time.h

VC++ DEMO, used for the beginners and the amour

#ifdef CGE_HEADER_H
#ifndef CGE_TIME_H
#define CGE_TIME_H
namespace CGE
{
	namespace TIME
	{
		typedef class CLOCK
		{
		public: 
			CLOCK();
			~CLOCK();
		public:
			DWORD End();
			VOID  Begin();
			VOID  Delay(DWORD dwDelay);
			DWORD mm_timer_start;	
			__int64        performance_timer_start;	// Performance Timer Start Value
			static BOOL	   performance_timer;
			static __int64 performance_timer_frequency; 
		}*LPCLOCK;

		CGE_INLINE 
			VOID CLOCK::Delay( DWORD dwDelay )
		{
			// dwDelay为毫秒级数.
			if ( performance_timer_frequency != -1)
			{
				while ( (End()) <  dwDelay );
				Begin();
			}
		}
		
		typedef class FPS
		{
		public:
			FPS();
			VOID Limit(LONG fps);
			FLOAT Refresh();
			FLOAT GetFPS() { return m_fFPS; }
		protected:
			FLOAT m_fFPS;						// 帧数/秒
			DWORD m_dwFrameCount;				// 总帧数
			CLOCK m_dyTimer;					// 计算FPS
			CLOCK m_dyLimit;					// 控制FPS  
		}*LPFPS;
		// 控制FPS为指定值
		CGE_INLINE
			VOID FPS::Limit( LONG fps )
		{
			m_dyLimit.Delay( 1000000 / fps );
		}
		// 刷新当前FPS值
		CGE_INLINE 
			FLOAT FPS::Refresh()
		{
			m_dwFrameCount++;
			DWORD t = m_dyTimer.End();
			if ( t >= 1000000 )
			{
				m_fFPS = (FLOAT)(m_dwFrameCount * 1000000) / (FLOAT)t;
				m_dwFrameCount = 0;
				m_dyTimer.Begin();
			}
			return m_fFPS;
		}
	}
}
#endif
#endif