Hands-On Graphics Without X11
https://blogsystem5.substack.com/p/netbsd-graphics-wo-x11loading story #42743096
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Very nice, I am very interested in raw framebuffer graphics and applications.
Check this out: https://github.com/vvaltchev/tfblib
It worked well for a hobby project. I had issues on certain specific displays I think due to the color depth requirement.