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Roland Scheidegger authored
d3d10 actually requires using provoking (first) vertex. GL is happy with any vertex (as long as we say it's undefined in the corresponding queries). Up to now we actually used vertex 0 for viewport index, and vertex 1 for layer (for tris), which really didn't make sense (probably a typo). Also,$ since we reorder vertices of clockwise triangle, that actually meant we used a different vertex depending if the traingle was cw or ccw (still ok by gl). However, it should be consistent with what draw (clip) does, and using provoking vertex seems like the sensible choice (draw clip will be fixed next as it is totally broken there). While here, also use the correct viewport always even when not needed in setup (we pass it down to jit fragment shader it might be needed there for getting correct near/far depth values). No piglit changes. Reviewed-by: Brian Paul <brianp@vmware.com> Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
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