pbuffer functions or exactly ask for the extensions we need to call the
apropriate glx extension functions for and around pbuffers extensions.
The glx 1.3 version of this functios are prefered. If this is not pressent we
are looking for the glx extensions and check for them.
Prevously we just used some mix of the glx 1.3 functions or the extension
functions without making sure that this extension is present.
"
dlopen/dlsym instead of NS*Symbol* functions for 10.3 or later. The
latter is now deprecated.
I'm not completely sure how to test the changes. But I compiled these
new changes in and ran the osgvertexprogram and osgshaders examples
and they seemed to display the same results as before.
With respect to the use of dlopen and dlsym, I was uncertain if the
usage should look like Sun or FreeBSD (or something else). Apple's man
pages discourage the use of RTLD_DEFAULT so I avoided the FreeBSD
implementation and copied the Sun implementation. I'm not sure if this
is correct/ideal or not."
Note, this required adding a unsigned int context ID to the osg::isGLUExtensionSupported(,)
and osg::isGLExtensionSupported(,) functions. This may require reimplementation
of end user code to accomodate the new calling convention.
and a fix to osg::State's secondary color code from Bob Kuehne.
Moved the body of the getGLExtensionFuncPtr() into the header to help out
support for Windows mapping of different OpenGL extensions function ptr per
dll.
