[Bug 92900] [regression bisected] About 700 piglit regressions is what could go wrong

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92900

            Bug ID: 92900
           Summary: [regression bisected] About 700 piglit regressions is
                    what could go wrong
           Product: Mesa
           Version: 11.0
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/R100
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: idr at freedesktop.org
        QA Contact: dri-devel at lists.freedesktop.org

About 700 piglit tests regressed on r100.  This includes, but is not limited
to:

All 648 subcases of clipflat
fbo-1d
fbo-clearmipmap
fbo-sys-sub-blit
gen-nonzero-unit
...

At least fbo-clearmipmap bisected to the following commit.  I did this bisect
using 'git bisect run' with that one test, and I haven't verified all the
others yet.

Tested on:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV200
[Radeon 7500/7500 LE]


This commit is in Mesa 11.0.

d21320f6258b2e1780a15c1ca718963d8a15ca18 is the first bad commit
commit d21320f6258b2e1780a15c1ca718963d8a15ca18
Author: Roland Scheidegger <sroland at vmware.com>
Date:   Thu Jul 16 03:18:20 2015 +0200

    radeon: fix some potential big endian issues

    The formats chosen (both by texture format choser, fbo storage allocation)
    are different for big endian not just for rgba8 but also lower bit width
    formats (why I don't actually know). Even the function to test for
renderable
    formats used different formats, however the actual colorbuffer setup did
not.
    And the blitter did not take that into account neither.
    Untested (what could possibly go wrong...).

    Acked-by: Marek Olšák <marek.olsak at amd.com>

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