source: orxonox.OLD/branches/terrain.older/src/lib/sound/sound_engine.cc @ 10765

/*
   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_SOUND

#include "sound_engine.h"

#include "class_list.h"

#include "p_node.h"
#include "util/loading/resource_manager.h"
#include "debug.h"
#include "util/preferences.h"
#include "globals.h"

namespace OrxSound
{

  //////////////////
  /* SOUND-ENGINE */
  //////////////////
  /**
   * @brief standard constructor
  */
  SoundEngine::SoundEngine ()
  {
    this->setClassID(CL_SOUND_ENGINE, "SoundEngine");
    this->setName("SoundEngine");

    this->listener = NULL;
    this->bufferList = NULL;
    this->sourceList = NULL;

    this->device = NULL;
    this->context = NULL;

    this->maxSourceCount = 32;

    this->effectsVolume = .80;
    this->musicVolume = .75;

    this->sourceMutex = SDL_CreateMutex();
  }

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

  /**
   * @brief standard destructor
   */
  SoundEngine::~SoundEngine ()
  {
    // deleting all the SoundSources
    if(this->sourceList != NULL)
    {
      while (this->sourceList->size() > 0)
        delete static_cast<SoundSource*>(this->sourceList->front());
    }

    while(!this->ALSources.empty())
    {
      if (alIsSource(this->ALSources.top()))
      {
        alDeleteSources(1, &this->ALSources.top());
        SoundEngine::checkError("Deleting Source", __LINE__);
      }
      else
        PRINTF(1)("%d is not a Source\n", this->ALSources.top());

      this->ALSources.pop();
    }

    // deleting all the SoundBuffers
    if (this->bufferList != NULL)
    {
      while(this->bufferList->size() > 0)
        ResourceManager::getInstance()->unload(static_cast<SoundBuffer*>(this->bufferList->front()));
    }

    // removing openAL from AudioResource
    //! @todo this should be terminated through alc
    //alutExit();

    SDL_DestroyMutex(this->sourceMutex);

    SoundEngine::singletonRef = NULL;
  }

  /**
   * @brief loads the settings of the SoundEngine from an ini-file
   */
  void SoundEngine::loadSettings()
  {
    MultiType channels = Preferences::getInstance()->getString(CONFIG_SECTION_AUDIO, CONFIG_NAME_AUDIO_CHANNELS, "32");
    this->maxSourceCount = channels.getInt();

    MultiType effectsVolume = Preferences::getInstance()->getString(CONFIG_SECTION_AUDIO, CONFIG_NAME_EFFECTS_VOLUME, "80");
    this->effectsVolume = effectsVolume.getFloat()/100.0;

    MultiType musicVolume = Preferences::getInstance()->getString(CONFIG_SECTION_AUDIO, CONFIG_NAME_MUSIC_VOLUME, "75");
    this->musicVolume = musicVolume.getFloat()/100.0;
  }

  /**
   * @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 std::string& fileName, PNode* sourceNode)
  {
    SoundBuffer* buffer = NULL;
    if (!fileName.empty())
    {
      buffer= (SoundBuffer*)ResourceManager::getInstance()->load(fileName, WAV, RP_LEVEL);
      if (buffer == NULL)
        PRINTF(2)("Wav-Sound %s could not be loaded onto new Source\n", fileName.c_str());
    }
    return new SoundSource(sourceNode, buffer);
  }

  /**
   * @brief Sets the doppler values of openAL
   * @param dopplerFactor the extent of the doppler-effect
   * @param dopplerVelocity the Speed the sound travels
  */
  void SoundEngine::setDopplerValues(ALfloat dopplerFactor, ALfloat dopplerVelocity)
  {
    alDopplerFactor(dopplerFactor);
    this->checkError("Setting Doppler Factor", __LINE__);

    alDopplerVelocity(dopplerVelocity);
    this->checkError("Setting Doppler Velocity", __LINE__);
  }


  /**
   * @brief retrieves an OpenAL Source from the availiable Sources.
   * @param source the Source to fill with the Value.
   */
  void SoundEngine::popALSource(ALuint& source)
  {
    assert (source == 0);
    /// @TODO try to create more sources if needed
    if (!this->ALSources.empty())
    {
      SDL_mutexP(this->sourceMutex);
      source = this->ALSources.top();
      this->ALSources.pop();
      SDL_mutexV(this->sourceMutex);
    }
  }


  /**
   * @brief Pushes an OpenAL Source back into the Stack of known sources
   * @param source the Source to push onto the top of the SourceStack
   */
  void SoundEngine::pushALSource(ALuint& source)
  {
    if (source != 0)
    {
      SDL_mutexP(this->sourceMutex);
      this->ALSources.push(source);
      SDL_mutexV(this->sourceMutex);
    }
  };


  /**
   * @brief updates all The positions, Directions and Velocities of all Sounds
   */
  void SoundEngine::update()
  {
    // 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);
      SoundEngine::checkError("SoundEngine::update() - Listener Error", __LINE__);
    }
    else
      PRINTF(2)("no listener defined\n");

    // updating all the Sources positions
    if (likely(this->sourceList != NULL || (this->sourceList = ClassList::getList(CL_SOUND_SOURCE)) != NULL))
    {
      std::list<BaseObject*>::const_iterator sourceIT;
      SoundSource* source;
      for (sourceIT = this->sourceList->begin(); sourceIT != this->sourceList->end(); sourceIT++)
      {
        source = static_cast<SoundSource*>(*sourceIT);
        if (source->isPlaying())
        {
          int play = 0x000;
          alGetSourcei(source->getID(), AL_SOURCE_STATE, &play);
          if (DEBUG_LEVEL > 2)
            SoundEngine::checkError("SoundEngine::update() Play", __LINE__);
          if(play == AL_PLAYING)
          {
            if (likely(source->getNode() != NULL))
            {
              alSource3f(source->getID(), AL_POSITION,
                         source->getNode()->getAbsCoor().x,
                         source->getNode()->getAbsCoor().y,
                         source->getNode()->getAbsCoor().z);
              if (DEBUG_LEVEL > 2)
                SoundEngine::checkError("SoundEngine::update() Set Source Position", __LINE__);
              alSource3f(source->getID(), AL_VELOCITY,
                         source->getNode()->getVelocity().x,
                         source->getNode()->getVelocity().y,
                         source->getNode()->getVelocity().z);
              if (DEBUG_LEVEL > 2)
                SoundEngine::checkError("SoundEngine::update() Set Source Velocity", __LINE__);
            }
          }
          else
          {
            source->stop();
          }
        }
      }
    }
    SoundEngine::checkError("SoundEngine::update()", __LINE__);
  }


  /**
   *  initializes Audio in general
  */
  bool SoundEngine::initAudio()
  {
    //   ALenum result;
    //   PRINTF(3)("Initialisazing openAL sound engine\n");
    //   const char* defaultDevice =(const char*) alcGetString(NULL, ALC_DEFAULT_DEVICE_SPECIFIER);
    //   const char* deviceList = (const char*)alcGetString(NULL,ALC_DEVICE_SPECIFIER);
    //   const char* devWalk = deviceList;
    //   //  if (alcIsExtensionPresent(NULL, (const ALCchar*)"ALC_ENUMERATION_EXT") == AL_TRUE)
    //   { // try out enumeration extension
    //     PRINTF(3)("Enumeration-extension found\n");
    //
    //     PRINTF(3)("Default device: %s\n", defaultDevice);
    //     do
    //     {
    //       PRINTF(3)("%s\n", devWalk);
    //       devWalk += strlen(devWalk)+1;
    //     }
    //     while (devWalk[0] != '\0');
    //  }

    // INITIALIZING THE DEVICE:
    //   char deviceName[] =
    //   #ifdef __WIN32__
    //     "Direct3D";
    //   #else
    //     "'( ( devices '( native null ) ) )";
    //   #endif

    this->device = alcOpenDevice(NULL);
    this->checkALCError("opening Device", __LINE__);

    PRINTF(4)("Audio-Specifier: %s\n", (const char*)alcGetString(this->device, ALC_DEVICE_SPECIFIER));
    PRINTF(4)("Audio-Extensions: %s\n", (const char*)alcGetString(this->device, ALC_EXTENSIONS));


    this->context = alcCreateContext(this->device, NULL);
    this->checkALCError("creating Context", __LINE__);

    alcMakeContextCurrent(this->context);
    this->checkALCError("making Context Current", __LINE__);
    // #endif

    this->setDopplerValues(SOUND_DOPPLER_FACTOR, SOUND_DOPPLER_VELOCITY);
    this->allocateSources(this->maxSourceCount);
    this->checkError("Allocating Sources", __LINE__);

    return true;
  }


  /**
   * Allocates openAL sources
   * @param count how many sources to allocate
   * @returns true on success, false if at least one source could not be allocated
   */
  bool SoundEngine::allocateSources(unsigned int count)
  {
    unsigned int failCount = 0;
    for (unsigned int i = 0; i < count; i++)
    {
      ALuint source = 0;

      alGenSources(1, &source);
      this->checkError("allocate Source", __LINE__);
      if (!alIsSource(source))
      {
        PRINTF(5)("not allocated Source\n");
        failCount++;
        continue;
      }

      alSourcef (source, AL_PITCH,    1.0      );
      alSourcef (source, AL_GAIN,     this->getEffectsVolume() );
      alSourcei (source, AL_LOOPING,  AL_FALSE );
      this->ALSources.push(source);
    }
    if (failCount == 0)
      return true;
    else
    {
      PRINTF(2)("Failed to allocate %d of %d SoundSources\n", failCount, count);
      return false;
    }
  }

  /**
   * @brief checks for an OpenAL error
   * @param error the ErrorMessage to display
   * @param line on what line did the error occure.
   */
  bool SoundEngine::checkError(const std::string& error, unsigned int line)
  {
    ALenum errorCode;
    if ((errorCode = alGetError()) != AL_NO_ERROR)
    {
      PRINTF(1)("Error %s (line:%d): '%s'\n", error.c_str(), line, SoundEngine::getALErrorString(errorCode));
      return false;
    }
    else
      return true;
  }

  /**
   * @brief check for an ALC error.
   * @brief error the Error-String to display
   * @param line on that line, the error occured (debugging mode).
   */
  bool SoundEngine::checkALCError(const std::string& error, unsigned int line)
  {
    ALenum errorCode;
    if ((errorCode = alcGetError(this->device)) != ALC_NO_ERROR)
    {
      PRINTF(1)("Error %s (line:%d): '%s'\n", error.c_str(), line, SoundEngine::getALCErrorString(errorCode));
      return false;
    }
    else
      return true;
  }



  void SoundEngine::listDevices()
  {
    printf("%s\n",(const char*)alcGetString(NULL, ALC_DEVICE_SPECIFIER));
  }

  /**
   *  Transforms AL-errors into something readable
   * @param err The error found
  */
  const char* SoundEngine::getALErrorString(ALenum err)
  {
    switch(err)
    {
      default:
      case AL_NO_ERROR:
        return ("AL_NO_ERROR");
      case AL_INVALID_NAME:
        return ("AL_INVALID_NAME");
      case AL_INVALID_ENUM:
        return ("AL_INVALID_ENUM");
      case AL_INVALID_VALUE:
        return ("AL_INVALID_VALUE");
      case AL_INVALID_OPERATION:
        return ("AL_INVALID_OPERATION");
      case AL_OUT_OF_MEMORY:
        return ("AL_OUT_OF_MEMORY");
    };
  }


  const char* SoundEngine::getALCErrorString(ALenum err)
  {
    switch(err)
    {
      default:
      case ALC_NO_ERROR:
        return ("AL_NO_ERROR");
      case ALC_INVALID_DEVICE:
        return ("ALC_INVALID_DEVICE");
      case ALC_INVALID_CONTEXT:
        return("ALC_INVALID_CONTEXT");
      case ALC_INVALID_ENUM:
        return("ALC_INVALID_ENUM");
      case ALC_INVALID_VALUE:
        return ("ALC_INVALID_VALUE");
      case ALC_OUT_OF_MEMORY:
        return("ALC_OUT_OF_MEMORY");
    };
  }
}