• SDL_GL_SetAttribute

SDL_GL_SetAttribute

SDL_GL_SetAttribute -- Sets a special SDL/OpenGL attribute

Syntax

int SDL_GL_SetAttribute(SDL_GLattr attr, int value);

Description

This function sets the OpenGL attribute attr to value. The requested attributes will take effect after a call to SDL_SetVideoMode. You should use SDL_GL_GetAttribute to check the values after a SDL_SetVideoMode call, 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.

Parameters

attr [in]

• The SDL OpenGL attribute to set. See SDL_GLattr for the full list of available attributes

value [in]

• The new value of the attribute

Return value

-1

• On error

0

• On success

See also

SDL_GL_GetAttribute, SDL_GLattr

Example

   1 SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
   2 SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
   3 SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
   4 SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
   5 SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
   6 if ( (screen=SDL_SetVideoMode( 640, 480, 16, SDL_OPENGL )) == NULL ) {
   7     fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError());
   8     SDL_Quit();
   9     return;
  10 }

Requirements

CategorySDLVideo