Hi, MAME is able to use screen overlay effects like those: http://www.mameworld.info/ubbthreads/showflat.php?Cat=&Number=92158&page=0&view=expanded&sb=5&o=&fpart=1&vc=1&new=#Post92158 I’ve found them in FBA standalone too, in D3D7 blitter, labeled as “RGB effects”. Pictured below is the “MAME rgbmicro” effect, that seems to be some kind of an aperture grille effect.
I’d be very happy to see these effects implemented as shaders for RetroArch.
PhosphorLUT can already implement similar overlays.
You can already use them (with some modification) through the overlay system–the same one used for touchscreen controls in the mobile ports. There’s some discussion about it toward the end of this thread: http://forum.themaister.net/viewtopic.php?id=239&p=2