forked from KolibriOS/kolibrios
173 lines
2.2 KiB
HTML
173 lines
2.2 KiB
HTML
|
<HTML
|
||
|
|
><HEAD
|
||
|
|
><TITLE
|
||
|
|
>Time Examples</TITLE
|
||
|
|
><META
|
||
|
|
NAME="GENERATOR"
|
||
|
|
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
|
||
|
|
"><LINK
|
||
|
|
REL="HOME"
|
||
|
|
TITLE="SDL Library Documentation"
|
||
|
|
HREF="index.html"><LINK
|
||
|
|
REL="UP"
|
||
|
|
TITLE="Examples"
|
||
|
|
HREF="guideexamples.html"><LINK
|
||
|
|
REL="PREVIOUS"
|
||
|
|
TITLE="CDROM Examples"
|
||
|
|
HREF="guidecdromexamples.html"><LINK
|
||
|
|
REL="NEXT"
|
||
|
|
TITLE="SDL Reference"
|
||
|
|
HREF="reference.html"></HEAD
|
||
|
|
><BODY
|
||
|
|
CLASS="SECT1"
|
||
|
|
BGCOLOR="#FFF8DC"
|
||
|
|
TEXT="#000000"
|
||
|
|
LINK="#0000ee"
|
||
|
|
VLINK="#551a8b"
|
||
|
|
ALINK="#ff0000"
|
||
|
|
><DIV
|
||
|
|
CLASS="NAVHEADER"
|
||
|
|
><TABLE
|
||
|
|
WIDTH="100%"
|
||
|
|
BORDER="0"
|
||
|
|
CELLPADDING="0"
|
||
|
|
CELLSPACING="0"
|
||
|
|
><TR
|
||
|
|
><TH
|
||
|
|
COLSPAN="3"
|
||
|
|
ALIGN="center"
|
||
|
|
>SDL Library Documentation</TH
|
||
|
|
></TR
|
||
|
|
><TR
|
||
|
|
><TD
|
||
|
|
WIDTH="10%"
|
||
|
|
ALIGN="left"
|
||
|
|
VALIGN="bottom"
|
||
|
|
><A
|
||
|
|
HREF="guidecdromexamples.html"
|
||
|
|
>Prev</A
|
||
|
|
></TD
|
||
|
|
><TD
|
||
|
|
WIDTH="80%"
|
||
|
|
ALIGN="center"
|
||
|
|
VALIGN="bottom"
|
||
|
|
>Chapter 4. Examples</TD
|
||
|
|
><TD
|
||
|
|
WIDTH="10%"
|
||
|
|
ALIGN="right"
|
||
|
|
VALIGN="bottom"
|
||
|
|
><A
|
||
|
|
HREF="reference.html"
|
||
|
|
>Next</A
|
||
|
|
></TD
|
||
|
|
></TR
|
||
|
|
></TABLE
|
||
|
|
><HR
|
||
|
|
ALIGN="LEFT"
|
||
|
|
WIDTH="100%"></DIV
|
||
|
|
><DIV
|
||
|
|
CLASS="SECT1"
|
||
|
|
><H1
|
||
|
|
CLASS="SECT1"
|
||
|
|
><A
|
||
|
|
NAME="GUIDETIMEEXAMPLES"
|
||
|
|
>Time Examples</A
|
||
|
|
></H1
|
||
|
|
><P
|
||
|
|
></P
|
||
|
|
><DIV
|
||
|
|
CLASS="SECT2"
|
||
|
|
><H2
|
||
|
|
CLASS="SECT2"
|
||
|
|
><A
|
||
|
|
NAME="AEN412"
|
||
|
|
>Time based game loop</A
|
||
|
|
></H2
|
||
|
|
><P
|
||
|
|
><PRE
|
||
|
|
CLASS="PROGRAMLISTING"
|
||
|
|
>#define TICK_INTERVAL 30
|
||
|
|
|
||
|
|
Uint32 TimeLeft(void)
|
||
|
|
{
|
||
|
|
static Uint32 next_time = 0;
|
||
|
|
Uint32 now;
|
||
|
|
|
||
|
|
now = SDL_GetTicks();
|
||
|
|
if ( next_time <= now ) {
|
||
|
|
next_time = now+TICK_INTERVAL;
|
||
|
|
return(0);
|
||
|
|
}
|
||
|
|
return(next_time-now);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* main game loop
|
||
|
|
|
||
|
|
while ( game_running ) {
|
||
|
|
UpdateGameState();
|
||
|
|
SDL_Delay(TimeLeft());
|
||
|
|
} </PRE
|
||
|
|
></P
|
||
|
|
></DIV
|
||
|
|
></DIV
|
||
|
|
><DIV
|
||
|
|
CLASS="NAVFOOTER"
|
||
|
|
><HR
|
||
|
|
ALIGN="LEFT"
|
||
|
|
WIDTH="100%"><TABLE
|
||
|
|
WIDTH="100%"
|
||
|
|
BORDER="0"
|
||
|
|
CELLPADDING="0"
|
||
|
|
CELLSPACING="0"
|
||
|
|
><TR
|
||
|
|
><TD
|
||
|
|
WIDTH="33%"
|
||
|
|
ALIGN="left"
|
||
|
|
VALIGN="top"
|
||
|
|
><A
|
||
|
|
HREF="guidecdromexamples.html"
|
||
|
|
>Prev</A
|
||
|
|
></TD
|
||
|
|
><TD
|
||
|
|
WIDTH="34%"
|
||
|
|
ALIGN="center"
|
||
|
|
VALIGN="top"
|
||
|
|
><A
|
||
|
|
HREF="index.html"
|
||
|
|
>Home</A
|
||
|
|
></TD
|
||
|
|
><TD
|
||
|
|
WIDTH="33%"
|
||
|
|
ALIGN="right"
|
||
|
|
VALIGN="top"
|
||
|
|
><A
|
||
|
|
HREF="reference.html"
|
||
|
|
>Next</A
|
||
|
|
></TD
|
||
|
|
></TR
|
||
|
|
><TR
|
||
|
|
><TD
|
||
|
|
WIDTH="33%"
|
||
|
|
ALIGN="left"
|
||
|
|
VALIGN="top"
|
||
|
|
>CDROM Examples</TD
|
||
|
|
><TD
|
||
|
|
WIDTH="34%"
|
||
|
|
ALIGN="center"
|
||
|
|
VALIGN="top"
|
||
|
|
><A
|
||
|
|
HREF="guideexamples.html"
|
||
|
|
>Up</A
|
||
|
|
></TD
|
||
|
|
><TD
|
||
|
|
WIDTH="33%"
|
||
|
|
ALIGN="right"
|
||
|
|
VALIGN="top"
|
||
|
|
>SDL Reference</TD
|
||
|
|
></TR
|
||
|
|
></TABLE
|
||
|
|
></DIV
|
||
|
|
></BODY
|
||
|
|
></HTML
|
||
|
|
>
|