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/*
This file is part of Warzone 2100.
Copyright (C) 2008-2020 Warzone 2100 Project
Warzone 2100 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.
Warzone 2100 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 Warzone 2100; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "lib/framework/frame.h"
#include "timer.h"
#if defined(WZ_OS_UNIX)
# include <sys/time.h>
#endif
static double startTimeInMicroSec = 0; // starting time in microseconds
static double endTimeInMicroSec = 0; // ending time in microseconds
static bool stopped = false; // stop flag
static struct timeval startCount;
static struct timeval endCount;
#if defined(WZ_OS_WIN)
/**
* The difference between the FAT32 and Unix epoch.
*
* The FAT32 epoch starts at 1 January 1601 while the Unix epoch starts at 1
* January 1970. And apparently we gained 3.25 days in that time period.
*
* Thus the amount of micro seconds passed between these dates can be computed
* as follows:
* \f[((1970 - 1601) \cdot 365.25 + 3.25) \cdot 86400 \cdot 1000000\f]
*
* Use 1461 and 13 instead of 365.25 and 3.25 respectively because we can't use
* floating point math here.
*/
static const uint64_t usecs_between_fat32_and_unix_epoch = (uint64_t)((1970 - 1601) * 1461 + 13) * (uint64_t)86400 / (uint64_t)4 * (uint64_t)1000000;
int gettimeofday(struct timeval *tv, struct timezone *tz)
{
ASSERT(tz == NULL, "This gettimeofday implementation doesn't provide timezone info.");
if (tv)
{
FILETIME ft;
uint64_t systime, usec;
/* Retrieve the current time expressed as 100 nano-second
* intervals since 1 January 1601 (UTC).
*/
GetSystemTimeAsFileTime(&ft);
systime = ((uint64_t)ft.dwHighDateTime << 32) | ft.dwLowDateTime;
// Convert to micro seconds since 1 January 1970 (UTC).
usec = systime / 10 - usecs_between_fat32_and_unix_epoch;
tv->tv_sec = usec / (uint64_t)1000000;
tv->tv_usec = usec % (uint64_t)1000000;
}
return 0;
}
#endif
// Uses the highest resolution timers avail on windows & linux
void Timer_Init(void)
{
startCount.tv_sec = startCount.tv_usec = 0;
endCount.tv_sec = endCount.tv_usec = 0;
stopped = false;
startTimeInMicroSec = 0;
endTimeInMicroSec = 0;
}
void Timer_start(void)
{
stopped = false; // reset stop flag
gettimeofday(&startCount, nullptr);
}
void Timer_stop(void)
{
stopped = true; // set timer stopped flag
gettimeofday(&endCount, nullptr);
}
double Timer_getElapsedMicroSecs(void)
{
if (!stopped)
{
gettimeofday(&endCount, nullptr);
}
startTimeInMicroSec = (startCount.tv_sec * 1000000.0) + startCount.tv_usec;
endTimeInMicroSec = (endCount.tv_sec * 1000000.0) + endCount.tv_usec;
return endTimeInMicroSec - startTimeInMicroSec;
}
double Timer_getElapsedMilliSecs(void)
{
return Timer_getElapsedMicroSecs() * 0.001;
}
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