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Kenneth Graunke authored
This was added in September 2013 when we first implemented the fast (but lower quality) derivatives. A quick Google search didn't turn up anyone using or recommending the option, so I suspect no one does. Applications that want to control the quality of their derivatives can use the new GL_ARB_derivative_control extension, or use the glHint mechanism. The driconf option seems superfluous. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Matt Turner <mattst88@gmail.com>
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