music_effect.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 ZVISION_MUSIC_NODE_H
#define ZVISION_MUSIC_NODE_H
 
#include "audio/mixer.h"
#include "math/angle.h"
#include "zvision/scripting/scripting_effect.h"
#include "zvision/sound/volume_manager.h"
#include "zvision/text/subtitle_manager.h"
 
namespace Common {
class String;
}
 
namespace ZVision {
 
class MusicNodeBASE : public ScriptingEffect {
public:
    MusicNodeBASE(ZVision *engine, uint32 key, ScriptingEffectType type) : ScriptingEffect(engine, key, type) {}
    ~MusicNodeBASE() override {}
 
    bool process(uint32 deltaTimeInMillis) override = 0;
 
    virtual void setVolume(uint8 volume) = 0;
    uint8 getVolume() {
        return _volume;
    }
    virtual void setFade(int32 time, uint8 target) = 0;
    virtual void setBalance(int8 balance);  // NB Overrides effects of setDirection()
    void setDirection(Math::Angle azimuth, uint8 magnitude = 255);  // NB Overrides effects of setBalance()
protected:
    void updateMixer();
    virtual void outputMixer() = 0;
 
    uint8 _volume = 0;
    int8 _balance = 0;
    Math::Angle _azimuth;
    uint8 _directionality;  // 0 = fully ambient, 255 = fully directional
    uint8 _volumeOut = 0;
};
 
class MusicNode : public MusicNodeBASE {
public:
    MusicNode(ZVision *engine, uint32 key, Common::Path &file, bool loop, uint8 volume);
    ~MusicNode() override;
 
    bool process(uint32 deltaTimeInMillis) override;
 
    void setVolume(uint8 volume) override;
 
    void setFade(int32 time, uint8 target) override;
 
private:
    void outputMixer() override;
    bool _loop;
    bool _fade;
    uint8 _fadeStartVol;
    uint8 _fadeEndVol;
    uint32 _fadeTime;
    uint32 _fadeElapsed; // Cumulative time since fade start
    bool _stereo;
    Audio::SoundHandle _handle;
    uint16 _sub;
    bool _loaded;
};
 
// Only used by Zork: Nemesis, for the flute and piano puzzles (tj4e and ve6f, as well as vr)
class MusicMidiNode : public MusicNodeBASE {
public:
    MusicMidiNode(ZVision *engine, uint32 key, uint8 program, uint8 note, uint8 volume);
    ~MusicMidiNode() override;
 
    bool process(uint32 deltaTimeInMillis) override;
 
    void setVolume(uint8 volume) override;
 
    void setFade(int32 time, uint8 target) override;
 
private:
    void outputMixer() override;
    int8 _chan;
    uint8 _noteNumber;
    int8 _pan;
    uint8 _prog;
};
 
class PanTrackNode : public ScriptingEffect {
public:
    PanTrackNode(ZVision *engine, uint32 key, uint32 slot, int16 pos, uint8 mag = 255, bool resetMixerOnDelete = false, bool staticScreen = false);
    ~PanTrackNode() override;
 
    bool process(uint32 deltaTimeInMillis) override;
 
private:
    uint32 _slot;
    int16 _width, _pos;
    Math::Angle _sourcePos, _viewPos;
    uint8 _mag;
    bool _resetMixerOnDelete;
    bool _staticScreen;
};
 
} // End of namespace ZVision
 
#endif