/// A colliding pair of shapes.
public cpArbiter(cpShape a, cpShape b)
{
this.handler = null;
this.swapped = false;
this.handlerA = null;
this.handlerB = null;
/// Calculated value to use for the elasticity coefficient.
/// Override in a pre-solve collision handler for custom behavior.
this.e = 0;
/// Calculated value to use for the friction coefficient.
/// Override in a pre-solve collision handler for custom behavior.
this.u = 0;
/// Calculated value to use for applying surface velocities.
/// Override in a pre-solve collision handler for custom behavior.
this.surface_vr = cpVect.Zero;
this.a = a; this.body_a = a.body;
this.b = b; this.body_b = b.body;
this.thread_a = new cpArbiterThread(null, null);
this.thread_b = new cpArbiterThread(null, null);
this.contacts = new List <cpContact>();
this.stamp = 0;
this.state = cpArbiterState.FirstCollision;
}
public void Update(cpCollisionInfo info, cpSpace space)
{
cpShape a = info.a, b = info.b;
// For collisions between two similar primitive types, the order could have been swapped since the last frame.
this.a = a; this.body_a = a.body;
this.b = b; this.body_b = b.body;
// Iterate over the possible pairs to look for hash value matches.
for (int i = 0; i < info.count; i++)
{
cpContact con = info.arr[i];
// r1 and r2 store absolute offsets at init time.
// Need to convert them to relative offsets.
con.r1 = cpVect.cpvsub(con.r1, a.body.p);
con.r2 = cpVect.cpvsub(con.r2, b.body.p);
// Cached impulses are not zeroed at init time.
con.jnAcc = con.jtAcc = 0.0f;
for (int j = 0; j < this.Count; j++)
{
cpContact old = this.contacts[j];
// This could trigger false positives, but is fairly unlikely nor serious if it does.
if (con.hash == old.hash)
{
// Copy the persistant contact information.
con.jnAcc = old.jnAcc;
con.jtAcc = old.jtAcc;
}
}
}
//TODO: revise
this.contacts = info.arr.ToList();
//this.count = info.count;
this.n = info.n;
this.e = a.e * b.e;
this.u = a.u * b.u;
cpVect surface_vr = cpVect.cpvsub(b.surfaceV, a.surfaceV);
this.surface_vr = cpVect.cpvsub(surface_vr, cpVect.cpvmult(info.n, cpVect.cpvdot(surface_vr, info.n)));
ulong typeA = info.a.type, typeB = info.b.type;
cpCollisionHandler defaultHandler = space.defaultHandler;
cpCollisionHandler handler = this.handler = space.LookupHandler(typeA, typeB, defaultHandler);
// Check if the types match, but don't swap for a default handler which use the wildcard for type A.
bool swapped = this.swapped = (typeA != handler.typeA && handler.typeA != cp.WILDCARD_COLLISION_TYPE);
if (handler != defaultHandler || space.usesWildcards)
{
// The order of the main handler swaps the wildcard handlers too. Uffda.
this.handlerA = space.LookupHandler(swapped ? typeB : typeA, cp.WILDCARD_COLLISION_TYPE, cpCollisionHandler.cpCollisionHandlerDoNothing);
this.handlerB = space.LookupHandler(swapped ? typeA : typeB, cp.WILDCARD_COLLISION_TYPE, cpCollisionHandler.cpCollisionHandlerDoNothing);
}
// mark it as new if it's been cached
if (this.state == cpArbiterState.Cached)
{
this.state = cpArbiterState.FirstCollision;
}
}
/// Causes a collision pair to be ignored as if you returned false from a begin callback.
/// If called from a pre-step callback, you will still need to return false
/// if you want it to be ignored in the current step.
public bool Ignore()
{
this.state = cpArbiterState.Ignore;
return(false);
}
public void Update(cpCollisionInfo info, cpSpace space)
{
cpShape a = info.a, b = info.b;
// For collisions between two similar primitive types, the order could have been swapped since the last frame.
this.a = a; this.body_a = a.body;
this.b = b; this.body_b = b.body;
// Iterate over the possible pairs to look for hash value matches.
for (int i = 0; i < info.count; i++)
{
cpContact con = info.arr[i];
// r1 and r2 store absolute offsets at init time.
// Need to convert them to relative offsets.
con.r1 = cpVect.cpvsub(con.r1, a.body.p);
con.r2 = cpVect.cpvsub(con.r2, b.body.p);
// Cached impulses are not zeroed at init time.
con.jnAcc = con.jtAcc = 0.0f;
for (int j = 0; j < this.Count; j++)
{
cpContact old = this.contacts[j];
// This could trigger false positives, but is fairly unlikely nor serious if it does.
if (con.hash == old.hash)
{
// Copy the persistant contact information.
con.jnAcc = old.jnAcc;
con.jtAcc = old.jtAcc;
}
}
}
//TODO: revise
this.contacts = info.arr.ToList();
//this.count = info.count;
this.n = info.n;
this.e = a.e * b.e;
this.u = a.u * b.u;
cpVect surface_vr = cpVect.cpvsub(b.surfaceV, a.surfaceV);
this.surface_vr = cpVect.cpvsub(surface_vr, cpVect.cpvmult(info.n, cpVect.cpvdot(surface_vr, info.n)));
ulong typeA = info.a.type, typeB = info.b.type;
cpCollisionHandler defaultHandler = space.defaultHandler;
cpCollisionHandler handler = this.handler = space.LookupHandler(typeA, typeB, defaultHandler);
// Check if the types match, but don't swap for a default handler which use the wildcard for type A.
bool swapped = this.swapped = (typeA != handler.typeA && handler.typeA != cp.WILDCARD_COLLISION_TYPE);
if (handler != defaultHandler || space.usesWildcards)
{
// The order of the main handler swaps the wildcard handlers too. Uffda.
this.handlerA = space.LookupHandler(swapped ? typeB : typeA, cp.WILDCARD_COLLISION_TYPE, cpCollisionHandler.cpCollisionHandlerDoNothing);
this.handlerB = space.LookupHandler(swapped ? typeA : typeB, cp.WILDCARD_COLLISION_TYPE, cpCollisionHandler.cpCollisionHandlerDoNothing);
}
// mark it as new if it's been cached
if (this.state == cpArbiterState.Cached)
this.state = cpArbiterState.FirstCollision;
}
/// Causes a collision pair to be ignored as if you returned false from a begin callback.
/// If called from a pre-step callback, you will still need to return false
/// if you want it to be ignored in the current step.
public bool Ignore()
{
this.state = cpArbiterState.Ignore;
return false;
}
/// A colliding pair of shapes.
public cpArbiter(cpShape a, cpShape b)
{
this.handler = null;
this.swapped = false;
this.handlerA = null;
this.handlerB = null;
/// Calculated value to use for the elasticity coefficient.
/// Override in a pre-solve collision handler for custom behavior.
this.e = 0;
/// Calculated value to use for the friction coefficient.
/// Override in a pre-solve collision handler for custom behavior.
this.u = 0;
/// Calculated value to use for applying surface velocities.
/// Override in a pre-solve collision handler for custom behavior.
this.surface_vr = cpVect.Zero;
this.a = a; this.body_a = a.body;
this.b = b; this.body_b = b.body;
this.thread_a = new cpArbiterThread(null, null);
this.thread_b = new cpArbiterThread(null, null);
this.contacts = new List<cpContact>();
this.stamp = 0;
this.state = cpArbiterState.FirstCollision;
}
