source: orxonox.OLD/orxonox/branches/openAL/src/lib/sound/sound_engine.cc @ 4207

/* 
   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: ...

   code has been taken from http://www.devmaster.net/articles.php?catID=6
   The code has been applied to our needs, and many things have been changed.
*/

//#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_WORLD_ENTITY

#include "sound_engine.h"

//#include <AL/alc.h> // maybe later

#include "p_node.h"
#include "list.h"
#include "resource_manager.h"
using namespace std;


//////////////////
/* SOUND-BUFFER */
//////////////////
/**
   \brief Creates a Soundbuffer out of an inputfile
   \param fileName The name of the File
*/
SoundBuffer::SoundBuffer(const char* fileName)
{
  SoundEngine::getInstance()->addBuffer(this);

  ALenum format;
  ALvoid* data;
  ALsizei freq;
  
  ALenum result;

  // generate a Buffer
  alGenBuffers(1, &this->bufferID);
  if ((result = alGetError()) != AL_NO_ERROR)
    SoundEngine::PrintALErrorString(result);

  // read in the wav data
  alutLoadWAVFile((ALbyte*)fileName, &format, &data, &this->size, &freq, &this->loop);
  if ((result = alGetError()) != AL_NO_ERROR)
    SoundEngine::PrintALErrorString(result);
  
  // send the loaded wav data to the buffer
  alBufferData(this->bufferID, format, data, this->size, freq);
  if ((result = alGetError()) != AL_NO_ERROR)
    SoundEngine::PrintALErrorString(result);

  // remove the wav data (redundant)
  alutUnloadWAV(format, data, this->size, freq);
  if ((result = alGetError()) != AL_NO_ERROR)
    SoundEngine::PrintALErrorString(result);
}

SoundBuffer::~SoundBuffer(void)
{
  SoundEngine::getInstance()->removeBuffer(this);
  alDeleteBuffers(1, &this->bufferID);
}

//////////////////
/* SOUND-SOURCE */
//////////////////
/**
   \brief creates a SoundSource at position sourceNode with the SoundBuffer buffer
*/
SoundSource::SoundSource(SoundBuffer* buffer, PNode* sourceNode)
{
  ALenum result;

  // adding the Source to the SourcesList of the SoundEngine
  SoundEngine::getInstance()->addSource(this);

  this->buffer = buffer;
  this->sourceNode = sourceNode;

  alGenSources(1, &this->sourceID);
  if ((result = alGetError()) != AL_NO_ERROR)
    SoundEngine::PrintALErrorString(result);
  alSourcei (this->sourceID, AL_BUFFER,   this->buffer->getID());
  alSourcef (this->sourceID, AL_PITCH,    1.0      );
  alSourcef (this->sourceID, AL_GAIN,     1.0      );
  alSourcei (sourceID, AL_LOOPING,  true     );
}

SoundSource::~SoundSource(void)
{
  SoundEngine::getInstance()->removeSource(this);
  alDeleteSources(1, &this->sourceID);
}


/**
   \brief Plays back a SoundSource
*/
void SoundSource::play()
{
  alSourcePlay(this->sourceID);
}

/**
   \brief Stops playback of a SoundSource
*/
void SoundSource::stop()
{
  alSourceStop(this->sourceID);
}

/**
   \brief Pauses Playback of a SoundSource
*/
void SoundSource::pause()
{
  alSourcePause(this->sourceID);
}

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

/**
   \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);
}



//////////////////
/* SOUND-ENGINE */
//////////////////
/**
   \brief standard constructor
*/
SoundEngine::SoundEngine () 
{
  this->setClassName ("SoundEngine");
   
   this->initAudio();

   this->listener = NULL;
   this->bufferList = new tList<SoundBuffer>;
   this->sourceList = new tList<SoundSource>;
}

/**
   \brief the singleton reference to this class
*/
SoundEngine* SoundEngine::singletonRef = NULL;

/**
   \returns a Pointer to this Class
*/
SoundEngine* SoundEngine::getInstance(void)
{
  if (!SoundEngine::singletonRef)
    SoundEngine::singletonRef = new SoundEngine();
  return SoundEngine::singletonRef;
}

/**
   \brief standard deconstructor

*/
SoundEngine::~SoundEngine () 
{
  SoundEngine::singletonRef = NULL;

  // deleting all the SoundSources
  tIterator<SoundSource>* sourceIterator = this->sourceList->getIterator();
  SoundSource* enumSource = sourceIterator->nextElement();
  while (enumSource)
    {
      delete enumSource;
      enumSource = sourceIterator->nextElement();
    }
  delete sourceIterator;

  // deleting all the SoundBuffers
  tIterator<SoundBuffer>* bufferIterator = this->bufferList->getIterator();
  SoundBuffer* enumBuffer = bufferIterator->nextElement();
  while (enumBuffer)
    {
      ResourceManager::getInstance()->unload(enumBuffer);
      enumBuffer = bufferIterator->nextElement();
    }
  delete bufferIterator;
}

/**
   \brief creates a new SoundSource.
   \param fileName The Name to load the SoundBuffer from
   \param sourceNode The sourceNode to bind this SoundSource to.
   \returns The newly created SoundSource

   acctualy this is nothing more than a wrapper around the ResourceManager.
*/
SoundSource* SoundEngine::createSource(const char* fileName, PNode* sourceNode)
{
  return new SoundSource((SoundBuffer*)ResourceManager::getInstance()->load(fileName, WAV, RP_LEVEL), sourceNode);
}


/**
   \brief sets The listener (normaly the Camera)
*/
void SoundEngine::setListener(PNode* listener)
{
  this->listener = listener;
}

/**
   \brief adds a SoundBuffer to the bufferList of the SoundEngine
   \param buffer The buffer to add to the bufferList
*/
void SoundEngine::addBuffer(SoundBuffer* buffer)
{
  this->bufferList->add(buffer);
}

/**
   \brief removes a SoundBuffer from the bufferList of the SoundEngine
   \param buffer The buffer to delete from the SoundEngine
*/
void SoundEngine::removeBuffer(SoundBuffer* buffer)
{
  this->bufferList->remove(buffer);
}

/**
   \brief adds a SoundSource to the sourceList of the SoundEngine
   \param source The source to add to the sourceList
*/
void SoundEngine::addSource(SoundSource* source)
{
  this->sourceList->add(source);
}

/**
   \brief removes a SoundSource from the sourceList of the SoundEngine
   \param source The source to delete from the SoundEngine
*/
void SoundEngine::removeSource(SoundSource* source)
{
  this->sourceList->remove(source);
}


/**
   \brief updates all The positions, Directions and Velocities of all Sounds
*/
void SoundEngine::update(void)
{

  // updating the Listeners Position
  if (likely(this->listener != NULL))
    {
      alListener3f(AL_POSITION,
                   this->listener->getAbsCoor().x,
                   this->listener->getAbsCoor().y,
                   this->listener->getAbsCoor().z);
      alListener3f(AL_VELOCITY,
                   this->listener->getVelocity().x,
                   this->listener->getVelocity().y,
                   this->listener->getVelocity().z);
      Vector absDirV = this->listener->getAbsDirV();
      ALfloat orientation [6] = {1,0,0, absDirV.x, absDirV.y, absDirV.z};
      alListenerfv(AL_ORIENTATION, orientation);
    }
  else
    PRINTF(2)("no listener defined\n");

  // updating all the Sources positions
  tIterator<SoundSource>* iterator = this->sourceList->getIterator();
  SoundSource* enumSource = iterator->nextElement();
  while (enumSource)
    {
      if (likely(enumSource->getNode()!=NULL))
      {
        alSource3f(enumSource->getID(), AL_POSITION,
                   enumSource->getNode()->getAbsCoor().x,
                   enumSource->getNode()->getAbsCoor().y,
                   enumSource->getNode()->getAbsCoor().z);
        alSource3f(enumSource->getID(), AL_VELOCITY,
                   enumSource->getNode()->getVelocity().x,
                   enumSource->getNode()->getVelocity().y,
                   enumSource->getNode()->getVelocity().z);
      }
      enumSource = iterator->nextElement();
    }
  delete iterator;
}

/**
   \brief Removes all the Buffers that are not anymore needed by any Sources
*/
void SoundEngine::flushUnusedBuffers(void)
{
  tIterator<SoundBuffer>* bufferIterator = this->bufferList->getIterator();
  SoundBuffer* enumBuffer = bufferIterator->nextElement();
  while (enumBuffer)
    {
      tIterator<SoundSource>* sourceIterator = this->sourceList->getIterator();
      SoundSource* enumSource = sourceIterator->nextElement();
      while (enumSource)
        {
          if (enumBuffer == enumSource->getBuffer())
            break;
          enumSource = sourceIterator->nextElement();
        }
      delete sourceIterator;
      if (enumSource == NULL)
        ResourceManager::getInstance()->unload(enumBuffer);
      enumBuffer = bufferIterator->nextElement();
    }
  delete bufferIterator;
}

/**
   \brief initializes Audio in general
*/
bool SoundEngine::initAudio(void)
{
  alutInit(NULL, 0);
  alGetError();

  alDopplerFactor(SOUND_DOPPLER_FACTOR);
  alDopplerVelocity(SOUND_DOPPLER_VELOCITY);
}

/**
   \brief Transforms AL-errors into something readable
   \param err The error found
*/
void SoundEngine::PrintALErrorString(ALenum err)
{
  switch(err)
    {
    case AL_NO_ERROR:
      PRINTF(4)("AL_NO_ERROR\n");
      break;
      
    case AL_INVALID_NAME:
      PRINTF(2)("AL_INVALID_NAME\n");
      break;

    case AL_INVALID_ENUM:
      PRINTF(2)("AL_INVALID_ENUM\n");
      break;

    case AL_INVALID_VALUE:
      PRINTF(2)("AL_INVALID_VALUE\n");
      break;

    case AL_INVALID_OPERATION:
      PRINTF(2)("AL_INVALID_OPERATION\n");
      break;

    case AL_OUT_OF_MEMORY:
      PRINTF(2)("AL_OUT_OF_MEMORY\n");
      break;
    };
}

/*
void SoundEngine::PrintALCErrorString(ALenum err)
{
  switch(err)
    {
    case ALC_NO_ERROR:
      PRINTF(4)("AL_NO_ERROR\n");
      break;

    case ALC_INVALID_DEVICE:
      PRINTF(2)("ALC_INVALID_DEVICE\n");
      break;

    case ALC_INVALID_CONTEXT:
      PRINTF(2)("ALC_INVALID_CONTEXT\n");
      break;

    case ALC_INVALID_ENUM:
      PRINTF(2)("ALC_INVALID_ENUM\n");
      break;

    case ALC_INVALID_VALUE:
      PRINTF(2)("ALC_INVALID_VALUE\n");
      break;

    case ALC_OUT_OF_MEMORY:
      PRINTF(2)("ALC_OUT_OF_MEMORY\n");
      break;
    };
}
*/