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When drawing quads using triangles we need to be careful to make the provoking vertices match when flat shading. v2: Major rebase on top of Ian's other t_dd_dmatmp.h work. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>