debian man page for quat_slerp

quat_slerp(3alleg4)						  Allegro manual					       quat_slerp(3alleg4)

NAME
       quat_slerp - Version of quat_interpolate() allowing control over the rotation. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       void quat_slerp(const QUAT *from, const QUAT *to, float t, QUAT *out, int how);

DESCRIPTION
       The same as quat_interpolate(), but allows more control over how the rotation is done. The how parameter can be any one of the values:

	  QUAT_SHORT  - like quat_interpolate(), use shortest path
	  QUAT_LONG   - rotation will be greater than 180 degrees
	  QUAT_CW     - rotate clockwise when viewed from above
	  QUAT_CCW    - rotate counterclockwise when viewed from above
	  QUAT_USER   - the quaternions are interpolated exactly as
			given

Allegro 							   version 4.4.2					       quat_slerp(3alleg4)