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

[bugzilla-daemon at freedesktop.org]

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 at lists.freedesktop.org
        ReportedBy: bjacob at 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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