/** @private */
virtual public void Reset(b2Fixture fixtureA = null, b2Fixture fixtureB = null)
{
m_flags = e_enabledFlag;
if (fixtureA == null || fixtureB == null)
{
m_fixtureA = null;
m_fixtureB = null;
return;
}
if (fixtureA.IsSensor() || fixtureB.IsSensor())
{
m_flags |= e_sensorFlag;
}
b2Body bodyA = fixtureA.GetBody();
b2Body bodyB = fixtureB.GetBody();
if (bodyA.GetType() != b2Body.b2_dynamicBody || bodyA.IsBullet() || bodyB.GetType() != b2Body.b2_dynamicBody || bodyB.IsBullet())
{
m_flags |= e_continuousFlag;
}
m_fixtureA = fixtureA;
m_fixtureB = fixtureB;
m_manifold.m_pointCount = 0;
m_prev = null;
m_next = null;
m_nodeA.contact = null;
m_nodeA.prev = null;
m_nodeA.next = null;
m_nodeA.other = null;
m_nodeB.contact = null;
m_nodeB.prev = null;
m_nodeB.next = null;
m_nodeB.other = null;
}
internal static void Destroy(ref b2Contact contact)
{
Debug.Assert(s_initialized == true);
b2Fixture fixtureA = contact.m_fixtureA;
b2Fixture fixtureB = contact.m_fixtureB;
if (contact.m_manifold.pointCount > 0 && fixtureA.IsSensor() == false && fixtureB.IsSensor() == false)
{
fixtureA.GetBody().SetAwake(true);
fixtureB.GetBody().SetAwake(true);
}
b2Shape.Type typeA = fixtureA.GetType();
b2Shape.Type typeB = fixtureB.GetType();
Debug.Assert(0 <= ((int)typeA) && typeB < b2Shape.Type.e_typeCount);
Debug.Assert(0 <= ((int)typeA) && typeB < b2Shape.Type.e_typeCount);
b2ContactDestroyFcn destroyFcn = s_registers[(int)typeA, (int)typeB].destroyFcn;
destroyFcn(ref contact);
}
// Broad-phase callback.
public void AddPair(object proxyUserDataA, object proxyUserDataB)
{
b2FixtureProxy proxyA = (b2FixtureProxy)proxyUserDataA;
b2FixtureProxy proxyB = (b2FixtureProxy)proxyUserDataB;
b2Fixture fixtureA = proxyA.fixture;
b2Fixture fixtureB = proxyB.fixture;
int indexA = proxyA.childIndex;
int indexB = proxyB.childIndex;
b2Body bodyA = fixtureA.GetBody();
b2Body bodyB = fixtureB.GetBody();
// Are the fixtures on the same body?
if (bodyA == bodyB)
{
return;
}
// TODO_ERIN use a hash table to remove a potential bottleneck when both
// bodies have a lot of contacts.
// Does a contact already exist?
b2ContactEdge edge = bodyB.GetContactList();
while (edge != null)
{
if (edge.other == bodyA)
{
b2Fixture fA = edge.contact.GetFixtureA();
b2Fixture fB = edge.contact.GetFixtureB();
int iA = edge.contact.GetChildIndexA();
int iB = edge.contact.GetChildIndexB();
if (fA == fixtureA && fB == fixtureB && iA == indexA && iB == indexB)
{
// A contact already exists.
return;
}
if (fA == fixtureB && fB == fixtureA && iA == indexB && iB == indexA)
{
// A contact already exists.
return;
}
}
edge = edge.next;
}
// Does a joint override collision? Is at least one body dynamic?
if (bodyB.ShouldCollide(bodyA) == false)
{
return;
}
// Check user filtering.
if (m_contactFilter != null && m_contactFilter.ShouldCollide(fixtureA, fixtureB) == false)
{
return;
}
// Call the factory.
b2Contact c = b2Contact.Create(fixtureA, indexA, fixtureB, indexB);
if (c == null)
{
return;
}
// Contact creation may swap fixtures.
fixtureA = c.GetFixtureA();
fixtureB = c.GetFixtureB();
indexA = c.GetChildIndexA();
indexB = c.GetChildIndexB();
bodyA = fixtureA.GetBody();
bodyB = fixtureB.GetBody();
// Insert into the world.
c.m_prev = null;
c.m_next = m_contactList;
if (m_contactList != null)
{
m_contactList.m_prev = c;
}
m_contactList = c;
// Connect to island graph.
// Connect to body A
c.m_nodeA.contact = c;
c.m_nodeA.other = bodyB;
c.m_nodeA.prev = null;
c.m_nodeA.next = bodyA.m_contactList;
if (bodyA.m_contactList != null)
{
bodyA.m_contactList.prev = c.m_nodeA;
}
bodyA.m_contactList = c.m_nodeA;
// Connect to body B
c.m_nodeB.contact = c;
c.m_nodeB.other = bodyA;
c.m_nodeB.prev = null;
c.m_nodeB.next = bodyB.m_contactList;
if (bodyB.m_contactList != null)
{
bodyB.m_contactList.prev = c.m_nodeB;
}
bodyB.m_contactList = c.m_nodeB;
// Wake up the bodies
if (fixtureA.IsSensor() == false && fixtureB.IsSensor() == false)
{
bodyA.SetAwake(true);
bodyB.SetAwake(true);
}
++m_contactCount;
}
