Time-dependent light effects

void Swarm::registerLights(LightManager *lm,bool lightingScene)
{
   //Don't want to cause changes to the scene lightmap
   if(lightingScene)
      return;

   //Last render time
   S32 time = Sim::getCurrentTime();
   //Time in seconds since last render
	F32 elapsedTime = (time - mLastLightTime) * 0.001f;
	mLastLightTime = time;

   switch(mDataBlock->lightType)
   {
   case SwarmData::Constant:
      {
         mLightIntensity = 1.0f;
         break;
      }

   case SwarmData::Pulsing:
      {
         //Get the radian angle of our light intensity
         F32 current = mAsin(mLightIntensity);
         //Add to it depending on our period
         current += M_2PI_F / (mDataBlock->lightPeriod * elapsedTime);
         //Constrain it to 0...2PI
         while(current > M_2PI_F)
            current -= M_2PI_F;
         //Put it back in the range 0...1
         mLightIntensity = 0.5f + 0.5f * mSin(current);
         break;
      }

   case SwarmData::Flickering:
      {
         //lightPeriod now gives the average number of flickers per second
         bool current = (mLightIntensity > 0.0f);
         MRandomLCG random(Platform::getRealMilliseconds());
         if(random.randF() <= mDataBlock->lightPeriod * elapsedTime)
            current = !current; //Switch light state
         //Set intensity based on current
         mLightIntensity = current? 1.0f : 0.0f;
         break;
      }

   default:
      return;
   }

   mLight.mColor = mDataBlock->lightColour * mLightIntensity;
   mLight.mColor.clamp();
   mLight.mType = LightInfo::Point;
   mLight.mRadius = mDataBlock->lightRadius;

   mLight.mPos = getBoxCenter();

   lm->sgRegisterGlobalLight(&mLight);
}