adlibchannel.h

/* 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 3 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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef SKY_MUSIC_ADLIBCHANNEL_H
#define SKY_MUSIC_ADLIBCHANNEL_H

#include "sky/music/musicbase.h"

namespace OPL {
class OPL;
}

namespace Sky {

typedef struct {
    uint8 ad_Op1, ad_Op2;
    uint8 sr_Op1, sr_Op2;
    uint8 ampMod_Op1, ampMod_Op2;
    uint8 waveSelect_Op1, waveSelect_Op2;
    uint8 bindedEffect;
    uint8 feedBack;
    uint8 totOutLev_Op1, totOutLev_Op2;
    uint8 scalingLevel;
    uint8 pad1, pad2, pad3;
} InstrumentStruct;

typedef struct {
    uint16 eventDataPtr;
    int32 nextEventTime;
    uint16 loopPoint;
    uint8 adlibChannelNumber;
    uint8 lastCommand;
    bool channelActive;
    uint8 note;
    uint8 adlibReg1, adlibReg2;
    InstrumentStruct *instrumentData;
    uint8 assignedInstrument;
    uint8 channelVolume;
    uint8 padding; // field_12 / not used by original driver
    uint8 tremoVibro;
    uint8 freqOffset;
    uint16 frequency;
} AdLibChannelType;

class AdLibChannel : public ChannelBase {
public:
    AdLibChannel (OPL::OPL *opl, uint8 *pMusicData, uint16 startOfData);
    ~AdLibChannel() override;
    uint8 process(uint16 aktTime) override;
    void updateVolume(uint16 pVolume) override;
    bool isActive() override;
private:
    OPL::OPL *_opl;
    uint8 *_musicData;
    uint16 _musicVolume;
    AdLibChannelType _channelData;

    InstrumentStruct *_instruments;
    uint16 *_frequenceTable;
    uint8 *_instrumentMap;
    uint8 *_registerTable, *_opOutputTable;
    uint8 *_adlibRegMirror;

    // normal subs
    void setRegister(uint8 regNum, uint8 value);
    int32 getNextEventTime();
    uint16 getNextNote(uint8 param);
    void adlibSetupInstrument();
    void setupInstrument(uint8 opcode);
    void setupChannelVolume(uint8 volume);
    void stopNote();

    // Streamfunctions from Command90hTable
    void com90_caseNoteOff();       // 0
    void com90_stopChannel();       // 1
    void com90_setupInstrument();   // 2
    uint8 com90_updateTempo();      // 3
    //void com90_dummy();           // 4
    void com90_getFreqOffset();     // 5
    void com90_getChannelVolume();  // 6
    void com90_getTremoVibro();     // 7
    void com90_loopMusic();         // 8
    void com90_keyOff();            // 9
    //void com90_error();           // 10
    //void com90_doLodsb();         // 11
    void com90_setLoopPoint();      // 12
    //void com90_do_two_Lodsb();    // 13
};

} // End of namespace Sky

#endif //ADLIBCHANNEL_H