Renamed osgUtil::RenderGraph to osgUtil::StateGraph

src/osgUtil/StateGraph.cpp

@@ -0,0 +1,74 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+#include <osgUtil/StateGraph>
+
+#include <osg/Notify>
+
+using namespace osg;
+using namespace osgUtil;
+
+void StateGraph::reset()
+{
+    _parent = NULL;
+    _stateset = NULL;
+
+    _depth = 0;
+
+    _children.clear();
+    _leaves.clear();
+}
+
+/** recursively clean the StateGraph of all its drawables, lights and depths.
+  * Leaves children intact, and ready to be populated again.*/
+void StateGraph::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 StateGraph of empty children.*/
+void StateGraph::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);
+    }
+
+}