kc3-lang/angle/util/windows/WindowsTimer.cpp

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• Author : Austin Kinross
  Date : 2015-09-02 12:29:07
  Hash : 9f2fd2b4
  Message : Add WinrtWindow.cpp and WinRT version of angle_util Change-Id: If4ff4b966f5bd388d32c72a2d1bcf9cf29e6032d Reviewed-on: https://chromium-review.googlesource.com/297308 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Austin Kinross <aukinros@microsoft.com>

• util/windows/WindowsTimer.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.
  //
  
  // WindowsTimer.cpp: Implementation of a high precision timer class on Windows
  
  #include "windows/WindowsTimer.h"
  
  WindowsTimer::WindowsTimer() : mRunning(false), mStartTime(0), mStopTime(0)
  {
  }
  
  void WindowsTimer::start()
  {
      LARGE_INTEGER frequency;
      QueryPerformanceFrequency(&frequency);
      mFrequency = frequency.QuadPart;
  
      LARGE_INTEGER curTime;
      QueryPerformanceCounter(&curTime);
      mStartTime = curTime.QuadPart;
  
      mRunning = true;
  }
  
  void WindowsTimer::stop()
  {
      LARGE_INTEGER curTime;
      QueryPerformanceCounter(&curTime);
      mStopTime = curTime.QuadPart;
  
      mRunning = false;
  }
  
  double WindowsTimer::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 WindowsTimer();
  }