TriggerObserver.hpp

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#pragma once
 
#include <BulletCollision/CollisionDispatch/btCollisionWorld.h>
#include <functional>
 
class btCollisionObject;
 
namespace Physics {
 
class TriggerObserver : public btCollisionWorld::ContactResultCallback {
  public:
    enum class IntersectionPhase {
        Enter,
        Retained,
        Leave,
        None,
    };
 
  public:
 
    explicit TriggerObserver(btCollisionObject& body);
 
 
    btCollisionObject* GetBulletCollisionObject();
 
 
    IntersectionPhase GetPhase() const;
 
    void PostIntersectionTest();
 
 
    void OnEnter(const std::function<void()>& handler);
 
    void ForgetEnter();
 
 
    void OnRetain(const std::function<void()>& handler);
 
    void ForgetRetain();
 
 
    void OnLeave(const std::function<void()>& handler);
 
    void ForgetLeave();
 
  private:
    // Overridden from btCollisionWorld::ContactResultCallback for
    // custom intersection handling.
    btScalar addSingleResult(btManifoldPoint& cp, const btCollisionObjectWrapper* colObj0, int partId0, int index0, const btCollisionObjectWrapper* colObj1, int partId1, int index1) override;
 
    IntersectionPhase phase = IntersectionPhase::None;
    btCollisionObject& rigidBody;
 
    // Control value to determine whether an intersection happened
    // during this frame. This is used to determine the new phase.
    bool didCallback = false;
 
    std::function<void()> enterHandler;
    std::function<void()> retainHandler;
    std::function<void()> leaveHandler;
};
} // namespace Physics