|
1 <HTML |
|
2 ><HEAD |
|
3 ><TITLE |
|
4 >SDL_GL_GetProcAddress</TITLE |
|
5 ><META |
|
6 NAME="GENERATOR" |
|
7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
|
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 SUMMARY="Header navigation table" |
|
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="sdlglloadlibrary.html" |
|
49 ACCESSKEY="P" |
|
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="sdlglgetattribute.html" |
|
63 ACCESSKEY="N" |
|
64 >Next</A |
|
65 ></TD |
|
66 ></TR |
|
67 ></TABLE |
|
68 ><HR |
|
69 ALIGN="LEFT" |
|
70 WIDTH="100%"></DIV |
|
71 ><H1 |
|
72 ><A |
|
73 NAME="SDLGLGETPROCADDRESS" |
|
74 ></A |
|
75 >SDL_GL_GetProcAddress</H1 |
|
76 ><DIV |
|
77 CLASS="REFNAMEDIV" |
|
78 ><A |
|
79 NAME="AEN2678" |
|
80 ></A |
|
81 ><H2 |
|
82 >Name</H2 |
|
83 >SDL_GL_GetProcAddress -- Get the address of a GL function</DIV |
|
84 ><DIV |
|
85 CLASS="REFSYNOPSISDIV" |
|
86 ><A |
|
87 NAME="AEN2681" |
|
88 ></A |
|
89 ><H2 |
|
90 >Synopsis</H2 |
|
91 ><DIV |
|
92 CLASS="FUNCSYNOPSIS" |
|
93 ><A |
|
94 NAME="AEN2682" |
|
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 >void *<B |
|
106 CLASS="FSFUNC" |
|
107 >SDL_GL_GetProcAddress</B |
|
108 ></CODE |
|
109 >(const char* proc);</CODE |
|
110 ></P |
|
111 ><P |
|
112 ></P |
|
113 ></DIV |
|
114 ></DIV |
|
115 ><DIV |
|
116 CLASS="REFSECT1" |
|
117 ><A |
|
118 NAME="AEN2688" |
|
119 ></A |
|
120 ><H2 |
|
121 >Description</H2 |
|
122 ><P |
|
123 >Returns the address of the GL function <TT |
|
124 CLASS="PARAMETER" |
|
125 ><I |
|
126 >proc</I |
|
127 ></TT |
|
128 >, or <SPAN |
|
129 CLASS="RETURNVALUE" |
|
130 >NULL</SPAN |
|
131 > if the function is not found. If the GL library is loaded at runtime, with <A |
|
132 HREF="sdlglloadlibrary.html" |
|
133 ><TT |
|
134 CLASS="FUNCTION" |
|
135 >SDL_GL_LoadLibrary</TT |
|
136 ></A |
|
137 >, then <SPAN |
|
138 CLASS="emphasis" |
|
139 ><I |
|
140 CLASS="EMPHASIS" |
|
141 >all</I |
|
142 ></SPAN |
|
143 > GL functions must be retrieved this way. Usually this is used to retrieve function pointers to OpenGL extensions.</P |
|
144 ></DIV |
|
145 ><DIV |
|
146 CLASS="REFSECT1" |
|
147 ><A |
|
148 NAME="AEN2696" |
|
149 ></A |
|
150 ><H2 |
|
151 >Example</H2 |
|
152 ><PRE |
|
153 CLASS="PROGRAMLISTING" |
|
154 >typedef void (*GL_ActiveTextureARB_Func)(unsigned int); |
|
155 GL_ActiveTextureARB_Func glActiveTextureARB_ptr = 0; |
|
156 int has_multitexture=1; |
|
157 . |
|
158 . |
|
159 . |
|
160 /* Get function pointer */ |
|
161 glActiveTextureARB_ptr=(GL_ActiveTextureARB_Func) SDL_GL_GetProcAddress("glActiveTextureARB"); |
|
162 |
|
163 /* Check for a valid function ptr */ |
|
164 if(!glActiveTextureARB_ptr){ |
|
165 fprintf(stderr, "Multitexture Extensions not present.\n"); |
|
166 has_multitexture=0; |
|
167 } |
|
168 . |
|
169 . |
|
170 . |
|
171 . |
|
172 if(has_multitexture){ |
|
173 glActiveTextureARB_ptr(GL_TEXTURE0_ARB); |
|
174 . |
|
175 . |
|
176 } |
|
177 else{ |
|
178 . |
|
179 . |
|
180 }</PRE |
|
181 ></DIV |
|
182 ><DIV |
|
183 CLASS="REFSECT1" |
|
184 ><A |
|
185 NAME="AEN2699" |
|
186 ></A |
|
187 ><H2 |
|
188 >See Also</H2 |
|
189 ><P |
|
190 ><A |
|
191 HREF="sdlglloadlibrary.html" |
|
192 ><TT |
|
193 CLASS="FUNCTION" |
|
194 >SDL_GL_LoadLibrary</TT |
|
195 ></A |
|
196 ></P |
|
197 ></DIV |
|
198 ><DIV |
|
199 CLASS="NAVFOOTER" |
|
200 ><HR |
|
201 ALIGN="LEFT" |
|
202 WIDTH="100%"><TABLE |
|
203 SUMMARY="Footer navigation table" |
|
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="sdlglloadlibrary.html" |
|
215 ACCESSKEY="P" |
|
216 >Prev</A |
|
217 ></TD |
|
218 ><TD |
|
219 WIDTH="34%" |
|
220 ALIGN="center" |
|
221 VALIGN="top" |
|
222 ><A |
|
223 HREF="index.html" |
|
224 ACCESSKEY="H" |
|
225 >Home</A |
|
226 ></TD |
|
227 ><TD |
|
228 WIDTH="33%" |
|
229 ALIGN="right" |
|
230 VALIGN="top" |
|
231 ><A |
|
232 HREF="sdlglgetattribute.html" |
|
233 ACCESSKEY="N" |
|
234 >Next</A |
|
235 ></TD |
|
236 ></TR |
|
237 ><TR |
|
238 ><TD |
|
239 WIDTH="33%" |
|
240 ALIGN="left" |
|
241 VALIGN="top" |
|
242 >SDL_GL_LoadLibrary</TD |
|
243 ><TD |
|
244 WIDTH="34%" |
|
245 ALIGN="center" |
|
246 VALIGN="top" |
|
247 ><A |
|
248 HREF="video.html" |
|
249 ACCESSKEY="U" |
|
250 >Up</A |
|
251 ></TD |
|
252 ><TD |
|
253 WIDTH="33%" |
|
254 ALIGN="right" |
|
255 VALIGN="top" |
|
256 >SDL_GL_GetAttribute</TD |
|
257 ></TR |
|
258 ></TABLE |
|
259 ></DIV |
|
260 ></BODY |
|
261 ></HTML |
|
262 > |