timer.h

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/*!****************************************************************//*!*
 * \file   timer.h
 * \brief  Timer, calculating interframe deltatime and fps
 *         class definition module.
 * 
 * \author Sabitov Kirill
 * \date   28 June 2022
 *********************************************************************/
 
#pragma once
 
#include "base.h"
 
namespace scl
{
    using namespace std::chrono;
    class timer
    {
        using time_point = time_point<high_resolution_clock>;
 
    private: 
        bool           IsPause {};
        float          Time {};
        float          DeltaTime {};
        float          Fps { -1 };
 
        time_point     StartTime {};                    
        time_point     OldTime {};                      
        time_point     LastFpsCalcutionTime {};         
        u32            LastFpsCalcutionFramesCount {};  
        static shared<timer> GlobalTimerInstance;
 
    public: 
        static const float UpdateDelay; 
        static bool GetIsPause() { return GlobalTimerInstance->IsPause; }
        static float GetTime() { return GlobalTimerInstance->Time; }
        static float GetDeltaTime() { return GlobalTimerInstance->DeltaTime; }
        static float GetFps() { return GlobalTimerInstance->Fps; }
 
        static void SetIsPause(bool IsPause) { GlobalTimerInstance->IsPause = IsPause; }
        static void SwitchIsPause() { GlobalTimerInstance->IsPause = !GlobalTimerInstance->IsPause; }
 
    public:
        timer();
 
        /*!*
         * Timer response function.
         * Calculate inter-frame delta time each call,
         * but FPS only once second.
         * 
         * \param None.
         * \return None.
         */
        void Response();
 
        /*!*
         * Global timer getter function.
         * 
         * \param None.
         * \return None.
         */
        static shared<timer> &Get() { return GlobalTimerInstance; }
    };
}