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Diffstat (limited to 'lib/imgui-1.90.7/backends/imgui_impl_dx11.cpp')
| -rw-r--r-- | lib/imgui-1.90.7/backends/imgui_impl_dx11.cpp | 606 |
1 files changed, 606 insertions, 0 deletions
diff --git a/lib/imgui-1.90.7/backends/imgui_impl_dx11.cpp b/lib/imgui-1.90.7/backends/imgui_impl_dx11.cpp new file mode 100644 index 0000000..167bda6 --- /dev/null +++ b/lib/imgui-1.90.7/backends/imgui_impl_dx11.cpp @@ -0,0 +1,606 @@ +// 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. + +// 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 + +// CHANGELOG +// (minor and older changes stripped away, please see git history for details) +// 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" +#ifndef IMGUI_DISABLE +#include "imgui_impl_dx11.h" + +// DirectX +#include <stdio.h> +#include <d3d11.h> +#include <d3dcompiler.h> +#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; +} + +// 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.h> / 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)offsetof(ImDrawVert, pos), D3D11_INPUT_PER_VERTEX_DATA, 0 }, + { "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, (UINT)offsetof(ImDrawVert, uv), D3D11_INPUT_PER_VERTEX_DATA, 0 }, + { "COLOR", 0, DXGI_FORMAT_R8G8B8A8_UNORM, 0, (UINT)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(); + IMGUI_CHECKVERSION(); + 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. + + // 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(); + + 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_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; + IM_DELETE(bd); +} + +void ImGui_ImplDX11_NewFrame() +{ + ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData(); + IM_ASSERT(bd != nullptr && "Context or backend not initialized! Did you call ImGui_ImplDX11_Init()?"); + + if (!bd->pFontSampler) + ImGui_ImplDX11_CreateDeviceObjects(); +} + +//----------------------------------------------------------------------------- + +#endif // #ifndef IMGUI_DISABLE |