OSMesa and GLSL

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 ?

Thanks a lot,
Yury
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