render_complete_semaphore; info.swapchainCount = 1; info.pSwapchains = &wd->Swapchain; info.pImageIndices = &wd->FrameIndex; VkResult err = vkQueuePresentKHR(g_Queue, &info); check_vk_result(err); wd->SemaphoreIndex = (wd->SemaphoreIndex + 1) % wd->ImageCount; // Now we can use the next set of semaphores } int main(int, char**) { // Setup SDL if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 0) { printf("Error: %s\n", SDL_GetError()); return -1; } // Setup window SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_VULKAN | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI); SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+Vulkan example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags); // Setup Vulkan uint32_t extensions_count = 0; SDL_Vulkan_GetInstanceExtensions(window, &extensions_count, NULL); const char** extensions = new const char*[extensions_count]; SDL_Vulkan_GetInstanceExtensions(window, &extensions_count, extensions); SetupVulkan(extensions, extensions_count); delete[] extensions; // Create Window Surface VkSurfaceKHR surface; VkResult err; if (SDL_Vulkan_CreateSurface(window, g_Instance, &surface) == 0) { printf("Failed to create Vulkan surface.\n"); return 1; } // Create Framebuffers int w, h; SDL_GetWindowSize(window, &w, &h); ImGui_ImplVulkanH_Window* wd = &g_MainWindowData; SetupVulkanWindow(wd, surface, w, h); // Setup Dear ImGui context IMGUI_CHECKVERSION(); ImGui::CreateContext(); ImGuiIO& io = ImGui::GetIO(); (void)io; io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls //io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls io.ConfigFlags |= ImGuiConfigFlags_DockingEnable; // Enable Docking io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable; // Enable Multi-Viewport / Platform Windows //io.ConfigFlags |= ImGuiConfigFlags_ViewportsNoTaskBarIcons; //io.ConfigFlags |= ImGuiConfigFlags_ViewportsNoMerge; // Setup Dear ImGui style ImGui::StyleColorsDark(); //ImGui::StyleColorsClassic(); // When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones. ImGuiStyle& style = ImGui::GetStyle(); if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) { style.WindowRounding = 0.0f; style.Colors[ImGuiCol_WindowBg].w = 1.0f; } // Setup Platform/Renderer bindings ImGui_ImplSDL2_InitForVulkan(window); ImGui_ImplVulkan_InitInfo init_info = {}; init_info.Instance = g_Instance; init_info.PhysicalDevice = g_PhysicalDevice; init_info.Device = g_Device; init_info.QueueFamily = g_QueueFamily; init_info.Queue = g_Queue; init_info.PipelineCache = g_PipelineCache; init_info.DescriptorPool = g_DescriptorPool; init_info.Allocator = g_Allocator; init_info.MinImageCount = g_MinImageCount; init_info.ImageCount = wd->ImageCount; init_info.CheckVkResultFn = check_vk_result; ImGui_ImplVulkan_Init(&init_info, wd->RenderPass); // Load Fonts // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit). // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call. // - Read 'docs/FONTS.txt' for more instructions and details. // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ ! //io.Fonts->AddFontDefault(); //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f); //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f); //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f); //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f); //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese()); //IM_ASSERT(font != NULL); // Upload Fonts { // Use any command queue VkCommandPool command_pool = wd->Frames[wd->FrameIndex].CommandPool; VkCommandBuffer command_buffer = wd->Frames[wd->FrameIndex].CommandBuffer; err = vkResetCommandPool(g_Device, command_pool, 0); check_vk_result(err); VkCommandBufferBeginInfo begin_info = {}; begin_info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO; begin_info.flags |= VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT; err = vkBeginCommandBuffer(command_buffer, &begin_info); check_vk_result(err); ImGui_ImplVulkan_CreateFontsTexture(command_buffer); VkSubmitInfo end_info = {}; end_info.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO; end_info.commandBufferCount = 1; end_info.pCommandBuffers = &command_buffer; err = vkEndCommandBuffer(command_buffer); check_vk_result(err); err = vkQueueSubmit(g_Queue, 1, &end_info, VK_NULL_HANDLE); check_vk_result(err); err = vkDeviceWaitIdle(g_Device); check_vk_result(err); ImGui_ImplVulkan_DestroyFontUploadObjects(); } // Our state bool show_demo_window = true; bool show_another_window = false; ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f); // Main loop bool done = false; while (!done) { // Poll and handle events (inputs, window resize, etc.) // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs. // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application. // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application. // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags. SDL_Event event; while (SDL_PollEvent(&event)) { ImGui_ImplSDL2_ProcessEvent(&event); if (event.type == SDL_QUIT) done = true; if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_RESIZED && event.window.windowID == SDL_GetWindowID(window)) { g_SwapChainResizeWidth = (int)event.window.data1; g_SwapChainResizeHeight = (int)event.window.data2; g_SwapChainRebuild = true; } } if (g_SwapChainRebuild) { g_SwapChainRebuild = false; ImGui_ImplVulkan_SetMinImageCount(g_MinImageCount); ImGui_ImplVulkanH_CreateWindow(g_Instance, g_PhysicalDevice, g_Device, &g_MainWindowData, g_QueueFamily, g_Allocator, g_SwapChainResizeWidth, g_SwapChainResizeHeight, g_MinImageCount); g_MainWindowData.FrameIndex = 0; } // Start the Dear ImGui frame ImGui_ImplVulkan_NewFrame(); ImGui_ImplSDL2_NewFrame(window); ImGui::NewFrame(); // 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!). if (show_demo_window) ImGui::ShowDemoWindow(&show_demo_window); // 2. Show a simple window that we create ourselves. We use a Begin/End pair to created a named window. { static float f = 0.0f; static int counter = 0; ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it. ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too) ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state ImGui::Checkbox("Another Window", &show_another_window); ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color if (ImGui::Button("Button")) // Buttons return true when clicked (most widgets return true when edited/activated) 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(); } // 3. Show another simple window. if (show_another_window) { ImGui::Begin("Another Window", &show_another_window); // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked) ImGui::Text("Hello from another window!"); if (ImGui::Button("Close Me")) show_another_window = false; ImGui::End(); } // Rendering ImGui::Render(); memcpy(&wd->ClearValue.color.float32[0], &clear_color, 4 * sizeof(float)); FrameRender(wd); // Update and Render additional Platform Windows if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) { ImGui::UpdatePlatformWindows(); ImGui::RenderPlatformWindowsDefault(); } FramePresent(wd); } // Cleanup err = vkDeviceWaitIdle(g_Device); check_vk_result(err); ImGui_ImplVulkan_Shutdown(); ImGui_ImplSDL2_Shutdown(); ImGui::DestroyContext(); CleanupVulkanWindow(); CleanupVulkan(); SDL_DestroyWindow(window); SDL_Quit(); return 0; }