Shader Language Collection

Core Image Kernel Language

https://developer.apple.com/library/content/documentation/GraphicsImaging/Reference/CIKernelLangRef/ci_gslang_ext.html#//apple_ref/doc/uid/TP40004397-CH206-BCIECEBI

OpenGL Shader Language

https://www.khronos.org/registry/OpenGL/index_gl.php/

Metal Shading Language Specification

https://developer.apple.com/metal/Metal-Shading-Language-Specification.pdf

Core Image Programming Guide

https://developer.apple.com/library/content/documentation/GraphicsImaging/Conceptual/CoreImaging/ci_intro/ci_intro.html#//apple_ref/doc/uid/TP30001185-CH1-TPXREF101