ref: 6b71bf694a9fa2e694f3e70a2067e0021b2c2f07
parent: e0baf147d655409b721e41b0e3effabd39a96b34
author: rodri <rgl@antares-labs.eu>
date: Sat Mar 2 19:40:51 EST 2024
add user-defined vertex attributes (varyings) and improve the interpolation code.