Mercurial > sdl-ios-xcode
annotate docs/html/sdljoysticknumballs.html @ 896:b56dc586a5ef
Date: Tue, 16 Mar 2004 12:40:33 +0000
From: Alan Swanson
Subject: [SDL] [PATCH] Linux joystick evdev axis count fix
The event device configuration under Linux does not check the returned
ioctl value when reading the axis information. This means extra
undefined axes are returned.
Note, in EV_HandleEvents, the default for case EV_ABS is to return any
axis information which is fine as we have already checked for all valid
absolute axes. No new axes should be returned after opening the device.
(Unless, of course, the evdev allows closing and reassigning a new
device while in use and I can't believe that happens.)
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 16 May 2004 22:48:06 +0000 |
parents | 355632dca928 |
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rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_JoystickNumBalls</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="Joystick" | |
14 HREF="joystick.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_JoystickNumAxes" | |
17 HREF="sdljoysticknumaxes.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_JoystickNumHats" | |
20 HREF="sdljoysticknumhats.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="sdljoysticknumaxes.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="sdljoysticknumhats.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="SDLJOYSTICKNUMBALLS" | |
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74 ></A |
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75 >SDL_JoystickNumBalls</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN6212" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_JoystickNumBalls -- Get the number of joystick trackballs</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN6215" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN6216" |
0 | 95 ></A |
96 ><P | |
97 ></P | |
98 ><PRE | |
99 CLASS="FUNCSYNOPSISINFO" | |
100 >#include "SDL.h"</PRE | |
101 ><P | |
102 ><CODE | |
103 ><CODE | |
104 CLASS="FUNCDEF" | |
105 >int <B | |
106 CLASS="FSFUNC" | |
107 >SDL_JoystickNumBalls</B | |
108 ></CODE | |
109 >(SDL_Joystick *joystick);</CODE | |
110 ></P | |
111 ><P | |
112 ></P | |
113 ></DIV | |
114 ></DIV | |
115 ><DIV | |
116 CLASS="REFSECT1" | |
117 ><A | |
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118 NAME="AEN6222" |
0 | 119 ></A |
120 ><H2 | |
121 >Description</H2 | |
122 ><P | |
123 >Return the number of trackballs available from a previously opened <SPAN | |
124 CLASS="STRUCTNAME" | |
125 >SDL_Joystick</SPAN | |
126 >.</P | |
127 ></DIV | |
128 ><DIV | |
129 CLASS="REFSECT1" | |
130 ><A | |
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131 NAME="AEN6226" |
0 | 132 ></A |
133 ><H2 | |
134 >Return Value</H2 | |
135 ><P | |
136 >Number of trackballs.</P | |
137 ></DIV | |
138 ><DIV | |
139 CLASS="REFSECT1" | |
140 ><A | |
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141 NAME="AEN6229" |
0 | 142 ></A |
143 ><H2 | |
144 >See Also</H2 | |
145 ><P | |
146 ><A | |
147 HREF="sdljoystickgetball.html" | |
148 ><TT | |
149 CLASS="FUNCTION" | |
150 >SDL_JoystickGetBall</TT | |
151 ></A | |
152 >, | |
153 <A | |
154 HREF="sdljoystickopen.html" | |
155 ><TT | |
156 CLASS="FUNCTION" | |
157 >SDL_JoystickOpen</TT | |
158 ></A | |
159 ></P | |
160 ></DIV | |
161 ><DIV | |
162 CLASS="NAVFOOTER" | |
163 ><HR | |
164 ALIGN="LEFT" | |
165 WIDTH="100%"><TABLE | |
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166 SUMMARY="Footer navigation table" |
0 | 167 WIDTH="100%" |
168 BORDER="0" | |
169 CELLPADDING="0" | |
170 CELLSPACING="0" | |
171 ><TR | |
172 ><TD | |
173 WIDTH="33%" | |
174 ALIGN="left" | |
175 VALIGN="top" | |
176 ><A | |
177 HREF="sdljoysticknumaxes.html" | |
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178 ACCESSKEY="P" |
0 | 179 >Prev</A |
180 ></TD | |
181 ><TD | |
182 WIDTH="34%" | |
183 ALIGN="center" | |
184 VALIGN="top" | |
185 ><A | |
186 HREF="index.html" | |
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187 ACCESSKEY="H" |
0 | 188 >Home</A |
189 ></TD | |
190 ><TD | |
191 WIDTH="33%" | |
192 ALIGN="right" | |
193 VALIGN="top" | |
194 ><A | |
195 HREF="sdljoysticknumhats.html" | |
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196 ACCESSKEY="N" |
0 | 197 >Next</A |
198 ></TD | |
199 ></TR | |
200 ><TR | |
201 ><TD | |
202 WIDTH="33%" | |
203 ALIGN="left" | |
204 VALIGN="top" | |
205 >SDL_JoystickNumAxes</TD | |
206 ><TD | |
207 WIDTH="34%" | |
208 ALIGN="center" | |
209 VALIGN="top" | |
210 ><A | |
211 HREF="joystick.html" | |
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212 ACCESSKEY="U" |
0 | 213 >Up</A |
214 ></TD | |
215 ><TD | |
216 WIDTH="33%" | |
217 ALIGN="right" | |
218 VALIGN="top" | |
219 >SDL_JoystickNumHats</TD | |
220 ></TR | |
221 ></TABLE | |
222 ></DIV | |
223 ></BODY | |
224 ></HTML | |
225 > |