Does anyone know a way to flip the video output horizontally? I didn't see a setting for it, but I figured, if I can (and flip the control input as well), it'd freshen up old games and give them a bit more replay value, since all the levels would be mirrored.
The easiest way I can think of would probably be to write a shader and flip all of the pixels individually. Dolphin uses Nvidia's Cg for that sort of post-processing.
Thanks Shonumi. I found the shaders under ./User/Shaders. It's a pretty long list. Do I need to backup and edit all of these?
Nevermind, I figured it out. I wasn't using OpenGL (and you can't use the custom shaders w/o OpenGL).