sdl_gl_setattribute(3) [centos man page]

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.

SEE ALSO

       SDL_GL_GetAttribute, GL Attributes

SDL
							      Tue 11 Sep 2001, 23:01					    SDL_GL_SetAttribute(3)

SDL_SetColors(3)						 SDL API Reference						  SDL_SetColors(3)

NAME

       SDL_SetColors - Sets a portion of the colormap for the given 8-bit surface.

SYNOPSIS

       #include "SDL.h"

       int SDL_SetColors(SDL_Surface *surface, SDL_Color *colors, int firstcolor, int ncolors);

DESCRIPTION

       Sets a portion of the colormap for the given 8-bit surface.

       When  surface  is  the  surface	associated  with  the  current display, the display colormap will be updated with the requested colors. If
       SDL_HWPALETTE was set in SDL_SetVideoMode flags, SDL_SetColors will always return 1, and the palette is guaranteed to be set  the  way  you
       desire, even if the window colormap has to be warped or run under emulation.

       The color components of a SDL_Color structure are 8-bits in size, giving you a total of 256^3 =16777216 colors.

       Palettized  (8-bit) screen surfaces with the SDL_HWPALETTE flag have two palettes, a logical palette that is used for mapping blits to/from
       the surface and a physical palette (that determines how the hardware will map the colors to the display). SDL_SetColors modifies both  pal-
       ettes (if present), and is equivalent to calling SDL_SetPalette with the flags set to (SDL_LOGPAL | SDL_PHYSPAL).

RETURN VALUE

       If  surface is not a palettized surface, this function does nothing, returning 0. If all of the colors were set as passed to SDL_SetColors,
       it will return 1. If not all the color entries were set exactly as given, it will return 0, and you should look at the surface  palette	to
       determine the actual color palette.

EXAMPLE

       /* Create a display surface with a grayscale palette */
       SDL_Surface *screen;
       SDL_Color colors[256];
       int i;
       .
       .
       .
       /* Fill colors with color information */
       for(i=0;i<256;i++){
	 colors[i].r=i;
	 colors[i].g=i;
	 colors[i].b=i;
       }

       /* Create display */
       screen=SDL_SetVideoMode(640, 480, 8, SDL_HWPALETTE);
       if(!screen){
	 printf("Couldn't set video mode: %s
       ", SDL_GetError());
	 exit(-1);
       }

       /* Set palette */
       SDL_SetColors(screen, colors, 0, 256);
       .
       .
       .
       .

SEE ALSO

       SDL_Color SDL_Surface, SDL_SetPalette, SDL_SetVideoMode

SDL
							      Tue 11 Sep 2001, 23:01						  SDL_SetColors(3)