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annotate docs/html/guidetimeexamples.html @ 1271:092722dbc766
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author | Sam Lantinga <slouken@libsdl.org> |
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date | Thu, 26 Jan 2006 07:38:43 +0000 |
parents | 355632dca928 |
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rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >Time Examples</TITLE | |
5 ><META | |
6 NAME="GENERATOR" | |
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
0 | 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 | |
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31 SUMMARY="Header navigation table" |
0 | 32 WIDTH="100%" |
33 BORDER="0" | |
34 CELLPADDING="0" | |
35 CELLSPACING="0" | |
36 ><TR | |
37 ><TH | |
38 COLSPAN="3" | |
39 ALIGN="center" | |
40 >SDL Library Documentation</TH | |
41 ></TR | |
42 ><TR | |
43 ><TD | |
44 WIDTH="10%" | |
45 ALIGN="left" | |
46 VALIGN="bottom" | |
47 ><A | |
48 HREF="guidecdromexamples.html" | |
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49 ACCESSKEY="P" |
0 | 50 >Prev</A |
51 ></TD | |
52 ><TD | |
53 WIDTH="80%" | |
54 ALIGN="center" | |
55 VALIGN="bottom" | |
56 >Chapter 4. Examples</TD | |
57 ><TD | |
58 WIDTH="10%" | |
59 ALIGN="right" | |
60 VALIGN="bottom" | |
61 ><A | |
62 HREF="reference.html" | |
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63 ACCESSKEY="N" |
0 | 64 >Next</A |
65 ></TD | |
66 ></TR | |
67 ></TABLE | |
68 ><HR | |
69 ALIGN="LEFT" | |
70 WIDTH="100%"></DIV | |
71 ><DIV | |
72 CLASS="SECT1" | |
73 ><H1 | |
74 CLASS="SECT1" | |
75 ><A | |
76 NAME="GUIDETIMEEXAMPLES" | |
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77 ></A |
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78 >Time Examples</H1 |
0 | 79 ><P |
80 ></P | |
81 ><DIV | |
82 CLASS="SECT2" | |
83 ><H2 | |
84 CLASS="SECT2" | |
85 ><A | |
55
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86 NAME="AEN412" |
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87 ></A |
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88 >Time based game loop</H2 |
0 | 89 ><P |
90 ><PRE | |
91 CLASS="PROGRAMLISTING" | |
92 >#define TICK_INTERVAL 30 | |
93 | |
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94 static Uint32 next_time; |
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95 |
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96 Uint32 time_left(void) |
0 | 97 { |
98 Uint32 now; | |
99 | |
100 now = SDL_GetTicks(); | |
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101 if(next_time <= now) |
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102 return 0; |
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103 else |
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104 return next_time - now; |
0 | 105 } |
106 | |
107 | |
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108 /* main game loop */ |
0 | 109 |
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110 next_time = SDL_GetTicks() + TICK_INTERVAL; |
0 | 111 while ( game_running ) { |
181
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112 update_game_state(); |
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113 SDL_Delay(time_left()); |
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114 next_time += TICK_INTERVAL; |
0 | 115 } </PRE |
116 ></P | |
117 ></DIV | |
118 ></DIV | |
119 ><DIV | |
120 CLASS="NAVFOOTER" | |
121 ><HR | |
122 ALIGN="LEFT" | |
123 WIDTH="100%"><TABLE | |
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124 SUMMARY="Footer navigation table" |
0 | 125 WIDTH="100%" |
126 BORDER="0" | |
127 CELLPADDING="0" | |
128 CELLSPACING="0" | |
129 ><TR | |
130 ><TD | |
131 WIDTH="33%" | |
132 ALIGN="left" | |
133 VALIGN="top" | |
134 ><A | |
135 HREF="guidecdromexamples.html" | |
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136 ACCESSKEY="P" |
0 | 137 >Prev</A |
138 ></TD | |
139 ><TD | |
140 WIDTH="34%" | |
141 ALIGN="center" | |
142 VALIGN="top" | |
143 ><A | |
144 HREF="index.html" | |
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145 ACCESSKEY="H" |
0 | 146 >Home</A |
147 ></TD | |
148 ><TD | |
149 WIDTH="33%" | |
150 ALIGN="right" | |
151 VALIGN="top" | |
152 ><A | |
153 HREF="reference.html" | |
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154 ACCESSKEY="N" |
0 | 155 >Next</A |
156 ></TD | |
157 ></TR | |
158 ><TR | |
159 ><TD | |
160 WIDTH="33%" | |
161 ALIGN="left" | |
162 VALIGN="top" | |
163 >CDROM Examples</TD | |
164 ><TD | |
165 WIDTH="34%" | |
166 ALIGN="center" | |
167 VALIGN="top" | |
168 ><A | |
169 HREF="guideexamples.html" | |
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170 ACCESSKEY="U" |
0 | 171 >Up</A |
172 ></TD | |
173 ><TD | |
174 WIDTH="33%" | |
175 ALIGN="right" | |
176 VALIGN="top" | |
177 >SDL Reference</TD | |
178 ></TR | |
179 ></TABLE | |
180 ></DIV | |
181 ></BODY | |
182 ></HTML | |
183 > |