BGE patch: logic optimization part 2: remove inactive sensors from logic manager.

With this patch, only sensors that are connected to 
active states are actually registered in the logic
manager. Inactive sensors won't take any CPU,
especially the Radar and Near sensors that use a
physical object for the detection: these objects
are removed from the physics engine.

To take advantage of this optimization patch, you
need to define very light idle state when the 
objects are inactive: make them transparent, suspend
the physics, keep few sensors active (e,g a message
sensor to wake up), etc.

3 files changed, 18 insertions, 6 deletions

diff --git a/source/gameengine/Physics/Sumo/Fuzzics/src/SM_Scene.cpp b/source/gameengine/Physics/Sumo/Fuzzics/src/SM_Scene.cpp
index b5bf67b14ea..f0791bbf89f 100644
--- a/source/gameengine/Physics/Sumo/Fuzzics/src/SM_Scene.cpp
+++ b/source/gameengine/Physics/Sumo/Fuzzics/src/SM_Scene.cpp
@@ -98,12 +98,17 @@ void SM_Scene::addTouchCallback(int response_class, DT_ResponseCallback callback
 
 void SM_Scene::addSensor(SM_Object& object) 
 {
-	object.calcXform();
-	m_objectList.push_back(&object);
-	DT_AddObject(m_scene, object.getObjectHandle());
-	DT_SetResponseClass(m_respTable, object.getObjectHandle(), m_ResponseClass[SENSOR_RESPONSE]);
-	DT_SetResponseClass(m_secondaryRespTable, object.getObjectHandle(), m_secondaryResponseClass[SENSOR_RESPONSE]);
-	DT_SetResponseClass(m_fixRespTable, object.getObjectHandle(), m_fixResponseClass[SENSOR_RESPONSE]);
+	T_ObjectList::iterator i =
+		std::find(m_objectList.begin(), m_objectList.end(), &object);
+	if (i == m_objectList.end())
+	{
+		object.calcXform();
+		m_objectList.push_back(&object);
+		DT_AddObject(m_scene, object.getObjectHandle());
+		DT_SetResponseClass(m_respTable, object.getObjectHandle(), m_ResponseClass[SENSOR_RESPONSE]);
+		DT_SetResponseClass(m_secondaryRespTable, object.getObjectHandle(), m_secondaryResponseClass	[SENSOR_RESPONSE]);
+		DT_SetResponseClass(m_fixRespTable, object.getObjectHandle(), m_fixResponseClass[SENSOR_RESPONSE]);
+	}
 }
 
 void SM_Scene::add(SM_Object& object) {
diff --git a/source/gameengine/Physics/Sumo/SumoPhysicsEnvironment.cpp b/source/gameengine/Physics/Sumo/SumoPhysicsEnvironment.cpp
index 16ba45a0be5..65018d2523e 100644
--- a/source/gameengine/Physics/Sumo/SumoPhysicsEnvironment.cpp
+++ b/source/gameengine/Physics/Sumo/SumoPhysicsEnvironment.cpp
@@ -228,6 +228,12 @@ void SumoPhysicsEnvironment::requestCollisionCallback(PHY_IPhysicsController* ct
 		m_sumoScene->requestCollisionCallback(*smObject);
 	}
 }
+
+void SumoPhysicsEnvironment::removeCollisionCallback(PHY_IPhysicsController* ctrl)
+{
+	// intentionally empty
+}
+
 PHY_IPhysicsController*	SumoPhysicsEnvironment::CreateSphereController(float radius,const PHY__Vector3& position)
 {
 	DT_ShapeHandle shape	=	DT_NewSphere(0.0);
diff --git a/source/gameengine/Physics/Sumo/SumoPhysicsEnvironment.h b/source/gameengine/Physics/Sumo/SumoPhysicsEnvironment.h
index ce5cd70e8cc..8b9fb463034 100644
--- a/source/gameengine/Physics/Sumo/SumoPhysicsEnvironment.h
+++ b/source/gameengine/Physics/Sumo/SumoPhysicsEnvironment.h
@@ -84,6 +84,7 @@ public:
 	virtual void removeSensor(PHY_IPhysicsController* ctrl);
 	virtual void addTouchCallback(int response_class, PHY_ResponseCallback callback, void *user);
 	virtual void requestCollisionCallback(PHY_IPhysicsController* ctrl);
+	virtual void removeCollisionCallback(PHY_IPhysicsController* ctrl);
 	virtual PHY_IPhysicsController*	CreateSphereController(float radius,const PHY__Vector3& position);
 	virtual PHY_IPhysicsController* CreateConeController(float coneradius,float coneheight);