Use direct composition for d3d12 backend #99387
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Should be good to merge after @AThousandShips' suggestion is rebased
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This PR fixes #95630 and can be seen as a partial fix for #76167.
Update D3D12 Renderer to Use Direct Composition
This commit updates the D3D12 renderer to use
CreateSwapChainForCompositioninstead ofCreateSwapChainForHwnd, addressing the lack of alpha support in the latter (see #95630).Switching to direct composition is supposed to have additional benefits according to the Microsoft documentation and other online resources. Specifically, it eliminates the need to transfer the final image to the CPU for DWM composition, which is suggested to improve performance. While I have not empirically verified these performance claims, the explanation aligns with my own research into transparency issues and DWM behavior.
Compatibility Notes
This change requires Windows 8 or later. However, since D3D12 is unsupported on Windows 7 (now EOL for nearly five years), this should not pose a compatibility issue.