[Mesa-dev] [Bug 59872] New: [swrast] piglit depth_texture_mode_and_swizzle regression

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59872

          Priority: medium
            Bug ID: 59872
          Keywords: regression
                CC: cworth at cworth.org
          Assignee: mesa-dev at lists.freedesktop.org
           Summary: [swrast] piglit depth_texture_mode_and_swizzle
                    regression
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: vlee at freedesktop.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Mesa core
           Product: Mesa

mesa: c1d35aece0afc2822d6d9f6c22664c04e6fcbba3 (master)

$ ./bin/depth_texture_mode_and_swizzle -auto
Probe at (10,10)
  Expected: 0.500000 0.500000 0.500000 0.500000
  Observed: 0.501961 0.501961 0.501961 1.000000
Probe at (30,10)
  Expected: 1.000000 0.500000 0.500000 0.500000
  Observed: 1.000000 0.501961 0.501961 1.000000
Probe at (130,10)
  Expected: 0.000000 0.000000 0.000000 0.500000
  Observed: 0.000000 0.000000 0.000000 1.000000
Probe at (150,10)
  Expected: 1.000000 0.000000 0.500000 0.000000
  Observed: 1.000000 0.000000 0.501961 1.000000
PIGLIT: {'result': 'fail' }


570ed2be7d776211e1ca2a7a4c44ee6a1d141714 is the first bad commit
commit 570ed2be7d776211e1ca2a7a4c44ee6a1d141714
Author: Carl Worth <cworth at cworth.org>
Date:   Mon Jan 21 12:16:27 2013 -0800

    ReadPixels: Force ALPHA to 1 while rebasing RGBA values for GL_RGB format

    When performing a ReadPixels operation, we may be reading from a buffer
that
    stores alpha values, but that is actually representing a buffer with no
alpha
    channel. In this case, while rebasing the values, touch up all alpha values
    read to 1.0.

    This commit fixes the following piglit (sub) tests:

        ARB_texture_float/fbo-colormask-formats
            GL_RBG16F_ARB
        EXT_texture_snorm/fbo-colormask-formats
            GL_RGB16_SNORM
            GL_RGB8_SNORM
            GL_RGB_SNORM

    It likely improves the results of other tests as well, but a PASS remains
    elusive due to additional bugs.

    Reviewed-by: Brian Paul <brianp at vmware.com>
    Reviewed-by: Anuj Phogat <anuj.phogat at gmail.com>

:040000 040000 144369a7d3779929bad84beca8f3a5b2ccf90640
c25eb37e73f6f6e5435230fe8a799b1b62ed347b M    src
bisect run success

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