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Performance Enhancements
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Set Pixel Zoom to 1.0
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Disable Fragment operations (Chapter 10)
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Disable T&L
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Reduce the amount of data conversion to/from the framebuffer
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Unsigned image formats may
be faster than unsigned
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Large pixel rectangle operations are generally faster
than several small operations
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Reduce the amount of data to transfer (use GL_UNSIGNED_BYTE
if possible)
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Pixel transfer operations (scale/bias, offset) do have a
performance cost - use only if necessary
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