the SWZ opcode is not handled correctly in mesa's tnl module (in t_vb_arbprogram.c). The results are more or less obvious wrong (for instance use the swz2.txt test case but use only x/y/z/w and not 0/1), but I can't quite see how it's supposed to work. It seems strange that in fact somtimes 3 RSW instructions are generated for a single SWZ, I'd think 2 should be sufficient. Anyway, it just plain doesn't work.
sorry for that double entry accident
Mass version move, cvs -> git
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