osx man page for virtual_h

VIRTUAL_W(3alleg4)						  Allegro manual						VIRTUAL_W(3alleg4)

NAME
       VIRTUAL_W, VIRTUAL_H - Global define to obtain the virtual size of the screen. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       #define VIRTUAL_W;

       #define VIRTUAL_H;

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

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

SEE ALSO
       screen(3alleg4), set_gfx_mode(3alleg4), SCREEN_W(3alleg4), SCREEN_H(3alleg4)

Allegro 							   version 4.4.2						VIRTUAL_W(3alleg4)