FPSTracker.h

#pragma once
#include <SFML/System.hpp>
#include <array>

class FPSTracker
{
public:
    FPSTracker();

    void Update(const sf::Time& delta_time);
    void UpdateStats(const sf::Time& delta_time);

    const float& GetAverageFps() const { return current_average_fps_; }
    const float& GetFrameTimeMs() const { return current_frame_time_ms_; }
    const float& GetHighsFps() const { return current_highs_fps_; }
    const float& GetLowsFps() const { return current_lows_fps_; }
private:
    static constexpr size_t FPS_HISTORY_SIZE_ = 64; // Must be a power of 2 for performance. Constexpr to make it a compile time constant, making it faster
    float fps_history_[FPS_HISTORY_SIZE_];
    float current_average_fps_ = 0.f;
    float current_highs_fps_ = 0.f;
    float current_lows_fps_ = 0.f;
    float current_frame_time_ms_ = 0.f;
 
    size_t current_index_ = 0; // Used for going through the FPS hisroty in a circular manner

    std::array<float, FPS_HISTORY_SIZE_> GetSortedHistory();
};