[osg-users] Get openGL version with the Help of osg

[Daniel Neos]

Hi,

In my application, at the very first beginning, I want to check which openGL version the user has before creating/doing anything openGL related.

For example the user can have a very poor openGL version(or remote Desktop only supports openGL 1.1), then I want to check the openGL version first and shut down the application, if necessary.

How can I achieve the openGL version with openscenegraph the most easy way? I tried the osg::getGLVersion() but I certainly need a kind of context first.

How can I get such a context without creating windows to yield the supported openGL version?


Thank you!

Cheers,
Daniel

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http://forum.openscenegraph.org/viewtopic.php?p=68280#68280





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[Jannik Heller]

Hi,

Unfortunately OpenGL doesn't support getting the supported version without creating a context first.

https://gamedev.stackexchange.com/questions/28451/how-do-i-properly-check-if-a-particular-opengl-version-is-available

https://stackoverflow.com/questions/12184506/why-does-glgetstringgl-version-return-null-zero-instead-of-the-opengl-versio

------------------
Read this topic online here:

http://forum.openscenegraph.org/viewtopic.php?p=68294#68294

[Robert Osfield]

Daniel,

You can use a custom realize operation to do OpenGL checks when the
viewer creates the graphics windows for the first time. The osgvolume
example uses this approach to check 3D texture sizes, you could eaily
add in the version check here.

Robert.