[Mesa-users] OSMesa and GLSL

[Yury Voronov]

Hi Brian,

> Different drivers support different versions of OpenGL.
>
> OSMesa w/ llvmpipe/softpipe should support up to GL 3.3 / GLSL 3.30 (IIRC).
> But you have to use the new OSMesaCreateContextAttribs() function to get a
> core profile context.

Thank you!

Now how should I compile Mesa to achieve this? I tried something like
 --disable-dri --disable-driglx-direct --disable-egl --enable-glx
--enable-texture-float --enable-osmesa --with-gallium-drivers=swrast

or --with-gallium-drivers=swr

Both gave me GL 2.1 / GLSL 1.20 with OSMESA_COMPAT_PROFILE and failed
with OSMESA_CORE_PROFILE

--with-gallium-drivers=softpipe or --with-gallium-drivers=llvmpipe
simply does not go through.

 --enable-gallium-osmesa does not seem to work also.

Any ideas?

Thanks,
Yury

On Tue, Jul 26, 2016 at 2:52 AM, Brian Paul <brianp at vmware.com> wrote:
> On 07/18/2016 06:50 AM, Yury Voronov wrote:
>>
>> Hello,
>>
>> I am quite new to Mesa, so would someone please help me understand the
>> things?
>>
>> I have some code for texture processing working on real GPUs that
>> extensively use shader
>> features. Now I'd like to put it on a back-end server with no display
>> (or even video card).
>> And I am going to use Off-Screen Mesa for this. The latest release
>> 12.0.1 claimed to support
>> OpenGL 4.3 - so I supposed GLSL 4.3 is also supported. However,
>> Shading Language Support
>> page states that only version 3.30 is supported.
>>
>> In the same time, when I compiled and linked the latest Mesa package
>> with --enable-osmesa
>> and --with-gallium-drivers=swrast (and DRI and GLX and EGL turned
>> off), I have just GLSL v1.50
>> support. No 4.00, not even 3.30! When I tried to use
>> MESA_GLSL_VERSION_OVERRIDE,
>> I've got 3.00 ES and that's it.
>>
>> So what should I use or how should I compile OSMesa in order to get
>> support of GLSL v4.00
>> or at least v3.30 ?
>
>
> Different drivers support different versions of OpenGL.
>
> OSMesa w/ llvmpipe/softpipe should support up to GL 3.3 / GLSL 3.30 (IIRC).
> But you have to use the new OSMesaCreateContextAttribs() function to get a
> core profile context.
>
> -Brian
>