Added releaseGLObjects(..) and resizeGLObjectBuffers(..) to osgShadow::ShadowTechnique's

include/osgShadow/ShadowTexture

@@ -51,6 +51,14 @@ class OSGSHADOW_EXPORT ShadowTexture : public ShadowTechnique
         virtual void cleanSceneGraph();
 
 
+        /** Resize any per context GLObject buffers to specified size. */
+        virtual void resizeGLObjectBuffers(unsigned int maxSize);
+
+        /** If State is non-zero, this function releases any associated OpenGL objects for
+           * the specified graphics context. Otherwise, releases OpenGL objects
+           * for all graphics contexts. */
+        virtual void releaseGLObjects(osg::State* = 0) const;
+
     protected :
 
         virtual ~ShadowTexture() {}