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+// MIT License
+
+// Copyright (c) 2019 Erin Catto
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include "b2_chain_circle_contact.h"
+#include "b2_chain_polygon_contact.h"
+#include "b2_circle_contact.h"
+#include "b2_contact_solver.h"
+#include "b2_edge_circle_contact.h"
+#include "b2_edge_polygon_contact.h"
+#include "b2_polygon_circle_contact.h"
+#include "b2_polygon_contact.h"
+
+#include "box2d/b2_contact.h"
+#include "box2d/b2_block_allocator.h"
+#include "box2d/b2_body.h"
+#include "box2d/b2_collision.h"
+#include "box2d/b2_fixture.h"
+#include "box2d/b2_shape.h"
+#include "box2d/b2_time_of_impact.h"
+#include "box2d/b2_world.h"
+
+b2ContactRegister b2Contact::s_registers[b2Shape::e_typeCount][b2Shape::e_typeCount];
+bool b2Contact::s_initialized = false;
+
+void b2Contact::InitializeRegisters()
+{
+ AddType(b2CircleContact::Create, b2CircleContact::Destroy, b2Shape::e_circle, b2Shape::e_circle);
+ AddType(b2PolygonAndCircleContact::Create, b2PolygonAndCircleContact::Destroy, b2Shape::e_polygon, b2Shape::e_circle);
+ AddType(b2PolygonContact::Create, b2PolygonContact::Destroy, b2Shape::e_polygon, b2Shape::e_polygon);
+ AddType(b2EdgeAndCircleContact::Create, b2EdgeAndCircleContact::Destroy, b2Shape::e_edge, b2Shape::e_circle);
+ AddType(b2EdgeAndPolygonContact::Create, b2EdgeAndPolygonContact::Destroy, b2Shape::e_edge, b2Shape::e_polygon);
+ AddType(b2ChainAndCircleContact::Create, b2ChainAndCircleContact::Destroy, b2Shape::e_chain, b2Shape::e_circle);
+ AddType(b2ChainAndPolygonContact::Create, b2ChainAndPolygonContact::Destroy, b2Shape::e_chain, b2Shape::e_polygon);
+}
+
+void b2Contact::AddType(b2ContactCreateFcn* createFcn, b2ContactDestroyFcn* destoryFcn,
+ b2Shape::Type type1, b2Shape::Type type2)
+{
+ b2Assert(0 <= type1 && type1 < b2Shape::e_typeCount);
+ b2Assert(0 <= type2 && type2 < b2Shape::e_typeCount);
+
+ s_registers[type1][type2].createFcn = createFcn;
+ s_registers[type1][type2].destroyFcn = destoryFcn;
+ s_registers[type1][type2].primary = true;
+
+ if (type1 != type2)
+ {
+ s_registers[type2][type1].createFcn = createFcn;
+ s_registers[type2][type1].destroyFcn = destoryFcn;
+ s_registers[type2][type1].primary = false;
+ }
+}
+
+b2Contact* b2Contact::Create(b2Fixture* fixtureA, int32 indexA, b2Fixture* fixtureB, int32 indexB, b2BlockAllocator* allocator)
+{
+ if (s_initialized == false)
+ {
+ InitializeRegisters();
+ s_initialized = true;
+ }
+
+ b2Shape::Type type1 = fixtureA->GetType();
+ b2Shape::Type type2 = fixtureB->GetType();
+
+ b2Assert(0 <= type1 && type1 < b2Shape::e_typeCount);
+ b2Assert(0 <= type2 && type2 < b2Shape::e_typeCount);
+
+ b2ContactCreateFcn* createFcn = s_registers[type1][type2].createFcn;
+ if (createFcn)
+ {
+ if (s_registers[type1][type2].primary)
+ {
+ return createFcn(fixtureA, indexA, fixtureB, indexB, allocator);
+ }
+ else
+ {
+ return createFcn(fixtureB, indexB, fixtureA, indexA, allocator);
+ }
+ }
+ else
+ {
+ return nullptr;
+ }
+}
+
+void b2Contact::Destroy(b2Contact* contact, b2BlockAllocator* allocator)
+{
+ b2Assert(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();
+
+ b2Assert(0 <= typeA && typeA < b2Shape::e_typeCount);
+ b2Assert(0 <= typeB && typeB < b2Shape::e_typeCount);
+
+ b2ContactDestroyFcn* destroyFcn = s_registers[typeA][typeB].destroyFcn;
+ destroyFcn(contact, allocator);
+}
+
+b2Contact::b2Contact(b2Fixture* fA, int32 indexA, b2Fixture* fB, int32 indexB)
+{
+ m_flags = e_enabledFlag;
+
+ m_fixtureA = fA;
+ m_fixtureB = fB;
+
+ m_indexA = indexA;
+ m_indexB = indexB;
+
+ m_manifold.pointCount = 0;
+
+ m_prev = nullptr;
+ m_next = nullptr;
+
+ m_nodeA.contact = nullptr;
+ m_nodeA.prev = nullptr;
+ m_nodeA.next = nullptr;
+ m_nodeA.other = nullptr;
+
+ m_nodeB.contact = nullptr;
+ m_nodeB.prev = nullptr;
+ m_nodeB.next = nullptr;
+ m_nodeB.other = nullptr;
+
+ m_toiCount = 0;
+
+ m_friction = b2MixFriction(m_fixtureA->m_friction, m_fixtureB->m_friction);
+ m_restitution = b2MixRestitution(m_fixtureA->m_restitution, m_fixtureB->m_restitution);
+ m_restitutionThreshold = b2MixRestitutionThreshold(m_fixtureA->m_restitutionThreshold, m_fixtureB->m_restitutionThreshold);
+
+ m_tangentSpeed = 0.0f;
+}
+
+// Update the contact manifold and touching status.
+// Note: do not assume the fixture AABBs are overlapping or are valid.
+void b2Contact::Update(b2ContactListener* listener)
+{
+ b2Manifold oldManifold = m_manifold;
+
+ // Re-enable this contact.
+ m_flags |= e_enabledFlag;
+
+ bool touching = false;
+ bool wasTouching = (m_flags & e_touchingFlag) == e_touchingFlag;
+
+ bool sensorA = m_fixtureA->IsSensor();
+ bool sensorB = m_fixtureB->IsSensor();
+ bool sensor = sensorA || sensorB;
+
+ b2Body* bodyA = m_fixtureA->GetBody();
+ b2Body* bodyB = m_fixtureB->GetBody();
+ const b2Transform& xfA = bodyA->GetTransform();
+ const b2Transform& xfB = bodyB->GetTransform();
+
+ // Is this contact a sensor?
+ if (sensor)
+ {
+ const b2Shape* shapeA = m_fixtureA->GetShape();
+ const b2Shape* shapeB = m_fixtureB->GetShape();
+ touching = b2TestOverlap(shapeA, m_indexA, shapeB, m_indexB, xfA, xfB);
+
+ // Sensors don't generate manifolds.
+ m_manifold.pointCount = 0;
+ }
+ else
+ {
+ Evaluate(&m_manifold, xfA, xfB);
+ touching = m_manifold.pointCount > 0;
+
+ // Match old contact ids to new contact ids and copy the
+ // stored impulses to warm start the solver.
+ for (int32 i = 0; i < m_manifold.pointCount; ++i)
+ {
+ b2ManifoldPoint* mp2 = m_manifold.points + i;
+ mp2->normalImpulse = 0.0f;
+ mp2->tangentImpulse = 0.0f;
+ b2ContactID id2 = mp2->id;
+
+ for (int32 j = 0; j < oldManifold.pointCount; ++j)
+ {
+ b2ManifoldPoint* mp1 = oldManifold.points + j;
+
+ if (mp1->id.key == id2.key)
+ {
+ mp2->normalImpulse = mp1->normalImpulse;
+ mp2->tangentImpulse = mp1->tangentImpulse;
+ break;
+ }
+ }
+ }
+
+ if (touching != wasTouching)
+ {
+ bodyA->SetAwake(true);
+ bodyB->SetAwake(true);
+ }
+ }
+
+ if (touching)
+ {
+ m_flags |= e_touchingFlag;
+ }
+ else
+ {
+ m_flags &= ~e_touchingFlag;
+ }
+
+ if (wasTouching == false && touching == true && listener)
+ {
+ listener->BeginContact(this);
+ }
+
+ if (wasTouching == true && touching == false && listener)
+ {
+ listener->EndContact(this);
+ }
+
+ if (sensor == false && touching && listener)
+ {
+ listener->PreSolve(this, &oldManifold);
+ }
+}