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Backends: Rework blending equation to preserve alpha in output buffer accross all backends. (#2693, #2764, #2766, #2873, #3447, #3813, #3816)
Some of the viewport ideas from #2766 are not in there yet (e.g. Vulkan: setting compositeAlpha based on cap.supportedCompositeAlpha)
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@ -11,6 +11,7 @@
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// CHANGELOG
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// (minor and older changes stripped away, please see git history for details)
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// 2021-02-18: DirectX10: Change blending equation to preserve alpha in output buffer.
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// 2019-07-21: DirectX10: Backup, clear and restore Geometry Shader is any is bound when calling ImGui_ImplDX10_RenderDrawData().
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// 2019-05-29: DirectX10: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
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// 2019-04-30: DirectX10: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
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@ -439,8 +440,8 @@ bool ImGui_ImplDX10_CreateDeviceObjects()
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desc.SrcBlend = D3D10_BLEND_SRC_ALPHA;
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desc.DestBlend = D3D10_BLEND_INV_SRC_ALPHA;
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desc.BlendOp = D3D10_BLEND_OP_ADD;
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desc.SrcBlendAlpha = D3D10_BLEND_INV_SRC_ALPHA;
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desc.DestBlendAlpha = D3D10_BLEND_ZERO;
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desc.SrcBlendAlpha = D3D10_BLEND_ONE;
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desc.DestBlendAlpha = D3D10_BLEND_INV_SRC_ALPHA;
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desc.BlendOpAlpha = D3D10_BLEND_OP_ADD;
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desc.RenderTargetWriteMask[0] = D3D10_COLOR_WRITE_ENABLE_ALL;
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g_pd3dDevice->CreateBlendState(&desc, &g_pBlendState);
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