ref: 6477319da461ad78a120a3c777228eaa8194c9f8
parent: 3857a7ad606f4f050411d27fc94116731fddb1b3
author: rodri <rgl@antares-labs.eu>
date: Mon Jun 29 14:28:02 EDT 2020
bring flat triangle rasterization back, with some goodies for future shading work. add uv coordinates to the vertex.