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Backends: DirectX12: Fixed an issue in synchronization logic improving rendering throughput for secondary viewports. (#9025, #8961)

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This commit is contained in:
Rémy Tassoux
2025-10-20 19:00:31 +02:00
committed by ocornut
parent a47064966b
commit 05531f898e
2 changed files with 8 additions and 4 deletions
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4
backends/imgui_impl_dx12.cpp
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@@ -23,6 +23,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2025-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
// 2025-10-23: [Docking] DirectX12: Fixed an issue in synchronization logic improving rendering throughput for secondary viewports. (#8961, #9025)
// 2025-10-11: DirectX12: Reuse texture upload buffer and grow it only when necessary. (#9002)
// 2025-09-29: DirectX12: Rework synchronization logic. (#8961)
// 2025-09-29: DirectX12: Enable swapchain tearing to eliminate viewports framerate throttling. (#8965)
@@ -294,8 +295,8 @@ void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandL
// FIXME: We are assuming that this only gets called once per frame!
ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)draw_data->OwnerViewport->RendererUserData;
vd->FrameIndex++;
ImGui_ImplDX12_RenderBuffers* fr = &vd->FrameRenderBuffers[vd->FrameIndex % bd->numFramesInFlight];
vd->FrameIndex++;
// Create and grow vertex/index buffers if needed
if (fr->VertexBuffer == nullptr || fr->VertexBufferSize < draw_data->TotalVtxCount)
@@ -1280,7 +1281,6 @@ static void ImGui_ImplDX12_SwapBuffers(ImGuiViewport* viewport, void*)
ImGui_ImplDX12_ViewportData* vd = (ImGui_ImplDX12_ViewportData*)viewport->RendererUserData;
vd->SwapChain->Present(0, bd->tearingSupport ? DXGI_PRESENT_ALLOW_TEARING : 0);
vd->FrameIndex++;
}
void ImGui_ImplDX12_InitMultiViewportSupport()

8
docs/CHANGELOG.txt
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@@ -63,8 +63,12 @@ Other Changes:
Docking+Viewports Branch:
- Examples: SDL2+DX11, SDL3+DX11, Win32+DX10, Win32+DX11: fixed one resource
leak from the use of MakeWindowAssociation() in 1.92.4. (#9010, #4350) [@o-3-o]
- Examples:
- SDL2+DX11, SDL3+DX11, Win32+DX10, Win32+DX11: fixed one resource leak
from the use of MakeWindowAssociation() in 1.92.4. (#9010, #4350) [@o-3-o]
- Backends:
- DirectX12: Fixed an issue in synchronization logic improving rendering
throughput for secondary viewports. (#9025, #8961)
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