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OgreWin32Timer.cpp

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00001 /*
00002 -----------------------------------------------------------------------------
00003 This source file is part of OGRE
00004     (Object-oriented Graphics Rendering Engine)
00005 For the latest info, see http://www.ogre3d.org/
00006 
00007 Copyright © 2000-2002 The OGRE Team
00008 Also see acknowledgements in Readme.html
00009 
00010 This program is free software; you can redistribute it and/or modify it under
00011 the terms of the GNU Lesser General Public License as published by the Free Software
00012 Foundation; either version 2 of the License, or (at your option) any later
00013 version.
00014 
00015 This program is distributed in the hope that it will be useful, but WITHOUT
00016 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00017 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
00018 
00019 You should have received a copy of the GNU Lesser General Public License along with
00020 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
00021 Place - Suite 330, Boston, MA 02111-1307, USA, or go to
00022 http://www.gnu.org/copyleft/lesser.txt.
00023 -----------------------------------------------------------------------------
00024 */
00025 #include "OgreWin32Timer.h"
00026 
00027 namespace Ogre {
00028     //-------------------------------------------------------------------------
00029     void Win32Timer::reset()
00030     {
00031         Timer::reset();
00032         QueryPerformanceFrequency(&mFrequency);
00033         QueryPerformanceCounter(&mStartTime);
00034     }
00035     //-------------------------------------------------------------------------
00036     unsigned long Win32Timer::getMilliseconds()
00037     {
00038         LARGE_INTEGER curTime;
00039         LONGLONG newTicks;
00040 
00041         QueryPerformanceCounter(&curTime);
00042 
00043         newTicks = (curTime.QuadPart - mStartTime.QuadPart);
00044         // Scale by 1000 in order to get millisecond precision
00045         newTicks *= 1000;
00046         newTicks /= mFrequency.QuadPart;
00047 
00048         return (unsigned long)newTicks;
00049     }
00050     //-------------------------------------------------------------------------
00051     unsigned long Win32Timer::getMicroseconds()
00052     {
00053         LARGE_INTEGER curTime;
00054         LONGLONG newTicks;
00055 
00056         QueryPerformanceCounter(&curTime);
00057 
00058         newTicks = (curTime.QuadPart - mStartTime.QuadPart);
00059         // Scale by 1000000 in order to get microsecond precision
00060         newTicks *= (Real)1000000.0/(Real)mFrequency.QuadPart;
00061 
00062         return (unsigned long)newTicks;
00063     }
00064 
00065 } 

Copyright © 2002-2003 by The OGRE Team
Last modified Fri May 14 23:22:55 2004