GLSL Gotchas

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mattdesl edited this page Feb 22, 2013 · 11 revisions

There are some gotchas to be aware of when working with GLSL on various platforms.

Mac OSX

Array declaration is broken on Snow Leopard (source)

ES (Android, iOS, WebGL)

Be mindful of step() as it may create branching (although it really shouldn't). Benchmark with smoothstep() to see if performance improves.
Ternary operator may not be supported on certain Android devices[1]
'For' loops may cause problems on certain Android devices[1]