RetroArch: Example of arcade overlays/bezels and shaders running on a Pi.
You can see in this video how arcade game overlays/bezels can look with shaders. The examples in the video are running on RetroPie on a Raspberry Pi 3.
The bezels fill in the black space usually left over, but are also an authentic graphic of the original arcade machine.
It uses much less CPU if you disable the curvature effect I have in the video.
More details here:
https://www.youtube.com/watch?v=SCqQ7ciCHcI
Credits to:
davej for the shader
https://forums.libretro.com/t/raspberry-pi-friendly-crt-shader/3937
John.Merrit for the overlays
https://forums.libretro.com/t/arcade-overlays/4084
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