[osg-users] Fwd: OpenGL EXTENSION support

ami guru dosto.walla at gmail.com
Thu Mar 19 03:41:29 PDT 2009

Hello Robert,

Thanks for the hint.

But i did not understand the idea of "Current OpenGL context"

And the class that you specified requires a context id to instantiate
GL2Extensions object.

Any more reference into that matter would be of great help


---------- Forwarded message ----------
From: Robert Osfield <robert.osfield at gmail.com>
Date: 2009/3/19
Subject: Re: [osg-users] OpenGL EXTENSION support
To: OpenSceneGraph Users <osg-users at lists.openscenegraph.org>

HI Sajjad,

2009/3/18 ami guru <dosto.walla at gmail.com>

> Is there any class or interface in OSG that can query and print out the
> supported extensions within the OpenGL driver ?

There isn't a single method that returns a list of all supported extensions,
but there are various methods for getting OpenGL function pointers and
checking whether a specific extension is supported.  See

Please note you'll need to have a valid graphics context, and for the
extensions to be initialised before the functions will work as you can only
do OpenGL calls from a thread with a valid graphics context.

If you have happy do debug work on your app, then enable the verbose debug
messages and this will output the lists of supported extensions for you.
set the env var OSG_NOTIFY_LEVEL to DEBUG.


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