Form Richard Schmidt, "The following features were added:

* the glsl plugin now supports processing #includes. The file extension sets the shader type.

* the registry releases gl objects of the shared state manager
 "

include/osgDB/SharedStateManager

@@ -70,6 +70,8 @@ namespace osgDB {
 
         bool isShared(osg::Texture* texture);
 
+        void releaseGLObjects(osg::State* state ) const;
+
     protected:
 
         inline bool shareTexture(osg::Object::DataVariance variance)