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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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children 55f1f1b3e27d
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1 <HTML
2 ><HEAD
3 ><TITLE
4 >Time Examples</TITLE
5 ><META
6 NAME="GENERATOR"
7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
8 "><LINK
9 REL="HOME"
10 TITLE="SDL Library Documentation"
11 HREF="index.html"><LINK
12 REL="UP"
13 TITLE="Examples"
14 HREF="guideexamples.html"><LINK
15 REL="PREVIOUS"
16 TITLE="CDROM Examples"
17 HREF="guidecdromexamples.html"><LINK
18 REL="NEXT"
19 TITLE="SDL Reference"
20 HREF="reference.html"></HEAD
21 ><BODY
22 CLASS="SECT1"
23 BGCOLOR="#FFF8DC"
24 TEXT="#000000"
25 LINK="#0000ee"
26 VLINK="#551a8b"
27 ALINK="#ff0000"
28 ><DIV
29 CLASS="NAVHEADER"
30 ><TABLE
31 WIDTH="100%"
32 BORDER="0"
33 CELLPADDING="0"
34 CELLSPACING="0"
35 ><TR
36 ><TH
37 COLSPAN="3"
38 ALIGN="center"
39 >SDL Library Documentation</TH
40 ></TR
41 ><TR
42 ><TD
43 WIDTH="10%"
44 ALIGN="left"
45 VALIGN="bottom"
46 ><A
47 HREF="guidecdromexamples.html"
48 >Prev</A
49 ></TD
50 ><TD
51 WIDTH="80%"
52 ALIGN="center"
53 VALIGN="bottom"
54 >Chapter 4. Examples</TD
55 ><TD
56 WIDTH="10%"
57 ALIGN="right"
58 VALIGN="bottom"
59 ><A
60 HREF="reference.html"
61 >Next</A
62 ></TD
63 ></TR
64 ></TABLE
65 ><HR
66 ALIGN="LEFT"
67 WIDTH="100%"></DIV
68 ><DIV
69 CLASS="SECT1"
70 ><H1
71 CLASS="SECT1"
72 ><A
73 NAME="GUIDETIMEEXAMPLES"
74 >Time Examples</A
75 ></H1
76 ><P
77 ></P
78 ><DIV
79 CLASS="SECT2"
80 ><H2
81 CLASS="SECT2"
82 ><A
83 NAME="AEN373"
84 >Time based game loop</A
85 ></H2
86 ><P
87 ><PRE
88 CLASS="PROGRAMLISTING"
89 >#define TICK_INTERVAL 30
90
91 Uint32 TimeLeft(void)
92 {
93 static Uint32 next_time = 0;
94 Uint32 now;
95
96 now = SDL_GetTicks();
97 if ( next_time &#60;= now ) {
98 next_time = now+TICK_INTERVAL;
99 return(0);
100 }
101 return(next_time-now);
102 }
103
104
105 /* main game loop
106
107 while ( game_running ) {
108 UpdateGameState();
109 SDL_Delay(TimeLeft());
110 }&#13;</PRE
111 ></P
112 ></DIV
113 ></DIV
114 ><DIV
115 CLASS="NAVFOOTER"
116 ><HR
117 ALIGN="LEFT"
118 WIDTH="100%"><TABLE
119 WIDTH="100%"
120 BORDER="0"
121 CELLPADDING="0"
122 CELLSPACING="0"
123 ><TR
124 ><TD
125 WIDTH="33%"
126 ALIGN="left"
127 VALIGN="top"
128 ><A
129 HREF="guidecdromexamples.html"
130 >Prev</A
131 ></TD
132 ><TD
133 WIDTH="34%"
134 ALIGN="center"
135 VALIGN="top"
136 ><A
137 HREF="index.html"
138 >Home</A
139 ></TD
140 ><TD
141 WIDTH="33%"
142 ALIGN="right"
143 VALIGN="top"
144 ><A
145 HREF="reference.html"
146 >Next</A
147 ></TD
148 ></TR
149 ><TR
150 ><TD
151 WIDTH="33%"
152 ALIGN="left"
153 VALIGN="top"
154 >CDROM Examples</TD
155 ><TD
156 WIDTH="34%"
157 ALIGN="center"
158 VALIGN="top"
159 ><A
160 HREF="guideexamples.html"
161 >Up</A
162 ></TD
163 ><TD
164 WIDTH="33%"
165 ALIGN="right"
166 VALIGN="top"
167 >SDL Reference</TD
168 ></TR
169 ></TABLE
170 ></DIV
171 ></BODY
172 ></HTML
173 >