// dear imgui: Renderer Backend for Vulkan // This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..) // Implemented features: // [!] Renderer: User texture binding. Use 'VkDescriptorSet' as ImTextureID. Call ImGui_ImplVulkan_AddTexture() to register one. Read the FAQ about ImTextureID! See https://github.com/ocornut/imgui/pull/914 for discussions. // [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset). // [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'. // The aim of imgui_impl_vulkan.h/.cpp is to be usable in your engine without any modification. // IF YOU FEEL YOU NEED TO MAKE ANY CHANGE TO THIS CODE, please share them and your feedback at https://github.com/ocornut/imgui/ // You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. // Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need. // Learn about Dear ImGui: // - FAQ https://dearimgui.com/faq // - Getting Started https://dearimgui.com/getting-started // - Documentation https://dearimgui.com/docs (same as your local docs/ folder). // - Introduction, links and more 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 backend in your engine/app. // - Helper ImGui_ImplVulkanH_XXX functions and structures are only used by this example (main.cpp) and by // the backend itself (imgui_impl_vulkan.cpp), but should PROBABLY NOT be used by your own engine/app code. // Read comments in imgui_impl_vulkan.h. #pragma once #ifndef IMGUI_DISABLE #include "imgui.h" // IMGUI_IMPL_API // [Configuration] in order to use a custom Vulkan function loader: // (1) You'll need to disable default Vulkan function prototypes. // We provide a '#define IMGUI_IMPL_VULKAN_NO_PROTOTYPES' convenience configuration flag. // In order to make sure this is visible from the imgui_impl_vulkan.cpp compilation unit: // - Add '#define IMGUI_IMPL_VULKAN_NO_PROTOTYPES' in your imconfig.h file // - Or as a compilation flag in your build system // - Or uncomment here (not recommended because you'd be modifying imgui sources!) // - Do not simply add it in a .cpp file! // (2) Call ImGui_ImplVulkan_LoadFunctions() before ImGui_ImplVulkan_Init() with your custom function. // If you have no idea what this is, leave it alone! //#define IMGUI_IMPL_VULKAN_NO_PROTOTYPES // Convenience support for Volk // (you can also technically use IMGUI_IMPL_VULKAN_NO_PROTOTYPES + wrap Volk via ImGui_ImplVulkan_LoadFunctions().) //#define IMGUI_IMPL_VULKAN_USE_VOLK #if defined(IMGUI_IMPL_VULKAN_NO_PROTOTYPES) && !defined(VK_NO_PROTOTYPES) #define VK_NO_PROTOTYPES #endif #if defined(VK_USE_PLATFORM_WIN32_KHR) && !defined(NOMINMAX) #define NOMINMAX #endif // Vulkan includes #ifdef IMGUI_IMPL_VULKAN_USE_VOLK #include <volk.h> #else #include <vulkan/vulkan.h> #endif #if defined(VK_VERSION_1_3) || defined(VK_KHR_dynamic_rendering) #define IMGUI_IMPL_VULKAN_HAS_DYNAMIC_RENDERING #endif // Initialization data, for ImGui_ImplVulkan_Init() // [Please zero-clear before use!] // - About descriptor pool: // - A VkDescriptorPool should be created with VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT, // and must contain a pool size large enough to hold a small number of VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER descriptors. // - As an convenience, by setting DescriptorPoolSize > 0 the backend will create one for you. // - Current version of the backend use 1 descriptor for the font atlas + as many as additional calls done to ImGui_ImplVulkan_AddTexture(). // - It is expected that as early as Q1 2025 the backend will use a few more descriptors, so aim at 10 + number of desierd calls to ImGui_ImplVulkan_AddTexture(). // - About dynamic rendering: // - When using dynamic rendering, set UseDynamicRendering=true and fill PipelineRenderingCreateInfo structure. struct ImGui_ImplVulkan_InitInfo { VkInstance Instance; VkPhysicalDevice PhysicalDevice; VkDevice Device; uint32_t QueueFamily; VkQueue Queue; VkDescriptorPool DescriptorPool; // See requirements in note above; ignored if using DescriptorPoolSize > 0 VkRenderPass RenderPass; // Ignored if using dynamic rendering uint32_t MinImageCount; // >= 2 uint32_t ImageCount; // >= MinImageCount VkSampleCountFlagBits MSAASamples; // 0 defaults to VK_SAMPLE_COUNT_1_BIT // (Optional) VkPipelineCache PipelineCache; uint32_t Subpass; // (Optional) Set to create internal descriptor pool instead of using DescriptorPool uint32_t DescriptorPoolSize; // (Optional) Dynamic Rendering // Need to explicitly enable VK_KHR_dynamic_rendering extension to use this, even for Vulkan 1.3. bool UseDynamicRendering; #ifdef IMGUI_IMPL_VULKAN_HAS_DYNAMIC_RENDERING VkPipelineRenderingCreateInfoKHR PipelineRenderingCreateInfo; #endif // (Optional) Allocation, Debugging const VkAllocationCallbacks* Allocator; void (*CheckVkResultFn)(VkResult err); VkDeviceSize MinAllocationSize; // Minimum allocation size. Set to 1024*1024 to satisfy zealous best practices validation layer and waste a little memory. }; // Follow "Getting Started" link and check examples/ folder to learn about using backends! IMGUI_IMPL_API bool ImGui_ImplVulkan_Init(ImGui_ImplVulkan_InitInfo* info); IMGUI_IMPL_API void ImGui_ImplVulkan_Shutdown(); IMGUI_IMPL_API void ImGui_ImplVulkan_NewFrame(); IMGUI_IMPL_API void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer command_buffer, VkPipeline pipeline = VK_NULL_HANDLE); IMGUI_IMPL_API bool ImGui_ImplVulkan_CreateFontsTexture(); IMGUI_IMPL_API void ImGui_ImplVulkan_DestroyFontsTexture(); IMGUI_IMPL_API void ImGui_ImplVulkan_SetMinImageCount(uint32_t min_image_count); // To override MinImageCount after initialization (e.g. if swap chain is recreated) // Register a texture (VkDescriptorSet == ImTextureID) // FIXME: This is experimental in the sense that we are unsure how to best design/tackle this problem // Please post to https://github.com/ocornut/imgui/pull/914 if you have suggestions. IMGUI_IMPL_API VkDescriptorSet ImGui_ImplVulkan_AddTexture(VkSampler sampler, VkImageView image_view, VkImageLayout image_layout); IMGUI_IMPL_API void ImGui_ImplVulkan_RemoveTexture(VkDescriptorSet descriptor_set); // Optional: load Vulkan functions with a custom function loader // This is only useful with IMGUI_IMPL_VULKAN_NO_PROTOTYPES / VK_NO_PROTOTYPES IMGUI_IMPL_API bool ImGui_ImplVulkan_LoadFunctions(PFN_vkVoidFunction(*loader_func)(const char* function_name, void* user_data), void* user_data = nullptr); // [BETA] Selected render state data shared with callbacks. // This is temporarily stored in GetPlatformIO().Renderer_RenderState during the ImGui_ImplVulkan_RenderDrawData() call. // (Please open an issue if you feel you need access to more data) struct ImGui_ImplVulkan_RenderState { VkCommandBuffer CommandBuffer; VkPipeline Pipeline; VkPipelineLayout PipelineLayout; }; //------------------------------------------------------------------------- // Internal / Miscellaneous Vulkan Helpers // (Used by example's main.cpp. Used by multi-viewport features. PROBABLY NOT used by your own engine/app.) //------------------------------------------------------------------------- // You probably do NOT need to use or care about those functions. // Those functions only exist because: // 1) they facilitate the readability and maintenance of the multiple main.cpp examples files. // 2) the multi-viewport / platform window implementation needs them internally. // Generally we avoid exposing any kind of superfluous high-level helpers in the bindings, // but it is too much code to duplicate everywhere so we exceptionally expose them. // // Your engine/app will likely _already_ have code to setup all that stuff (swap chain, render pass, frame buffers, etc.). // You may read this code to learn about Vulkan, but it is recommended you use you own custom tailored code to do equivalent work. // (The ImGui_ImplVulkanH_XXX functions do not interact with any of the state used by the regular ImGui_ImplVulkan_XXX functions) //------------------------------------------------------------------------- struct ImGui_ImplVulkanH_Frame; struct ImGui_ImplVulkanH_Window; // Helpers IMGUI_IMPL_API void ImGui_ImplVulkanH_CreateOrResizeWindow(VkInstance instance, VkPhysicalDevice physical_device, VkDevice device, ImGui_ImplVulkanH_Window* wnd, uint32_t queue_family, const VkAllocationCallbacks* allocator, int w, int h, uint32_t min_image_count); IMGUI_IMPL_API void ImGui_ImplVulkanH_DestroyWindow(VkInstance instance, VkDevice device, ImGui_ImplVulkanH_Window* wnd, const VkAllocationCallbacks* allocator); IMGUI_IMPL_API VkSurfaceFormatKHR ImGui_ImplVulkanH_SelectSurfaceFormat(VkPhysicalDevice physical_device, VkSurfaceKHR surface, const VkFormat* request_formats, int request_formats_count, VkColorSpaceKHR request_color_space); IMGUI_IMPL_API VkPresentModeKHR ImGui_ImplVulkanH_SelectPresentMode(VkPhysicalDevice physical_device, VkSurfaceKHR surface, const VkPresentModeKHR* request_modes, int request_modes_count); IMGUI_IMPL_API int ImGui_ImplVulkanH_GetMinImageCountFromPresentMode(VkPresentModeKHR present_mode); // Helper structure to hold the data needed by one rendering frame // (Used by example's main.cpp. Used by multi-viewport features. Probably NOT used by your own engine/app.) // [Please zero-clear before use!] struct ImGui_ImplVulkanH_Frame { VkCommandPool CommandPool; VkCommandBuffer CommandBuffer; VkFence Fence; VkImage Backbuffer; VkImageView BackbufferView; VkFramebuffer Framebuffer; }; struct ImGui_ImplVulkanH_FrameSemaphores { VkSemaphore ImageAcquiredSemaphore; VkSemaphore RenderCompleteSemaphore; }; // Helper structure to hold the data needed by one rendering context into one OS window // (Used by example's main.cpp. Used by multi-viewport features. Probably NOT used by your own engine/app.) struct ImGui_ImplVulkanH_Window { int Width; int Height; VkSwapchainKHR Swapchain; VkSurfaceKHR Surface; VkSurfaceFormatKHR SurfaceFormat; VkPresentModeKHR PresentMode; VkRenderPass RenderPass; VkPipeline Pipeline; // The window pipeline may uses a different VkRenderPass than the one passed in ImGui_ImplVulkan_InitInfo bool UseDynamicRendering; bool ClearEnable; VkClearValue ClearValue; uint32_t FrameIndex; // Current frame being rendered to (0 <= FrameIndex < FrameInFlightCount) uint32_t ImageCount; // Number of simultaneous in-flight frames (returned by vkGetSwapchainImagesKHR, usually derived from min_image_count) uint32_t SemaphoreCount; // Number of simultaneous in-flight frames + 1, to be able to use it in vkAcquireNextImageKHR uint32_t SemaphoreIndex; // Current set of swapchain wait semaphores we're using (needs to be distinct from per frame data) ImGui_ImplVulkanH_Frame* Frames; ImGui_ImplVulkanH_FrameSemaphores* FrameSemaphores; ImGui_ImplVulkanH_Window() { memset((void*)this, 0, sizeof(*this)); PresentMode = (VkPresentModeKHR)~0; // Ensure we get an error if user doesn't set this. ClearEnable = true; } }; #endif // #ifndef IMGUI_DISABLE