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by jsheard 4133 days ago
There's not much hard information on how Apple deals with graphics drivers, but from what I gather they use a unified in-house OpenGL frontend for the hardware-independent layer, then defer to a modified version of the vendors driver for the low-level stuff.

Their frontend only implements up to GL 4.1, so even if the vendors were to release drivers independently there would be no way for an app to access the newer functionality through the OS X frameworks.