Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: Simple moving average class
//
// $NoKeywords: $
//
//
//=============================================================================//
#ifndef MOVING_AVERAGE_H
#define MOVING_AVERAGE_H
#ifdef _WIN32
#pragma once
#endif
#include "tier0/platform.h"
#include "tier0/basetypes.h"
template<uint32 TBufferSize> class CUtlMovingAverage
{
public:
CUtlMovingAverage() :
m_nValuesPushed( 0 ),
m_flTotal( 0.0f )
{
}
void Reset()
{
m_nValuesPushed = 0;
m_flTotal = 0.0f;
}
uint32 GetTotalValuesPushed() const
{
return m_nValuesPushed;
}
float GetAverage( )
{
uint n = MIN( TBufferSize, m_nValuesPushed );
return n ? ( m_flTotal / static_cast<double>( n ) ) : 0.0f;
}
void GetAverageAndAbsRange( float *pflOutAverage, float *pflOutAbsRange, float *pflMinTime, float *pflMaxTime )
{
if ( m_nValuesPushed == 0 )
{
*pflOutAverage = 0;
*pflOutAbsRange = 0;
*pflMinTime = 0;
*pflMaxTime = 0;
return;
}
*pflOutAverage = GetAverage();
const int nNumValues = MIN( m_nValuesPushed, TBufferSize );
float flAbsRange = 0;
float flMinTime = 9e+9;
float flMaxTime = 0;
for ( int i = 0; i < nNumValues; ++i )
{
float flDif = ( m_Buffer[i] - *pflOutAverage );
flAbsRange = MAX( flAbsRange, abs( flDif ) );
flMinTime = MIN( flMinTime, m_Buffer[i] );
flMaxTime = MAX( flMaxTime, m_Buffer[i] );
}
*pflOutAbsRange = flAbsRange;
*pflMinTime = flMinTime;
*pflMaxTime = flMaxTime;
}
void PushValue( float v )
{
uint nIndex = m_nValuesPushed % TBufferSize;
if ( m_nValuesPushed >= TBufferSize )
{
m_flTotal = MAX( m_flTotal - m_Buffer[nIndex], 0.0f );
}
m_flTotal += v;
m_Buffer[nIndex] = v;
m_nValuesPushed++;
if ( UINT_MAX == m_nValuesPushed )
{
Reset();
}
}
private:
float m_Buffer[TBufferSize];
uint32 m_nValuesPushed;
double m_flTotal;
};
#endif // MOVING_AVERAGE_H