[Mesa-dev] [PATCH] i965: fix mask used to write to clip distance registers when gen>6

[Eric Anholt]

On Sun, 12 Jun 2011 21:14:50 -0700, Paul Berry <stereotype441 at gmail.com> wrote:
> 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.

Reviewed-by: Eric Anholt <eric at anholt.net>

Is this caught by any new testcase?  It's not a requirement, just
thinking that since you were building testcases like this recently, it
might be easy.
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