It does this by enforcing mipmapping and minification filters, and
always autogenerates mipmaps and enforces anisotropic filtering for all
modes (if that's separately enabled).
This looks nice and flicker free in most games without any additional
tweaking, including GTA and Burnout which have long been painfully
flickery in the distance due to undersampling.
Needs a bit more testing before merge, maybe.
Fixes#13888