create_zbuffer - Creates a Z-buffer for a bitmap. Allegro game programming library.

       Creates  a  Z-buffer  using  the size of the BITMAP you are planning to draw on. Several Z-buffers can be
       defined but only one can be used at the same time, so you must call set_zbuffer() to make  this  Z-buffer
       active.

       create_zbuffer - Creates a Z-buffer for a bitmap. Allegro game programming library.

       Returns  the  pointer  to the ZBUFFER or NULL if there was an error. Remember to destroy the ZBUFFER once
       you are done with it, to avoid having memory leaks.

create_sub_zbuffer(3alleg4),  set_zbuffer(3alleg4),   clear_zbuffer(3alleg4),   destroy_zbuffer(3alleg4),
       exzbuf(3alleg4)

Allegro                                           version 4.4.3                          create_zbuffer(3alleg4)

#include<allegro.h>ZBUFFER*create_zbuffer(BITMAP*bmp);