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/* ScummVM - Graphic Adventure Engine
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * $URL$
 * $Id$


#include "audio/softsynth/fmtowns_pc98/towns_pc98_fmsynth.h"

00031 class TownsAudioInterfacePluginDriver {
      virtual ~TownsAudioInterfacePluginDriver() {}
      virtual void timerCallback(int timerId) = 0;

class TownsAudio_PcmChannel;
class TownsAudio_WaveTable;

00040 class TownsAudioInterface : public TownsPC98_FmSynth {
      TownsAudioInterface(Audio::Mixer *mixer, TownsAudioInterfacePluginDriver *driver);

      bool init();

      int callback(int command, ...);

      void setMusicVolume(int volume);
      void setSoundEffectVolume(int volume);
      // Defines the channels used as sound effect channels for the purpose of ScummVM GUI volume control.
      // The first 6 bits are the 6 fm channels. The next 8 bits are pcm channels.
      void setSoundEffectChanMask(int mask);

      void nextTickEx(int32 *buffer, uint32 bufferSize);

      void timerCallbackA();
      void timerCallbackB();

      typedef int (TownsAudioInterface::*TownsAudioIntfCallback)(va_list &);
      const TownsAudioIntfCallback *_intfOpcodes;

      int intf_reset(va_list &args);
      int intf_keyOn(va_list &args);
      int intf_keyOff(va_list &args);
      int intf_setPanPos(va_list &args);
      int intf_setInstrument(va_list &args);
      int intf_loadInstrument(va_list &args);
      int intf_setPitch(va_list &args);
      int intf_setLevel(va_list &args);
      int intf_chanOff(va_list &args);
      int intf_writeReg(va_list &args);
      int intf_writeRegBuffer(va_list &args);
      int intf_readRegBuffer(va_list &args);
      int intf_setTimerA(va_list &args);
      int intf_setTimerB(va_list &args);
      int intf_enableTimerA(va_list &args);
      int intf_enableTimerB(va_list &args);
      int intf_loadSamples(va_list &args);
      int intf_reserveEffectChannels(va_list &args);
      int intf_loadWaveTable(va_list &args);
      int intf_unloadWaveTable(va_list &args);
      int intf_pcmPlayEffect(va_list &args);
      int intf_pcmChanOff(va_list &args);
      int intf_pcmEffectPlaying(va_list &args);
      int intf_fmKeyOn(va_list &args);
      int intf_fmKeyOff(va_list &args);
      int intf_fmSetPanPos(va_list &args);
      int intf_fmSetInstrument(va_list &args);
      int intf_fmLoadInstrument(va_list &args);
      int intf_fmSetPitch(va_list &args);
      int intf_fmSetLevel(va_list &args);
      int intf_fmReset(va_list &args);
      int intf_setOutputVolume(va_list &args);
      int intf_resetOutputVolume(va_list &args);
      int intf_updateOutputVolume(va_list &args);
      int intf_cdaToggle(va_list &args);
      int intf_pcmUpdateEnvelopeGenerator(va_list &args);

      int intf_notImpl(va_list &args);

      void fmReset();
      int fmKeyOn(int chan, int note, int velo);
      int fmKeyOff(int chan);
      int fmChanOff(int chan);
      int fmSetPanPos(int chan, int mode);
      int fmSetInstrument(int chan, int instrId);
      int fmLoadInstrument(int instrId, const uint8 *data);
      int fmSetPitch(int chan, int pitch);
      int fmSetLevel(int chan, int lvl);

      void bufferedWriteReg(uint8 part, uint8 regAddress, uint8 value);

      uint8 _fmChanPlaying;
      uint8 _fmChanNote[6];
      int16 _fmChanPitch[6];

      uint8 *_fmSaveReg[2];
      uint8 *_fmInstruments;

      void pcmReset();
      int pcmKeyOn(int chan, int note, int velo);
      int pcmKeyOff(int chan);
      int pcmChanOff(int chan);
      int pcmSetPanPos(int chan, int mode);
      int pcmSetInstrument(int chan, int instrId);
      int pcmLoadInstrument(int instrId, const uint8 *data);
      int pcmSetPitch(int chan, int pitch);
      int pcmSetLevel(int chan, int lvl);
      void pcmUpdateEnvelopeGenerator(int chan);

      TownsAudio_PcmChannel *_pcmChan;
      uint8 _pcmChanOut;
      uint8 _pcmChanReserved;
      uint8 _pcmChanKeyPressed;
      uint8 _pcmChanEffectPlaying;
      uint8 _pcmChanKeyPlaying;

      uint8 _pcmChanNote[8];
      uint8 _pcmChanVelo[8];
      uint8 _pcmChanLevel[8];

      uint8 _numReservedChannels;
      uint8 *_pcmInstruments;

      TownsAudio_WaveTable *_waveTables;
      uint8 _numWaveTables;
      uint32 _waveTablesTotalDataSize;

      void pcmCalcPhaseStep(TownsAudio_PcmChannel *p, TownsAudio_WaveTable *w);

      void updateOutputVolume();
      uint8 _outputVolumeFlags;
      uint8 _outputLevel[16];
      uint8 _outputMuteFlags;

      const float _baserate;
      uint32 _timerBase;
      uint32 _tickLength;
      uint32 _timer;

      uint16 _musicVolume;
      uint16 _sfxVolume;
      int _pcmSfxChanMask;

      TownsAudioInterfacePluginDriver *_drv;
      bool _ready;

      static const uint8 _chanFlags[];
      static const uint16 _frequency[];
      static const uint8 _carrier[];
      static const uint8 _fmDefaultInstrument[];
      static const uint16 _pcmPhase1[];
      static const uint16 _pcmPhase2[];


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