Function transform_mat4_projection 

pub fn transform_mat4_projection<'out, T>(
    out: &'out mut [T; 2],
    v: &[T; 2],
    m: &[T; 16],
) -> &'out mut [T; 2]
where
    T: Clone + One + Zero + Add<T, Output = T>,
    for<'a, 'b> &'a T: Div<&'b T, Output = T> + Mul<&'b T, Output = T>,

Example

let mut v = vec2::new_zero();
vec2::transform_mat4_projection(&mut v, &vec2::new_one(),
    &[1_f32, 0_f32, 0_f32, 0_f32, 0_f32, 1_f32, 0_f32, 0_f32, 0_f32, 0_f32, 1_f32, 0_f32, 0_f32, 0_f32, 0_f32, 1_f32]
);
assert_eq!(v, vec2::new_one());