From Wang Rui, new native binary/ascii format infrastructure and wrappers.

From Robert Osfield, refactor of Wang Rui's original osg2 into 3 parts - parts placed into osgDB, the ReaderWriter placed into src/osg/Plugin/osg and wrappers into src/osgWrappers/serializers/osg

src/osgWrappers/serializers/osg/Geode.cpp

@@ -0,0 +1,41 @@
+#include <osg/Geode>
+#include <osgDB/ObjectWrapper>
+#include <osgDB/InputStream>
+#include <osgDB/OutputStream>
+
+static bool checkDrawables( const osg::Geode& node )
+{
+    return node.getNumDrawables()>0;
+}
+
+static bool readDrawables( osgDB::InputStream& is, osg::Geode& node )
+{
+    unsigned int size = 0; is >> size >> osgDB::BEGIN_BRACKET;
+    for ( unsigned int i=0; i<size; ++i )
+    {
+        osg::Drawable* drawable = dynamic_cast<osg::Drawable*>( is.readObject() );
+        if ( drawable ) node.addDrawable( drawable );
+    }
+    is >> osgDB::END_BRACKET;
+    return true;
+}
+
+static bool writeDrawables( osgDB::OutputStream& os, const osg::Geode& node )
+{
+    unsigned int size = node.getNumDrawables();
+    os << size << osgDB::BEGIN_BRACKET << std::endl;
+    for ( unsigned int i=0; i<size; ++i )
+    {
+        os << node.getDrawable(i);
+    }
+    os << osgDB::END_BRACKET << std::endl;
+    return true;
+}
+
+REGISTER_OBJECT_WRAPPER( Geode,
+                         new osg::Geode,
+                         osg::Geode,
+                         "osg::Object osg::Node osg::Geode" )
+{
+    ADD_USER_SERIALIZER( Drawables );  // _drawables
+}