text: // MIT License
  //
  // This file is part of SpaceGame.
  // Copyright (c) 2014-2018 Miika Pelkonen
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in all
  // copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  // SOFTWARE.
  
  #ifndef SPACEGAME_MIXER_H
  #define SPACEGAME_MIXER_H
  
  
  #include <vector>
  
  class Mixer {
      friend class Tile2D;
      friend class AudioSource;
  
  private:
      Mixer() = default;
      ~Mixer();
      void init();
  
      const int MIXING_CHANNELS = 32;
      std::vector<bool> channelReservations_;
  
      int reserveChannel_();
      void freeChannel_(int channel);
  };
  
  
  #endif //SPACEGAME_MIXER_H
  