I’ve been messing around with creating a custom overlay. Found a couple of videos online and followed the tutorials to make a simple one, using a preinstalled one as a guideline for the edges. Made the cfg file, put the png and cfg into the overlay folder…and nothing. When I tried using it on my snes core, it failed. But when I did it with the n64 core, it didn’t show anything. Just treated it as black bars on the sides. It still shows the game, so I don’t think it’s the png. I compared the cfg file as well and it’s the same setup as the others.
Cores used: Mupen64Plus-Next, SNES9x
Image creation: GIMP