[Bug 97169] xmgrace graphical issues with Intel gen4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97169

--- Comment #7 from Kenneth Graunke <kenneth at whitecape.org> ---
Note that Gen4-5 don't expose GLSL 1.30, so many of Glamor's integer code paths
will be disabled (as GLSL 1.10-1.20 allow integers to be represented as floats,
so e.g. bitfield tricks may not work).

Gen4-5 of course use real integers, so we really ought to find a way to get
Glamor using integer paths properly.  I believe those paths are faster, as well
as better tested.  Ian has a couple of GL_MESA_* extensions in progress we
might be able to leverage...

(I don't know that this is actually the problem, it's just a difference between
Gen4-5 and Gen6+ that could be relevant.  We'll have to look into it properly.)

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