You'll have to install the following C libraries:
Then, make sure you have gcc installed and run make
Once compiled, you can use GLWall like this:
./GLWall <path_to_shader> for shaders in regular_shaders/
./GLWall <path_to_shader> <path_to_texture> for shaders in textured_shaders/, where the texture path leads to an image file (I've tested jpegs and pngs)
This will render the given shader to a window with the settings specified in config.h
To use as a wallpaper, you can use xwinwrap or whatever window manager dependant trickery you want lol
The shader rendering can be paused with pkill -SIGUSR1 GLWall and unpaused with pkill -SIGUSR2 GLWall so you can bind that to whatever works with your system (it's advisable to pause rendering when anything is in fullscreen mode or when playing a game in general)