[Bug 61349] New: [r300g, bisected] piglit rgtc-teximage-01 fails

[Bug 61349] New: [r300g, bisected] piglit rgtc-teximage-01 fails

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https://bugs.freedesktop.org/show_bug.cgi?id=61349

          Priority: medium
            Bug ID: 61349
          Keywords: regression
          Assignee: dri-devel@lists.freedesktop.org
           Summary: [r300g, bisected] piglit rgtc-teximage-01 fails
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: pavel.ondracka@email.cz
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/Gallium/r300
           Product: Mesa

./bin/rgtc-teximage-01 -auto
r300: DRM version: 2.24.0, Name: ATI RV530, ID: 0x71c5, GB: 1, Z: 2
r300: GART size: 509 MB, VRAM size: 256 MB
r300: AA compression RAM: YES, Z compression RAM: YES, HiZ RAM: YES
Got bad R channel reading back 0x8dbb as 0x1908
Got bad R channel reading back 0x8dbc as 0x1908
PIGLIT: {'result': 'fail' }

first bad commit:
commit ea63491629f48099371f725e7c3779f2982d7a52
Author: Marek Olšák <maraeo@gmail.com>
Date:   Thu Feb 7 04:36:33 2013 +0100

    st/mesa: accelerate glGetTexImage for all formats using a blit

    This commit allows using glGetTexImage during rendering and still
    maintain interactive framerates.

    This improves performance of WarCraft 3 under Wine. The framerate is
improved
    from 25 fps to 39 fps in the main menu, and from 0.5 fps to 32 fps in the
game.

    v2: fix choosing the format for decompression

GPU:RV530
Mesa: 2fa9e4c97cd7580010a8aa2eb3026e8f2bdb0035
Kernel: 3.7.3-101.fc17.i686

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[Bug 61349] [r300g, bisected] piglit rgtc-teximage-01 fails

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https://bugs.freedesktop.org/show_bug.cgi?id=61349

--- Comment #1 from Marek Olšák <maraeo@gmail.com> ---
RGTC1 texturing uses only 4 bits of precision in R500, which can cause some
piglit failures. If you run the test, you'll see how the precision affects the
filtered texture. If it's not completely wrong, let's just say this is a
hardware limitation.

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[Bug 61349] [r300g, bisected] piglit rgtc-teximage-01 fails

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https://bugs.freedesktop.org/show_bug.cgi?id=61349

--- Comment #2 from Pavel Ondračka <pavel.ondracka@email.cz> ---
(In reply to comment #1)
> RGTC1 texturing uses only 4 bits of precision in R500, which can cause some
> piglit failures. If you run the test, you'll see how the precision affects
> the filtered texture. If it's not completely wrong, let's just say this is a
> hardware limitation.

Yeah, the pictures before and after patch looks almost similar, so probably
indeed a precision bug, dunno why it passed before though.

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[Bug 61349] [r300g, bisected] piglit rgtc-teximage-01 fails

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=61349

Marek Olšák <maraeo@gmail.com> changed:

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

--- Comment #3 from Marek Olšák <maraeo@gmail.com> ---
Closing, because it's a hardware limitation.

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[Bug 61349] [r300g, bisected] piglit rgtc-teximage-01 fails

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=61349

Marek Olšák <maraeo@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |NOTABUG

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