Hi. I'm about to download the latest versions of MESSUI and MAMEUIFX and I need some help trying to set up GLSL, at least for the former. While it's fairly easy to set it up in MAMEUIFX, I for the life of me can't figure out how to set it up for MESSUI and other variants of MAME, at least in the INI. When I tried, I usually get this error (see image)
I also can't figure out how to get pixel-perfect scaling for when I don't want the shaders & bi-linear filtering enabled.