kc3-lang/angle/util/win32/Win32Timer.cpp

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• Author : Corentin Wallez
  Date : 2015-05-06 10:47:11
  Hash : ec0b1362
  Message : Make util/win32 follow ANGLE conventions better BUG=angleproject:892 Change-Id: I1ad366e16b135649fe1b0351081f9971db84df50 Reviewed-on: https://chromium-review.googlesource.com/269665 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Corentin Wallez <cwallez@chromium.org>

• util/win32/Win32Timer.cpp

• //
  // Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // Win32Timer.cpp: Implementation of a high precision timer class on Windows
  
  #include "win32/Win32Timer.h"
  
  Win32Timer::Win32Timer()
      : mRunning(false),
        mStartTime(0),
        mStopTime(0)
  {
  }
  
  void Win32Timer::start()
  {
      LARGE_INTEGER frequency;
      QueryPerformanceFrequency(&frequency);
      mFrequency = frequency.QuadPart;
  
      LARGE_INTEGER curTime;
      QueryPerformanceCounter(&curTime);
      mStartTime = curTime.QuadPart;
  
      mRunning = true;
  }
  
  void Win32Timer::stop()
  {
      LARGE_INTEGER curTime;
      QueryPerformanceCounter(&curTime);
      mStopTime = curTime.QuadPart;
  
      mRunning = false;
  }
  
  double Win32Timer::getElapsedTime() const
  {
      LONGLONG endTime;
      if (mRunning)
      {
          LARGE_INTEGER curTime;
          QueryPerformanceCounter(&curTime);
          endTime = curTime.QuadPart;
      }
      else
      {
          endTime = mStopTime;
      }
  
      return static_cast<double>(endTime - mStartTime) / mFrequency;
  }
  
  Timer *CreateTimer()
  {
      return new Win32Timer();
  }