SCREEN_W, SCREEN_H

#include <allegro.h>

#define SCREEN_W;

#define SCREEN_H;

Global defines that return the width and height of the screen, or zero if the screen has not been initialised yet. Example:

   char buf[100];
   ...
   uszprintf(buf, sizeof(buf),
             "The screen size is %d x %d pixels",
             SCREEN_W, SCREEN_H);

screen(3alleg4), set_gfx_mode(3alleg4), VIRTUAL_W(3alleg4), VIRTUAL_H(3alleg4)