Originally Posted By SoltanGris42
Ok, I took a shot at it.

Thanks! It's hard to debug this sort of thing on Linux.
I also added in a magenta/green striped aperture mask just because I thought it was a standard feature in most crt-geom versions floating around the internet. And I added a slider to turn off the effect. I hope cgwg doesn't mind...

The main reason I never included this in the MAME version is that the same functionality was available using the -effect overlays.

I've created a new version that does a similar thing using textures loaded from files, and I've created a bunch of suitable images. Note that these are all designed for displays with RGB subpixel order, so they won't behave that well under rotation. It's available here, again in uncompiled form.