GLSL/HLSL Shading programming

HLSL

Programming guide for HLSL - Win32 appsdocsmsft

SHADERed - Free and open source shader editor

HLSL Tutorials

40 video tutorials that teach 3d artists how to write real-time shaders in HLSL. This series starts with the basics of shader programming so that artists with no experience can learn the fundamentals. It then covers more advanced topics such as lighting models, global illumination, reflections, fresnel, offset mapping, vertex animation, etc.

Shadertoy BETA

FX ComposerNVIDIA Developer

GLSL

Tutorial 8 : Basic shading

LearnOpenGL - Shaders

A Beginner's Guide to Coding Graphics ShadersGame Development Envato Tuts+