godot/scene/main/viewport.cpp

/*************************************************************************/
/*  viewport.cpp                                                         */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#include "viewport.h"

#include "core/os/input.h"
#include "core/os/os.h"
#include "core/project_settings.h"
#include "scene/2d/collision_object_2d.h"
#include "scene/3d/camera.h"
#include "scene/3d/collision_object.h"
#include "scene/3d/listener.h"
#include "scene/3d/spatial.h"
#include "scene/3d/world_environment.h"
#include "scene/gui/control.h"
#include "scene/gui/label.h"
#include "scene/gui/menu_button.h"
#include "scene/gui/panel.h"
#include "scene/gui/panel_container.h"
#include "scene/gui/popup_menu.h"
#include "scene/main/canvas_layer.h"
#include "scene/main/timer.h"
#include "scene/resources/mesh.h"
#include "scene/scene_string_names.h"
#include "servers/physics_2d_server.h"

void ViewportTexture::setup_local_to_scene() {

	if (vp) {
		vp->viewport_textures.erase(this);
	}

	vp = NULL;

	Node *local_scene = get_local_scene();
	if (!local_scene) {
		return;
	}

	Node *vpn = local_scene->get_node(path);
	ERR_EXPLAIN("ViewportTexture: Path to node is invalid");
	ERR_FAIL_COND(!vpn);

	vp = Object::cast_to<Viewport>(vpn);

	ERR_EXPLAIN("ViewportTexture: Path to node does not point to a viewport");
	ERR_FAIL_COND(!vp);

	vp->viewport_textures.insert(this);

	VS::get_singleton()->texture_set_proxy(proxy, vp->texture_rid);

	vp->texture_flags = flags;
	VS::get_singleton()->texture_set_flags(vp->texture_rid, flags);
}

void ViewportTexture::set_viewport_path_in_scene(const NodePath &p_path) {

	if (path == p_path)
		return;

	path = p_path;

	if (get_local_scene()) {
		setup_local_to_scene();
	}
}

NodePath ViewportTexture::get_viewport_path_in_scene() const {

	return path;
}

int ViewportTexture::get_width() const {

	ERR_FAIL_COND_V(!vp, 0);
	return vp->size.width;
}
int ViewportTexture::get_height() const {

	ERR_FAIL_COND_V(!vp, 0);
	return vp->size.height;
}
Size2 ViewportTexture::get_size() const {

	ERR_FAIL_COND_V(!vp, Size2());
	return vp->size;
}
RID ViewportTexture::get_rid() const {

	//ERR_FAIL_COND_V(!vp, RID());
	return proxy;
}

bool ViewportTexture::has_alpha() const {

	return false;
}
Ref<Image> ViewportTexture::get_data() const {

	ERR_FAIL_COND_V(!vp, Ref<Image>());
	return VS::get_singleton()->texture_get_data(vp->texture_rid);
}
void ViewportTexture::set_flags(uint32_t p_flags) {
	flags = p_flags;

	if (!vp)
		return;

	vp->texture_flags = flags;
	VS::get_singleton()->texture_set_flags(vp->texture_rid, flags);
}

uint32_t ViewportTexture::get_flags() const {

	return flags;
}

void ViewportTexture::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_viewport_path_in_scene", "path"), &ViewportTexture::set_viewport_path_in_scene);
	ClassDB::bind_method(D_METHOD("get_viewport_path_in_scene"), &ViewportTexture::get_viewport_path_in_scene);

	ADD_PROPERTY(PropertyInfo(Variant::NODE_PATH, "viewport_path", PROPERTY_HINT_NODE_PATH_VALID_TYPES, "Viewport", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_NODE_PATH_FROM_SCENE_ROOT), "set_viewport_path_in_scene", "get_viewport_path_in_scene");
}

ViewportTexture::ViewportTexture() {

	vp = NULL;
	flags = 0;
	set_local_to_scene(true);
	proxy = VS::get_singleton()->texture_create();
}

ViewportTexture::~ViewportTexture() {

	if (vp) {
		vp->viewport_textures.erase(this);
	}

	VS::get_singleton()->free(proxy);
}

/////////////////////////////////////

class TooltipPanel : public PanelContainer {

	GDCLASS(TooltipPanel, PanelContainer)
public:
	TooltipPanel(){};
};

class TooltipLabel : public Label {

	GDCLASS(TooltipLabel, Label)
public:
	TooltipLabel(){};
};

Viewport::GUI::GUI() {

	dragging = false;
	mouse_focus = NULL;
	mouse_click_grabber = NULL;
	mouse_focus_mask = 0;
	key_focus = NULL;
	mouse_over = NULL;

	tooltip = NULL;
	tooltip_popup = NULL;
	tooltip_label = NULL;
	subwindow_visibility_dirty = false;
	subwindow_order_dirty = false;
}

/////////////////////////////////////

void Viewport::_update_stretch_transform() {

	if (size_override_stretch && size_override) {

		stretch_transform = Transform2D();
		Size2 scale = size / (size_override_size + size_override_margin * 2);
		stretch_transform.scale(scale);
		stretch_transform.elements[2] = size_override_margin * scale;

	} else {

		stretch_transform = Transform2D();
	}

	_update_global_transform();
}

void Viewport::update_worlds() {

	if (!is_inside_tree())
		return;

	Rect2 abstracted_rect = Rect2(Vector2(), get_visible_rect().size);
	Rect2 xformed_rect = (global_canvas_transform * canvas_transform).affine_inverse().xform(abstracted_rect);
	find_world_2d()->_update_viewport(this, xformed_rect);
	find_world_2d()->_update();

	find_world()->_update(get_tree()->get_frame());
}

void Viewport::_collision_object_input_event(CollisionObject *p_object, Camera *p_camera, const Ref<InputEvent> &p_input_event, const Vector3 &p_pos, const Vector3 &p_normal, int p_shape) {

	Transform object_transform = p_object->get_global_transform();
	Transform camera_transform = p_camera->get_global_transform();
	ObjectID id = p_object->get_instance_id();

	//avoid sending the fake event unnecessarily if nothing really changed in the context
	if (object_transform == physics_last_object_transform && camera_transform == physics_last_camera_transform && physics_last_id == id) {
		Ref<InputEventMouseMotion> mm = p_input_event;
		if (mm.is_valid() && mm->get_device() == InputEvent::DEVICE_ID_INTERNAL) {
			return; //discarded
		}
	}
	p_object->_input_event(camera, p_input_event, p_pos, p_normal, p_shape);
	physics_last_object_transform = object_transform;
	physics_last_camera_transform = camera_transform;
	physics_last_id = id;
}

void Viewport::_notification(int p_what) {

	switch (p_what) {

		case NOTIFICATION_ENTER_TREE: {

			if (get_parent()) {
				parent = get_parent()->get_viewport();
				VisualServer::get_singleton()->viewport_set_parent_viewport(viewport, parent->get_viewport_rid());
			} else {
				parent = NULL;
			}

			current_canvas = find_world_2d()->get_canvas();
			VisualServer::get_singleton()->viewport_set_scenario(viewport, find_world()->get_scenario());
			VisualServer::get_singleton()->viewport_attach_canvas(viewport, current_canvas);

			_update_listener();
			_update_listener_2d();

			find_world_2d()->_register_viewport(this, Rect2());

			add_to_group("_viewports");
			if (get_tree()->is_debugging_collisions_hint()) {
				//2D
				Physics2DServer::get_singleton()->space_set_debug_contacts(find_world_2d()->get_space(), get_tree()->get_collision_debug_contact_count());
				contact_2d_debug = VisualServer::get_singleton()->canvas_item_create();
				VisualServer::get_singleton()->canvas_item_set_parent(contact_2d_debug, find_world_2d()->get_canvas());
				//3D
				PhysicsServer::get_singleton()->space_set_debug_contacts(find_world()->get_space(), get_tree()->get_collision_debug_contact_count());
				contact_3d_debug_multimesh = VisualServer::get_singleton()->multimesh_create();
				VisualServer::get_singleton()->multimesh_allocate(contact_3d_debug_multimesh, get_tree()->get_collision_debug_contact_count(), VS::MULTIMESH_TRANSFORM_3D, VS::MULTIMESH_COLOR_8BIT);
				VisualServer::get_singleton()->multimesh_set_visible_instances(contact_3d_debug_multimesh, 0);
				VisualServer::get_singleton()->multimesh_set_mesh(contact_3d_debug_multimesh, get_tree()->get_debug_contact_mesh()->get_rid());
				contact_3d_debug_instance = VisualServer::get_singleton()->instance_create();
				VisualServer::get_singleton()->instance_set_base(contact_3d_debug_instance, contact_3d_debug_multimesh);
				VisualServer::get_singleton()->instance_set_scenario(contact_3d_debug_instance, find_world()->get_scenario());
				//VisualServer::get_singleton()->instance_geometry_set_flag(contact_3d_debug_instance, VS::INSTANCE_FLAG_VISIBLE_IN_ALL_ROOMS, true);
			}

			VS::get_singleton()->viewport_set_active(viewport, true);
		} break;
		case NOTIFICATION_READY: {
#ifndef _3D_DISABLED
			if (listeners.size() && !listener) {
				Listener *first = NULL;
				for (Set<Listener *>::Element *E = listeners.front(); E; E = E->next()) {

					if (first == NULL || first->is_greater_than(E->get())) {
						first = E->get();
					}
				}

				if (first)
					first->make_current();
			}

			if (cameras.size() && !camera) {
				//there are cameras but no current camera, pick first in tree and make it current
				Camera *first = NULL;
				for (Set<Camera *>::Element *E = cameras.front(); E; E = E->next()) {

					if (first == NULL || first->is_greater_than(E->get())) {
						first = E->get();
					}
				}

				if (first)
					first->make_current();
			}
#endif

			// Enable processing for tooltips, collision debugging, physics object picking, etc.
			set_process_internal(true);
			set_physics_process_internal(true);

		} break;
		case NOTIFICATION_EXIT_TREE: {

			_gui_cancel_tooltip();
			if (world_2d.is_valid())
				world_2d->_remove_viewport(this);

			VisualServer::get_singleton()->viewport_set_scenario(viewport, RID());
			//			SpatialSoundServer::get_singleton()->listener_set_space(internal_listener, RID());
			VisualServer::get_singleton()->viewport_remove_canvas(viewport, current_canvas);
			if (contact_2d_debug.is_valid()) {
				VisualServer::get_singleton()->free(contact_2d_debug);
				contact_2d_debug = RID();
			}

			if (contact_3d_debug_multimesh.is_valid()) {
				VisualServer::get_singleton()->free(contact_3d_debug_multimesh);
				VisualServer::get_singleton()->free(contact_3d_debug_instance);
				contact_3d_debug_instance = RID();
				contact_3d_debug_multimesh = RID();
			}

			remove_from_group("_viewports");

			VS::get_singleton()->viewport_set_active(viewport, false);

		} break;
		case NOTIFICATION_INTERNAL_PROCESS: {

			if (gui.tooltip_timer >= 0) {
				gui.tooltip_timer -= get_process_delta_time();
				if (gui.tooltip_timer < 0) {
					_gui_show_tooltip();
				}
			}

		} break;
		case NOTIFICATION_INTERNAL_PHYSICS_PROCESS: {

			if (get_tree()->is_debugging_collisions_hint() && contact_2d_debug.is_valid()) {

				VisualServer::get_singleton()->canvas_item_clear(contact_2d_debug);
				VisualServer::get_singleton()->canvas_item_set_draw_index(contact_2d_debug, 0xFFFFF); //very high index

				Vector<Vector2> points = Physics2DServer::get_singleton()->space_get_contacts(find_world_2d()->get_space());
				int point_count = Physics2DServer::get_singleton()->space_get_contact_count(find_world_2d()->get_space());
				Color ccol = get_tree()->get_debug_collision_contact_color();

				for (int i = 0; i < point_count; i++) {

					VisualServer::get_singleton()->canvas_item_add_rect(contact_2d_debug, Rect2(points[i] - Vector2(2, 2), Vector2(5, 5)), ccol);
				}
			}

			if (get_tree()->is_debugging_collisions_hint() && contact_3d_debug_multimesh.is_valid()) {

				Vector<Vector3> points = PhysicsServer::get_singleton()->space_get_contacts(find_world()->get_space());
				int point_count = PhysicsServer::get_singleton()->space_get_contact_count(find_world()->get_space());

				VS::get_singleton()->multimesh_set_visible_instances(contact_3d_debug_multimesh, point_count);
			}

			if (physics_object_picking && (to_screen_rect == Rect2() || Input::get_singleton()->get_mouse_mode() != Input::MOUSE_MODE_CAPTURED)) {

#ifndef _3D_DISABLED
				Vector2 last_pos(1e20, 1e20);
				CollisionObject *last_object = NULL;
				ObjectID last_id = 0;
#endif
				PhysicsDirectSpaceState::RayResult result;
				Physics2DDirectSpaceState *ss2d = Physics2DServer::get_singleton()->space_get_direct_state(find_world_2d()->get_space());

				if (physics_has_last_mousepos) {
					// if no mouse event exists, create a motion one. This is necessary because objects or camera may have moved.
					// while this extra event is sent, it is checked if both camera and last object and last ID did not move. If nothing changed, the event is discarded to avoid flooding with unnecessary motion events every frame
					bool has_mouse_event = false;
					for (List<Ref<InputEvent> >::Element *E = physics_picking_events.front(); E; E = E->next()) {
						Ref<InputEventMouse> m = E->get();
						if (m.is_valid()) {
							has_mouse_event = true;
							break;
						}
					}

					if (!has_mouse_event) {
						Ref<InputEventMouseMotion> mm;
						mm.instance();
						mm->set_device(InputEvent::DEVICE_ID_INTERNAL);
						mm->set_global_position(physics_last_mousepos);
						mm->set_position(physics_last_mousepos);
						mm->set_alt(physics_last_mouse_state.alt);
						mm->set_shift(physics_last_mouse_state.shift);
						mm->set_control(physics_last_mouse_state.control);
						mm->set_metakey(physics_last_mouse_state.meta);
						mm->set_button_mask(physics_last_mouse_state.mouse_mask);
						physics_picking_events.push_back(mm);
					}
				}

				while (physics_picking_events.size()) {

					Ref<InputEvent> ev = physics_picking_events.front()->get();
					physics_picking_events.pop_front();

					Vector2 pos;
					bool is_mouse = false;

					Ref<InputEventMouseMotion> mm = ev;

					if (mm.is_valid()) {

						pos = mm->get_position();
						is_mouse = true;

						physics_has_last_mousepos = true;
						physics_last_mousepos = pos;
						physics_last_mouse_state.alt = mm->get_alt();
						physics_last_mouse_state.shift = mm->get_shift();
						physics_last_mouse_state.control = mm->get_control();
						physics_last_mouse_state.meta = mm->get_metakey();
						physics_last_mouse_state.mouse_mask = mm->get_button_mask();
					}

					Ref<InputEventMouseButton> mb = ev;

					if (mb.is_valid()) {

						pos = mb->get_position();
						is_mouse = true;

						physics_has_last_mousepos = true;
						physics_last_mousepos = pos;
						physics_last_mouse_state.alt = mb->get_alt();
						physics_last_mouse_state.shift = mb->get_shift();
						physics_last_mouse_state.control = mb->get_control();
						physics_last_mouse_state.meta = mb->get_metakey();

						if (mb->is_pressed()) {
							physics_last_mouse_state.mouse_mask |= (1 << (mb->get_button_index() - 1));
						} else {
							physics_last_mouse_state.mouse_mask &= ~(1 << (mb->get_button_index() - 1));

							// If touch mouse raised, assume we don't know last mouse pos until new events come
							if (mb->get_device() == InputEvent::DEVICE_ID_TOUCH_MOUSE) {
								physics_has_last_mousepos = false;
							}
						}
					}

					Ref<InputEventKey> k = ev;
					if (k.is_valid()) {
						//only for mask
						physics_last_mouse_state.alt = k->get_alt();
						physics_last_mouse_state.shift = k->get_shift();
						physics_last_mouse_state.control = k->get_control();
						physics_last_mouse_state.meta = k->get_metakey();
						continue;
					}

					Ref<InputEventScreenDrag> sd = ev;

					if (sd.is_valid()) {
						pos = sd->get_position();
					}

					Ref<InputEventScreenTouch> st = ev;

					if (st.is_valid()) {
						pos = st->get_position();
					}

					if (ss2d) {
						//send to 2D

						uint64_t frame = get_tree()->get_frame();

						Physics2DDirectSpaceState::ShapeResult res[64];
						for (Set<CanvasLayer *>::Element *E = canvas_layers.front(); E; E = E->next()) {
							Transform2D canvas_transform;
							ObjectID canvas_layer_id;
							if (E->get()) {
								// A descendant CanvasLayer
								canvas_transform = E->get()->get_transform();
								canvas_layer_id = E->get()->get_instance_id();
							} else {
								// This Viewport's builtin canvas
								canvas_transform = get_canvas_transform();
								canvas_layer_id = 0;
							}

							Vector2 point = canvas_transform.affine_inverse().xform(pos);

							int rc = ss2d->intersect_point_on_canvas(point, canvas_layer_id, res, 64, Set<RID>(), 0xFFFFFFFF, true, true, true);
							for (int i = 0; i < rc; i++) {

								if (res[i].collider_id && res[i].collider) {
									CollisionObject2D *co = Object::cast_to<CollisionObject2D>(res[i].collider);
									if (co) {
										bool send_event = true;
										if (is_mouse) {
											Map<ObjectID, uint64_t>::Element *F = physics_2d_mouseover.find(res[i].collider_id);

											if (!F) {
												F = physics_2d_mouseover.insert(res[i].collider_id, frame);
												co->_mouse_enter();
											} else {
												F->get() = frame;
												// It was already hovered, so don't send the event if it's faked
												if (mm.is_valid() && mm->get_device() == InputEvent::DEVICE_ID_INTERNAL) {
													send_event = false;
												}
											}
										}

										if (send_event) {
											co->_input_event(this, ev, res[i].shape);
										}
									}
								}
							}
						}

						if (is_mouse) {
							List<Map<ObjectID, uint64_t>::Element *> to_erase;

							for (Map<ObjectID, uint64_t>::Element *E = physics_2d_mouseover.front(); E; E = E->next()) {
								if (E->get() != frame) {
									Object *o = ObjectDB::get_instance(E->key());
									if (o) {

										CollisionObject2D *co = Object::cast_to<CollisionObject2D>(o);
										if (co) {
											co->_mouse_exit();
										}
									}
									to_erase.push_back(E);
								}
							}

							while (to_erase.size()) {
								physics_2d_mouseover.erase(to_erase.front()->get());
								to_erase.pop_front();
							}
						}
					}

#ifndef _3D_DISABLED
					bool captured = false;

					if (physics_object_capture != 0) {

						CollisionObject *co = Object::cast_to<CollisionObject>(ObjectDB::get_instance(physics_object_capture));
						if (co) {
							_collision_object_input_event(co, camera, ev, Vector3(), Vector3(), 0);
							captured = true;
							if (mb.is_valid() && mb->get_button_index() == 1 && !mb->is_pressed()) {
								physics_object_capture = 0;
							}

						} else {
							physics_object_capture = 0;
						}
					}

					if (captured) {
						//none
					} else if (pos == last_pos) {

						if (last_id) {
							if (ObjectDB::get_instance(last_id) && last_object) {
								//good, exists
								_collision_object_input_event(last_object, camera, ev, result.position, result.normal, result.shape);
								if (last_object->get_capture_input_on_drag() && mb.is_valid() && mb->get_button_index() == 1 && mb->is_pressed()) {
									physics_object_capture = last_id;
								}
							}
						}
					} else {

						if (camera) {

							Vector3 from = camera->project_ray_origin(pos);
							Vector3 dir = camera->project_ray_normal(pos);

							PhysicsDirectSpaceState *space = PhysicsServer::get_singleton()->space_get_direct_state(find_world()->get_space());
							if (space) {

								bool col = space->intersect_ray(from, from + dir * 10000, result, Set<RID>(), 0xFFFFFFFF, true, true, true);
								ObjectID new_collider = 0;
								if (col) {

									CollisionObject *co = Object::cast_to<CollisionObject>(result.collider);
									if (co) {

										_collision_object_input_event(co, camera, ev, result.position, result.normal, result.shape);
										last_object = co;
										last_id = result.collider_id;
										new_collider = last_id;
										if (co->get_capture_input_on_drag() && mb.is_valid() && mb->get_button_index() == 1 && mb->is_pressed()) {
											physics_object_capture = last_id;
										}
									}
								}

								if (is_mouse && new_collider != physics_object_over) {

									if (physics_object_over) {

										CollisionObject *co = Object::cast_to<CollisionObject>(ObjectDB::get_instance(physics_object_over));
										if (co) {
											co->_mouse_exit();
										}
									}

									if (new_collider) {

										CollisionObject *co = Object::cast_to<CollisionObject>(ObjectDB::get_instance(new_collider));
										if (co) {
											co->_mouse_enter();
										}
									}

									physics_object_over = new_collider;
								}
							}

							last_pos = pos;
						}
					}
#endif
				}
			}

		} break;
		case SceneTree::NOTIFICATION_WM_MOUSE_EXIT:
		case SceneTree::NOTIFICATION_WM_FOCUS_OUT: {

			_drop_physics_mouseover();

			if (gui.mouse_focus) {
				//if mouse is being pressed, send a release event
				_drop_mouse_focus();
			}
		} break;
	}
}

RID Viewport::get_viewport_rid() const {

	return viewport;
}

void Viewport::set_use_arvr(bool p_use_arvr) {
	arvr = p_use_arvr;

	VS::get_singleton()->viewport_set_use_arvr(viewport, arvr);
}

bool Viewport::use_arvr() {
	return arvr;
}

void Viewport::update_canvas_items() {
	if (!is_inside_tree())
		return;

	_update_canvas_items(this);
}

void Viewport::set_size(const Size2 &p_size) {

	if (size == p_size.floor())
		return;
	size = p_size.floor();
	VS::get_singleton()->viewport_set_size(viewport, size.width, size.height);

	_update_stretch_transform();

	emit_signal("size_changed");
}

Rect2 Viewport::get_visible_rect() const {

	Rect2 r;

	if (size == Size2()) {
		r = Rect2(Point2(), OS::get_singleton()->get_window_size());
	} else {
		r = Rect2(Point2(), size);
	}

	if (size_override) {
		r.size = size_override_size;
	}

	return r;
}

Size2 Viewport::get_size() const {

	return size;
}

void Viewport::_update_listener() {
	/*
	if (is_inside_tree() && audio_listener && (camera || listener) && (!get_parent() || (Object::cast_to<Control>(get_parent()) && Object::cast_to<Control>(get_parent())->is_visible_in_tree())))  {
		SpatialSoundServer::get_singleton()->listener_set_space(internal_listener, find_world()->get_sound_space());
	} else {
		SpatialSoundServer::get_singleton()->listener_set_space(internal_listener, RID());
	}
*/
}

void Viewport::_update_listener_2d() {

	/*
	if (is_inside_tree() && audio_listener && (!get_parent() || (Object::cast_to<Control>(get_parent()) && Object::cast_to<Control>(get_parent())->is_visible_in_tree())))
		SpatialSound2DServer::get_singleton()->listener_set_space(internal_listener_2d, find_world_2d()->get_sound_space());
	else
		SpatialSound2DServer::get_singleton()->listener_set_space(internal_listener_2d, RID());
*/
}

void Viewport::set_as_audio_listener(bool p_enable) {

	if (p_enable == audio_listener)
		return;

	audio_listener = p_enable;
	_update_listener();
}

bool Viewport::is_audio_listener() const {

	return audio_listener;
}

void Viewport::set_as_audio_listener_2d(bool p_enable) {

	if (p_enable == audio_listener_2d)
		return;

	audio_listener_2d = p_enable;

	_update_listener_2d();
}

bool Viewport::is_audio_listener_2d() const {

	return audio_listener_2d;
}

void Viewport::set_canvas_transform(const Transform2D &p_transform) {

	canvas_transform = p_transform;
	VisualServer::get_singleton()->viewport_set_canvas_transform(viewport, find_world_2d()->get_canvas(), canvas_transform);
}

Transform2D Viewport::get_canvas_transform() const {

	return canvas_transform;
}

void Viewport::_update_global_transform() {

	Transform2D sxform = stretch_transform * global_canvas_transform;

	VisualServer::get_singleton()->viewport_set_global_canvas_transform(viewport, sxform);
}

void Viewport::set_global_canvas_transform(const Transform2D &p_transform) {

	global_canvas_transform = p_transform;

	_update_global_transform();
}

Transform2D Viewport::get_global_canvas_transform() const {

	return global_canvas_transform;
}

void Viewport::_listener_transform_changed_notify() {

#ifndef _3D_DISABLED
//if (listener)
//		SpatialSoundServer::get_singleton()->listener_set_transform(internal_listener, listener->get_listener_transform());
#endif
}

void Viewport::_listener_set(Listener *p_listener) {

#ifndef _3D_DISABLED

	if (listener == p_listener)
		return;

	listener = p_listener;

	_update_listener();
	_listener_transform_changed_notify();
#endif
}

bool Viewport::_listener_add(Listener *p_listener) {

	listeners.insert(p_listener);
	return listeners.size() == 1;
}

void Viewport::_listener_remove(Listener *p_listener) {

	listeners.erase(p_listener);
	if (listener == p_listener) {
		listener = NULL;
	}
}

#ifndef _3D_DISABLED
void Viewport::_listener_make_next_current(Listener *p_exclude) {

	if (listeners.size() > 0) {
		for (Set<Listener *>::Element *E = listeners.front(); E; E = E->next()) {

			if (p_exclude == E->get())
				continue;
			if (!E->get()->is_inside_tree())
				continue;
			if (listener != NULL)
				return;

			E->get()->make_current();
		}
	} else {
		// Attempt to reset listener to the camera position
		if (camera != NULL) {
			_update_listener();
			_camera_transform_changed_notify();
		}
	}
}
#endif

void Viewport::_camera_transform_changed_notify() {

#ifndef _3D_DISABLED
// If there is an active listener in the scene, it takes priority over the camera
//	if (camera && !listener)
//		SpatialSoundServer::get_singleton()->listener_set_transform(internal_listener, camera->get_camera_transform());
#endif
}

void Viewport::_camera_set(Camera *p_camera) {

#ifndef _3D_DISABLED

	if (camera == p_camera)
		return;

	if (camera && find_world().is_valid()) {
		camera->notification(Camera::NOTIFICATION_LOST_CURRENT);
	}
	camera = p_camera;
	if (camera)
		VisualServer::get_singleton()->viewport_attach_camera(viewport, camera->get_camera());
	else
		VisualServer::get_singleton()->viewport_attach_camera(viewport, RID());

	if (camera && find_world().is_valid()) {
		camera->notification(Camera::NOTIFICATION_BECAME_CURRENT);
	}

	_update_listener();
	_camera_transform_changed_notify();
#endif
}

bool Viewport::_camera_add(Camera *p_camera) {

	cameras.insert(p_camera);
	return cameras.size() == 1;
}

void Viewport::_camera_remove(Camera *p_camera) {

	cameras.erase(p_camera);
	if (camera == p_camera) {
		if (camera && find_world().is_valid()) {
			camera->notification(Camera::NOTIFICATION_LOST_CURRENT);
		}
		camera = NULL;
	}
}

#ifndef _3D_DISABLED
void Viewport::_camera_make_next_current(Camera *p_exclude) {

	for (Set<Camera *>::Element *E = cameras.front(); E; E = E->next()) {

		if (p_exclude == E->get())
			continue;
		if (!E->get()->is_inside_tree())
			continue;
		if (camera != NULL)
			return;

		E->get()->make_current();
	}
}
#endif

void Viewport::_canvas_layer_add(CanvasLayer *p_canvas_layer) {

	canvas_layers.insert(p_canvas_layer);
}

void Viewport::_canvas_layer_remove(CanvasLayer *p_canvas_layer) {

	canvas_layers.erase(p_canvas_layer);
}

void Viewport::set_transparent_background(bool p_enable) {

	transparent_bg = p_enable;
	VS::get_singleton()->viewport_set_transparent_background(viewport, p_enable);
}

bool Viewport::has_transparent_background() const {

	return transparent_bg;
}

void Viewport::set_world_2d(const Ref<World2D> &p_world_2d) {
	if (world_2d == p_world_2d)
		return;

	if (parent && parent->find_world_2d() == p_world_2d) {
		WARN_PRINT("Unable to use parent world as world_2d");
		return;
	}

	if (is_inside_tree()) {
		find_world_2d()->_remove_viewport(this);
		VisualServer::get_singleton()->viewport_remove_canvas(viewport, current_canvas);
	}

	if (p_world_2d.is_valid())
		world_2d = p_world_2d;
	else {
		WARN_PRINT("Invalid world");
		world_2d = Ref<World2D>(memnew(World2D));
	}

	_update_listener_2d();

	if (is_inside_tree()) {
		current_canvas = find_world_2d()->get_canvas();
		VisualServer::get_singleton()->viewport_attach_canvas(viewport, current_canvas);
		find_world_2d()->_register_viewport(this, Rect2());
	}
}

Ref<World2D> Viewport::find_world_2d() const {

	if (world_2d.is_valid())
		return world_2d;
	else if (parent)
		return parent->find_world_2d();
	else
		return Ref<World2D>();
}

void Viewport::_propagate_enter_world(Node *p_node) {

	if (p_node != this) {

		if (!p_node->is_inside_tree()) //may not have entered scene yet
			return;

		if (Object::cast_to<Spatial>(p_node) || Object::cast_to<WorldEnvironment>(p_node)) {

			p_node->notification(Spatial::NOTIFICATION_ENTER_WORLD);
		} else {
			Viewport *v = Object::cast_to<Viewport>(p_node);
			if (v) {

				if (v->world.is_valid())
					return;
			}
		}
	}

	for (int i = 0; i < p_node->get_child_count(); i++) {

		_propagate_enter_world(p_node->get_child(i));
	}
}

void Viewport::_propagate_viewport_notification(Node *p_node, int p_what) {

	p_node->notification(p_what);
	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *c = p_node->get_child(i);
		if (Object::cast_to<Viewport>(c))
			continue;
		_propagate_viewport_notification(c, p_what);
	}
}

void Viewport::_propagate_exit_world(Node *p_node) {

	if (p_node != this) {

		if (!p_node->is_inside_tree()) //may have exited scene already
			return;

		if (Object::cast_to<Spatial>(p_node) || Object::cast_to<WorldEnvironment>(p_node)) {

			p_node->notification(Spatial::NOTIFICATION_EXIT_WORLD);
		} else {
			Viewport *v = Object::cast_to<Viewport>(p_node);
			if (v) {

				if (v->world.is_valid())
					return;
			}
		}
	}

	for (int i = 0; i < p_node->get_child_count(); i++) {

		_propagate_exit_world(p_node->get_child(i));
	}
}

void Viewport::set_world(const Ref<World> &p_world) {

	if (world == p_world)
		return;

	if (is_inside_tree())
		_propagate_exit_world(this);

#ifndef _3D_DISABLED
	if (find_world().is_valid() && camera)
		camera->notification(Camera::NOTIFICATION_LOST_CURRENT);
#endif

	world = p_world;

	if (is_inside_tree())
		_propagate_enter_world(this);

#ifndef _3D_DISABLED
	if (find_world().is_valid() && camera)
		camera->notification(Camera::NOTIFICATION_BECAME_CURRENT);
#endif

	//propagate exit

	if (is_inside_tree()) {
		VisualServer::get_singleton()->viewport_set_scenario(viewport, find_world()->get_scenario());
	}

	_update_listener();
}

Ref<World> Viewport::get_world() const {

	return world;
}

Ref<World2D> Viewport::get_world_2d() const {

	return world_2d;
}

Ref<World> Viewport::find_world() const {

	if (own_world.is_valid())
		return own_world;
	else if (world.is_valid())
		return world;
	else if (parent)
		return parent->find_world();
	else
		return Ref<World>();
}

Listener *Viewport::get_listener() const {

	return listener;
}

Camera *Viewport::get_camera() const {

	return camera;
}

Transform2D Viewport::get_final_transform() const {

	return stretch_transform * global_canvas_transform;
}

void Viewport::_update_canvas_items(Node *p_node) {
	if (p_node != this) {

		Viewport *vp = Object::cast_to<Viewport>(p_node);
		if (vp)
			return;

		CanvasItem *ci = Object::cast_to<CanvasItem>(p_node);
		if (ci) {
			ci->update();
		}
	}

	int cc = p_node->get_child_count();

	for (int i = 0; i < cc; i++) {
		_update_canvas_items(p_node->get_child(i));
	}
}

void Viewport::set_size_override(bool p_enable, const Size2 &p_size, const Vector2 &p_margin) {

	if (size_override == p_enable && p_size == size_override_size)
		return;

	size_override = p_enable;
	if (p_size.x >= 0 || p_size.y >= 0) {
		size_override_size = p_size;
	}
	size_override_margin = p_margin;

	_update_stretch_transform();
	emit_signal("size_changed");
}

Size2 Viewport::get_size_override() const {

	return size_override_size;
}
bool Viewport::is_size_override_enabled() const {

	return size_override;
}
void Viewport::set_size_override_stretch(bool p_enable) {

	if (p_enable == size_override_stretch)
		return;

	size_override_stretch = p_enable;

	_update_stretch_transform();
}

bool Viewport::is_size_override_stretch_enabled() const {

	return size_override_stretch;
}

void Viewport::set_update_mode(UpdateMode p_mode) {

	update_mode = p_mode;
	VS::get_singleton()->viewport_set_update_mode(viewport, VS::ViewportUpdateMode(p_mode));
}
Viewport::UpdateMode Viewport::get_update_mode() const {

	return update_mode;
}

Ref<ViewportTexture> Viewport::get_texture() const {

	return default_texture;
}

void Viewport::set_vflip(bool p_enable) {

	vflip = p_enable;
	VisualServer::get_singleton()->viewport_set_vflip(viewport, p_enable);
}

bool Viewport::get_vflip() const {

	return vflip;
}

void Viewport::set_clear_mode(ClearMode p_mode) {

	clear_mode = p_mode;
	VS::get_singleton()->viewport_set_clear_mode(viewport, VS::ViewportClearMode(p_mode));
}

Viewport::ClearMode Viewport::get_clear_mode() const {

	return clear_mode;
}

void Viewport::set_shadow_atlas_size(int p_size) {

	if (shadow_atlas_size == p_size)
		return;

	shadow_atlas_size = p_size;
	VS::get_singleton()->viewport_set_shadow_atlas_size(viewport, p_size);
}

int Viewport::get_shadow_atlas_size() const {

	return shadow_atlas_size;
}

void Viewport::set_shadow_atlas_quadrant_subdiv(int p_quadrant, ShadowAtlasQuadrantSubdiv p_subdiv) {

	ERR_FAIL_INDEX(p_quadrant, 4);
	ERR_FAIL_INDEX(p_subdiv, SHADOW_ATLAS_QUADRANT_SUBDIV_MAX);

	if (shadow_atlas_quadrant_subdiv[p_quadrant] == p_subdiv)
		return;

	shadow_atlas_quadrant_subdiv[p_quadrant] = p_subdiv;
	static const int subdiv[SHADOW_ATLAS_QUADRANT_SUBDIV_MAX] = { 0, 1, 4, 16, 64, 256, 1024 };

	VS::get_singleton()->viewport_set_shadow_atlas_quadrant_subdivision(viewport, p_quadrant, subdiv[p_subdiv]);
}
Viewport::ShadowAtlasQuadrantSubdiv Viewport::get_shadow_atlas_quadrant_subdiv(int p_quadrant) const {

	ERR_FAIL_INDEX_V(p_quadrant, 4, SHADOW_ATLAS_QUADRANT_SUBDIV_DISABLED);
	return shadow_atlas_quadrant_subdiv[p_quadrant];
}

Transform2D Viewport::_get_input_pre_xform() const {

	Transform2D pre_xf;

	if (to_screen_rect != Rect2()) {

		pre_xf.elements[2] = -to_screen_rect.position;
		pre_xf.scale(size / to_screen_rect.size);
	}

	return pre_xf;
}

Vector2 Viewport::_get_window_offset() const {

	if (get_parent() && get_parent()->has_method("get_global_position")) {
		return get_parent()->call("get_global_position");
	}
	return Vector2();
}

Ref<InputEvent> Viewport::_make_input_local(const Ref<InputEvent> &ev) {

	Vector2 vp_ofs = _get_window_offset();
	Transform2D ai = get_final_transform().affine_inverse() * _get_input_pre_xform();

	return ev->xformed_by(ai, -vp_ofs);
}

void Viewport::_vp_input_text(const String &p_text) {

	if (gui.key_focus) {
		gui.key_focus->call("set_text", p_text);
	}
}

void Viewport::_vp_input(const Ref<InputEvent> &p_ev) {

	if (disable_input)
		return;

#ifdef TOOLS_ENABLED
	if (Engine::get_singleton()->is_editor_hint() && get_tree()->get_edited_scene_root() && get_tree()->get_edited_scene_root()->is_a_parent_of(this)) {
		return;
	}
#endif

	if (to_screen_rect == Rect2())
		return; //if render target, can't get input events

	//this one handles system input, p_ev are in system coordinates
	//they are converted to viewport coordinates

	Ref<InputEvent> ev = _make_input_local(p_ev);
	input(ev);
}

void Viewport::_vp_unhandled_input(const Ref<InputEvent> &p_ev) {

	if (disable_input)
		return;
#ifdef TOOLS_ENABLED
	if (Engine::get_singleton()->is_editor_hint() && get_tree()->get_edited_scene_root() && get_tree()->get_edited_scene_root()->is_a_parent_of(this)) {
		return;
	}
#endif

	/*
	if (parent_control && !parent_control->is_visible_in_tree())
		return;
	*/

	if (to_screen_rect == Rect2())
		return; //if render target, can't get input events

	//this one handles system input, p_ev are in system coordinates
	//they are converted to viewport coordinates

	Ref<InputEvent> ev = _make_input_local(p_ev);
	unhandled_input(ev);
}

Vector2 Viewport::get_mouse_position() const {

	return (get_final_transform().affine_inverse() * _get_input_pre_xform()).xform(Input::get_singleton()->get_mouse_position() - _get_window_offset());
}

void Viewport::warp_mouse(const Vector2 &p_pos) {

	Vector2 gpos = (get_final_transform().affine_inverse() * _get_input_pre_xform()).affine_inverse().xform(p_pos);
	Input::get_singleton()->warp_mouse_position(gpos);
}

void Viewport::_gui_prepare_subwindows() {

	if (gui.subwindow_visibility_dirty) {

		gui.subwindows.clear();
		for (List<Control *>::Element *E = gui.all_known_subwindows.front(); E; E = E->next()) {
			if (E->get()->is_visible_in_tree()) {
				gui.subwindows.push_back(E->get());
			}
		}

		gui.subwindow_visibility_dirty = false;
		gui.subwindow_order_dirty = true;
	}

	_gui_sort_subwindows();
}

void Viewport::_gui_sort_subwindows() {

	if (!gui.subwindow_order_dirty)
		return;

	gui.modal_stack.sort_custom<Control::CComparator>();
	gui.subwindows.sort_custom<Control::CComparator>();

	gui.subwindow_order_dirty = false;
}

void Viewport::_gui_sort_modal_stack() {

	gui.modal_stack.sort_custom<Control::CComparator>();
}

void Viewport::_gui_sort_roots() {

	if (!gui.roots_order_dirty)
		return;

	gui.roots.sort_custom<Control::CComparator>();

	gui.roots_order_dirty = false;
}

void Viewport::_gui_cancel_tooltip() {

	gui.tooltip = NULL;
	gui.tooltip_timer = -1;
	if (gui.tooltip_popup) {
		gui.tooltip_popup->queue_delete();
		gui.tooltip_popup = NULL;
		gui.tooltip_label = NULL;
	}
}

String Viewport::_gui_get_tooltip(Control *p_control, const Vector2 &p_pos, Control **r_which) {

	Vector2 pos = p_pos;
	String tooltip;

	while (p_control) {

		tooltip = p_control->get_tooltip(pos);

		if (r_which) {
			*r_which = p_control;
		}

		if (tooltip != String())
			break;
		pos = p_control->get_transform().xform(pos);

		if (p_control->data.mouse_filter == Control::MOUSE_FILTER_STOP)
			break;
		if (p_control->is_set_as_toplevel())
			break;

		p_control = p_control->get_parent_control();
	}

	return tooltip;
}

void Viewport::_gui_show_tooltip() {

	if (!gui.tooltip) {
		return;
	}

	Control *which = NULL;
	String tooltip = _gui_get_tooltip(gui.tooltip, gui.tooltip->get_global_transform().xform_inv(gui.tooltip_pos), &which);
	if (tooltip.length() == 0)
		return; // bye

	if (gui.tooltip_popup) {
		memdelete(gui.tooltip_popup);
		gui.tooltip_popup = NULL;
		gui.tooltip_label = NULL;
	}

	if (!which) {
		return;
	}

	Control *rp = which; //->get_root_parent_control();
	if (!rp)
		return;

	gui.tooltip_popup = which->make_custom_tooltip(tooltip);

	if (!gui.tooltip_popup) {
		gui.tooltip_popup = memnew(TooltipPanel);

		gui.tooltip_label = memnew(TooltipLabel);
		gui.tooltip_popup->add_child(gui.tooltip_label);

		Ref<StyleBox> ttp = gui.tooltip_label->get_stylebox("panel", "TooltipPanel");

		gui.tooltip_label->set_anchor_and_margin(MARGIN_LEFT, Control::ANCHOR_BEGIN, ttp->get_margin(MARGIN_LEFT));
		gui.tooltip_label->set_anchor_and_margin(MARGIN_TOP, Control::ANCHOR_BEGIN, ttp->get_margin(MARGIN_TOP));
		gui.tooltip_label->set_anchor_and_margin(MARGIN_RIGHT, Control::ANCHOR_END, -ttp->get_margin(MARGIN_RIGHT));
		gui.tooltip_label->set_anchor_and_margin(MARGIN_BOTTOM, Control::ANCHOR_END, -ttp->get_margin(MARGIN_BOTTOM));
		gui.tooltip_label->set_text(tooltip.strip_edges());
	}

	rp->add_child(gui.tooltip_popup);
	gui.tooltip_popup->force_parent_owned();
	gui.tooltip_popup->set_as_toplevel(true);
	//gui.tooltip_popup->hide();

	Point2 tooltip_offset = ProjectSettings::get_singleton()->get("display/mouse_cursor/tooltip_position_offset");
	Rect2 r(gui.tooltip_pos + tooltip_offset, gui.tooltip_popup->get_minimum_size());
	Rect2 vr = gui.tooltip_popup->get_viewport_rect();
	if (r.size.x + r.position.x > vr.size.x)
		r.position.x = vr.size.x - r.size.x;
	else if (r.position.x < 0)
		r.position.x = 0;

	if (r.size.y + r.position.y > vr.size.y)
		r.position.y = vr.size.y - r.size.y;
	else if (r.position.y < 0)
		r.position.y = 0;

	gui.tooltip_popup->set_global_position(r.position);
	gui.tooltip_popup->set_size(r.size);

	gui.tooltip_popup->raise();
	gui.tooltip_popup->show();
}

void Viewport::_gui_call_input(Control *p_control, const Ref<InputEvent> &p_input) {

	//_block();

	Ref<InputEvent> ev = p_input;

	//mouse wheel events can't be stopped
	Ref<InputEventMouseButton> mb = p_input;

	bool cant_stop_me_now = (mb.is_valid() &&
							 (mb->get_button_index() == BUTTON_WHEEL_DOWN ||
									 mb->get_button_index() == BUTTON_WHEEL_UP ||
									 mb->get_button_index() == BUTTON_WHEEL_LEFT ||
									 mb->get_button_index() == BUTTON_WHEEL_RIGHT));
	Ref<InputEventPanGesture> pn = p_input;
	cant_stop_me_now = pn.is_valid() || cant_stop_me_now;

	bool ismouse = ev.is_valid() || Object::cast_to<InputEventMouseMotion>(*p_input) != NULL;

	CanvasItem *ci = p_control;
	while (ci) {

		Control *control = Object::cast_to<Control>(ci);
		if (control) {

			if (control->data.mouse_filter != Control::MOUSE_FILTER_IGNORE) {
				control->emit_signal(SceneStringNames::get_singleton()->gui_input, ev); //signal should be first, so it's possible to override an event (and then accept it)
			}
			if (gui.key_event_accepted)
				break;
			if (!control->is_inside_tree())
				break;

			if (control->data.mouse_filter != Control::MOUSE_FILTER_IGNORE) {
				control->call_multilevel(SceneStringNames::get_singleton()->_gui_input, ev);
			}

			if (!control->is_inside_tree() || control->is_set_as_toplevel())
				break;
			if (gui.key_event_accepted)
				break;
			if (!cant_stop_me_now && control->data.mouse_filter == Control::MOUSE_FILTER_STOP && ismouse)
				break;
		}

		if (ci->is_set_as_toplevel())
			break;

		ev = ev->xformed_by(ci->get_transform()); //transform event upwards
		ci = ci->get_parent_item();
	}

	//_unblock();
}

void Viewport::_gui_call_notification(Control *p_control, int p_what) {

	CanvasItem *ci = p_control;
	while (ci) {

		Control *control = Object::cast_to<Control>(ci);
		if (control) {

			if (control->data.mouse_filter != Control::MOUSE_FILTER_IGNORE) {
				control->notification(p_what);
			}

			if (!control->is_inside_tree())
				break;

			if (!control->is_inside_tree() || control->is_set_as_toplevel())
				break;
			if (control->data.mouse_filter == Control::MOUSE_FILTER_STOP)
				break;
		}

		if (ci->is_set_as_toplevel())
			break;

		ci = ci->get_parent_item();
	}

	//_unblock();
}
Control *Viewport::_gui_find_control(const Point2 &p_global) {

	_gui_prepare_subwindows();

	for (List<Control *>::Element *E = gui.subwindows.back(); E; E = E->prev()) {

		Control *sw = E->get();
		if (!sw->is_visible_in_tree())
			continue;

		Transform2D xform;
		CanvasItem *pci = sw->get_parent_item();
		if (pci)
			xform = pci->get_global_transform_with_canvas();
		else
			xform = sw->get_canvas_transform();

		Control *ret = _gui_find_control_at_pos(sw, p_global, xform, gui.focus_inv_xform);
		if (ret)
			return ret;
	}

	_gui_sort_roots();

	for (List<Control *>::Element *E = gui.roots.back(); E; E = E->prev()) {

		Control *sw = E->get();
		if (!sw->is_visible_in_tree())
			continue;

		Transform2D xform;
		CanvasItem *pci = sw->get_parent_item();
		if (pci)
			xform = pci->get_global_transform_with_canvas();
		else
			xform = sw->get_canvas_transform();

		Control *ret = _gui_find_control_at_pos(sw, p_global, xform, gui.focus_inv_xform);
		if (ret)
			return ret;
	}

	return NULL;
}

Control *Viewport::_gui_find_control_at_pos(CanvasItem *p_node, const Point2 &p_global, const Transform2D &p_xform, Transform2D &r_inv_xform) {

	if (Object::cast_to<Viewport>(p_node))
		return NULL;

	//subwindows first!!

	if (!p_node->is_visible()) {
		//return _find_next_visible_control_at_pos(p_node,p_global,r_inv_xform);
		return NULL; //canvas item hidden, discard
	}

	Transform2D matrix = p_xform * p_node->get_transform();
	// matrix.basis_determinant() == 0.0f implies that node does not exist on scene
	if (matrix.basis_determinant() == 0.0f)
		return NULL;

	Control *c = Object::cast_to<Control>(p_node);

	if (!c || !c->clips_input() || c->has_point(matrix.affine_inverse().xform(p_global))) {

		for (int i = p_node->get_child_count() - 1; i >= 0; i--) {

			if (p_node == gui.tooltip_popup)
				continue;

			CanvasItem *ci = Object::cast_to<CanvasItem>(p_node->get_child(i));
			if (!ci || ci->is_set_as_toplevel())
				continue;

			Control *ret = _gui_find_control_at_pos(ci, p_global, matrix, r_inv_xform);
			if (ret)
				return ret;
		}
	}

	if (!c)
		return NULL;

	matrix.affine_invert();

	//conditions for considering this as a valid control for return
	if (c->data.mouse_filter != Control::MOUSE_FILTER_IGNORE && c->has_point(matrix.xform(p_global)) && (!gui.drag_preview || (c != gui.drag_preview && !gui.drag_preview->is_a_parent_of(c)))) {
		r_inv_xform = matrix;
		return c;
	} else
		return NULL;
}

bool Viewport::_gui_drop(Control *p_at_control, Point2 p_at_pos, bool p_just_check) {

	{ //attempt grab, try parent controls too
		CanvasItem *ci = p_at_control;
		while (ci) {

			Control *control = Object::cast_to<Control>(ci);
			if (control) {

				if (control->can_drop_data(p_at_pos, gui.drag_data)) {
					if (!p_just_check) {
						control->drop_data(p_at_pos, gui.drag_data);
					}

					return true;
				}

				if (control->data.mouse_filter == Control::MOUSE_FILTER_STOP)
					break;
			}

			p_at_pos = ci->get_transform().xform(p_at_pos);

			if (ci->is_set_as_toplevel())
				break;

			ci = ci->get_parent_item();
		}
	}

	return false;
}

void Viewport::_gui_input_event(Ref<InputEvent> p_event) {

	//?
	/*
	if (!is_visible()) {
		return; //simple and plain
	}
	*/

	Ref<InputEventMouseButton> mb = p_event;

	if (mb.is_valid()) {

		gui.key_event_accepted = false;

		Point2 mpos = mb->get_position();
		if (mb->is_pressed()) {

			Size2 pos = mpos;
			if (gui.mouse_focus_mask) {

				//do not steal mouse focus and stuff while a focus mask exists
				gui.mouse_focus_mask |= 1 << (mb->get_button_index() - 1); //add the button to the mask
			} else {

				bool is_handled = false;

				_gui_sort_modal_stack();
				while (!gui.modal_stack.empty()) {

					Control *top = gui.modal_stack.back()->get();
					Vector2 pos2 = top->get_global_transform_with_canvas().affine_inverse().xform(mpos);
					if (!top->has_point(pos2)) {

						if (top->data.modal_exclusive || top->data.modal_frame == Engine::get_singleton()->get_frames_drawn()) {
							//cancel event, sorry, modal exclusive EATS UP ALL
							//alternative, you can't pop out a window the same frame it was made modal (fixes many issues)
							set_input_as_handled();

							return; // no one gets the event if exclusive NO ONE
						}

						top->notification(Control::NOTIFICATION_MODAL_CLOSE);
						top->_modal_stack_remove();
						top->hide();

						if (!top->pass_on_modal_close_click()) {
							is_handled = true;
						}
					} else {
						break;
					}
				}

				if (is_handled) {
					set_input_as_handled();
					return;
				}

				//Matrix32 parent_xform;

				/*
				if (data.parent_canvas_item)
					parent_xform=data.parent_canvas_item->get_global_transform();
				*/

				gui.mouse_focus = _gui_find_control(pos);
				gui.last_mouse_focus = gui.mouse_focus;

				if (!gui.mouse_focus) {
					gui.mouse_focus_mask = 0;
					return;
				}

				gui.mouse_focus_mask = 1 << (mb->get_button_index() - 1);

				if (mb->get_button_index() == BUTTON_LEFT) {
					gui.drag_accum = Vector2();
					gui.drag_attempted = false;
				}
			}

			mb = mb->xformed_by(Transform2D()); // make a copy of the event

			mb->set_global_position(pos);

			pos = gui.focus_inv_xform.xform(pos);

			mb->set_position(pos);

#ifdef DEBUG_ENABLED
			if (ScriptDebugger::get_singleton() && gui.mouse_focus) {

				Array arr;
				arr.push_back(gui.mouse_focus->get_path());
				arr.push_back(gui.mouse_focus->get_class());
				ScriptDebugger::get_singleton()->send_message("click_ctrl", arr);
			}
#endif

			if (mb->get_button_index() == BUTTON_LEFT) { //assign focus
				CanvasItem *ci = gui.mouse_focus;
				while (ci) {

					Control *control = Object::cast_to<Control>(ci);
					if (control) {
						if (control->get_focus_mode() != Control::FOCUS_NONE) {
							if (control != gui.key_focus) {
								control->grab_focus();
							}
							break;
						}

						if (control->data.mouse_filter == Control::MOUSE_FILTER_STOP)
							break;
					}

					if (ci->is_set_as_toplevel())
						break;

					ci = ci->get_parent_item();
				}
			}

			if (gui.mouse_focus && gui.mouse_focus->can_process()) {
				_gui_call_input(gui.mouse_focus, mb);
			}

			set_input_as_handled();

			if (gui.drag_data.get_type() != Variant::NIL && mb->get_button_index() == BUTTON_LEFT) {

				//alternate drop use (when using force_drag(), as proposed by #5342
				if (gui.mouse_focus) {
					_gui_drop(gui.mouse_focus, pos, false);
				}

				gui.drag_data = Variant();
				gui.dragging = false;

				if (gui.drag_preview) {
					memdelete(gui.drag_preview);
					gui.drag_preview = NULL;
				}
				_propagate_viewport_notification(this, NOTIFICATION_DRAG_END);
				//change mouse accordingly
			}

			_gui_cancel_tooltip();
			//gui.tooltip_popup->hide();

		} else {

			if (gui.drag_data.get_type() != Variant::NIL && mb->get_button_index() == BUTTON_LEFT) {

				if (gui.mouse_over) {
					Size2 pos = mpos;
					pos = gui.focus_inv_xform.xform(pos);

					_gui_drop(gui.mouse_over, pos, false);
				}

				if (gui.drag_preview && mb->get_button_index() == BUTTON_LEFT) {
					memdelete(gui.drag_preview);
					gui.drag_preview = NULL;
				}

				gui.drag_data = Variant();
				gui.dragging = false;
				_propagate_viewport_notification(this, NOTIFICATION_DRAG_END);
				//change mouse accordingly
			}

			gui.mouse_focus_mask &= ~(1 << (mb->get_button_index() - 1)); //remove from mask

			if (!gui.mouse_focus) {
				//release event is only sent if a mouse focus (previously pressed button) exists
				return;
			}

			Size2 pos = mpos;

			mb = mb->xformed_by(Transform2D()); //make a copy
			mb->set_global_position(pos);
			pos = gui.focus_inv_xform.xform(pos);
			mb->set_position(pos);

			Control *mouse_focus = gui.mouse_focus;

			//disable mouse focus if needed before calling input, this makes popups on mouse press event work better, as the release will never be received otherwise
			if (gui.mouse_focus_mask == 0) {
				gui.mouse_focus = NULL;
			}

			if (mouse_focus && mouse_focus->can_process()) {
				_gui_call_input(mouse_focus, mb);
			}

			/*if (gui.drag_data.get_type()!=Variant::NIL && mb->get_button_index()==BUTTON_LEFT) {
				_propagate_viewport_notification(this,NOTIFICATION_DRAG_END);
				gui.drag_data=Variant(); //always clear
			}*/

			set_input_as_handled();
		}
	}

	Ref<InputEventMouseMotion> mm = p_event;

	if (mm.is_valid()) {

		gui.key_event_accepted = false;
		Point2 mpos = mm->get_position();

		gui.last_mouse_pos = mpos;

		Control *over = NULL;

		// D&D
		if (!gui.drag_attempted && gui.mouse_focus && mm->get_button_mask() & BUTTON_MASK_LEFT) {

			gui.drag_accum += mm->get_relative();
			float len = gui.drag_accum.length();
			if (len > 10) {

				{ //attempt grab, try parent controls too
					CanvasItem *ci = gui.mouse_focus;
					while (ci) {

						Control *control = Object::cast_to<Control>(ci);
						if (control) {

							gui.dragging = true;
							gui.drag_data = control->get_drag_data(control->get_global_transform_with_canvas().affine_inverse().xform(mpos) - gui.drag_accum);
							if (gui.drag_data.get_type() != Variant::NIL) {

								gui.mouse_focus = NULL;
								gui.mouse_focus_mask = 0;
								break;
							} else {
								if (gui.drag_preview != NULL) {
									ERR_PRINT("Don't set a drag preview and return null data. Preview was deleted and drag request ignored.");
									memdelete(gui.drag_preview);
									gui.drag_preview = NULL;
								}
								gui.dragging = false;
							}

							if (control->data.mouse_filter == Control::MOUSE_FILTER_STOP)
								break;
						}

						if (ci->is_set_as_toplevel())
							break;

						ci = ci->get_parent_item();
					}
				}

				gui.drag_attempted = true;
				if (gui.drag_data.get_type() != Variant::NIL) {

					_propagate_viewport_notification(this, NOTIFICATION_DRAG_BEGIN);
				}
			}
		}

		if (gui.mouse_focus) {
			over = gui.mouse_focus;
			//recompute focus_inv_xform again here

		} else {

			over = _gui_find_control(mpos);
		}

		if (gui.drag_data.get_type() == Variant::NIL && over && !gui.modal_stack.empty()) {

			Control *top = gui.modal_stack.back()->get();

			if (over != top && !top->is_a_parent_of(over)) {

				PopupMenu *popup_menu = Object::cast_to<PopupMenu>(top);
				MenuButton *popup_menu_parent = NULL;
				MenuButton *menu_button = Object::cast_to<MenuButton>(over);

				if (popup_menu) {
					popup_menu_parent = Object::cast_to<MenuButton>(popup_menu->get_parent());
					if (!popup_menu_parent) {
						// Go through the parents to see if there's a MenuButton at the end.
						while (Object::cast_to<PopupMenu>(popup_menu->get_parent())) {
							popup_menu = Object::cast_to<PopupMenu>(popup_menu->get_parent());
						}
						popup_menu_parent = Object::cast_to<MenuButton>(popup_menu->get_parent());
					}
				}

				// If the mouse is over a menu button, this menu will open automatically
				// if there is already a pop-up menu open at the same hierarchical level.
				if (popup_menu_parent && menu_button && popup_menu_parent->is_switch_on_hover() &&
						!menu_button->is_disabled() && menu_button->is_switch_on_hover() &&
						(popup_menu_parent->get_parent()->is_a_parent_of(menu_button) ||
								menu_button->get_parent()->is_a_parent_of(popup_menu))) {

					popup_menu->notification(Control::NOTIFICATION_MODAL_CLOSE);
					popup_menu->_modal_stack_remove();
					popup_menu->hide();

					menu_button->pressed();
				} else {
					over = NULL; //nothing can be found outside the modal stack
				}
			}
		}

		if (over != gui.mouse_over) {

			if (gui.mouse_over) {
				_gui_call_notification(gui.mouse_over, Control::NOTIFICATION_MOUSE_EXIT);
			}

			_gui_cancel_tooltip();

			if (over) {
				_gui_call_notification(over, Control::NOTIFICATION_MOUSE_ENTER);
			}
		}

		gui.mouse_over = over;

		if (gui.drag_preview) {
			gui.drag_preview->set_position(mpos);
		}

		if (!over) {
			OS::get_singleton()->set_cursor_shape((OS::CursorShape)Input::get_singleton()->get_default_cursor_shape());
			return;
		}

		Transform2D localizer = over->get_global_transform_with_canvas().affine_inverse();
		Size2 pos = localizer.xform(mpos);
		Vector2 speed = localizer.basis_xform(mm->get_speed());
		Vector2 rel = localizer.basis_xform(mm->get_relative());

		mm = mm->xformed_by(Transform2D()); //make a copy

		mm->set_global_position(mpos);
		mm->set_speed(speed);
		mm->set_relative(rel);

		if (mm->get_button_mask() == 0) {
			//nothing pressed

			bool can_tooltip = true;

			if (!gui.modal_stack.empty()) {
				if (gui.modal_stack.back()->get() != over && !gui.modal_stack.back()->get()->is_a_parent_of(over))
					can_tooltip = false;
			}

			bool is_tooltip_shown = false;

			if (gui.tooltip_popup) {
				if (can_tooltip && gui.tooltip) {
					String tooltip = _gui_get_tooltip(over, gui.tooltip->get_global_transform().xform_inv(mpos));

					if (tooltip.length() == 0)
						_gui_cancel_tooltip();
					else if (gui.tooltip_label) {
						if (tooltip == gui.tooltip_label->get_text()) {
							is_tooltip_shown = true;
						}
					} else if (tooltip == String(gui.tooltip_popup->call("get_tooltip_text"))) {
						is_tooltip_shown = true;
					}
				} else
					_gui_cancel_tooltip();
			}

			if (can_tooltip && !is_tooltip_shown) {

				gui.tooltip = over;
				gui.tooltip_pos = mpos; //(parent_xform * get_transform()).affine_inverse().xform(pos);
				gui.tooltip_timer = gui.tooltip_delay;
			}
		}

		//pos = gui.focus_inv_xform.xform(pos);

		mm->set_position(pos);

		Control::CursorShape cursor_shape = Control::CURSOR_ARROW;
		{
			Control *c = over;
			Vector2 cpos = pos;
			while (c) {
				cursor_shape = c->get_cursor_shape(cpos);
				cpos = c->get_transform().xform(cpos);
				if (cursor_shape != Control::CURSOR_ARROW)
					break;
				if (c->data.mouse_filter == Control::MOUSE_FILTER_STOP)
					break;
				if (c->is_set_as_toplevel())
					break;
				c = c->get_parent_control();
			}
		}

		OS::get_singleton()->set_cursor_shape((OS::CursorShape)cursor_shape);

		if (over && over->can_process()) {
			_gui_call_input(over, mm);
		}

		set_input_as_handled();

		if (gui.drag_data.get_type() != Variant::NIL && mm->get_button_mask() & BUTTON_MASK_LEFT) {

			bool can_drop = _gui_drop(over, pos, true);

			if (!can_drop) {
				OS::get_singleton()->set_cursor_shape(OS::CURSOR_FORBIDDEN);
			} else {
				OS::get_singleton()->set_cursor_shape(OS::CURSOR_CAN_DROP);
			}
			//change mouse accordingly i guess
		}
	}

	Ref<InputEventScreenTouch> touch_event = p_event;
	if (touch_event.is_valid()) {

		Size2 pos = touch_event->get_position();
		if (touch_event->is_pressed()) {

			Control *over = _gui_find_control(pos);
			if (over) {

				if (!gui.modal_stack.empty()) {

					Control *top = gui.modal_stack.back()->get();
					if (over != top && !top->is_a_parent_of(over)) {

						return;
					}
				}
				if (over->can_process()) {

					touch_event = touch_event->xformed_by(Transform2D()); //make a copy
					if (over == gui.mouse_focus) {
						pos = gui.focus_inv_xform.xform(pos);
					} else {
						pos = over->get_global_transform_with_canvas().affine_inverse().xform(pos);
					}
					touch_event->set_position(pos);
					_gui_call_input(over, touch_event);
				}
				set_input_as_handled();
				return;
			}
		} else if (touch_event->get_index() == 0 && gui.last_mouse_focus) {

			if (gui.last_mouse_focus->can_process()) {

				touch_event = touch_event->xformed_by(Transform2D()); //make a copy
				touch_event->set_position(gui.focus_inv_xform.xform(pos));

				_gui_call_input(gui.last_mouse_focus, touch_event);
			}
			set_input_as_handled();
			return;
		}
	}

	Ref<InputEventGesture> gesture_event = p_event;
	if (gesture_event.is_valid()) {

		gui.key_event_accepted = false;

		_gui_cancel_tooltip();

		Size2 pos = gesture_event->get_position();

		Control *over = _gui_find_control(pos);
		if (over) {

			if (over->can_process()) {

				gesture_event = gesture_event->xformed_by(Transform2D()); //make a copy
				if (over == gui.mouse_focus) {
					pos = gui.focus_inv_xform.xform(pos);
				} else {
					pos = over->get_global_transform_with_canvas().affine_inverse().xform(pos);
				}
				gesture_event->set_position(pos);
				_gui_call_input(over, gesture_event);
			}
			set_input_as_handled();
			return;
		}
	}

	Ref<InputEventScreenDrag> drag_event = p_event;
	if (drag_event.is_valid()) {

		Control *over = gui.mouse_focus;
		if (!over) {
			over = _gui_find_control(drag_event->get_position());
		}
		if (over) {

			if (!gui.modal_stack.empty()) {

				Control *top = gui.modal_stack.back()->get();
				if (over != top && !top->is_a_parent_of(over)) {

					return;
				}
			}
			if (over->can_process()) {

				Transform2D localizer = over->get_global_transform_with_canvas().affine_inverse();
				Size2 pos = localizer.xform(drag_event->get_position());
				Vector2 speed = localizer.basis_xform(drag_event->get_speed());
				Vector2 rel = localizer.basis_xform(drag_event->get_relative());

				drag_event = drag_event->xformed_by(Transform2D()); //make a copy

				drag_event->set_speed(speed);
				drag_event->set_relative(rel);
				drag_event->set_position(pos);

				_gui_call_input(over, drag_event);
			}

			set_input_as_handled();
			return;
		}
	}

	if (mm.is_null() && mb.is_null() && p_event->is_action_type()) {

		if (gui.key_focus && !gui.key_focus->is_visible_in_tree()) {
			gui.key_focus->release_focus();
		}

		if (gui.key_focus) {

			gui.key_event_accepted = false;
			if (gui.key_focus->can_process()) {
				gui.key_focus->call_multilevel(SceneStringNames::get_singleton()->_gui_input, p_event);
				if (gui.key_focus) //maybe lost it
					gui.key_focus->emit_signal(SceneStringNames::get_singleton()->gui_input, p_event);
			}

			if (gui.key_event_accepted) {

				set_input_as_handled();
				return;
			}
		}

		if (p_event->is_pressed() && p_event->is_action("ui_cancel") && !gui.modal_stack.empty()) {

			_gui_sort_modal_stack();
			Control *top = gui.modal_stack.back()->get();
			if (!top->data.modal_exclusive) {

				top->notification(Control::NOTIFICATION_MODAL_CLOSE);
				top->_modal_stack_remove();
				top->hide();
				// Close modal, set input as handled
				set_input_as_handled();
				return;
			}
		}

		Control *from = gui.key_focus ? gui.key_focus : NULL; //hmm

		//keyboard focus
		//if (from && p_event->is_pressed() && !p_event->get_alt() && !p_event->get_metakey() && !p_event->key->get_command()) {

		Ref<InputEventKey> k = p_event;
		//need to check for mods, otherwise any combination of alt/ctrl/shift+<up/down/left/righ/etc> is handled here when it shouldn't be.
		bool mods = k.is_valid() && (k->get_control() || k->get_alt() || k->get_shift() || k->get_metakey());

		if (from && p_event->is_pressed()) {
			Control *next = NULL;

			if (p_event->is_action_pressed("ui_focus_next")) {

				next = from->find_next_valid_focus();
			}

			if (p_event->is_action_pressed("ui_focus_prev")) {

				next = from->find_prev_valid_focus();
			}

			if (!mods && p_event->is_action_pressed("ui_up")) {

				next = from->_get_focus_neighbour(MARGIN_TOP);
			}

			if (!mods && p_event->is_action_pressed("ui_left")) {

				next = from->_get_focus_neighbour(MARGIN_LEFT);
			}

			if (!mods && p_event->is_action_pressed("ui_right")) {

				next = from->_get_focus_neighbour(MARGIN_RIGHT);
			}

			if (!mods && p_event->is_action_pressed("ui_down")) {

				next = from->_get_focus_neighbour(MARGIN_BOTTOM);
			}

			if (next) {
				next->grab_focus();
				set_input_as_handled();
			}
		}
	}
}

List<Control *>::Element *Viewport::_gui_add_root_control(Control *p_control) {

	gui.roots_order_dirty = true;
	return gui.roots.push_back(p_control);
}

List<Control *>::Element *Viewport::_gui_add_subwindow_control(Control *p_control) {

	p_control->connect("visibility_changed", this, "_subwindow_visibility_changed");

	if (p_control->is_visible_in_tree()) {
		gui.subwindow_order_dirty = true;
		gui.subwindows.push_back(p_control);
	}

	return gui.all_known_subwindows.push_back(p_control);
}

void Viewport::_gui_set_subwindow_order_dirty() {
	gui.subwindow_order_dirty = true;
}

void Viewport::_gui_set_root_order_dirty() {
	gui.roots_order_dirty = true;
}

void Viewport::_gui_remove_modal_control(List<Control *>::Element *MI) {

	gui.modal_stack.erase(MI);
}

void Viewport::_gui_remove_from_modal_stack(List<Control *>::Element *MI, ObjectID p_prev_focus_owner) {

	//transfer the focus stack to the next

	List<Control *>::Element *next = MI->next();

	gui.modal_stack.erase(MI);
	MI = NULL;

	if (p_prev_focus_owner) {

		// for previous window in stack, pass the focus so it feels more
		// natural

		if (!next) { //top of stack

			Object *pfo = ObjectDB::get_instance(p_prev_focus_owner);
			Control *pfoc = Object::cast_to<Control>(pfo);
			if (!pfoc)
				return;

			if (!pfoc->is_inside_tree() || !pfoc->is_visible_in_tree())
				return;
			pfoc->grab_focus();
		} else {

			next->get()->_modal_set_prev_focus_owner(p_prev_focus_owner);
		}
	}
}

void Viewport::_gui_force_drag(Control *p_base, const Variant &p_data, Control *p_control) {

	ERR_EXPLAIN("Drag data must be a value");
	ERR_FAIL_COND(p_data.get_type() == Variant::NIL);

	gui.dragging = true;
	gui.drag_data = p_data;
	gui.mouse_focus = NULL;

	if (p_control) {
		_gui_set_drag_preview(p_base, p_control);
	}
}

void Viewport::_gui_set_drag_preview(Control *p_base, Control *p_control) {

	ERR_FAIL_NULL(p_control);
	ERR_FAIL_COND(!Object::cast_to<Control>((Object *)p_control));
	ERR_FAIL_COND(p_control->is_inside_tree());
	ERR_FAIL_COND(p_control->get_parent() != NULL);

	if (gui.drag_preview) {
		memdelete(gui.drag_preview);
	}
	p_control->set_as_toplevel(true);
	p_control->set_position(gui.last_mouse_pos);
	p_base->get_root_parent_control()->add_child(p_control); //add as child of viewport
	p_control->raise();

	gui.drag_preview = p_control;
}

void Viewport::_gui_remove_root_control(List<Control *>::Element *RI) {

	gui.roots.erase(RI);
}

void Viewport::_gui_remove_subwindow_control(List<Control *>::Element *SI) {

	ERR_FAIL_COND(!SI);

	Control *control = SI->get();

	control->disconnect("visibility_changed", this, "_subwindow_visibility_changed");

	List<Control *>::Element *E = gui.subwindows.find(control);
	if (E)
		gui.subwindows.erase(E);

	gui.all_known_subwindows.erase(SI);
}

void Viewport::_gui_unfocus_control(Control *p_control) {

	if (gui.key_focus == p_control) {
		gui.key_focus->release_focus();
	}
}

void Viewport::_gui_hid_control(Control *p_control) {

	if (gui.mouse_focus == p_control) {
		_drop_mouse_focus();
	}

	/* ???
	if (data.window==p_control) {
		window->drag_data=Variant();
		if (window->drag_preview) {
			memdelete( window->drag_preview);
			window->drag_preview=NULL;
		}
	}
	*/

	if (gui.key_focus == p_control)
		_gui_remove_focus();
	if (gui.mouse_over == p_control)
		gui.mouse_over = NULL;
	if (gui.tooltip == p_control)
		_gui_cancel_tooltip();
}

void Viewport::_gui_remove_control(Control *p_control) {

	if (gui.mouse_focus == p_control) {
		gui.mouse_focus = NULL;
		gui.mouse_focus_mask = 0;
	}
	if (gui.last_mouse_focus == p_control) {
		gui.last_mouse_focus = NULL;
	}
	if (gui.key_focus == p_control)
		gui.key_focus = NULL;
	if (gui.mouse_over == p_control)
		gui.mouse_over = NULL;
	if (gui.tooltip == p_control)
		gui.tooltip = NULL;
	if (gui.tooltip_popup == p_control) {
		_gui_cancel_tooltip();
	}
}

void Viewport::_gui_remove_focus() {

	if (gui.key_focus) {
		Node *f = gui.key_focus;
		gui.key_focus = NULL;
		f->notification(Control::NOTIFICATION_FOCUS_EXIT, true);
	}
}

bool Viewport::_gui_is_modal_on_top(const Control *p_control) {

	return (gui.modal_stack.size() && gui.modal_stack.back()->get() == p_control);
}

bool Viewport::_gui_control_has_focus(const Control *p_control) {

	return gui.key_focus == p_control;
}

void Viewport::_gui_control_grab_focus(Control *p_control) {

	//no need for change
	if (gui.key_focus && gui.key_focus == p_control)
		return;
	get_tree()->call_group_flags(SceneTree::GROUP_CALL_REALTIME, "_viewports", "_gui_remove_focus");
	gui.key_focus = p_control;
	p_control->notification(Control::NOTIFICATION_FOCUS_ENTER);
	p_control->update();
}

void Viewport::_gui_accept_event() {

	gui.key_event_accepted = true;
	if (is_inside_tree())
		set_input_as_handled();
}

void Viewport::_drop_mouse_focus() {

	Control *c = gui.mouse_focus;
	int mask = gui.mouse_focus_mask;
	gui.mouse_focus = NULL;
	gui.mouse_focus_mask = 0;

	for (int i = 0; i < 3; i++) {

		if (mask & (1 << i)) {
			Ref<InputEventMouseButton> mb;
			mb.instance();
			mb->set_position(c->get_local_mouse_position());
			mb->set_global_position(c->get_local_mouse_position());
			mb->set_button_index(i + 1);
			mb->set_pressed(false);
			c->call_multilevel(SceneStringNames::get_singleton()->_gui_input, mb);
		}
	}
}

void Viewport::_drop_physics_mouseover() {

	physics_has_last_mousepos = false;

	while (physics_2d_mouseover.size()) {
		Object *o = ObjectDB::get_instance(physics_2d_mouseover.front()->key());
		if (o) {
			CollisionObject2D *co = Object::cast_to<CollisionObject2D>(o);
			co->_mouse_exit();
		}
		physics_2d_mouseover.erase(physics_2d_mouseover.front());
	}

#ifndef _3D_DISABLED
	if (physics_object_over) {
		CollisionObject *co = Object::cast_to<CollisionObject>(ObjectDB::get_instance(physics_object_over));
		if (co) {
			co->_mouse_exit();
		}
	}

	physics_object_over = physics_object_capture = 0;
#endif
}

List<Control *>::Element *Viewport::_gui_show_modal(Control *p_control) {

	gui.modal_stack.push_back(p_control);
	if (gui.key_focus)
		p_control->_modal_set_prev_focus_owner(gui.key_focus->get_instance_id());
	else
		p_control->_modal_set_prev_focus_owner(0);

	if (gui.mouse_focus && !p_control->is_a_parent_of(gui.mouse_focus) && !gui.mouse_click_grabber) {

		_drop_mouse_focus();
	}

	return gui.modal_stack.back();
}

Control *Viewport::_gui_get_focus_owner() {

	return gui.key_focus;
}

void Viewport::_gui_grab_click_focus(Control *p_control) {

	gui.mouse_click_grabber = p_control;
	call_deferred("_post_gui_grab_click_focus");
}

void Viewport::_post_gui_grab_click_focus() {

	Control *focus_grabber = gui.mouse_click_grabber;
	if (!focus_grabber) {
		// Redundant grab requests were made
		return;
	}
	gui.mouse_click_grabber = NULL;

	if (gui.mouse_focus) {

		if (gui.mouse_focus == focus_grabber)
			return;

		int mask = gui.mouse_focus_mask;
		Point2 click = gui.mouse_focus->get_global_transform_with_canvas().affine_inverse().xform(gui.last_mouse_pos);

		for (int i = 0; i < 3; i++) {

			if (mask & (1 << i)) {

				Ref<InputEventMouseButton> mb;
				mb.instance();

				//send unclic

				mb->set_position(click);
				mb->set_button_index(i + 1);
				mb->set_pressed(false);
				gui.mouse_focus->call_multilevel(SceneStringNames::get_singleton()->_gui_input, mb);
			}
		}

		gui.mouse_focus = focus_grabber;
		gui.focus_inv_xform = gui.mouse_focus->get_global_transform_with_canvas().affine_inverse();
		click = gui.mouse_focus->get_global_transform_with_canvas().affine_inverse().xform(gui.last_mouse_pos);

		for (int i = 0; i < 3; i++) {

			if (mask & (1 << i)) {

				Ref<InputEventMouseButton> mb;
				mb.instance();

				//send clic

				mb->set_position(click);
				mb->set_button_index(i + 1);
				mb->set_pressed(true);
				gui.mouse_focus->call_deferred(SceneStringNames::get_singleton()->_gui_input, mb);
			}
		}
	}
}

///////////////////////////////

void Viewport::input(const Ref<InputEvent> &p_event) {

	ERR_FAIL_COND(!is_inside_tree());

	local_input_handled = false;

	if (!is_input_handled()) {
		get_tree()->_call_input_pause(input_group, "_input", p_event); //not a bug, must happen before GUI, order is _input -> gui input -> _unhandled input
	}

	if (!is_input_handled()) {
		_gui_input_event(p_event);
	}
	//get_tree()->call_group(SceneTree::GROUP_CALL_REVERSE|SceneTree::GROUP_CALL_REALTIME|SceneTree::GROUP_CALL_MULIILEVEL,gui_input_group,"_gui_input",p_event); //special one for GUI, as controls use their own process check
}

void Viewport::unhandled_input(const Ref<InputEvent> &p_event) {

	ERR_FAIL_COND(!is_inside_tree());

	get_tree()->_call_input_pause(unhandled_input_group, "_unhandled_input", p_event);
	//call_group(GROUP_CALL_REVERSE|GROUP_CALL_REALTIME|GROUP_CALL_MULIILEVEL,"unhandled_input","_unhandled_input",ev);
	if (!get_tree()->input_handled && Object::cast_to<InputEventKey>(*p_event) != NULL) {
		get_tree()->_call_input_pause(unhandled_key_input_group, "_unhandled_key_input", p_event);
		//call_group(GROUP_CALL_REVERSE|GROUP_CALL_REALTIME|GROUP_CALL_MULIILEVEL,"unhandled_key_input","_unhandled_key_input",ev);
	}

	if (physics_object_picking && !get_tree()->input_handled) {

		if (Input::get_singleton()->get_mouse_mode() != Input::MOUSE_MODE_CAPTURED &&
				(Object::cast_to<InputEventMouseButton>(*p_event) ||
						Object::cast_to<InputEventMouseMotion>(*p_event) ||
						Object::cast_to<InputEventScreenDrag>(*p_event) ||
						Object::cast_to<InputEventScreenTouch>(*p_event) ||
						Object::cast_to<InputEventKey>(*p_event) //to remember state

						)) {
			physics_picking_events.push_back(p_event);
		}
	}
}

void Viewport::set_use_own_world(bool p_world) {

	if (p_world == own_world.is_valid())
		return;

	if (is_inside_tree())
		_propagate_exit_world(this);

#ifndef _3D_DISABLED
	if (find_world().is_valid() && camera)
		camera->notification(Camera::NOTIFICATION_LOST_CURRENT);
#endif

	if (!p_world)
		own_world = Ref<World>();
	else
		own_world = Ref<World>(memnew(World));

	if (is_inside_tree())
		_propagate_enter_world(this);

#ifndef _3D_DISABLED
	if (find_world().is_valid() && camera)
		camera->notification(Camera::NOTIFICATION_BECAME_CURRENT);
#endif

	//propagate exit

	if (is_inside_tree()) {
		VisualServer::get_singleton()->viewport_set_scenario(viewport, find_world()->get_scenario());
	}

	_update_listener();
}

bool Viewport::is_using_own_world() const {

	return own_world.is_valid();
}

void Viewport::set_attach_to_screen_rect(const Rect2 &p_rect) {

	VS::get_singleton()->viewport_attach_to_screen(viewport, p_rect);
	to_screen_rect = p_rect;
}

Rect2 Viewport::get_attach_to_screen_rect() const {

	return to_screen_rect;
}

void Viewport::set_physics_object_picking(bool p_enable) {

	physics_object_picking = p_enable;
	if (!physics_object_picking) {
		physics_picking_events.clear();
	}
}

bool Viewport::get_physics_object_picking() {

	return physics_object_picking;
}

Vector2 Viewport::get_camera_coords(const Vector2 &p_viewport_coords) const {

	Transform2D xf = get_final_transform();
	return xf.xform(p_viewport_coords);
}

Vector2 Viewport::get_camera_rect_size() const {

	return size;
}

bool Viewport::gui_has_modal_stack() const {

	return gui.modal_stack.size();
}

void Viewport::set_disable_input(bool p_disable) {
	disable_input = p_disable;
}

bool Viewport::is_input_disabled() const {

	return disable_input;
}

void Viewport::set_disable_3d(bool p_disable) {
	disable_3d = p_disable;
	VS::get_singleton()->viewport_set_disable_3d(viewport, p_disable);
}

bool Viewport::is_3d_disabled() const {

	return disable_3d;
}

void Viewport::set_keep_3d_linear(bool p_keep_3d_linear) {
	keep_3d_linear = p_keep_3d_linear;
	VS::get_singleton()->viewport_set_keep_3d_linear(viewport, keep_3d_linear);
}

bool Viewport::get_keep_3d_linear() const {

	return keep_3d_linear;
}

Variant Viewport::gui_get_drag_data() const {
	return gui.drag_data;
}

Control *Viewport::get_modal_stack_top() const {
	return gui.modal_stack.size() ? gui.modal_stack.back()->get() : NULL;
}

String Viewport::get_configuration_warning() const {

	/*if (get_parent() && !Object::cast_to<Control>(get_parent()) && !render_target) {

		return TTR("This viewport is not set as render target. If you intend for it to display its contents directly to the screen, make it a child of a Control so it can obtain a size. Otherwise, make it a RenderTarget and assign its internal texture to some node for display.");
	}*/

	return String();
}

void Viewport::gui_reset_canvas_sort_index() {
	gui.canvas_sort_index = 0;
}
int Viewport::gui_get_canvas_sort_index() {

	return gui.canvas_sort_index++;
}

void Viewport::set_msaa(MSAA p_msaa) {

	ERR_FAIL_INDEX(p_msaa, 5);
	if (msaa == p_msaa)
		return;
	msaa = p_msaa;
	VS::get_singleton()->viewport_set_msaa(viewport, VS::ViewportMSAA(p_msaa));
}

Viewport::MSAA Viewport::get_msaa() const {

	return msaa;
}

void Viewport::set_hdr(bool p_hdr) {

	if (hdr == p_hdr)
		return;

	hdr = p_hdr;
	VS::get_singleton()->viewport_set_hdr(viewport, p_hdr);
}

bool Viewport::get_hdr() const {

	return hdr;
}

void Viewport::set_usage(Usage p_usage) {

	usage = p_usage;
	VS::get_singleton()->viewport_set_usage(viewport, VS::ViewportUsage(p_usage));
}

Viewport::Usage Viewport::get_usage() const {
	return usage;
}

void Viewport::set_debug_draw(DebugDraw p_debug_draw) {

	debug_draw = p_debug_draw;
	VS::get_singleton()->viewport_set_debug_draw(viewport, VS::ViewportDebugDraw(p_debug_draw));
}

Viewport::DebugDraw Viewport::get_debug_draw() const {

	return debug_draw;
}

int Viewport::get_render_info(RenderInfo p_info) {

	return VS::get_singleton()->viewport_get_render_info(viewport, VS::ViewportRenderInfo(p_info));
}

void Viewport::set_snap_controls_to_pixels(bool p_enable) {

	snap_controls_to_pixels = p_enable;
}

bool Viewport::is_snap_controls_to_pixels_enabled() const {

	return snap_controls_to_pixels;
}

bool Viewport::gui_is_dragging() const {
	return gui.dragging;
}

void Viewport::set_input_as_handled() {
	if (handle_input_locally) {
		local_input_handled = true;
	} else {
		ERR_FAIL_COND(!is_inside_tree());
		get_tree()->set_input_as_handled();
	}
}

bool Viewport::is_input_handled() const {
	if (handle_input_locally) {
		return local_input_handled;
	} else {
		ERR_FAIL_COND_V(!is_inside_tree(), false);
		return get_tree()->is_input_handled();
	}
}

void Viewport::set_handle_input_locally(bool p_enable) {
	handle_input_locally = p_enable;
}

bool Viewport::is_handling_input_locally() const {
	return handle_input_locally;
}

void Viewport::_validate_property(PropertyInfo &property) const {

	if (VisualServer::get_singleton()->is_low_end() && property.name == "hdr") {
		property.usage = PROPERTY_USAGE_NOEDITOR | PROPERTY_USAGE_INTERNAL;
	}
}

void Viewport::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_use_arvr", "use"), &Viewport::set_use_arvr);
	ClassDB::bind_method(D_METHOD("use_arvr"), &Viewport::use_arvr);

	ClassDB::bind_method(D_METHOD("set_size", "size"), &Viewport::set_size);
	ClassDB::bind_method(D_METHOD("get_size"), &Viewport::get_size);
	ClassDB::bind_method(D_METHOD("set_world_2d", "world_2d"), &Viewport::set_world_2d);
	ClassDB::bind_method(D_METHOD("get_world_2d"), &Viewport::get_world_2d);
	ClassDB::bind_method(D_METHOD("find_world_2d"), &Viewport::find_world_2d);
	ClassDB::bind_method(D_METHOD("set_world", "world"), &Viewport::set_world);
	ClassDB::bind_method(D_METHOD("get_world"), &Viewport::get_world);
	ClassDB::bind_method(D_METHOD("find_world"), &Viewport::find_world);

	ClassDB::bind_method(D_METHOD("set_canvas_transform", "xform"), &Viewport::set_canvas_transform);
	ClassDB::bind_method(D_METHOD("get_canvas_transform"), &Viewport::get_canvas_transform);

	ClassDB::bind_method(D_METHOD("set_global_canvas_transform", "xform"), &Viewport::set_global_canvas_transform);
	ClassDB::bind_method(D_METHOD("get_global_canvas_transform"), &Viewport::get_global_canvas_transform);
	ClassDB::bind_method(D_METHOD("get_final_transform"), &Viewport::get_final_transform);

	ClassDB::bind_method(D_METHOD("get_visible_rect"), &Viewport::get_visible_rect);
	ClassDB::bind_method(D_METHOD("set_transparent_background", "enable"), &Viewport::set_transparent_background);
	ClassDB::bind_method(D_METHOD("has_transparent_background"), &Viewport::has_transparent_background);

	ClassDB::bind_method(D_METHOD("_vp_input"), &Viewport::_vp_input);
	ClassDB::bind_method(D_METHOD("_vp_input_text", "text"), &Viewport::_vp_input_text);
	ClassDB::bind_method(D_METHOD("_vp_unhandled_input"), &Viewport::_vp_unhandled_input);

	ClassDB::bind_method(D_METHOD("set_size_override", "enable", "size", "margin"), &Viewport::set_size_override, DEFVAL(Size2(-1, -1)), DEFVAL(Size2(0, 0)));
	ClassDB::bind_method(D_METHOD("get_size_override"), &Viewport::get_size_override);
	ClassDB::bind_method(D_METHOD("is_size_override_enabled"), &Viewport::is_size_override_enabled);
	ClassDB::bind_method(D_METHOD("set_size_override_stretch", "enabled"), &Viewport::set_size_override_stretch);
	ClassDB::bind_method(D_METHOD("is_size_override_stretch_enabled"), &Viewport::is_size_override_stretch_enabled);

	ClassDB::bind_method(D_METHOD("set_vflip", "enable"), &Viewport::set_vflip);
	ClassDB::bind_method(D_METHOD("get_vflip"), &Viewport::get_vflip);

	ClassDB::bind_method(D_METHOD("set_clear_mode", "mode"), &Viewport::set_clear_mode);
	ClassDB::bind_method(D_METHOD("get_clear_mode"), &Viewport::get_clear_mode);

	ClassDB::bind_method(D_METHOD("set_update_mode", "mode"), &Viewport::set_update_mode);
	ClassDB::bind_method(D_METHOD("get_update_mode"), &Viewport::get_update_mode);

	ClassDB::bind_method(D_METHOD("set_msaa", "msaa"), &Viewport::set_msaa);
	ClassDB::bind_method(D_METHOD("get_msaa"), &Viewport::get_msaa);

	ClassDB::bind_method(D_METHOD("set_hdr", "enable"), &Viewport::set_hdr);
	ClassDB::bind_method(D_METHOD("get_hdr"), &Viewport::get_hdr);

	ClassDB::bind_method(D_METHOD("set_usage", "usage"), &Viewport::set_usage);
	ClassDB::bind_method(D_METHOD("get_usage"), &Viewport::get_usage);

	ClassDB::bind_method(D_METHOD("set_debug_draw", "debug_draw"), &Viewport::set_debug_draw);
	ClassDB::bind_method(D_METHOD("get_debug_draw"), &Viewport::get_debug_draw);

	ClassDB::bind_method(D_METHOD("get_render_info", "info"), &Viewport::get_render_info);

	ClassDB::bind_method(D_METHOD("get_texture"), &Viewport::get_texture);

	ClassDB::bind_method(D_METHOD("set_physics_object_picking", "enable"), &Viewport::set_physics_object_picking);
	ClassDB::bind_method(D_METHOD("get_physics_object_picking"), &Viewport::get_physics_object_picking);

	ClassDB::bind_method(D_METHOD("get_viewport_rid"), &Viewport::get_viewport_rid);
	ClassDB::bind_method(D_METHOD("input", "local_event"), &Viewport::input);
	ClassDB::bind_method(D_METHOD("unhandled_input", "local_event"), &Viewport::unhandled_input);

	ClassDB::bind_method(D_METHOD("update_worlds"), &Viewport::update_worlds);

	ClassDB::bind_method(D_METHOD("set_use_own_world", "enable"), &Viewport::set_use_own_world);
	ClassDB::bind_method(D_METHOD("is_using_own_world"), &Viewport::is_using_own_world);

	ClassDB::bind_method(D_METHOD("get_camera"), &Viewport::get_camera);

	ClassDB::bind_method(D_METHOD("set_as_audio_listener", "enable"), &Viewport::set_as_audio_listener);
	ClassDB::bind_method(D_METHOD("is_audio_listener"), &Viewport::is_audio_listener);

	ClassDB::bind_method(D_METHOD("set_as_audio_listener_2d", "enable"), &Viewport::set_as_audio_listener_2d);
	ClassDB::bind_method(D_METHOD("is_audio_listener_2d"), &Viewport::is_audio_listener_2d);
	ClassDB::bind_method(D_METHOD("set_attach_to_screen_rect", "rect"), &Viewport::set_attach_to_screen_rect);

	ClassDB::bind_method(D_METHOD("get_mouse_position"), &Viewport::get_mouse_position);
	ClassDB::bind_method(D_METHOD("warp_mouse", "to_position"), &Viewport::warp_mouse);

	ClassDB::bind_method(D_METHOD("gui_has_modal_stack"), &Viewport::gui_has_modal_stack);
	ClassDB::bind_method(D_METHOD("gui_get_drag_data"), &Viewport::gui_get_drag_data);
	ClassDB::bind_method(D_METHOD("gui_is_dragging"), &Viewport::gui_is_dragging);

	ClassDB::bind_method(D_METHOD("get_modal_stack_top"), &Viewport::get_modal_stack_top);

	ClassDB::bind_method(D_METHOD("set_disable_input", "disable"), &Viewport::set_disable_input);
	ClassDB::bind_method(D_METHOD("is_input_disabled"), &Viewport::is_input_disabled);

	ClassDB::bind_method(D_METHOD("set_disable_3d", "disable"), &Viewport::set_disable_3d);
	ClassDB::bind_method(D_METHOD("is_3d_disabled"), &Viewport::is_3d_disabled);

	ClassDB::bind_method(D_METHOD("set_keep_3d_linear", "keep_3d_linear"), &Viewport::set_keep_3d_linear);
	ClassDB::bind_method(D_METHOD("get_keep_3d_linear"), &Viewport::get_keep_3d_linear);

	ClassDB::bind_method(D_METHOD("_gui_show_tooltip"), &Viewport::_gui_show_tooltip);
	ClassDB::bind_method(D_METHOD("_gui_remove_focus"), &Viewport::_gui_remove_focus);
	ClassDB::bind_method(D_METHOD("_post_gui_grab_click_focus"), &Viewport::_post_gui_grab_click_focus);

	ClassDB::bind_method(D_METHOD("set_shadow_atlas_size", "size"), &Viewport::set_shadow_atlas_size);
	ClassDB::bind_method(D_METHOD("get_shadow_atlas_size"), &Viewport::get_shadow_atlas_size);

	ClassDB::bind_method(D_METHOD("set_snap_controls_to_pixels", "enabled"), &Viewport::set_snap_controls_to_pixels);
	ClassDB::bind_method(D_METHOD("is_snap_controls_to_pixels_enabled"), &Viewport::is_snap_controls_to_pixels_enabled);

	ClassDB::bind_method(D_METHOD("set_shadow_atlas_quadrant_subdiv", "quadrant", "subdiv"), &Viewport::set_shadow_atlas_quadrant_subdiv);
	ClassDB::bind_method(D_METHOD("get_shadow_atlas_quadrant_subdiv", "quadrant"), &Viewport::get_shadow_atlas_quadrant_subdiv);

	ClassDB::bind_method(D_METHOD("set_input_as_handled"), &Viewport::set_input_as_handled);
	ClassDB::bind_method(D_METHOD("is_input_handled"), &Viewport::is_input_handled);

	ClassDB::bind_method(D_METHOD("set_handle_input_locally", "enable"), &Viewport::set_handle_input_locally);
	ClassDB::bind_method(D_METHOD("is_handling_input_locally"), &Viewport::is_handling_input_locally);

	ClassDB::bind_method(D_METHOD("_subwindow_visibility_changed"), &Viewport::_subwindow_visibility_changed);

	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "arvr"), "set_use_arvr", "use_arvr");

	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "size"), "set_size", "get_size");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "own_world"), "set_use_own_world", "is_using_own_world");
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "world", PROPERTY_HINT_RESOURCE_TYPE, "World"), "set_world", "get_world");
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "world_2d", PROPERTY_HINT_RESOURCE_TYPE, "World2D", 0), "set_world_2d", "get_world_2d");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "transparent_bg"), "set_transparent_background", "has_transparent_background");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "handle_input_locally"), "set_handle_input_locally", "is_handling_input_locally");
	ADD_GROUP("Rendering", "");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "msaa", PROPERTY_HINT_ENUM, "Disabled,2x,4x,8x,16x"), "set_msaa", "get_msaa");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "hdr"), "set_hdr", "get_hdr");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "disable_3d"), "set_disable_3d", "is_3d_disabled");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "keep_3d_linear"), "set_keep_3d_linear", "get_keep_3d_linear");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "usage", PROPERTY_HINT_ENUM, "2D,2D No-Sampling,3D,3D No-Effects"), "set_usage", "get_usage");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "debug_draw", PROPERTY_HINT_ENUM, "Disabled,Unshaded,Overdraw,Wireframe"), "set_debug_draw", "get_debug_draw");
	ADD_GROUP("Render Target", "render_target_");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "render_target_v_flip"), "set_vflip", "get_vflip");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "render_target_clear_mode", PROPERTY_HINT_ENUM, "Always,Never,Next Frame"), "set_clear_mode", "get_clear_mode");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "render_target_update_mode", PROPERTY_HINT_ENUM, "Disabled,Once,When Visible,Always"), "set_update_mode", "get_update_mode");
	ADD_GROUP("Audio Listener", "audio_listener_");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "audio_listener_enable_2d"), "set_as_audio_listener_2d", "is_audio_listener_2d");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "audio_listener_enable_3d"), "set_as_audio_listener", "is_audio_listener");
	ADD_GROUP("Physics", "physics_");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "physics_object_picking"), "set_physics_object_picking", "get_physics_object_picking");
	ADD_GROUP("GUI", "gui_");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "gui_disable_input"), "set_disable_input", "is_input_disabled");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "gui_snap_controls_to_pixels"), "set_snap_controls_to_pixels", "is_snap_controls_to_pixels_enabled");
	ADD_GROUP("Shadow Atlas", "shadow_atlas_");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "shadow_atlas_size"), "set_shadow_atlas_size", "get_shadow_atlas_size");
	ADD_PROPERTYI(PropertyInfo(Variant::INT, "shadow_atlas_quad_0", PROPERTY_HINT_ENUM, "Disabled,1 Shadow,4 Shadows,16 Shadows,64 Shadows,256 Shadows,1024 Shadows"), "set_shadow_atlas_quadrant_subdiv", "get_shadow_atlas_quadrant_subdiv", 0);
	ADD_PROPERTYI(PropertyInfo(Variant::INT, "shadow_atlas_quad_1", PROPERTY_HINT_ENUM, "Disabled,1 Shadow,4 Shadows,16 Shadows,64 Shadows,256 Shadows,1024 Shadows"), "set_shadow_atlas_quadrant_subdiv", "get_shadow_atlas_quadrant_subdiv", 1);
	ADD_PROPERTYI(PropertyInfo(Variant::INT, "shadow_atlas_quad_2", PROPERTY_HINT_ENUM, "Disabled,1 Shadow,4 Shadows,16 Shadows,64 Shadows,256 Shadows,1024 Shadows"), "set_shadow_atlas_quadrant_subdiv", "get_shadow_atlas_quadrant_subdiv", 2);
	ADD_PROPERTYI(PropertyInfo(Variant::INT, "shadow_atlas_quad_3", PROPERTY_HINT_ENUM, "Disabled,1 Shadow,4 Shadows,16 Shadows,64 Shadows,256 Shadows,1024 Shadows"), "set_shadow_atlas_quadrant_subdiv", "get_shadow_atlas_quadrant_subdiv", 3);
	ADD_PROPERTY(PropertyInfo(Variant::TRANSFORM2D, "canvas_transform", PROPERTY_HINT_NONE, "", 0), "set_canvas_transform", "get_canvas_transform");
	ADD_PROPERTY(PropertyInfo(Variant::TRANSFORM2D, "global_canvas_transform", PROPERTY_HINT_NONE, "", 0), "set_global_canvas_transform", "get_global_canvas_transform");

	ADD_SIGNAL(MethodInfo("size_changed"));

	BIND_ENUM_CONSTANT(UPDATE_DISABLED);
	BIND_ENUM_CONSTANT(UPDATE_ONCE);
	BIND_ENUM_CONSTANT(UPDATE_WHEN_VISIBLE);
	BIND_ENUM_CONSTANT(UPDATE_ALWAYS);

	BIND_ENUM_CONSTANT(SHADOW_ATLAS_QUADRANT_SUBDIV_DISABLED);
	BIND_ENUM_CONSTANT(SHADOW_ATLAS_QUADRANT_SUBDIV_1);
	BIND_ENUM_CONSTANT(SHADOW_ATLAS_QUADRANT_SUBDIV_4);
	BIND_ENUM_CONSTANT(SHADOW_ATLAS_QUADRANT_SUBDIV_16);
	BIND_ENUM_CONSTANT(SHADOW_ATLAS_QUADRANT_SUBDIV_64);
	BIND_ENUM_CONSTANT(SHADOW_ATLAS_QUADRANT_SUBDIV_256);
	BIND_ENUM_CONSTANT(SHADOW_ATLAS_QUADRANT_SUBDIV_1024);
	BIND_ENUM_CONSTANT(SHADOW_ATLAS_QUADRANT_SUBDIV_MAX);

	BIND_ENUM_CONSTANT(RENDER_INFO_OBJECTS_IN_FRAME);
	BIND_ENUM_CONSTANT(RENDER_INFO_VERTICES_IN_FRAME);
	BIND_ENUM_CONSTANT(RENDER_INFO_MATERIAL_CHANGES_IN_FRAME);
	BIND_ENUM_CONSTANT(RENDER_INFO_SHADER_CHANGES_IN_FRAME);
	BIND_ENUM_CONSTANT(RENDER_INFO_SURFACE_CHANGES_IN_FRAME);
	BIND_ENUM_CONSTANT(RENDER_INFO_DRAW_CALLS_IN_FRAME);
	BIND_ENUM_CONSTANT(RENDER_INFO_MAX);

	BIND_ENUM_CONSTANT(DEBUG_DRAW_DISABLED);
	BIND_ENUM_CONSTANT(DEBUG_DRAW_UNSHADED);
	BIND_ENUM_CONSTANT(DEBUG_DRAW_OVERDRAW);
	BIND_ENUM_CONSTANT(DEBUG_DRAW_WIREFRAME);

	BIND_ENUM_CONSTANT(MSAA_DISABLED);
	BIND_ENUM_CONSTANT(MSAA_2X);
	BIND_ENUM_CONSTANT(MSAA_4X);
	BIND_ENUM_CONSTANT(MSAA_8X);
	BIND_ENUM_CONSTANT(MSAA_16X);

	BIND_ENUM_CONSTANT(USAGE_2D);
	BIND_ENUM_CONSTANT(USAGE_2D_NO_SAMPLING);
	BIND_ENUM_CONSTANT(USAGE_3D);
	BIND_ENUM_CONSTANT(USAGE_3D_NO_EFFECTS);

	BIND_ENUM_CONSTANT(CLEAR_MODE_ALWAYS);
	BIND_ENUM_CONSTANT(CLEAR_MODE_NEVER);
	BIND_ENUM_CONSTANT(CLEAR_MODE_ONLY_NEXT_FRAME);
}

void Viewport::_subwindow_visibility_changed() {

	// unfortunately, we don't know the sender, i.e. which subwindow changed;
	// so we have to check them all.
	gui.subwindow_visibility_dirty = true;
}

Viewport::Viewport() {

	world_2d = Ref<World2D>(memnew(World2D));

	viewport = VisualServer::get_singleton()->viewport_create();
	texture_rid = VisualServer::get_singleton()->viewport_get_texture(viewport);
	texture_flags = 0;

	default_texture.instance();
	default_texture->vp = const_cast<Viewport *>(this);
	viewport_textures.insert(default_texture.ptr());
	VS::get_singleton()->texture_set_proxy(default_texture->proxy, texture_rid);

	//internal_listener = SpatialSoundServer::get_singleton()->listener_create();
	audio_listener = false;
	//internal_listener_2d = SpatialSound2DServer::get_singleton()->listener_create();
	audio_listener_2d = false;
	transparent_bg = false;
	parent = NULL;
	listener = NULL;
	camera = NULL;
	canvas_layers.insert(NULL); // This eases picking code (interpreted as the canvas of the Viewport)
	arvr = false;
	size_override = false;
	size_override_stretch = false;
	size_override_size = Size2(1, 1);
	gen_mipmaps = false;

	vflip = false;

	//clear=true;
	update_mode = UPDATE_WHEN_VISIBLE;

	physics_object_picking = false;
	physics_object_capture = 0;
	physics_object_over = 0;
	physics_has_last_mousepos = false;
	physics_last_mousepos = Vector2(Math_INF, Math_INF);

	shadow_atlas_size = 0;
	for (int i = 0; i < 4; i++) {
		shadow_atlas_quadrant_subdiv[i] = SHADOW_ATLAS_QUADRANT_SUBDIV_MAX;
	}
	set_shadow_atlas_quadrant_subdiv(0, SHADOW_ATLAS_QUADRANT_SUBDIV_4);
	set_shadow_atlas_quadrant_subdiv(1, SHADOW_ATLAS_QUADRANT_SUBDIV_4);
	set_shadow_atlas_quadrant_subdiv(2, SHADOW_ATLAS_QUADRANT_SUBDIV_16);
	set_shadow_atlas_quadrant_subdiv(3, SHADOW_ATLAS_QUADRANT_SUBDIV_64);

	String id = itos(get_instance_id());
	input_group = "_vp_input" + id;
	gui_input_group = "_vp_gui_input" + id;
	unhandled_input_group = "_vp_unhandled_input" + id;
	unhandled_key_input_group = "_vp_unhandled_key_input" + id;

	disable_input = false;
	disable_3d = false;
	keep_3d_linear = false;

	//window tooltip
	gui.tooltip_timer = -1;

	//gui.tooltip_timer->force_parent_owned();
	gui.tooltip_delay = GLOBAL_DEF("gui/timers/tooltip_delay_sec", 0.5);
	ProjectSettings::get_singleton()->set_custom_property_info("gui/timers/tooltip_delay_sec", PropertyInfo(Variant::REAL, "gui/timers/tooltip_delay_sec", PROPERTY_HINT_RANGE, "0,5,0.01,or_greater")); // No negative numbers

	gui.tooltip = NULL;
	gui.tooltip_label = NULL;
	gui.drag_preview = NULL;
	gui.drag_attempted = false;
	gui.canvas_sort_index = 0;
	gui.roots_order_dirty = false;
	gui.mouse_focus = NULL;
	gui.last_mouse_focus = NULL;

	msaa = MSAA_DISABLED;
	hdr = true;

	usage = USAGE_3D;
	debug_draw = DEBUG_DRAW_DISABLED;
	clear_mode = CLEAR_MODE_ALWAYS;

	snap_controls_to_pixels = true;
	physics_last_mouse_state.alt = false;
	physics_last_mouse_state.control = false;
	physics_last_mouse_state.shift = false;
	physics_last_mouse_state.meta = false;
	physics_last_mouse_state.mouse_mask = 0;
	local_input_handled = false;
	handle_input_locally = true;
	physics_last_id = 0; //ensures first time there will be a check
}

Viewport::~Viewport() {

	//erase itself from viewport textures
	for (Set<ViewportTexture *>::Element *E = viewport_textures.front(); E; E = E->next()) {
		E->get()->vp = NULL;
	}
	VisualServer::get_singleton()->free(viewport);
	//SpatialSoundServer::get_singleton()->free(internal_listener);
	//SpatialSound2DServer::get_singleton()->free(internal_listener_2d);
}