Is it possible to use custom shaders within PPSSPP

[LunaMoo]

Yeah PPSSPP does support custom shaders, however we only support them in OpenGL/GLES with buffered rendering. We use GLSL, so you can't use CG shaders as the one you want without converting them first, through while not exactly the same, you might try Nick001 scanline shader instead since it might look similar if not same after some tweaks to what you want.

All you have to do to add new shaders made by others is to extract the shader files along ini file into "ppsspp\assets\shaders\" folder and restart ppsspp. You can also often easily tweak some shaders by editing fsh files as well, kind of whole point of custom shaders is the fact that everyone likes different things so some of us add parameters and lots of comments inside to make changing effects easy.