[Mesa-dev] multiple versions in version string

[Lucas Stach]

That's the way OpenGL versioning works, you could only expose some GL
base level if you support *all* of the needed extensions for this base
level. However every driver is free to expose additional extensions it
supports.

It is the applications job to enumerate the available extensions in
order to check which functionality it can use. If GLEW doesn't let you
use glGenBuffers although it is supported by the driver this is a bug in
GLEW, not mesa.

-- Lucas

Am Montag, den 20.06.2011, 11:22 -0600 schrieb tom fogal:
> I am trying to get some regression tests to run in Xvfb.  On my
> workstation, the GL_VERSION string from this is:
> 
>   1.4 (2.1 Mesa 7.7.1)
> 
> according to glxinfo.  The extensions fairly clearly show 2.x features.
> Is it perhaps the case that 2.1 features were available in 7.7.1, but
> not /all/ 2.1 features, and thus this was labelled incorrectly?  The
> version string seems "fixed" in more modern versions.
> 
> In any case, the above version string breaks projects like GLEW
> -- one application I have breaks because GLEW doesn't try to load
> glGenBuffers, thinking it will not be there.  A string like the above
> suggests that GLEW should just try to load whatever it can, and just
> ignore the version string from the library.
> 
> Thoughts?
> 
> -tom
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