Add DirectComposition for DX12 backend (for transparency) #7462
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Note that the demo window has its window background disabled.
DirectComposition can be used to draw windows with transparent content that blend in via the desktop compositor. This PR aims to add transparency support for viewport windows using that.
DCOMPhas to be#defined to check this PR in action.Only DX12 backend has been modified to support DirectComposition, since while DX11 also supports using DC-provided swap chains, DX11 is supported on Windows 7 whereas DC is available starting from Windows 8, and I wanted to make the amount of code added minimal by omitting code that checks for supported features.
Related PR: #2766
I thought that having
ImGuiBackendFlags_RendererHasTransparentViewportsset from backend implementation would work better than a user settingImGuiConfigFlags_TransparentBackbuffersmanually as needed, as it probably is more of a backend capability rather than a user-configurable thing.