//FPSキープ
//ただし、スキップは対応せず

class FpsKeeper{
public:
	void Init(ref ss_timer_t timer,int fps);
	bool LastFpsChange();
	int GetLastFps();
	void Frame();
	int GetWaitTime();
	
	bool GetKeep(){return m_bKeep;}
	void SetKeep(bool keep){m_bKeep=keep;}
private:
	ref	ss_timer_t m_fpsMaster;
	ss_timer_t m_realTimer;
	ss_timming m_realOneSec;
	ss_timming m_FpsTimer;
	int m_nKeepingFps;
	int m_nLastFps;
	int m_nLastFrame;
	int m_nCountingFps;
	int m_nBitweenTime;
	bool m_bKeep;
};


void FpsKeeper::Init(ref ss_timer_t timer,int fps){
	m_fpsMaster<-timer;
	//1000ミリ秒で発火する。
	m_realTimer.Start();
	m_realOneSec.InitTimming(m_realTimer);
	m_realOneSec.StartInterval(1000);
	
	//17ミリ秒で発火する
	int fpsbetween=1000/fps;
	//if(1000 % fps!=0) fpsbetween++;
	m_nBitweenTime=fpsbetween;
	m_FpsTimer.InitTimming(m_realTimer);
	m_FpsTimer.StartInterval(m_nBitweenTime);
	
	m_bKeep=true;
}
bool FpsKeeper::LastFpsChange(){
	if(m_realOneSec.Check()){
		m_nLastFps=m_nCountingFps;
		m_nCountingFps=0;
		m_realOneSec.Start();
		return true;
	}
	return false;
}
int FpsKeeper::GetLastFps(){
	return m_nLastFps;
}
void FpsKeeper::Frame(){
	m_nCountingFps++;
	m_FpsTimer.Start();
}
int FpsKeeper::GetWaitTime(){
	if(!m_bKeep) return 0;//キープしない場合はウェイトは零秒とする。
	int keika=m_FpsTimer.GetTime();
	keika=m_nBitweenTime-keika;
	if(keika < 0) return 0;
	return keika;
}