KeosWin32Timer.cpp

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/*
 * This source file is part of KEOS (Free 3D Engine)
 * For the latest info, see http://www.keosengine.org/
 * E-mails : thierry.vouriot@keosengine.org, yeri@keosengine.org
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307, USA, or go to
 * http://www.gnu.org/copyleft/lesser.txt.
 *
 */

#include "KeosWin32Timer.h"

namespace Keos
{
  //=======================================================================
  // CWin32Timer implementation
  //=======================================================================

  //-----------------------------------------------------------------------
  CWin32Timer::CWin32Timer()
  {}

  //-----------------------------------------------------------------------
  CWin32Timer::~CWin32Timer()
  {}

  //-----------------------------------------------------------------------
  void CWin32Timer::Reset()
  {
    QueryPerformanceFrequency(&m_nFrequency);
    QueryPerformanceCounter(&m_nStartTime);
  }

  //-----------------------------------------------------------------------
  unsigned long CWin32Timer::GetMilliseconds()
  {
    LARGE_INTEGER curTime;
    LONGLONG newTicks;

    QueryPerformanceCounter(&curTime);

    newTicks = (curTime.QuadPart - m_nStartTime.QuadPart);
    // Scale by 1000 in order to get millisecond precision
    newTicks *= 1000;
    newTicks /= m_nFrequency.QuadPart;

    return (unsigned long)newTicks;
  }

  //-----------------------------------------------------------------------
  unsigned long CWin32Timer::GetMicroseconds()
  {
    LARGE_INTEGER curTime;
    LONGLONG newTicks;

    QueryPerformanceCounter(&curTime);

    newTicks = (curTime.QuadPart - m_nStartTime.QuadPart);
    // Scale by 1000000 in order to get microsecond precision
    newTicks *= (Real)1000000.0 / (Real)m_nFrequency.QuadPart;

    return (unsigned long)newTicks;
  }

} // namespace Keos

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