Thanks to some help from maister, I ported cgwg’s LCD shader to Cg. It looks like this (along with motion blur, which doesn’t show up well in screenshots):
I’ll get it added to libretro’s common-shaders repo soon, but in the meantime, you can download it here:
https://s3.amazonaws.com/Emulation/Pixel+Shaders/LCD-cgwg.zip
This shader lcg-cgwg.cgp doesn’t work anymore since ~RA 1.2 in cg. I also tried the latest nightly 15th july but it’s still broken. The list of passes stays at 0. Any other shader I tried (crt-royal, hand gb-shader, lcd-shader…) works fine.
When downloading GLSL shaders with online updater, the lcg-cgwg.glslp works fine, but I would like to see the cg working again 
The cg version worked fine with RA 1.1 (Nightly versions).
Should be fixed now. Thanks for the heads-up (just to clarify: it was the cgp pointing to the wrong place since we shuffled things around)
I also found out, that there is something weird in the cgp itself ^^ Thanks for the quick reaction