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

[bugzilla-daemon at freedesktop.org]

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

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

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

--- Comment #6 from Andreas Boll <andreas.boll.dev at 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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