[physics] add pre/post callback in `update()` (#19118)

* add physics update pre/post callback

* update space

* run before simulation

cocos/physics/CCPhysicsWorld.cpp

@@ -872,6 +872,9 @@ void PhysicsWorld::step(float delta)
 
 void PhysicsWorld::update(float delta, bool userCall/* = false*/)
 {
+
+    if(_preUpdateCallback) _preUpdateCallback(); //fix #11154
+
     if(!_delayAddBodies.empty())
     {
         updateBodies();
@@ -880,7 +883,7 @@ void PhysicsWorld::update(float delta, bool userCall/* = false*/)
     {
         updateBodies();
     }
-    
+
     auto sceneToWorldTransform = _scene->getNodeToParentTransform();
     beforeSimulation(_scene, sceneToWorldTransform, 1.f, 1.f, 0.f);
 
@@ -888,12 +891,12 @@ void PhysicsWorld::update(float delta, bool userCall/* = false*/)
     {
         updateJoints();
     }
-    
+
     if (delta < FLT_EPSILON)
     {
         return;
     }
-    
+
     if (userCall)
     {
 #if CC_TARGET_PLATFORM == CC_PLATFORM_WINRT || CC_TARGET_PLATFORM == CC_PLATFORM_WIN32
@@ -950,6 +953,8 @@ void PhysicsWorld::update(float delta, bool userCall/* = false*/)
     // Update physics position, should loop as the same sequence as node tree.
     // PhysicsWorld::afterSimulation() will depend on the sequence.
     afterSimulation(_scene, sceneToWorldTransform, 0.f);
+
+    if(_postUpdateCallback) _postUpdateCallback(); //fix #11154
 }
 
 PhysicsWorld* PhysicsWorld::construct(Scene* scene)
@@ -1033,6 +1038,16 @@ void PhysicsWorld::afterSimulation(Node *node, const Mat4& parentToWorldTransfor
         afterSimulation(child, nodeToWorldTransform, nodeRotation);
 }
 
+void PhysicsWorld::setPostUpdateCallback(const std::function<void()> &callback)
+{
+    _postUpdateCallback = callback;
+}
+
+void PhysicsWorld::setPreUpdateCallback(const std::function<void()> &callback)
+{
+    _preUpdateCallback = callback;
+}
+
 NS_CC_END
 
 #endif // CC_USE_PHYSICS

cocos/physics/CCPhysicsWorld.h

@@ -310,6 +310,16 @@ public:
     */
     void setDebugDrawMask(int mask);
 
+    /**
+     * set the callback which invoked before update of each object in physics world.
+     */
+    void setPreUpdateCallback(const std::function<void()> &callback);
+
+    /**
+     * set the callback which invoked after update of each object in physics world.
+     */
+    void setPostUpdateCallback(const std::function<void()> &callback);
+
     /**
     * Get the debug draw mask.
     *
@@ -352,7 +362,7 @@ protected:
     virtual void addShape(PhysicsShape* shape);
     virtual void removeShape(PhysicsShape* shape);
     virtual void update(float delta, bool userCall = false);
-    
+
     virtual void debugDraw();
     
     virtual bool collisionBeginCallback(PhysicsContact& contact);
@@ -367,7 +377,7 @@ protected:
     virtual void removeBodyOrDelay(PhysicsBody* body);
     virtual void updateBodies();
     virtual void updateJoints();
-    
+
 protected:
     Vec2 _gravity;
     float _speed;
@@ -394,6 +404,9 @@ protected:
     std::vector<PhysicsJoint*> _delayAddJoints;
     std::vector<PhysicsJoint*> _delayRemoveJoints;
     
+    std::function<void()> _preUpdateCallback;
+    std::function<void()> _postUpdateCallback;
+
 protected:
     PhysicsWorld();
     virtual ~PhysicsWorld();