# Fullscreen modes

These functions are declared in the main Allegro header file:

~~~~c
 #include <allegro5/allegro.h>
~~~~

## API: ALLEGRO_DISPLAY_MODE

Used for fullscreen mode queries. Contains information
about a supported fullscreen modes.

~~~~c
typedef struct ALLEGRO_DISPLAY_MODE {
   int width;          // Screen width
   int height;         // Screen height
   int format;         // The pixel format of the mode
   int refresh_rate;   // The refresh rate of the mode
} ALLEGRO_DISPLAY_MODE;
~~~~

The `refresh_rate` may be zero if unknown.

See also: [al_get_display_mode]

## API: al_get_display_mode

Retrieves a fullscreen mode. Display parameters should not be
changed between a call of [al_get_num_display_modes] and
[al_get_display_mode]. index must be between 0 and the number
returned from al_get_num_display_modes-1. mode must be an
allocated ALLEGRO_DISPLAY_MODE structure. This function will
return NULL on failure, and the mode parameter that was passed
in on success.

See also: [ALLEGRO_DISPLAY_MODE], [al_get_num_display_modes]

## API: al_get_num_display_modes

Get the number of available fullscreen display modes
for the current set of display parameters. This will
use the values set with [al_set_new_display_refresh_rate],
and [al_set_new_display_flags] to find the number of modes
that match. Settings the new display parameters to zero will
give a list of all modes for the default driver.

See also: [al_get_display_mode]
