music.hpp

// By Emil Ernerfeldt 2014-2016
// LICENSE:
//   This software is dual-licensed to the public domain and under the following
//   license: you are granted a perpetual, irrevocable license to copy, modify,
//   publish, and distribute this file as you see fit.
// HISTORY:
//   Created in 2014 for Ghostel

#pragma once

#include <memory>

namespace emilib {

class Music
{
public:
    explicit Music(const char* path);
    ~Music();
    Music(Music&&);
    Music& operator=(Music&&);
    Music(const Music&) = delete;
    Music& operator=(const Music&) = delete;

    const std::string& path() const;

    void update(float dt); 

    void fade_in(float duration = 0.1f);
    void fade_out_and_pause(float duration = 0.1f);

    void play();
    void pause();
    void stop();

    void set_volume(float volume);
    void set_muted(bool muted);

private:
    struct Fade
    {
        float target; // 0 or _volume
        float speed;
    };

    struct MusicImpl;

    std::unique_ptr<MusicImpl> _impl;
    float                      _volume = 1;
    bool                       _has_fade = false;
    Fade                       _fade;
};

} // namespace emilib