More clean up for synch with 0.8.42

src/osgUtil/RenderGraph.cpp

@@ -0,0 +1,62 @@
+#include "osgUtil/RenderGraph"
+
+#include "osg/Notify"
+
+using namespace osg;
+using namespace osgUtil;
+
+void RenderGraph::reset()
+{
+    _parent = NULL;
+    _stateset = NULL;
+
+    _depth = 0;
+
+    _children.clear();
+    _leaves.clear();
+}
+
+/** recursively clean the RenderGraph of all its drawables, lights and depths.
+  * Leaves children intact, and ready to be populated again.*/
+void RenderGraph::clean()
+{
+
+    // clean local drawables etc.
+    _leaves.clear();
+
+    // call clean on all children.
+    for(ChildList::iterator itr=_children.begin();
+        itr!=_children.end();
+        ++itr)
+    {
+        itr->second->clean();
+    }
+
+}
+
+/** recursively prune the RenderGraph of empty children.*/
+void RenderGraph::prune()
+{
+    std::vector<const osg::StateSet*> toEraseList;
+
+    // call prune on all children.
+    for(ChildList::iterator citr=_children.begin();
+        citr!=_children.end();
+        ++citr)
+    {
+        citr->second->prune();
+
+        if (citr->second->empty())
+        {
+            toEraseList.push_back(citr->first);
+        }
+    }
+
+    for(std::vector<const osg::StateSet*>::iterator eitr=toEraseList.begin();
+        eitr!=toEraseList.end();
+        ++eitr)
+    {
+        _children.erase(*eitr);
+    }
+
+}