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i965: fix mask used to write to clip distance registers when gen>6

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In gen6 and above, clip distances 0-3 are written to message register
3's xyzw components, and 4-7 to message register 4's xyzw components.
Therefore when when writing the clip distances we need to examine the
lower 2 bits of the clip distance index to see which component to
write to.

emit_vertex_write() was examining the lower 3 bits, causing clip
distances 4-7 not to be written correctly.

Fixes piglit test vs-clip-vertex-01.shader_test
This commit is contained in:
Paul Berry 2011-06-12 10:47:46 -07:00
parent 3acae45915
commit 95c2e0b601
1 changed files with 1 additions and 1 deletions
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src/mesa/drivers/dri/i965/brw_vs_emit.c
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@ -1635,7 +1635,7 @@ static void emit_vertex_write( struct brw_vs_compile *c)
else
m = brw_message_reg(4);
brw_DP4(p, brw_writemask(m, (1 << (i & 7))),pos, c->userplane[i]);
brw_DP4(p, brw_writemask(m, (1 << (i & 3))),pos, c->userplane[i]);
}
}
} else if ((c->prog_data.outputs_written &