You can download the Voodoo 2 programming manual which is only around 250-something pages long. The Voodoo2 was fixed function; you loaded assets into the voodoo memory then called functions to operate on those assets. The driver takes care of those two roles by loading and managing the assets in the voodoo memory and an API to program the registers on the card to execute functions on the loaded assets. There were more steps involved with geometry processing which happened in the driver but I am unsure if those were handled in user space by the libraries the application called or the driver code itself.

This isn't 250 something pages, only 132 so maybe I was wrong, but its a good look into how the Voodoo2 worked: https://www.dosdays.co.uk/media/3dfx/voodoo2.pdf

See also: https://3dfxarchive.com/reference.htm

A fun tidbit is the voodoo2 has a 2D mode but was not VESA compliant so it could not be used in a PC without being tied to a VESA card for 2D graphics. I believe that ability was there for custom and non-pc platforms.

Thanks a lot! I'll take a look. It's really a treasure trove. But I probably need to purchase some Voodoo card to do real work on it.

Thanks, that’s interesting. I never owned a Voodoo card but I was definitely drooling over it when I saw a demo machine running Unreal on it.

And the second link definitely has everything one needs to do everything with those cards.