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annotate docs/html/guidetimeexamples.html @ 937:1e6366bde299
Date: Tue, 27 Jul 2004 17:14:00 +0200
From: "Eckhard Stolberg"
Subject: Controller names in SDL for Windows
I'm working on an Atari 2600 emulator for different systems that uses
the SDL. Some time ago someone created an adaptor that lets you use
your old Atari controllers with your computer through the USB port.
Some of the Atari controllers require special handling by the emulator,
so it would be nice, if it would be possible to detect if any of the
controllers connected to the computer is this adaptor.
SDL would allow that with the SDL_JoystickName function, but unfortunately
it doesn't work properly on Windows. On Linux and MacOSX this function
returns the name of the controller, but on Windows you'll only get the
name of the joystick driver. Most joysticks nowadays use the generic
Microsoft driver, so they all return the same name.
In an old MSDN article
(http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dnarinput/html/msdn_extdirect.asp)
Microsoft describes how to read out the OEM controller names from the registry.
I have implemented this for the SDL controller handler on Windows,
and now reading the joystick name works properly there too.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 21 Aug 2004 03:45:58 +0000 |
parents | 355632dca928 |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >Time 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="CDROM Examples" | |
17 HREF="guidecdromexamples.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL Reference" | |
20 HREF="reference.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="guidecdromexamples.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="reference.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="GUIDETIMEEXAMPLES" | |
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77 ></A |
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78 >Time 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="AEN412" |
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87 ></A |
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88 >Time based game loop</H2 |
0 | 89 ><P |
90 ><PRE | |
91 CLASS="PROGRAMLISTING" | |
92 >#define TICK_INTERVAL 30 | |
93 | |
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94 static Uint32 next_time; |
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95 |
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96 Uint32 time_left(void) |
0 | 97 { |
98 Uint32 now; | |
99 | |
100 now = SDL_GetTicks(); | |
181
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101 if(next_time <= now) |
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102 return 0; |
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103 else |
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104 return next_time - now; |
0 | 105 } |
106 | |
107 | |
181
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108 /* main game loop */ |
0 | 109 |
181
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110 next_time = SDL_GetTicks() + TICK_INTERVAL; |
0 | 111 while ( game_running ) { |
181
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112 update_game_state(); |
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113 SDL_Delay(time_left()); |
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114 next_time += TICK_INTERVAL; |
0 | 115 } </PRE |
116 ></P | |
117 ></DIV | |
118 ></DIV | |
119 ><DIV | |
120 CLASS="NAVFOOTER" | |
121 ><HR | |
122 ALIGN="LEFT" | |
123 WIDTH="100%"><TABLE | |
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124 SUMMARY="Footer navigation table" |
0 | 125 WIDTH="100%" |
126 BORDER="0" | |
127 CELLPADDING="0" | |
128 CELLSPACING="0" | |
129 ><TR | |
130 ><TD | |
131 WIDTH="33%" | |
132 ALIGN="left" | |
133 VALIGN="top" | |
134 ><A | |
135 HREF="guidecdromexamples.html" | |
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136 ACCESSKEY="P" |
0 | 137 >Prev</A |
138 ></TD | |
139 ><TD | |
140 WIDTH="34%" | |
141 ALIGN="center" | |
142 VALIGN="top" | |
143 ><A | |
144 HREF="index.html" | |
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145 ACCESSKEY="H" |
0 | 146 >Home</A |
147 ></TD | |
148 ><TD | |
149 WIDTH="33%" | |
150 ALIGN="right" | |
151 VALIGN="top" | |
152 ><A | |
153 HREF="reference.html" | |
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154 ACCESSKEY="N" |
0 | 155 >Next</A |
156 ></TD | |
157 ></TR | |
158 ><TR | |
159 ><TD | |
160 WIDTH="33%" | |
161 ALIGN="left" | |
162 VALIGN="top" | |
163 >CDROM Examples</TD | |
164 ><TD | |
165 WIDTH="34%" | |
166 ALIGN="center" | |
167 VALIGN="top" | |
168 ><A | |
169 HREF="guideexamples.html" | |
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170 ACCESSKEY="U" |
0 | 171 >Up</A |
172 ></TD | |
173 ><TD | |
174 WIDTH="33%" | |
175 ALIGN="right" | |
176 VALIGN="top" | |
177 >SDL Reference</TD | |
178 ></TR | |
179 ></TABLE | |
180 ></DIV | |
181 ></BODY | |
182 ></HTML | |
183 > |