// ImGui - standalone example application for Glfw + Vulkan, using programmable pipeline // If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp. #include <imgui.h> #include <stdio.h> // printf, fprintf #include <stdlib.h> // abort #define GLFW_INCLUDE_NONE #define GLFW_INCLUDE_VULKAN #include <GLFW/glfw3.h> #include "imgui_impl_glfw_vulkan.h" #define IMGUI_MAX_POSSIBLE_BACK_BUFFERS 16 #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 VkSurfaceKHR g_Surface = VK_NULL_HANDLE; static VkPhysicalDevice g_Gpu = VK_NULL_HANDLE; static VkDevice g_Device = VK_NULL_HANDLE; static VkSwapchainKHR g_Swapchain = VK_NULL_HANDLE; static VkRenderPass g_RenderPass = VK_NULL_HANDLE; static uint32_t g_QueueFamily = 0; static VkQueue g_Queue = VK_NULL_HANDLE; static VkDebugReportCallbackEXT g_Debug_Report = VK_NULL_HANDLE; static VkSurfaceFormatKHR g_SurfaceFormat; static VkImageSubresourceRange g_ImageRange = {VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1}; static VkPresentModeKHR g_PresentMode; static VkPipelineCache g_PipelineCache = VK_NULL_HANDLE; static VkDescriptorPool g_DescriptorPool = VK_NULL_HANDLE; static int fb_width, fb_height; static uint32_t g_BackbufferIndices[IMGUI_VK_QUEUED_FRAMES]; // keep track of recently rendered swapchain frame indices static uint32_t g_BackBufferCount = 0; static VkImage g_BackBuffer[IMGUI_MAX_POSSIBLE_BACK_BUFFERS] = {}; static VkImageView g_BackBufferView[IMGUI_MAX_POSSIBLE_BACK_BUFFERS] = {}; static VkFramebuffer g_Framebuffer[IMGUI_MAX_POSSIBLE_BACK_BUFFERS] = {}; static uint32_t g_FrameIndex = 0; static VkCommandPool g_CommandPool[IMGUI_VK_QUEUED_FRAMES]; static VkCommandBuffer g_CommandBuffer[IMGUI_VK_QUEUED_FRAMES]; static VkFence g_Fence[IMGUI_VK_QUEUED_FRAMES]; static VkSemaphore g_PresentCompleteSemaphore[IMGUI_VK_QUEUED_FRAMES]; static VkSemaphore g_RenderCompleteSemaphore[IMGUI_VK_QUEUED_FRAMES]; static VkClearValue g_ClearValue = {}; static void check_vk_result(VkResult err) { if (err == 0) return; printf("VkResult %d\n", err); if (err < 0) abort(); } static void resize_vulkan(GLFWwindow* /*window*/, int w, int h) { VkResult err; VkSwapchainKHR old_swapchain = g_Swapchain; err = vkDeviceWaitIdle(g_Device); check_vk_result(err); // Destroy old Framebuffer: for (uint32_t i = 0; i < g_BackBufferCount; i++) if (g_BackBufferView[i]) vkDestroyImageView(g_Device, g_BackBufferView[i], g_Allocator); for (uint32_t i = 0; i < g_BackBufferCount; i++) if (g_Framebuffer[i]) vkDestroyFramebuffer(g_Device, g_Framebuffer[i], g_Allocator); if (g_RenderPass) vkDestroyRenderPass(g_Device, g_RenderPass, g_Allocator); // Create Swapchain: { VkSwapchainCreateInfoKHR info = {}; info.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR; info.surface = g_Surface; info.imageFormat = g_SurfaceFormat.format; info.imageColorSpace = g_SurfaceFormat.colorSpace; info.imageArrayLayers = 1; info.imageUsage |= VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT; info.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE; info.preTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR; info.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR; info.presentMode = g_PresentMode; info.clipped = VK_TRUE; info.oldSwapchain = old_swapchain; VkSurfaceCapabilitiesKHR cap; err = vkGetPhysicalDeviceSurfaceCapabilitiesKHR(g_Gpu, g_Surface, &cap); check_vk_result(err); if (cap.maxImageCount > 0) info.minImageCount = (cap.minImageCount + 2 < cap.maxImageCount) ? (cap.minImageCount + 2) : cap.maxImageCount; else info.minImageCount = cap.minImageCount + 2; if (cap.currentExtent.width == 0xffffffff) { fb_width = w; fb_height = h; info.imageExtent.width = fb_width; info.imageExtent.height = fb_height; } else { fb_width = cap.currentExtent.width; fb_height = cap.currentExtent.height; info.imageExtent.width = fb_width; info.imageExtent.height = fb_height; } err = vkCreateSwapchainKHR(g_Device, &info, g_Allocator, &g_Swapchain); check_vk_result(err); err = vkGetSwapchainImagesKHR(g_Device, g_Swapchain, &g_BackBufferCount, NULL); check_vk_result(err); err = vkGetSwapchainImagesKHR(g_Device, g_Swapchain, &g_BackBufferCount, g_BackBuffer); check_vk_result(err); } if (old_swapchain) vkDestroySwapchainKHR(g_Device, old_swapchain, g_Allocator); // Create the Render Pass: { VkAttachmentDescription attachment = {}; attachment.format = g_SurfaceFormat.format; attachment.samples = VK_SAMPLE_COUNT_1_BIT; attachment.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR; attachment.storeOp = VK_ATTACHMENT_STORE_OP_STORE; attachment.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE; attachment.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE; attachment.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED; attachment.finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR; VkAttachmentReference color_attachment = {}; color_attachment.attachment = 0; color_attachment.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL; VkSubpassDescription subpass = {}; subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS; subpass.colorAttachmentCount = 1; subpass.pColorAttachments = &color_attachment; VkRenderPassCreateInfo info = {}; info.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO; info.attachmentCount = 1; info.pAttachments = &attachment; info.subpassCount = 1; info.pSubpasses = &subpass; err = vkCreateRenderPass(g_Device, &info, g_Allocator, &g_RenderPass); check_vk_result(err); } // Create The Image Views { VkImageViewCreateInfo info = {}; info.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO; info.viewType = VK_IMAGE_VIEW_TYPE_2D; info.format = g_SurfaceFormat.format; info.components.r = VK_COMPONENT_SWIZZLE_R; info.components.g = VK_COMPONENT_SWIZZLE_G; info.components.b = VK_COMPONENT_SWIZZLE_B; info.components.a = VK_COMPONENT_SWIZZLE_A; info.subresourceRange = g_ImageRange; for (uint32_t i = 0; i < g_BackBufferCount; i++) { info.image = g_BackBuffer[i]; err = vkCreateImageView(g_Device, &info, g_Allocator, &g_BackBufferView[i]); check_vk_result(err); } } // Create Framebuffer: { VkImageView attachment[1]; VkFramebufferCreateInfo info = {}; info.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO; info.renderPass = g_RenderPass; info.attachmentCount = 1; info.pAttachments = attachment; info.width = fb_width; info.height = fb_height; info.layers = 1; for (uint32_t i = 0; i < g_BackBufferCount; i++) { attachment[0] = g_BackBufferView[i]; err = vkCreateFramebuffer(g_Device, &info, g_Allocator, &g_Framebuffer[i]); check_vk_result(err); } } } #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) { printf("[vulkan] ObjectType: %i\nMessage: %s\n\n", objectType, pMessage ); return VK_FALSE; } #endif // IMGUI_VULKAN_DEBUG_REPORT static void setup_vulkan(GLFWwindow* window) { VkResult err; // Create Vulkan Instance { uint32_t extensions_count; const char** glfw_extensions = glfwGetRequiredInstanceExtensions(&extensions_count); VkInstanceCreateInfo create_info = {}; create_info.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO; create_info.enabledExtensionCount = extensions_count; create_info.ppEnabledExtensionNames = glfw_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; // need additional storage for char pointer to debug report extension const char** extensions = (const char**)malloc(sizeof(const char*) * (extensions_count + 1)); for (size_t i = 0; i < extensions_count; i++) extensions[i] = glfw_extensions[i]; extensions[ extensions_count ] = "VK_EXT_debug_report"; create_info.enabledExtensionCount = extensions_count+1; create_info.ppEnabledExtensionNames = extensions; #endif // IMGUI_VULKAN_DEBUG_REPORT err = vkCreateInstance(&create_info, g_Allocator, &g_Instance); check_vk_result(err); #ifdef IMGUI_VULKAN_DEBUG_REPORT free(extensions); // create 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; // get the proc address of the function pointer, required for used extensions PFN_vkCreateDebugReportCallbackEXT vkCreateDebugReportCallbackEXT = (PFN_vkCreateDebugReportCallbackEXT)vkGetInstanceProcAddr(g_Instance, "vkCreateDebugReportCallbackEXT"); err = vkCreateDebugReportCallbackEXT( g_Instance, &debug_report_ci, g_Allocator, &g_Debug_Report ); check_vk_result(err); #endif // IMGUI_VULKAN_DEBUG_REPORT } // Create Window Surface { err = glfwCreateWindowSurface(g_Instance, window, g_Allocator, &g_Surface); check_vk_result(err); } // Get GPU { uint32_t gpu_count; err = vkEnumeratePhysicalDevices(g_Instance, &gpu_count, NULL); check_vk_result(err); 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_Gpu = gpus[0]; free(gpus); } // Get queue { uint32_t count; vkGetPhysicalDeviceQueueFamilyProperties(g_Gpu, &count, NULL); VkQueueFamilyProperties* queues = (VkQueueFamilyProperties*)malloc(sizeof(VkQueueFamilyProperties) * count); vkGetPhysicalDeviceQueueFamilyProperties(g_Gpu, &count, queues); for (uint32_t i = 0; i < count; i++) { if (queues[i].queueFlags & VK_QUEUE_GRAPHICS_BIT) { g_QueueFamily = i; break; } } free(queues); } // Check for WSI support { VkBool32 res; vkGetPhysicalDeviceSurfaceSupportKHR(g_Gpu, g_QueueFamily, g_Surface, &res); if (res != VK_TRUE) { fprintf(stderr, "Error no WSI support on physical device 0\n"); exit(-1); } } // Get Surface Format { // Per Spec Format and View Format are expected to be the same unless VK_IMAGE_CREATE_MUTABLE_BIT was set at image creation // Assuming that the default behavior is without setting this bit, there is no need for separate Spawchain image and image view format // additionally several new color spaces were introduced with Vulkan Spec v1.0.40 // hence we must make sure that a format with the mostly available color space, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR, is found and used uint32_t count; vkGetPhysicalDeviceSurfaceFormatsKHR(g_Gpu, g_Surface, &count, NULL); VkSurfaceFormatKHR *formats = (VkSurfaceFormatKHR*)malloc(sizeof(VkSurfaceFormatKHR) * count); vkGetPhysicalDeviceSurfaceFormatsKHR(g_Gpu, g_Surface, &count, formats); // first check if only one format, VK_FORMAT_UNDEFINED, is available, which would imply that any format is available if (count == 1) { if( formats[0].format == VK_FORMAT_UNDEFINED ) { g_SurfaceFormat.format = VK_FORMAT_B8G8R8A8_UNORM; g_SurfaceFormat.colorSpace = VK_COLORSPACE_SRGB_NONLINEAR_KHR; } else { // no point in searching another format g_SurfaceFormat = formats[0]; } } else { // request several formats, the first found will be used VkFormat requestSurfaceImageFormat[] = {VK_FORMAT_B8G8R8A8_UNORM, VK_FORMAT_R8G8B8A8_UNORM, VK_FORMAT_B8G8R8_UNORM, VK_FORMAT_R8G8B8_UNORM}; VkColorSpaceKHR requestSurfaceColorSpace = VK_COLORSPACE_SRGB_NONLINEAR_KHR; bool requestedFound = false; for (size_t i = 0; i < sizeof(requestSurfaceImageFormat) / sizeof(requestSurfaceImageFormat[0]); i++) { if( requestedFound ) { break; } for (uint32_t j = 0; j < count; j++) { if (formats[j].format == requestSurfaceImageFormat[i] && formats[j].colorSpace == requestSurfaceColorSpace) { g_SurfaceFormat = formats[j]; requestedFound = true; } } } // if none of the requested image formats could be found, use the first available if (!requestedFound) g_SurfaceFormat = formats[0]; } free(formats); } // Get Present Mode { // Requst a certain mode and confirm that it is available. If not use VK_PRESENT_MODE_FIFO_KHR which is mandatory #ifdef IMGUI_UNLIMITED_FRAME_RATE g_PresentMode = VK_PRESENT_MODE_IMMEDIATE_KHR; #else g_PresentMode = VK_PRESENT_MODE_FIFO_KHR; #endif uint32_t count = 0; vkGetPhysicalDeviceSurfacePresentModesKHR(g_Gpu, g_Surface, &count, nullptr); VkPresentModeKHR* presentModes = (VkPresentModeKHR*)malloc(sizeof(VkQueueFamilyProperties) * count); vkGetPhysicalDeviceSurfacePresentModesKHR(g_Gpu, g_Surface, &count, presentModes); bool presentModeAvailable = false; for (size_t i = 0; i < count; i++) { if (presentModes[i] == g_PresentMode) { presentModeAvailable = true; break; } } if( !presentModeAvailable ) g_PresentMode = VK_PRESENT_MODE_FIFO_KHR; // always available } // Create Logical Device { int device_extension_count = 1; const char* device_extensions[] = {"VK_KHR_swapchain"}; const uint32_t queue_index = 0; const uint32_t queue_count = 1; 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 = queue_count; 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_Gpu, &create_info, g_Allocator, &g_Device); check_vk_result(err); vkGetDeviceQueue(g_Device, g_QueueFamily, queue_index, &g_Queue); } // Create Framebuffers { int w, h; glfwGetFramebufferSize(window, &w, &h); resize_vulkan(window, w, h); glfwSetFramebufferSizeCallback(window, resize_vulkan); } // Create Command Buffers for (int i = 0; i < IMGUI_VK_QUEUED_FRAMES; i++) { { VkCommandPoolCreateInfo info = {}; info.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO; info.flags = VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT; info.queueFamilyIndex = g_QueueFamily; err = vkCreateCommandPool(g_Device, &info, g_Allocator, &g_CommandPool[i]); check_vk_result(err); } { VkCommandBufferAllocateInfo info = {}; info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO; info.commandPool = g_CommandPool[i]; info.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY; info.commandBufferCount = 1; err = vkAllocateCommandBuffers(g_Device, &info, &g_CommandBuffer[i]); check_vk_result(err); } { VkFenceCreateInfo info = {}; info.sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO; info.flags = VK_FENCE_CREATE_SIGNALED_BIT; err = vkCreateFence(g_Device, &info, g_Allocator, &g_Fence[i]); check_vk_result(err); } { VkSemaphoreCreateInfo info = {}; info.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO; err = vkCreateSemaphore(g_Device, &info, g_Allocator, &g_PresentCompleteSemaphore[i]); check_vk_result(err); err = vkCreateSemaphore(g_Device, &info, g_Allocator, &g_RenderCompleteSemaphore[i]); check_vk_result(err); } } // Create Descriptor Pool { VkDescriptorPoolSize pool_size[11] = { { 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 * 11; pool_info.poolSizeCount = 11; pool_info.pPoolSizes = pool_size; err = vkCreateDescriptorPool(g_Device, &pool_info, g_Allocator, &g_DescriptorPool); check_vk_result(err); } } static void cleanup_vulkan() { vkDestroyDescriptorPool(g_Device, g_DescriptorPool, g_Allocator); for (int i = 0; i < IMGUI_VK_QUEUED_FRAMES; i++) { vkDestroyFence(g_Device, g_Fence[i], g_Allocator); vkFreeCommandBuffers(g_Device, g_CommandPool[i], 1, &g_CommandBuffer[i]); vkDestroyCommandPool(g_Device, g_CommandPool[i], g_Allocator); vkDestroySemaphore(g_Device, g_PresentCompleteSemaphore[i], g_Allocator); vkDestroySemaphore(g_Device, g_RenderCompleteSemaphore[i], g_Allocator); } for (uint32_t i = 0; i < g_BackBufferCount; i++) { vkDestroyImageView(g_Device, g_BackBufferView[i], g_Allocator); vkDestroyFramebuffer(g_Device, g_Framebuffer[i], g_Allocator); } vkDestroyRenderPass(g_Device, g_RenderPass, g_Allocator); vkDestroySwapchainKHR(g_Device, g_Swapchain, g_Allocator); vkDestroySurfaceKHR(g_Instance, g_Surface, g_Allocator); #ifdef IMGUI_VULKAN_DEBUG_REPORT // get the proc address of the function pointer, required for used extensions auto vkDestroyDebugReportCallbackEXT = (PFN_vkDestroyDebugReportCallbackEXT)vkGetInstanceProcAddr(g_Instance, "vkDestroyDebugReportCallbackEXT"); vkDestroyDebugReportCallbackEXT(g_Instance, g_Debug_Report, g_Allocator); #endif // IMGUI_VULKAN_DEBUG_REPORT vkDestroyDevice(g_Device, g_Allocator); vkDestroyInstance(g_Instance, g_Allocator); } static void frame_begin() { VkResult err; while (true) { err = vkWaitForFences(g_Device, 1, &g_Fence[g_FrameIndex], VK_TRUE, 100); if (err == VK_SUCCESS) break; if (err == VK_TIMEOUT) continue; check_vk_result(err); } { err = vkAcquireNextImageKHR(g_Device, g_Swapchain, UINT64_MAX, g_PresentCompleteSemaphore[g_FrameIndex], VK_NULL_HANDLE, &g_BackbufferIndices[g_FrameIndex]); check_vk_result(err); } { err = vkResetCommandPool(g_Device, g_CommandPool[g_FrameIndex], 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(g_CommandBuffer[g_FrameIndex], &info); check_vk_result(err); } { VkRenderPassBeginInfo info = {}; info.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO; info.renderPass = g_RenderPass; info.framebuffer = g_Framebuffer[g_BackbufferIndices[g_FrameIndex]]; info.renderArea.extent.width = fb_width; info.renderArea.extent.height = fb_height; info.clearValueCount = 1; info.pClearValues = &g_ClearValue; vkCmdBeginRenderPass(g_CommandBuffer[g_FrameIndex], &info, VK_SUBPASS_CONTENTS_INLINE); } } static void frame_end() { VkResult err; vkCmdEndRenderPass(g_CommandBuffer[g_FrameIndex]); { VkPipelineStageFlags wait_stage = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT; VkSubmitInfo info = {}; info.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO; info.waitSemaphoreCount = 1; info.pWaitSemaphores = &g_PresentCompleteSemaphore[g_FrameIndex]; info.pWaitDstStageMask = &wait_stage; info.commandBufferCount = 1; info.pCommandBuffers = &g_CommandBuffer[g_FrameIndex]; info.signalSemaphoreCount = 1; info.pSignalSemaphores = &g_RenderCompleteSemaphore[g_FrameIndex]; err = vkEndCommandBuffer(g_CommandBuffer[g_FrameIndex]); check_vk_result(err); err = vkResetFences(g_Device, 1, &g_Fence[g_FrameIndex]); check_vk_result(err); err = vkQueueSubmit(g_Queue, 1, &info, g_Fence[g_FrameIndex]); check_vk_result(err); } } static void frame_present() { VkResult err; // If IMGUI_UNLIMITED_FRAME_RATE is defined we present the latest but one frame. Otherwise we present the latest rendered frame #ifdef IMGUI_UNLIMITED_FRAME_RATE uint32_t PresentIndex = (g_FrameIndex + IMGUI_VK_QUEUED_FRAMES - 1) % IMGUI_VK_QUEUED_FRAMES; #else uint32_t PresentIndex = g_FrameIndex; #endif // IMGUI_UNLIMITED_FRAME_RATE VkSwapchainKHR swapchains[1] = {g_Swapchain}; uint32_t indices[1] = {g_BackbufferIndices[PresentIndex]}; VkPresentInfoKHR info = {}; info.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR; info.waitSemaphoreCount = 1; info.pWaitSemaphores = &g_RenderCompleteSemaphore[PresentIndex]; info.swapchainCount = 1; info.pSwapchains = swapchains; info.pImageIndices = indices; err = vkQueuePresentKHR(g_Queue, &info); check_vk_result(err); g_FrameIndex = (g_FrameIndex + 1) % IMGUI_VK_QUEUED_FRAMES; } static void error_callback(int error, const char* description) { fprintf(stderr, "Error %d: %s\n", error, description); } int main(int, char**) { // Setup window glfwSetErrorCallback(error_callback); if (!glfwInit()) return 1; glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API); GLFWwindow* window = glfwCreateWindow(1280, 720, "ImGui Vulkan example", NULL, NULL); // Setup Vulkan if (!glfwVulkanSupported()) { printf("GLFW: Vulkan Not Supported\n"); return 1; } setup_vulkan(window); // Setup ImGui binding ImGui_ImplGlfwVulkan_Init_Data init_data = {}; init_data.allocator = g_Allocator; init_data.gpu = g_Gpu; init_data.device = g_Device; init_data.render_pass = g_RenderPass; init_data.pipeline_cache = g_PipelineCache; init_data.descriptor_pool = g_DescriptorPool; init_data.check_vk_result = check_vk_result; ImGui_ImplGlfwVulkan_Init(window, true, &init_data); // Load Fonts // (there is a default font, this is only if you want to change it. see extra_fonts/README.txt for more details) //ImGuiIO& io = ImGui::GetIO(); //io.Fonts->AddFontDefault(); //io.Fonts->AddFontFromFileTTF("../../extra_fonts/Cousine-Regular.ttf", 15.0f); //io.Fonts->AddFontFromFileTTF("../../extra_fonts/DroidSans.ttf", 16.0f); //io.Fonts->AddFontFromFileTTF("../../extra_fonts/Roboto-Medium.ttf", 16.0f); //io.Fonts->AddFontFromFileTTF("../../extra_fonts/ProggyTiny.ttf", 10.0f); //io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese()); // Upload Fonts { VkResult err; err = vkResetCommandPool(g_Device, g_CommandPool[g_FrameIndex], 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(g_CommandBuffer[g_FrameIndex], &begin_info); check_vk_result(err); ImGui_ImplGlfwVulkan_CreateFontsTexture(g_CommandBuffer[g_FrameIndex]); VkSubmitInfo end_info = {}; end_info.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO; end_info.commandBufferCount = 1; end_info.pCommandBuffers = &g_CommandBuffer[g_FrameIndex]; err = vkEndCommandBuffer(g_CommandBuffer[g_FrameIndex]); 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_ImplGlfwVulkan_InvalidateFontUploadObjects(); } bool show_test_window = true; bool show_another_window = false; ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f); // When IMGUI_UNLIMITED_FRAME_RATE is defined we render into latest image acquired from the swapchain but we display the image which was rendered before. // Hence we must render once and increase the g_FrameIndex without presenting, which we do before entering the render loop. // This is also the reason why frame_end() is split into frame_end() and frame_present(), the later one not being called here. #ifdef IMGUI_UNLIMITED_FRAME_RATE ImGui_ImplGlfwVulkan_NewFrame(); frame_begin(); ImGui_ImplGlfwVulkan_Render(g_CommandBuffer[g_FrameIndex]); frame_end(); g_FrameIndex = (g_FrameIndex + 1) % IMGUI_VK_QUEUED_FRAMES; #endif // IMGUI_UNLIMITED_FRAME_RATE // Main loop while (!glfwWindowShouldClose(window)) { glfwPollEvents(); ImGui_ImplGlfwVulkan_NewFrame(); // 1. Show a simple window // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug" { static float f = 0.0f; ImGui::Text("Hello, world!"); ImGui::SliderFloat("float", &f, 0.0f, 1.0f); ImGui::ColorEdit3("clear color", (float*)&clear_color); if (ImGui::Button("Test Window")) show_test_window ^= 1; if (ImGui::Button("Another Window")) show_another_window ^= 1; ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate); } // 2. Show another simple window, this time using an explicit Begin/End pair if (show_another_window) { ImGui::Begin("Another Window", &show_another_window); ImGui::Text("Hello from another window!"); ImGui::End(); } // 3. Show the ImGui test window. Most of the sample code is in ImGui::ShowTestWindow() if (show_test_window) { ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiCond_FirstUseEver); ImGui::ShowTestWindow(&show_test_window); } g_ClearValue.color.float32[0] = clear_color.x; g_ClearValue.color.float32[1] = clear_color.y; g_ClearValue.color.float32[2] = clear_color.z; g_ClearValue.color.float32[3] = clear_color.w; frame_begin(); ImGui_ImplGlfwVulkan_Render(g_CommandBuffer[g_FrameIndex]); frame_end(); frame_present(); } // Cleanup VkResult err = vkDeviceWaitIdle(g_Device); check_vk_result(err); ImGui_ImplGlfwVulkan_Shutdown(); cleanup_vulkan(); glfwTerminate(); return 0; }