[Mesa-dev] State of llvmpipe geometry shaders?

[Jose Fonseca]

On 29/07/14 16:31, Brian Paul wrote:
> On 07/19/2014 09:16 AM, Paul 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.

You should test master.

It's probably fixed with commit bd36cbfa5aa31817a04335a7c364224d0db64428 
"st/wgl: fix implementation of wglCreateContextAttribsARB()".

Jose


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?
>
> Yeah, we probably do need some extra changes to get this to work on
> Windows.  I just don't have any time right now to look into this.  If
> you can debug it further that'd be great.
>
> -Brian
>
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