www.pudn.com > tomohide_fur.03.13.02.zip > timer.cpp

//----------------------------------------------------------------------------- 
// File: timer.cpp 
// 
// Copyright (C) 2001-2002 Tomohide Kano. All rights reserved. 
//----------------------------------------------------------------------------- 
 
#include  
#include "timer.h" 
 
static DWORD start    = 0; 
static DWORD previous = 0; 
static DWORD current  = 0; 
static DWORD count    = 0; 
static DWORD interval = 1000; 
static float dt       = 0.0; 
static float fps      = 0.0; 
 
bool timerInit(float fps_interval) 
{ 
	timeBeginPeriod(1); 
	start = previous = timeGetTime(); 
	interval = int(fps_interval * 1000); 
	return true; 
} 
 
void timerDestroy() 
{ 
	timeEndPeriod(1); 
} 
 
void timerUpdate() 
{ 
	current = timeGetTime(); 
	dt = (current - previous) * 0.001f; 
	previous = current; 
	count++; 
 
	if (current - start > interval) 
	{ 
		fps = 1000 * count / float(current - start); 
		start = current; 
		count = 0; 
	} 
} 
 
float timerGetDT() 
{ 
	return dt; 
} 
 
float timerGetFPS() 
{ 
	return fps; 
}