From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 48131] Very large 2D texture is sometimes corrupted
Date: Wed, 08 Aug 2012 18:03:21 +0000
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https://bugs.freedesktop.org/show_bug.cgi?id=48131
Andreas Boll changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |WORKSFORME
--- Comment #6 from Andreas Boll 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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