For Sauraen's video on F3DEX3 specular lighting and Fresnel.
This repository does not contain any code or assets copyrighted by Nintendo.
All content was created by Sauraen and is dedicated to the public domain,
except for grate_main.i4.png and grate_env.rgba16.png which are Copyright
(C) 2022 Ilya Kostylev, from here.