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
The value returned is a bitfield consisting of these fields:
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.
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.
/* 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)
/* In main: */
gfx_mode_select_filter(&card, &w, &h, &color_depth, accept_windowed);