[Bug 102855] [OpenGL CTS] Multiple crashes in enhanced layout tests due to incorrect vue setup

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102855

--- Comment #1 from Kenneth Graunke <kenneth at whitecape.org> ---
The problem seems to be that FS inputs / SF outputs go beyond 32, which is the
limit imposed by the SF attribute index.

I think we can use URB Entry Read Offset to work around this...currently we
hardcode it to 0 or 1...but we could probably skip over a few more.  In
particular, we have clip distance in the VUE slots, but the FS shouldn't care,
which gives us 2 more slots (1 offset)...

We'd still run into problems if someone tries to use an explicit max location
and read gl_ViewportIndex / gl_LayerID in the FS, but...that's at least much
less common of a bug.

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