Function box2d_rs::b2_collision::b2_get_point_states

pub fn b2_get_point_states(
    state1: &mut [B2pointState; 2], 
    state2: &mut [B2pointState; 2], 
    manifold1: &B2manifold, 
    manifold2: &B2manifold
)

Compute the point states given two manifolds. The states pertain to the transition from manifold1 to manifold2. So state1 is either persist or remove while state2 is either add or persist.