llvmpipe: minor comment update
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@@ -131,7 +131,7 @@ static void perspective_coef( struct lp_rast_triangle *tri,
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/**
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* Special coefficient setup for gl_FragCoord.
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* X and Y are trivial, though Y has to be inverted for OpenGL.
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* X and Y are trivial
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* Z and W are copied from position_coef which should have already been computed.
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* We could do a bit less work if we'd examine gl_FragCoord's swizzle mask.
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*/
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