debian man page for quat_mul

quat_mul(3alleg4)						  Allegro manual						 quat_mul(3alleg4)

NAME
       quat_mul - Multiplies two quaternions. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       void quat_mul(const QUAT *p, const QUAT *q, QUAT *out);

DESCRIPTION
       Multiplies  two	quaternions,  storing the result in out. The resulting quaternion will have the same effect as the combination of p and q,
       ie.  when applied to a point, (point * out) = ((point * p) * q). Any number of rotations can be concatenated in this way. Note that quater-
       nion multiplication is not commutative, ie. quat_mul(p, q) != quat_mul(q, p).

Allegro 							   version 4.4.2						 quat_mul(3alleg4)