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authorchai <chaifix@163.com>2019-03-19 23:06:27 +0800
committerchai <chaifix@163.com>2019-03-19 23:06:27 +0800
commit1497dccd63a84b7ee2b229b1ad9c5c02718f2a78 (patch)
treef8d1bff50da13e126d08c7345653e002e293202d /Source/3rdParty/Box2D/Dynamics/b2WorldCallbacks.h
parent5e2a973516e0729b225da9de0b03015dc5854ac4 (diff)
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-/*
-* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
-*
-* This software is provided 'as-is', without any express or implied
-* warranty. In no event will the authors be held liable for any damages
-* arising from the use of this software.
-* Permission is granted to anyone to use this software for any purpose,
-* including commercial applications, and to alter it and redistribute it
-* freely, subject to the following restrictions:
-* 1. The origin of this software must not be misrepresented; you must not
-* claim that you wrote the original software. If you use this software
-* in a product, an acknowledgment in the product documentation would be
-* appreciated but is not required.
-* 2. Altered source versions must be plainly marked as such, and must not be
-* misrepresented as being the original software.
-* 3. This notice may not be removed or altered from any source distribution.
-*/
-
-#ifndef B2_WORLD_CALLBACKS_H
-#define B2_WORLD_CALLBACKS_H
-
-#include "Box2D/Common/b2Settings.h"
-
-struct b2Vec2;
-struct b2Transform;
-class b2Fixture;
-class b2Body;
-class b2Joint;
-class b2Contact;
-struct b2ContactResult;
-struct b2Manifold;
-
-/// Joints and fixtures are destroyed when their associated
-/// body is destroyed. Implement this listener so that you
-/// may nullify references to these joints and shapes.
-class b2DestructionListener
-{
-public:
- virtual ~b2DestructionListener() {}
-
- /// Called when any joint is about to be destroyed due
- /// to the destruction of one of its attached bodies.
- virtual void SayGoodbye(b2Joint* joint) = 0;
-
- /// Called when any fixture is about to be destroyed due
- /// to the destruction of its parent body.
- virtual void SayGoodbye(b2Fixture* fixture) = 0;
-};
-
-/// Implement this class to provide collision filtering. In other words, you can implement
-/// this class if you want finer control over contact creation.
-class b2ContactFilter
-{
-public:
- virtual ~b2ContactFilter() {}
-
- /// Return true if contact calculations should be performed between these two shapes.
- /// @warning for performance reasons this is only called when the AABBs begin to overlap.
- virtual bool ShouldCollide(b2Fixture* fixtureA, b2Fixture* fixtureB);
-};
-
-/// Contact impulses for reporting. Impulses are used instead of forces because
-/// sub-step forces may approach infinity for rigid body collisions. These
-/// match up one-to-one with the contact points in b2Manifold.
-struct b2ContactImpulse
-{
- float32 normalImpulses[b2_maxManifoldPoints];
- float32 tangentImpulses[b2_maxManifoldPoints];
- int32 count;
-};
-
-/// Implement this class to get contact information. You can use these results for
-/// things like sounds and game logic. You can also get contact results by
-/// traversing the contact lists after the time step. However, you might miss
-/// some contacts because continuous physics leads to sub-stepping.
-/// Additionally you may receive multiple callbacks for the same contact in a
-/// single time step.
-/// You should strive to make your callbacks efficient because there may be
-/// many callbacks per time step.
-/// @warning You cannot create/destroy Box2D entities inside these callbacks.
-class b2ContactListener
-{
-public:
- virtual ~b2ContactListener() {}
-
- /// Called when two fixtures begin to touch.
- virtual void BeginContact(b2Contact* contact) { B2_NOT_USED(contact); }
-
- /// Called when two fixtures cease to touch.
- virtual void EndContact(b2Contact* contact) { B2_NOT_USED(contact); }
-
- /// This is called after a contact is updated. This allows you to inspect a
- /// contact before it goes to the solver. If you are careful, you can modify the
- /// contact manifold (e.g. disable contact).
- /// A copy of the old manifold is provided so that you can detect changes.
- /// Note: this is called only for awake bodies.
- /// Note: this is called even when the number of contact points is zero.
- /// Note: this is not called for sensors.
- /// Note: if you set the number of contact points to zero, you will not
- /// get an EndContact callback. However, you may get a BeginContact callback
- /// the next step.
- virtual void PreSolve(b2Contact* contact, const b2Manifold* oldManifold)
- {
- B2_NOT_USED(contact);
- B2_NOT_USED(oldManifold);
- }
-
- /// This lets you inspect a contact after the solver is finished. This is useful
- /// for inspecting impulses.
- /// Note: the contact manifold does not include time of impact impulses, which can be
- /// arbitrarily large if the sub-step is small. Hence the impulse is provided explicitly
- /// in a separate data structure.
- /// Note: this is only called for contacts that are touching, solid, and awake.
- virtual void PostSolve(b2Contact* contact, const b2ContactImpulse* impulse)
- {
- B2_NOT_USED(contact);
- B2_NOT_USED(impulse);
- }
-};
-
-/// Callback class for AABB queries.
-/// See b2World::Query
-class b2QueryCallback
-{
-public:
- virtual ~b2QueryCallback() {}
-
- /// Called for each fixture found in the query AABB.
- /// @return false to terminate the query.
- virtual bool ReportFixture(b2Fixture* fixture) = 0;
-};
-
-/// Callback class for ray casts.
-/// See b2World::RayCast
-class b2RayCastCallback
-{
-public:
- virtual ~b2RayCastCallback() {}
-
- /// Called for each fixture found in the query. You control how the ray cast
- /// proceeds by returning a float:
- /// return -1: ignore this fixture and continue
- /// return 0: terminate the ray cast
- /// return fraction: clip the ray to this point
- /// return 1: don't clip the ray and continue
- /// @param fixture the fixture hit by the ray
- /// @param point the point of initial intersection
- /// @param normal the normal vector at the point of intersection
- /// @return -1 to filter, 0 to terminate, fraction to clip the ray for
- /// closest hit, 1 to continue
- virtual float32 ReportFixture( b2Fixture* fixture, const b2Vec2& point,
- const b2Vec2& normal, float32 fraction) = 0;
-};
-
-#endif