attract/extlibs/gameswf/base/tu_timer.cpp

// tu_timer.cpp	-- by Thatcher Ulrich <[email protected]>

// This source code has been donated to the Public Domain.  Do
// whatever you want with it.

// Utility/profiling timer.

#ifdef __FreeBSD__
#include <chrono>
#else
#include <sys/timeb.h>	// for ftime()
#endif
#include <assert.h>
#include "base/tu_timer.h"

#ifdef __FreeBSD__
// static timeb s_start_time;
static std::chrono::steady_clock::time_point s_start_time;
#else
static timeb s_start_time;
#endif
void tu_timer::init_timer()
{
#ifdef __FreeBSD__
	s_start_time = std::chrono::steady_clock::now();
#else
	ftime(&s_start_time);
#endif
}

Uint32 tu_timer::get_ticks()
{
#ifdef __FreeBSD__
	auto now = std::chrono::steady_clock::now();
	auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(now - s_start_time).count();
	return static_cast<int>(elapsed);
#else
	struct timeb tv;
	ftime(&tv);
	return  (tv.time - s_start_time.time) * 1000 + (tv.millitm - s_start_time.millitm);
#endif
}

tu_datetime::tu_datetime()
{
	m_time = (time_t) tu_timer::get_systime();
}

// Returns the date for the specified Date object in milliseconds since midnight on January 1, 1970, 
double tu_datetime::get_time() const
{
	return (double) m_time * 1000;	// *1000 means that time in milliseconds
}

// Sets the date for the specified Date object in milliseconds since midnight on January 1, 1970, 
void tu_datetime::set_time(double t)
{
	m_time = (time_t) (t / 1000);
}

int tu_datetime::get(part part)
{
	struct tm* gmt = localtime(&m_time);
	if (gmt)
	{
		switch (part)
		{
		case FULLYEAR:
			return gmt->tm_year + 1900;
			break;

		case YEAR:
			return gmt->tm_year;
			break;

		case MON:
			return gmt->tm_mon;
			break;

		case MDAY:
			// Returns the day of the month (an integer from 1 to 31)
			return gmt->tm_mday;

		case WDAY:
			// Returns the day of the month (an integer from 1 to 31)
			return gmt->tm_wday;

		case HOUR:
			// Returns the hour (an integer from 0 to 23)
			return gmt->tm_hour;
			break;

		case MIN:
			return gmt->tm_min;
			break;

		case SEC:
			return gmt->tm_sec;
			break;

		default:
			assert(0);
		}
	}
	return -1;
}

void tu_datetime::set(part part, int val)
{
	struct tm* gmt = localtime(&m_time);
	if (gmt)
	{
		switch (part)
		{
		case FULLYEAR:
			gmt->tm_year = val - 1900;	// (current year minus 1900).
			break;

		case YEAR:
			gmt->tm_year = val;
			break;

		case MON:
			gmt->tm_mon = val;
			break;

		case MDAY:
			gmt->tm_mday = val;
			break;

		case WDAY:
			gmt->tm_wday = val;
			break;

		case HOUR:
			gmt->tm_hour = val;
			break;

		case MIN:
			gmt->tm_min = val;
			break;

		case SEC:
			gmt->tm_sec = val;
			break;

		default:
			assert(0);
		}
		m_time = mktime(gmt);
	}
}


Uint64 tu_timer::get_systime()
{
	time_t ltime;
	time(&ltime);
	return (Uint64) ltime;
}

#ifdef _WIN32

#include <windows.h>

void tu_timer::sleep(int milliseconds)
{
	::Sleep(milliseconds);
}


uint64	tu_timer::get_profile_ticks()
{
	// @@ use rdtsc?

	LARGE_INTEGER	li;
	QueryPerformanceCounter(&li);

	return li.QuadPart;
}


double	tu_timer::profile_ticks_to_seconds(uint64 ticks)
{
	LARGE_INTEGER	freq;
	QueryPerformanceFrequency(&freq);

	double	seconds = (double) ticks;
	seconds /= (double) freq.QuadPart;

	return seconds;
}

#else	// not _WIN32


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


// The profile ticks implementation is just fine for a normal timer.

void tu_timer::sleep(int milliseconds)
{
	usleep(milliseconds * 1000);
}


uint64	tu_timer::get_profile_ticks()
{
	// @@ TODO prefer rdtsc when available?

	// Return microseconds.
	struct timeval tv;
	uint64 result;
	
	gettimeofday(&tv, 0);

	result = tv.tv_sec * 1000000;
	result += tv.tv_usec;
	
	return result;
}


double	tu_timer::profile_ticks_to_seconds(uint64 ticks)
{
	// ticks is microseconds.  Convert to seconds.
	return ticks / 1000000.0;
}

double	tu_timer::profile_ticks_to_milliseconds(uint64 ticks)
{
	// ticks is microseconds.  Convert to milliseconds.
	return ticks / 1000.0;
}

#endif	// not _WIN32


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