source: orxonox.OLD/branches/qt_gui/src/lib/sound/sound_source.cc @ 7629

/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   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 2, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: ...
*/

#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_SOUND

#include "sound_source.h"
#include "sound_engine.h"

#include "alincl.h"
#include "compiler.h"

namespace OrxSound
{
  /**
   * @brief creates a SoundSource at position sourceNode with the SoundBuffer buffer
   */
  SoundSource::SoundSource(const PNode* sourceNode, const SoundBuffer* buffer)
  {
    this->setClassID(CL_SOUND_SOURCE, "SoundSource");

    // adding the Source to the SourcesList of the SoundEngine
    this->buffer = buffer;
    this->sourceNode = sourceNode;
    this->resident = false;

    this->sourceID = 0;
    this->bPlay = false;
  }


  /**
   * @brief construct a SoundSource out of the another soundSource
   * @param source the Source to create this source from.
   *
   * Copies the buffer from source to this Source.
   * Acquires a new SourceID if source is Playing.
   */
  SoundSource::SoundSource(const SoundSource& source)
  {
    this->setClassID(CL_SOUND_SOURCE, "SoundSource");

    // adding the Source to the SourcesList of the SoundEngine
    this->buffer = source.buffer;
    this->sourceNode = source.sourceNode;
    this->resident = source.resident;

    this->sourceID = 0;
    if (source.bPlay == true)
    {
      this->bPlay = true;
      SoundEngine::getInstance()->popALSource(this->sourceID);
    }
    else
      this->bPlay = false;
  }


  /**
   * @brief paste a copy of the source into this Source.
   * @param source the SoundSource to paste into this one.
   * @returns a Reference to this Source.
   *
   */
  SoundSource& SoundSource::operator=(const SoundSource& source)
  {
    this->buffer = source.buffer;
    this->sourceNode = sourceNode;
    this->resident = source.resident;

    if (source.bPlay)
      this->play();
    else
      this->stop();
  }


  /**
   * @brief compares two Sources with each other.
   * @param source the Source to compare against this One.
   * Two Sources are the same, if the PNodes match, and the Sound Played are the same.
   * The alSource must not match, because no two Sources can have the same alSource.
   */
  bool SoundSource::operator==(const SoundSource& source)
  {
    return (this->buffer == source.buffer &&
            this->bPlay == source.bPlay &&
            this->sourceNode == source.sourceNode);
  }


  /**
   * @brief deletes a SoundSource
   */
  SoundSource::~SoundSource()
  {
    this->stop();
    if (this->sourceID != 0)
      SoundEngine::getInstance()->pushALSource(this->sourceID);
  }


  /**
   * @brief Plays back a SoundSource
   */
  void SoundSource::play()
  {
    if (this->buffer && this->retrieveSource())
    {
      if (this->bPlay)
        alSourceStop(this->sourceID);
      alSourcei (this->sourceID, AL_BUFFER, this->buffer->getID());
      alSourcePlay(this->sourceID);

      if (DEBUG >= 3)
        SoundEngine::checkError("Play Source", __LINE__);
      this->bPlay = true;
    }
  }


  /**
   * @brief Plays back buffer on this Source
   * @param buffer the buffer to play back on this Source
   */
  void SoundSource::play(const SoundBuffer* buffer)
  {
    if (!this->retrieveSource())
    {
      PRINTF(3)("No more Free sources (You might consider raising the Source-Count).\n");
      return;
    }

    alSourceStop(this->sourceID);
    alSourcei (this->sourceID, AL_BUFFER, buffer->getID());
    alSourcePlay(this->sourceID);

    if (unlikely(this->buffer != NULL))
      alSourcei (this->sourceID, AL_BUFFER, this->buffer->getID());
    this->bPlay = true;

    if (DEBUG >= 3)
      SoundEngine::checkError("Play Source", __LINE__);
  }


  /**
   * @brief Stops playback of a SoundSource
   */
  void SoundSource::stop()
  {
    this->bPlay = false;
    if (this->sourceID != 0)
    {
      alSourceStop(this->sourceID);
      if (DEBUG >= 3)
        SoundEngine::checkError("StopSource", __LINE__);
      alSourcei(this->sourceID, AL_BUFFER, 0);
      if (!this->resident)
        SoundEngine::getInstance()->pushALSource(this->sourceID);
      this->sourceID = 0;
    }
  }


  /**
   * @brief Pauses Playback of a SoundSource
   */
  void SoundSource::pause()
  {
    alSourcePause(this->sourceID);
    if (DEBUG >= 3)
      SoundEngine::checkError("Pause Source", __LINE__);
  }


  /**
   * @brief Rewinds Playback of a SoundSource
   */
  void SoundSource::rewind()
  {
    alSourceRewind(this->sourceID);

    if (DEBUG >= 3)
      SoundEngine::checkError("Rewind Source", __LINE__);
  }


  /**
   * @brief sets the RolloffFactor of the Sound emitted from the SoundSource
   * @param rolloffFactor The Factor described
   *
   * this tells openAL how fast the Sounds decay outward from the Source
   */
  void SoundSource::setRolloffFactor(ALfloat rolloffFactor)
  {
    alSourcef(this->sourceID, AL_ROLLOFF_FACTOR, rolloffFactor);

    if (DEBUG >= 3)
      SoundEngine::checkError("Set Source Rolloff-factor", __LINE__);
  }


  /**
   * @brief sets the Positional this Source should be attached to.
   * @param sourceNode the Source this is attached to.
   * If sourceNode == NULL then the Source will be centered, and Audio will be played on all channels.
   */
  void SoundSource::setSourceNode(const PNode* sourceNode)
  {
    this->sourceNode = sourceNode;
  }

  /**
   * @brief retrieve a Source.
   */
  bool SoundSource::retrieveSource()
  {
    if (this->sourceID != 0)
      return true;
    else
    {
      SoundEngine::getInstance()->popALSource(this->sourceID);
      if (this->sourceID != 0)
      {
        if (unlikely(this->sourceNode == NULL))
          resetSource(this->sourceID);
        return true;
      }
    }
    return false;
  }


  /**
   * @brief reset an alSource to its default Values.
   */
  void SoundSource::resetSource(ALuint sourceID)
  {
    alSource3f(sourceID, AL_POSITION,        0.0, 0.0, 0.0);
    alSource3f(sourceID, AL_VELOCITY,        0.0, 0.0, 0.0);
    alSource3f(sourceID, AL_DIRECTION,       0.0, 0.0, 0.0);
    alSourcef (sourceID, AL_ROLLOFF_FACTOR,  0.0          );
    //alSourcei (sourceID, AL_SOURCE_RELATIVE, AL_TRUE      );
    alSourcef (sourceID, AL_GAIN,            SoundEngine::getInstance()->getEffectsVolume());
  }
}