/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/blenlib/intern/time.c
 *  \ingroup bli
 */


#include "PIL_time.h"

#ifdef WIN32
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x501 /* Windows XP or newer */
#endif
#define WIN32_LEAN_AND_MEAN
#include <windows.h>

double PIL_check_seconds_timer(void) 
{
	static int hasperfcounter = -1; /* (-1 == unknown) */
	static double perffreq;

	if (hasperfcounter == -1) {
		__int64 ifreq;
		hasperfcounter = QueryPerformanceFrequency((LARGE_INTEGER *) &ifreq);
		perffreq = (double) ifreq;
	}

	if (hasperfcounter) {
		__int64 count;

		QueryPerformanceCounter((LARGE_INTEGER *) &count);

		return count / perffreq;
	}
	else {
		static double accum = 0.0;
		static int ltick = 0;
		int ntick = GetTickCount();

		if (ntick < ltick) {
			accum += (0xFFFFFFFF - ltick + ntick) / 1000.0;
		}
		else {
			accum += (ntick - ltick) / 1000.0;
		}

		ltick = ntick;
		return accum;
	}
}

long int PIL_check_seconds_timer_i(void)
{
	return (long int)PIL_check_seconds_timer();
}

void PIL_sleep_ms(int ms)
{
	Sleep(ms);
}

#else

#include <unistd.h>
#include <sys/time.h>

double PIL_check_seconds_timer(void) 
{
	struct timeval tv;
	struct timezone tz;

	gettimeofday(&tv, &tz);

	return ((double) tv.tv_sec + tv.tv_usec / 1000000.0);
}

long int PIL_check_seconds_timer_i(void)
{
	struct timeval tv;
	struct timezone tz;

	gettimeofday(&tv, &tz);

	return tv.tv_sec;
}

void PIL_sleep_ms(int ms)
{
	if (ms >= 1000) {
		sleep(ms / 1000);
		ms = (ms % 1000);
	}
	
	usleep(ms * 1000);
}

#endif
