Shaders are cool. You can do all sorts of interesting things with them: this and previous ShaderX books are full of examples. Alongside their power, however, programmable shaders can lead to an explosion of permutations: my last Xbox game contained 89 different pixel shaders, and my current project already has far more. Many of these shaders are variations on a few basic themes, for instance level-of-detail approximations of a material, or the same lighting model both with and without animation skinning. The total number of combinations is huge and is increasing all the time. Typing everything out by hand would be time consuming, error prone, and a maintenance nightmare.
This article will describe how to automatically generate large numbers of shader permutations from a smaller set of handwritten input fragments.
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