[Mesa-dev] State of llvmpipe geometry shaders?

[P.A. Jimenez]

master indeed works without having to set the environment variable (at
least with a simple test program targeting OpenGL 3.3 core using a geometry
shader). OpenGL Extensions Viewer, however, still sees only OpenGL 3.0
without the environment variable set. Although, it would be nice to find
out what steps cause that program not to see the forward contexts, the fact
that explicitly asking for one (forward context) works is quite
satisfactory.

Thanks for pointing out that the solution has already been committed.

On Tue, Jul 29, 2014 at 7:24 PM, Jose Fonseca <jfonseca at vmware.com> wrote:

> 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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>>
>
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