NAME

       al_fixasin - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              al_fixed al_fixasin(al_fixed x);

DESCRIPTION

       This  function  finds  the  inverse sine of a value using a lookup table.  The input value
       must be a fixed point value.  The inverse sine is defined only in the domain from -1 to 1.
       Outside  of  this  input  range,  the function will set Allegro's errno to EDOM and return
       zero.

       Example:

                  float angle;
                  al_fixed val;

                  /* Sets `val' to a right binary angle (64). */
                  val = al_fixasin(al_itofix(1));

                  /* Sets `angle' to 0.2405. */
                  angle = al_fixtof(al_fixmul(al_fixasin(al_ftofix(0.238)), al_fixtorad_r));

                  /* This will trigger the assert. */
                  val = al_fixasin(al_ftofix(-1.09));
                  assert(!al_get_errno());

RETURN VALUE

       Returns the inverse sine of a fixed point value, measured as  fixed  point  binary  format
       angle, or zero if the input was out of the range.  All return values of this function will
       be in the range -64 to 64.