Shader and advanced post processing documentation https://docs.godotengine.org/en/stable/tutorials/shaders/screen-reading_shaders.html https://docs.godotengine.org/en/stable/tutorials/shaders/advanced_postprocessing.html
Hash function source (probably) (I forgot) https://thebookofshaders.com/10/
Saturation, contrast, and brightness sources http://www.davetech.co.uk/shaderdesaturate https://stackoverflow.com/questions/944713/help-with-pixel-shader-effect-for-brightness-and-contrast
Noise functions are from The Book of Shaders https://thebookofshaders.com/11/ https://thebookofshaders.com/edit.php#11/2d-gnoise.frag