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# KeosWin32Timer.cpp

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    00001 /*
    00002  * This source file is part of KEOS (Free 3D Engine)
    00003  * For the latest info, see http://www.keosengine.org/
    00004  * E-mails : thierry.vouriot@keosengine.org, yeri@keosengine.org
    00005  *
    00006  * This program is free software; you can redistribute it and/or modify it under
    00007  * the terms of the GNU Lesser General Public License as published by the Free Software
    00008  * Foundation; either version 2 of the License, or (at your option) any later
    00009  * version.
    00010  *
    00011  * This program is distributed in the hope that it will be useful, but WITHOUT
    00012  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    00013  * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
    00014  *
    00015  * You should have received a copy of the GNU Lesser General Public License along with
    00016  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
    00017  * Place - Suite 330, Boston, MA 02111-1307, USA, or go to
    00018  * http://www.gnu.org/copyleft/lesser.txt.
    00019  *
    00020  */
    00021
    00022 #include "KeosWin32Timer.h"
    00023
    00024 namespace Keos
    00025 {
    00026     //=======================================================================
    00027     // CWin32Timer implementation
    00028     //=======================================================================
    00029
    00030     //-----------------------------------------------------------------------
    00031     CWin32Timer::CWin32Timer()
    00032     {
    00033
    00034     }
    00035
    00036     //-----------------------------------------------------------------------
    00037     void CWin32Timer::Reset()
    00038     {
    00039         QueryPerformanceFrequency(&m_nFrequency);
    00040         QueryPerformanceCounter(&m_nStartTime);
    00041     }
    00042
    00043     //-----------------------------------------------------------------------
    00044     unsigned long CWin32Timer::GetMilliseconds()
    00045     {
    00046         LARGE_INTEGER curTime;
    00047         LONGLONG newTicks;
    00048
    00049         QueryPerformanceCounter(&curTime);
    00050
    00051         newTicks = (curTime.QuadPart - m_nStartTime.QuadPart);
    00052         // Scale by 1000 in order to get millisecond precision
    00053         newTicks *= 1000;
    00054         newTicks /= m_nFrequency.QuadPart;
    00055
    00056         return (unsigned long)newTicks;
    00057           }
    00058
    00059     //-----------------------------------------------------------------------
    00060         unsigned long CWin32Timer::GetMicroseconds()
    00061         {
    00062                 LARGE_INTEGER curTime;
    00063                 LONGLONG newTicks;
    00064
    00065                 QueryPerformanceCounter(&curTime);
    00066
    00067                 newTicks = (curTime.QuadPart - m_nStartTime.QuadPart);
    00068                 // Scale by 1000000 in order to get microsecond precision
    00069                 newTicks *= (Real)1000000.0/(Real)m_nFrequency.QuadPart;
    00070
    00071                 return (unsigned long)newTicks;
    00072         }
    00073
    00074 } // namespace Keos