framework2

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#include "ofFpsCounter.h"
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ofFpsCounter::ofFpsCounter()
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:nFrameCount(0)
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,then(ofGetCurrentTime())
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,fps(0)
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,lastFrameTime(0)
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,filteredTime(0)
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,filterAlpha(0.9){}
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ofFpsCounter::ofFpsCounter(double targetFPS)
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:nFrameCount(0)
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,then(ofGetCurrentTime())
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,fps(targetFPS)
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,lastFrameTime(0)
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,filteredTime(0)
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,filterAlpha(0.9){}
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void ofFpsCounter::newFrame(){
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	auto now = ofGetCurrentTime();
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	update(now.getAsSeconds());
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	timestamps.push(now.getAsSeconds());
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	lastFrameTime = now - then;
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	uint64_t filtered = filteredTime.count() * filterAlpha + lastFrameTime.count() * (1-filterAlpha);
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	filteredTime = std::chrono::nanoseconds(filtered);
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	then = now;
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	nFrameCount++;
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}
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void ofFpsCounter::update(){
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	auto now = ofGetCurrentTime();
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	update(now.getAsSeconds());
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}
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void ofFpsCounter::update(double now){
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	while(!timestamps.empty() && timestamps.front() + 2 < now){
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		timestamps.pop();
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	}
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	auto diff = 0.0;
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	if(!timestamps.empty() && timestamps.front() + 0.5 < now){
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		diff = now - timestamps.front();
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	}
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	if(diff>0.0){
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		fps = timestamps.size() / diff;
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	}else{
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		fps = timestamps.size();
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	}
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}
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double ofFpsCounter::getFps() const{
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	return fps;
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}
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uint64_t ofFpsCounter::getNumFrames() const{
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	return nFrameCount;
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}
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uint64_t ofFpsCounter::getLastFrameNanos() const{
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	return lastFrameTime.count();
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}
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double ofFpsCounter::getLastFrameSecs() const{
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	return std::chrono::duration<double>(lastFrameTime).count();
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}
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uint64_t ofFpsCounter::getLastFrameFilteredNanos() const{
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	return lastFrameTime.count();
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}
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double ofFpsCounter::getLastFrameFilteredSecs() const{
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	return std::chrono::duration<double>(filteredTime).count();
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}
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void ofFpsCounter::setFilterAlpha(float alpha){
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	filterAlpha = alpha;
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}
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