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       get_x_rotate_quat,   get_y_rotate_quat,   get_z_rotate_quat   -  Construct  axis  rotation
       quaternions. Allegro game programming library.


       #include <allegro.h>

       void get_x_rotate_quat(QUAT *q, float r);

       void get_y_rotate_quat(QUAT *q, float r);

       void get_z_rotate_quat(QUAT *q, float r);


       Construct axis rotation quaternions, storing them in q. When applied  to  a  point,  these
       quaternions  will  rotate  it  about  the  relevant  axis by the specified angle (given in
       binary, 256 degrees to a circle format).