1 <HTML 2 ><HEAD 3 ><TITLE 4 >SDL_GL_SetAttribute</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_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 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="sdlglgetattribute.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="sdlglswapbuffers.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="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 221 ></DIV 222 ><DIV 223 CLASS="NAVFOOTER" 224 ><HR 225 ALIGN="LEFT" 226 WIDTH="100%"><TABLE 227 SUMMARY="Footer navigation table" 228 WIDTH="100%" 229 BORDER="0" 230 CELLPADDING="0" 231 CELLSPACING="0" 232 ><TR 233 ><TD 234 WIDTH="33%" 235 ALIGN="left" 236 VALIGN="top" 237 ><A 238 HREF="sdlglgetattribute.html" 239 ACCESSKEY="P" 240 >Prev</A 241 ></TD 242 ><TD 243 WIDTH="34%" 244 ALIGN="center" 245 VALIGN="top" 246 ><A 247 HREF="index.html" 248 ACCESSKEY="H" 249 >Home</A 250 ></TD 251 ><TD 252 WIDTH="33%" 253 ALIGN="right" 254 VALIGN="top" 255 ><A 256 HREF="sdlglswapbuffers.html" 257 ACCESSKEY="N" 258 >Next</A 259 ></TD 260 ></TR 261 ><TR 262 ><TD 263 WIDTH="33%" 264 ALIGN="left" 265 VALIGN="top" 266 >SDL_GL_GetAttribute</TD 267 ><TD 268 WIDTH="34%" 269 ALIGN="center" 270 VALIGN="top" 271 ><A 272 HREF="video.html" 273 ACCESSKEY="U" 274 >Up</A 275 ></TD 276 ><TD 277 WIDTH="33%" 278 ALIGN="right" 279 VALIGN="top" 280 >SDL_GL_SwapBuffers</TD 281 ></TR 282 ></TABLE 283 ></DIV 284 ></BODY 285 ></HTML 286 >
