HLSL and GLSL Reference
Here is a page where you can access the reference documentation for HLSL and GLSL.
HLSL
HLSL is the DirectX Language for Shaders.
- HLSL Reference (Microsoft) : Main documentation
- HLSL Cheat Sheet Home made cheat sheet with shortform information.
GLSL
GLSL is the OpenGL/Vulkan Language for Shaders