text: /*
   * Copyright (c) 2011-2016, Georgia Tech Research Corporation
   * All rights reserved.
   *
   * Author(s): Sehoon Ha <sehoon.ha@gmail.com>
   *
   * Georgia Tech Graphics Lab and Humanoid Robotics Lab
   *
   * Directed by Prof. C. Karen Liu and Prof. Mike Stilman
   * <karenliu@cc.gatech.edu> <mstilman@cc.gatech.edu>
   *
   * This file is provided under the following "BSD-style" License:
   *   Redistribution and use in source and binary forms, with or
   *   without modification, are permitted provided that the following
   *   conditions are met:
   *   * Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer.
   *   * Redistributions in binary form must reproduce the above
   *     copyright notice, this list of conditions and the following
   *     disclaimer in the documentation and/or other materials provided
   *     with the distribution.
   *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
   *   CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
   *   INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   *   MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   *   DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
   *   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   *   USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   *   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   *   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   *   ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   *   POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "dart/common/Timer.hpp"
  
  #include <ctime>
  #include <iostream>
  #include <string>
  
  // #if defined _WIN64 || defined _WIN32
  // #define CLOCKS_PER_SEC 1000
  // #endif
  
  namespace dart {
  namespace common {
  
  //==============================================================================
  Timer::Timer(const std::string& _name)
    : mCount(0),
      mLastElapsedTime(0.0),
      mTotalElapsedTime(0.0),
      mName(_name),
      mIsStarted(false)
  {
  #ifdef _WIN32
    mTimer.start.QuadPart = 0;
    mTimer.stop.QuadPart = 0;
    QueryPerformanceFrequency(&mFrequency);
  #else
    mStartedTime = 0.0;
    mStoppedTime = 0.0;
  #endif
  }
  
  //==============================================================================
  Timer::~Timer()
  {
  }
  
  //==============================================================================
  #ifdef _WIN32
  double Timer::_convLIToSecs(const LARGE_INTEGER& _L)
  {
    return (static_cast<double>(_L.QuadPart)
            / static_cast<double>(mFrequency.QuadPart));
  }
  #endif
  
  //==============================================================================
  void Timer::start()
  {
    mIsStarted = true;
    mCount++;
  #ifdef _WIN32
    QueryPerformanceCounter(&mTimer.start);
  #else
    gettimeofday(&mTimeVal, nullptr);
    mStartedTime = mTimeVal.tv_sec + (mTimeVal.tv_usec / 1.0e+6);
  #endif
  }
  
  //==============================================================================
  void Timer::stop()
  {
    mIsStarted = false;
  #ifdef _WIN32
    QueryPerformanceCounter(&mTimer.stop);
    LARGE_INTEGER time;
    time.QuadPart = mTimer.stop.QuadPart - mTimer.start.QuadPart;
    mLastElapsedTime = _convLIToSecs(time);
  #else
    gettimeofday(&mTimeVal, nullptr);
    mStoppedTime = mTimeVal.tv_sec + (mTimeVal.tv_usec / 1.0e+6);
    mLastElapsedTime = mStoppedTime - mStartedTime;
  #endif
    mTotalElapsedTime += mLastElapsedTime;
  }
  
  //==============================================================================
  double Timer::getElapsedTime()
  {
  #ifdef _WIN32
    LARGE_INTEGER timenow;
    QueryPerformanceCounter(&timenow);
    LARGE_INTEGER time;
    time.QuadPart = timenow.QuadPart - mTimer.start.QuadPart;
    mLastElapsedTime = _convLIToSecs(time);
  #else
    gettimeofday(&mTimeVal, nullptr);
    mLastElapsedTime = mTimeVal.tv_sec + (mTimeVal.tv_usec / 1.0e+6)
                       - mStartedTime;
  #endif
    return mLastElapsedTime;
  }
  
  //==============================================================================
  double Timer::getLastElapsedTime() const
  {
    return mLastElapsedTime;
  }
  
  //==============================================================================
  double Timer::getTotalElapsedTime() const
  {
    return mTotalElapsedTime;
  }
  
  //==============================================================================
  bool Timer::isStarted() const
  {
    return mIsStarted;
  }
  
  //==============================================================================
  void Timer::print()
  {
    if (mCount > 0)
    {
      std::cout << "Timer [" << mName << "] : " << std::endl
                << "Last elapsed : " << mLastElapsedTime << "; "
                << "Total time : " << " "
                << mTotalElapsedTime << "; "
                << "Total count : " << mCount << "; "
                << "Average time : " << mTotalElapsedTime / mCount << " "
                << "FPS : " << mCount / mTotalElapsedTime << " hz " << std::endl;
    }
    else
    {
      std::cout << "Timer [" << mName << "] doesn't have any record." << std::endl;
    }
  }
  
  //==============================================================================
  double Timer::getWallTime()
  {
  #ifdef _WIN32
    LARGE_INTEGER ticksPerSecond;
    LARGE_INTEGER ticks;
    QueryPerformanceFrequency(&ticksPerSecond);
    QueryPerformanceCounter(&ticks);
    return static_cast<double>(ticks.QuadPart)
        / static_cast<double>(ticksPerSecond.QuadPart);
  #else
    // Initialize the lastUpdateTime with the current time in seconds
    timeval timeVal;
    gettimeofday(&timeVal, nullptr);
    return timeVal.tv_sec + timeVal.tv_usec / 1.0e+6;
  #endif
  }
  
  }  // namespace common
  }  // namespace dart
  