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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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children 55f1f1b3e27d
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1 <HTML
2 ><HEAD
3 ><TITLE
4 >SDL_GL_SetAttribute</TITLE
5 ><META
6 NAME="GENERATOR"
7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
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_GetAttribute"
17 HREF="sdlglgetattribute.html"><LINK
18 REL="NEXT"
19 TITLE="SDL_GL_SwapBuffers"
20 HREF="sdlglswapbuffers.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="sdlglgetattribute.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="sdlglswapbuffers.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="SDLGLSETATTRIBUTE"
71 >SDL_GL_SetAttribute</A
72 ></H1
73 ><DIV
74 CLASS="REFNAMEDIV"
75 ><A
76 NAME="AEN2244"
77 ></A
78 ><H2
79 >Name</H2
80 >SDL_GL_SetAttribute&nbsp;--&nbsp;Set a special SDL/OpenGL attribute</DIV
81 ><DIV
82 CLASS="REFSYNOPSISDIV"
83 ><A
84 NAME="AEN2247"
85 ></A
86 ><H2
87 >Synopsis</H2
88 ><DIV
89 CLASS="FUNCSYNOPSIS"
90 ><A
91 NAME="AEN2248"
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 >int <B
103 CLASS="FSFUNC"
104 >SDL_GL_SetAttribute</B
105 ></CODE
106 >(SDL_GLattr attr, int value);</CODE
107 ></P
108 ><P
109 ></P
110 ></DIV
111 ></DIV
112 ><DIV
113 CLASS="REFSECT1"
114 ><A
115 NAME="AEN2254"
116 ></A
117 ><H2
118 >Description</H2
119 ><P
120 >Sets the OpenGL <A
121 HREF="sdlglattr.html"
122 >attribute</A
123 > <TT
124 CLASS="PARAMETER"
125 ><I
126 >attr</I
127 ></TT
128 > to <TT
129 CLASS="PARAMETER"
130 ><I
131 >value</I
132 ></TT
133 >. The attributes you set don't take effect until after a call to <A
134 HREF="sdlsetvideomode.html"
135 ><TT
136 CLASS="FUNCTION"
137 >SDL_SetVideoMode</TT
138 ></A
139 >. You should use <A
140 HREF="sdlglgetattribute.html"
141 ><TT
142 CLASS="FUNCTION"
143 >SDL_GL_GetAttribute</TT
144 ></A
145 > to check the values after a <TT
146 CLASS="FUNCTION"
147 >SDL_SetVideoMode</TT
148 > call.</P
149 ></DIV
150 ><DIV
151 CLASS="REFSECT1"
152 ><A
153 NAME="AEN2265"
154 ></A
155 ><H2
156 >Return Value</H2
157 ><P
158 >Returns <SPAN
159 CLASS="RETURNVALUE"
160 >0</SPAN
161 > on success, or <SPAN
162 CLASS="RETURNVALUE"
163 >-1</SPAN
164 > on error.</P
165 ></DIV
166 ><DIV
167 CLASS="REFSECT1"
168 ><A
169 NAME="AEN2270"
170 ></A
171 ><H2
172 >Example</H2
173 ><PRE
174 CLASS="PROGRAMLISTING"
175 >SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
176 SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
177 SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
178 SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
179 SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
180 if ( (screen=SDL_SetVideoMode( 640, 480, 16, SDL_OPENGL )) == NULL ) {
181 fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError());
182 SDL_Quit();
183 return;
184 }</PRE
185 ><DIV
186 CLASS="NOTE"
187 ><BLOCKQUOTE
188 CLASS="NOTE"
189 ><P
190 ><B
191 >Note: </B
192 >The <TT
193 CLASS="LITERAL"
194 >SDL_DOUBLEBUF</TT
195 > flag is not required to enable double buffering when setting an OpenGL video mode. Double buffering is enabled or disabled using the SDL_GL_DOUBLEBUFFER attribute.</P
196 ></BLOCKQUOTE
197 ></DIV
198 ></DIV
199 ><DIV
200 CLASS="REFSECT1"
201 ><A
202 NAME="AEN2276"
203 ></A
204 ><H2
205 >See Also</H2
206 ><P
207 ><A
208 HREF="sdlglgetattribute.html"
209 ><TT
210 CLASS="FUNCTION"
211 >SDL_GL_GetAttribute</TT
212 ></A
213 >,
214 <A
215 HREF="sdlglattr.html"
216 >GL Attributes</A
217 ></P
218 ></DIV
219 ><DIV
220 CLASS="NAVFOOTER"
221 ><HR
222 ALIGN="LEFT"
223 WIDTH="100%"><TABLE
224 WIDTH="100%"
225 BORDER="0"
226 CELLPADDING="0"
227 CELLSPACING="0"
228 ><TR
229 ><TD
230 WIDTH="33%"
231 ALIGN="left"
232 VALIGN="top"
233 ><A
234 HREF="sdlglgetattribute.html"
235 >Prev</A
236 ></TD
237 ><TD
238 WIDTH="34%"
239 ALIGN="center"
240 VALIGN="top"
241 ><A
242 HREF="index.html"
243 >Home</A
244 ></TD
245 ><TD
246 WIDTH="33%"
247 ALIGN="right"
248 VALIGN="top"
249 ><A
250 HREF="sdlglswapbuffers.html"
251 >Next</A
252 ></TD
253 ></TR
254 ><TR
255 ><TD
256 WIDTH="33%"
257 ALIGN="left"
258 VALIGN="top"
259 >SDL_GL_GetAttribute</TD
260 ><TD
261 WIDTH="34%"
262 ALIGN="center"
263 VALIGN="top"
264 ><A
265 HREF="video.html"
266 >Up</A
267 ></TD
268 ><TD
269 WIDTH="33%"
270 ALIGN="right"
271 VALIGN="top"
272 >SDL_GL_SwapBuffers</TD
273 ></TR
274 ></TABLE
275 ></DIV
276 ></BODY
277 ></HTML
278 >