Mercurial > sdl-ios-xcode
annotate docs/html/sdlsettimer.html @ 3100:7dc982143c06
Date: Sun, 22 Mar 2009 12:52:29 +0000
From: Luke Benstead
Subject: OpenGL 3.0 Context Creation
I've attached a patch which implements OpenGL 3.x context creation on
the latest SVN. I've added two options to SDL_GL_SetAttribute, these
are SDL_GL_CONTEXT_MAJOR_VERSION and SDL_GL_CONTEXT_MINOR_VERSION.
These default to 2 and 1 respectively. If the major version is less
than 3 then the current context creation method is used, otherwise the
appropriate new context creation function is called (depending on the
platform).
Sample code:
if (SDL_Init(SDL_INIT_VIDEO) != 0) {
printf("Unable to initialize SDL: %s\n", SDL_GetError());
return 1;
}
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3); //Without these 2 lines, SDL will create a GL 2.x context
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_Surface* screen = SDL_SetVideoMode( 640, 480, 16, SDL_OPENGL | SDL_FULLSCREEN );
I've implemented context creation on both Win32 and X and run basic
tests on both. This patch doesn't provide access to all the options
allowed by the new context creation (e.g. shared contexts, forward
compatible contexts) but they can be added pretty easily.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 24 Mar 2009 10:43:53 +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 > |