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use number_traits::Num;

#[inline]
pub fn set<'a, T: Copy + Num>(
    out: &'a mut [T; 9],
    m11: T,
    m12: T,
    m13: T,
    m21: T,
    m22: T,
    m23: T,
    m31: T,
    m32: T,
    m33: T,
) -> &'a mut [T; 9] {
    out[0] = m11;
    out[1] = m21;
    out[2] = m31;
    out[3] = m12;
    out[4] = m22;
    out[5] = m32;
    out[6] = m13;
    out[7] = m23;
    out[8] = m33;
    out
}

#[inline]
pub fn zero<'a, T: Copy + Num>(out: &'a mut [T; 9]) -> &'a mut [T; 9] {
    set(
        out,
        T::zero(),
        T::zero(),
        T::zero(),
        T::zero(),
        T::zero(),
        T::zero(),
        T::zero(),
        T::zero(),
        T::zero(),
    )
}
#[inline]
pub fn identity<'a, T: Copy + Num>(out: &'a mut [T; 9]) -> &'a mut [T; 9] {
    set(
        out,
        T::one(),
        T::zero(),
        T::zero(),
        T::zero(),
        T::one(),
        T::zero(),
        T::zero(),
        T::zero(),
        T::one(),
    )
}

#[inline]
pub fn from_mat2<'a, T: Copy + Num>(out: &'a mut [T; 9], m: &[T; 4]) -> &'a mut [T; 9] {
    set(
        out,
        m[0],
        m[2],
        T::zero(),
        m[1],
        m[3],
        T::zero(),
        T::zero(),
        T::zero(),
        T::one(),
    )
}
#[inline]
pub fn from_mat32<'a, T: Copy + Num>(out: &'a mut [T; 9], m: &[T; 6]) -> &'a mut [T; 9] {
    set(
        out,
        m[0],
        m[2],
        T::zero(),
        m[1],
        m[3],
        T::zero(),
        T::zero(),
        T::zero(),
        T::one(),
    )
}
#[inline]
pub fn from_mat3<'a, T: Copy + Num>(out: &'a mut [T; 9], m: &[T; 16]) -> &'a mut [T; 9] {
    set(out, m[0], m[4], m[8], m[1], m[5], m[9], m[2], m[6], m[10])
}