fltInstanceDefinition.h

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/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file fltInstanceDefinition.h
 * @author drose
 * @date 2000-08-30
 */

#ifndef FLTINSTANCEDEFINITION_H
#define FLTINSTANCEDEFINITION_H

#include "pandatoolbase.h"

#include "fltBead.h"

/**
 * This special kind of record marks the top node of an instance subtree.
 * This subtree lives outside of the normal hierarchy, and is MultiGen's way
 * of supporting instancing--each instance subtree has a unique index, which
 * may be referenced in a FltInstanceRef object to make the instance appear in
 * various places in the hierarchy.
 */
class FltInstanceDefinition : public FltBead {
public:
  FltInstanceDefinition(FltHeader *header);

  int _instance_index;

protected:
  virtual bool extract_record(FltRecordReader &reader);
  virtual bool build_record(FltRecordWriter &writer) const;

public:
  virtual TypeHandle get_type() const {
    return get_class_type();
  }
  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    FltBead::init_type();
    register_type(_type_handle, "FltInstanceDefinition",
                  FltBead::get_class_type());
  }

private:
  static TypeHandle _type_handle;

  friend class FltInstanceRef;
  friend class FltRecordWriter;
};

#endif