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Why should be Windows or Mac support a concern for Wayland compositors? DWM or Quartz authors don't care about Linux either.

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To be fair, X (VcXsrv) works on Windows and (XQuartz) pre-M1 macOS.

And Windows apparently has a Wayland compositor for WSL

They use RDP RAIL (RDP-for-a-single-window) on top of Weston, and then the resulting surfaces are managed by the DWM.

Which is actually an interesting approach; linux native compositors should "steal" that idea and implement it too. It could lead to RemoteApp-alike for Linux.

ChromeOS transports Wayland over virtio so windows opened from virtual machines are seamlessly part of the main desktop.

Waypipe proxies Wayland over SSH etc: https://gitlab.freedesktop.org/mstoeckl/waypipe/

They do, yes. Nobody will prevent anyone trying to port Wayland compositors, either. If that's your itch, feel free to go for it.

But the Wayland compositor authors will steer their software to run effectively on Linux. If that means it is difficult to port to Windows or Mac (whether because they miss dma-buf, or demand something that the native platform won't provide to non-system process), so be it.

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