And what I found:
Mesa 21.0 is now working with Haiku for software OpenGL rendering β OSnews
So we have OpenGL available now, and it is possible to recompile QT for it.
Which means that portability from the graphics side is probably not much of a problem.
OpenGL is available since long on Haiku, but it is not that simple. Somebody have to implement support for OpenGL contexts in Qt. At least thats what 3DEyes told last time AFAIR.
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