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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 | |
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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 ) { |
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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 > |