Merge pull request #1691 from Faless/area_combine_2d

Implement Area2D space_override_mode = COMBINE

2 files changed, 26 insertions, 18 deletions

diff --git a/servers/physics_2d/body_2d_sw.cpp b/servers/physics_2d/body_2d_sw.cpp
index fe45a3e640..98dabb4d3c 100644
--- a/servers/physics_2d/body_2d_sw.cpp
+++ b/servers/physics_2d/body_2d_sw.cpp
@@ -379,13 +379,12 @@ void Body2DSW::_compute_area_gravity(const Area2DSW *p_area) {
 
 	if (p_area->is_gravity_point()) {
 
-		gravity = (p_area->get_transform().xform(p_area->get_gravity_vector()) - get_transform().get_origin()).normalized() * p_area->get_gravity();
+		gravity += (p_area->get_transform().xform(p_area->get_gravity_vector()) - get_transform().get_origin()).normalized() * p_area->get_gravity();
 
 	} else {
-		gravity = p_area->get_gravity_vector() * p_area->get_gravity();
+		gravity += p_area->get_gravity_vector() * p_area->get_gravity();
 	}
 
-	gravity*=gravity_scale;
 }
 
 void Body2DSW::integrate_forces(real_t p_step) {
@@ -393,32 +392,39 @@ void Body2DSW::integrate_forces(real_t p_step) {
 	if (mode==Physics2DServer::BODY_MODE_STATIC)
 		return;
 
-	Area2DSW *current_area = get_space()->get_default_area();
-	ERR_FAIL_COND(!current_area);
+	Area2DSW *def_area = get_space()->get_default_area();
+	Area2DSW *damp_area = def_area;
+	ERR_FAIL_COND(!def_area);
 
-	int prio = current_area->get_priority();
 	int ac = areas.size();
+	bool replace = false;
+	gravity=Vector2(0,0);
 	if (ac) {
+		areas.sort();
 		const AreaCMP *aa = &areas[0];
-		for(int i=0;i<ac;i++) {
-			if (aa[i].area->get_priority() > prio) {
-				current_area=aa[i].area;
-				prio=current_area->get_priority();
+		damp_area = aa[ac-1].area;
+		for(int i=ac-1;i>=0;i--) {
+			_compute_area_gravity(aa[i].area);
+			if (aa[i].area->get_space_override_mode() == Physics2DServer::AREA_SPACE_OVERRIDE_REPLACE) {
+				replace = true;
+				break;
 			}
 		}
 	}
-
-	_compute_area_gravity(current_area);
+	if( !replace ) {
+		_compute_area_gravity(def_area);
+	}
+	gravity*=gravity_scale;
 
 	if (angular_damp>=0)
 		area_angular_damp=angular_damp;
 	else
-		area_angular_damp=current_area->get_angular_damp();
+		area_angular_damp=damp_area->get_angular_damp();
 
 	if (linear_damp>=0)
 		area_linear_damp=linear_damp;
 	else
-		area_linear_damp=current_area->get_linear_damp();
+		area_linear_damp=damp_area->get_linear_damp();
 
 	Vector2 motion;
 	bool do_motion=false;
@@ -482,7 +488,8 @@ void Body2DSW::integrate_forces(real_t p_step) {
 		_update_shapes_with_motion(motion);
 	}
 
-	current_area=NULL; // clear the area, so it is set in the next frame
+	damp_area=NULL; // clear the area, so it is set in the next frame
+	def_area=NULL; // clear the area, so it is set in the next frame
 	contact_count=0;	
 
 }
diff --git a/servers/physics_2d/body_2d_sw.h b/servers/physics_2d/body_2d_sw.h
index a6fc6fc97f..3b07401dd7 100644
--- a/servers/physics_2d/body_2d_sw.h
+++ b/servers/physics_2d/body_2d_sw.h
@@ -91,13 +91,14 @@ class Body2DSW : public CollisionObject2DSW {
 	struct AreaCMP {
 
 		Area2DSW *area;
-		_FORCE_INLINE_ bool operator<(const AreaCMP& p_cmp) const { return area->get_self() < p_cmp.area->get_self() ; }
+		_FORCE_INLINE_ bool operator==(const AreaCMP& p_cmp) const { return area->get_self() == p_cmp.area->get_self();}
+		_FORCE_INLINE_ bool operator<(const AreaCMP& p_cmp) const { return area->get_priority() < p_cmp.area->get_priority();}
 		_FORCE_INLINE_ AreaCMP() {}
 		_FORCE_INLINE_ AreaCMP(Area2DSW *p_area) { area=p_area;}
 	};
 
 
-	VSet<AreaCMP> areas;
+	Vector<AreaCMP> areas;
 
 	struct Contact {
 
@@ -140,7 +141,7 @@ public:
 	void set_force_integration_callback(ObjectID p_id, const StringName& p_method, const Variant &p_udata=Variant());
 
 
-	_FORCE_INLINE_ void add_area(Area2DSW *p_area) { areas.insert(AreaCMP(p_area)); }
+	_FORCE_INLINE_ void add_area(Area2DSW *p_area) { areas.ordered_insert(AreaCMP(p_area)); }
 	_FORCE_INLINE_ void remove_area(Area2DSW *p_area) { areas.erase(AreaCMP(p_area)); }
 
 	_FORCE_INLINE_ void set_max_contacts_reported(int p_size) { contacts.resize(p_size); contact_count=0; if (mode==Physics2DServer::BODY_MODE_KINEMATIC && p_size) set_active(true);}