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quat_slerp(3)                   Allegro manual                   quat_slerp(3)

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(3)