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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.
+*/
+
+#include "Box2D/Dynamics/b2Fixture.h"
+#include "Box2D/Dynamics/Contacts/b2Contact.h"
+#include "Box2D/Dynamics/b2World.h"
+#include "Box2D/Collision/Shapes/b2CircleShape.h"
+#include "Box2D/Collision/Shapes/b2EdgeShape.h"
+#include "Box2D/Collision/Shapes/b2PolygonShape.h"
+#include "Box2D/Collision/Shapes/b2ChainShape.h"
+#include "Box2D/Collision/b2BroadPhase.h"
+#include "Box2D/Collision/b2Collision.h"
+#include "Box2D/Common/b2BlockAllocator.h"
+
+b2Fixture::b2Fixture()
+{
+ m_userData = nullptr;
+ m_body = nullptr;
+ m_next = nullptr;
+ m_proxies = nullptr;
+ m_proxyCount = 0;
+ m_shape = nullptr;
+ m_density = 0.0f;
+}
+
+void b2Fixture::Create(b2BlockAllocator* allocator, b2Body* body, const b2FixtureDef* def)
+{
+ m_userData = def->userData;
+ m_friction = def->friction;
+ m_restitution = def->restitution;
+
+ m_body = body;
+ m_next = nullptr;
+
+ m_filter = def->filter;
+
+ m_isSensor = def->isSensor;
+
+ m_shape = def->shape->Clone(allocator);
+
+ // Reserve proxy space
+ int32 childCount = m_shape->GetChildCount();
+ m_proxies = (b2FixtureProxy*)allocator->Allocate(childCount * sizeof(b2FixtureProxy));
+ for (int32 i = 0; i < childCount; ++i)
+ {
+ m_proxies[i].fixture = nullptr;
+ m_proxies[i].proxyId = b2BroadPhase::e_nullProxy;
+ }
+ m_proxyCount = 0;
+
+ m_density = def->density;
+}
+
+void b2Fixture::Destroy(b2BlockAllocator* allocator)
+{
+ // The proxies must be destroyed before calling this.
+ b2Assert(m_proxyCount == 0);
+
+ // Free the proxy array.
+ int32 childCount = m_shape->GetChildCount();
+ allocator->Free(m_proxies, childCount * sizeof(b2FixtureProxy));
+ m_proxies = nullptr;
+
+ // Free the child shape.
+ switch (m_shape->m_type)
+ {
+ case b2Shape::e_circle:
+ {
+ b2CircleShape* s = (b2CircleShape*)m_shape;
+ s->~b2CircleShape();
+ allocator->Free(s, sizeof(b2CircleShape));
+ }
+ break;
+
+ case b2Shape::e_edge:
+ {
+ b2EdgeShape* s = (b2EdgeShape*)m_shape;
+ s->~b2EdgeShape();
+ allocator->Free(s, sizeof(b2EdgeShape));
+ }
+ break;
+
+ case b2Shape::e_polygon:
+ {
+ b2PolygonShape* s = (b2PolygonShape*)m_shape;
+ s->~b2PolygonShape();
+ allocator->Free(s, sizeof(b2PolygonShape));
+ }
+ break;
+
+ case b2Shape::e_chain:
+ {
+ b2ChainShape* s = (b2ChainShape*)m_shape;
+ s->~b2ChainShape();
+ allocator->Free(s, sizeof(b2ChainShape));
+ }
+ break;
+
+ default:
+ b2Assert(false);
+ break;
+ }
+
+ m_shape = nullptr;
+}
+
+void b2Fixture::CreateProxies(b2BroadPhase* broadPhase, const b2Transform& xf)
+{
+ b2Assert(m_proxyCount == 0);
+
+ // Create proxies in the broad-phase.
+ m_proxyCount = m_shape->GetChildCount();
+
+ for (int32 i = 0; i < m_proxyCount; ++i)
+ {
+ b2FixtureProxy* proxy = m_proxies + i;
+ m_shape->ComputeAABB(&proxy->aabb, xf, i);
+ proxy->proxyId = broadPhase->CreateProxy(proxy->aabb, proxy);
+ proxy->fixture = this;
+ proxy->childIndex = i;
+ }
+}
+
+void b2Fixture::DestroyProxies(b2BroadPhase* broadPhase)
+{
+ // Destroy proxies in the broad-phase.
+ for (int32 i = 0; i < m_proxyCount; ++i)
+ {
+ b2FixtureProxy* proxy = m_proxies + i;
+ broadPhase->DestroyProxy(proxy->proxyId);
+ proxy->proxyId = b2BroadPhase::e_nullProxy;
+ }
+
+ m_proxyCount = 0;
+}
+
+void b2Fixture::Synchronize(b2BroadPhase* broadPhase, const b2Transform& transform1, const b2Transform& transform2)
+{
+ if (m_proxyCount == 0)
+ {
+ return;
+ }
+
+ for (int32 i = 0; i < m_proxyCount; ++i)
+ {
+ b2FixtureProxy* proxy = m_proxies + i;
+
+ // Compute an AABB that covers the swept shape (may miss some rotation effect).
+ b2AABB aabb1, aabb2;
+ m_shape->ComputeAABB(&aabb1, transform1, proxy->childIndex);
+ m_shape->ComputeAABB(&aabb2, transform2, proxy->childIndex);
+
+ proxy->aabb.Combine(aabb1, aabb2);
+
+ b2Vec2 displacement = transform2.p - transform1.p;
+
+ broadPhase->MoveProxy(proxy->proxyId, proxy->aabb, displacement);
+ }
+}
+
+void b2Fixture::SetFilterData(const b2Filter& filter)
+{
+ m_filter = filter;
+
+ Refilter();
+}
+
+void b2Fixture::Refilter()
+{
+ if (m_body == nullptr)
+ {
+ return;
+ }
+
+ // Flag associated contacts for filtering.
+ b2ContactEdge* edge = m_body->GetContactList();
+ while (edge)
+ {
+ b2Contact* contact = edge->contact;
+ b2Fixture* fixtureA = contact->GetFixtureA();
+ b2Fixture* fixtureB = contact->GetFixtureB();
+ if (fixtureA == this || fixtureB == this)
+ {
+ contact->FlagForFiltering();
+ }
+
+ edge = edge->next;
+ }
+
+ b2World* world = m_body->GetWorld();
+
+ if (world == nullptr)
+ {
+ return;
+ }
+
+ // Touch each proxy so that new pairs may be created
+ b2BroadPhase* broadPhase = &world->m_contactManager.m_broadPhase;
+ for (int32 i = 0; i < m_proxyCount; ++i)
+ {
+ broadPhase->TouchProxy(m_proxies[i].proxyId);
+ }
+}
+
+void b2Fixture::SetSensor(bool sensor)
+{
+ if (sensor != m_isSensor)
+ {
+ m_body->SetAwake(true);
+ m_isSensor = sensor;
+ }
+}
+
+void b2Fixture::Dump(int32 bodyIndex)
+{
+ b2Log(" b2FixtureDef fd;\n");
+ b2Log(" fd.friction = %.15lef;\n", m_friction);
+ b2Log(" fd.restitution = %.15lef;\n", m_restitution);
+ b2Log(" fd.density = %.15lef;\n", m_density);
+ b2Log(" fd.isSensor = bool(%d);\n", m_isSensor);
+ b2Log(" fd.filter.categoryBits = uint16(%d);\n", m_filter.categoryBits);
+ b2Log(" fd.filter.maskBits = uint16(%d);\n", m_filter.maskBits);
+ b2Log(" fd.filter.groupIndex = int16(%d);\n", m_filter.groupIndex);
+
+ switch (m_shape->m_type)
+ {
+ case b2Shape::e_circle:
+ {
+ b2CircleShape* s = (b2CircleShape*)m_shape;
+ b2Log(" b2CircleShape shape;\n");
+ b2Log(" shape.m_radius = %.15lef;\n", s->m_radius);
+ b2Log(" shape.m_p.Set(%.15lef, %.15lef);\n", s->m_p.x, s->m_p.y);
+ }
+ break;
+
+ case b2Shape::e_edge:
+ {
+ b2EdgeShape* s = (b2EdgeShape*)m_shape;
+ b2Log(" b2EdgeShape shape;\n");
+ b2Log(" shape.m_radius = %.15lef;\n", s->m_radius);
+ b2Log(" shape.m_vertex0.Set(%.15lef, %.15lef);\n", s->m_vertex0.x, s->m_vertex0.y);
+ b2Log(" shape.m_vertex1.Set(%.15lef, %.15lef);\n", s->m_vertex1.x, s->m_vertex1.y);
+ b2Log(" shape.m_vertex2.Set(%.15lef, %.15lef);\n", s->m_vertex2.x, s->m_vertex2.y);
+ b2Log(" shape.m_vertex3.Set(%.15lef, %.15lef);\n", s->m_vertex3.x, s->m_vertex3.y);
+ b2Log(" shape.m_hasVertex0 = bool(%d);\n", s->m_hasVertex0);
+ b2Log(" shape.m_hasVertex3 = bool(%d);\n", s->m_hasVertex3);
+ }
+ break;
+
+ case b2Shape::e_polygon:
+ {
+ b2PolygonShape* s = (b2PolygonShape*)m_shape;
+ b2Log(" b2PolygonShape shape;\n");
+ b2Log(" b2Vec2 vs[%d];\n", b2_maxPolygonVertices);
+ for (int32 i = 0; i < s->m_count; ++i)
+ {
+ b2Log(" vs[%d].Set(%.15lef, %.15lef);\n", i, s->m_vertices[i].x, s->m_vertices[i].y);
+ }
+ b2Log(" shape.Set(vs, %d);\n", s->m_count);
+ }
+ break;
+
+ case b2Shape::e_chain:
+ {
+ b2ChainShape* s = (b2ChainShape*)m_shape;
+ b2Log(" b2ChainShape shape;\n");
+ b2Log(" b2Vec2 vs[%d];\n", s->m_count);
+ for (int32 i = 0; i < s->m_count; ++i)
+ {
+ b2Log(" vs[%d].Set(%.15lef, %.15lef);\n", i, s->m_vertices[i].x, s->m_vertices[i].y);
+ }
+ b2Log(" shape.CreateChain(vs, %d);\n", s->m_count);
+ b2Log(" shape.m_prevVertex.Set(%.15lef, %.15lef);\n", s->m_prevVertex.x, s->m_prevVertex.y);
+ b2Log(" shape.m_nextVertex.Set(%.15lef, %.15lef);\n", s->m_nextVertex.x, s->m_nextVertex.y);
+ b2Log(" shape.m_hasPrevVertex = bool(%d);\n", s->m_hasPrevVertex);
+ b2Log(" shape.m_hasNextVertex = bool(%d);\n", s->m_hasNextVertex);
+ }
+ break;
+
+ default:
+ return;
+ }
+
+ b2Log("\n");
+ b2Log(" fd.shape = &shape;\n");
+ b2Log("\n");
+ b2Log(" bodies[%d]->CreateFixture(&fd);\n", bodyIndex);
+}