php man page for zbuffer

ZBUFFER(3alleg4)						  Allegro manual						  ZBUFFER(3alleg4)

NAME
       ZBUFFER - Stores 3d zbuffer information. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       typedef struct BITMAP ZBUFFER

DESCRIPTION
       Structure  used	by Allegro's 3d zbuffered rendering functions. You are not supposed to mix ZBUFFER with BITMAP even though it is currently
       possible to do so. This is just an internal representation, and it may change in the future.

SEE ALSO
       BITMAP(3alleg4), exzbuf(3alleg4)

Allegro 							   version 4.4.2						  ZBUFFER(3alleg4)