Mercurial > sdl-ios-xcode
annotate docs/html/sdlsettimer.html @ 1585:980d2a0dc2a3
Date: Tue, 4 Mar 2003 15:05:31 -0800
From: "Jim"
Subject: [SDL] Frame Buffer patches...
Okay I'm new at patch generation - so please tell me if there's a better way
I could have done this.
Attached are two patch files generated with 'cvs diff -u'
SDL-fb-open-lock.patch applies to SDL_fbvideo.c
Modifies the open loop to check /dev/fb/0 found on devfs...
Modifies the lock code to return failure if the current virtual terminal
is not the one opened for frame buffer writing...
Lock would hang forever if switched away (ctrl-alt-F1) ...
SDL-fb-mousedrv-screensave.patch applies to SDL_fbevents.c
Switches default mouse mode based on SDL_MOUSEDRV - currently only
accepts PS2 - otherwise default is MS Mouse.
When the screen is switched - exisiting code (wrapped in ifdef
SAVE_SCREEN_COTENTS) would save the wrong bit of the screen....
( I run frame buffer 1600x1200, the size I requested was 800x600 - the
save would save the top 800 lines (non biased) and restore them... Adding
screen->offset fixed that )
However, if that option is not set, then a call to SDL_UpdateRect (full
screen) is made. (which may have had it's contents changed since the screen
is not entirely locked because of lock-failure patch)
Jim
[patches slightly tweaked for SDL 1.2.10]
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 22 Mar 2006 07:48:22 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SetTimer</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="Time" | |
| 14 HREF="time.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_RemoveTimer" | |
| 17 HREF="sdlremovetimer.html"></HEAD | |
| 18 ><BODY | |
| 19 CLASS="REFENTRY" | |
| 20 BGCOLOR="#FFF8DC" | |
| 21 TEXT="#000000" | |
| 22 LINK="#0000ee" | |
| 23 VLINK="#551a8b" | |
| 24 ALINK="#ff0000" | |
| 25 ><DIV | |
| 26 CLASS="NAVHEADER" | |
| 27 ><TABLE | |
|
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28 SUMMARY="Header navigation table" |
| 0 | 29 WIDTH="100%" |
| 30 BORDER="0" | |
| 31 CELLPADDING="0" | |
| 32 CELLSPACING="0" | |
| 33 ><TR | |
| 34 ><TH | |
| 35 COLSPAN="3" | |
| 36 ALIGN="center" | |
| 37 >SDL Library Documentation</TH | |
| 38 ></TR | |
| 39 ><TR | |
| 40 ><TD | |
| 41 WIDTH="10%" | |
| 42 ALIGN="left" | |
| 43 VALIGN="bottom" | |
| 44 ><A | |
| 45 HREF="sdlremovetimer.html" | |
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46 ACCESSKEY="P" |
| 0 | 47 >Prev</A |
| 48 ></TD | |
| 49 ><TD | |
| 50 WIDTH="80%" | |
| 51 ALIGN="center" | |
| 52 VALIGN="bottom" | |
| 53 ></TD | |
| 54 ><TD | |
| 55 WIDTH="10%" | |
| 56 ALIGN="right" | |
| 57 VALIGN="bottom" | |
| 58 > </TD | |
| 59 ></TR | |
| 60 ></TABLE | |
| 61 ><HR | |
| 62 ALIGN="LEFT" | |
| 63 WIDTH="100%"></DIV | |
| 64 ><H1 | |
| 65 ><A | |
| 66 NAME="SDLSETTIMER" | |
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67 ></A |
|
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68 >SDL_SetTimer</H1 |
| 0 | 69 ><DIV |
| 70 CLASS="REFNAMEDIV" | |
| 71 ><A | |
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72 NAME="AEN8557" |
| 0 | 73 ></A |
| 74 ><H2 | |
| 75 >Name</H2 | |
| 76 >SDL_SetTimer -- Set a callback to run after the specified number of milliseconds has | |
| 77 elapsed.</DIV | |
| 78 ><DIV | |
| 79 CLASS="REFSYNOPSISDIV" | |
| 80 ><A | |
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81 NAME="AEN8560" |
| 0 | 82 ></A |
| 83 ><H2 | |
| 84 >Synopsis</H2 | |
| 85 ><DIV | |
| 86 CLASS="FUNCSYNOPSIS" | |
| 87 ><A | |
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88 NAME="AEN8561" |
| 0 | 89 ></A |
| 90 ><P | |
| 91 ></P | |
| 92 ><PRE | |
| 93 CLASS="FUNCSYNOPSISINFO" | |
| 94 >#include "SDL.h"</PRE | |
| 95 ><P | |
| 96 ><CODE | |
| 97 ><CODE | |
| 98 CLASS="FUNCDEF" | |
| 99 >int <B | |
| 100 CLASS="FSFUNC" | |
| 101 >SDL_SetTimer</B | |
| 102 ></CODE | |
| 103 >(Uint32 interval, SDL_TimerCallback callback);</CODE | |
| 104 ></P | |
| 105 ><P | |
| 106 ></P | |
| 107 ></DIV | |
| 108 ></DIV | |
| 109 ><DIV | |
| 110 CLASS="REFSECT1" | |
| 111 ><A | |
| 112 NAME="SDLTIMERCALLBACK" | |
| 113 ></A | |
| 114 ><H2 | |
| 115 >Callback</H2 | |
| 116 ><P | |
| 117 >/* Function prototype for the timer callback function */ | |
| 118 typedef Uint32 (*SDL_TimerCallback)(Uint32 interval);</P | |
| 119 ></DIV | |
| 120 ><DIV | |
| 121 CLASS="REFSECT1" | |
| 122 ><A | |
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123 NAME="AEN8570" |
| 0 | 124 ></A |
| 125 ><H2 | |
| 126 >Description</H2 | |
| 127 ><P | |
| 128 >Set a callback to run after the specified number of milliseconds has | |
| 129 elapsed. The callback function is passed the current timer interval | |
| 130 and returns the next timer interval. If the returned value is the | |
| 131 same as the one passed in, the periodic alarm continues, otherwise a | |
| 132 new alarm is scheduled.</P | |
| 133 ><P | |
| 134 >To cancel a currently running timer, call | |
| 135 <TT | |
| 136 CLASS="FUNCTION" | |
| 137 >SDL_SetTimer(0, NULL);</TT | |
| 138 ></P | |
| 139 ><P | |
| 140 >The timer callback function may run in a different thread than your | |
| 141 main constant, and so shouldn't call any functions from within itself.</P | |
| 142 ><P | |
| 143 >The maximum resolution of this timer is 10 ms, which means that if | |
| 144 you request a 16 ms timer, your callback will run approximately 20 ms | |
| 145 later on an unloaded system. If you wanted to set a flag signaling | |
| 146 a frame update at 30 frames per second (every 33 ms), you might set a | |
| 147 timer for 30 ms (see example below).</P | |
| 148 ><P | |
| 149 >If you use this function, you need to pass <TT | |
| 150 CLASS="LITERAL" | |
| 151 >SDL_INIT_TIMER</TT | |
| 152 > | |
| 153 to <TT | |
| 154 CLASS="FUNCTION" | |
| 155 >SDL_Init()</TT | |
| 156 >.</P | |
| 157 ><DIV | |
| 158 CLASS="NOTE" | |
| 159 ><BLOCKQUOTE | |
| 160 CLASS="NOTE" | |
| 161 ><P | |
| 162 ><B | |
| 163 >Note: </B | |
|
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164 >This function is kept for compatibility but has been superseded |
| 0 | 165 by the new timer functions |
| 166 <A | |
| 167 HREF="sdladdtimer.html" | |
| 168 >SDL_AddTimer</A | |
| 169 > and | |
| 170 <A | |
| 171 HREF="sdlremovetimer.html" | |
| 172 >SDL_RemoveTimer</A | |
| 173 > which support | |
| 174 multiple timers.</P | |
| 175 ></BLOCKQUOTE | |
| 176 ></DIV | |
| 177 ></DIV | |
| 178 ><DIV | |
| 179 CLASS="REFSECT1" | |
| 180 ><A | |
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181 NAME="AEN8584" |
| 0 | 182 ></A |
| 183 ><H2 | |
| 184 >Examples</H2 | |
| 185 ><P | |
| 186 ><PRE | |
| 187 CLASS="PROGRAMLISTING" | |
| 188 >SDL_SetTimer((33/10)*10, my_callback);</PRE | |
| 189 ></P | |
| 190 ></DIV | |
| 191 ><DIV | |
| 192 CLASS="REFSECT1" | |
| 193 ><A | |
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194 NAME="AEN8588" |
| 0 | 195 ></A |
| 196 ><H2 | |
| 197 >See Also</H2 | |
| 198 ><P | |
| 199 ><A | |
| 200 HREF="sdladdtimer.html" | |
| 201 ><TT | |
| 202 CLASS="FUNCTION" | |
| 203 >SDL_AddTimer</TT | |
| 204 ></A | |
| 205 ></P | |
| 206 ></DIV | |
| 207 ><DIV | |
| 208 CLASS="NAVFOOTER" | |
| 209 ><HR | |
| 210 ALIGN="LEFT" | |
| 211 WIDTH="100%"><TABLE | |
|
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212 SUMMARY="Footer navigation table" |
| 0 | 213 WIDTH="100%" |
| 214 BORDER="0" | |
| 215 CELLPADDING="0" | |
| 216 CELLSPACING="0" | |
| 217 ><TR | |
| 218 ><TD | |
| 219 WIDTH="33%" | |
| 220 ALIGN="left" | |
| 221 VALIGN="top" | |
| 222 ><A | |
| 223 HREF="sdlremovetimer.html" | |
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224 ACCESSKEY="P" |
| 0 | 225 >Prev</A |
| 226 ></TD | |
| 227 ><TD | |
| 228 WIDTH="34%" | |
| 229 ALIGN="center" | |
| 230 VALIGN="top" | |
| 231 ><A | |
| 232 HREF="index.html" | |
|
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233 ACCESSKEY="H" |
| 0 | 234 >Home</A |
| 235 ></TD | |
| 236 ><TD | |
| 237 WIDTH="33%" | |
| 238 ALIGN="right" | |
| 239 VALIGN="top" | |
| 240 > </TD | |
| 241 ></TR | |
| 242 ><TR | |
| 243 ><TD | |
| 244 WIDTH="33%" | |
| 245 ALIGN="left" | |
| 246 VALIGN="top" | |
| 247 >SDL_RemoveTimer</TD | |
| 248 ><TD | |
| 249 WIDTH="34%" | |
| 250 ALIGN="center" | |
| 251 VALIGN="top" | |
| 252 ><A | |
| 253 HREF="time.html" | |
|
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254 ACCESSKEY="U" |
| 0 | 255 >Up</A |
| 256 ></TD | |
| 257 ><TD | |
| 258 WIDTH="33%" | |
| 259 ALIGN="right" | |
| 260 VALIGN="top" | |
| 261 > </TD | |
| 262 ></TR | |
| 263 ></TABLE | |
| 264 ></DIV | |
| 265 ></BODY | |
| 266 ></HTML | |
| 267 > |