Method Calc

Feedback360/Feedback360Effect.cpp:60–129

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

// Calc
//----------------------------------------------------------------------------------------------
LONG Feedback360Effect::Calc(LONG *LeftLevel, LONG *RightLevel)
{
    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;

        // 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 {
                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;
                //fprintf(stderr, "L:%d; R:%d\n", WorkLeftLevel, WorkRightLevel);
                Index = (Index + 1) % (DiCustomForce.cSamples/2);
                LastTime = CurrentTimeUsingMach();
            }
        }
        // Regular commands treat controller as a single output (both channels are together as one)
        else {
            CalcForce(
                      (ULONG)(Duration*1000)
                      ,(ULONG)(fmod(CurrentTime - BeginTime, Duration)*1000)
                      ,NormalRate
                      ,AttackLevel
                      ,FadeLevel
                      ,&NormalLevel );
            //fprintf(stderr, "DeltaT %f\n", CurrentTime - BeginTime);
            //fprintf(stderr, "Duration %f; NormalRate: %d; AttackLevel: %d; FadeLevel: %d\n", Duration, NormalRate, AttackLevel, FadeLevel);