// Filename: cullStateSubtree.h
// Created by:  drose (07Apr00)
// 
////////////////////////////////////////////////////////////////////

#ifndef CULLSTATESUBTREE_H
#define CULLSTATESUBTREE_H

#include <pandabase.h>

#include "cullStateLookup.h"

#include <allTransitionsWrapper.h>
#include <updateSeq.h>
#include <referenceCount.h>

class CullStateLookup;

////////////////////////////////////////////////////////////////////
// 	 Class : CullStateSubtree
// Description : A specialization of CullStateLookup for tracking the
//               state at and below an instanced node in the scene
//               graph.
////////////////////////////////////////////////////////////////////
class EXPCL_PANDA CullStateSubtree : public CullStateLookup {
public:
  INLINE CullStateSubtree(CullStateLookup *parent,
			  const AllTransitionsWrapper &trans, 
			  Node *top_subtree,
			  UpdateSeq now);
  virtual ~CullStateSubtree();

  bool check_currency(const AllTransitionsWrapper &trans, 
		      Node *top_subtree,
		      UpdateSeq now);
  INLINE void update(const AllTransitionsWrapper &trans,
		     Node *top_subtree,
		     UpdateSeq now);

  virtual Node *get_top_subtree() const;

  virtual void compose_trans(const AllTransitionsWrapper &from,
			     AllTransitionsWrapper &to) const;

private:
  CullStateLookup *_parent;
  AllTransitionsWrapper _trans;
  AllTransitionsWrapper _trans_from_root;
  Node *_top_subtree;
  UpdateSeq _verified;
};

#include "cullStateSubtree.I"

#endif