gmchannel.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_GMCHANNEL_H
#define SKY_MUSIC_GMCHANNEL_H

#include "sky/music/musicbase.h"

class MidiDriver;

namespace Sky {

typedef struct {
    uint16 eventDataPtr;
    int32 nextEventTime;
    uint16 loopPoint;
    uint8 midiChannelNumber;
    uint8 note;
    bool channelActive;
} MidiChannelType;

class GmChannel : public ChannelBase {
public:
    GmChannel(uint8 *pMusicData, uint16 startOfData, MidiDriver *pMidiDrv, const byte *pInstMap, const byte *veloTab);
    ~GmChannel() override;
    virtual void stopNote();
    uint8 process(uint16 aktTime) override;
    void updateVolume(uint16 pVolume) override;
    bool isActive() override;
private:
    const byte *_instMap;
    const byte *_veloTab;
    MidiDriver *_midiDrv;
    uint8 *_musicData;
    uint16 _musicVolume;
    MidiChannelType _channelData;
    uint8 _currentChannelVolume;
    //-                          normal subs
    void setRegister(uint8 regNum, uint8 value);
    int32 getNextEventTime();
    uint16 getNextNote(uint8 param);
    void adlibSetupInstrument();
    void setupInstrument(uint8 opcode);
    void setupChannelVolume(uint8 volume);
    //-                          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_getPitch();           // 5
    void com90_getChannelVolume();   // 6
    //void com90_skipTremoVibro();   // 7
    void com90_loopMusic();        // 8
    void com90_keyOff();             // 9
    //void com90_error();            // 10
    void com90_getChannelPanValue(); // 11
    void com90_setLoopPoint();     // 12
    void com90_getChannelControl();     // 13
};

} // End of namespace Sky

#endif //SKYGMCHANNEL_H