[Mesa-dev] State of llvmpipe geometry shaders?

[Brian Paul]

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