cyan

Thanks for feedback @Zombeaver ! I was using Genesis's Picodrive core, and switched to Genesis Plus GX, since you mentioned it should work with this core. Unfortunately, no *.cgp shader get listed yet ... Video driver setting is set to `gl`. The video card is an NVidia RTX2080, so I expect it to be compatible with Cg. However, it's more the software environment which worries me. Since it's a Linux workstation, there are many parts which can be "customized" by the distribution. I'm using a stock Ubuntu 19.10, with as little modifications as possible. Still, anything could happen on this front ...

For some reason, I'm unable to get the Zombie's shaders listed on retroarch. They are present, in the right directory, but the UI only lists the *.glsl files, not *.cgp ones. I have not found a solution yet. PS : my installed version of RetroArch is very recent (v1.8.1), it's installed via Ubuntu Snap PS2 : according to this doc : https://www.retroarch.com/?page=shaders , > CG: Old, deprecated format. Might not be available if RetroArch is built without Cg runtime support. There is also : https://www.libretro.com/index.php/tag/cg/ > GLSL shaders now preferred over Cg when possible