[Bug 72586] New: glScissor doesn't work with Mesa 9.2 on Intel GPUs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72586

          Priority: medium
            Bug ID: 72586
          Assignee: idr at freedesktop.org
           Summary: glScissor doesn't work with Mesa 9.2 on Intel GPUs
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: bk at f-m.fm
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 9.2
         Component: Drivers/DRI/i965
           Product: Mesa

glScissor stopped working correctly in Mesa 9.2 (it only affects Intel driver).
It seems that once scissor gets set it can't be disabled, nor changed.

It worked on:

OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Mobile
OpenGL version string: 3.0 Mesa 9.1.7
OpenGL shading language version string: 1.30

Stopped working with:

OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Mobile
OpenGL core profile version string: 3.1 (Core Profile) Mesa 9.2.1
OpenGL core profile shading language version string: 1.40
OpenGL core profile context flags: (none)
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 9.2.1
OpenGL shading language version string: 1.30

And doesn't work on:

OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Ivybridge Mobile
OpenGL version string: 3.0 Mesa 10.0.0-devel (git-ff337bc)
OpenGL shading language version string: 1.30

Here is some more info about the issue:
https://github.com/bkaradzic/bgfx/issues/48

Apitrace was created on SandyBridge, and it replays correctly with the same
Mesa 9.2 Nouveau and NVIDIA 319.32 propriatery drivers. Also I tested my code
on OpenGL on Windows and OSX (let me know if you need more info about these
drivers).

I don't have code sample of this problem but you could glretrace attached
trace, to see the issue. Also github issue mentioned above has screenshots.

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