Mercurial > sdl-ios-xcode
annotate docs/html/sdlsemwait.html @ 2884:9dde605c7540
Date: Fri, 19 Dec 2008 20:17:35 +0100
From: Couriersud
Subject: Re: Aw: Experience using SDL1.3 in sdlmame/Proposal for api additions
> For consistency you'd probably want:
> SDL_SetRenderDrawColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a);
> SDL_SetRenderDrawBlendMode(SDL_BlendMode blendMode);
> SDL_RenderLine(int x1, int y1, int x2, int y2);
> SDL_RenderFill(SDL_Rect *rect);
>
> You probably also want to add API functions query the current state.
>
I have implemented the above api for the opengl, x11, directfb and
software renderers. I have also renamed *TEXTUREBLENDMODE* constants to
BLENDMODE*. The unix build compiles. The windows renderer still needs to
be updated, but I have no windows development machine at hand. Have a
look at the x11 renderer for a sample.
Vector games now run at 90% both on opengl and directfb in comparison to
sdlmame's own opengl renderer. The same applies to raster games.
The diff also includes
a) Changed XDrawRect to XFillRect in x11 renderer
b) A number of changes to fix blending and modulation issues in the
directfb renderer.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 20 Dec 2008 12:00:00 +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 > |