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


       #include <allegro.h>

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


       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