> MAME emulates everything on CPU.
Except for HLSL and vectors and the on-screen UI and artwork/overlays and scaling the screen up from 320x240 to fit your monitor and a few other things.
The correct answer is "MAME currently submits everything to the GPU in approximately the worst possible way, so we are in no danger of touching the performance limits of conventional APIs, let alone exotic ones". (This also applies to third-party forks like Retroarch's version of MAME).
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