MAME artwork crop

I’d like to tell the current MAME core to crop artwork, but I’m not sure what the best way to do that is. Also, I’m wondering if it’s possible for shaders to effect only the play area and not the artwork, but I have a feeling it isn’t. Thanks!

No way for the shaders. However, if you’re using *.lay artwork for borders, etc., you can load them via the ‘video layout’ option in RetroArch (only works with GL driver currently) and then shaders will only apply to the game image.

I’m not sure what you’re asking on the cropping bit.

I’m using the latest set of mame roms, and the mame artwork set. The default behavior of vanilla mame is to zoom out so the game is inset in a small window. In vanilla mame this is easily changed via the mame ui, but changing this setting doesn’t seem to take effect in the retroarch core.