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I'm only about half way through the book and the only custom library I've seen them use so far is an EAGL wrapper. You can ignore it though...
I've been considering getting the GLSL book. Is the GLSL version used in the book drastically different from the version that ES 2.0 supports or...
I'm also slogging through the 1.1 -> 2.0 transition. The two books that I've been reading through are the iPhone 3D programming book mentioned...