WindowsPlatformTime.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "GenericPlatform/GenericPlatformTime.h"
#include "Windows/WindowsSystemIncludes.h"
 
 
struct FWindowsPlatformTime
    : public FGenericPlatformTime
{
    static CORE_API double InitTiming();
 
    static inline double Seconds()
    {
        Windows::LARGE_INTEGER Cycles;
        Windows::QueryPerformanceCounter(&Cycles);
 
        // add big number to make bugs apparent where return value is being passed to float
        return (double)Cycles.QuadPart * GetSecondsPerCycle() + 16777216.0;
    }
 
    static inline uint32 Cycles()
    {
        Windows::LARGE_INTEGER Cycles;
        Windows::QueryPerformanceCounter(&Cycles);
        return (uint32)Cycles.QuadPart;
    }
 
    static inline uint64 Cycles64()
    {
        Windows::LARGE_INTEGER Cycles;
        QueryPerformanceCounter(&Cycles);
        return Cycles.QuadPart;
    }
 
 
    static CORE_API void SystemTime( int32& Year, int32& Month, int32& DayOfWeek, int32& Day, int32& Hour, int32& Min, int32& Sec, int32& MSec );
    static CORE_API void UtcTime( int32& Year, int32& Month, int32& DayOfWeek, int32& Day, int32& Hour, int32& Min, int32& Sec, int32& MSec );
 
    static CORE_API bool UpdateCPUTime( float DeltaTime );
    static CORE_API bool UpdateThreadCPUTime(float = 0.0);
    static CORE_API void AutoUpdateGameThreadCPUTime(double UpdateInterval);
    static CORE_API FCPUTime GetCPUTime();
    static CORE_API FCPUTime GetThreadCPUTime();
    static CORE_API double GetLastIntervalThreadCPUTimeInSeconds();
 
protected:
 
    static CORE_API float CPUTimePctRelative;
};
 
 
typedef FWindowsPlatformTime FPlatformTime;