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movieobjects/dmebalancetostereocalculatoroperator.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// The expression operator class - scalar math calculator
+// for a good list of operators and simple functions, see:
+//   \\fileserver\user\MarcS\boxweb\aliveDistLite\v4.2.0\doc\alive\functions.txt
+// (although we'll want to implement elerp as the standard 3x^2 - 2x^3 with rescale)
+//
+//=============================================================================
+#include "movieobjects/dmebalancetostereocalculatoroperator.h"
+#include "movieobjects/dmechannel.h"
+#include "movieobjects_interfaces.h"
+#include "datamodel/dmelementfactoryhelper.h"
+#include "datamodel/dmattribute.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+//-----------------------------------------------------------------------------
+// Expose this class to the scene database 
+//-----------------------------------------------------------------------------
+IMPLEMENT_ELEMENT_FACTORY( DmeBalanceToStereoCalculatorOperator, CDmeBalanceToStereoCalculatorOperator );
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+void CDmeBalanceToStereoCalculatorOperator::OnConstruction()
+{
+	m_result_left.Init( this, "result_left" );
+	m_result_right.Init( this, "result_right" );
+	m_result_multi.Init( this, "result_multi" );
+
+	m_value.Init( this, "value" );
+	m_balance.InitAndSet( this, "balance", 0.5f );
+	m_multilevel.InitAndSet( this, "multilevel", 0.5f );
+
+	m_bSpewResult.Init( this, "spewresult" );
+
+	m_flDefaultValue = FLT_MAX;
+}
+
+void CDmeBalanceToStereoCalculatorOperator::OnDestruction()
+{
+}
+
+void CDmeBalanceToStereoCalculatorOperator::GetInputAttributes ( CUtlVector< CDmAttribute * > &attrs )
+{
+	attrs.AddToTail( m_value.GetAttribute() );
+	attrs.AddToTail( m_balance.GetAttribute() );
+	attrs.AddToTail( m_multilevel.GetAttribute() );
+}
+
+void CDmeBalanceToStereoCalculatorOperator::GetOutputAttributes( CUtlVector< CDmAttribute * > &attrs )
+{
+	attrs.AddToTail( m_result_left.GetAttribute() );
+	attrs.AddToTail( m_result_right.GetAttribute() );
+	attrs.AddToTail( m_result_multi.GetAttribute() );
+}
+
+float CDmeBalanceToStereoCalculatorOperator::ComputeDefaultValue()
+{
+	// NOTE: This is a total hack, which we expect to remove soon, when the balance work is done.
+	const static UtlSymId_t symToElement = g_pDataModel->GetSymbol( "toElement" );
+	CDmeChannel *pChannel = FindReferringElement<CDmeChannel>( this, symToElement );
+	if ( !pChannel )
+		return 0.0f;
+
+	CDmElement *pControl = pChannel->GetFromElement();
+	if ( !pControl )
+		return 0.0f;
+
+	return pControl->GetValue<float>( "defaultValue" );
+}
+
+void CDmeBalanceToStereoCalculatorOperator::Operate()
+{ 
+	if ( m_flDefaultValue == FLT_MAX )
+	{
+		m_flDefaultValue = ComputeDefaultValue();
+	}
+
+	float flValue = m_value - m_flDefaultValue;
+	if ( m_balance > 0.5f )
+	{
+		m_result_right = m_value;
+		m_result_left = ( ( 1.0f - m_balance ) / 0.5f ) * flValue + m_flDefaultValue;
+	}
+	else
+	{
+		m_result_right = ( m_balance / 0.5f ) * flValue + m_flDefaultValue;
+		m_result_left = m_value;
+	}
+
+	m_result_multi = m_multilevel;
+
+	if ( m_bSpewResult )
+	{
+		Msg( "%s = l('%f') r('%f') m('%f')\n", GetName(), (float)m_result_left, (float)m_result_right, (float)m_result_multi );
+	}
+}
+
+void CDmeBalanceToStereoCalculatorOperator::SetSpewResult( bool state )
+{
+	m_bSpewResult = state;
+}