Is there a book about algorithms used in shader

[wangjiangchuan]

I find that every shader has algorithms in it, especially some complex shader. Such perlin noise, ray-marching and fbm are hard to find clear and useful articles for me to understand. So is there a book that clearly explaining some basic algorithms used in shader? Or is there any book for a new bird to begin his shader journey?

[mrdoob]

A lot of the stuff comes from http://www.iquilezles.org/www/index.htm.