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  73 NAME="SDLGLSETATTRIBUTE"
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  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&nbsp;--&nbsp;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"
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  94 NAME="AEN2746"
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  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
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