Timer.cpp

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/*
 * Copyright (c) 2017-2024, EPFL/Blue Brain Project
 *
 * This file is part of Blue Brain BioExplorer <https://github.com/BlueBrain/BioExplorer>
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 3.0 as published
 * by the Free Software Foundation.
 *
 * This library 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 library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#include "Timer.h"
 
#include <chrono>
constexpr double MICRO_PER_SEC = 1000000.0;
constexpr double FPS_UPDATE_MILLISECS = 150;
 
namespace core
{
Timer::Timer()
{
    _lastFPSTickTime = clock::now();
    _startTime = clock::now();
}
 
void Timer::start()
{
    _startTime = clock::now();
}
 
double Timer::elapsed() const
{
    return std::chrono::duration<double>{clock::now() - _startTime}.count();
}
 
void Timer::stop()
{
    const auto now = clock::now();
    _microseconds = std::chrono::duration_cast<std::chrono::microseconds>(now - _startTime).count();
    _smoothNom = _smoothNom * _smoothingFactor + _microseconds / MICRO_PER_SEC;
    _smoothDen = _smoothDen * _smoothingFactor + 1.f;
 
    const auto secsLastFPSTick = std::chrono::duration_cast<std::chrono::milliseconds>(now - _lastFPSTickTime).count();
 
    if (secsLastFPSTick >= FPS_UPDATE_MILLISECS)
    {
        _lastFPSTickTime = now;
        _fps = perSecond();
    }
}
 
int64_t Timer::microseconds() const
{
    return _microseconds;
}
 
int64_t Timer::milliseconds() const
{
    return _microseconds / 1000.0;
}
 
double Timer::seconds() const
{
    return _microseconds / MICRO_PER_SEC;
}
 
double Timer::perSecond() const
{
    return MICRO_PER_SEC / _microseconds;
}
 
double Timer::perSecondSmoothed() const
{
    return _smoothDen / _smoothNom;
}
 
double Timer::fps() const
{
    return _fps;
}
} // namespace core