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><H1 |
><A |
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>SDL_GL_SetAttribute</A |
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><A |
NAME="AEN2323" |
></A |
><H2 |
>Name</H2 |
>SDL_GL_SetAttribute -- Set a special SDL/OpenGL attribute</DIV |
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><H2 |
>Synopsis</H2 |
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><P |
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><PRE |
CLASS="FUNCSYNOPSISINFO" |
>#include "SDL.h"</PRE |
><P |
><CODE |
><CODE |
CLASS="FUNCDEF" |
>int <B |
CLASS="FSFUNC" |
>SDL_GL_SetAttribute</B |
></CODE |
>(SDL_GLattr attr, int value);</CODE |
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CLASS="REFSECT1" |
><A |
NAME="AEN2333" |
></A |
><H2 |
>Description</H2 |
><P |
>Sets the OpenGL <A |
HREF="sdlglattr.html" |
>attribute</A |
> <TT |
CLASS="PARAMETER" |
><I |
>attr</I |
></TT |
> to <TT |
CLASS="PARAMETER" |
><I |
>value</I |
></TT |
>. The attributes you set don't take effect until after a call to <A |
HREF="sdlsetvideomode.html" |
><TT |
CLASS="FUNCTION" |
>SDL_SetVideoMode</TT |
></A |
>. You should use <A |
HREF="sdlglgetattribute.html" |
><TT |
CLASS="FUNCTION" |
>SDL_GL_GetAttribute</TT |
></A |
> to check the values after a <TT |
CLASS="FUNCTION" |
>SDL_SetVideoMode</TT |
> call.</P |
></DIV |
><DIV |
CLASS="REFSECT1" |
><A |
NAME="AEN2344" |
></A |
><H2 |
>Return Value</H2 |
><P |
>Returns <SPAN |
CLASS="RETURNVALUE" |
>0</SPAN |
> on success, or <SPAN |
CLASS="RETURNVALUE" |
>-1</SPAN |
> on error.</P |
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><A |
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></A |
><H2 |
>Example</H2 |
><PRE |
CLASS="PROGRAMLISTING" |
>SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 ); |
SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 ); |
SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 ); |
SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 ); |
SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); |
if ( (screen=SDL_SetVideoMode( 640, 480, 16, SDL_OPENGL )) == NULL ) { |
fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError()); |
SDL_Quit(); |
return; |
}</PRE |
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><BLOCKQUOTE |
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><P |
><B |
>Note: </B |
>The <TT |
CLASS="LITERAL" |
>SDL_DOUBLEBUF</TT |
> 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 |
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><H2 |
>See Also</H2 |
><P |
><A |
HREF="sdlglgetattribute.html" |
><TT |
CLASS="FUNCTION" |
>SDL_GL_GetAttribute</TT |
></A |
>, |
<A |
HREF="sdlglattr.html" |
>GL Attributes</A |
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