DRAFT |
SDL_GL_SetAttribute
Use this function to set an OpenGL window attribute before window creation.
Contents
Syntax
int SDL_GL_SetAttribute(SDL_GLattr attr,
int value)
Function Parameters
attr |
the SDL_GLattr to be set |
value |
the desired value for the attribute |
Return Value
Returns 0 on success or a negative error code * -1 * on failure; call SDL_GetError() for more information.
Code Examples
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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;
}
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Remarks
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This function sets the OpenGL attribute attr to value. The requested attributes will take effect after a call to SDL_SetVideoMode initializing the video driver. You should use SDL_GL_GetAttribute() to check the values after a call to SDL_SetVideoMode initializing the video driver, since the values obtained can differ from the requested ones.
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.
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