Mercurial > sdl-ios-xcode
annotate docs/html/guidetimeexamples.html @ 548:6cd49f896c5a
Open ALSA devices in non-blocking mode (thanks Aleksey!)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 17 Nov 2002 20:02:26 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 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 1.64 |
| 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 | |
| 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 | |
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83 NAME="AEN412" |
| 0 | 84 >Time based game loop</A |
| 85 ></H2 | |
| 86 ><P | |
| 87 ><PRE | |
| 88 CLASS="PROGRAMLISTING" | |
| 89 >#define TICK_INTERVAL 30 | |
| 90 | |
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91 static Uint32 next_time; |
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92 |
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93 Uint32 time_left(void) |
| 0 | 94 { |
| 95 Uint32 now; | |
| 96 | |
| 97 now = SDL_GetTicks(); | |
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98 if(next_time <= now) |
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99 return 0; |
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100 else |
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101 return next_time - now; |
| 0 | 102 } |
| 103 | |
| 104 | |
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105 /* main game loop */ |
| 0 | 106 |
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107 next_time = SDL_GetTicks() + TICK_INTERVAL; |
| 0 | 108 while ( game_running ) { |
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109 update_game_state(); |
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110 SDL_Delay(time_left()); |
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111 next_time += TICK_INTERVAL; |
| 0 | 112 } </PRE |
| 113 ></P | |
| 114 ></DIV | |
| 115 ></DIV | |
| 116 ><DIV | |
| 117 CLASS="NAVFOOTER" | |
| 118 ><HR | |
| 119 ALIGN="LEFT" | |
| 120 WIDTH="100%"><TABLE | |
| 121 WIDTH="100%" | |
| 122 BORDER="0" | |
| 123 CELLPADDING="0" | |
| 124 CELLSPACING="0" | |
| 125 ><TR | |
| 126 ><TD | |
| 127 WIDTH="33%" | |
| 128 ALIGN="left" | |
| 129 VALIGN="top" | |
| 130 ><A | |
| 131 HREF="guidecdromexamples.html" | |
| 132 >Prev</A | |
| 133 ></TD | |
| 134 ><TD | |
| 135 WIDTH="34%" | |
| 136 ALIGN="center" | |
| 137 VALIGN="top" | |
| 138 ><A | |
| 139 HREF="index.html" | |
| 140 >Home</A | |
| 141 ></TD | |
| 142 ><TD | |
| 143 WIDTH="33%" | |
| 144 ALIGN="right" | |
| 145 VALIGN="top" | |
| 146 ><A | |
| 147 HREF="reference.html" | |
| 148 >Next</A | |
| 149 ></TD | |
| 150 ></TR | |
| 151 ><TR | |
| 152 ><TD | |
| 153 WIDTH="33%" | |
| 154 ALIGN="left" | |
| 155 VALIGN="top" | |
| 156 >CDROM Examples</TD | |
| 157 ><TD | |
| 158 WIDTH="34%" | |
| 159 ALIGN="center" | |
| 160 VALIGN="top" | |
| 161 ><A | |
| 162 HREF="guideexamples.html" | |
| 163 >Up</A | |
| 164 ></TD | |
| 165 ><TD | |
| 166 WIDTH="33%" | |
| 167 ALIGN="right" | |
| 168 VALIGN="top" | |
| 169 >SDL Reference</TD | |
| 170 ></TR | |
| 171 ></TABLE | |
| 172 ></DIV | |
| 173 ></BODY | |
| 174 ></HTML | |
| 175 > |