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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 Sun Nov 28 19:48:51 2004