[Bug 70601] [SNB Bisected]Piglit spec/ARB_texture_float/multisample-formats 2 GL_ARB_texture_float fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70601

Paul Berry <stereotype441 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #9 from Paul Berry <stereotype441 at gmail.com> ---
Fixed by commit c4cf487315f1f5375534f1677177983fa496d577
Author: Paul Berry <stereotype441 at gmail.com>
Date:   Wed Nov 27 07:43:03 2013 -0800

    i965/gen6: Fix multisample resolve blits for luminance/intensity 32F
formats

    On gen6, multisamble resolve blits use the SAMPLE message to blend
    together the 4 samples for each texel.  For some reason, SAMPLE
    doesn't blend together the proper samples when the source format is
    L32_FLOAT or I32_FLOAT, resulting in blocky artifacts.

    To work around this problem, sample from the source surface using
    R32_FLOAT.  This shouldn't affect rendering correctness, because when
    doing these resolve blits, the destination format is R32_FLOAT, so the
    channel replication done by L32_FLOAT and I32_FLOAT is unnecessary.

    Fixes piglit tests on Sandy Bridge:
    - spec/ARB_texture_float/multisample-formats 2 GL_ARB_texture_float
    - spec/ARB_texture_float/multisample-formats 4 GL_ARB_texture_float

    No piglit regressions on Sandy Bridge.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=70601

    Cc: Kenneth Graunke <kenneth at whitecape.org>
    Cc: mesa-stable at lists.freedesktop.org

    Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

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