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use super::Vec3;

#[inline]
pub fn vec3(x: f32, y: f32, z: f32) -> Vec3 {
    Vec3::new(x, y, z)
}

impl Vec3 {
    /// Returns a new `Vec4` with elements representing the sign of `self`.
    ///
    /// - `1.0` if the number is positive, `+0.0` or `INFINITY`
    /// - `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`
    #[inline]
    pub fn sign(self) -> Self {
        let mask = self.cmpge(Self::zero());
        mask.select(Self::splat(1.0), Self::splat(-1.0))
    }

    /// Computes the reciprocal `1.0/n` of each element, returning the
    /// results in a new `Vec3`.
    #[inline]
    pub fn reciprocal(self) -> Self {
        // TODO: Optimize
        Self::one() / self
    }

    /// Performs a linear interpolation between `self` and `other` based on
    /// the value `s`.
    ///
    /// When `s` is `0.0`, the result will be equal to `self`.  When `s`
    /// is `1.0`, the result will be equal to `other`.
    #[inline]
    pub fn lerp(self, other: Self, s: f32) -> Self {
        glam_assert!(s >= 0.0 && s <= 1.0);
        self + ((other - self) * s)
    }

    /// Returns whether `self` of length `1.0` or not.
    ///
    /// Uses a precision threshold of `std::f32::EPSILON`.
    #[inline]
    pub fn is_normalized(self) -> bool {
        is_normalized!(self)
    }

    /// Returns true if the absolute difference of all elements between `self`
    /// and `other` is less than or equal to `max_abs_diff`.
    ///
    /// This can be used to compare if two `Vec3`'s contain similar elements. It
    /// works best when comparing with a known value. The `max_abs_diff` that
    /// should be used used depends on the values being compared against.
    ///
    /// For more on floating point comparisons see
    /// https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/
    #[inline]
    pub fn abs_diff_eq(self, other: Self, max_abs_diff: f32) -> bool {
        abs_diff_eq!(self, other, max_abs_diff)
    }
}

impl AsRef<[f32; 3]> for Vec3 {
    #[inline]
    fn as_ref(&self) -> &[f32; 3] {
        unsafe { &*(self as *const Vec3 as *const [f32; 3]) }
    }
}

impl AsMut<[f32; 3]> for Vec3 {
    #[inline]
    fn as_mut(&mut self) -> &mut [f32; 3] {
        unsafe { &mut *(self as *mut Vec3 as *mut [f32; 3]) }
    }
}