Custom PPSSPP shaders

[guest.r]

Yep, the 5xBR shaders have some trouble doing everything right in the PSP environment. I wouldn't bother too much about it. If you play some 2D ports and xBRZ is doing some quirky stuff then they might be OK to use.

To change the subject, after some testing i decided to update the shaders to render in output resolution so they should run really fast at even the highest internal resolutions (luckily no quality issues/changes here). They went too slow for my taste, especially the "filtro" version. Matters a great deal if someone is using an Intel renderer, for example.

So, bump up the rendering resolution...