Mercurial > sdl-ios-xcode
annotate docs/html/sdlsemwait.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> |
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date | Tue, 24 Mar 2009 10:43:53 +0000 |
parents | 355632dca928 |
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rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_SemWait</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="Multi-threaded Programming" | |
14 HREF="thread.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_DestroySemaphore" | |
17 HREF="sdldestroysemaphore.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_SemTryWait" | |
20 HREF="sdlsemtrywait.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="sdldestroysemaphore.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="sdlsemtrywait.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="SDLSEMWAIT" | |
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74 ></A |
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75 >SDL_SemWait</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN8023" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_SemWait -- Lock a semaphore and suspend the thread if the semaphore value is zero.</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN8026" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN8027" |
0 | 95 ></A |
96 ><P | |
97 ></P | |
98 ><PRE | |
99 CLASS="FUNCSYNOPSISINFO" | |
100 >#include "SDL.h" | |
101 #include "SDL_thread.h"</PRE | |
102 ><P | |
103 ><CODE | |
104 ><CODE | |
105 CLASS="FUNCDEF" | |
106 >int <B | |
107 CLASS="FSFUNC" | |
108 >SDL_SemWait</B | |
109 ></CODE | |
110 >(SDL_sem *sem);</CODE | |
111 ></P | |
112 ><P | |
113 ></P | |
114 ></DIV | |
115 ></DIV | |
116 ><DIV | |
117 CLASS="REFSECT1" | |
118 ><A | |
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119 NAME="AEN8033" |
0 | 120 ></A |
121 ><H2 | |
122 >Description</H2 | |
123 ><P | |
124 ><TT | |
125 CLASS="FUNCTION" | |
126 >SDL_SemWait()</TT | |
127 > suspends the calling thread until either | |
128 the semaphore pointed to by <TT | |
129 CLASS="PARAMETER" | |
130 ><I | |
131 >sem</I | |
132 ></TT | |
133 > has a positive value, | |
134 the call is interrupted by a signal or error. If the call is successful it | |
135 will atomically decrement the semaphore value.</P | |
136 ><P | |
137 >After <TT | |
138 CLASS="FUNCTION" | |
139 >SDL_SemWait()</TT | |
140 > is successful, the semaphore | |
141 can be released and its count atomically incremented by a successful call to | |
142 <A | |
143 HREF="sdlsempost.html" | |
144 >SDL_SemPost</A | |
145 >.</P | |
146 ></DIV | |
147 ><DIV | |
148 CLASS="REFSECT1" | |
149 ><A | |
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150 NAME="AEN8041" |
0 | 151 ></A |
152 ><H2 | |
153 >Return Value</H2 | |
154 ><P | |
155 >Returns <SPAN | |
156 CLASS="RETURNVALUE" | |
157 >0</SPAN | |
158 > if successful or | |
159 <SPAN | |
160 CLASS="RETURNVALUE" | |
161 >-1</SPAN | |
162 > if there was an error (leaving the semaphore unchanged).</P | |
163 ></DIV | |
164 ><DIV | |
165 CLASS="REFSECT1" | |
166 ><A | |
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167 NAME="AEN8046" |
0 | 168 ></A |
169 ><H2 | |
170 >Examples</H2 | |
171 ><P | |
172 ><PRE | |
173 CLASS="PROGRAMLISTING" | |
174 >if (SDL_SemWait(my_sem) == -1) { | |
175 return WAIT_FAILED; | |
176 } | |
177 | |
178 ... | |
179 | |
180 SDL_SemPost(my_sem);</PRE | |
181 ></P | |
182 ></DIV | |
183 ><DIV | |
184 CLASS="REFSECT1" | |
185 ><A | |
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186 NAME="AEN8050" |
0 | 187 ></A |
188 ><H2 | |
189 >See Also</H2 | |
190 ><P | |
191 ><A | |
192 HREF="sdlcreatesemaphore.html" | |
193 ><TT | |
194 CLASS="FUNCTION" | |
195 >SDL_CreateSemaphore</TT | |
196 ></A | |
197 >, | |
198 <A | |
199 HREF="sdldestroysemaphore.html" | |
200 ><TT | |
201 CLASS="FUNCTION" | |
202 >SDL_DestroySemaphore</TT | |
203 ></A | |
204 >, | |
205 <A | |
206 HREF="sdlsemtrywait.html" | |
207 ><TT | |
208 CLASS="FUNCTION" | |
209 >SDL_SemTryWait</TT | |
210 ></A | |
211 >, | |
212 <A | |
213 HREF="sdlsemwaittimeout.html" | |
214 ><TT | |
215 CLASS="FUNCTION" | |
216 >SDL_SemWaitTimeout</TT | |
217 ></A | |
218 >, | |
219 <A | |
220 HREF="sdlsempost.html" | |
221 ><TT | |
222 CLASS="FUNCTION" | |
223 >SDL_SemPost</TT | |
224 ></A | |
225 >, | |
226 <A | |
227 HREF="sdlsemvalue.html" | |
228 ><TT | |
229 CLASS="FUNCTION" | |
230 >SDL_SemValue</TT | |
231 ></A | |
232 ></P | |
233 ></DIV | |
234 ><DIV | |
235 CLASS="NAVFOOTER" | |
236 ><HR | |
237 ALIGN="LEFT" | |
238 WIDTH="100%"><TABLE | |
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239 SUMMARY="Footer navigation table" |
0 | 240 WIDTH="100%" |
241 BORDER="0" | |
242 CELLPADDING="0" | |
243 CELLSPACING="0" | |
244 ><TR | |
245 ><TD | |
246 WIDTH="33%" | |
247 ALIGN="left" | |
248 VALIGN="top" | |
249 ><A | |
250 HREF="sdldestroysemaphore.html" | |
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251 ACCESSKEY="P" |
0 | 252 >Prev</A |
253 ></TD | |
254 ><TD | |
255 WIDTH="34%" | |
256 ALIGN="center" | |
257 VALIGN="top" | |
258 ><A | |
259 HREF="index.html" | |
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260 ACCESSKEY="H" |
0 | 261 >Home</A |
262 ></TD | |
263 ><TD | |
264 WIDTH="33%" | |
265 ALIGN="right" | |
266 VALIGN="top" | |
267 ><A | |
268 HREF="sdlsemtrywait.html" | |
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269 ACCESSKEY="N" |
0 | 270 >Next</A |
271 ></TD | |
272 ></TR | |
273 ><TR | |
274 ><TD | |
275 WIDTH="33%" | |
276 ALIGN="left" | |
277 VALIGN="top" | |
278 >SDL_DestroySemaphore</TD | |
279 ><TD | |
280 WIDTH="34%" | |
281 ALIGN="center" | |
282 VALIGN="top" | |
283 ><A | |
284 HREF="thread.html" | |
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285 ACCESSKEY="U" |
0 | 286 >Up</A |
287 ></TD | |
288 ><TD | |
289 WIDTH="33%" | |
290 ALIGN="right" | |
291 VALIGN="top" | |
292 >SDL_SemTryWait</TD | |
293 ></TR | |
294 ></TABLE | |
295 ></DIV | |
296 ></BODY | |
297 ></HTML | |
298 > |