[osg-users] problems with checking for OpenGL extensions

Robert Osfield robert.osfield at gmail.com
Thu Jul 24 10:07:01 PDT 2008


Hi Steffen,

To find out what extensions the OSG is seeing enable verbose debugging via:

   export OSG_NOTIFY_LEVEL=DEBUG
   osgviewer cow.osg

Then it'll list, among lots of other stuff, the extensions supported.

Robert.

On Thu, Jul 24, 2008 at 5:59 PM, Steffen Kim <mailto.stk at web.de> wrote:
> Hi,
>
> I've got another problem with using OpenGL-code in connection with OpenSceneGraph.
>
> I have an OpenGL-API that I use in my OSG-application. This API won't work when there are some required OpenGl-extensions missing. Instead it will list the missing extensions.
> In my application it does just that because it cannot find some of them.
>
> Strange thing is that when running the example-programs that came with the API outside of my program everything works just fine. Also according to "OpenGL Extension Viewer" my hardware should support these features.
>
> I read that there is also an OSG-function to test on extensions but since I have no influence on the API I have to find out why its internal checks fail when used in my application.
>
> Does anyone have an idea why these problems possibly occur and what I have to change or do about it to make it work?
> I thought the provided extensions just depend on the graphics driver... is this wrong? Could there be some conflicts with the libraries I'm using?
>
> If this already has been answered somewhere I'm sorry. I read through some posts concerning extensions but nothing seemed to fit to my problem.
>
> Thanks in advance,
> Steffen
>
>
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