get_gfx_mode_type (3alleg4)

#include <allegro.h>

int get_gfx_mode_type(int graphics_card);

This function lets you determine the types of operating modes that a specific graphics card driver operates in. It will tell you whether it is a windowed, fullscreen, definitely windowed or fullscreen, and/or a magic driver.

The value returned is a bitfield consisting of these fields:

GFX_TYPE_UNKNOWN GFX_TYPE_WINDOWED GFX_TYPE_FULLSCREEN GFX_TYPE_DEFINITE GFX_TYPE_MAGIC

The return value will only be equivalent to GFX_TYPE_UNKNOWN when it is a driver unrecognized on that platform, or it is a bogus value. Test for the other types by using a bitwise AND. If the driver is windowed or fullscreen, it will also have the definite flag set. For example,

   int gfx_type = get_gfx_mode_type(GFX_AUTODETECT_WINDOWED);

gfx_type would have the GFX_TYPE_WINDOWED, GFX_TYPE_DEFINITE, and GFX_TYPE_MAGIC flags set.

Allegro needs to be initialized first.

Example:

   /* Accept the use of only windowed drivers in our selection dialog */
   int accept_windowed(int card , int w , int h , int color_depth)
   {
      if (get_gfx_mode_type(card) & GFX_TYPE_WINDOWED)
         return 0;
      return 1;
   }

   /* In main: */
   gfx_mode_select_filter(&card, &w, &h, &color_depth, accept_windowed);

Returns a bitfield describing the graphics mode type.

gfx_mode_select_filter(3alleg4), get_gfx_mode(3alleg4), set_gfx_mode(3alleg4), is_windowed_mode(3alleg4)