[jsheard]

Doesn't the UEFI firmware map a GPU framebuffer into the main address space "for free" so you can easily poke raw pixels over the bus? Then again the UEFI FB is only single-buffered, so if you rely on that in lieu of full-fat GPU drivers then you'd probably want to layer some CPU framebuffers on top anyway.

[throwaway173738]

Yes if you have UEFI.

[the8472]

well, if you poke framebuffer pixels directly you might as well do scanline racing.

[jsheard]

Alas, I don't think UEFI exposes vblank/hblank interrupts so you'd just have to YOLO the timing.