Method _assignVoices

Engine/source/sfx/sfxSystem.cpp:898–988

//-----------------------------------------------------------------------------

void SFXSystem::_assignVoices()
{
   AssertFatal( getNumListeners() == 1, "SFXSystem::_assignVoices() - must only have a single listener" );
   PROFILE_SCOPE( SFXSystem_AssignVoices );

   mStatNumVoices = 0;
   mStatNumCulled = 0;
   
   if( !mDevice )
      return;
      
   // Sort the sources in the SFX source set by priority.  This also
   // updates each soures effective volume first.
   
   _sortSounds( getListener() );

   // We now make sure that the sources closest to the 
   // listener, the ones at the top of the source list,
   // have a device buffer to play thru.
   
   mStatNumCulled = 0;
   for( SFXSoundVector::iterator iter = mSounds.begin(); iter != mSounds.end(); ++ iter )
   {
      SFXSound* sound = *iter;

      // Non playing sources (paused or stopped) are at the
      // end of the vector, so when i encounter one i know 
      // that nothing else in the vector needs buffer assignment.
      
		if( !sound->isPlaying() )
         break;

      // If the source is outside it's max range we can
      // skip it as well, so that we don't waste cycles
      // setting up a buffer for something we won't hear.
      
      if( sound->getAttenuatedVolume() <= 0.0f )
      {
         ++ mStatNumCulled;
         continue;
      }

      // If the source has a voice then we can skip it.
      
      if( sound->hasVoice() )
         continue;

      // Ok let the device try to assign a new voice for 
      // this source... this may fail if we're out of voices.
      
      if( sound->_allocVoice( mDevice ) )
         continue;

      // The device couldn't assign a new voice, so we go through
      // local priority sounds and try to steal a voice.
      
      for( SFXSoundVector::iterator hijack = mSounds.end() - 1; hijack != iter; -- hijack )
      {