Jason Felds
90 lines
2.9 KiB
C++
90 lines
2.9 KiB
C++
#include "global.h"
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#include "SampleHistory.h"
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#include "RageLog.h"
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#include "RageUtil.h"
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#include "Foreach.h"
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SampleHistory::SampleHistory()
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{
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m_iLastHistory = 0;
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m_iHistorySamplesPerSecond = 60;
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m_fHistorySeconds = 0.0f;
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m_fToSample = 1 / m_iHistorySamplesPerSecond;
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m_fHistorySeconds = 10.0f;
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int iSamples = lrintf( m_iHistorySamplesPerSecond * m_fHistorySeconds );
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m_afHistory.resize( iSamples );
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}
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float SampleHistory::GetSampleNum( float fSamplesAgo ) const
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{
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fSamplesAgo = min( fSamplesAgo, (float) m_afHistory.size() - 1 );
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if( fSamplesAgo < 0 )
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fSamplesAgo = 0;
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if( m_afHistory.size() == 0 )
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return 0.0f;
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float fSample = m_iLastHistory - fSamplesAgo - 1;
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float f = floorf( fSample );
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int iSample = lrintf(f);
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int iNextSample = iSample + 1;
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wrap( iSample, m_afHistory.size() );
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wrap( iNextSample, m_afHistory.size() );
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float p = fSample - f;
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float fRet = lerp( p, m_afHistory[iSample], m_afHistory[iNextSample] );
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// LOG->Trace( "%.3f: %i, %i, %.3f (f %.3f, %.3f)", fSample, iSample, iNextSample, fRet, f, p );
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return fRet;
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}
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float SampleHistory::GetSample( float fSecondsAgo ) const
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{
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float fSamplesAgo = fSecondsAgo * m_iHistorySamplesPerSecond;
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return GetSampleNum( fSamplesAgo );
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}
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void SampleHistory::AddSample( float fSample, float fDeltaTime )
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{
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while( fDeltaTime > 0.0001f )
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{
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float fTime = min( m_fToSample, fDeltaTime );
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m_fToSample -= fTime;
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fDeltaTime -= fTime;
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if( m_fToSample < 0.0001f )
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{
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++m_iLastHistory;
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m_iLastHistory %= m_afHistory.size();
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m_fToSample += 1.0f / m_iHistorySamplesPerSecond;
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}
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m_afHistory[m_iLastHistory] = fSample;
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}
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}
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/*
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* (c) 2006-2007 Glenn Maynard
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, and/or sell copies of the Software, and to permit persons to
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* whom the Software is furnished to do so, provided that the above
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* copyright notice(s) and this permission notice appear in all copies of
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* the Software and that both the above copyright notice(s) and this
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* permission notice appear in supporting documentation.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
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* THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
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* INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
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* OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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