Add CUT upscaling shaders. #509
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Hi! I've been working on porting CUT to libretro, starting with the glsl-shaders.
These are basically lightweight upscaling algorithms designed to support a wide variety of games, from 8bit up until more modern ones with antialiasing.
The different versions have tradeoffs between performances and quality, with CUT3 being the best looking and CUT1 the fastest (although all of them run at 60Hz even on low end hardware such as the nvidia shield).
You can check out the original source code with a bit more details here and see them in action on a bunch of different games here.
Feel free to let me know if you'd like to change anything on the PR, and don't hesitate to tag me if any issues come up!