Method Calc

XBOBTFF/FeedbackXBOEffect.cpp:44–133

---------------------------------------------------------------------------------------------- Calc ----------------------------------------------------------------------------------------------

// Calc
//----------------------------------------------------------------------------------------------
LONG FeedbackXBOEffect::Calc(LONG *LeftLevel, LONG *RightLevel, LONG *ltLevel, LONG *rtLevel)
{
	CFTimeInterval Duration = 0;
	if(DiEffect.dwDuration != FF_INFINITE) {
		Duration = max(1., DiEffect.dwDuration / 1000.) / 1000.;
	} else {
		Duration = DBL_MAX;
	}
	double BeginTime = StartTime + ( DiEffect.dwStartDelay / 1000. / 1000.);
	double EndTime  = DBL_MAX;
	if (PlayCount != -1)
	{
		EndTime = BeginTime + Duration * PlayCount;
	}
	double CurrentTime = CurrentTimeUsingMach();
	
	if (Status == FFEGES_PLAYING && BeginTime <= CurrentTime && CurrentTime <= EndTime)
	{
		// Used for force calculation
		LONG NormalLevel;
		LONG WorkLeftLevel;
		LONG WorkRightLevel;
		LONG WorkLTLevel;
		LONG WorkRTLevel;

		// Used for envelope calculation
		LONG NormalRate;
		LONG AttackLevel;
		LONG FadeLevel;
		
		CalcEnvelope((ULONG)(Duration*1000)
					 ,(ULONG)(fmod(CurrentTime - BeginTime, Duration)*1000)
					 ,&NormalRate
					 ,&AttackLevel
					 ,&FadeLevel);
		
		// CustomForce allows setting each channel separately
		if(CFEqual(Type, kFFEffectType_CustomForce_ID)) {
			if((CurrentTimeUsingMach() - LastTime)*1000*1000 < DiCustomForce.dwSamplePeriod) {
				return -1;
			}
			else {
				if (DiCustomForce.cChannels == 2) {
					WorkLeftLevel = ((DiCustomForce.rglForceData[2*Index] * NormalRate + AttackLevel + FadeLevel) / 100) * DiEffect.dwGain / 10000;
					WorkRightLevel = ((DiCustomForce.rglForceData[2*Index + 1] * NormalRate + AttackLevel + FadeLevel) / 100) * DiEffect.dwGain / 10000;
					WorkLTLevel = 0;
					WorkRTLevel = 0;
					//fprintf(stderr, "L:%d; R:%d\n", WorkLeftLevel, WorkRightLevel);
					Index = (Index + 1) % (DiCustomForce.cSamples/2);
					LastTime = CurrentTimeUsingMach();
				} else {
					WorkLeftLevel = ((DiCustomForce.rglForceData[4*Index] * NormalRate + AttackLevel + FadeLevel) / 100) * DiEffect.dwGain / 10000;
					WorkRightLevel = ((DiCustomForce.rglForceData[4*Index + 1] * NormalRate + AttackLevel + FadeLevel) / 100) * DiEffect.dwGain / 10000;
					WorkLTLevel = ((DiCustomForce.rglForceData[4*Index + 2] * NormalRate + AttackLevel + FadeLevel) / 100) * DiEffect.dwGain / 10000;
					WorkRTLevel = ((DiCustomForce.rglForceData[4*Index + 3] * NormalRate + AttackLevel + FadeLevel) / 100) * DiEffect.dwGain / 10000;
					//fprintf(stderr, "L:%d; R:%d\n", WorkLeftLevel, WorkRightLevel);
					Index = (Index + 1) % (DiCustomForce.cSamples/4);
					LastTime = CurrentTimeUsingMach();