framework2

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#include "ofTimer.h"
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#define NANOS_PER_SEC 1000000000ll
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void ofGetMonotonicTime(uint64_t & seconds, uint64_t & nanoseconds);
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ofTimer::ofTimer()
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:nanosPerPeriod(0)
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#ifdef TARGET_WIN32
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,hTimer(CreateWaitableTimer(nullptr, TRUE, nullptr))
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#endif
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{
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}
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void ofTimer::reset(){
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#if defined(TARGET_WIN32)
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	GetSystemTimeAsFileTime((LPFILETIME)&nextWakeTime);
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#else
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	nextWakeTime = ofGetCurrentTime();
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#endif
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	calculateNextPeriod();
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}
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void ofTimer::setPeriodicEvent(uint64_t nanoseconds){
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	nanosPerPeriod = std::chrono::nanoseconds(nanoseconds);
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	reset();
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}
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void ofTimer::waitNext(){
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#if (defined(TARGET_LINUX) && !defined(TARGET_RASPBERRY_PI_LEGACY))
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	timespec remainder = {0,0};
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	timespec wakeTime = nextWakeTime.getAsTimespec();
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	clock_nanosleep(CLOCK_MONOTONIC,TIMER_ABSTIME,&wakeTime,&remainder);
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#elif defined(TARGET_WIN32)
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	WaitForSingleObject(hTimer, INFINITE);
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#else
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	auto now = ofGetCurrentTime();
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	if(now < nextWakeTime){
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		auto waitNanos = nextWakeTime - now;
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		timespec waittime = (ofTime() + waitNanos).getAsTimespec();
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		timespec remainder = {0,0};
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		nanosleep(&waittime, &remainder);
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	}
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#endif
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	calculateNextPeriod();
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}
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void ofTimer::calculateNextPeriod(){
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#if defined(TARGET_WIN32)
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	nextWakeTime.QuadPart += nanosPerPeriod.count()/100;
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    LARGE_INTEGER now;
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    GetSystemTimeAsFileTime((LPFILETIME)&now);
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	if(nextWakeTime.QuadPart<now.QuadPart){
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	    reset();
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	}else{
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	    SetWaitableTimer(hTimer, &nextWakeTime, 0, nullptr, nullptr, 0);
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	}
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#else
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	nextWakeTime += nanosPerPeriod;
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	auto now = ofGetCurrentTime();
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    if(nextWakeTime<now){
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        reset();
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    }
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#endif
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}
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