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Kenneth Graunke authored
When considering color write masks, we often want to know whether an RGBA component actually contains any meaningful data. This function provides an easy way to answer that question, and handles luminance, intensity, and alpha formats correctly. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Brian Paul <brianp@vmware.com> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Tested-by: Dylan Baker <baker.dylan.c@gmail.com>
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