Method CalcEnvelope

XBOBTFF/FeedbackXBOEffect.cpp:138–167

---------------------------------------------------------------------------------------------- CalcEnvelope ----------------------------------------------------------------------------------------------

// CalcEnvelope
//----------------------------------------------------------------------------------------------
void FeedbackXBOEffect::CalcEnvelope(ULONG Duration, ULONG CurrentPos, LONG *NormalRate, LONG *AttackLevel, LONG *FadeLevel)
{
	if( ( DiEffect.dwFlags & FFEP_ENVELOPE ) && DiEffect.lpEnvelope != NULL )
	{
		// Calculate attack factor
		LONG	AttackRate	= 0;
		ULONG	AttackTime	= max( (DWORD)1, DiEnvelope.dwAttackTime / 1000 );
		if (CurrentPos < AttackTime)
		{
			AttackRate	= ( AttackTime - CurrentPos ) * 100 / AttackTime;
		}
		
		// Calculate fade factor
		LONG	FadeRate	= 0;
		ULONG	FadeTime	= max( (DWORD)1, DiEnvelope.dwFadeTime / 1000 );
		ULONG	FadePos		= Duration - FadeTime;
		if (FadePos < CurrentPos)
		{
			FadeRate	= ( CurrentPos - FadePos ) * 100 / FadeTime;
		}
		
		*NormalRate		= 100 - AttackRate - FadeRate;
		*AttackLevel	= DiEnvelope.dwAttackLevel * AttackRate;
		*FadeLevel		= DiEnvelope.dwFadeLevel * FadeRate;
	} else {
		*NormalRate		= 100;
		*AttackLevel	= 0;
		*FadeLevel		= 0;
	}
}

void FeedbackXBOEffect::CalcForce(ULONG Duration, ULONG CurrentPos, LONG NormalRate, LONG AttackLevel, LONG FadeLevel, LONG * NormalLevel)
{