time.hpp

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#pragma once

#include <cmath>
#include <optional>

#include "Mountain/core.hpp"
#include "Mountain/utils/stopwatch.hpp"


namespace Mountain
{
    class Time
    {
        STATIC_CLASS(Time)

    public:
        MOUNTAIN_API static inline float_t timeScale = 1.f;

        MOUNTAIN_API static inline float_t maxDeltaTime = 0.1f;

        MOUNTAIN_API static inline float_t freezeTimer = 0.f;

        MOUNTAIN_API static inline std::optional<double_t> targetFps;

        STATIC_GETTER(float_t, TotalTime, m_TotalTime)

        
        STATIC_GETTER(float_t, LastTotalTime, m_LastTotalTime)

        
        STATIC_GETTER(float_t, TotalTimeUnscaled, m_TotalTimeUnscaled)

        
        STATIC_GETTER(float_t, LastTotalTimeUnscaled, m_LastTotalTimeUnscaled)

        
        STATIC_GETTER(float_t, DeltaTime, m_DeltaTime)

        
        STATIC_GETTER(float_t, DeltaTimeUnscaled, m_DeltaTimeUnscaled)

        
        STATIC_GETTER(uint64_t, TotalFrameCount, m_TotalFrameCount)

        
        MOUNTAIN_API static float_t GetTargetDeltaTime();

        STATIC_GETTER(float_t, LastFrameDuration, m_LastFrameDuration)

        
        [[nodiscard]]
        MOUNTAIN_API static bool_t OnInterval(float_t interval);

        [[nodiscard]]
        MOUNTAIN_API static bool_t OnIntervalUnscaled(float_t interval);

    private:
        MOUNTAIN_API static inline float_t m_TotalTime = 0.f;
        MOUNTAIN_API static inline float_t m_LastTotalTime = 0.f;
        MOUNTAIN_API static inline float_t m_TotalTimeUnscaled = 0.f;
        MOUNTAIN_API static inline float_t m_LastTotalTimeUnscaled = 0.f;
        MOUNTAIN_API static inline float_t m_DeltaTime = 0.f;
        MOUNTAIN_API static inline float_t m_DeltaTimeUnscaled = 0.f;
        MOUNTAIN_API static inline uint64_t m_TotalFrameCount = 0;

        MOUNTAIN_API static inline float_t m_LastFrameDuration = 0.f;

        MOUNTAIN_API static inline Stopwatch m_Stopwatch;

        static void Initialize();
        static void Shutdown();

        static void Update();
        static void WaitForNextFrame();
        static double_t SleepFor(double_t milliseconds);

        // Calls Initialize, Shutdown, Update and WaitForNextFrame
        friend class Game;
    };
}