[Mesa-dev] [Bug 94254] [llvmpipe] [softpipe] piglit read-front regression

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94254

            Bug ID: 94254
           Summary: [llvmpipe] [softpipe] piglit read-front regression
           Product: Mesa
           Version: 11.2
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Keywords: bisected, regression
          Severity: normal
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: vlee at freedesktop.org
        QA Contact: mesa-dev at lists.freedesktop.org
                CC: brianp at vmware.com, idr at freedesktop.org,
                    jfonseca at vmware.com, marta.lofstedt at intel.com,
                    nanleychery at gmail.com

mesa: 2999257e0fe703f73d32620fed88040d29ac5bac (master 11.3.0-devel)

$ ./bin/read-front -auto
Probe color at (0,0)
  Expected: 0.000000 0.000000 1.000000
  Observed: -0.000000 0.000000 0.000000
Probe color at (0,80)
  Expected: 0.000000 1.000000 0.000000
  Observed: -0.000000 0.000000 0.000000
PIGLIT: {"result": "fail" }

605832736a6d9427ad894d403cceeb74a5b18dc1 is the first bad commit
commit 605832736a6d9427ad894d403cceeb74a5b18dc1
Author: Nanley Chery <nanley.g.chery at intel.com>
Date:   Fri Feb 5 16:21:33 2016 -0800

    mesa/readpix: Clip ReadPixels() area to the ReadBuffer's

    The fast path for Intel's ReadPixels() unintentionally omits clipping
    the specified area to a valid one. Rather than clip in various
    corner-cases, perform this operation in the API validation stage.

    The bug in intel_readpixels_tiled_memcpy() showed itself when the winsys
    ReadBuffer's height was smaller than the one specified by ReadPixels().
    yoffset became negative, which was an invalid input for tiled_to_linear().

    v2: Move clipping to validation stage (Jason)

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92193
    Reported-by: Marta Löfstedt <marta.lofstedt at intel.com>
    Cc: "11.0 11.1" <mesa-stable at lists.freedesktop.org>
    Signed-off-by: Nanley Chery <nanley.g.chery at intel.com>
    Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
    Reviewed-by: Brian Paul <brianp at vmware.com>

:040000 040000 0f8b2af912e9f15eb83e20c0dfbf625fc7577e6b
08261118001653553be85da5b3d8f9bd3a7ad6f8 M    src
bisect run success

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