Added GLSL shader pathway into osgforest.
Added GLSL shader pathway into osgforest.


XiaoCC/osg,XiaoCC/osg,artoolkit/osg,ntoand/osg,ghub/osg,koshman86/osg,ntoand/osg,XiaoCC/osg,artoolkit/osg,ntoand/osg,omega-hub/osg,omega-hub/osg,stmh/osg,artoolkit/osg,omega-hub/osg,stmh/osg,stmh/osg,stmh/osg,artoolkit/osg,koshman86/osg,ghub/osg,XiaoCC/osg,koshman86/osg,koshman86/osg,ghub/osg,omega-hub/osg,XiaoCC/osg,ghub/osg,stmh/osg,ntoand/osg