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annotate docs/html/sdlglgetprocaddress.html @ 302:8a86bdf34f0f
Added Atari joystick support (thanks Patrice!)
author | Sam Lantinga <slouken@libsdl.org> |
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date | Thu, 07 Mar 2002 20:23:11 +0000 |
parents | e5bc29de3f0a |
children | 355632dca928 |
rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_GL_GetProcAddress</TITLE | |
5 ><META | |
6 NAME="GENERATOR" | |
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
0 | 8 "><LINK |
9 REL="HOME" | |
10 TITLE="SDL Library Documentation" | |
11 HREF="index.html"><LINK | |
12 REL="UP" | |
13 TITLE="Video" | |
14 HREF="video.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_GL_LoadLibrary" | |
17 HREF="sdlglloadlibrary.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_GL_GetAttribute" | |
20 HREF="sdlglgetattribute.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 | |
31 WIDTH="100%" | |
32 BORDER="0" | |
33 CELLPADDING="0" | |
34 CELLSPACING="0" | |
35 ><TR | |
36 ><TH | |
37 COLSPAN="3" | |
38 ALIGN="center" | |
39 >SDL Library Documentation</TH | |
40 ></TR | |
41 ><TR | |
42 ><TD | |
43 WIDTH="10%" | |
44 ALIGN="left" | |
45 VALIGN="bottom" | |
46 ><A | |
47 HREF="sdlglloadlibrary.html" | |
48 >Prev</A | |
49 ></TD | |
50 ><TD | |
51 WIDTH="80%" | |
52 ALIGN="center" | |
53 VALIGN="bottom" | |
54 ></TD | |
55 ><TD | |
56 WIDTH="10%" | |
57 ALIGN="right" | |
58 VALIGN="bottom" | |
59 ><A | |
60 HREF="sdlglgetattribute.html" | |
61 >Next</A | |
62 ></TD | |
63 ></TR | |
64 ></TABLE | |
65 ><HR | |
66 ALIGN="LEFT" | |
67 WIDTH="100%"></DIV | |
68 ><H1 | |
69 ><A | |
70 NAME="SDLGLGETPROCADDRESS" | |
71 >SDL_GL_GetProcAddress</A | |
72 ></H1 | |
73 ><DIV | |
74 CLASS="REFNAMEDIV" | |
75 ><A | |
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76 NAME="AEN2294" |
0 | 77 ></A |
78 ><H2 | |
79 >Name</H2 | |
80 >SDL_GL_GetProcAddress -- Get the address of a GL function</DIV | |
81 ><DIV | |
82 CLASS="REFSYNOPSISDIV" | |
83 ><A | |
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84 NAME="AEN2297" |
0 | 85 ></A |
86 ><H2 | |
87 >Synopsis</H2 | |
88 ><DIV | |
89 CLASS="FUNCSYNOPSIS" | |
90 ><A | |
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91 NAME="AEN2298" |
0 | 92 ></A |
93 ><P | |
94 ></P | |
95 ><PRE | |
96 CLASS="FUNCSYNOPSISINFO" | |
97 >#include "SDL.h"</PRE | |
98 ><P | |
99 ><CODE | |
100 ><CODE | |
101 CLASS="FUNCDEF" | |
102 >void *<B | |
103 CLASS="FSFUNC" | |
104 >SDL_GL_GetProcAddress</B | |
105 ></CODE | |
106 >(const char* proc);</CODE | |
107 ></P | |
108 ><P | |
109 ></P | |
110 ></DIV | |
111 ></DIV | |
112 ><DIV | |
113 CLASS="REFSECT1" | |
114 ><A | |
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115 NAME="AEN2304" |
0 | 116 ></A |
117 ><H2 | |
118 >Description</H2 | |
119 ><P | |
120 >Returns the address of the GL function <TT | |
121 CLASS="PARAMETER" | |
122 ><I | |
123 >proc</I | |
124 ></TT | |
125 >, or <SPAN | |
126 CLASS="RETURNVALUE" | |
127 >NULL</SPAN | |
128 > if the function is not found. If the GL library is loaded at runtime, with <A | |
129 HREF="sdlglloadlibrary.html" | |
130 ><TT | |
131 CLASS="FUNCTION" | |
132 >SDL_GL_LoadLibrary</TT | |
133 ></A | |
134 >, then <I | |
135 CLASS="EMPHASIS" | |
136 >all</I | |
137 > GL functions must be retrieved this way. Usually this is used to retrieve function pointers to OpenGL extensions.</P | |
138 ></DIV | |
139 ><DIV | |
140 CLASS="REFSECT1" | |
141 ><A | |
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142 NAME="AEN2312" |
0 | 143 ></A |
144 ><H2 | |
145 >Example</H2 | |
146 ><PRE | |
147 CLASS="PROGRAMLISTING" | |
148 >typedef void (*GL_ActiveTextureARB_Func)(unsigned int); | |
149 GL_ActiveTextureARB_Func glActiveTextureARB_ptr = 0; | |
150 int has_multitexture=1; | |
151 . | |
152 . | |
153 . | |
154 /* Get function pointer */ | |
155 glActiveTextureARB_ptr=(GL_ActiveTextureARB_Func) SDL_GL_GetProcAddress("glActiveTextureARB"); | |
156 | |
157 /* Check for a valid function ptr */ | |
158 if(!glActiveTextureARB_ptr){ | |
159 fprintf(stderr, "Multitexture Extensions not present.\n"); | |
160 has_multitexture=0; | |
161 } | |
162 . | |
163 . | |
164 . | |
165 . | |
166 if(has_multitexture){ | |
167 glActiveTextureARB_ptr(GL_TEXTURE0_ARB); | |
168 . | |
169 . | |
170 } | |
171 else{ | |
172 . | |
173 . | |
174 }</PRE | |
175 ></DIV | |
176 ><DIV | |
177 CLASS="REFSECT1" | |
178 ><A | |
181
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179 NAME="AEN2315" |
0 | 180 ></A |
181 ><H2 | |
182 >See Also</H2 | |
183 ><P | |
184 ><A | |
185 HREF="sdlglloadlibrary.html" | |
186 ><TT | |
187 CLASS="FUNCTION" | |
188 >SDL_GL_LoadLibrary</TT | |
189 ></A | |
190 ></P | |
191 ></DIV | |
192 ><DIV | |
193 CLASS="NAVFOOTER" | |
194 ><HR | |
195 ALIGN="LEFT" | |
196 WIDTH="100%"><TABLE | |
197 WIDTH="100%" | |
198 BORDER="0" | |
199 CELLPADDING="0" | |
200 CELLSPACING="0" | |
201 ><TR | |
202 ><TD | |
203 WIDTH="33%" | |
204 ALIGN="left" | |
205 VALIGN="top" | |
206 ><A | |
207 HREF="sdlglloadlibrary.html" | |
208 >Prev</A | |
209 ></TD | |
210 ><TD | |
211 WIDTH="34%" | |
212 ALIGN="center" | |
213 VALIGN="top" | |
214 ><A | |
215 HREF="index.html" | |
216 >Home</A | |
217 ></TD | |
218 ><TD | |
219 WIDTH="33%" | |
220 ALIGN="right" | |
221 VALIGN="top" | |
222 ><A | |
223 HREF="sdlglgetattribute.html" | |
224 >Next</A | |
225 ></TD | |
226 ></TR | |
227 ><TR | |
228 ><TD | |
229 WIDTH="33%" | |
230 ALIGN="left" | |
231 VALIGN="top" | |
232 >SDL_GL_LoadLibrary</TD | |
233 ><TD | |
234 WIDTH="34%" | |
235 ALIGN="center" | |
236 VALIGN="top" | |
237 ><A | |
238 HREF="video.html" | |
239 >Up</A | |
240 ></TD | |
241 ><TD | |
242 WIDTH="33%" | |
243 ALIGN="right" | |
244 VALIGN="top" | |
245 >SDL_GL_GetAttribute</TD | |
246 ></TR | |
247 ></TABLE | |
248 ></DIV | |
249 ></BODY | |
250 ></HTML | |
251 > |