[Mesa-dev] State of llvmpipe geometry shaders?

[Ceniza]

Hi again.

It seems I finally found out the trick, even though the render tests in
OpenGL Extensions Viewer for OpenGL >3 will still remain disabled.

The following environment variable must be defined in order to get OpenGL
3.3 support with a forward context: MESA_GL_VERSION_OVERRIDE=3.3FC

I can confirm that using geometry shaders works, but any attempt to use an
OpenGL function not belonging to the core profile will cause the
application to die (in debug build, the problem points to what seems to be
a calling convention mismatch). I wonder if this is the expected behavior...

Regards,

Paul.


On Sat, Jul 19, 2014 at 5:16 PM, Paul <ceniza666 at gmail.com> wrote:

> Brian Paul <brianp <at> vmware.com> writes:
>
> >
> > On 07/11/2014 01:47 AM, Florian Link wrote:
> > > Hi everyone,
> > >
> > > I read a post from 2012 that MESA supports geometry shaders. I tried a
> > > current MESA 10.2.x release, but MESA GL_VERSION returns OpenGL version
> > > 3.0 (not 3.2) and the
> > > GL_ARB_geometry_shader4 extension is not reported in the MESA
> extensions.
> > > The function lookup for the functions of GL_ARB_geometry_shader4 works,
> > > though.
> > > When I run a shader program with a geometry shader, the MESA linker
> > > complains that the varying that is used in the fragment shader is not
> > > emitted from the vertex shader, which indicates that the geometry
> shader
> > > is not detected/used.
> > >
> > > Should geometry shaders work in the current MESA llvm pipe release, or
> > > do I need to enable/compile in some code?
> > >
> > > regards,
> > > Florian
> > >
> > > P.S. My geometry shader works on non-MESA native ATI/NVidia/Intel
> OpenGL
> > > drivers, so I don't think it is a problem of my shader code, especially
> > > the ATI drivers are quite strict.
> >
> > llvmpipe supports GS, but only in core profiles.  With glxinfo, use the
> > -c option to see core profile version/extension info.
> >
> > -Brian
> >
>
> Hi.
>
> I was also wondering about geometry shaders and the core profile with
> llvmpipe. I have cross compiled Mesa for Windows following the steps at qt-
> project, then tested the DLL with OpenGL Extensions Viewer. All I get is
> OpenGL 3.0, and no core profiles. I have tested versions 10.2.2, 10.2.3 and
> 10.3.0-devel with no luck so far. This message is as close as I have gotten
> to an answer, but it only seems to indicate that in Linux it just works (if
> you ask for a core profile).
>
> Is it supported in Windows? If so, is there something that needs to be done
> to enable the core profile?
>
> Regards,
>
> Paul.
>
>
> _______________________________________________
> mesa-dev mailing list
> mesa-dev at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/mesa-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/mesa-dev/attachments/20140721/ab9eecd8/attachment-0001.html>