// dear imgui: Renderer Backend for DirectX12 // This needs to be used along with a Platform Backend (e.g. Win32) // Implemented features: // [X] Renderer: User texture binding. Use 'D3D12_GPU_DESCRIPTOR_HANDLE' as ImTextureID. Read the FAQ about ImTextureID! // [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices. // [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'. // FIXME: The transition from removing a viewport and moving the window in an existing hosted viewport tends to flicker. // Important: to compile on 32-bit systems, this backend requires code to be compiled with '#define ImTextureID ImU64'. // This is because we need ImTextureID to carry a 64-bit value and by default ImTextureID is defined as void*. // To build this on 32-bit systems: // - [Solution 1] IDE/msbuild: in "Properties/C++/Preprocessor Definitions" add 'ImTextureID=ImU64' (this is what we do in the 'example_win32_direct12/example_win32_direct12.vcxproj' project file) // - [Solution 2] IDE/msbuild: in "Properties/C++/Preprocessor Definitions" add 'IMGUI_USER_CONFIG="my_imgui_config.h"' and inside 'my_imgui_config.h' add '#define ImTextureID ImU64' and as many other options as you like. // - [Solution 3] IDE/msbuild: edit imconfig.h and add '#define ImTextureID ImU64' (prefer solution 2 to create your own config file!) // - [Solution 4] command-line: add '/D ImTextureID=ImU64' to your cl.exe command-line (this is what we do in the example_win32_direct12/build_win32.bat file) // 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. // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp. // Read online: https://github.com/ocornut/imgui/tree/master/docs // CHANGELOG // (minor and older changes stripped away, please see git history for details) // 2023-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface. // 2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11. // 2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX). // 2021-05-19: DirectX12: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement) // 2021-02-18: DirectX12: Change blending equation to preserve alpha in output buffer. // 2021-01-11: DirectX12: Improve Windows 7 compatibility (for D3D12On7) by loading d3d12.dll dynamically. // 2020-09-16: DirectX12: Avoid rendering calls with zero-sized scissor rectangle since it generates a validation layer warning. // 2020-09-08: DirectX12: Clarified support for building on 32-bit systems by redefining ImTextureID. // 2019-10-18: DirectX12: *BREAKING CHANGE* Added extra ID3D12DescriptorHeap parameter to ImGui_ImplDX12_Init() function. // 2019-05-29: DirectX12: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag. // 2019-04-30: DirectX12: Added support for special ImDrawCallback_ResetRenderState callback to reset render state. // 2019-03-29: Misc: Various minor tidying up. // 2018-12-03: Misc: Added #pragma comment statement to automatically link with d3dcompiler.lib when using D3DCompile(). // 2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window. // 2018-06-12: DirectX12: Moved the ID3D12GraphicsCommandList* parameter from NewFrame() to RenderDrawData(). // 2018-06-08: Misc: Extracted imgui_impl_dx12.cpp/.h away from the old combined DX12+Win32 example. // 2018-06-08: DirectX12: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle (to ease support for future multi-viewport). // 2018-02-22: Merged into master with all Win32 code synchronized to other examples. #include "imgui.h" #include "imgui_impl_dx12.h" // DirectX #include #include #include #ifdef _MSC_VER #pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below. #endif // DirectX data struct ImGui_ImplDX12_Data { ID3D12Device* pd3dDevice; ID3D12RootSignature* pRootSignature; ID3D12PipelineState* pPipelineState; DXGI_FORMAT RTVFormat; ID3D12Resource* pFontTextureResource; D3D12_CPU_DESCRIPTOR_HANDLE hFontSrvCpuDescHandle; D3D12_GPU_DESCRIPTOR_HANDLE hFontSrvGpuDescHandle; ID3D12DescriptorHeap* pd3dSrvDescHeap; UINT numFramesInFlight; ImGui_ImplDX12_Data() { memset((void*)this, 0, sizeof(*this)); } }; // Backend data stored in io.BackendRendererUserData to allow support for multiple Dear ImGui contexts // It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts. static ImGui_ImplDX12_Data* ImGui_ImplDX12_GetBackendData() { return ImGui::GetCurrentContext() ? (ImGui_ImplDX12_Data*)ImGui::GetIO().BackendRendererUserData : nullptr; } // Buffers used during the rendering of a frame struct ImGui_ImplDX12_RenderBuffers { ID3D12Resource* IndexBuffer; ID3D12Resource* VertexBuffer; int IndexBufferSize; int VertexBufferSize; }; // Buffers used for secondary viewports created by the multi-viewports systems struct ImGui_ImplDX12_FrameContext { ID3D12CommandAllocator* CommandAllocator; ID3D12Resource* RenderTarget; D3D12_CPU_DESCRIPTOR_HANDLE RenderTargetCpuDescriptors; }; // Helper structure we store in the void* RendererUserData field of each ImGuiViewport to easily retrieve our backend data. // Main viewport created by application will only use the Resources field. // Secondary viewports created by this backend will use all the fields (including Window fields), struct ImGui_ImplDX12_ViewportData { // Window ID3D12CommandQueue* CommandQueue; ID3D12GraphicsCommandList* CommandList; ID3D12DescriptorHeap* RtvDescHeap; IDXGISwapChain3* SwapChain; ID3D12Fence* Fence; UINT64 FenceSignaledValue; HANDLE FenceEvent; UINT NumFramesInFlight; ImGui_ImplDX12_FrameContext* FrameCtx; // Render buffers UINT FrameIndex; ImGui_ImplDX12_RenderBuffers* FrameRenderBuffers; ImGui_ImplDX12_ViewportData(UINT num_frames_in_flight) { CommandQueue = nullptr; CommandList = nullptr; RtvDescHeap = nullptr; SwapChain = nullptr; Fence = nullptr; FenceSignaledValue = 0; FenceEvent = nullptr; NumFramesInFlight = num_frames_in_flight; FrameCtx = new ImGui_ImplDX12_FrameContext[NumFramesInFlight]; FrameIndex = UINT_MAX; FrameRenderBuffers = new ImGui_ImplDX12_RenderBuffers[NumFramesInFlight]; for (UINT i = 0; i < NumFramesInFlight; ++i) { FrameCtx[i].CommandAllocator = nullptr; FrameCtx[i].RenderTarget = nullptr; // Create buffers with a default size (they will later be grown as needed) FrameRenderBuffers[i].IndexBuffer = nullptr; FrameRenderBuffers[i].VertexBuffer = nullptr; FrameRenderBuffers[i].VertexBufferSize = 5000; FrameRenderBuffers[i].IndexBufferSize = 10000; } } ~ImGui_ImplDX12_ViewportData() { IM_ASSERT(CommandQueue == nullptr && CommandList == nullptr); IM_ASSERT(RtvDescHeap == nullptr); IM_ASSERT(SwapChain == nullptr); IM_ASSERT(Fence == nullptr); IM_ASSERT(FenceEvent == nullptr); for (UINT i = 0; i < NumFramesInFlight; ++i) { IM_ASSERT(FrameCtx[i].CommandAllocator == nullptr && FrameCtx[i].RenderTarget == nullptr); IM_ASSERT(FrameRenderBuffers[i].IndexBuffer == nullptr && FrameRenderBuffers[i].VertexBuffer == nullptr); } delete[] FrameCtx; FrameCtx = nullptr; delete[] FrameRenderBuffers; FrameRenderBuffers = nullptr; } }; struct VERTEX_CONSTANT_BUFFER_DX12 { float mvp[4][4]; }; // Forward Declarations static void ImGui_ImplDX12_InitPlatformInterface(); static void ImGui_ImplDX12_ShutdownPlatformInterface(); // Functions static void ImGui_ImplDX12_SetupRenderState(ImDrawData* draw_data, ID3D12GraphicsCommandList* ctx, ImGui_ImplDX12_RenderBuffers* fr) { ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); // Setup orthographic projection matrix into our constant buffer // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). VERTEX_CONSTANT_BUFFER_DX12 vertex_constant_buffer; { float L = draw_data->DisplayPos.x; float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x; float T = draw_data->DisplayPos.y; float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y; float mvp[4][4] = { { 2.0f/(R-L), 0.0f, 0.0f, 0.0f }, { 0.0f, 2.0f/(T-B), 0.0f, 0.0f }, { 0.0f, 0.0f, 0.5f, 0.0f }, { (R+L)/(L-R), (T+B)/(B-T), 0.5f, 1.0f }, }; memcpy(&vertex_constant_buffer.mvp, mvp, sizeof(mvp)); } // Setup viewport D3D12_VIEWPORT vp; memset(&vp, 0, sizeof(D3D12_VIEWPORT)); vp.Width = draw_data->DisplaySize.x; vp.Height = draw_data->DisplaySize.y; vp.MinDepth = 0.0f; vp.MaxDepth = 1.0f; vp.TopLeftX = vp.TopLeftY = 0.0f; ctx->RSSetViewports(1, &vp); // Bind shader and vertex buffers unsigned int stride = sizeof(ImDrawVert); unsigned int offset = 0; D3D12_VERTEX_BUFFER_VIEW vbv; memset(&vbv, 0, sizeof(D3D12_VERTEX_BUFFER_VIEW)); vbv.BufferLocation = fr->VertexBuffer->GetGPUVirtualAddress() + offset; vbv.SizeInBytes = fr->VertexBufferSize * stride; vbv.StrideInBytes = stride; ctx->IASetVertexBuffers(0, 1, &vbv); D3D12_INDEX_BUFFER_VIEW ibv; memset(&ibv, 0, sizeof(D3D12_INDEX_BUFFER_VIEW)); ibv.BufferLocation = fr->IndexBuffer->GetGPUVirtualAddress(); ibv.SizeInBytes = fr->IndexBufferSize * sizeof(ImDrawIdx); ibv.Format = sizeof(ImDrawIdx) == 2 ? DXGI_FORMAT_R16_UINT : DXGI_FORMAT_R32_UINT; ctx->IASetIndexBuffer(&ibv); ctx->IASetPrimitiveTopology(D3D_PRIMITIVE_TOPOLOGY_TRIANGLELIST); ctx->SetPipelineState(bd->pPipelineState); ctx->SetGraphicsRootSignature(bd->pRootSignature); ctx->SetGraphicsRoot32BitConstants(0, 16, &vertex_constant_buffer, 0); // Setup blend factor const float blend_factor[4] = { 0.f, 0.f, 0.f, 0.f }; ctx->OMSetBlendFactor(blend_factor); } template static inline void SafeRelease(T*& res) { if (res) res->Release(); res = nullptr; } // Render function void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandList* ctx) { // Avoid rendering when minimized if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f) return; ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)draw_data->OwnerViewport->RendererUserData; vd->FrameIndex++; ImGui_ImplDX12_RenderBuffers* fr = &vd->FrameRenderBuffers[vd->FrameIndex % bd->numFramesInFlight]; // Create and grow vertex/index buffers if needed if (fr->VertexBuffer == nullptr || fr->VertexBufferSize < draw_data->TotalVtxCount) { SafeRelease(fr->VertexBuffer); fr->VertexBufferSize = draw_data->TotalVtxCount + 5000; D3D12_HEAP_PROPERTIES props; memset(&props, 0, sizeof(D3D12_HEAP_PROPERTIES)); props.Type = D3D12_HEAP_TYPE_UPLOAD; props.CPUPageProperty = D3D12_CPU_PAGE_PROPERTY_UNKNOWN; props.MemoryPoolPreference = D3D12_MEMORY_POOL_UNKNOWN; D3D12_RESOURCE_DESC desc; memset(&desc, 0, sizeof(D3D12_RESOURCE_DESC)); desc.Dimension = D3D12_RESOURCE_DIMENSION_BUFFER; desc.Width = fr->VertexBufferSize * sizeof(ImDrawVert); desc.Height = 1; desc.DepthOrArraySize = 1; desc.MipLevels = 1; desc.Format = DXGI_FORMAT_UNKNOWN; desc.SampleDesc.Count = 1; desc.Layout = D3D12_TEXTURE_LAYOUT_ROW_MAJOR; desc.Flags = D3D12_RESOURCE_FLAG_NONE; if (bd->pd3dDevice->CreateCommittedResource(&props, D3D12_HEAP_FLAG_NONE, &desc, D3D12_RESOURCE_STATE_GENERIC_READ, nullptr, IID_PPV_ARGS(&fr->VertexBuffer)) < 0) return; } if (fr->IndexBuffer == nullptr || fr->IndexBufferSize < draw_data->TotalIdxCount) { SafeRelease(fr->IndexBuffer); fr->IndexBufferSize = draw_data->TotalIdxCount + 10000; D3D12_HEAP_PROPERTIES props; memset(&props, 0, sizeof(D3D12_HEAP_PROPERTIES)); props.Type = D3D12_HEAP_TYPE_UPLOAD; props.CPUPageProperty = D3D12_CPU_PAGE_PROPERTY_UNKNOWN; props.MemoryPoolPreference = D3D12_MEMORY_POOL_UNKNOWN; D3D12_RESOURCE_DESC desc; memset(&desc, 0, sizeof(D3D12_RESOURCE_DESC)); desc.Dimension = D3D12_RESOURCE_DIMENSION_BUFFER; desc.Width = fr->IndexBufferSize * sizeof(ImDrawIdx); desc.Height = 1; desc.DepthOrArraySize = 1; desc.MipLevels = 1; desc.Format = DXGI_FORMAT_UNKNOWN; desc.SampleDesc.Count = 1; desc.Layout = D3D12_TEXTURE_LAYOUT_ROW_MAJOR; desc.Flags = D3D12_RESOURCE_FLAG_NONE; if (bd->pd3dDevice->CreateCommittedResource(&props, D3D12_HEAP_FLAG_NONE, &desc, D3D12_RESOURCE_STATE_GENERIC_READ, nullptr, IID_PPV_ARGS(&fr->IndexBuffer)) < 0) return; } // Upload vertex/index data into a single contiguous GPU buffer void* vtx_resource, *idx_resource; D3D12_RANGE range; memset(&range, 0, sizeof(D3D12_RANGE)); if (fr->VertexBuffer->Map(0, &range, &vtx_resource) != S_OK) return; if (fr->IndexBuffer->Map(0, &range, &idx_resource) != S_OK) return; ImDrawVert* vtx_dst = (ImDrawVert*)vtx_resource; ImDrawIdx* idx_dst = (ImDrawIdx*)idx_resource; for (int n = 0; n < draw_data->CmdListsCount; n++) { const ImDrawList* cmd_list = draw_data->CmdLists[n]; memcpy(vtx_dst, cmd_list->VtxBuffer.Data, cmd_list->VtxBuffer.Size * sizeof(ImDrawVert)); memcpy(idx_dst, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx)); vtx_dst += cmd_list->VtxBuffer.Size; idx_dst += cmd_list->IdxBuffer.Size; } fr->VertexBuffer->Unmap(0, &range); fr->IndexBuffer->Unmap(0, &range); // Setup desired DX state ImGui_ImplDX12_SetupRenderState(draw_data, ctx, fr); // Render command lists // (Because we merged all buffers into a single one, we maintain our own offset into them) int global_vtx_offset = 0; int global_idx_offset = 0; ImVec2 clip_off = draw_data->DisplayPos; for (int n = 0; n < draw_data->CmdListsCount; n++) { const ImDrawList* cmd_list = draw_data->CmdLists[n]; for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++) { const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i]; if (pcmd->UserCallback != nullptr) { // User callback, registered via ImDrawList::AddCallback() // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.) if (pcmd->UserCallback == ImDrawCallback_ResetRenderState) ImGui_ImplDX12_SetupRenderState(draw_data, ctx, fr); else pcmd->UserCallback(cmd_list, pcmd); } else { // Project scissor/clipping rectangles into framebuffer space ImVec2 clip_min(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y); ImVec2 clip_max(pcmd->ClipRect.z - clip_off.x, pcmd->ClipRect.w - clip_off.y); if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y) continue; // Apply Scissor/clipping rectangle, Bind texture, Draw const D3D12_RECT r = { (LONG)clip_min.x, (LONG)clip_min.y, (LONG)clip_max.x, (LONG)clip_max.y }; D3D12_GPU_DESCRIPTOR_HANDLE texture_handle = {}; texture_handle.ptr = (UINT64)pcmd->GetTexID(); ctx->SetGraphicsRootDescriptorTable(1, texture_handle); ctx->RSSetScissorRects(1, &r); ctx->DrawIndexedInstanced(pcmd->ElemCount, 1, pcmd->IdxOffset + global_idx_offset, pcmd->VtxOffset + global_vtx_offset, 0); } } global_idx_offset += cmd_list->IdxBuffer.Size; global_vtx_offset += cmd_list->VtxBuffer.Size; } } static void ImGui_ImplDX12_CreateFontsTexture() { // Build texture atlas ImGuiIO& io = ImGui::GetIO(); ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); unsigned char* pixels; int width, height; io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Upload texture to graphics system { D3D12_HEAP_PROPERTIES props; memset(&props, 0, sizeof(D3D12_HEAP_PROPERTIES)); props.Type = D3D12_HEAP_TYPE_DEFAULT; props.CPUPageProperty = D3D12_CPU_PAGE_PROPERTY_UNKNOWN; props.MemoryPoolPreference = D3D12_MEMORY_POOL_UNKNOWN; D3D12_RESOURCE_DESC desc; ZeroMemory(&desc, sizeof(desc)); desc.Dimension = D3D12_RESOURCE_DIMENSION_TEXTURE2D; desc.Alignment = 0; desc.Width = width; desc.Height = height; desc.DepthOrArraySize = 1; desc.MipLevels = 1; desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM; desc.SampleDesc.Count = 1; desc.SampleDesc.Quality = 0; desc.Layout = D3D12_TEXTURE_LAYOUT_UNKNOWN; desc.Flags = D3D12_RESOURCE_FLAG_NONE; ID3D12Resource* pTexture = nullptr; bd->pd3dDevice->CreateCommittedResource(&props, D3D12_HEAP_FLAG_NONE, &desc, D3D12_RESOURCE_STATE_COPY_DEST, nullptr, IID_PPV_ARGS(&pTexture)); UINT uploadPitch = (width * 4 + D3D12_TEXTURE_DATA_PITCH_ALIGNMENT - 1u) & ~(D3D12_TEXTURE_DATA_PITCH_ALIGNMENT - 1u); UINT uploadSize = height * uploadPitch; desc.Dimension = D3D12_RESOURCE_DIMENSION_BUFFER; desc.Alignment = 0; desc.Width = uploadSize; desc.Height = 1; desc.DepthOrArraySize = 1; desc.MipLevels = 1; desc.Format = DXGI_FORMAT_UNKNOWN; desc.SampleDesc.Count = 1; desc.SampleDesc.Quality = 0; desc.Layout = D3D12_TEXTURE_LAYOUT_ROW_MAJOR; desc.Flags = D3D12_RESOURCE_FLAG_NONE; props.Type = D3D12_HEAP_TYPE_UPLOAD; props.CPUPageProperty = D3D12_CPU_PAGE_PROPERTY_UNKNOWN; props.MemoryPoolPreference = D3D12_MEMORY_POOL_UNKNOWN; ID3D12Resource* uploadBuffer = nullptr; HRESULT hr = bd->pd3dDevice->CreateCommittedResource(&props, D3D12_HEAP_FLAG_NONE, &desc, D3D12_RESOURCE_STATE_GENERIC_READ, nullptr, IID_PPV_ARGS(&uploadBuffer)); IM_ASSERT(SUCCEEDED(hr)); void* mapped = nullptr; D3D12_RANGE range = { 0, uploadSize }; hr = uploadBuffer->Map(0, &range, &mapped); IM_ASSERT(SUCCEEDED(hr)); for (int y = 0; y < height; y++) memcpy((void*) ((uintptr_t) mapped + y * uploadPitch), pixels + y * width * 4, width * 4); uploadBuffer->Unmap(0, &range); D3D12_TEXTURE_COPY_LOCATION srcLocation = {}; srcLocation.pResource = uploadBuffer; srcLocation.Type = D3D12_TEXTURE_COPY_TYPE_PLACED_FOOTPRINT; srcLocation.PlacedFootprint.Footprint.Format = DXGI_FORMAT_R8G8B8A8_UNORM; srcLocation.PlacedFootprint.Footprint.Width = width; srcLocation.PlacedFootprint.Footprint.Height = height; srcLocation.PlacedFootprint.Footprint.Depth = 1; srcLocation.PlacedFootprint.Footprint.RowPitch = uploadPitch; D3D12_TEXTURE_COPY_LOCATION dstLocation = {}; dstLocation.pResource = pTexture; dstLocation.Type = D3D12_TEXTURE_COPY_TYPE_SUBRESOURCE_INDEX; dstLocation.SubresourceIndex = 0; D3D12_RESOURCE_BARRIER barrier = {}; barrier.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION; barrier.Flags = D3D12_RESOURCE_BARRIER_FLAG_NONE; barrier.Transition.pResource = pTexture; barrier.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES; barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_COPY_DEST; barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE; ID3D12Fence* fence = nullptr; hr = bd->pd3dDevice->CreateFence(0, D3D12_FENCE_FLAG_NONE, IID_PPV_ARGS(&fence)); IM_ASSERT(SUCCEEDED(hr)); HANDLE event = CreateEvent(0, 0, 0, 0); IM_ASSERT(event != nullptr); D3D12_COMMAND_QUEUE_DESC queueDesc = {}; queueDesc.Type = D3D12_COMMAND_LIST_TYPE_DIRECT; queueDesc.Flags = D3D12_COMMAND_QUEUE_FLAG_NONE; queueDesc.NodeMask = 1; ID3D12CommandQueue* cmdQueue = nullptr; hr = bd->pd3dDevice->CreateCommandQueue(&queueDesc, IID_PPV_ARGS(&cmdQueue)); IM_ASSERT(SUCCEEDED(hr)); ID3D12CommandAllocator* cmdAlloc = nullptr; hr = bd->pd3dDevice->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT, IID_PPV_ARGS(&cmdAlloc)); IM_ASSERT(SUCCEEDED(hr)); ID3D12GraphicsCommandList* cmdList = nullptr; hr = bd->pd3dDevice->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, cmdAlloc, nullptr, IID_PPV_ARGS(&cmdList)); IM_ASSERT(SUCCEEDED(hr)); cmdList->CopyTextureRegion(&dstLocation, 0, 0, 0, &srcLocation, nullptr); cmdList->ResourceBarrier(1, &barrier); hr = cmdList->Close(); IM_ASSERT(SUCCEEDED(hr)); cmdQueue->ExecuteCommandLists(1, (ID3D12CommandList* const*)&cmdList); hr = cmdQueue->Signal(fence, 1); IM_ASSERT(SUCCEEDED(hr)); fence->SetEventOnCompletion(1, event); WaitForSingleObject(event, INFINITE); cmdList->Release(); cmdAlloc->Release(); cmdQueue->Release(); CloseHandle(event); fence->Release(); uploadBuffer->Release(); // Create texture view D3D12_SHADER_RESOURCE_VIEW_DESC srvDesc; ZeroMemory(&srvDesc, sizeof(srvDesc)); srvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM; srvDesc.ViewDimension = D3D12_SRV_DIMENSION_TEXTURE2D; srvDesc.Texture2D.MipLevels = desc.MipLevels; srvDesc.Texture2D.MostDetailedMip = 0; srvDesc.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING; bd->pd3dDevice->CreateShaderResourceView(pTexture, &srvDesc, bd->hFontSrvCpuDescHandle); SafeRelease(bd->pFontTextureResource); bd->pFontTextureResource = pTexture; } // Store our identifier // READ THIS IF THE STATIC_ASSERT() TRIGGERS: // - Important: to compile on 32-bit systems, this backend requires code to be compiled with '#define ImTextureID ImU64'. // - This is because we need ImTextureID to carry a 64-bit value and by default ImTextureID is defined as void*. // [Solution 1] IDE/msbuild: in "Properties/C++/Preprocessor Definitions" add 'ImTextureID=ImU64' (this is what we do in the 'example_win32_direct12/example_win32_direct12.vcxproj' project file) // [Solution 2] IDE/msbuild: in "Properties/C++/Preprocessor Definitions" add 'IMGUI_USER_CONFIG="my_imgui_config.h"' and inside 'my_imgui_config.h' add '#define ImTextureID ImU64' and as many other options as you like. // [Solution 3] IDE/msbuild: edit imconfig.h and add '#define ImTextureID ImU64' (prefer solution 2 to create your own config file!) // [Solution 4] command-line: add '/D ImTextureID=ImU64' to your cl.exe command-line (this is what we do in the example_win32_direct12/build_win32.bat file) static_assert(sizeof(ImTextureID) >= sizeof(bd->hFontSrvGpuDescHandle.ptr), "Can't pack descriptor handle into TexID, 32-bit not supported yet."); io.Fonts->SetTexID((ImTextureID)bd->hFontSrvGpuDescHandle.ptr); } bool ImGui_ImplDX12_CreateDeviceObjects() { ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); if (!bd || !bd->pd3dDevice) return false; if (bd->pPipelineState) ImGui_ImplDX12_InvalidateDeviceObjects(); // Create the root signature { D3D12_DESCRIPTOR_RANGE descRange = {}; descRange.RangeType = D3D12_DESCRIPTOR_RANGE_TYPE_SRV; descRange.NumDescriptors = 1; descRange.BaseShaderRegister = 0; descRange.RegisterSpace = 0; descRange.OffsetInDescriptorsFromTableStart = 0; D3D12_ROOT_PARAMETER param[2] = {}; param[0].ParameterType = D3D12_ROOT_PARAMETER_TYPE_32BIT_CONSTANTS; param[0].Constants.ShaderRegister = 0; param[0].Constants.RegisterSpace = 0; param[0].Constants.Num32BitValues = 16; param[0].ShaderVisibility = D3D12_SHADER_VISIBILITY_VERTEX; param[1].ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE; param[1].DescriptorTable.NumDescriptorRanges = 1; param[1].DescriptorTable.pDescriptorRanges = &descRange; param[1].ShaderVisibility = D3D12_SHADER_VISIBILITY_PIXEL; // Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling. D3D12_STATIC_SAMPLER_DESC staticSampler = {}; staticSampler.Filter = D3D12_FILTER_MIN_MAG_MIP_LINEAR; staticSampler.AddressU = D3D12_TEXTURE_ADDRESS_MODE_WRAP; staticSampler.AddressV = D3D12_TEXTURE_ADDRESS_MODE_WRAP; staticSampler.AddressW = D3D12_TEXTURE_ADDRESS_MODE_WRAP; staticSampler.MipLODBias = 0.f; staticSampler.MaxAnisotropy = 0; staticSampler.ComparisonFunc = D3D12_COMPARISON_FUNC_ALWAYS; staticSampler.BorderColor = D3D12_STATIC_BORDER_COLOR_TRANSPARENT_BLACK; staticSampler.MinLOD = 0.f; staticSampler.MaxLOD = 0.f; staticSampler.ShaderRegister = 0; staticSampler.RegisterSpace = 0; staticSampler.ShaderVisibility = D3D12_SHADER_VISIBILITY_PIXEL; D3D12_ROOT_SIGNATURE_DESC desc = {}; desc.NumParameters = _countof(param); desc.pParameters = param; desc.NumStaticSamplers = 1; desc.pStaticSamplers = &staticSampler; desc.Flags = D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT | D3D12_ROOT_SIGNATURE_FLAG_DENY_HULL_SHADER_ROOT_ACCESS | D3D12_ROOT_SIGNATURE_FLAG_DENY_DOMAIN_SHADER_ROOT_ACCESS | D3D12_ROOT_SIGNATURE_FLAG_DENY_GEOMETRY_SHADER_ROOT_ACCESS; // Load d3d12.dll and D3D12SerializeRootSignature() function address dynamically to facilitate using with D3D12On7. // See if any version of d3d12.dll is already loaded in the process. If so, give preference to that. static HINSTANCE d3d12_dll = ::GetModuleHandleA("d3d12.dll"); if (d3d12_dll == nullptr) { // Attempt to load d3d12.dll from local directories. This will only succeed if // (1) the current OS is Windows 7, and // (2) there exists a version of d3d12.dll for Windows 7 (D3D12On7) in one of the following directories. // See https://github.com/ocornut/imgui/pull/3696 for details. const char* localD3d12Paths[] = { ".\\d3d12.dll", ".\\d3d12on7\\d3d12.dll", ".\\12on7\\d3d12.dll" }; // A. current directory, B. used by some games, C. used in Microsoft D3D12On7 sample for (int i = 0; i < IM_ARRAYSIZE(localD3d12Paths); i++) if ((d3d12_dll = ::LoadLibraryA(localD3d12Paths[i])) != nullptr) break; // If failed, we are on Windows >= 10. if (d3d12_dll == nullptr) d3d12_dll = ::LoadLibraryA("d3d12.dll"); if (d3d12_dll == nullptr) return false; } PFN_D3D12_SERIALIZE_ROOT_SIGNATURE D3D12SerializeRootSignatureFn = (PFN_D3D12_SERIALIZE_ROOT_SIGNATURE)::GetProcAddress(d3d12_dll, "D3D12SerializeRootSignature"); if (D3D12SerializeRootSignatureFn == nullptr) return false; ID3DBlob* blob = nullptr; if (D3D12SerializeRootSignatureFn(&desc, D3D_ROOT_SIGNATURE_VERSION_1, &blob, nullptr) != S_OK) return false; bd->pd3dDevice->CreateRootSignature(0, blob->GetBufferPointer(), blob->GetBufferSize(), IID_PPV_ARGS(&bd->pRootSignature)); blob->Release(); } // By using D3DCompile() from / d3dcompiler.lib, we introduce a dependency to a given version of d3dcompiler_XX.dll (see D3DCOMPILER_DLL_A) // If you would like to use this DX12 sample code but remove this dependency you can: // 1) compile once, save the compiled shader blobs into a file or source code and assign them to psoDesc.VS/PS [preferred solution] // 2) use code to detect any version of the DLL and grab a pointer to D3DCompile from the DLL. // See https://github.com/ocornut/imgui/pull/638 for sources and details. D3D12_GRAPHICS_PIPELINE_STATE_DESC psoDesc; memset(&psoDesc, 0, sizeof(D3D12_GRAPHICS_PIPELINE_STATE_DESC)); psoDesc.NodeMask = 1; psoDesc.PrimitiveTopologyType = D3D12_PRIMITIVE_TOPOLOGY_TYPE_TRIANGLE; psoDesc.pRootSignature = bd->pRootSignature; psoDesc.SampleMask = UINT_MAX; psoDesc.NumRenderTargets = 1; psoDesc.RTVFormats[0] = bd->RTVFormat; psoDesc.SampleDesc.Count = 1; psoDesc.Flags = D3D12_PIPELINE_STATE_FLAG_NONE; ID3DBlob* vertexShaderBlob; ID3DBlob* pixelShaderBlob; // Create the vertex shader { static const char* vertexShader = "cbuffer vertexBuffer : register(b0) \ {\ float4x4 ProjectionMatrix; \ };\ struct VS_INPUT\ {\ float2 pos : POSITION;\ float4 col : COLOR0;\ float2 uv : TEXCOORD0;\ };\ \ struct PS_INPUT\ {\ float4 pos : SV_POSITION;\ float4 col : COLOR0;\ float2 uv : TEXCOORD0;\ };\ \ PS_INPUT main(VS_INPUT input)\ {\ PS_INPUT output;\ output.pos = mul( ProjectionMatrix, float4(input.pos.xy, 0.f, 1.f));\ output.col = input.col;\ output.uv = input.uv;\ return output;\ }"; if (FAILED(D3DCompile(vertexShader, strlen(vertexShader), nullptr, nullptr, nullptr, "main", "vs_5_0", 0, 0, &vertexShaderBlob, nullptr))) return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob! psoDesc.VS = { vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize() }; // Create the input layout static D3D12_INPUT_ELEMENT_DESC local_layout[] = { { "POSITION", 0, DXGI_FORMAT_R32G32_FLOAT, 0, (UINT)IM_OFFSETOF(ImDrawVert, pos), D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA, 0 }, { "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, (UINT)IM_OFFSETOF(ImDrawVert, uv), D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA, 0 }, { "COLOR", 0, DXGI_FORMAT_R8G8B8A8_UNORM, 0, (UINT)IM_OFFSETOF(ImDrawVert, col), D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA, 0 }, }; psoDesc.InputLayout = { local_layout, 3 }; } // Create the pixel shader { static const char* pixelShader = "struct PS_INPUT\ {\ float4 pos : SV_POSITION;\ float4 col : COLOR0;\ float2 uv : TEXCOORD0;\ };\ SamplerState sampler0 : register(s0);\ Texture2D texture0 : register(t0);\ \ float4 main(PS_INPUT input) : SV_Target\ {\ float4 out_col = input.col * texture0.Sample(sampler0, input.uv); \ return out_col; \ }"; if (FAILED(D3DCompile(pixelShader, strlen(pixelShader), nullptr, nullptr, nullptr, "main", "ps_5_0", 0, 0, &pixelShaderBlob, nullptr))) { vertexShaderBlob->Release(); return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob! } psoDesc.PS = { pixelShaderBlob->GetBufferPointer(), pixelShaderBlob->GetBufferSize() }; } // Create the blending setup { D3D12_BLEND_DESC& desc = psoDesc.BlendState; desc.AlphaToCoverageEnable = false; desc.RenderTarget[0].BlendEnable = true; desc.RenderTarget[0].SrcBlend = D3D12_BLEND_SRC_ALPHA; desc.RenderTarget[0].DestBlend = D3D12_BLEND_INV_SRC_ALPHA; desc.RenderTarget[0].BlendOp = D3D12_BLEND_OP_ADD; desc.RenderTarget[0].SrcBlendAlpha = D3D12_BLEND_ONE; desc.RenderTarget[0].DestBlendAlpha = D3D12_BLEND_INV_SRC_ALPHA; desc.RenderTarget[0].BlendOpAlpha = D3D12_BLEND_OP_ADD; desc.RenderTarget[0].RenderTargetWriteMask = D3D12_COLOR_WRITE_ENABLE_ALL; } // Create the rasterizer state { D3D12_RASTERIZER_DESC& desc = psoDesc.RasterizerState; desc.FillMode = D3D12_FILL_MODE_SOLID; desc.CullMode = D3D12_CULL_MODE_NONE; desc.FrontCounterClockwise = FALSE; desc.DepthBias = D3D12_DEFAULT_DEPTH_BIAS; desc.DepthBiasClamp = D3D12_DEFAULT_DEPTH_BIAS_CLAMP; desc.SlopeScaledDepthBias = D3D12_DEFAULT_SLOPE_SCALED_DEPTH_BIAS; desc.DepthClipEnable = true; desc.MultisampleEnable = FALSE; desc.AntialiasedLineEnable = FALSE; desc.ForcedSampleCount = 0; desc.ConservativeRaster = D3D12_CONSERVATIVE_RASTERIZATION_MODE_OFF; } // Create depth-stencil State { D3D12_DEPTH_STENCIL_DESC& desc = psoDesc.DepthStencilState; desc.DepthEnable = false; desc.DepthWriteMask = D3D12_DEPTH_WRITE_MASK_ALL; desc.DepthFunc = D3D12_COMPARISON_FUNC_ALWAYS; desc.StencilEnable = false; desc.FrontFace.StencilFailOp = desc.FrontFace.StencilDepthFailOp = desc.FrontFace.StencilPassOp = D3D12_STENCIL_OP_KEEP; desc.FrontFace.StencilFunc = D3D12_COMPARISON_FUNC_ALWAYS; desc.BackFace = desc.FrontFace; } HRESULT result_pipeline_state = bd->pd3dDevice->CreateGraphicsPipelineState(&psoDesc, IID_PPV_ARGS(&bd->pPipelineState)); vertexShaderBlob->Release(); pixelShaderBlob->Release(); if (result_pipeline_state != S_OK) return false; ImGui_ImplDX12_CreateFontsTexture(); return true; } static void ImGui_ImplDX12_DestroyRenderBuffers(ImGui_ImplDX12_RenderBuffers* render_buffers) { SafeRelease(render_buffers->IndexBuffer); SafeRelease(render_buffers->VertexBuffer); render_buffers->IndexBufferSize = render_buffers->VertexBufferSize = 0; } void ImGui_ImplDX12_InvalidateDeviceObjects() { ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); if (!bd || !bd->pd3dDevice) return; ImGuiIO& io = ImGui::GetIO(); SafeRelease(bd->pRootSignature); SafeRelease(bd->pPipelineState); SafeRelease(bd->pFontTextureResource); io.Fonts->SetTexID(0); // We copied bd->pFontTextureView to io.Fonts->TexID so let's clear that as well. } bool ImGui_ImplDX12_Init(ID3D12Device* device, int num_frames_in_flight, DXGI_FORMAT rtv_format, ID3D12DescriptorHeap* cbv_srv_heap, D3D12_CPU_DESCRIPTOR_HANDLE font_srv_cpu_desc_handle, D3D12_GPU_DESCRIPTOR_HANDLE font_srv_gpu_desc_handle) { ImGuiIO& io = ImGui::GetIO(); IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!"); // Setup backend capabilities flags ImGui_ImplDX12_Data* bd = IM_NEW(ImGui_ImplDX12_Data)(); io.BackendRendererUserData = (void*)bd; io.BackendRendererName = "imgui_impl_dx12"; io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset; // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes. io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports; // We can create multi-viewports on the Renderer side (optional) if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) ImGui_ImplDX12_InitPlatformInterface(); bd->pd3dDevice = device; bd->RTVFormat = rtv_format; bd->hFontSrvCpuDescHandle = font_srv_cpu_desc_handle; bd->hFontSrvGpuDescHandle = font_srv_gpu_desc_handle; bd->numFramesInFlight = num_frames_in_flight; bd->pd3dSrvDescHeap = cbv_srv_heap; // Create a dummy ImGui_ImplDX12_ViewportData holder for the main viewport, // Since this is created and managed by the application, we will only use the ->Resources[] fields. ImGuiViewport* main_viewport = ImGui::GetMainViewport(); main_viewport->RendererUserData = IM_NEW(ImGui_ImplDX12_ViewportData)(bd->numFramesInFlight); return true; } void ImGui_ImplDX12_Shutdown() { ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?"); ImGuiIO& io = ImGui::GetIO(); // Manually delete main viewport render resources in-case we haven't initialized for viewports ImGuiViewport* main_viewport = ImGui::GetMainViewport(); if (ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)main_viewport->RendererUserData) { // We could just call ImGui_ImplDX12_DestroyWindow(main_viewport) as a convenience but that would be misleading since we only use data->Resources[] for (UINT i = 0; i < bd->numFramesInFlight; i++) ImGui_ImplDX12_DestroyRenderBuffers(&vd->FrameRenderBuffers[i]); IM_DELETE(vd); main_viewport->RendererUserData = nullptr; } // Clean up windows and device objects ImGui_ImplDX12_ShutdownPlatformInterface(); ImGui_ImplDX12_InvalidateDeviceObjects(); io.BackendRendererName = nullptr; io.BackendRendererUserData = nullptr; io.BackendFlags &= ~ImGuiBackendFlags_RendererHasVtxOffset; IM_DELETE(bd); } void ImGui_ImplDX12_NewFrame() { ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplDX12_Init()?"); if (!bd->pPipelineState) ImGui_ImplDX12_CreateDeviceObjects(); } //-------------------------------------------------------------------------------------------------------- // MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT // This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously. // If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first.. //-------------------------------------------------------------------------------------------------------- static void ImGui_ImplDX12_CreateWindow(ImGuiViewport* viewport) { ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); ImGui_ImplDX12_ViewportData* vd = IM_NEW(ImGui_ImplDX12_ViewportData)(bd->numFramesInFlight); viewport->RendererUserData = vd; // PlatformHandleRaw should always be a HWND, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL_Window*). // Some backends will leave PlatformHandleRaw == 0, in which case we assume PlatformHandle will contain the HWND. HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle; IM_ASSERT(hwnd != 0); vd->FrameIndex = UINT_MAX; // Create command queue. D3D12_COMMAND_QUEUE_DESC queue_desc = {}; queue_desc.Flags = D3D12_COMMAND_QUEUE_FLAG_NONE; queue_desc.Type = D3D12_COMMAND_LIST_TYPE_DIRECT; HRESULT res = S_OK; res = bd->pd3dDevice->CreateCommandQueue(&queue_desc, IID_PPV_ARGS(&vd->CommandQueue)); IM_ASSERT(res == S_OK); // Create command allocator. for (UINT i = 0; i < bd->numFramesInFlight; ++i) { res = bd->pd3dDevice->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT, IID_PPV_ARGS(&vd->FrameCtx[i].CommandAllocator)); IM_ASSERT(res == S_OK); } // Create command list. res = bd->pd3dDevice->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, vd->FrameCtx[0].CommandAllocator, nullptr, IID_PPV_ARGS(&vd->CommandList)); IM_ASSERT(res == S_OK); vd->CommandList->Close(); // Create fence. res = bd->pd3dDevice->CreateFence(0, D3D12_FENCE_FLAG_NONE, IID_PPV_ARGS(&vd->Fence)); IM_ASSERT(res == S_OK); vd->FenceEvent = CreateEvent(nullptr, FALSE, FALSE, nullptr); IM_ASSERT(vd->FenceEvent != nullptr); // Create swap chain // FIXME-VIEWPORT: May want to copy/inherit swap chain settings from the user/application. DXGI_SWAP_CHAIN_DESC1 sd1; ZeroMemory(&sd1, sizeof(sd1)); sd1.BufferCount = bd->numFramesInFlight; sd1.Width = (UINT)viewport->Size.x; sd1.Height = (UINT)viewport->Size.y; sd1.Format = bd->RTVFormat; sd1.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT; sd1.SampleDesc.Count = 1; sd1.SampleDesc.Quality = 0; sd1.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD; sd1.AlphaMode = DXGI_ALPHA_MODE_UNSPECIFIED; sd1.Scaling = DXGI_SCALING_STRETCH; sd1.Stereo = FALSE; IDXGIFactory4* dxgi_factory = nullptr; res = ::CreateDXGIFactory1(IID_PPV_ARGS(&dxgi_factory)); IM_ASSERT(res == S_OK); IDXGISwapChain1* swap_chain = nullptr; res = dxgi_factory->CreateSwapChainForHwnd(vd->CommandQueue, hwnd, &sd1, nullptr, nullptr, &swap_chain); IM_ASSERT(res == S_OK); dxgi_factory->Release(); // Or swapChain.As(&mSwapChain) IM_ASSERT(vd->SwapChain == nullptr); swap_chain->QueryInterface(IID_PPV_ARGS(&vd->SwapChain)); swap_chain->Release(); // Create the render targets if (vd->SwapChain) { D3D12_DESCRIPTOR_HEAP_DESC desc = {}; desc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_RTV; desc.NumDescriptors = bd->numFramesInFlight; desc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_NONE; desc.NodeMask = 1; HRESULT hr = bd->pd3dDevice->CreateDescriptorHeap(&desc, IID_PPV_ARGS(&vd->RtvDescHeap)); IM_ASSERT(hr == S_OK); SIZE_T rtv_descriptor_size = bd->pd3dDevice->GetDescriptorHandleIncrementSize(D3D12_DESCRIPTOR_HEAP_TYPE_RTV); D3D12_CPU_DESCRIPTOR_HANDLE rtv_handle = vd->RtvDescHeap->GetCPUDescriptorHandleForHeapStart(); for (UINT i = 0; i < bd->numFramesInFlight; i++) { vd->FrameCtx[i].RenderTargetCpuDescriptors = rtv_handle; rtv_handle.ptr += rtv_descriptor_size; } ID3D12Resource* back_buffer; for (UINT i = 0; i < bd->numFramesInFlight; i++) { IM_ASSERT(vd->FrameCtx[i].RenderTarget == nullptr); vd->SwapChain->GetBuffer(i, IID_PPV_ARGS(&back_buffer)); bd->pd3dDevice->CreateRenderTargetView(back_buffer, nullptr, vd->FrameCtx[i].RenderTargetCpuDescriptors); vd->FrameCtx[i].RenderTarget = back_buffer; } } for (UINT i = 0; i < bd->numFramesInFlight; i++) ImGui_ImplDX12_DestroyRenderBuffers(&vd->FrameRenderBuffers[i]); } static void ImGui_WaitForPendingOperations(ImGui_ImplDX12_ViewportData* vd) { HRESULT hr = S_FALSE; if (vd && vd->CommandQueue && vd->Fence && vd->FenceEvent) { hr = vd->CommandQueue->Signal(vd->Fence, ++vd->FenceSignaledValue); IM_ASSERT(hr == S_OK); ::WaitForSingleObject(vd->FenceEvent, 0); // Reset any forgotten waits hr = vd->Fence->SetEventOnCompletion(vd->FenceSignaledValue, vd->FenceEvent); IM_ASSERT(hr == S_OK); ::WaitForSingleObject(vd->FenceEvent, INFINITE); } } static void ImGui_ImplDX12_DestroyWindow(ImGuiViewport* viewport) { // The main viewport (owned by the application) will always have RendererUserData == 0 since we didn't create the data for it. ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); if (ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)viewport->RendererUserData) { ImGui_WaitForPendingOperations(vd); SafeRelease(vd->CommandQueue); SafeRelease(vd->CommandList); SafeRelease(vd->SwapChain); SafeRelease(vd->RtvDescHeap); SafeRelease(vd->Fence); ::CloseHandle(vd->FenceEvent); vd->FenceEvent = nullptr; for (UINT i = 0; i < bd->numFramesInFlight; i++) { SafeRelease(vd->FrameCtx[i].RenderTarget); SafeRelease(vd->FrameCtx[i].CommandAllocator); ImGui_ImplDX12_DestroyRenderBuffers(&vd->FrameRenderBuffers[i]); } IM_DELETE(vd); } viewport->RendererUserData = nullptr; } static void ImGui_ImplDX12_SetWindowSize(ImGuiViewport* viewport, ImVec2 size) { ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)viewport->RendererUserData; ImGui_WaitForPendingOperations(vd); for (UINT i = 0; i < bd->numFramesInFlight; i++) SafeRelease(vd->FrameCtx[i].RenderTarget); if (vd->SwapChain) { ID3D12Resource* back_buffer = nullptr; vd->SwapChain->ResizeBuffers(0, (UINT)size.x, (UINT)size.y, DXGI_FORMAT_UNKNOWN, 0); for (UINT i = 0; i < bd->numFramesInFlight; i++) { vd->SwapChain->GetBuffer(i, IID_PPV_ARGS(&back_buffer)); bd->pd3dDevice->CreateRenderTargetView(back_buffer, nullptr, vd->FrameCtx[i].RenderTargetCpuDescriptors); vd->FrameCtx[i].RenderTarget = back_buffer; } } } static void ImGui_ImplDX12_RenderWindow(ImGuiViewport* viewport, void*) { ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData(); ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)viewport->RendererUserData; ImGui_ImplDX12_FrameContext* frame_context = &vd->FrameCtx[vd->FrameIndex % bd->numFramesInFlight]; UINT back_buffer_idx = vd->SwapChain->GetCurrentBackBufferIndex(); const ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f); D3D12_RESOURCE_BARRIER barrier = {}; barrier.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION; barrier.Flags = D3D12_RESOURCE_BARRIER_FLAG_NONE; barrier.Transition.pResource = vd->FrameCtx[back_buffer_idx].RenderTarget; barrier.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES; barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_PRESENT; barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_RENDER_TARGET; // Draw ID3D12GraphicsCommandList* cmd_list = vd->CommandList; frame_context->CommandAllocator->Reset(); cmd_list->Reset(frame_context->CommandAllocator, nullptr); cmd_list->ResourceBarrier(1, &barrier); cmd_list->OMSetRenderTargets(1, &vd->FrameCtx[back_buffer_idx].RenderTargetCpuDescriptors, FALSE, nullptr); if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear)) cmd_list->ClearRenderTargetView(vd->FrameCtx[back_buffer_idx].RenderTargetCpuDescriptors, (float*)&clear_color, 0, nullptr); cmd_list->SetDescriptorHeaps(1, &bd->pd3dSrvDescHeap); ImGui_ImplDX12_RenderDrawData(viewport->DrawData, cmd_list); barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_RENDER_TARGET; barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_PRESENT; cmd_list->ResourceBarrier(1, &barrier); cmd_list->Close(); vd->CommandQueue->Wait(vd->Fence, vd->FenceSignaledValue); vd->CommandQueue->ExecuteCommandLists(1, (ID3D12CommandList* const*)&cmd_list); vd->CommandQueue->Signal(vd->Fence, ++vd->FenceSignaledValue); } static void ImGui_ImplDX12_SwapBuffers(ImGuiViewport* viewport, void*) { ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)viewport->RendererUserData; vd->SwapChain->Present(0, 0); while (vd->Fence->GetCompletedValue() < vd->FenceSignaledValue) ::SwitchToThread(); } void ImGui_ImplDX12_InitPlatformInterface() { ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO(); platform_io.Renderer_CreateWindow = ImGui_ImplDX12_CreateWindow; platform_io.Renderer_DestroyWindow = ImGui_ImplDX12_DestroyWindow; platform_io.Renderer_SetWindowSize = ImGui_ImplDX12_SetWindowSize; platform_io.Renderer_RenderWindow = ImGui_ImplDX12_RenderWindow; platform_io.Renderer_SwapBuffers = ImGui_ImplDX12_SwapBuffers; } void ImGui_ImplDX12_ShutdownPlatformInterface() { ImGui::DestroyPlatformWindows(); }