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That wouldn't be too hard if GPU's would have a stable interface. Try programming a GPU in Assembly language and see how that goes. The experience sucks, but that's the level that needs to be targeted in case of an OS.

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For example, in the past Amiga computers had a 'GPU' (although much less powerful than todays GPUs) with a stable interface. It was a first class citizen in its OS. It also was incredibly easy to target in Assembly language.

Blitter was great, but those were simpler times.

The best we have nowadays is using compute shaders for the same purpose.

Just like when using a TMS34010 with its C SDK.

Amiga died because it was stuck with the same old "GPU" for too long, among other reasons.

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