1// dear imgui: Renderer Backend for DirectX11
2// This needs to be used along with a Platform Backend (e.g. Win32)
3
4// Implemented features:
5// [X] Renderer: User texture binding. Use 'ID3D11ShaderResourceView*' as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!
6// [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset).
7// [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
8// [X] Renderer: Expose selected render state for draw callbacks to use. Access in '(ImGui_ImplXXXX_RenderState*)GetPlatformIO().Renderer_RenderState'.
9// [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
10
11// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
12// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
13// Learn about Dear ImGui:
14// - FAQ https://dearimgui.com/faq
15// - Getting Started https://dearimgui.com/getting-started
16// - Documentation https://dearimgui.com/docs (same as your local docs/ folder).
17// - Introduction, links and more at the top of imgui.cpp
18
19// CHANGELOG
20// (minor and older changes stripped away, please see git history for details)
21// 2025-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
22// 2025-06-11: DirectX11: Added support for ImGuiBackendFlags_RendererHasTextures, for dynamic font atlas.
23// 2025-05-07: DirectX11: Honor draw_data->FramebufferScale to allow for custom backends and experiment using it (consistently with other renderer backends, even though in normal condition it is not set under Windows).
24// 2025-02-24: [Docking] Added undocumented ImGui_ImplDX11_SetSwapChainDescs() to configure swap chain creation for secondary viewports.
25// 2025-01-06: DirectX11: Expose VertexConstantBuffer in ImGui_ImplDX11_RenderState. Reset projection matrix in ImDrawCallback_ResetRenderState handler.
26// 2024-10-07: DirectX11: Changed default texture sampler to Clamp instead of Repeat/Wrap.
27// 2024-10-07: DirectX11: Expose selected render state in ImGui_ImplDX11_RenderState, which you can access in 'void* platform_io.Renderer_RenderState' during draw callbacks.
28// 2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
29// 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).
30// 2021-05-19: DirectX11: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
31// 2021-02-18: DirectX11: Change blending equation to preserve alpha in output buffer.
32// 2019-08-01: DirectX11: Fixed code querying the Geometry Shader state (would generally error with Debug layer enabled).
33// 2019-07-21: DirectX11: Backup, clear and restore Geometry Shader is any is bound when calling ImGui_ImplDX11_RenderDrawData. Clearing Hull/Domain/Compute shaders without backup/restore.
34// 2019-05-29: DirectX11: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
35// 2019-04-30: DirectX11: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
36// 2018-12-03: Misc: Added #pragma comment statement to automatically link with d3dcompiler.lib when using D3DCompile().
37// 2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
38// 2018-08-01: DirectX11: Querying for IDXGIFactory instead of IDXGIFactory1 to increase compatibility.
39// 2018-07-13: DirectX11: Fixed unreleased resources in Init and Shutdown functions.
40// 2018-06-08: Misc: Extracted imgui_impl_dx11.cpp/.h away from the old combined DX11+Win32 example.
41// 2018-06-08: DirectX11: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
42// 2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX11_RenderDrawData() in the .h file so you can call it yourself.
43// 2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
44// 2016-05-07: DirectX11: Disabling depth-write.
45
46#include "imgui.h"
47#ifndef IMGUI_DISABLE
48#include "imgui_impl_dx11.h"
49
50// DirectX
51#include <stdio.h>
52#include <d3d11.h>
53#include <d3dcompiler.h>
54#ifdef _MSC_VER
55#pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below.
56#endif
57
58// Clang/GCC warnings with -Weverything
59#if defined(__clang__)
60#pragma clang diagnostic ignored "-Wold-style-cast" // warning: use of old-style cast // yes, they are more terse.
61#pragma clang diagnostic ignored "-Wsign-conversion" // warning: implicit conversion changes signedness
62#endif
63
64// DirectX11 data
65struct ImGui_ImplDX11_Texture
66{
67 ID3D11Texture2D* pTexture;
68 ID3D11ShaderResourceView* pTextureView;
69};
70
71struct ImGui_ImplDX11_Data
72{
73 ID3D11Device* pd3dDevice;
74 ID3D11DeviceContext* pd3dDeviceContext;
75 IDXGIFactory* pFactory;
76 ID3D11Buffer* pVB;
77 ID3D11Buffer* pIB;
78 ID3D11VertexShader* pVertexShader;
79 ID3D11InputLayout* pInputLayout;
80 ID3D11Buffer* pVertexConstantBuffer;
81 ID3D11PixelShader* pPixelShader;
82 ID3D11SamplerState* pFontSampler;
83 ID3D11RasterizerState* pRasterizerState;
84 ID3D11BlendState* pBlendState;
85 ID3D11DepthStencilState* pDepthStencilState;
86 int VertexBufferSize;
87 int IndexBufferSize;
88 ImVector<DXGI_SWAP_CHAIN_DESC> SwapChainDescsForViewports;
89
90 ImGui_ImplDX11_Data() { memset(s: (void*)this, c: 0, n: sizeof(*this)); VertexBufferSize = 5000; IndexBufferSize = 10000; }
91};
92
93struct VERTEX_CONSTANT_BUFFER_DX11
94{
95 float mvp[4][4];
96};
97
98// Backend data stored in io.BackendRendererUserData to allow support for multiple Dear ImGui contexts
99// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
100static ImGui_ImplDX11_Data* ImGui_ImplDX11_GetBackendData()
101{
102 return ImGui::GetCurrentContext() ? (ImGui_ImplDX11_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
103}
104
105// Forward Declarations
106static void ImGui_ImplDX11_InitMultiViewportSupport();
107static void ImGui_ImplDX11_ShutdownMultiViewportSupport();
108
109// Functions
110static void ImGui_ImplDX11_SetupRenderState(ImDrawData* draw_data, ID3D11DeviceContext* device_ctx)
111{
112 ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
113
114 // Setup viewport
115 D3D11_VIEWPORT vp = {};
116 vp.Width = draw_data->DisplaySize.x * draw_data->FramebufferScale.x;
117 vp.Height = draw_data->DisplaySize.y * draw_data->FramebufferScale.y;
118 vp.MinDepth = 0.0f;
119 vp.MaxDepth = 1.0f;
120 vp.TopLeftX = vp.TopLeftY = 0;
121 device_ctx->RSSetViewports(1, &vp);
122
123 // Setup orthographic projection matrix into our constant buffer
124 // 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.
125 D3D11_MAPPED_SUBRESOURCE mapped_resource;
126 if (device_ctx->Map(bd->pVertexConstantBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mapped_resource) == S_OK)
127 {
128 VERTEX_CONSTANT_BUFFER_DX11* constant_buffer = (VERTEX_CONSTANT_BUFFER_DX11*)mapped_resource.pData;
129 float L = draw_data->DisplayPos.x;
130 float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
131 float T = draw_data->DisplayPos.y;
132 float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
133 float mvp[4][4] =
134 {
135 { 2.0f/(R-L), 0.0f, 0.0f, 0.0f },
136 { 0.0f, 2.0f/(T-B), 0.0f, 0.0f },
137 { 0.0f, 0.0f, 0.5f, 0.0f },
138 { (R+L)/(L-R), (T+B)/(B-T), 0.5f, 1.0f },
139 };
140 memcpy(dest: &constant_buffer->mvp, src: mvp, n: sizeof(mvp));
141 device_ctx->Unmap(bd->pVertexConstantBuffer, 0);
142 }
143
144 // Setup shader and vertex buffers
145 unsigned int stride = sizeof(ImDrawVert);
146 unsigned int offset = 0;
147 device_ctx->IASetInputLayout(bd->pInputLayout);
148 device_ctx->IASetVertexBuffers(0, 1, &bd->pVB, &stride, &offset);
149 device_ctx->IASetIndexBuffer(bd->pIB, sizeof(ImDrawIdx) == 2 ? DXGI_FORMAT_R16_UINT : DXGI_FORMAT_R32_UINT, 0);
150 device_ctx->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
151 device_ctx->VSSetShader(bd->pVertexShader, nullptr, 0);
152 device_ctx->VSSetConstantBuffers(0, 1, &bd->pVertexConstantBuffer);
153 device_ctx->PSSetShader(bd->pPixelShader, nullptr, 0);
154 device_ctx->PSSetSamplers(0, 1, &bd->pFontSampler);
155 device_ctx->GSSetShader(nullptr, nullptr, 0);
156 device_ctx->HSSetShader(nullptr, nullptr, 0); // In theory we should backup and restore this as well.. very infrequently used..
157 device_ctx->DSSetShader(nullptr, nullptr, 0); // In theory we should backup and restore this as well.. very infrequently used..
158 device_ctx->CSSetShader(nullptr, nullptr, 0); // In theory we should backup and restore this as well.. very infrequently used..
159
160 // Setup render state
161 const float blend_factor[4] = { 0.f, 0.f, 0.f, 0.f };
162 device_ctx->OMSetBlendState(bd->pBlendState, blend_factor, 0xffffffff);
163 device_ctx->OMSetDepthStencilState(bd->pDepthStencilState, 0);
164 device_ctx->RSSetState(bd->pRasterizerState);
165}
166
167// Render function
168void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
169{
170 // Avoid rendering when minimized
171 if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
172 return;
173
174 ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
175 ID3D11DeviceContext* device = bd->pd3dDeviceContext;
176
177 // Catch up with texture updates. Most of the times, the list will have 1 element with an OK status, aka nothing to do.
178 // (This almost always points to ImGui::GetPlatformIO().Textures[] but is part of ImDrawData to allow overriding or disabling texture updates).
179 if (draw_data->Textures != nullptr)
180 for (ImTextureData* tex : *draw_data->Textures)
181 if (tex->Status != ImTextureStatus_OK)
182 ImGui_ImplDX11_UpdateTexture(tex);
183
184 // Create and grow vertex/index buffers if needed
185 if (!bd->pVB || bd->VertexBufferSize < draw_data->TotalVtxCount)
186 {
187 if (bd->pVB) { bd->pVB->Release(); bd->pVB = nullptr; }
188 bd->VertexBufferSize = draw_data->TotalVtxCount + 5000;
189 D3D11_BUFFER_DESC desc = {};
190 desc.Usage = D3D11_USAGE_DYNAMIC;
191 desc.ByteWidth = bd->VertexBufferSize * sizeof(ImDrawVert);
192 desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
193 desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
194 desc.MiscFlags = 0;
195 if (bd->pd3dDevice->CreateBuffer(&desc, nullptr, &bd->pVB) < 0)
196 return;
197 }
198 if (!bd->pIB || bd->IndexBufferSize < draw_data->TotalIdxCount)
199 {
200 if (bd->pIB) { bd->pIB->Release(); bd->pIB = nullptr; }
201 bd->IndexBufferSize = draw_data->TotalIdxCount + 10000;
202 D3D11_BUFFER_DESC desc = {};
203 desc.Usage = D3D11_USAGE_DYNAMIC;
204 desc.ByteWidth = bd->IndexBufferSize * sizeof(ImDrawIdx);
205 desc.BindFlags = D3D11_BIND_INDEX_BUFFER;
206 desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
207 if (bd->pd3dDevice->CreateBuffer(&desc, nullptr, &bd->pIB) < 0)
208 return;
209 }
210
211 // Upload vertex/index data into a single contiguous GPU buffer
212 D3D11_MAPPED_SUBRESOURCE vtx_resource, idx_resource;
213 if (device->Map(bd->pVB, 0, D3D11_MAP_WRITE_DISCARD, 0, &vtx_resource) != S_OK)
214 return;
215 if (device->Map(bd->pIB, 0, D3D11_MAP_WRITE_DISCARD, 0, &idx_resource) != S_OK)
216 return;
217 ImDrawVert* vtx_dst = (ImDrawVert*)vtx_resource.pData;
218 ImDrawIdx* idx_dst = (ImDrawIdx*)idx_resource.pData;
219 for (const ImDrawList* draw_list : draw_data->CmdLists)
220 {
221 memcpy(dest: vtx_dst, src: draw_list->VtxBuffer.Data, n: draw_list->VtxBuffer.Size * sizeof(ImDrawVert));
222 memcpy(dest: idx_dst, src: draw_list->IdxBuffer.Data, n: draw_list->IdxBuffer.Size * sizeof(ImDrawIdx));
223 vtx_dst += draw_list->VtxBuffer.Size;
224 idx_dst += draw_list->IdxBuffer.Size;
225 }
226 device->Unmap(bd->pVB, 0);
227 device->Unmap(bd->pIB, 0);
228
229 // Backup DX state that will be modified to restore it afterwards (unfortunately this is very ugly looking and verbose. Close your eyes!)
230 struct BACKUP_DX11_STATE
231 {
232 UINT ScissorRectsCount, ViewportsCount;
233 D3D11_RECT ScissorRects[D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE];
234 D3D11_VIEWPORT Viewports[D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE];
235 ID3D11RasterizerState* RS;
236 ID3D11BlendState* BlendState;
237 FLOAT BlendFactor[4];
238 UINT SampleMask;
239 UINT StencilRef;
240 ID3D11DepthStencilState* DepthStencilState;
241 ID3D11ShaderResourceView* PSShaderResource;
242 ID3D11SamplerState* PSSampler;
243 ID3D11PixelShader* PS;
244 ID3D11VertexShader* VS;
245 ID3D11GeometryShader* GS;
246 UINT PSInstancesCount, VSInstancesCount, GSInstancesCount;
247 ID3D11ClassInstance *PSInstances[256], *VSInstances[256], *GSInstances[256]; // 256 is max according to PSSetShader documentation
248 D3D11_PRIMITIVE_TOPOLOGY PrimitiveTopology;
249 ID3D11Buffer* IndexBuffer, *VertexBuffer, *VSConstantBuffer;
250 UINT IndexBufferOffset, VertexBufferStride, VertexBufferOffset;
251 DXGI_FORMAT IndexBufferFormat;
252 ID3D11InputLayout* InputLayout;
253 };
254 BACKUP_DX11_STATE old = {};
255 old.ScissorRectsCount = old.ViewportsCount = D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE;
256 device->RSGetScissorRects(&old.ScissorRectsCount, old.ScissorRects);
257 device->RSGetViewports(&old.ViewportsCount, old.Viewports);
258 device->RSGetState(&old.RS);
259 device->OMGetBlendState(&old.BlendState, old.BlendFactor, &old.SampleMask);
260 device->OMGetDepthStencilState(&old.DepthStencilState, &old.StencilRef);
261 device->PSGetShaderResources(0, 1, &old.PSShaderResource);
262 device->PSGetSamplers(0, 1, &old.PSSampler);
263 old.PSInstancesCount = old.VSInstancesCount = old.GSInstancesCount = 256;
264 device->PSGetShader(&old.PS, old.PSInstances, &old.PSInstancesCount);
265 device->VSGetShader(&old.VS, old.VSInstances, &old.VSInstancesCount);
266 device->VSGetConstantBuffers(0, 1, &old.VSConstantBuffer);
267 device->GSGetShader(&old.GS, old.GSInstances, &old.GSInstancesCount);
268
269 device->IAGetPrimitiveTopology(&old.PrimitiveTopology);
270 device->IAGetIndexBuffer(&old.IndexBuffer, &old.IndexBufferFormat, &old.IndexBufferOffset);
271 device->IAGetVertexBuffers(0, 1, &old.VertexBuffer, &old.VertexBufferStride, &old.VertexBufferOffset);
272 device->IAGetInputLayout(&old.InputLayout);
273
274 // Setup desired DX state
275 ImGui_ImplDX11_SetupRenderState(draw_data, device_ctx: device);
276
277 // Setup render state structure (for callbacks and custom texture bindings)
278 ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
279 ImGui_ImplDX11_RenderState render_state;
280 render_state.Device = bd->pd3dDevice;
281 render_state.DeviceContext = bd->pd3dDeviceContext;
282 render_state.SamplerDefault = bd->pFontSampler;
283 render_state.VertexConstantBuffer = bd->pVertexConstantBuffer;
284 platform_io.Renderer_RenderState = &render_state;
285
286 // Render command lists
287 // (Because we merged all buffers into a single one, we maintain our own offset into them)
288 int global_idx_offset = 0;
289 int global_vtx_offset = 0;
290 ImVec2 clip_off = draw_data->DisplayPos;
291 ImVec2 clip_scale = draw_data->FramebufferScale;
292 for (const ImDrawList* draw_list : draw_data->CmdLists)
293 {
294 for (int cmd_i = 0; cmd_i < draw_list->CmdBuffer.Size; cmd_i++)
295 {
296 const ImDrawCmd* pcmd = &draw_list->CmdBuffer[cmd_i];
297 if (pcmd->UserCallback != nullptr)
298 {
299 // User callback, registered via ImDrawList::AddCallback()
300 // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
301 if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
302 ImGui_ImplDX11_SetupRenderState(draw_data, device_ctx: device);
303 else
304 pcmd->UserCallback(draw_list, pcmd);
305 }
306 else
307 {
308 // Project scissor/clipping rectangles into framebuffer space
309 ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y);
310 ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y);
311 if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
312 continue;
313
314 // Apply scissor/clipping rectangle
315 const D3D11_RECT r = { (LONG)clip_min.x, (LONG)clip_min.y, (LONG)clip_max.x, (LONG)clip_max.y };
316 device->RSSetScissorRects(1, &r);
317
318 // Bind texture, Draw
319 ID3D11ShaderResourceView* texture_srv = (ID3D11ShaderResourceView*)pcmd->GetTexID();
320 device->PSSetShaderResources(0, 1, &texture_srv);
321 device->DrawIndexed(pcmd->ElemCount, pcmd->IdxOffset + global_idx_offset, pcmd->VtxOffset + global_vtx_offset);
322 }
323 }
324 global_idx_offset += draw_list->IdxBuffer.Size;
325 global_vtx_offset += draw_list->VtxBuffer.Size;
326 }
327 platform_io.Renderer_RenderState = nullptr;
328
329 // Restore modified DX state
330 device->RSSetScissorRects(old.ScissorRectsCount, old.ScissorRects);
331 device->RSSetViewports(old.ViewportsCount, old.Viewports);
332 device->RSSetState(old.RS); if (old.RS) old.RS->Release();
333 device->OMSetBlendState(old.BlendState, old.BlendFactor, old.SampleMask); if (old.BlendState) old.BlendState->Release();
334 device->OMSetDepthStencilState(old.DepthStencilState, old.StencilRef); if (old.DepthStencilState) old.DepthStencilState->Release();
335 device->PSSetShaderResources(0, 1, &old.PSShaderResource); if (old.PSShaderResource) old.PSShaderResource->Release();
336 device->PSSetSamplers(0, 1, &old.PSSampler); if (old.PSSampler) old.PSSampler->Release();
337 device->PSSetShader(old.PS, old.PSInstances, old.PSInstancesCount); if (old.PS) old.PS->Release();
338 for (UINT i = 0; i < old.PSInstancesCount; i++) if (old.PSInstances[i]) old.PSInstances[i]->Release();
339 device->VSSetShader(old.VS, old.VSInstances, old.VSInstancesCount); if (old.VS) old.VS->Release();
340 device->VSSetConstantBuffers(0, 1, &old.VSConstantBuffer); if (old.VSConstantBuffer) old.VSConstantBuffer->Release();
341 device->GSSetShader(old.GS, old.GSInstances, old.GSInstancesCount); if (old.GS) old.GS->Release();
342 for (UINT i = 0; i < old.VSInstancesCount; i++) if (old.VSInstances[i]) old.VSInstances[i]->Release();
343 device->IASetPrimitiveTopology(old.PrimitiveTopology);
344 device->IASetIndexBuffer(old.IndexBuffer, old.IndexBufferFormat, old.IndexBufferOffset); if (old.IndexBuffer) old.IndexBuffer->Release();
345 device->IASetVertexBuffers(0, 1, &old.VertexBuffer, &old.VertexBufferStride, &old.VertexBufferOffset); if (old.VertexBuffer) old.VertexBuffer->Release();
346 device->IASetInputLayout(old.InputLayout); if (old.InputLayout) old.InputLayout->Release();
347}
348
349static void ImGui_ImplDX11_DestroyTexture(ImTextureData* tex)
350{
351 ImGui_ImplDX11_Texture* backend_tex = (ImGui_ImplDX11_Texture*)tex->BackendUserData;
352 if (backend_tex == nullptr)
353 return;
354 IM_ASSERT(backend_tex->pTextureView == (ID3D11ShaderResourceView*)(intptr_t)tex->TexID);
355 backend_tex->pTextureView->Release();
356 backend_tex->pTexture->Release();
357 IM_DELETE(p: backend_tex);
358
359 // Clear identifiers and mark as destroyed (in order to allow e.g. calling InvalidateDeviceObjects while running)
360 tex->SetTexID(ImTextureID_Invalid);
361 tex->SetStatus(ImTextureStatus_Destroyed);
362 tex->BackendUserData = nullptr;
363}
364
365void ImGui_ImplDX11_UpdateTexture(ImTextureData* tex)
366{
367 ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
368 if (tex->Status == ImTextureStatus_WantCreate)
369 {
370 // Create and upload new texture to graphics system
371 //IMGUI_DEBUG_LOG("UpdateTexture #%03d: WantCreate %dx%d\n", tex->UniqueID, tex->Width, tex->Height);
372 IM_ASSERT(tex->TexID == ImTextureID_Invalid && tex->BackendUserData == nullptr);
373 IM_ASSERT(tex->Format == ImTextureFormat_RGBA32);
374 unsigned int* pixels = (unsigned int*)tex->GetPixels();
375 ImGui_ImplDX11_Texture* backend_tex = IM_NEW(ImGui_ImplDX11_Texture)();
376
377 // Create texture
378 D3D11_TEXTURE2D_DESC desc;
379 ZeroMemory(&desc, sizeof(desc));
380 desc.Width = (UINT)tex->Width;
381 desc.Height = (UINT)tex->Height;
382 desc.MipLevels = 1;
383 desc.ArraySize = 1;
384 desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
385 desc.SampleDesc.Count = 1;
386 desc.Usage = D3D11_USAGE_DEFAULT;
387 desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
388 desc.CPUAccessFlags = 0;
389 D3D11_SUBRESOURCE_DATA subResource;
390 subResource.pSysMem = pixels;
391 subResource.SysMemPitch = desc.Width * 4;
392 subResource.SysMemSlicePitch = 0;
393 bd->pd3dDevice->CreateTexture2D(&desc, &subResource, &backend_tex->pTexture);
394 IM_ASSERT(backend_tex->pTexture != nullptr && "Backend failed to create texture!");
395
396 // Create texture view
397 D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
398 ZeroMemory(&srvDesc, sizeof(srvDesc));
399 srvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
400 srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
401 srvDesc.Texture2D.MipLevels = desc.MipLevels;
402 srvDesc.Texture2D.MostDetailedMip = 0;
403 bd->pd3dDevice->CreateShaderResourceView(backend_tex->pTexture, &srvDesc, &backend_tex->pTextureView);
404 IM_ASSERT(backend_tex->pTextureView != nullptr && "Backend failed to create texture!");
405
406 // Store identifiers
407 tex->SetTexID((ImTextureID)(intptr_t)backend_tex->pTextureView);
408 tex->SetStatus(ImTextureStatus_OK);
409 tex->BackendUserData = backend_tex;
410 }
411 else if (tex->Status == ImTextureStatus_WantUpdates)
412 {
413 // Update selected blocks. We only ever write to textures regions which have never been used before!
414 // This backend choose to use tex->Updates[] but you can use tex->UpdateRect to upload a single region.
415 ImGui_ImplDX11_Texture* backend_tex = (ImGui_ImplDX11_Texture*)tex->BackendUserData;
416 IM_ASSERT(backend_tex->pTextureView == (ID3D11ShaderResourceView*)(intptr_t)tex->TexID);
417 for (ImTextureRect& r : tex->Updates)
418 {
419 D3D11_BOX box = { (UINT)r.x, (UINT)r.y, (UINT)0, (UINT)(r.x + r.w), (UINT)(r.y + r .h), (UINT)1 };
420 bd->pd3dDeviceContext->UpdateSubresource(backend_tex->pTexture, 0, &box, tex->GetPixelsAt(r.x, r.y), (UINT)tex->GetPitch(), 0);
421 }
422 tex->SetStatus(ImTextureStatus_OK);
423 }
424 if (tex->Status == ImTextureStatus_WantDestroy && tex->UnusedFrames > 0)
425 ImGui_ImplDX11_DestroyTexture(tex);
426}
427
428bool ImGui_ImplDX11_CreateDeviceObjects()
429{
430 ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
431 if (!bd->pd3dDevice)
432 return false;
433 ImGui_ImplDX11_InvalidateDeviceObjects();
434
435 // By using D3DCompile() from <d3dcompiler.h> / d3dcompiler.lib, we introduce a dependency to a given version of d3dcompiler_XX.dll (see D3DCOMPILER_DLL_A)
436 // If you would like to use this DX11 sample code but remove this dependency you can:
437 // 1) compile once, save the compiled shader blobs into a file or source code and pass them to CreateVertexShader()/CreatePixelShader() [preferred solution]
438 // 2) use code to detect any version of the DLL and grab a pointer to D3DCompile from the DLL.
439 // See https://github.com/ocornut/imgui/pull/638 for sources and details.
440
441 // Create the vertex shader
442 {
443 static const char* vertexShader =
444 "cbuffer vertexBuffer : register(b0) \
445 {\
446 float4x4 ProjectionMatrix; \
447 };\
448 struct VS_INPUT\
449 {\
450 float2 pos : POSITION;\
451 float4 col : COLOR0;\
452 float2 uv : TEXCOORD0;\
453 };\
454 \
455 struct PS_INPUT\
456 {\
457 float4 pos : SV_POSITION;\
458 float4 col : COLOR0;\
459 float2 uv : TEXCOORD0;\
460 };\
461 \
462 PS_INPUT main(VS_INPUT input)\
463 {\
464 PS_INPUT output;\
465 output.pos = mul( ProjectionMatrix, float4(input.pos.xy, 0.f, 1.f));\
466 output.col = input.col;\
467 output.uv = input.uv;\
468 return output;\
469 }";
470
471 ID3DBlob* vertexShaderBlob;
472 if (FAILED(D3DCompile(vertexShader, strlen(s: vertexShader), nullptr, nullptr, nullptr, "main", "vs_4_0", 0, 0, &vertexShaderBlob, nullptr)))
473 return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
474 if (bd->pd3dDevice->CreateVertexShader(vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize(), nullptr, &bd->pVertexShader) != S_OK)
475 {
476 vertexShaderBlob->Release();
477 return false;
478 }
479
480 // Create the input layout
481 D3D11_INPUT_ELEMENT_DESC local_layout[] =
482 {
483 { "POSITION", 0, DXGI_FORMAT_R32G32_FLOAT, 0, (UINT)offsetof(ImDrawVert, pos), D3D11_INPUT_PER_VERTEX_DATA, 0 },
484 { "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, (UINT)offsetof(ImDrawVert, uv), D3D11_INPUT_PER_VERTEX_DATA, 0 },
485 { "COLOR", 0, DXGI_FORMAT_R8G8B8A8_UNORM, 0, (UINT)offsetof(ImDrawVert, col), D3D11_INPUT_PER_VERTEX_DATA, 0 },
486 };
487 if (bd->pd3dDevice->CreateInputLayout(local_layout, 3, vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize(), &bd->pInputLayout) != S_OK)
488 {
489 vertexShaderBlob->Release();
490 return false;
491 }
492 vertexShaderBlob->Release();
493
494 // Create the constant buffer
495 {
496 D3D11_BUFFER_DESC desc = {};
497 desc.ByteWidth = sizeof(VERTEX_CONSTANT_BUFFER_DX11);
498 desc.Usage = D3D11_USAGE_DYNAMIC;
499 desc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
500 desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
501 desc.MiscFlags = 0;
502 bd->pd3dDevice->CreateBuffer(&desc, nullptr, &bd->pVertexConstantBuffer);
503 }
504 }
505
506 // Create the pixel shader
507 {
508 static const char* pixelShader =
509 "struct PS_INPUT\
510 {\
511 float4 pos : SV_POSITION;\
512 float4 col : COLOR0;\
513 float2 uv : TEXCOORD0;\
514 };\
515 sampler sampler0;\
516 Texture2D texture0;\
517 \
518 float4 main(PS_INPUT input) : SV_Target\
519 {\
520 float4 out_col = input.col * texture0.Sample(sampler0, input.uv); \
521 return out_col; \
522 }";
523
524 ID3DBlob* pixelShaderBlob;
525 if (FAILED(D3DCompile(pixelShader, strlen(s: pixelShader), nullptr, nullptr, nullptr, "main", "ps_4_0", 0, 0, &pixelShaderBlob, nullptr)))
526 return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
527 if (bd->pd3dDevice->CreatePixelShader(pixelShaderBlob->GetBufferPointer(), pixelShaderBlob->GetBufferSize(), nullptr, &bd->pPixelShader) != S_OK)
528 {
529 pixelShaderBlob->Release();
530 return false;
531 }
532 pixelShaderBlob->Release();
533 }
534
535 // Create the blending setup
536 {
537 D3D11_BLEND_DESC desc;
538 ZeroMemory(&desc, sizeof(desc));
539 desc.AlphaToCoverageEnable = false;
540 desc.RenderTarget[0].BlendEnable = true;
541 desc.RenderTarget[0].SrcBlend = D3D11_BLEND_SRC_ALPHA;
542 desc.RenderTarget[0].DestBlend = D3D11_BLEND_INV_SRC_ALPHA;
543 desc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
544 desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ONE;
545 desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_INV_SRC_ALPHA;
546 desc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
547 desc.RenderTarget[0].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
548 bd->pd3dDevice->CreateBlendState(&desc, &bd->pBlendState);
549 }
550
551 // Create the rasterizer state
552 {
553 D3D11_RASTERIZER_DESC desc;
554 ZeroMemory(&desc, sizeof(desc));
555 desc.FillMode = D3D11_FILL_SOLID;
556 desc.CullMode = D3D11_CULL_NONE;
557 desc.ScissorEnable = true;
558 desc.DepthClipEnable = true;
559 bd->pd3dDevice->CreateRasterizerState(&desc, &bd->pRasterizerState);
560 }
561
562 // Create depth-stencil State
563 {
564 D3D11_DEPTH_STENCIL_DESC desc;
565 ZeroMemory(&desc, sizeof(desc));
566 desc.DepthEnable = false;
567 desc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
568 desc.DepthFunc = D3D11_COMPARISON_ALWAYS;
569 desc.StencilEnable = false;
570 desc.FrontFace.StencilFailOp = desc.FrontFace.StencilDepthFailOp = desc.FrontFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
571 desc.FrontFace.StencilFunc = D3D11_COMPARISON_ALWAYS;
572 desc.BackFace = desc.FrontFace;
573 bd->pd3dDevice->CreateDepthStencilState(&desc, &bd->pDepthStencilState);
574 }
575
576 // Create texture sampler
577 // (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling)
578 {
579 D3D11_SAMPLER_DESC desc;
580 ZeroMemory(&desc, sizeof(desc));
581 desc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
582 desc.AddressU = D3D11_TEXTURE_ADDRESS_CLAMP;
583 desc.AddressV = D3D11_TEXTURE_ADDRESS_CLAMP;
584 desc.AddressW = D3D11_TEXTURE_ADDRESS_CLAMP;
585 desc.MipLODBias = 0.f;
586 desc.ComparisonFunc = D3D11_COMPARISON_ALWAYS;
587 desc.MinLOD = 0.f;
588 desc.MaxLOD = 0.f;
589 bd->pd3dDevice->CreateSamplerState(&desc, &bd->pFontSampler);
590 }
591
592 return true;
593}
594
595void ImGui_ImplDX11_InvalidateDeviceObjects()
596{
597 ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
598 if (!bd->pd3dDevice)
599 return;
600
601 // Destroy all textures
602 for (ImTextureData* tex : ImGui::GetPlatformIO().Textures)
603 if (tex->RefCount == 1)
604 ImGui_ImplDX11_DestroyTexture(tex);
605
606 if (bd->pFontSampler) { bd->pFontSampler->Release(); bd->pFontSampler = nullptr; }
607 if (bd->pIB) { bd->pIB->Release(); bd->pIB = nullptr; }
608 if (bd->pVB) { bd->pVB->Release(); bd->pVB = nullptr; }
609 if (bd->pBlendState) { bd->pBlendState->Release(); bd->pBlendState = nullptr; }
610 if (bd->pDepthStencilState) { bd->pDepthStencilState->Release(); bd->pDepthStencilState = nullptr; }
611 if (bd->pRasterizerState) { bd->pRasterizerState->Release(); bd->pRasterizerState = nullptr; }
612 if (bd->pPixelShader) { bd->pPixelShader->Release(); bd->pPixelShader = nullptr; }
613 if (bd->pVertexConstantBuffer) { bd->pVertexConstantBuffer->Release(); bd->pVertexConstantBuffer = nullptr; }
614 if (bd->pInputLayout) { bd->pInputLayout->Release(); bd->pInputLayout = nullptr; }
615 if (bd->pVertexShader) { bd->pVertexShader->Release(); bd->pVertexShader = nullptr; }
616}
617
618bool ImGui_ImplDX11_Init(ID3D11Device* device, ID3D11DeviceContext* device_context)
619{
620 ImGuiIO& io = ImGui::GetIO();
621 IMGUI_CHECKVERSION();
622 IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
623
624 // Setup backend capabilities flags
625 ImGui_ImplDX11_Data* bd = IM_NEW(ImGui_ImplDX11_Data)();
626 io.BackendRendererUserData = (void*)bd;
627 io.BackendRendererName = "imgui_impl_dx11";
628 io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset; // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
629 io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures; // We can honor ImGuiPlatformIO::Textures[] requests during render.
630 io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports; // We can create multi-viewports on the Renderer side (optional)
631
632 ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
633 platform_io.Renderer_TextureMaxWidth = platform_io.Renderer_TextureMaxHeight = D3D11_REQ_TEXTURE2D_U_OR_V_DIMENSION;
634
635 // Get factory from device
636 IDXGIDevice* pDXGIDevice = nullptr;
637 IDXGIAdapter* pDXGIAdapter = nullptr;
638 IDXGIFactory* pFactory = nullptr;
639
640 if (device->QueryInterface(IID_PPV_ARGS(&pDXGIDevice)) == S_OK)
641 if (pDXGIDevice->GetParent(IID_PPV_ARGS(&pDXGIAdapter)) == S_OK)
642 if (pDXGIAdapter->GetParent(IID_PPV_ARGS(&pFactory)) == S_OK)
643 {
644 bd->pd3dDevice = device;
645 bd->pd3dDeviceContext = device_context;
646 bd->pFactory = pFactory;
647 }
648 if (pDXGIDevice) pDXGIDevice->Release();
649 if (pDXGIAdapter) pDXGIAdapter->Release();
650 bd->pd3dDevice->AddRef();
651 bd->pd3dDeviceContext->AddRef();
652
653 ImGui_ImplDX11_InitMultiViewportSupport();
654
655 return true;
656}
657
658void ImGui_ImplDX11_Shutdown()
659{
660 ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
661 IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
662 ImGuiIO& io = ImGui::GetIO();
663
664 ImGui_ImplDX11_ShutdownMultiViewportSupport();
665 ImGui_ImplDX11_InvalidateDeviceObjects();
666 if (bd->pFactory) { bd->pFactory->Release(); }
667 if (bd->pd3dDevice) { bd->pd3dDevice->Release(); }
668 if (bd->pd3dDeviceContext) { bd->pd3dDeviceContext->Release(); }
669 io.BackendRendererName = nullptr;
670 io.BackendRendererUserData = nullptr;
671 io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures | ImGuiBackendFlags_RendererHasViewports);
672 IM_DELETE(p: bd);
673}
674
675void ImGui_ImplDX11_NewFrame()
676{
677 ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
678 IM_ASSERT(bd != nullptr && "Context or backend not initialized! Did you call ImGui_ImplDX11_Init()?");
679
680 if (!bd->pVertexShader)
681 if (!ImGui_ImplDX11_CreateDeviceObjects())
682 IM_ASSERT(0 && "ImGui_ImplDX11_CreateDeviceObjects() failed!");
683}
684
685//--------------------------------------------------------------------------------------------------------
686// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
687// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
688// 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..
689//--------------------------------------------------------------------------------------------------------
690
691// Helper structure we store in the void* RendererUserData field of each ImGuiViewport to easily retrieve our backend data.
692struct ImGui_ImplDX11_ViewportData
693{
694 IDXGISwapChain* SwapChain;
695 ID3D11RenderTargetView* RTView;
696
697 ImGui_ImplDX11_ViewportData() { SwapChain = nullptr; RTView = nullptr; }
698 ~ImGui_ImplDX11_ViewportData() { IM_ASSERT(SwapChain == nullptr && RTView == nullptr); }
699};
700
701// Multi-Viewports: configure templates used when creating swapchains for secondary viewports. Will try them in order.
702// This is intentionally not declared in the .h file yet, so you will need to copy this declaration:
703void ImGui_ImplDX11_SetSwapChainDescs(const DXGI_SWAP_CHAIN_DESC* desc_templates, int desc_templates_count);
704void ImGui_ImplDX11_SetSwapChainDescs(const DXGI_SWAP_CHAIN_DESC* desc_templates, int desc_templates_count)
705{
706 ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
707 bd->SwapChainDescsForViewports.resize(new_size: desc_templates_count);
708 memcpy(dest: bd->SwapChainDescsForViewports.Data, src: desc_templates, n: sizeof(DXGI_SWAP_CHAIN_DESC));
709}
710
711static void ImGui_ImplDX11_CreateWindow(ImGuiViewport* viewport)
712{
713 ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
714 ImGui_ImplDX11_ViewportData* vd = IM_NEW(ImGui_ImplDX11_ViewportData)();
715 viewport->RendererUserData = vd;
716
717 // PlatformHandleRaw should always be a HWND, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL's WindowID).
718 // Some backends will leave PlatformHandleRaw == 0, in which case we assume PlatformHandle will contain the HWND.
719 HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle;
720 IM_ASSERT(hwnd != 0);
721 IM_ASSERT(vd->SwapChain == nullptr && vd->RTView == nullptr);
722
723 // Create swap chain
724 HRESULT hr = DXGI_ERROR_UNSUPPORTED;
725 for (const DXGI_SWAP_CHAIN_DESC& sd_template : bd->SwapChainDescsForViewports)
726 {
727 IM_ASSERT(sd_template.BufferDesc.Width == 0 && sd_template.BufferDesc.Height == 0 && sd_template.OutputWindow == nullptr);
728 DXGI_SWAP_CHAIN_DESC sd = sd_template;
729 sd.BufferDesc.Width = (UINT)viewport->Size.x;
730 sd.BufferDesc.Height = (UINT)viewport->Size.y;
731 sd.OutputWindow = hwnd;
732 hr = bd->pFactory->CreateSwapChain(bd->pd3dDevice, &sd, &vd->SwapChain);
733 if (SUCCEEDED(hr))
734 break;
735 }
736 IM_ASSERT(SUCCEEDED(hr));
737
738 // Create the render target
739 if (vd->SwapChain != nullptr)
740 {
741 ID3D11Texture2D* pBackBuffer;
742 vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
743 bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &vd->RTView);
744 pBackBuffer->Release();
745 }
746}
747
748static void ImGui_ImplDX11_DestroyWindow(ImGuiViewport* viewport)
749{
750 // The main viewport (owned by the application) will always have RendererUserData == nullptr since we didn't create the data for it.
751 if (ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData)
752 {
753 if (vd->SwapChain)
754 vd->SwapChain->Release();
755 vd->SwapChain = nullptr;
756 if (vd->RTView)
757 vd->RTView->Release();
758 vd->RTView = nullptr;
759 IM_DELETE(p: vd);
760 }
761 viewport->RendererUserData = nullptr;
762}
763
764static void ImGui_ImplDX11_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
765{
766 ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
767 ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData;
768 if (vd->RTView)
769 {
770 vd->RTView->Release();
771 vd->RTView = nullptr;
772 }
773 if (vd->SwapChain)
774 {
775 ID3D11Texture2D* pBackBuffer = nullptr;
776 vd->SwapChain->ResizeBuffers(0, (UINT)size.x, (UINT)size.y, DXGI_FORMAT_UNKNOWN, 0);
777 vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
778 if (pBackBuffer == nullptr) { fprintf(stderr, format: "ImGui_ImplDX11_SetWindowSize() failed creating buffers.\n"); return; }
779 bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &vd->RTView);
780 pBackBuffer->Release();
781 }
782}
783
784static void ImGui_ImplDX11_RenderWindow(ImGuiViewport* viewport, void*)
785{
786 ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
787 ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData;
788 ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
789 bd->pd3dDeviceContext->OMSetRenderTargets(1, &vd->RTView, nullptr);
790 if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
791 bd->pd3dDeviceContext->ClearRenderTargetView(vd->RTView, (float*)&clear_color);
792 ImGui_ImplDX11_RenderDrawData(draw_data: viewport->DrawData);
793}
794
795static void ImGui_ImplDX11_SwapBuffers(ImGuiViewport* viewport, void*)
796{
797 ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData;
798 vd->SwapChain->Present(0, 0); // Present without vsync
799}
800
801static void ImGui_ImplDX11_InitMultiViewportSupport()
802{
803 ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
804 platform_io.Renderer_CreateWindow = ImGui_ImplDX11_CreateWindow;
805 platform_io.Renderer_DestroyWindow = ImGui_ImplDX11_DestroyWindow;
806 platform_io.Renderer_SetWindowSize = ImGui_ImplDX11_SetWindowSize;
807 platform_io.Renderer_RenderWindow = ImGui_ImplDX11_RenderWindow;
808 platform_io.Renderer_SwapBuffers = ImGui_ImplDX11_SwapBuffers;
809
810 // Default swapchain format
811 DXGI_SWAP_CHAIN_DESC sd;
812 ZeroMemory(&sd, sizeof(sd));
813 sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
814 sd.SampleDesc.Count = 1;
815 sd.SampleDesc.Quality = 0;
816 sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
817 sd.BufferCount = 1;
818 sd.Windowed = TRUE;
819 sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
820 sd.Flags = 0;
821 ImGui_ImplDX11_SetSwapChainDescs(desc_templates: &sd, desc_templates_count: 1);
822}
823
824static void ImGui_ImplDX11_ShutdownMultiViewportSupport()
825{
826 ImGui::DestroyPlatformWindows();
827}
828
829//-----------------------------------------------------------------------------
830
831#endif // #ifndef IMGUI_DISABLE
832

source code of imgui/backends/imgui_impl_dx11.cpp