Sortix cross-nightly manual

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SDL_GL_SetAttribute(3)

SDL API Reference

SDL_GL_SetAttribute(3)

NAME

SDL_GL_SetAttribute - Set a special SDL/OpenGL attribute

SYNOPSIS

#include "SDL.h"

int SDL_GL_SetAttribute(SDL_GLattr attr, int value);

DESCRIPTION

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.

RETURN VALUE

Returns 0 on success, or -1 on error.

EXAMPLE

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.