midi.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 SCUMM_IMUSE_DRV_MIDI_H
#define SCUMM_IMUSE_DRV_MIDI_H

#include "audio/mididrv.h"

namespace Scumm {

class IMuseChannel_Midi;
class IMuseChannel_MT32;
struct ChannelNode;

class IMuseDriver_GMidi : public MidiDriver {
    friend class IMuseChannel_Midi;
public:
    IMuseDriver_GMidi(MidiDriver::DeviceHandle dev, bool rolandGSMode, bool newSystem);
    virtual ~IMuseDriver_GMidi() override;

    int open() override;
    void close() override;

    // Just pass these through...
    bool isOpen() const override { return _drv ? _drv->isOpen() : false; }
    uint32 property(int prop, uint32 param) override { return _drv ? _drv->property(prop, param) : 0; }
    void setTimerCallback(void *timerParam, Common::TimerManager::TimerProc timerProc) override { if (_drv) _drv->setTimerCallback(timerParam, timerProc); }
    uint32 getBaseTempo() override { return _drv ? _drv->getBaseTempo() : 0; }
    void send(uint32 b) override { if (_drv) _drv->send(b); };
    void sysEx(const byte *msg, uint16 length) override { if (_drv) _drv->sysEx(msg, length); } 
    virtual void setPitchBendRange(byte channel, uint range) override { if (_drv) _drv->setPitchBendRange(channel, range); }

    // Channel allocation functions
    MidiChannel *allocateChannel() override;
    MidiChannel *getPercussionChannel() override;

protected:
    IMuseChannel_Midi *getPart(int number);
    virtual void createChannels();
    virtual void createParts();
    virtual void releaseChannels();

    MidiDriver *_drv;
    const bool _newSystem;
    byte _numChannels;
    byte _numVoices;
    IMuseChannel_Midi **_imsParts;

private:
    virtual void initDevice();
    void initRolandGSMode();
    virtual void deinitDevice();

    void setNoteFlag(byte chan, byte note) { if (_notesPlaying && chan < 16 && note < 128) _notesPlaying[note] |= (1 << chan); }
    void clearNoteFlag(byte chan, byte note) { if (_notesPlaying && chan < 16 && note < 128) _notesPlaying[note] &= ~(1 << chan); }
    bool queryNoteFlag(byte chan, byte note) const { return (_notesPlaying && chan < 16 && note < 128) ? _notesPlaying[note] & (1 << chan) : false; }
    void setSustainFlag(byte chan, byte note) { if (_notesSustained && chan < 16 && note < 128) _notesSustained[note] |= (1 << chan); }
    void clearSustainFlag(byte chan, byte note) { if (_notesSustained && chan < 16 && note < 128) _notesSustained[note] &= ~(1 << chan); }
    bool querySustainFlag(byte chan, byte note) const { return (_notesSustained && chan < 16 && note < 128) ? _notesSustained[note] & (1 << chan) : false; }

    const bool _gsMode;

    ChannelNode *_idleChain;
    ChannelNode *_activeChain;

    uint16 *_notesPlaying;
    uint16 *_notesSustained;
};

class IMuseDriver_MT32 final : public IMuseDriver_GMidi {
    friend class IMuseChannel_MT32;
public:
    IMuseDriver_MT32(MidiDriver::DeviceHandle dev, bool newSystem);
    ~IMuseDriver_MT32() override {}

private:
    void initDevice() override;
    void deinitDevice() override;
    void createChannels() override;
    void createParts() override;
    void releaseChannels() override;

    // Convenience function that allows to send the sysex message with the exact same arguments as they are used in the original drivers.
    void sendMT32Sysex(uint32 addr, const byte *data, uint32 dataSize);

    ChannelNode *_hwRealChain;

    const byte *_programsMapping;
};

} // End of namespace Scumm

#endif