@tk those are two different concepts.
An application can't arbitrarily become drm master and control the output (there are some exceptions for VR stuff, but it's not common). This is the reason why tabbing out of fullscreen games is seemless on linux but is a crashy mess on windows.
But you can of course still do accelerated rendering with OpenGL. If done right, even zero-copy with direct scanout and proper frame timing.
Going through XWayland will add a few roundtrips to that.
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