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d3d11screencapturesrc: Fix mouse cursor blending

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Ignore alpha component of source (mouse cursor texture)
when blending alpha channel, otherwise the background area of source
(which has zeros) will be written to render target. Then it will result
in black rectangle if output texture is converted to premultiplied alpha
texture

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5566>
This commit is contained in:
Seungha Yang 2023-10-28 01:23:36 +09:00 committed by GStreamer Marge Bot
parent 6f62b24788
commit bdc0f177f0
1 changed files with 2 additions and 2 deletions
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4
subprojects/gst-plugins-bad/sys/d3d11/gstd3d11screencapturesrc.cpp
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@ -907,8 +907,8 @@ gst_d3d11_screen_capture_prepare_shader (GstD3D11ScreenCaptureSrc * self)
blend_desc.RenderTarget[0].SrcBlend = D3D11_BLEND_SRC_ALPHA;
blend_desc.RenderTarget[0].DestBlend = D3D11_BLEND_INV_SRC_ALPHA;
blend_desc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
blend_desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ONE;
blend_desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ZERO;
blend_desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ZERO;
blend_desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ONE;
blend_desc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
blend_desc.RenderTarget[0].RenderTargetWriteMask =
D3D11_COLOR_WRITE_ENABLE_ALL;