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/*==LICENSE==*
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CyanWorlds.com Engine - MMOG client, server and tools
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Copyright (C) 2011 Cyan Worlds, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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You can contact Cyan Worlds, Inc. by email legal@cyan.com
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or by snail mail at:
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Cyan Worlds, Inc.
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14617 N Newport Hwy
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Mead, WA 99021
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*==LICENSE==*/
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#ifndef PL_AVG_H
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#define PL_AVG_H
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#include "hsConfig.h"
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#include "hsThread.h"
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#include "hsStlUtils.h"
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// A Time based Value Averaging class
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// implemented in a ring buffer
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// Values are averaged over the RingLen
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// independant of frame time
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// The ring buffer will grow to accomadate
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// as many samples as added during the Len
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// Only Accurate to kPercision (0.001) of whatever units
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// of time are used
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template <class T> class TimeBasedAvgRing
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{
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/* T must be a simple type
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If T is not a floating point type then rounding
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loss may occur when samples are interpolated
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at window boundries
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*/
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private:
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static const float kPercision;
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template <class S> class Item
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{
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private:
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T fValue;
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double fTime;
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public:
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Item() { Reset(); }
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Item(const T val, const double time) : fValue(val), fTime(time) { }
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void Reset() { fValue = 0; fTime = 0; }
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void SetValue(const T val) { fValue = val; }
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void SetTime(const double time) { fTime = time; }
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T GetValue() const { return fValue; }
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double GetTime() const { return fTime; }
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};
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typedef std::list< Item<T> > TimeList;
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typedef typename TimeList::iterator TimeListIterator; // .NET added typename to be C++ ISO compliant - JL
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TimeList fList;
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float fLen; // in time
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float fAvg;
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float fMaxAvg;
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double fTotal;
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TimeListIterator fRingStart, fRingEnd;
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hsMutex fLock;
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public:
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TimeBasedAvgRing():fLen(0.f),fAvg(0.f),fMaxAvg(0.f),fTotal(0.0) {}
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void SetRingLen(const float len) { fLen = len; }
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float GetRingLen() const { return fLen; }
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void AddItem(T value, double time);
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float GetAvg() const { return fAvg; }
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double GetTotal() const { return fTotal; }
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float GetMaxAvg() const { return fMaxAvg; }
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void ResetMaxAvg() { fMaxAvg=fAvg; }
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void Reset() { fRingStart=fRingEnd; ResetMaxAvg(); }
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};
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#endif // PL_AVG_H
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