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>SDL_GL_SetAttribute< /TITLE
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>SDL Library Documentation< /TH
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>< H1
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>SDL_GL_SetAttribute< /H1
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>< H2
>Name< /H2
>SDL_GL_SetAttribute -- Set a special SDL/OpenGL attribute< /DIV
>< DIV
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>< A
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>< /A
>< H2
>Synopsis< /H2
>< DIV
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>< A
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NAME="AEN2746"
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>< /A
>< P
>< /P
>< 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
>< /P
>< P
>< /P
>< /DIV
>< /DIV
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>< A
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NAME="AEN2752"
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>< /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
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>< A
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>< /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
>< DIV
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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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>< /A
>< 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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