FrameRateLimiter.h
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FrameRateLimiter.h
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	#ifndef _ECHOFRAMERATELIMITER_H_
	#define _ECHOFRAMERATELIMITER_H_

	#include <echo/Chrono/Chrono.h>
	#include <boost/timer/timer.hpp>
	#include <boost/thread.hpp>

	namespace Echo
	{
	class FrameRateLimiter
	{
	public:
	FrameRateLimiter(Seconds minFrameTime, Seconds maxFrameTime) : mMinFrameTime(minFrameTime), mMaxFrameTime(maxFrameTime)
	{
	}

	void Start()
	{
	mFrameTimer.start();
	}

	inline Seconds GetLastFrameTime()
	{
	mLastFrameTime = Nanoseconds(mFrameTimer.elapsed().wall);
	if(mLastFrameTime>mMaxFrameTime)
	{
	mLastFrameTime = mMaxFrameTime;
	}
	mFrameTimer.start();
	return mLastFrameTime;
	}

	inline void Limit()
	{
	//The thread needs to stop processing for the minframetime-lastFrameTime.
	Seconds sleepTime = mMinFrameTime - mLastFrameTime;
	if(sleepTime>Seconds(0.))
	{
	boost::this_thread::sleep_for(sleepTime);
	}
	}

	void SetMMaxFrameTime(Seconds maxFrameTime)
	{
	mMaxFrameTime = maxFrameTime;
	}

	const Seconds& GetMaxFrameTime() const
	{
	return mMaxFrameTime;
	}

	void SetMinFrameTime(const Seconds& minFrameTime)
	{
	mMinFrameTime = minFrameTime;
	}

	const Seconds& GetMinFrameTime() const
	{
	return mMinFrameTime;
	}
	private:
	Seconds mMinFrameTime;
	Seconds mMaxFrameTime;
	Seconds mLastFrameTime;
	boost::timer::cpu_timer mFrameTimer;
	};
	}
	#endif