Mercurial > sdl-ios-xcode
annotate docs/html/sdlsettimer.html @ 821:30168104389f
Date: Sat, 14 Feb 2004 14:52:40 +0200
From: "Mike Gorchak"
Subject: Batch of the QNX6 fixes for the SDL
1. Updated readme.QNX
2. Fixed crashes during intensive window updating under fast machines (got over 200 rectangles for update).
3. Fixed double-buffered fullscreen modes, now it works as needed.
4. Fixed Photon detection algorithm.
5. Fixed HWSURFACE update function.
6. Added SDL_PHOTON_FULLSCREEN_REFRESH environment variable support for control refresh rates under Photon.
7. Added 640x400 fullscreen mode emulation via 640x480 (if videodriver not supports original 640x400 mode of course) shifted by 40 vertical pixels from begin, to center it. It's needed for some old DOS games which ran in doubled 320x200 mode.
8. Added available video ram amount support.
8. Added hardware surface allocation/deallocation support if current videomode and videodriver supports it.
9. Added hardware filling support.
10. Added hardware blits support (simple and colorkeyed).
And I've added to testvidinfo test color-keyed blits benchmark (maybe need to add alpha blits benchmark too ?). Currently Photon not supporting any alpha hardware blittings (all drivers lack of alpha blitting code support, only software alpha blitting exist in photon, which is hundreds times slowest than the SDL's one). So I've not added the alpha support. I suppose new QNX 6.3 will have the hardware alpha support, so when it will be done, I'll add alpha support.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 14 Feb 2004 20:22:21 +0000 |
parents | 355632dca928 |
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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 > |