Book of Shaders

The Book of Shaders is Patricio Gonzalez Vivo and Jen Lowe's free online book on fragment shaders, translated into more than a dozen languages, that teaches GLSL through live, editable examples on every page. Chapters move from shaping functions, colour and shapes through random, noise, cellular noise and fractals, then on to image processing, simulations such as reaction diffusion, and 3D techniques like ray marching. It is the usual starting point for designers and developers who want to understand shaders rather than copy them.