fpsmeter.h

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/*
    Copyright (C) 2020 by Pawel Soja <kernel32.pl@gmail.com>
    FPS Meter
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.
 
    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>
#include <cstdint>
 
namespace INDI
{
class FPSMeter
{
    public:
        FPSMeter(double timeWindow = 1000);
 
    public:
        void reset();
 
        bool newFrame();
 
        void setTimeWindow(double timeWindow);
 
    public:
        double framesPerSecond() const;
        double deltaTime() const;
 
        uint64_t totalFrames() const;
 
        double totalTime() const;
 
    private:
        uint64_t mFramesPerElapsedTime = 0;
        double mElapsedTime = 0;
        double mTimeWindow = 1000;
 
        std::chrono::steady_clock::time_point mFrameTime1;
        std::chrono::steady_clock::time_point mFrameTime2;
 
        double mFramesPerSecond = 0;
 
        double mTotalTime = 0;
        uint64_t mTotalFrames = 0;
 
};
}