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Step 5: Add Vlad Vukićević's WebGL helpers for rotation.
The code in listing 9.17 comes from Mozilla's site at . Mozilla tells us
that “these routines were borrowed from a sample previously written by Vlad Vukićević,”
whose blog you can find at . Vlad has created a couple of tools to help
with rotation and with pushing and popping data. Append his rotation logic to gd.core
with the following code.
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