I’m working on porting these shaders. SuperRes is a kind of a sharpen shader which works in a recursively way. It’s a bit tricky to use, so I made a special preset (.cgp) and put it inside Sharpen folder in common-shaders: https://github.com/libretro/common-shaders/blob/master/sharpen/super-xbr-super-res.cgp
The shaders are there too. Some screenshots from SuperXbr using SuperRes to improve sharpness and deposterize to clean noise a bit: