worldspawn/src/timer.h

/*
   Copyright (C) 2001-2006, William Joseph.
   All Rights Reserved.

   This file is part of GtkRadiant.

   GtkRadiant is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   GtkRadiant is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined ( INCLUDED_TIMER_H )
#define INCLUDED_TIMER_H

#if 1

const int msec_per_sec = 1000;

class MillisecondTime {
unsigned int m_milliseconds;
public:
MillisecondTime(unsigned int milliseconds)
	: m_milliseconds(milliseconds)
{
}

MillisecondTime()
{
}

static MillisecondTime current();

unsigned int milliseconds_since(const MillisecondTime &other) const
{
	return m_milliseconds - other.m_milliseconds;
}
};

template<typename tick_type>
inline MillisecondTime time_from_ticks(tick_type tick_count, tick_type ticks_per_sec)
{
	return MillisecondTime(
		static_cast<unsigned int>( tick_count / static_cast<double>( ticks_per_sec / msec_per_sec )));
}

#else

const unsigned int usec_per_sec = 1000000;

class MillisecondTime
{
unsigned int m_sec;
unsigned int m_usec;
public:
MillisecondTime( unsigned int sec, unsigned int usec )
	: m_sec( sec ), m_usec( usec ){
}
MillisecondTime(){
}
staticMillisecondTime current();

unsigned int milliseconds_since( const MillisecondTime& other ) const {
	return static_cast<unsigned int>( ( m_sec * static_cast<double>( usec_per_sec ) + m_usec )
	                                  - ( other.m_sec * static_cast<double>( usec_per_sec ) + other.m_usec ) ) / 1000;
}
};

template<typename tick_type>
inline MillisecondTime time_from_ticks( tick_type tick_count, tick_type ticks_per_sec ){
	return MillisecondTime( static_cast<unsigned int>( tick_count / ticks_per_sec ),
	                        static_cast<unsigned int>( ( tick_count % ticks_per_sec ) * ( usec_per_sec / static_cast<double>( ticks_per_sec ) ) ) );
}

#endif

class Timer {
MillisecondTime m_start;

public:
void start()
{
	m_start = MillisecondTime::current();
}

unsigned int elapsed_msec()
{
	return MillisecondTime::current().milliseconds_since(m_start);
}
};

#endif