GameTime.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Misc/AssertionMacros.h"
#include "Misc/CoreMiscDefines.h"
 
struct FGameTime
{
    inline FGameTime()
        : RealTimeSeconds(0.0)
        , WorldTimeSeconds(0.0)
        , DeltaRealTimeSeconds(0.0f)
        , DeltaWorldTimeSeconds(0.0f)
    { }
 
    FGameTime(const FGameTime&) = default;
    FGameTime& operator = (const FGameTime&) = default;
 
    // Returns the game time since GStartTime.
    static ENGINE_API FGameTime GetTimeSinceAppStart();
 
    static inline FGameTime CreateUndilated(double InRealTimeSeconds, float InDeltaRealTimeSeconds)
    {
        return FGameTime::CreateDilated(InRealTimeSeconds, InDeltaRealTimeSeconds, InRealTimeSeconds, InDeltaRealTimeSeconds);
    }
 
    static inline FGameTime CreateDilated(double InRealTimeSeconds, float InDeltaRealTimeSeconds, double InWorldTimeSeconds, float InDeltaWorldTimeSeconds)
    {
        return FGameTime(InRealTimeSeconds, InDeltaRealTimeSeconds, InWorldTimeSeconds, InDeltaWorldTimeSeconds);
    }
 
    inline double GetRealTimeSeconds() const
    {
        return RealTimeSeconds;
    }
 
    inline float GetDeltaRealTimeSeconds() const
    {
        return DeltaRealTimeSeconds;
    }
 
    inline double GetWorldTimeSeconds() const
    {
        return WorldTimeSeconds;
    }
 
    inline float GetDeltaWorldTimeSeconds() const
    {
        return DeltaWorldTimeSeconds;
    }
 
    inline float GetTimeDilation() const
    {
        ensure(DeltaRealTimeSeconds > 0.0f);
        return DeltaWorldTimeSeconds / DeltaRealTimeSeconds;
    }
 
    inline bool IsPaused() const
    {
        return DeltaWorldTimeSeconds == 0.0f;
    }
 
private:
    double RealTimeSeconds;
    double WorldTimeSeconds;
 
    float DeltaRealTimeSeconds;
    float DeltaWorldTimeSeconds;
 
    inline FGameTime(double InRealTimeSeconds, float InDeltaRealTimeSeconds, double InWorldTimeSeconds, float InDeltaWorldTimeSeconds)
        : RealTimeSeconds(InRealTimeSeconds)
        , WorldTimeSeconds(InWorldTimeSeconds)
        , DeltaRealTimeSeconds(InDeltaRealTimeSeconds)
        , DeltaWorldTimeSeconds(InDeltaWorldTimeSeconds)
    { }
 
};