wyatt8740
commented
1 year ago Am I correct in stating that #851 did not add this feature - i.e., that it still needs adding?
Sorry for the bump.
Probably still not able to add it myself but I'm looking into it again to see if I can understand the code better this time. My ancient laptop would really get a lot of use out of such a feature!
Would the code that does something similar in compiz be of any use at all for a beginner?
Environment
FVWM3
Expected behavior
I would like a way to specify or load a texture, either from a file or an array/encoded string, such that I can implement a lookup table for color correction in Picom (and thus get color correction across the entire desktop for free).
Alternately, it would be great if a 3D lookup table were a feature, such that the user could provide an image file with their lookup table texture and have picom automatically do the rest of the work. I think the only X compositor that has color correction right now is Compiz - though Mac OS has it natively in its compositor.
Current Behavior
Currently, i can write GLSL fragment shaders, and with some slight hacking even vertex shaders (there's code for it, but no command line argument exposes the feature). However, I cannot load a texture into memory, as is required for a lookup table. Sampler2D textures would be good enough, since you can just tile every layer of the cube next to each other in a 2D space. In fact, that's how an existing implementation of the shader I want to recreate does it in retroarch.