forked from bartvdbraak/blender
94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
/**
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* $Id$
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*
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* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version. The Blender
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* Foundation also sells licenses for use in proprietary software under
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* the Blender License. See http://www.blender.org/BL/ for information
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* about this.
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*
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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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*
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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, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL/BL DUAL LICENSE BLOCK *****
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* Timing routine taken and modified from KX_BlenderSystem.cpp
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*/
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#include <windows.h>
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#include "GPW_System.h"
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GPW_System::GPW_System(void)
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{
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m_freq = 0;
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m_lastCount = 0;
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m_lastRest = 0;
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m_lastTime = 0;
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}
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double GPW_System::GetTimeInSeconds()
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{
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#if 0
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double secs = ::GetTickCount();
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secs /= 1000.;
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return secs;
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#else
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// 03/20/1999 Thomas Hieber: completely redone to get true Millisecond
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// accuracy instead of very rough ticks. This routine will also provide
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// correct wrap around at the end of "long"
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// m_freq was set to -1, if the current Hardware does not support
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// high resolution timers. We will use GetTickCount instead then.
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if (m_freq < 0) {
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return ::GetTickCount();
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}
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// m_freq is 0, the first time this function is being called.
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if (m_freq == 0) {
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// Try to determine the frequency of the high resulution timer
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if (!::QueryPerformanceFrequency((LARGE_INTEGER*)&m_freq)) {
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// There is no such timer....
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m_freq = -1;
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return 0;
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}
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}
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// Retrieve current count
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__int64 count = 0;
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::QueryPerformanceCounter((LARGE_INTEGER*)&count);
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// Calculate the time passed since last call, and add the rest of
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// those tics that didn't make it into the last reported time.
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__int64 delta = 1000*(count-m_lastCount) + m_lastRest;
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m_lastTime += (long)(delta/m_freq); // Save the new value
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m_lastRest = delta%m_freq; // Save those ticks not being counted
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m_lastCount = count; // Save last count
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// Return a high quality measurement of time
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return m_lastTime/1000.0;
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#endif
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}
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