// Filename: animInterface.h
// Created by:  drose (20Sep05)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001 - 2004, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://etc.cmu.edu/panda3d/docs/license/ .
//
// To contact the maintainers of this program write to
// panda3d-general@lists.sourceforge.net .
//
////////////////////////////////////////////////////////////////////

#ifndef ANIMINTERFACE_H
#define ANIMINTERFACE_H

#include "pandabase.h"
#include "typeHandle.h"
#include "register_type.h"
#include "cycleData.h"
#include "cycleDataReader.h"
#include "cycleDataWriter.h"
#include "pipelineCycler.h"

class BamWriter;
class BamReader;
class Datagram;
class DatagramIterator;

////////////////////////////////////////////////////////////////////
//       Class : AnimInterface
// Description : This is the fundamental interface for things that
//               have a play/loop/stop type interface for frame-based
//               animation, such as animated characters.  This is the
//               base class for AnimControl and other, similar
//               classes.
////////////////////////////////////////////////////////////////////
class EXPCL_PANDA AnimInterface {
protected:
  AnimInterface();
  AnimInterface(const AnimInterface &copy);

PUBLISHED:
  virtual ~AnimInterface();
  INLINE void play();
  INLINE void play(double from, double to);
  INLINE void loop(bool restart);
  INLINE void loop(bool restart, double from, double to);
  INLINE void pingpong(bool restart);
  INLINE void pingpong(bool restart, double from, double to);
  INLINE void stop();
  INLINE void pose(double frame);

  INLINE void set_play_rate(double play_rate);
  INLINE double get_play_rate() const;
  INLINE double get_frame_rate() const;
  virtual int get_num_frames() const;

  INLINE int get_frame() const;
  INLINE int get_next_frame() const;
  INLINE double get_frac() const;
  INLINE int get_full_frame() const;
  INLINE double get_full_fframe() const;
  INLINE bool is_playing() const;

  virtual void output(ostream &out) const;

protected:
  INLINE void set_frame_rate(double frame_rate);
  INLINE void set_num_frames(int num_frames);
  virtual void animation_activated();

private:
  enum PlayMode {
    PM_pose,
    PM_play,
    PM_loop,
    PM_pingpong,
  };

  // This data is not cycled, because it is a semi-permanent part of
  // the interface.  Also, some derivatives of AnimInterface don't
  // even use it.
  int _num_frames;

  // This is the data that must be cycled between pipeline stages.
  class EXPCL_PANDA CData : public CycleData {
  public:
    CData();
    CData(const CData &copy);
    virtual CycleData *make_copy() const;
    virtual void write_datagram(BamWriter *manager, Datagram &dg) const;
    virtual void fillin(DatagramIterator &scan, BamReader *manager);
    virtual TypeHandle get_parent_type() const {
      return AnimInterface::get_class_type();
    }

    void play(double from, double to);
    void loop(bool restart, double from, double to);
    void pingpong(bool restart, double from, double to);
    void pose(double frame);

    INLINE double get_frac() const;
    int get_full_frame(int increment) const;
    double get_full_fframe() const;
    bool is_playing() const;

    virtual void output(ostream &out) const;

    void internal_set_rate(double frame_rate, double play_rate);
    double get_f() const;

    double _frame_rate;

    PlayMode _play_mode;
    double _start_time;
    double _start_frame;
    double _play_frames;
    int _from_frame;
    int _to_frame;
    
    double _play_rate;
    double _effective_frame_rate;
    bool _paused;
    double _paused_f;
  };

  PipelineCycler<CData> _cycler;
  typedef CycleDataReader<CData> CDReader;
  typedef CycleDataWriter<CData> CDWriter;

protected:
  virtual void write_datagram(BamWriter *manager, Datagram &dg);
  void fillin(DatagramIterator &scan, BamReader *manager);

public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    register_type(_type_handle, "AnimInterface");
  }

private:
  static TypeHandle _type_handle;
};

INLINE ostream &operator << (ostream &out, const AnimInterface &ai);

#include "animInterface.I"

#endif
