SDL_GL_SetAttribute - Set a special SDL/OpenGL attribute
#include "SDL.h"
int SDL_GL_SetAttribute(
SDL_GLattr attr, int value);
Sets the OpenGL
attribute attr to
value. The attributes you
set don't take effect until after a call to
SDL_SetVideoMode. You should use
SDL_GL_GetAttribute to check the values after a
SDL_SetVideoMode call.
Returns
0 on success, or
-1 on error.
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
", SDL_GetError());
SDL_Quit();
return;
}
Note:
The
SDL_DOUBLEBUF 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.
SDL_GL_GetAttribute,
GL Attributes