Method _updateVolume

Engine/source/sfx/sfxSource.cpp:793–920

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

void SFXSource::_updateVolume( const MatrixF& listener )
{
   if (!mDescription)
      return;

   // Handle fades (compute mFadedVolume).
      
   mFadedVolume = mPreFadeVolume;
   if( mFadeSegmentType != FadeSegmentNone )
   {
      // We have a temporary fade segment.
      
      F32 elapsed;
      if( mDescription->mIsLooping && !mDescription->mFadeLoops )
         elapsed = getElapsedPlayTime();
      else
         elapsed = getElapsedPlayTimeCurrentCycle();
      
      if( elapsed < mFadeSegmentEndPoint )
      {
         const F32 duration = mFadeSegmentEndPoint - mFadeSegmentStartPoint;
         
         if( mFadeSegmentType == FadeSegmentPlay )
         {
            const F32 time = elapsed - mFadeSegmentStartPoint;
            mFadedVolume = mFadeSegmentEase->getValue
               ( time, 0.f, mPreFadeVolume, duration );
         }
         else
         {
            // If the end-point to the ease functions is 0,
            // we'll always get out the start point.  Thus do the whole
            // thing backwards here.
            
            const F32 time = mFadeSegmentEndPoint - elapsed;
            mFadedVolume = mFadeSegmentEase->getValue
               ( time, 0.f, mPreFadeVolume, duration );
         }
      }
      else
      {
         // The fade segment has played.  Remove it.
         
         switch( mFadeSegmentType )
         {
            case FadeSegmentStop:
               stop( 0.f );
               break;
               
            case FadeSegmentPause:
               pause( 0.f );
               break;
               
            case FadeSegmentPlay: // Nothing to do.               
            default:
               break;
         }