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/*
* Modification History
*
* 2001-October-29 Jason Rohrer
* Created.
*
* 2004-October-14 Jason Rohrer
* Fixed sign bug.
*
* 2005-February-10 Jason Rohrer
* Added function to get time in floating point format.
*/
#include "minorGems/common.h"
#ifndef TIME_INCLUDED
#define TIME_INCLUDED
/**
* Interface for platform-independent, high-resolution time access.
*
* @author Jason Rohrer
*/
class Time {
public:
/**
* Gets the current time in seconds and milliseconds.
*
* No guarentee about when absolute 0 of this time
* scale is for particular systems.
*
* @param outSeconds pointer to where the time in seconds
* will be returned.
* @param outMilliseconds pointer to where the extra
* milliseconds will be returned. Value returned is in [0,999].
*/
static void getCurrentTime( unsigned long *outSeconds,
unsigned long *outMilliseconds );
/**
* Gets the current time in fractional (double) seconds.
*
* @return the current time in seconds.
*/
static double getCurrentTime();
/**
* Gets the number of milliseconds that have passed
* since a time in seconds and milliseconds.
*
* @param inSeconds the start time, in seconds.
* @param inMilliseconds the start time's additional milliseconds.
*
* @return the number of milliseconds that have passed
* since inSeconds:inMilliseconds. May overflow if
* more than 49 days have passed (assuming 32-bit longs).
*/
static unsigned long getMillisecondsSince(
unsigned long inSeconds, unsigned long inMilliseconds );
};
inline double Time::getCurrentTime() {
unsigned long currentTimeS;
unsigned long currentTimeMS;
getCurrentTime( ¤tTimeS, ¤tTimeMS );
return currentTimeS + currentTimeMS / 1000.0;
}
inline unsigned long Time::getMillisecondsSince(
unsigned long inSeconds, unsigned long inMilliseconds ) {
unsigned long currentTimeS;
unsigned long currentTimeMS;
getCurrentTime( ¤tTimeS, ¤tTimeMS );
unsigned long deltaS = ( currentTimeS - inSeconds );
long deltaMS = ( (long)currentTimeMS - (long)inMilliseconds );
// carry, if needed
if( deltaMS < 0 ) {
deltaS--;
deltaMS += 1000;
}
return 1000 * deltaS + deltaMS;
}
#endif
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