From 7879efc50b46fc06cb451e6c6758245b289d7d22 Mon Sep 17 00:00:00 2001
From: Juan Linietsky <reduzio@gmail.com>
Date: Fri, 1 Jan 2016 10:45:24 -0300
Subject: Make both lights and occluders stop working if hidden, fixes #2437

---
 scene/2d/light_2d.cpp                   | 17 ++++++++++++++++-
 scene/2d/light_2d.h                     |  1 +
 scene/2d/light_occluder_2d.cpp          |  5 +++++
 servers/visual/visual_server_raster.cpp |  2 ++
 4 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/scene/2d/light_2d.cpp b/scene/2d/light_2d.cpp
index a2112c7d37..9715afeaa4 100644
--- a/scene/2d/light_2d.cpp
+++ b/scene/2d/light_2d.cpp
@@ -34,10 +34,19 @@ Rect2 Light2D::get_item_rect() const {
 }
 
 
+void Light2D::_update_light_visibility() {
+
+	if (!is_inside_tree())
+		return;
+
+	VS::get_singleton()->canvas_light_set_enabled(canvas_light,enabled && is_visible());
+}
+
 void Light2D::set_enabled( bool p_enabled) {
 
-	VS::get_singleton()->canvas_light_set_enabled(canvas_light,p_enabled);
+
 	enabled=p_enabled;
+	_update_light_visibility();
 }
 
 bool Light2D::is_enabled() const {
@@ -253,16 +262,22 @@ void Light2D::_notification(int p_what) {
 	if (p_what==NOTIFICATION_ENTER_TREE) {
 
 		VS::get_singleton()->canvas_light_attach_to_canvas( canvas_light, get_canvas() );
+		_update_light_visibility();
 	}
 
 	if (p_what==NOTIFICATION_TRANSFORM_CHANGED) {
 
 		VS::get_singleton()->canvas_light_set_transform( canvas_light, get_global_transform());
 	}
+	if (p_what==NOTIFICATION_VISIBILITY_CHANGED) {
+
+		_update_light_visibility();
+	}
 
 	if (p_what==NOTIFICATION_EXIT_TREE) {
 
 		VS::get_singleton()->canvas_light_attach_to_canvas( canvas_light, RID() );
+		_update_light_visibility();
 	}
 
 }
diff --git a/scene/2d/light_2d.h b/scene/2d/light_2d.h
index 0828d9ac33..ca437769e7 100644
--- a/scene/2d/light_2d.h
+++ b/scene/2d/light_2d.h
@@ -35,6 +35,7 @@ private:
 	Ref<Texture> texture;
 	Vector2 texture_offset;
 
+	void _update_light_visibility();
 protected:
 
 	void _notification(int p_what);
diff --git a/scene/2d/light_occluder_2d.cpp b/scene/2d/light_occluder_2d.cpp
index 6ebd499f71..d98bed0ea3 100644
--- a/scene/2d/light_occluder_2d.cpp
+++ b/scene/2d/light_occluder_2d.cpp
@@ -93,12 +93,17 @@ void LightOccluder2D::_notification(int p_what) {
 
 		VS::get_singleton()->canvas_light_occluder_attach_to_canvas(occluder,get_canvas());
 		VS::get_singleton()->canvas_light_occluder_set_transform(occluder,get_global_transform());
+		VS::get_singleton()->canvas_light_occluder_set_enabled(occluder,is_visible());
 
 	}
 	if (p_what==NOTIFICATION_TRANSFORM_CHANGED) {
 
 		VS::get_singleton()->canvas_light_occluder_set_transform(occluder,get_global_transform());
 	}
+	if (p_what==NOTIFICATION_VISIBILITY_CHANGED) {
+
+		VS::get_singleton()->canvas_light_occluder_set_enabled(occluder,is_visible());
+	}
 
 	if (p_what==NOTIFICATION_DRAW) {
 
diff --git a/servers/visual/visual_server_raster.cpp b/servers/visual/visual_server_raster.cpp
index 79911121f5..3be272461d 100644
--- a/servers/visual/visual_server_raster.cpp
+++ b/servers/visual/visual_server_raster.cpp
@@ -7182,6 +7182,8 @@ void VisualServerRaster::_draw_viewport(Viewport *p_viewport,int p_ofs_x, int p_
 
 				for(Set<Rasterizer::CanvasLightOccluderInstance*>::Element *F=E->get().canvas->occluders.front();F;F=F->next()) {
 
+					if (!F->get()->enabled)
+						continue;
 					F->get()->xform_cache = xf * F->get()->xform;
 					if (shadow_rect.intersects_transformed(F->get()->xform_cache,F->get()->aabb_cache)) {
 
-- 
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