There, that's more like it. GPU-accelerated texture conversion via the BGFX rendering backend in MAME. Saves about 5-10% of CPU time depending on the game!pic.twitter.com/rE53SXILNY
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With all of the other rendering backends, we do a line-by-line copy+convert of the guest texture data to host texture, but with BGFX it now just does a bulk copy and handles conversion via an additional fullscreen pass.
Perhaps more interesting, it's smart enough to patch up whatever 'screen chain' definition (essentially a stack of full-screen passes) to do the initial texture conversion, so I didn't have to deprecate the existing JSON definitions for fullscreen effects.
