Mercurial > sdl-ios-xcode
annotate docs/html/sdljoystickgetball.html @ 1295:c3e36ac8a94c
Date: Sun, 6 Mar 2005 17:06:20 +0100
From: Per Inge Mathisen
Subject: [SDL] Fullscreen refresh on win32
Windows has a terrible default for fullscreen 3D apps of 60mhz refresh
rate. This can be fixed by the user by going into his driver's
control panel and forcing the refresh rate higher. However, this not a
very user friendly way about it, and in any case SDL contains no code
that could figure out this that condition has afflicted the user.
So the question is, could SDL fix this for the user? It is possible
under Windows to request a higher refresh rate. The danger is of
course that if the user has an old monitor, and you request a too high
refresh rate, the monitor could be damaged. However, I believe there
might be a way around that: Check before switching what refresh rate
the user's desktop runs in, and if our fullscreen dimensions are equal
or less than those of the desktop, use the higher refresh rate of 60
and the desktop rate.
Since most users run their desktops in the same or higher resolution
something sane, this should fix this problem for most users.
Thoughts?
An alternative is to add an SDL_GL_GetAttribute(SDL_GL_REFRESH_RATE)
option so that programs can bitch at their users at their own
convenience.
- Per
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 30 Jan 2006 06:56:10 +0000 |
parents | 355632dca928 |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_JoystickGetBall</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_JoystickGetButton" | |
17 HREF="sdljoystickgetbutton.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_JoystickClose" | |
20 HREF="sdljoystickclose.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="sdljoystickgetbutton.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="sdljoystickclose.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="SDLJOYSTICKGETBALL" | |
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74 ></A |
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75 >SDL_JoystickGetBall</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN6433" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_JoystickGetBall -- Get relative trackball motion</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN6436" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN6437" |
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_JoystickGetBall</B | |
108 ></CODE | |
109 >(SDL_Joystick *joystick, int ball, int *dx, int *dy);</CODE | |
110 ></P | |
111 ><P | |
112 ></P | |
113 ></DIV | |
114 ></DIV | |
115 ><DIV | |
116 CLASS="REFSECT1" | |
117 ><A | |
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118 NAME="AEN6443" |
0 | 119 ></A |
120 ><H2 | |
121 >Description</H2 | |
122 ><P | |
123 >Get the <TT | |
124 CLASS="PARAMETER" | |
125 ><I | |
126 >ball</I | |
127 ></TT | |
128 > axis change.</P | |
129 ><P | |
130 >Trackballs can only return relative motion since the last call to <TT | |
131 CLASS="FUNCTION" | |
132 >SDL_JoystickGetBall</TT | |
133 >, these motion deltas a placed into <TT | |
134 CLASS="PARAMETER" | |
135 ><I | |
136 >dx</I | |
137 ></TT | |
138 > and <TT | |
139 CLASS="PARAMETER" | |
140 ><I | |
141 >dy</I | |
142 ></TT | |
143 >.</P | |
144 ></DIV | |
145 ><DIV | |
146 CLASS="REFSECT1" | |
147 ><A | |
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148 NAME="AEN6451" |
0 | 149 ></A |
150 ><H2 | |
151 >Return Value</H2 | |
152 ><P | |
153 >Returns <SPAN | |
154 CLASS="RETURNVALUE" | |
155 >0</SPAN | |
156 > on success or <SPAN | |
157 CLASS="RETURNVALUE" | |
158 >-1</SPAN | |
159 > on failure</P | |
160 ></DIV | |
161 ><DIV | |
162 CLASS="REFSECT1" | |
163 ><A | |
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164 NAME="AEN6456" |
0 | 165 ></A |
166 ><H2 | |
167 >Examples</H2 | |
168 ><P | |
169 ><PRE | |
170 CLASS="PROGRAMLISTING" | |
171 >int delta_x, delta_y; | |
172 SDL_Joystick *joy; | |
173 . | |
174 . | |
175 . | |
176 SDL_JoystickUpdate(); | |
177 if(SDL_JoystickGetBall(joy, 0, &delta_x, &delta_y)==-1) | |
178 printf("TrackBall Read Error!\n"); | |
179 printf("Trackball Delta- X:%d, Y:%d\n", delta_x, delta_y);</PRE | |
180 ></P | |
181 ></DIV | |
182 ><DIV | |
183 CLASS="REFSECT1" | |
184 ><A | |
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185 NAME="AEN6460" |
0 | 186 ></A |
187 ><H2 | |
188 >See Also</H2 | |
189 ><P | |
190 ><A | |
191 HREF="sdljoysticknumballs.html" | |
192 ><TT | |
193 CLASS="FUNCTION" | |
194 >SDL_JoystickNumBalls</TT | |
195 ></A | |
196 ></P | |
197 ></DIV | |
198 ><DIV | |
199 CLASS="NAVFOOTER" | |
200 ><HR | |
201 ALIGN="LEFT" | |
202 WIDTH="100%"><TABLE | |
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203 SUMMARY="Footer navigation table" |
0 | 204 WIDTH="100%" |
205 BORDER="0" | |
206 CELLPADDING="0" | |
207 CELLSPACING="0" | |
208 ><TR | |
209 ><TD | |
210 WIDTH="33%" | |
211 ALIGN="left" | |
212 VALIGN="top" | |
213 ><A | |
214 HREF="sdljoystickgetbutton.html" | |
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215 ACCESSKEY="P" |
0 | 216 >Prev</A |
217 ></TD | |
218 ><TD | |
219 WIDTH="34%" | |
220 ALIGN="center" | |
221 VALIGN="top" | |
222 ><A | |
223 HREF="index.html" | |
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224 ACCESSKEY="H" |
0 | 225 >Home</A |
226 ></TD | |
227 ><TD | |
228 WIDTH="33%" | |
229 ALIGN="right" | |
230 VALIGN="top" | |
231 ><A | |
232 HREF="sdljoystickclose.html" | |
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233 ACCESSKEY="N" |
0 | 234 >Next</A |
235 ></TD | |
236 ></TR | |
237 ><TR | |
238 ><TD | |
239 WIDTH="33%" | |
240 ALIGN="left" | |
241 VALIGN="top" | |
242 >SDL_JoystickGetButton</TD | |
243 ><TD | |
244 WIDTH="34%" | |
245 ALIGN="center" | |
246 VALIGN="top" | |
247 ><A | |
248 HREF="joystick.html" | |
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249 ACCESSKEY="U" |
0 | 250 >Up</A |
251 ></TD | |
252 ><TD | |
253 WIDTH="33%" | |
254 ALIGN="right" | |
255 VALIGN="top" | |
256 >SDL_JoystickClose</TD | |
257 ></TR | |
258 ></TABLE | |
259 ></DIV | |
260 ></BODY | |
261 ></HTML | |
262 > |