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annotate docs/html/sdladdtimer.html @ 1295:c3e36ac8a94c
Date: Sun, 6 Mar 2005 17:06:20 +0100
From: Per Inge Mathisen
Subject: [SDL] Fullscreen refresh on win32
Windows has a terrible default for fullscreen 3D apps of 60mhz refresh
rate. This can be fixed by the user by going into his driver's
control panel and forcing the refresh rate higher. However, this not a
very user friendly way about it, and in any case SDL contains no code
that could figure out this that condition has afflicted the user.
So the question is, could SDL fix this for the user? It is possible
under Windows to request a higher refresh rate. The danger is of
course that if the user has an old monitor, and you request a too high
refresh rate, the monitor could be damaged. However, I believe there
might be a way around that: Check before switching what refresh rate
the user's desktop runs in, and if our fullscreen dimensions are equal
or less than those of the desktop, use the higher refresh rate of 60
and the desktop rate.
Since most users run their desktops in the same or higher resolution
something sane, this should fix this problem for most users.
Thoughts?
An alternative is to add an SDL_GL_GetAttribute(SDL_GL_REFRESH_RATE)
option so that programs can bitch at their users at their own
convenience.
- Per
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 30 Jan 2006 06:56:10 +0000 |
| parents | 355632dca928 |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_AddTimer</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_Delay" | |
| 17 HREF="sdldelay.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_RemoveTimer" | |
| 20 HREF="sdlremovetimer.html"></HEAD | |
| 21 ><BODY | |
| 22 CLASS="REFENTRY" | |
| 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="sdldelay.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 ></TD | |
| 57 ><TD | |
| 58 WIDTH="10%" | |
| 59 ALIGN="right" | |
| 60 VALIGN="bottom" | |
| 61 ><A | |
| 62 HREF="sdlremovetimer.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 ><H1 | |
| 72 ><A | |
| 73 NAME="SDLADDTIMER" | |
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74 ></A |
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75 >SDL_AddTimer</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN8482" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_AddTimer -- Add a timer which will call a callback after the specified number of milliseconds has | |
| 84 elapsed.</DIV | |
| 85 ><DIV | |
| 86 CLASS="REFSYNOPSISDIV" | |
| 87 ><A | |
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88 NAME="AEN8485" |
| 0 | 89 ></A |
| 90 ><H2 | |
| 91 >Synopsis</H2 | |
| 92 ><DIV | |
| 93 CLASS="FUNCSYNOPSIS" | |
| 94 ><A | |
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95 NAME="AEN8486" |
| 0 | 96 ></A |
| 97 ><P | |
| 98 ></P | |
| 99 ><PRE | |
| 100 CLASS="FUNCSYNOPSISINFO" | |
| 101 >#include "SDL.h"</PRE | |
| 102 ><P | |
| 103 ><CODE | |
| 104 ><CODE | |
| 105 CLASS="FUNCDEF" | |
| 106 >SDL_TimerID <B | |
| 107 CLASS="FSFUNC" | |
| 108 >SDL_AddTimer</B | |
| 109 ></CODE | |
| 110 >(Uint32 interval, SDL_NewTimerCallback callback, void *param);</CODE | |
| 111 ></P | |
| 112 ><P | |
| 113 ></P | |
| 114 ></DIV | |
| 115 ></DIV | |
| 116 ><DIV | |
| 117 CLASS="REFSECT1" | |
| 118 ><A | |
| 119 NAME="SDLNEWTIMERCALLBACK" | |
| 120 ></A | |
| 121 ><H2 | |
| 122 >Callback</H2 | |
| 123 ><PRE | |
| 124 CLASS="PROGRAMLISTING" | |
| 125 >/* type definition for the "new" timer callback function */ | |
| 126 typedef Uint32 (*SDL_NewTimerCallback)(Uint32 interval, void *param);</PRE | |
| 127 ></DIV | |
| 128 ><DIV | |
| 129 CLASS="REFSECT1" | |
| 130 ><A | |
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131 NAME="AEN8495" |
| 0 | 132 ></A |
| 133 ><H2 | |
| 134 >Description</H2 | |
| 135 ><P | |
| 136 >Adds a callback function to be run after the specified number of | |
| 137 milliseconds has elapsed. The callback function is passed the current | |
| 138 timer interval and the user supplied parameter from the | |
| 139 <TT | |
| 140 CLASS="FUNCTION" | |
| 141 >SDL_AddTimer</TT | |
| 142 > call and returns the next timer | |
| 143 interval. If the returned value from the callback is the same as the one | |
| 144 passed in, the periodic alarm continues, otherwise a new alarm is | |
| 145 scheduled.</P | |
| 146 ><P | |
| 147 >To cancel a currently running timer call | |
| 148 <A | |
| 149 HREF="sdlremovetimer.html" | |
| 150 >SDL_RemoveTimer</A | |
| 151 > with the | |
| 152 timer ID returned from | |
| 153 <TT | |
| 154 CLASS="FUNCTION" | |
| 155 >SDL_AddTimer</TT | |
| 156 >.</P | |
| 157 ><P | |
| 158 >The timer callback function may run in a different thread than your | |
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159 main program, and so shouldn't call any functions from within itself. |
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160 You may always call <A |
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161 HREF="sdlpushevent.html" |
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162 >SDL_PushEvent</A |
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163 >, however.</P |
| 0 | 164 ><P |
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165 >The granularity of the timer is platform-dependent, but you should count |
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166 on it being at least 10 ms as this is the most common number. |
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167 This means that if |
| 0 | 168 you request a 16 ms timer, your callback will run approximately 20 ms |
| 169 later on an unloaded system. If you wanted to set a flag signaling | |
| 170 a frame update at 30 frames per second (every 33 ms), you might set a | |
| 171 timer for 30 ms (see example below). | |
| 172 | |
| 173 If you use this function, you need to pass <TT | |
| 174 CLASS="LITERAL" | |
| 175 >SDL_INIT_TIMER</TT | |
| 176 > | |
| 177 to <A | |
| 178 HREF="sdlinit.html" | |
| 179 >SDL_Init</A | |
| 180 >.</P | |
| 181 ></DIV | |
| 182 ><DIV | |
| 183 CLASS="REFSECT1" | |
| 184 ><A | |
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185 NAME="AEN8507" |
| 0 | 186 ></A |
| 187 ><H2 | |
| 188 >Return Value</H2 | |
| 189 ><P | |
| 190 >Returns an ID value for the added timer or | |
| 191 <SPAN | |
| 192 CLASS="RETURNVALUE" | |
| 193 >NULL</SPAN | |
| 194 > if there was an error.</P | |
| 195 ></DIV | |
| 196 ><DIV | |
| 197 CLASS="REFSECT1" | |
| 198 ><A | |
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199 NAME="AEN8511" |
| 0 | 200 ></A |
| 201 ><H2 | |
| 202 >Examples</H2 | |
| 203 ><P | |
| 204 ><PRE | |
| 205 CLASS="PROGRAMLISTING" | |
| 206 >my_timer_id = SDL_AddTimer((33/10)*10, my_callbackfunc, my_callback_param);</PRE | |
| 207 ></P | |
| 208 ></DIV | |
| 209 ><DIV | |
| 210 CLASS="REFSECT1" | |
| 211 ><A | |
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212 NAME="AEN8515" |
| 0 | 213 ></A |
| 214 ><H2 | |
| 215 >See Also</H2 | |
| 216 ><P | |
| 217 ><A | |
| 218 HREF="sdlremovetimer.html" | |
| 219 ><TT | |
| 220 CLASS="FUNCTION" | |
| 221 >SDL_RemoveTimer</TT | |
| 222 ></A | |
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223 >, |
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224 <A |
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225 HREF="sdlpushevent.html" |
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226 ><TT |
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227 CLASS="FUNCTION" |
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228 >SDL_PushEvent</TT |
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229 ></A |
| 0 | 230 ></P |
| 231 ></DIV | |
| 232 ><DIV | |
| 233 CLASS="NAVFOOTER" | |
| 234 ><HR | |
| 235 ALIGN="LEFT" | |
| 236 WIDTH="100%"><TABLE | |
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237 SUMMARY="Footer navigation table" |
| 0 | 238 WIDTH="100%" |
| 239 BORDER="0" | |
| 240 CELLPADDING="0" | |
| 241 CELLSPACING="0" | |
| 242 ><TR | |
| 243 ><TD | |
| 244 WIDTH="33%" | |
| 245 ALIGN="left" | |
| 246 VALIGN="top" | |
| 247 ><A | |
| 248 HREF="sdldelay.html" | |
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249 ACCESSKEY="P" |
| 0 | 250 >Prev</A |
| 251 ></TD | |
| 252 ><TD | |
| 253 WIDTH="34%" | |
| 254 ALIGN="center" | |
| 255 VALIGN="top" | |
| 256 ><A | |
| 257 HREF="index.html" | |
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258 ACCESSKEY="H" |
| 0 | 259 >Home</A |
| 260 ></TD | |
| 261 ><TD | |
| 262 WIDTH="33%" | |
| 263 ALIGN="right" | |
| 264 VALIGN="top" | |
| 265 ><A | |
| 266 HREF="sdlremovetimer.html" | |
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267 ACCESSKEY="N" |
| 0 | 268 >Next</A |
| 269 ></TD | |
| 270 ></TR | |
| 271 ><TR | |
| 272 ><TD | |
| 273 WIDTH="33%" | |
| 274 ALIGN="left" | |
| 275 VALIGN="top" | |
| 276 >SDL_Delay</TD | |
| 277 ><TD | |
| 278 WIDTH="34%" | |
| 279 ALIGN="center" | |
| 280 VALIGN="top" | |
| 281 ><A | |
| 282 HREF="time.html" | |
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283 ACCESSKEY="U" |
| 0 | 284 >Up</A |
| 285 ></TD | |
| 286 ><TD | |
| 287 WIDTH="33%" | |
| 288 ALIGN="right" | |
| 289 VALIGN="top" | |
| 290 >SDL_RemoveTimer</TD | |
| 291 ></TR | |
| 292 ></TABLE | |
| 293 ></DIV | |
| 294 ></BODY | |
| 295 ></HTML | |
| 296 > |