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> xanalogTV and the like run CRT effects even under an Athlon 2000 back in the day

Because it wasn't doing much else.

> even under legacy systems with no OpenGL support at all

If it's as legacy as all that, it probably doesn't have graphics that are particularly enjoyable to use. Are you trying to run it on a Sun IPX or something?

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Considering that MAME's shaders run fine on a 2011-era laptop with the positively primitive Intel iGPU of the Sandy Bridge era, I can only assume they're intending to run this on something extremely ancient that would end up being less power efficient for the task.

Even a Raspberry Pi can handle this stuff at low power consumption today.

> I can only assume they're intending to run this on something extremely ancient that would end up being less power efficient for the task.

I don't think I've owned anything PC-like that didn't have hardware OpenGL acceleration since the late 90s.

CRT simulation didn't run well on Intel iGPUs for a very long time. While they could run the effects, they couldn't run them fast enough. There was longstanding advice in the emulation scene to not bother using shaders unless you had a dGPU; that only changed around Sandy Bridge, where the performance became sufficient.

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