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annotate docs/html/guideaudioexamples.html @ 983:7f08bd66f1ca
Date: Fri, 19 Nov 2004 06:23:53 -0800 (PST)
From: Eric Wing
Subject: OS X Mouse inversion problem fix (again)
Here's yet another patch for the OS X mouse inversion
problem. This should fix the problem once and for all.
I know I've said this before, but *This time for
sure!* :)
If you recall, my last patch broke the non-OpenGL
windowed code and caused the inversion to occur there
instead. Max submitted a patch that partially reverted
the changes back which included the os version hack
which is currently the most recent CVS.
Aaron Sullivan identified and reported to the mailing
list the other day, that the last partial regression
of the code broke OS X 10.2. Looking over the results,
I'm thinking that I was slightly more successful than
I thought at unifying the code. I think I was trying
to unify the code base for OpenGL and non-OpenGL
windowed modes for all versions of the OS. It looks
like I failed at at unifying the OpenGL and non-OpenGL
code, but I did succeed at unifying the OS versions.
Thus, we no longer need the hack for the OS version
checks. The partial regression still included an OS
check which is what broke things for < 10.3.
Attached is the patch for SDL_QuartzWM.m. It basically
is a half-line change that removes one of the two
checks that decides if the mouse coordinates need to
be inverted, i.e:
if (system_version >= 0x1030 &&
(SDL_VideoSurface->flags & SDL_OPENGL) )
becomes this:
if(SDL_VideoSurface->flags & SDL_OPENGL)
With Aaron's outstanding help, we have collectively
tested:
windowed OpenGL
windowed non-OpenGL
fullscreen OpenGL
fullscreen non-OpenGL
under OS X 10.2 (Jaguar), 10.3 (Panther), and 10.4
(Tiger).
We don't have access to 10.0 or 10.1, but since the
original problem didn't materialize until 10.3, I'm
hopeful that testing 10.2 is sufficient. And now that
the code is uniform, I'm also hoping we'll be safe
moving forward to deal with future revisions of the OS
with this issue.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 21 Nov 2004 00:57:47 +0000 |
parents | 355632dca928 |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >Audio Examples</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="Examples" | |
14 HREF="guideexamples.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="Event Examples" | |
17 HREF="guideeventexamples.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="CDROM Examples" | |
20 HREF="guidecdromexamples.html"></HEAD | |
21 ><BODY | |
22 CLASS="SECT1" | |
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="guideeventexamples.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 >Chapter 4. Examples</TD | |
57 ><TD | |
58 WIDTH="10%" | |
59 ALIGN="right" | |
60 VALIGN="bottom" | |
61 ><A | |
62 HREF="guidecdromexamples.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 ><DIV | |
72 CLASS="SECT1" | |
73 ><H1 | |
74 CLASS="SECT1" | |
75 ><A | |
76 NAME="GUIDEAUDIOEXAMPLES" | |
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77 ></A |
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78 >Audio Examples</H1 |
0 | 79 ><P |
80 ></P | |
81 ><DIV | |
82 CLASS="SECT2" | |
83 ><H2 | |
84 CLASS="SECT2" | |
85 ><A | |
55
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86 NAME="AEN382" |
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87 ></A |
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88 >Opening the audio device</H2 |
0 | 89 ><P |
90 ><PRE | |
91 CLASS="PROGRAMLISTING" | |
92 > SDL_AudioSpec wanted; | |
93 extern void fill_audio(void *udata, Uint8 *stream, int len); | |
94 | |
95 /* Set the audio format */ | |
96 wanted.freq = 22050; | |
97 wanted.format = AUDIO_S16; | |
98 wanted.channels = 2; /* 1 = mono, 2 = stereo */ | |
99 wanted.samples = 1024; /* Good low-latency value for callback */ | |
100 wanted.callback = fill_audio; | |
101 wanted.userdata = NULL; | |
102 | |
103 /* Open the audio device, forcing the desired format */ | |
104 if ( SDL_OpenAudio(&wanted, NULL) < 0 ) { | |
105 fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError()); | |
106 return(-1); | |
107 } | |
108 return(0);</PRE | |
109 ></P | |
110 ></DIV | |
111 ><DIV | |
112 CLASS="SECT2" | |
113 ><H2 | |
114 CLASS="SECT2" | |
115 ><A | |
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116 NAME="AEN386" |
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117 ></A |
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118 >Playing audio</H2 |
0 | 119 ><P |
120 ><PRE | |
121 CLASS="PROGRAMLISTING" | |
122 > static Uint8 *audio_chunk; | |
123 static Uint32 audio_len; | |
124 static Uint8 *audio_pos; | |
125 | |
126 /* The audio function callback takes the following parameters: | |
127 stream: A pointer to the audio buffer to be filled | |
128 len: The length (in bytes) of the audio buffer | |
129 */ | |
130 void fill_audio(void *udata, Uint8 *stream, int len) | |
131 { | |
132 /* Only play if we have data left */ | |
133 if ( audio_len == 0 ) | |
134 return; | |
135 | |
136 /* Mix as much data as possible */ | |
137 len = ( len > audio_len ? audio_len : len ); | |
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138 SDL_MixAudio(stream, audio_pos, len, SDL_MIX_MAXVOLUME); |
0 | 139 audio_pos += len; |
140 audio_len -= len; | |
141 } | |
142 | |
143 /* Load the audio data ... */ | |
144 | |
145 ;;;;; | |
146 | |
147 audio_pos = audio_chunk; | |
148 | |
149 /* Let the callback function play the audio chunk */ | |
150 SDL_PauseAudio(0); | |
151 | |
152 /* Do some processing */ | |
153 | |
154 ;;;;; | |
155 | |
156 /* Wait for sound to complete */ | |
157 while ( audio_len > 0 ) { | |
158 SDL_Delay(100); /* Sleep 1/10 second */ | |
159 } | |
160 SDL_CloseAudio();</PRE | |
161 ></P | |
162 ></DIV | |
163 ></DIV | |
164 ><DIV | |
165 CLASS="NAVFOOTER" | |
166 ><HR | |
167 ALIGN="LEFT" | |
168 WIDTH="100%"><TABLE | |
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169 SUMMARY="Footer navigation table" |
0 | 170 WIDTH="100%" |
171 BORDER="0" | |
172 CELLPADDING="0" | |
173 CELLSPACING="0" | |
174 ><TR | |
175 ><TD | |
176 WIDTH="33%" | |
177 ALIGN="left" | |
178 VALIGN="top" | |
179 ><A | |
180 HREF="guideeventexamples.html" | |
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181 ACCESSKEY="P" |
0 | 182 >Prev</A |
183 ></TD | |
184 ><TD | |
185 WIDTH="34%" | |
186 ALIGN="center" | |
187 VALIGN="top" | |
188 ><A | |
189 HREF="index.html" | |
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190 ACCESSKEY="H" |
0 | 191 >Home</A |
192 ></TD | |
193 ><TD | |
194 WIDTH="33%" | |
195 ALIGN="right" | |
196 VALIGN="top" | |
197 ><A | |
198 HREF="guidecdromexamples.html" | |
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199 ACCESSKEY="N" |
0 | 200 >Next</A |
201 ></TD | |
202 ></TR | |
203 ><TR | |
204 ><TD | |
205 WIDTH="33%" | |
206 ALIGN="left" | |
207 VALIGN="top" | |
208 >Event Examples</TD | |
209 ><TD | |
210 WIDTH="34%" | |
211 ALIGN="center" | |
212 VALIGN="top" | |
213 ><A | |
214 HREF="guideexamples.html" | |
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215 ACCESSKEY="U" |
0 | 216 >Up</A |
217 ></TD | |
218 ><TD | |
219 WIDTH="33%" | |
220 ALIGN="right" | |
221 VALIGN="top" | |
222 >CDROM Examples</TD | |
223 ></TR | |
224 ></TABLE | |
225 ></DIV | |
226 ></BODY | |
227 ></HTML | |
228 > |