gwaldron/osgearth — pull request #358 by chrisstankevitz (2013-09-04 00:04:26+00:00)
Title: Call osg::Program::releaseGLObjects from within VirtualProgram::releaseG...

I believe VirtualProgram is not properly cleaning up during a shutdown. This is preventing me from destroying my viewer (and graph) and starting another. This change causes the VP to release the GL objects contained in its osg::Programs when told.