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clear_zbuffer(3)                Allegro manual                clear_zbuffer(3)

NAME
       clear_zbuffer - Writes a depth value into the given Z-buffer. Allegro
       game programming library.

SYNOPSIS
       #include <allegro.h>

       void clear_zbuffer(ZBUFFER *zbuf, float z);

DESCRIPTION
       Writes z into the given Z-buffer (0 means far away). This function
       should be used to initialize the Z-buffer before each frame. Actually,
       low-level routines compare depth of the current pixel with 1/z: for
       example, if you want to clip polygons farther than 10, you must call
       clear_zbuffer(zbuf, 0.1).

SEE ALSO
       create_zbuffer(3), set_zbuffer(3), destroy_zbuffer(3), exzbuf(3)

Allegro                          version 4.4.2                clear_zbuffer(3)