From a625f7d07317ac4fac21962a99a7896ed13010c7 Mon Sep 17 00:00:00 2001
From: Juan Linietsky <reduzio@gmail.com>
Date: Tue, 12 Jan 2016 06:14:15 -0300
Subject: -Properly lock and and warn about switching off contact monitoring,
 fixes #3041

---
 scene/3d/physics_body.cpp | 24 ++++++++++++++++++++++++
 scene/3d/physics_body.h   |  2 +-
 2 files changed, 25 insertions(+), 1 deletion(-)

(limited to 'scene/3d')

diff --git a/scene/3d/physics_body.cpp b/scene/3d/physics_body.cpp
index de777604b0..1a2665b6ad 100644
--- a/scene/3d/physics_body.cpp
+++ b/scene/3d/physics_body.cpp
@@ -207,6 +207,9 @@ void RigidBody::_body_enter_tree(ObjectID p_id) {
 	ERR_FAIL_COND(E->get().in_tree);
 
 	E->get().in_tree=true;
+
+	contact_monitor->locked=true;
+
 	emit_signal(SceneStringNames::get_singleton()->body_enter,node);
 
 	for(int i=0;i<E->get().shapes.size();i++) {
@@ -214,6 +217,9 @@ void RigidBody::_body_enter_tree(ObjectID p_id) {
 		emit_signal(SceneStringNames::get_singleton()->body_enter_shape,p_id,node,E->get().shapes[i].body_shape,E->get().shapes[i].local_shape);
 	}
 
+	contact_monitor->locked=false;
+
+
 }
 
 void RigidBody::_body_exit_tree(ObjectID p_id) {
@@ -225,11 +231,18 @@ void RigidBody::_body_exit_tree(ObjectID p_id) {
 	ERR_FAIL_COND(!E);
 	ERR_FAIL_COND(!E->get().in_tree);
 	E->get().in_tree=false;
+
+	contact_monitor->locked=true;
+
 	emit_signal(SceneStringNames::get_singleton()->body_exit,node);
+
 	for(int i=0;i<E->get().shapes.size();i++) {
 
 		emit_signal(SceneStringNames::get_singleton()->body_exit_shape,p_id,node,E->get().shapes[i].body_shape,E->get().shapes[i].local_shape);
 	}
+
+	contact_monitor->locked=false;
+
 }
 
 void RigidBody::_body_inout(int p_status, ObjectID p_instance, int p_body_shape,int p_local_shape) {
@@ -317,6 +330,8 @@ void RigidBody::_direct_state_changed(Object *p_state) {
 
 	if (contact_monitor) {
 
+		contact_monitor->locked=true;
+
 		//untag all
 		int rc=0;
 		for( Map<ObjectID,BodyState>::Element *E=contact_monitor->body_map.front();E;E=E->next()) {
@@ -396,6 +411,8 @@ void RigidBody::_direct_state_changed(Object *p_state) {
 			_body_inout(1,toadd[i].id,toadd[i].shape,toadd[i].local_shape);
 		}
 
+		contact_monitor->locked=false;
+
 	}
 
 	set_ignore_transform_notification(true);
@@ -648,6 +665,11 @@ void RigidBody::set_contact_monitor(bool p_enabled) {
 
 	if (!p_enabled) {
 
+		if (contact_monitor->locked) {
+			ERR_EXPLAIN("Can't disable contact monitoring during in/out callback. Use call_deferred(\"set_contact_monitor\",false) instead");
+		}
+		ERR_FAIL_COND(contact_monitor->locked);
+
 		for(Map<ObjectID,BodyState>::Element *E=contact_monitor->body_map.front();E;E=E->next()) {
 
 			//clean up mess
@@ -658,6 +680,8 @@ void RigidBody::set_contact_monitor(bool p_enabled) {
 	} else {
 
 		contact_monitor = memnew( ContactMonitor );
+		contact_monitor->locked=false;
+
 	}
 
 }
diff --git a/scene/3d/physics_body.h b/scene/3d/physics_body.h
index 0d6c358e28..da79d63f00 100644
--- a/scene/3d/physics_body.h
+++ b/scene/3d/physics_body.h
@@ -175,7 +175,7 @@ private:
 
 	struct ContactMonitor {
 
-
+		bool locked;
 		Map<ObjectID,BodyState> body_map;
 
 	};
-- 
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