Backends: DirectX10, DirectX11: fixed a crash when backing/restoring state if nothing is bound when entering the rendering function. (#4045)

backends/imgui_impl_dx10.cpp

@@ -190,7 +190,7 @@ void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
         DXGI_FORMAT                 IndexBufferFormat;
         ID3D10InputLayout*          InputLayout;
     };
-    BACKUP_DX10_STATE old;
+    BACKUP_DX10_STATE old = {};
     old.ScissorRectsCount = old.ViewportsCount = D3D10_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE;
     ctx->RSGetScissorRects(&old.ScissorRectsCount, old.ScissorRects);
     ctx->RSGetViewports(&old.ViewportsCount, old.Viewports);

backends/imgui_impl_dx11.cpp

@@ -198,7 +198,7 @@ void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
         DXGI_FORMAT                 IndexBufferFormat;
         ID3D11InputLayout*          InputLayout;
     };
-    BACKUP_DX11_STATE old;
+    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);

docs/CHANGELOG.txt

@@ -60,6 +60,8 @@ Other Changes:
   [@1025798851]
 - Backends: DirectX9: calling IDirect3DStateBlock9::Capture() after CreateStateBlock() which appears to
   workaround/fix state restoring issues. Unknown exactly why so, but bit of a cargo-cult fix. (#3857)
+- Backends: DirectX10, DirectX11: fixed a crash when backing/restoring state if nothing is bound when
+  entering the rendering function. (#4045) [@Nemirtingas]
 - Backends: Vulkan: Fix mapped memory Vulkan validation error when buffer sizes are not multiple of
   VkPhysicalDeviceLimits::nonCoherentAtomSize. (#3957) [@AgentX1994]
 - Backends: OpenGL3: Don't try to read GL_CLIP_ORIGIN unless we're OpenGL 4.5. (#3998, #2366, #2186) [@s7jones]