Some questions

SDL Development
1

Hi everybody,
How can I calculate the fps in a game?
I don’t understand how can I enable the key repeat usign only SDL api…
any one can help me?
tnx

2

How can I calculate the fps in a game?

get timer before a frame (timer = A)
get timer before next frame (timer = B)
fps = 1 / (B - A)

3

Hi everybody,
How can I calculate the fps in a game?

Count the number of frames and divide by the number of seconds it took
to draw them. Frames/seconds == frames per second == fps

I don’t understand how can I enable the key repeat usign only SDL api…

http://sdldoc.csn.ul.ie/sdlenablekeyrepeat.php If that doesn’t do it for
you, I don’t know what can.

any one can help me?
tnx

	Bob PendletonOn Tue, 2003-07-08 at 16:05, NighTiger wrote:

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4

“Bob Pendleton” wrote in message
news:mailman.1057700344.27358.sdl at libsdl.org…

Hi everybody,
How can I calculate the fps in a game?

Count the number of frames and divide by the number of seconds it took
to draw them. Frames/seconds == frames per second == fps

Just to add to what bob said: you should take a sample (ie 10 frames).
Something like this.

sample = 10; //sample every 10 frames

//This will need to be called once at the start as well.
void reset()
{
count = 0;
time = getTime();
}

void draw()
{
drawframe();
count++;
if (count == sample)
{
fps = count/(getTime()-time);
reset();
}
}

If you don’t take a sample, your results will:

  1. be counting the fps for the entire program, so eventually, it’ll get
    stuck on some number and generally you don’t want to take inital program
    delays into account.
  2. will eventually overflow the number count.> On Tue, 2003-07-08 at 16:05, NighTiger wrote:

I don’t understand how can I enable the key repeat usign only SDL api…

http://sdldoc.csn.ul.ie/sdlenablekeyrepeat.php If that doesn’t do it for
you, I don’t know what can.

any one can help me?
tnx

Bob Pendleton

SDL mailing list
SDL at libsdl.org
http://www.libsdl.org/mailman/listinfo/sdl
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