Mercurial > sdl-ios-xcode
annotate docs/html/sdljoystickgetball.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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rev | line source |
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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 > |