// dear imgui: Renderer Backend for DirectX11 // This needs to be used along with a Platform Backend (e.g. Win32) // Implemented features: // [X] Renderer: User texture binding. Use 'ID3D11ShaderResourceView*' 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'. // 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: DirectX11: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement) // 2021-02-18: DirectX11: Change blending equation to preserve alpha in output buffer. // 2019-08-01: DirectX11: Fixed code querying the Geometry Shader state (would generally error with Debug layer enabled). // 2019-07-21: DirectX11: Backup, clear and restore Geometry Shader is any is bound when calling ImGui_ImplDX10_RenderDrawData. Clearing Hull/Domain/Compute shaders without backup/restore. // 2019-05-29: DirectX11: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag. // 2019-04-30: DirectX11: Added support for special ImDrawCallback_ResetRenderState callback to reset render state. // 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. // 2018-08-01: DirectX11: Querying for IDXGIFactory instead of IDXGIFactory1 to increase compatibility. // 2018-07-13: DirectX11: Fixed unreleased resources in Init and Shutdown functions. // 2018-06-08: Misc: Extracted imgui_impl_dx11.cpp/.h away from the old combined DX11+Win32 example. // 2018-06-08: DirectX11: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle. // 2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX11_RenderDrawData() in the .h file so you can call it yourself. // 2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves. // 2016-05-07: DirectX11: Disabling depth-write. #include "imgui.h" #include "imgui_impl_dx11.h" // DirectX #include #include #include #ifdef _MSC_VER #pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below. #endif // DirectX11 data struct ImGui_ImplDX11_Data { ID3D11Device* pd3dDevice; ID3D11DeviceContext* pd3dDeviceContext; IDXGIFactory* pFactory; ID3D11Buffer* pVB; ID3D11Buffer* pIB; ID3D11VertexShader* pVertexShader; ID3D11InputLayout* pInputLayout; ID3D11Buffer* pVertexConstantBuffer; ID3D11PixelShader* pPixelShader; ID3D11SamplerState* pFontSampler; ID3D11ShaderResourceView* pFontTextureView; ID3D11RasterizerState* pRasterizerState; ID3D11BlendState* pBlendState; ID3D11DepthStencilState* pDepthStencilState; int VertexBufferSize; int IndexBufferSize; ImGui_ImplDX11_Data() { memset((void*)this, 0, sizeof(*this)); VertexBufferSize = 5000; IndexBufferSize = 10000; } }; struct VERTEX_CONSTANT_BUFFER_DX11 { float mvp[4][4]; }; // 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_ImplDX11_Data* ImGui_ImplDX11_GetBackendData() { return ImGui::GetCurrentContext() ? (ImGui_ImplDX11_Data*)ImGui::GetIO().BackendRendererUserData : nullptr; } // Forward Declarations static void ImGui_ImplDX11_InitPlatformInterface(); static void ImGui_ImplDX11_ShutdownPlatformInterface(); // Functions static void ImGui_ImplDX11_SetupRenderState(ImDrawData* draw_data, ID3D11DeviceContext* ctx) { ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); // Setup viewport D3D11_VIEWPORT vp; memset(&vp, 0, sizeof(D3D11_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; ctx->RSSetViewports(1, &vp); // Setup shader and vertex buffers unsigned int stride = sizeof(ImDrawVert); unsigned int offset = 0; ctx->IASetInputLayout(bd->pInputLayout); ctx->IASetVertexBuffers(0, 1, &bd->pVB, &stride, &offset); ctx->IASetIndexBuffer(bd->pIB, sizeof(ImDrawIdx) == 2 ? DXGI_FORMAT_R16_UINT : DXGI_FORMAT_R32_UINT, 0); ctx->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST); ctx->VSSetShader(bd->pVertexShader, nullptr, 0); ctx->VSSetConstantBuffers(0, 1, &bd->pVertexConstantBuffer); ctx->PSSetShader(bd->pPixelShader, nullptr, 0); ctx->PSSetSamplers(0, 1, &bd->pFontSampler); ctx->GSSetShader(nullptr, nullptr, 0); ctx->HSSetShader(nullptr, nullptr, 0); // In theory we should backup and restore this as well.. very infrequently used.. ctx->DSSetShader(nullptr, nullptr, 0); // In theory we should backup and restore this as well.. very infrequently used.. ctx->CSSetShader(nullptr, nullptr, 0); // In theory we should backup and restore this as well.. very infrequently used.. // Setup blend state const float blend_factor[4] = { 0.f, 0.f, 0.f, 0.f }; ctx->OMSetBlendState(bd->pBlendState, blend_factor, 0xffffffff); ctx->OMSetDepthStencilState(bd->pDepthStencilState, 0); ctx->RSSetState(bd->pRasterizerState); } // Render function void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data) { // Avoid rendering when minimized if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f) return; ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); ID3D11DeviceContext* ctx = bd->pd3dDeviceContext; // Create and grow vertex/index buffers if needed if (!bd->pVB || bd->VertexBufferSize < draw_data->TotalVtxCount) { if (bd->pVB) { bd->pVB->Release(); bd->pVB = nullptr; } bd->VertexBufferSize = draw_data->TotalVtxCount + 5000; D3D11_BUFFER_DESC desc; memset(&desc, 0, sizeof(D3D11_BUFFER_DESC)); desc.Usage = D3D11_USAGE_DYNAMIC; desc.ByteWidth = bd->VertexBufferSize * sizeof(ImDrawVert); desc.BindFlags = D3D11_BIND_VERTEX_BUFFER; desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE; desc.MiscFlags = 0; if (bd->pd3dDevice->CreateBuffer(&desc, nullptr, &bd->pVB) < 0) return; } if (!bd->pIB || bd->IndexBufferSize < draw_data->TotalIdxCount) { if (bd->pIB) { bd->pIB->Release(); bd->pIB = nullptr; } bd->IndexBufferSize = draw_data->TotalIdxCount + 10000; D3D11_BUFFER_DESC desc; memset(&desc, 0, sizeof(D3D11_BUFFER_DESC)); desc.Usage = D3D11_USAGE_DYNAMIC; desc.ByteWidth = bd->IndexBufferSize * sizeof(ImDrawIdx); desc.BindFlags = D3D11_BIND_INDEX_BUFFER; desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE; if (bd->pd3dDevice->CreateBuffer(&desc, nullptr, &bd->pIB) < 0) return; } // Upload vertex/index data into a single contiguous GPU buffer D3D11_MAPPED_SUBRESOURCE vtx_resource, idx_resource; if (ctx->Map(bd->pVB, 0, D3D11_MAP_WRITE_DISCARD, 0, &vtx_resource) != S_OK) return; if (ctx->Map(bd->pIB, 0, D3D11_MAP_WRITE_DISCARD, 0, &idx_resource) != S_OK) return; ImDrawVert* vtx_dst = (ImDrawVert*)vtx_resource.pData; ImDrawIdx* idx_dst = (ImDrawIdx*)idx_resource.pData; 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; } ctx->Unmap(bd->pVB, 0); ctx->Unmap(bd->pIB, 0); // 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). DisplayPos is (0,0) for single viewport apps. { D3D11_MAPPED_SUBRESOURCE mapped_resource; if (ctx->Map(bd->pVertexConstantBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mapped_resource) != S_OK) return; VERTEX_CONSTANT_BUFFER_DX11* constant_buffer = (VERTEX_CONSTANT_BUFFER_DX11*)mapped_resource.pData; 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(&constant_buffer->mvp, mvp, sizeof(mvp)); ctx->Unmap(bd->pVertexConstantBuffer, 0); } // Backup DX state that will be modified to restore it afterwards (unfortunately this is very ugly looking and verbose. Close your eyes!) struct BACKUP_DX11_STATE { UINT ScissorRectsCount, ViewportsCount; D3D11_RECT ScissorRects[D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE]; D3D11_VIEWPORT Viewports[D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE]; ID3D11RasterizerState* RS; ID3D11BlendState* BlendState; FLOAT BlendFactor[4]; UINT SampleMask; UINT StencilRef; ID3D11DepthStencilState* DepthStencilState; ID3D11ShaderResourceView* PSShaderResource; ID3D11SamplerState* PSSampler; ID3D11PixelShader* PS; ID3D11VertexShader* VS; ID3D11GeometryShader* GS; UINT PSInstancesCount, VSInstancesCount, GSInstancesCount; ID3D11ClassInstance *PSInstances[256], *VSInstances[256], *GSInstances[256]; // 256 is max according to PSSetShader documentation D3D11_PRIMITIVE_TOPOLOGY PrimitiveTopology; ID3D11Buffer* IndexBuffer, *VertexBuffer, *VSConstantBuffer; UINT IndexBufferOffset, VertexBufferStride, VertexBufferOffset; DXGI_FORMAT IndexBufferFormat; ID3D11InputLayout* InputLayout; }; BACKUP_DX11_STATE old = {}; old.ScissorRectsCount = old.ViewportsCount = D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE; ctx->RSGetScissorRects(&old.ScissorRectsCount, old.ScissorRects); ctx->RSGetViewports(&old.ViewportsCount, old.Viewports); ctx->RSGetState(&old.RS); ctx->OMGetBlendState(&old.BlendState, old.BlendFactor, &old.SampleMask); ctx->OMGetDepthStencilState(&old.DepthStencilState, &old.StencilRef); ctx->PSGetShaderResources(0, 1, &old.PSShaderResource); ctx->PSGetSamplers(0, 1, &old.PSSampler); old.PSInstancesCount = old.VSInstancesCount = old.GSInstancesCount = 256; ctx->PSGetShader(&old.PS, old.PSInstances, &old.PSInstancesCount); ctx->VSGetShader(&old.VS, old.VSInstances, &old.VSInstancesCount); ctx->VSGetConstantBuffers(0, 1, &old.VSConstantBuffer); ctx->GSGetShader(&old.GS, old.GSInstances, &old.GSInstancesCount); ctx->IAGetPrimitiveTopology(&old.PrimitiveTopology); ctx->IAGetIndexBuffer(&old.IndexBuffer, &old.IndexBufferFormat, &old.IndexBufferOffset); ctx->IAGetVertexBuffers(0, 1, &old.VertexBuffer, &old.VertexBufferStride, &old.VertexBufferOffset); ctx->IAGetInputLayout(&old.InputLayout); // Setup desired DX state ImGui_ImplDX11_SetupRenderState(draw_data, ctx); // Render command lists // (Because we merged all buffers into a single one, we maintain our own offset into them) int global_idx_offset = 0; int global_vtx_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_ImplDX11_SetupRenderState(draw_data, ctx); 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 const D3D11_RECT r = { (LONG)clip_min.x, (LONG)clip_min.y, (LONG)clip_max.x, (LONG)clip_max.y }; ctx->RSSetScissorRects(1, &r); // Bind texture, Draw ID3D11ShaderResourceView* texture_srv = (ID3D11ShaderResourceView*)pcmd->GetTexID(); ctx->PSSetShaderResources(0, 1, &texture_srv); ctx->DrawIndexed(pcmd->ElemCount, pcmd->IdxOffset + global_idx_offset, pcmd->VtxOffset + global_vtx_offset); } } global_idx_offset += cmd_list->IdxBuffer.Size; global_vtx_offset += cmd_list->VtxBuffer.Size; } // Restore modified DX state ctx->RSSetScissorRects(old.ScissorRectsCount, old.ScissorRects); ctx->RSSetViewports(old.ViewportsCount, old.Viewports); ctx->RSSetState(old.RS); if (old.RS) old.RS->Release(); ctx->OMSetBlendState(old.BlendState, old.BlendFactor, old.SampleMask); if (old.BlendState) old.BlendState->Release(); ctx->OMSetDepthStencilState(old.DepthStencilState, old.StencilRef); if (old.DepthStencilState) old.DepthStencilState->Release(); ctx->PSSetShaderResources(0, 1, &old.PSShaderResource); if (old.PSShaderResource) old.PSShaderResource->Release(); ctx->PSSetSamplers(0, 1, &old.PSSampler); if (old.PSSampler) old.PSSampler->Release(); ctx->PSSetShader(old.PS, old.PSInstances, old.PSInstancesCount); if (old.PS) old.PS->Release(); for (UINT i = 0; i < old.PSInstancesCount; i++) if (old.PSInstances[i]) old.PSInstances[i]->Release(); ctx->VSSetShader(old.VS, old.VSInstances, old.VSInstancesCount); if (old.VS) old.VS->Release(); ctx->VSSetConstantBuffers(0, 1, &old.VSConstantBuffer); if (old.VSConstantBuffer) old.VSConstantBuffer->Release(); ctx->GSSetShader(old.GS, old.GSInstances, old.GSInstancesCount); if (old.GS) old.GS->Release(); for (UINT i = 0; i < old.VSInstancesCount; i++) if (old.VSInstances[i]) old.VSInstances[i]->Release(); ctx->IASetPrimitiveTopology(old.PrimitiveTopology); ctx->IASetIndexBuffer(old.IndexBuffer, old.IndexBufferFormat, old.IndexBufferOffset); if (old.IndexBuffer) old.IndexBuffer->Release(); ctx->IASetVertexBuffers(0, 1, &old.VertexBuffer, &old.VertexBufferStride, &old.VertexBufferOffset); if (old.VertexBuffer) old.VertexBuffer->Release(); ctx->IASetInputLayout(old.InputLayout); if (old.InputLayout) old.InputLayout->Release(); } static void ImGui_ImplDX11_CreateFontsTexture() { // Build texture atlas ImGuiIO& io = ImGui::GetIO(); ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); unsigned char* pixels; int width, height; io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Upload texture to graphics system { D3D11_TEXTURE2D_DESC desc; ZeroMemory(&desc, sizeof(desc)); desc.Width = width; desc.Height = height; desc.MipLevels = 1; desc.ArraySize = 1; desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM; desc.SampleDesc.Count = 1; desc.Usage = D3D11_USAGE_DEFAULT; desc.BindFlags = D3D11_BIND_SHADER_RESOURCE; desc.CPUAccessFlags = 0; ID3D11Texture2D* pTexture = nullptr; D3D11_SUBRESOURCE_DATA subResource; subResource.pSysMem = pixels; subResource.SysMemPitch = desc.Width * 4; subResource.SysMemSlicePitch = 0; bd->pd3dDevice->CreateTexture2D(&desc, &subResource, &pTexture); IM_ASSERT(pTexture != nullptr); // Create texture view D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc; ZeroMemory(&srvDesc, sizeof(srvDesc)); srvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM; srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D; srvDesc.Texture2D.MipLevels = desc.MipLevels; srvDesc.Texture2D.MostDetailedMip = 0; bd->pd3dDevice->CreateShaderResourceView(pTexture, &srvDesc, &bd->pFontTextureView); pTexture->Release(); } // Store our identifier io.Fonts->SetTexID((ImTextureID)bd->pFontTextureView); // Create texture sampler // (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling) { D3D11_SAMPLER_DESC desc; ZeroMemory(&desc, sizeof(desc)); desc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR; desc.AddressU = D3D11_TEXTURE_ADDRESS_WRAP; desc.AddressV = D3D11_TEXTURE_ADDRESS_WRAP; desc.AddressW = D3D11_TEXTURE_ADDRESS_WRAP; desc.MipLODBias = 0.f; desc.ComparisonFunc = D3D11_COMPARISON_ALWAYS; desc.MinLOD = 0.f; desc.MaxLOD = 0.f; bd->pd3dDevice->CreateSamplerState(&desc, &bd->pFontSampler); } } bool ImGui_ImplDX11_CreateDeviceObjects() { ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); if (!bd->pd3dDevice) return false; if (bd->pFontSampler) ImGui_ImplDX11_InvalidateDeviceObjects(); // 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 DX11 sample code but remove this dependency you can: // 1) compile once, save the compiled shader blobs into a file or source code and pass them to CreateVertexShader()/CreatePixelShader() [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. // 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;\ }"; ID3DBlob* vertexShaderBlob; if (FAILED(D3DCompile(vertexShader, strlen(vertexShader), nullptr, nullptr, nullptr, "main", "vs_4_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! if (bd->pd3dDevice->CreateVertexShader(vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize(), nullptr, &bd->pVertexShader) != S_OK) { vertexShaderBlob->Release(); return false; } // Create the input layout D3D11_INPUT_ELEMENT_DESC local_layout[] = { { "POSITION", 0, DXGI_FORMAT_R32G32_FLOAT, 0, (UINT)IM_OFFSETOF(ImDrawVert, pos), D3D11_INPUT_PER_VERTEX_DATA, 0 }, { "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, (UINT)IM_OFFSETOF(ImDrawVert, uv), D3D11_INPUT_PER_VERTEX_DATA, 0 }, { "COLOR", 0, DXGI_FORMAT_R8G8B8A8_UNORM, 0, (UINT)IM_OFFSETOF(ImDrawVert, col), D3D11_INPUT_PER_VERTEX_DATA, 0 }, }; if (bd->pd3dDevice->CreateInputLayout(local_layout, 3, vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize(), &bd->pInputLayout) != S_OK) { vertexShaderBlob->Release(); return false; } vertexShaderBlob->Release(); // Create the constant buffer { D3D11_BUFFER_DESC desc; desc.ByteWidth = sizeof(VERTEX_CONSTANT_BUFFER_DX11); desc.Usage = D3D11_USAGE_DYNAMIC; desc.BindFlags = D3D11_BIND_CONSTANT_BUFFER; desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE; desc.MiscFlags = 0; bd->pd3dDevice->CreateBuffer(&desc, nullptr, &bd->pVertexConstantBuffer); } } // Create the pixel shader { static const char* pixelShader = "struct PS_INPUT\ {\ float4 pos : SV_POSITION;\ float4 col : COLOR0;\ float2 uv : TEXCOORD0;\ };\ sampler sampler0;\ Texture2D texture0;\ \ float4 main(PS_INPUT input) : SV_Target\ {\ float4 out_col = input.col * texture0.Sample(sampler0, input.uv); \ return out_col; \ }"; ID3DBlob* pixelShaderBlob; if (FAILED(D3DCompile(pixelShader, strlen(pixelShader), nullptr, nullptr, nullptr, "main", "ps_4_0", 0, 0, &pixelShaderBlob, nullptr))) return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob! if (bd->pd3dDevice->CreatePixelShader(pixelShaderBlob->GetBufferPointer(), pixelShaderBlob->GetBufferSize(), nullptr, &bd->pPixelShader) != S_OK) { pixelShaderBlob->Release(); return false; } pixelShaderBlob->Release(); } // Create the blending setup { D3D11_BLEND_DESC desc; ZeroMemory(&desc, sizeof(desc)); desc.AlphaToCoverageEnable = false; desc.RenderTarget[0].BlendEnable = true; desc.RenderTarget[0].SrcBlend = D3D11_BLEND_SRC_ALPHA; desc.RenderTarget[0].DestBlend = D3D11_BLEND_INV_SRC_ALPHA; desc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD; desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ONE; desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_INV_SRC_ALPHA; desc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD; desc.RenderTarget[0].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL; bd->pd3dDevice->CreateBlendState(&desc, &bd->pBlendState); } // Create the rasterizer state { D3D11_RASTERIZER_DESC desc; ZeroMemory(&desc, sizeof(desc)); desc.FillMode = D3D11_FILL_SOLID; desc.CullMode = D3D11_CULL_NONE; desc.ScissorEnable = true; desc.DepthClipEnable = true; bd->pd3dDevice->CreateRasterizerState(&desc, &bd->pRasterizerState); } // Create depth-stencil State { D3D11_DEPTH_STENCIL_DESC desc; ZeroMemory(&desc, sizeof(desc)); desc.DepthEnable = false; desc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL; desc.DepthFunc = D3D11_COMPARISON_ALWAYS; desc.StencilEnable = false; desc.FrontFace.StencilFailOp = desc.FrontFace.StencilDepthFailOp = desc.FrontFace.StencilPassOp = D3D11_STENCIL_OP_KEEP; desc.FrontFace.StencilFunc = D3D11_COMPARISON_ALWAYS; desc.BackFace = desc.FrontFace; bd->pd3dDevice->CreateDepthStencilState(&desc, &bd->pDepthStencilState); } ImGui_ImplDX11_CreateFontsTexture(); return true; } void ImGui_ImplDX11_InvalidateDeviceObjects() { ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); if (!bd->pd3dDevice) return; if (bd->pFontSampler) { bd->pFontSampler->Release(); bd->pFontSampler = nullptr; } if (bd->pFontTextureView) { bd->pFontTextureView->Release(); bd->pFontTextureView = nullptr; ImGui::GetIO().Fonts->SetTexID(0); } // We copied data->pFontTextureView to io.Fonts->TexID so let's clear that as well. if (bd->pIB) { bd->pIB->Release(); bd->pIB = nullptr; } if (bd->pVB) { bd->pVB->Release(); bd->pVB = nullptr; } if (bd->pBlendState) { bd->pBlendState->Release(); bd->pBlendState = nullptr; } if (bd->pDepthStencilState) { bd->pDepthStencilState->Release(); bd->pDepthStencilState = nullptr; } if (bd->pRasterizerState) { bd->pRasterizerState->Release(); bd->pRasterizerState = nullptr; } if (bd->pPixelShader) { bd->pPixelShader->Release(); bd->pPixelShader = nullptr; } if (bd->pVertexConstantBuffer) { bd->pVertexConstantBuffer->Release(); bd->pVertexConstantBuffer = nullptr; } if (bd->pInputLayout) { bd->pInputLayout->Release(); bd->pInputLayout = nullptr; } if (bd->pVertexShader) { bd->pVertexShader->Release(); bd->pVertexShader = nullptr; } } bool ImGui_ImplDX11_Init(ID3D11Device* device, ID3D11DeviceContext* device_context) { ImGuiIO& io = ImGui::GetIO(); IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!"); // Setup backend capabilities flags ImGui_ImplDX11_Data* bd = IM_NEW(ImGui_ImplDX11_Data)(); io.BackendRendererUserData = (void*)bd; io.BackendRendererName = "imgui_impl_dx11"; 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) // Get factory from device IDXGIDevice* pDXGIDevice = nullptr; IDXGIAdapter* pDXGIAdapter = nullptr; IDXGIFactory* pFactory = nullptr; if (device->QueryInterface(IID_PPV_ARGS(&pDXGIDevice)) == S_OK) if (pDXGIDevice->GetParent(IID_PPV_ARGS(&pDXGIAdapter)) == S_OK) if (pDXGIAdapter->GetParent(IID_PPV_ARGS(&pFactory)) == S_OK) { bd->pd3dDevice = device; bd->pd3dDeviceContext = device_context; bd->pFactory = pFactory; } if (pDXGIDevice) pDXGIDevice->Release(); if (pDXGIAdapter) pDXGIAdapter->Release(); bd->pd3dDevice->AddRef(); bd->pd3dDeviceContext->AddRef(); if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) ImGui_ImplDX11_InitPlatformInterface(); return true; } void ImGui_ImplDX11_Shutdown() { ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?"); ImGuiIO& io = ImGui::GetIO(); ImGui_ImplDX11_ShutdownPlatformInterface(); ImGui_ImplDX11_InvalidateDeviceObjects(); if (bd->pFactory) { bd->pFactory->Release(); } if (bd->pd3dDevice) { bd->pd3dDevice->Release(); } if (bd->pd3dDeviceContext) { bd->pd3dDeviceContext->Release(); } io.BackendRendererName = nullptr; io.BackendRendererUserData = nullptr; io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasViewports); IM_DELETE(bd); } void ImGui_ImplDX11_NewFrame() { ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplDX11_Init()?"); if (!bd->pFontSampler) ImGui_ImplDX11_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.. //-------------------------------------------------------------------------------------------------------- // Helper structure we store in the void* RendererUserData field of each ImGuiViewport to easily retrieve our backend data. struct ImGui_ImplDX11_ViewportData { IDXGISwapChain* SwapChain; ID3D11RenderTargetView* RTView; ImGui_ImplDX11_ViewportData() { SwapChain = nullptr; RTView = nullptr; } ~ImGui_ImplDX11_ViewportData() { IM_ASSERT(SwapChain == nullptr && RTView == nullptr); } }; static void ImGui_ImplDX11_CreateWindow(ImGuiViewport* viewport) { ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); ImGui_ImplDX11_ViewportData* vd = IM_NEW(ImGui_ImplDX11_ViewportData)(); 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); // Create swap chain DXGI_SWAP_CHAIN_DESC sd; ZeroMemory(&sd, sizeof(sd)); sd.BufferDesc.Width = (UINT)viewport->Size.x; sd.BufferDesc.Height = (UINT)viewport->Size.y; sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM; sd.SampleDesc.Count = 1; sd.SampleDesc.Quality = 0; sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT; sd.BufferCount = 1; sd.OutputWindow = hwnd; sd.Windowed = TRUE; sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD; sd.Flags = 0; IM_ASSERT(vd->SwapChain == nullptr && vd->RTView == nullptr); bd->pFactory->CreateSwapChain(bd->pd3dDevice, &sd, &vd->SwapChain); // Create the render target if (vd->SwapChain) { ID3D11Texture2D* pBackBuffer; vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer)); bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &vd->RTView); pBackBuffer->Release(); } } static void ImGui_ImplDX11_DestroyWindow(ImGuiViewport* viewport) { // The main viewport (owned by the application) will always have RendererUserData == nullptr since we didn't create the data for it. if (ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData) { if (vd->SwapChain) vd->SwapChain->Release(); vd->SwapChain = nullptr; if (vd->RTView) vd->RTView->Release(); vd->RTView = nullptr; IM_DELETE(vd); } viewport->RendererUserData = nullptr; } static void ImGui_ImplDX11_SetWindowSize(ImGuiViewport* viewport, ImVec2 size) { ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData; if (vd->RTView) { vd->RTView->Release(); vd->RTView = nullptr; } if (vd->SwapChain) { ID3D11Texture2D* pBackBuffer = nullptr; vd->SwapChain->ResizeBuffers(0, (UINT)size.x, (UINT)size.y, DXGI_FORMAT_UNKNOWN, 0); vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer)); if (pBackBuffer == nullptr) { fprintf(stderr, "ImGui_ImplDX11_SetWindowSize() failed creating buffers.\n"); return; } bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &vd->RTView); pBackBuffer->Release(); } } static void ImGui_ImplDX11_RenderWindow(ImGuiViewport* viewport, void*) { ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData; ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f); bd->pd3dDeviceContext->OMSetRenderTargets(1, &vd->RTView, nullptr); if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear)) bd->pd3dDeviceContext->ClearRenderTargetView(vd->RTView, (float*)&clear_color); ImGui_ImplDX11_RenderDrawData(viewport->DrawData); } static void ImGui_ImplDX11_SwapBuffers(ImGuiViewport* viewport, void*) { ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData; vd->SwapChain->Present(0, 0); // Present without vsync } static void ImGui_ImplDX11_InitPlatformInterface() { ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO(); platform_io.Renderer_CreateWindow = ImGui_ImplDX11_CreateWindow; platform_io.Renderer_DestroyWindow = ImGui_ImplDX11_DestroyWindow; platform_io.Renderer_SetWindowSize = ImGui_ImplDX11_SetWindowSize; platform_io.Renderer_RenderWindow = ImGui_ImplDX11_RenderWindow; platform_io.Renderer_SwapBuffers = ImGui_ImplDX11_SwapBuffers; } static void ImGui_ImplDX11_ShutdownPlatformInterface() { ImGui::DestroyPlatformWindows(); }