public static int AcosFast(int x)
{
// Return 0 for invalid values
if (x < -One || x > One)
{
FixedUtil.InvalidArgument("Fixed32.AcosFast", "x", x);
return(0);
}
// Compute Atan2(Sqrt((1+x) * (1-x)), x), using s32.32.
long xx = (long)(One + x) * (long)(One - x);
long y = Fixed64.SqrtFast(xx);
return((int)(Fixed64.Atan2Fast(y, (long)x << 16) >> 16));
}
public static F64 Atan2Fast(F64 y, F64 x)
{
return(FromRaw(Fixed64.Atan2Fast(y.Raw, x.Raw)));
}
