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1 | <HTML |
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3 | ><TITLE |
4 | >SDL_GL_SetAttribute</TITLE |
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70 | WIDTH="100%"></DIV |
71 | ><H1 |
72 | ><A |
73 | NAME="SDLGLSETATTRIBUTE" |
74 | ></A |
75 | >SDL_GL_SetAttribute</H1 |
76 | ><DIV |
77 | CLASS="REFNAMEDIV" |
78 | ><A |
79 | NAME="AEN2742" |
80 | ></A |
81 | ><H2 |
82 | >Name</H2 |
83 | >SDL_GL_SetAttribute -- Set a special SDL/OpenGL attribute</DIV |
84 | ><DIV |
85 | CLASS="REFSYNOPSISDIV" |
86 | ><A |
87 | NAME="AEN2745" |
88 | ></A |
89 | ><H2 |
90 | >Synopsis</H2 |
91 | ><DIV |
92 | CLASS="FUNCSYNOPSIS" |
93 | ><A |
94 | NAME="AEN2746" |
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_GL_SetAttribute</B |
108 | ></CODE |
109 | >(SDL_GLattr attr, int value);</CODE |
110 | ></P |
111 | ><P |
112 | ></P |
113 | ></DIV |
114 | ></DIV |
115 | ><DIV |
116 | CLASS="REFSECT1" |
117 | ><A |
118 | NAME="AEN2752" |
119 | ></A |
120 | ><H2 |
121 | >Description</H2 |
122 | ><P |
123 | >Sets the OpenGL <A |
124 | HREF="sdlglattr.html" |
125 | >attribute</A |
126 | > <TT |
127 | CLASS="PARAMETER" |
128 | ><I |
129 | >attr</I |
130 | ></TT |
131 | > to <TT |
132 | CLASS="PARAMETER" |
133 | ><I |
134 | >value</I |
135 | ></TT |
136 | >. The attributes you set don't take effect until after a call to <A |
137 | HREF="sdlsetvideomode.html" |
138 | ><TT |
139 | CLASS="FUNCTION" |
140 | >SDL_SetVideoMode</TT |
141 | ></A |
142 | >. You should use <A |
143 | HREF="sdlglgetattribute.html" |
144 | ><TT |
145 | CLASS="FUNCTION" |
146 | >SDL_GL_GetAttribute</TT |
147 | ></A |
148 | > to check the values after a <TT |
149 | CLASS="FUNCTION" |
150 | >SDL_SetVideoMode</TT |
151 | > call.</P |
152 | ></DIV |
153 | ><DIV |
154 | CLASS="REFSECT1" |
155 | ><A |
156 | NAME="AEN2763" |
157 | ></A |
158 | ><H2 |
159 | >Return Value</H2 |
160 | ><P |
161 | >Returns <SPAN |
162 | CLASS="RETURNVALUE" |
163 | >0</SPAN |
164 | > on success, or <SPAN |
165 | CLASS="RETURNVALUE" |
166 | >-1</SPAN |
167 | > on error.</P |
168 | ></DIV |
169 | ><DIV |
170 | CLASS="REFSECT1" |
171 | ><A |
172 | NAME="AEN2768" |
173 | ></A |
174 | ><H2 |
175 | >Example</H2 |
176 | ><PRE |
177 | CLASS="PROGRAMLISTING" |
178 | >SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 ); |
179 | SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 ); |
180 | SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 ); |
181 | SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 ); |
182 | SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); |
183 | if ( (screen=SDL_SetVideoMode( 640, 480, 16, SDL_OPENGL )) == NULL ) { |
184 | fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError()); |
185 | SDL_Quit(); |
186 | return; |
187 | }</PRE |
188 | ><DIV |
189 | CLASS="NOTE" |
190 | ><BLOCKQUOTE |
191 | CLASS="NOTE" |
192 | ><P |
193 | ><B |
194 | >Note: </B |
195 | >The <TT |
196 | CLASS="LITERAL" |
197 | >SDL_DOUBLEBUF</TT |
198 | > 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 |
199 | ></BLOCKQUOTE |
200 | ></DIV |
201 | ></DIV |
202 | ><DIV |
203 | CLASS="REFSECT1" |
204 | ><A |
205 | NAME="AEN2774" |
206 | ></A |
207 | ><H2 |
208 | >See Also</H2 |
209 | ><P |
210 | ><A |
211 | HREF="sdlglgetattribute.html" |
212 | ><TT |
213 | CLASS="FUNCTION" |
214 | >SDL_GL_GetAttribute</TT |
215 | ></A |
216 | >, |
217 | <A |
218 | HREF="sdlglattr.html" |
219 | >GL Attributes</A |
220 | ></P |
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