use na::{self, Real, U3, U4, Matrix4};

use aliases::{Vec, Mat};

pub fn matrix_cross3<N: Real>(x: &Vec<N, U3>) -> Mat<N, U3, U3> {
    x.cross_matrix()
}

pub fn matrix_cross4<N: Real>(x: &Vec<N, U3>) -> Mat<N, U4, U4> {
    let m = x.cross_matrix();

    // FIXME: use a dedicated constructor from Matrix3 to Matrix4.
    Matrix4::new(
        m.m11, m.m12, m.m13, N::zero(),
        m.m21, m.m22, m.m23, N::zero(),
        m.m31, m.m32, m.m33, N::zero(),
        N::zero(), N::zero(), N::zero(), N::one(),
    )
}