simplified collecting contacts by removing expiry and just clearing the list

src/physics_entity.c

@@ -90,14 +90,13 @@ void physics_entity_update(PhysicsEntity self) {
 
     ASSERT_RETURN(!visnanf(rigidbody_get_velocity(body)),, "Velocity is NaN (0)");
 
-    rigidbody_collect_contacts(body);
-
     List* contacts = rigidbody_get_contacts(body);
     if(contacts->len > 0) {
         self.tc->collision_solver(self.data, contacts);
         list_foreach(Contact, contact, contacts)
             self.tc->on_collision(self.data, contact->hit);
     }
+    rigidbody_collect_contacts(body);
 
     ASSERT_RETURN(!visnanf(rigidbody_get_velocity(body)),, "Velocity is NaN (1)");
 }

src/rigidbody.c

@@ -45,36 +45,15 @@ void rigidbody_destroy(RigidBody* self) {
 }
 
 void rigidbody_add_contact(RigidBody* self, Collision hit) {
-    // update an existing contact
-    list_foreach(Contact, contact, &self->contacts) {
-        if(contact->hit.other.data == hit.other.data) {
-            ++contact->expiry;
-            contact->hit = hit;
-            contact->duration += delta_time();
-            return;
-        }
-    }
-
-    // create a new contact
     list_add(&self->contacts,
     &(Contact) {
-        .expiry = 1,
         .hit = hit,
         .duration = delta_time()
     });
 }
 
 void rigidbody_collect_contacts(RigidBody* self) {
-    for(size_t i = 0; i < self->contacts.len; ++i) {
-        Contact* contact = list_at(&self->contacts, i);
-
-        if(contact->expiry <= 0) {
-            list_erase(&self->contacts, i);
-            i--;
-        } else {
-            --(contact->expiry);
-        }
-    }
+    list_empty(&self->contacts);
 }
 
 List* rigidbody_get_contacts(RigidBody* self) {