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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
// Qt-Security score:significant reason:default
#ifndef TRIGGERBODY_H
#define TRIGGERBODY_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtQuick3DPhysics/qtquick3dphysicsglobal.h>
#include "qabstractphysicsnode_p.h"
+ #include <QtCore/QHash>
+ #include <QtCore/QSet>
#include <QtQml/QQmlEngine>
QT_BEGIN_NAMESPACE
class Q_QUICK3DPHYSICS_EXPORT QTriggerBody : public QAbstractPhysicsNode
{
Q_OBJECT
Q_PROPERTY(int collisionCount READ collisionCount NOTIFY collisionCountChanged)
QML_NAMED_ELEMENT(TriggerBody)
public:
QTriggerBody();
- void registerCollision(QAbstractPhysicsNode *collision);
- void deregisterCollision(QAbstractPhysicsNode *collision);
+ // One shape of the trigger together with one shape of a body, which is what
+ // the simulation reports an overlap for. The same shape listed twice on one
+ // node builds two PhysX shapes that name the same pair, which is the same
+ // answer: they are built from the same geometry at the same pose, so they
+ // start and stop overlapping in the same step.
+ using ShapePair = QPair<QAbstractCollisionShape *, QAbstractCollisionShape *>;
+
+ void registerCollision(QAbstractPhysicsNode *collision, ShapePair shapes);
+ void deregisterCollision(QAbstractPhysicsNode *collision, ShapePair shapes);
+ void invalidateOverlaps(QAbstractPhysicsNode *node);
+ void dropUnreportedOverlaps();
int collisionCount() const;
QAbstractPhysXNode *createPhysXBackend() final;
Q_SIGNALS:
void bodyEntered(QAbstractPhysicsNode *body);
void bodyExited(QAbstractPhysicsNode *body);
void collisionCountChanged();
private:
void dropDestroyedBody(QObject *body);
- QSet<QAbstractPhysicsNode *> m_collisions;
+ // What is currently reported as overlapping for one body: the shape pairs it
+ // is reported for, and those of them that are waiting to be reported again
+ // because the shapes on one side of them have been replaced.
+ struct Overlaps
+ {
+ QSet<ShapePair> pairs;
+ QSet<ShapePair> unreported;
+ // What the body asked for when it entered, so that the reports on the
+ // way out are the ones that were made on the way in even if it changes
+ // its mind while inside.
+ bool sends = false;
+ bool receives = false;
+ };
+
+ void reportEntered(QAbstractPhysicsNode *body, bool sends, bool receives);
+ void reportExited(QAbstractPhysicsNode *body, bool sends, bool receives);
+
+ // Keyed by body, so that one pair no longer overlapping does not report the
+ // whole body as having left. The shapes in the pairs are only ever compared,
+ // never dereferenced, since a shape can be gone before its pairs are.
+ QHash<QAbstractPhysicsNode *, Overlaps> m_collisions;
+ // How many of those asked to be counted and reported, kept as they come and
+ // go rather than counted on demand: a body that only asked to be told
+ // itself is held here too but is not one of these, and a trigger around a
+ // whole scene has an entry per body in it while this is read from bindings
+ // on every change.
+ int m_reportedCount = 0;
};
QT_END_NAMESPACE
#endif // TRIGGERBODY_H