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

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• Author : Jamie Madill
  Date : 2018-10-26 11:25:32
  Hash : 3ce69ba3
  Message : Fix Win32Timer's Frequency init. This could cause some problems on the perf bots. Bug: angleproject:2908 Change-Id: If12e5939ba80b3fd0b9609e7b76df6045e60cb94 Reviewed-on: https://chromium-review.googlesource.com/c/1301849 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>

• 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), mFrequency(0)
  {
  }
  
  LONGLONG WindowsTimer::getFrequency()
  {
      if (mFrequency == 0)
      {
          LARGE_INTEGER frequency = {};
          QueryPerformanceFrequency(&frequency);
  
          mFrequency = frequency.QuadPart;
      }
  
      return mFrequency;
  }
  
  void WindowsTimer::start()
  {
      LARGE_INTEGER curTime;
      QueryPerformanceCounter(&curTime);
      mStartTime = curTime.QuadPart;
  
      // Cache the frequency
      getFrequency();
  
      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;
  }
  
  double WindowsTimer::getAbsoluteTime()
  {
      LARGE_INTEGER curTime;
      QueryPerformanceCounter(&curTime);
  
      return static_cast<double>(curTime.QuadPart) / getFrequency();
  }
  
  Timer *CreateTimer()
  {
      return new WindowsTimer();
  }