DirectX/OpenGL support

Is this answer from 2013 still correct?

Can I run applications, like games, which require hardware acceleration?

See also: Is Qubes viable for gaming? and many more threads.

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So OpenGL is only supported in dom0?

In Qubes 4.0, yes. In Qubes 4.1 it’s sys-gui. See also: Need help setting up sys-gui and NVIDIA.

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How about developing applications with 2D/3D interfaces within qubes?
Not quite sure if GPU acceleration is needed for that.

not always, sometime needed for faster rendering there thing