[PATCH] glamor: Use GL_STREAM_READ also for read/write access to a PBO

[Eric Anholt]

Michel Dänzer <michel at daenzer.net> writes:

> From: Michel Dänzer <michel.daenzer at amd.com>
>
> Otherwise the CPU may end up reading from non-cacheable memory, which is
> very slow.
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=84178
> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>

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