Oh crikey, there's an open-source FPGA implementation of the Voodoo1 - https://github.com/fayalalebrun/SpinalVoodoo
GitHub - fayalalebrun/SpinalVoodoo: SpinalHDL implementation of the 3dfx Voodoo Graphics GPU

SpinalHDL implementation of the 3dfx Voodoo Graphics GPU - fayalalebrun/SpinalVoodoo

GitHub
@rasteri Finally! I was wondering if somebody was working on this and googled for this on a regular basis, but couldn't find anything so far.