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Everything Unix Technical

Started by GameDev.net August 25, 1999 11:21 AM

1 comment, last by GameDev.net 24 years, 10 months ago

Nurgle

269

August 24, 1999 10:10 AM

In the main game loop, have something like:

int prev_time;

struct timeval tv;

while( 1 )
{
gettimeofday( &tv, NULL );
if( ((tv.tv_usec) - prev_time) < MIN_DELAY )
{
prev_time = (tv.tv_usec);
MainGameLoop();
}
}

(MIN_DELAY is the minimum microseconds between each game cycle)

I'm not sure if the tv.u_sec is microseconds from current second, or total microseconds seconds since Jan 1st 1970...

do a man gettimeofday...

------------------
Mark Collnis
- EHB Software

[This message has been edited by Godfree^ (edited August 24, 1999).]

After careful deliberation, I have come to the conclusion that Nazrix is not cool. I am sorry for any inconvienience my previous mistake may have caused. We now return you to the original programming

Anonymous

August 25, 1999 11:21 AM

Hi, I have reasonable experience with writing Win32 games. I'm now considering writing games for Linux. One thing I find that is sorely missing is a good reference book or two for Linux game programming. There are tons of books out there for Win32 game programming though... Anyway, I need to know how to control game speed under Linux? I use Win32 functions like SetTimer(...), QueryPerformanceCounter(...), and timeGetTime(...). But I have no clue what to use for Linux? How do you guys do it? Thanks in advance!

Sengir

122

August 25, 1999 11:21 AM

Hi.
gettimeofday() is one possibility.
you can also use an event driven callback timer, which you set with setitimer().
after you've set the frequency(max 100 Hz, because of system timer, same in windows I think) you have to set the SIGALRM signal handler to an own function through signal().
note that sleep() and usleep() do not work anymore, because a SIGALRM signal forces the program to go on.

cu,
Sengir

--
Sengir

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