[Bug 83908] New: [i965] Incorrect icon colors in Steam Big Picture

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83908

          Priority: medium
            Bug ID: 83908
          Assignee: idr at freedesktop.org
           Summary: [i965] Incorrect icon colors in Steam Big Picture
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: cody at lunarg.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Drivers/DRI/i965
           Product: Mesa

Created attachment 106346
  --> https://bugs.freedesktop.org/attachment.cgi?id=106346&action=edit
Bad icons in Steam Big Picture mode

During testing of SteamOS, we would sometimes see incorrect icon colors in
Steam Big Picture mode.

I was able to capture the behavior in a trace.  I've attached a screenshot of
the issue.  I've got a 137MB apitrace file of it, if anyone is interested.

We bisected it to 61e264f4, which changes the internal format of textures,
routing glTexImage2D to new code paths.

We debugged it to PBO offsets that are not naturally pixel aligned, which
causes the BLT path to drop bits.

I've got a fix to send to the list, and will also submit a piglit test that
shows the issue.

I'll update this bug as I send out the patches and tests.

-C

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