[Mesa-dev] [Bug 42487] Teapot visual artifact

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=42487

Brian Paul <brianp at vmware.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|                            |NOTABUG

--- Comment #3 from Brian Paul <brianp at vmware.com> 2011-11-02 10:50:55 UTC ---
(In reply to comment #2)
> I've narrowed the bug :
> the faulty command is
> 
> glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
> 
> Adding an additionnal GLUT_DEPTH param make the code works.
> 
> AMD and Nvidia proprietary drivers seem to force GLUT_DEPTH in display mode
> when depth_test are enabled. I have no idea if there is a spec that tells if
> such a behavior is legit or not, I'm marking this as NEEDINFO.

I think what's really happening is you're getting a GLX visual with a depth
buffer just by luck with AMD/NVIDIA.

glxinfo will show you which visuals have a depth buffer.  With the NVIDIA
driver, most visuals have a depth buffer.  Probably the same thing with AMD's
driver.

If your application uses depth testing you _must_ call glutInitDisplayMode()
with GLUT_DEPTH.  Similarly with stencil and accum buffers.

I think we can close this as not-a-bug.

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