Timer.h

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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.
 */
 
#pragma once
 
#include <chrono>
 
namespace core
{
using clock = std::chrono::high_resolution_clock;
 
class Timer
{
public:
    Timer();
 
    void start();
 
    void stop();
 
    double elapsed() const;
 
    int64_t microseconds() const;
 
    int64_t milliseconds() const;
 
    double seconds() const;
 
    double perSecond() const;
 
    double fps() const;
 
    double perSecondSmoothed() const;
 
private:
    clock::time_point _startTime;
    int64_t _microseconds{0};
    double _smoothNom{0.0};
    double _smoothDen{0.0};
    const double _smoothingFactor{0.9}; // closer to 1 means more smoothing
    clock::time_point _lastFPSTickTime;
    double _fps{0.0};
};
} // namespace core