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<Smerdyakov>
carm = Carmelo Piccione?
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<async>
how would you go about making your own caml toplevel?
<async>
as in writing a custom one
<teratorn>
what for? :)
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<Maddas>
hmm
<Maddas>
Looks like there isn't any pure O'Caml code that calculates CRC32s
<Maddas>
When writing that in an efficient way, would speed be comparable to the speed of some C code doing the same thing?
<Maddas>
s/speed/execution speed/
<karryall>
no idea
<mattam>
i suppose you're efficient impl uses references ?
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<madroach>
Hello, I'm just trying to program the game "pong" and have performance problems doing so. I use the graphics library with auto_syncronize false and clear and refresh the screen every 0.01 seconds. Are there any hints ??
<madroach>
I use a Pentium 166
<cehteh>
why clear the full screen?
<madroach>
It is hard work to manually use the "rubber" and remove the "tail" of the ball.
<Smerdyakov>
Clearing the full screen is the usual way.
<madroach>
First I tried to draw a black ball with a white circle around it.
<Smerdyakov>
100 frames per second is faster than television cartoons. :)
<cehteh>
anything above 25 frames is ok ... dont go too high
<madroach>
A part of my main loop is: if time -. Unix.gettimeofday () > 0 then (* refresh *);
<cehteh>
busy-loop?
<madroach>
No, in every iteration of the loop I increment time by 0.01.
<cehteh>
huh
<madroach>
Got it, how it works ?
<cehteh>
no
<cehteh>
i would usleep() or such
<madroach>
I use a loop in which I only iterate time by 0.01 and calculate the position of the ball.
<madroach>
At the end of the loop I test if I have some time left to refresh the screen. But thanks for the tip with usleep(), I used a "busy recursion" for sleeping.
<cehteh>
ah
<vegai>
what's that?
<cehteh>
thats what i meant by busy-loop
<cehteh>
thats bad
<madroach>
Wait one minute I'll try it with the usleep.
<cehteh>
and next, you only need to calculate the position of the ball on every frame .. not every 0.01 sec
<cehteh>
.. and next .. how do you calculate the position of the ball?
<karryall>
... except ocaml doesn't have usleep
<cehteh>
i am not an ocaml programmer .. but i guess there is some form of sleep
<cehteh>
maybe sleep with a float? .. his time to RTFM
<karryall>
there is sleep but it sleeps a (integer) number of seconds
<cehteh>
ah
<karryall>
madroach: you could use ocamlsdl
<cehteh>
and select() ?
<madroach>
karryall: I'm just learning objective caml. SDL is too hard jet.
<karryall>
yes, that's the canonical workaround
<madroach>
s/j/y
<madroach>
In which module is usleep ??
<cehteh>
read above :)
<cehteh>
no usleep
<madroach>
shit
<cehteh>
use select() .. that should be somewhere near the networking stuff
<cehteh>
arent ocaml functions generic ... note to the developers, why not provide a sleep which takes a float ... thats a common portable solution
<karryall>
first, AFAIK, there are no developers here, so no use making notes to them :)
<karryall>
and I'm not sure it's that portable
<karryall>
these time functions have a tendency to interact with signals in non-portable ways
<madroach>
Using the Unix.select it raises the exception Unix.Unix_error(11, "select", "")
<karryall>
humpf, yes, that's EINTR
<cehteh>
defines ocaml signal handlers?
<madroach>
What is EINTR
<madroach>
??
<cehteh>
interupt
<madroach>
ok
<karryall>
standard unix error 'Function interrupted by signal'
<madroach>
Well I also thought about using the timer functions for letting the program "wake up" when the time has passed, but this seemed too complicated to me.
<cehteh>
is there no library for eventqueues in ocaml?
<karryall>
madroach: it is complicated because the Graphics modul is already using timers and/or signals internally
<karryall>
cehteh: waht do you mean eventqueues ?
<cehteh>
a priority_queue ordered by time where events can be scheduled .. including all the wait stuff etc
<karryall>
there's Equeue , written by G. Stolpmann
<cehteh>
i would use such a thing for game programming
<karryall>
well, no, you would use ocamlsdl
<karryall>
:)
<cehteh>
i am not in game programming anyways
<cehteh>
and a pong game cries for ncurses!
<madroach>
cehteh: fine I only know ocaml for three months :)
<cehteh>
madroach: i know it for some longer but dont use it :)
<madroach>
karryall: OK, thanks now it runs a bit better than with the busy loop.
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<madroach>
...But still it doesn't look very pretty
<karryall>
use ocamlsdl if you want it to be pretty
<cehteh>
ncurses :)
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<madroach>
well, than there's no chance of doing it with the graphics library - it's a pitty...
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<Maddas>
mattam: I didn't implement CRC32
<Maddas>
mattam: I don't know anything about CRC32 yet, but if I can achieve similar speeds (a few percent slower won't matter of course) with O'Caml, I'll try to write my own.
<mattam>
you can
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