internal static Contact Create(Fixture fixtureA, int indexA, Fixture fixtureB, int indexB)
{
ShapeType type1 = fixtureA.Shape.ShapeType;
ShapeType type2 = fixtureB.Shape.ShapeType;
//Debug.Assert(ShapeType.Unknown < type1 && type1 < ShapeType.TypeCount);
//Debug.Assert(ShapeType.Unknown < type2 && type2 < ShapeType.TypeCount);
Contact c = null;
Queue <Contact> pool = fixtureA.Body._world._contactPool;
if (pool.Count > 0)
{
lock (fixtureA.Body._world._contactPool) c = pool.Dequeue() ?? c;
if (c != null)
{
if ((type1 >= type2 || (type1 == ShapeType.Edge && type2 == ShapeType.Polygon)) && !(type2 == ShapeType.Edge && type1 == ShapeType.Polygon))
{
c.Reset(fixtureA, indexA, fixtureB, indexB);
}
else
{
c.Reset(fixtureB, indexB, fixtureA, indexA);
}
}
}
else
{
// Edge+Polygon is non-symetrical due to the way Erin handles collision type registration.
if ((type1 >= type2 || (type1 == ShapeType.Edge && type2 == ShapeType.Polygon)) && !(type2 == ShapeType.Edge && type1 == ShapeType.Polygon))
{
c = new Contact(fixtureA, indexA, fixtureB, indexB);
}
else
{
c = new Contact(fixtureB, indexB, fixtureA, indexA);
}
}
c._type = _registers[(int)type1, (int)type2];
return(c);
}
