[Bug 48131] New: Very large 2D texture is sometimes corrupted

[Bug 48131] New: Very large 2D texture is sometimes corrupted

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=48131

             Bug #: 48131
           Summary: Very large 2D texture is sometimes corrupted
    Classification: Unclassified
           Product: Mesa
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/R600
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: bjacob@mozilla.com


This WebGL testcase just creates a huge blank texture and draws a quad with it:

http://people.mozilla.org/~bjacob/webgltexture2D5k.html

You should see only black. But here I occasionally see some corruption with
vertical yellow stripes on a rectangular part of the image. Reloading the page
a few times makes the problem go away.

The testcase uses webgl.texImage2D with null pixel data, which causes the
browser to calloc() a buffer and pass it to glTexImage2D. So it's not just an
uninitialized texture. The application is doing what's right to properly
initialize the texture with zero'd image data.

If there is any risk that this might be exposing uninitialized texture memory,
then please treat this as a high priority, as we'd have to find a work around.

FWIW, on a different proprietary platform, this does expose video memory and
forced us to artificially limit the max texture size to 4k.

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[Bug 48131] Very large 2D texture is sometimes corrupted

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https://bugs.freedesktop.org/show_bug.cgi?id=48131

--- Comment #1 from Benoit Jacob <bjacob@mozilla.com> 2012-03-31 12:40:44 PDT ---
By the way, this is on Ubuntu 11.10, 64 bit,

X.Org -- Gallium 0.4 on AMD RV710 -- 2.1 Mesa 7.11

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[Bug 48131] Very large 2D texture is sometimes corrupted

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https://bugs.freedesktop.org/show_bug.cgi?id=48131

--- Comment #2 from Alex Deucher <agd5f@yahoo.com> 2012-04-01 06:00:32 PDT ---
Can you try with a newer version of mesa?

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[Bug 48131] Very large 2D texture is sometimes corrupted

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https://bugs.freedesktop.org/show_bug.cgi?id=48131

--- Comment #3 from Benoit Jacob <bjacob@mozilla.com> 2012-04-02 13:40:51 PDT ---
Maybe, if there is a package for Ubuntu 11.10 that is safe and easy to install?

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[Bug 48131] Very large 2D texture is sometimes corrupted

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https://bugs.freedesktop.org/show_bug.cgi?id=48131

--- Comment #4 from Robert Hooker (Sarvatt) <sarvatt@gmail.com> 2012-04-02 14:35:38 PDT ---
The safest way would be to just try a 12.04 beta 2 or newer livecd out, it has
8.0.2

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[Bug 48131] Very large 2D texture is sometimes corrupted

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https://bugs.freedesktop.org/show_bug.cgi?id=48131

Sven Arvidsson <sa@whiz.se> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sa@whiz.se

--- Comment #5 from Sven Arvidsson <sa@whiz.se> 2012-04-02 15:32:53 PDT ---
FWIW, for me the test segfaults with 8.0 but works (without artefacts AFAICT)
with 8.0.2. This is on a HD 5670.

(I suppose the component of the bug should be moved to Drivers/Gallium/r600 ?)

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[Bug 48131] Very large 2D texture is sometimes corrupted

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https://bugs.freedesktop.org/show_bug.cgi?id=48131

Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Drivers/DRI/R600            |Drivers/Gallium/r600

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[Bug 48131] Very large 2D texture is sometimes corrupted

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https://bugs.freedesktop.org/show_bug.cgi?id=48131

Andreas Boll <andreas.boll.dev@gmail.com> changed:

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

--- Comment #6 from Andreas Boll <andreas.boll.dev@gmail.com> 2012-08-08 18:03:21 UTC ---
(In reply to comment #0)
> This WebGL testcase just creates a huge blank texture and draws a quad with it:
> 
> http://people.mozilla.org/~bjacob/webgltexture2D5k.html
> 
> You should see only black. But here I occasionally see some corruption with
> vertical yellow stripes on a rectangular part of the image. Reloading the page
> a few times makes the problem go away.
> 
> The testcase uses webgl.texImage2D with null pixel data, which causes the
> browser to calloc() a buffer and pass it to glTexImage2D. So it's not just an
> uninitialized texture. The application is doing what's right to properly
> initialize the texture with zero'd image data.
> 
> If there is any risk that this might be exposing uninitialized texture memory,
> then please treat this as a high priority, as we'd have to find a work around.
> 
> FWIW, on a different proprietary platform, this does expose video memory and
> forced us to artificially limit the max texture size to 4k.

With current firefox nightly 20120808
and current mesa 8.1-devel (git-be42a45) this site works for me.
I see only black.

WebGL Renderer: X.Org -- Gallium 0.4 on AMD RV770 -- 2.1 Mesa 8.1-devel
(git-be42a45)

Feel free to reopen this report if the issue persists.

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