/*************************************************************************/
/*  spatial.cpp                                                          */
/*************************************************************************/
/*                         This file is part of:                         */
/*                          PANDEMONIUM ENGINE                           */
/*             https://github.com/Relintai/pandemonium_engine            */
/*************************************************************************/
/* Copyright (c) 2022-present Péter Magyar.                              */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* 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 "spatial.h"

#include "core/config/engine.h"
#include "core/math/transform_interpolator.h"
#include "core/object/message_queue.h"
#include "scene/main/scene_string_names.h"
#include "scene/main/scene_tree.h"
#include "scene/main/world.h"
#include "scene/resources/world_3d.h"
#include "servers/rendering_server_callbacks.h"

/*

 possible algorithms:

 Algorithm 1: (current)

 definition of invalidation: global is invalid

 1) If a node sets a LOCAL, it produces an invalidation of everything above
 .  a) If above is invalid, don't keep invalidating upwards
 2) If a node sets a GLOBAL, it is converted to LOCAL (and forces validation of everything pending below)

 drawback: setting/reading globals is useful and used very very often, and using affine inverses is slow

---

 Algorithm 2: (no longer current)

 definition of invalidation: NONE dirty, LOCAL dirty, GLOBAL dirty

 1) If a node sets a LOCAL, it must climb the tree and set it as GLOBAL dirty
 .  a) marking GLOBALs as dirty up all the tree must be done always
 2) If a node sets a GLOBAL, it marks local as dirty, and that's all?

 //is clearing the dirty state correct in this case?

 drawback: setting a local down the tree forces many tree walks often

--

future: no idea

 */

SpatialGizmo::SpatialGizmo() {
}

void Spatial::_notify_dirty() {
#ifdef TOOLS_ENABLED
	if ((!data.gizmos.empty() || data.notify_transform) && !data.ignore_notification && !xform_change.in_list()) {
#else
	if (data.notify_transform && !data.ignore_notification && !xform_change.in_list()) {

#endif
		get_tree()->xform_change_list.add(&xform_change);
	}
}

void Spatial::_update_local_transform() const {
	data.local_transform.basis.set_euler_scale(data.rotation, data.scale);

	data.dirty &= ~DIRTY_LOCAL;
}
void Spatial::_propagate_transform_changed(Spatial *p_origin) {
	if (!is_inside_tree()) {
		return;
	}

	/*
	if (data.dirty&DIRTY_GLOBAL)
		return; //already dirty
	*/

	data.children_lock++;

	for (List<Spatial *>::Element *E = data.children.front(); E; E = E->next()) {
		if (E->get()->data.toplevel_active) {
			continue; //don't propagate to a toplevel
		}
		E->get()->_propagate_transform_changed(p_origin);
	}
#ifdef TOOLS_ENABLED
	if ((!data.gizmos.empty() || data.notify_transform) && !data.ignore_notification && !xform_change.in_list()) {
#else
	if (data.notify_transform && !data.ignore_notification && !xform_change.in_list()) {
#endif
		get_tree()->xform_change_list.add(&xform_change);
	}
	data.dirty |= DIRTY_GLOBAL;

	data.children_lock--;
}

void Spatial::notification_callback(int p_message_type) {
	switch (p_message_type) {
		default:
			break;
		case RenderingServerCallbacks::CALLBACK_NOTIFICATION_ENTER_GAMEPLAY: {
			notification(NOTIFICATION_ENTER_GAMEPLAY);
		} break;
		case RenderingServerCallbacks::CALLBACK_NOTIFICATION_EXIT_GAMEPLAY: {
			notification(NOTIFICATION_EXIT_GAMEPLAY);
		} break;
		case RenderingServerCallbacks::CALLBACK_SIGNAL_ENTER_GAMEPLAY: {
			emit_signal("gameplay_entered");
		} break;
		case RenderingServerCallbacks::CALLBACK_SIGNAL_EXIT_GAMEPLAY: {
			emit_signal("gameplay_exited");
		} break;
	}
}

void Spatial::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_TREE: {
			ERR_FAIL_COND(!get_tree());

			Node *p = get_parent();
			if (p) {
				data.parent = Object::cast_to<Spatial>(p);
			}

			if (data.parent) {
				data.C = data.parent->data.children.push_back(this);
			} else {
				data.C = nullptr;
			}

			if (data.toplevel && !Engine::get_singleton()->is_editor_hint()) {
				if (data.parent) {
					data.local_transform = data.parent->get_global_transform() * get_transform();
					data.dirty = DIRTY_VECTORS; //global is always dirty upon entering a scene
				}
				data.toplevel_active = true;
			}

			if (data.merging_mode == MERGING_MODE_INHERIT) {
				bool merging_allowed = true; // Root node default is for merging to be on
				if (data.parent) {
					merging_allowed = data.parent->is_merging_allowed();
				}
				_propagate_merging_allowed(merging_allowed);
			}

			data.dirty |= DIRTY_GLOBAL; //global is always dirty upon entering a scene
			_notify_dirty();

			notification(NOTIFICATION_ENTER_WORLD);

		} break;
		case NOTIFICATION_EXIT_TREE: {
			notification(NOTIFICATION_EXIT_WORLD, true);
			if (xform_change.in_list()) {
				get_tree()->xform_change_list.remove(&xform_change);
			}
			if (data.C) {
				data.parent->data.children.erase(data.C);
			}
			data.parent = nullptr;
			data.C = nullptr;
			data.toplevel_active = false;
			_disable_client_physics_interpolation();
		} break;
		case NOTIFICATION_ENTER_WORLD: {
			data.inside_world = true;

			if (get_script_instance()) {
				get_script_instance()->call_multilevel(SceneStringNames::get_singleton()->_enter_world, nullptr, 0);
			}
#ifdef TOOLS_ENABLED
			if (Engine::get_singleton()->is_editor_hint() && get_tree()->is_node_being_edited(this)) {
				get_tree()->call_group_flags(0, SceneStringNames::get_singleton()->_spatial_editor_group, SceneStringNames::get_singleton()->_request_gizmo, this);

				if (!data.gizmos_disabled) {
					for (int i = 0; i < data.gizmos.size(); i++) {
						data.gizmos.write[i]->create();

						if (is_visible_in_tree()) {
							data.gizmos.write[i]->redraw();
						}
						data.gizmos.write[i]->transform();
					}
				}
			}
#endif

		} break;
		case NOTIFICATION_EXIT_WORLD: {
#ifdef TOOLS_ENABLED
			clear_gizmos();
#endif

			if (get_script_instance()) {
				get_script_instance()->call_multilevel(SceneStringNames::get_singleton()->_exit_world, nullptr, 0);
			}

			data.inside_world = false;

		} break;

		case NOTIFICATION_TRANSFORM_CHANGED: {
#ifdef TOOLS_ENABLED
			for (int i = 0; i < data.gizmos.size(); i++) {
				data.gizmos.write[i]->transform();
			}
#endif
		} break;
		case NOTIFICATION_RESET_PHYSICS_INTERPOLATION: {
			if (data.client_physics_interpolation_data) {
				data.client_physics_interpolation_data->global_xform_prev = data.client_physics_interpolation_data->global_xform_curr;
			}
		} break;

		default: {
		}
	}
}

Vector3 Spatial::get_global_translation() const {
	return get_global_transform().get_origin();
}

void Spatial::set_global_translation(const Vector3 &p_translation) {
	Transform transform = get_global_transform();
	transform.set_origin(p_translation);
	set_global_transform(transform);
}

Vector3 Spatial::get_global_rotation() const {
	return get_global_transform().get_basis().get_euler();
}

void Spatial::set_global_rotation(const Vector3 &p_euler_rad) {
	Transform transform = get_global_transform();
	Basis new_basis = transform.get_basis();
	new_basis.set_euler(p_euler_rad);
	transform.set_basis(new_basis);
	set_global_transform(transform);
}

void Spatial::set_transform(const Transform &p_transform) {
	data.local_transform = p_transform;
	data.dirty |= DIRTY_VECTORS;
	data.dirty &= ~DIRTY_LOCAL;
	_change_notify("translation");
	_change_notify("rotation");
	_change_notify("rotation_degrees");
	_change_notify("scale");
	_propagate_transform_changed(this);
	if (data.notify_local_transform) {
		notification(NOTIFICATION_LOCAL_TRANSFORM_CHANGED);
	}
}

void Spatial::set_global_transform(const Transform &p_transform) {
	Transform xform = (data.parent && !data.toplevel_active) ? data.parent->get_global_transform().affine_inverse() * p_transform : p_transform;

	set_transform(xform);
}

Transform Spatial::get_transform() const {
	if (data.dirty & DIRTY_LOCAL) {
		_update_local_transform();
	}

	return data.local_transform;
}

// Return false to timeout and remove from the client interpolation list.
bool Spatial::update_client_physics_interpolation_data() {
	if (!is_inside_tree() || !_is_physics_interpolated_client_side()) {
		return false;
	}
	ERR_FAIL_NULL_V(data.client_physics_interpolation_data, false);
	ClientPhysicsInterpolationData &pid = *data.client_physics_interpolation_data;

	uint64_t tick = Engine::get_singleton()->get_physics_frames();

	// Has this update been done already this tick?
	// (for instance, get_global_transform_interpolated() could be called multiple times)
	if (pid.current_physics_tick != tick) {
		// timeout?
		if (tick >= pid.timeout_physics_tick) {
			return false;
		}

		if (pid.current_physics_tick == (tick - 1)) {
			// normal interpolation situation, there is a continuous flow of data
			// from one tick to the next...
			pid.global_xform_prev = pid.global_xform_curr;
		} else {
			// there has been a gap, we cannot sensibly offer interpolation over
			// a multitick gap, so we will teleport
			pid.global_xform_prev = get_global_transform();
		}
		pid.current_physics_tick = tick;
	}

	pid.global_xform_curr = get_global_transform();
	return true;
}

void Spatial::_disable_client_physics_interpolation() {
	// Disable any current client side interpolation
	// (this can always restart as normal if you later re-attach the node to the SceneTree)
	if (data.client_physics_interpolation_data) {
		memdelete(data.client_physics_interpolation_data);
		data.client_physics_interpolation_data = nullptr;

		SceneTree *tree = get_tree();
		if (tree && _client_physics_interpolation_spatials_list.in_list()) {
			tree->client_physics_interpolation_remove_spatial(&_client_physics_interpolation_spatials_list);
		}
	}
	_set_physics_interpolated_client_side(false);
}

Transform Spatial::_get_global_transform_interpolated(real_t p_interpolation_fraction) {
	ERR_FAIL_COND_V(!is_inside_tree(), Transform());

	// set in motion the mechanisms for client side interpolation if not already active
	if (!_is_physics_interpolated_client_side()) {
		_set_physics_interpolated_client_side(true);

		ERR_FAIL_COND_V(data.client_physics_interpolation_data, Transform());
		data.client_physics_interpolation_data = memnew(ClientPhysicsInterpolationData);
		data.client_physics_interpolation_data->global_xform_curr = get_global_transform();
		data.client_physics_interpolation_data->global_xform_prev = data.client_physics_interpolation_data->global_xform_curr;
		data.client_physics_interpolation_data->current_physics_tick = Engine::get_singleton()->get_physics_frames();
	}

	// Storing the last tick we requested client interpolation allows us to timeout
	// and remove client interpolated nodes from the list to save processing.
	// We use some arbitrary timeout here, but this could potentially be user defined.

	// Note: This timeout has to be larger than the number of ticks in a frame, otherwise the interpolated
	// data will stop flowing before the next frame is drawn. This should only be relevant at high tick rates.
	// We could alternatively do this by frames rather than ticks and avoid this problem, but then the behaviour
	// would be machine dependent.
	data.client_physics_interpolation_data->timeout_physics_tick = Engine::get_singleton()->get_physics_frames() + 256;

	// make sure data is up to date
	update_client_physics_interpolation_data();

	// interpolate the current data
	const Transform &xform_curr = data.client_physics_interpolation_data->global_xform_curr;
	const Transform &xform_prev = data.client_physics_interpolation_data->global_xform_prev;

	Transform res;
	TransformInterpolator::interpolate_transform(xform_prev, xform_curr, res, p_interpolation_fraction);

	SceneTree *tree = get_tree();

	// This should not happen, as is_inside_tree() is checked earlier
	ERR_FAIL_NULL_V(tree, res);
	if (!_client_physics_interpolation_spatials_list.in_list()) {
		tree->client_physics_interpolation_add_spatial(&_client_physics_interpolation_spatials_list);
	}

	return res;
}

Transform Spatial::get_global_transform_interpolated() {
	// Pass through if physics interpolation is switched off.
	// This is a convenience, as it allows you to easy turn off interpolation
	// without changing any code.
	if (!is_physics_interpolated_and_enabled()) {
		return get_global_transform();
	}

	// If we are in the physics frame, the interpolated global transform is meaningless.
	// However, there is an exception, we may want to use this as a means of starting off the client
	// interpolation pump if not already started (when _is_physics_interpolated_client_side() is false).
	if (Engine::get_singleton()->is_in_physics_frame() && _is_physics_interpolated_client_side()) {
		return get_global_transform();
	}

	return _get_global_transform_interpolated(Engine::get_singleton()->get_physics_interpolation_fraction());
}

Transform Spatial::get_global_transform() const {
	ERR_FAIL_COND_V(!is_inside_tree(), Transform());

	if (data.dirty & DIRTY_GLOBAL) {
		if (data.dirty & DIRTY_LOCAL) {
			_update_local_transform();
		}

		if (data.parent && !data.toplevel_active) {
			data.global_transform = data.parent->get_global_transform() * data.local_transform;
		} else {
			data.global_transform = data.local_transform;
		}

		if (data.disable_scale) {
			data.global_transform.basis.orthonormalize();
		}

		data.dirty &= ~DIRTY_GLOBAL;
	}

	return data.global_transform;
}

#ifdef TOOLS_ENABLED
Transform Spatial::get_global_gizmo_transform() const {
	return get_global_transform();
}

Transform Spatial::get_local_gizmo_transform() const {
	return get_transform();
}

// If not a VisualInstance, use this AABB for the orange box in the editor
AABB Spatial::get_fallback_gizmo_aabb() const {
	return AABB(Vector3(-0.2, -0.2, -0.2), Vector3(0.4, 0.4, 0.4));
}

#endif

Spatial *Spatial::get_parent_spatial() const {
	return data.parent;
}

void Spatial::_set_vi_visible(bool p_visible) {
	data.vi_visible = p_visible;
}

Transform Spatial::get_relative_transform(const Node *p_parent) const {
	if (p_parent == this) {
		return Transform();
	}

	ERR_FAIL_COND_V(!data.parent, Transform());

	if (p_parent == data.parent) {
		return get_transform();
	} else {
		return data.parent->get_relative_transform(p_parent) * get_transform();
	}
}

void Spatial::set_translation(const Vector3 &p_translation) {
	data.local_transform.origin = p_translation;
	_change_notify("transform");
	_propagate_transform_changed(this);
	if (data.notify_local_transform) {
		notification(NOTIFICATION_LOCAL_TRANSFORM_CHANGED);
	}
}

void Spatial::set_rotation(const Vector3 &p_euler_rad) {
	if (data.dirty & DIRTY_VECTORS) {
		data.scale = data.local_transform.basis.get_scale();
		data.dirty &= ~DIRTY_VECTORS;
	}

	data.rotation = p_euler_rad;
	data.dirty |= DIRTY_LOCAL;
	_change_notify("transform");
	_propagate_transform_changed(this);
	if (data.notify_local_transform) {
		notification(NOTIFICATION_LOCAL_TRANSFORM_CHANGED);
	}
}

void Spatial::set_rotation_degrees(const Vector3 &p_euler_deg) {
	set_rotation(p_euler_deg * Math_PI / 180.0);
}

void Spatial::set_scale(const Vector3 &p_scale) {
	if (data.dirty & DIRTY_VECTORS) {
		data.rotation = data.local_transform.basis.get_rotation();
		data.dirty &= ~DIRTY_VECTORS;
	}

	data.scale = p_scale;
	data.dirty |= DIRTY_LOCAL;
	_change_notify("transform");
	_propagate_transform_changed(this);
	if (data.notify_local_transform) {
		notification(NOTIFICATION_LOCAL_TRANSFORM_CHANGED);
	}
}

Vector3 Spatial::get_translation() const {
	return data.local_transform.origin;
}

Vector3 Spatial::get_rotation() const {
	if (data.dirty & DIRTY_VECTORS) {
		data.scale = data.local_transform.basis.get_scale();
		data.rotation = data.local_transform.basis.get_rotation();

		data.dirty &= ~DIRTY_VECTORS;
	}

	return data.rotation;
}

Vector3 Spatial::get_rotation_degrees() const {
	return get_rotation() * 180.0 / Math_PI;
}

Vector3 Spatial::get_scale() const {
	if (data.dirty & DIRTY_VECTORS) {
		data.scale = data.local_transform.basis.get_scale();
		data.rotation = data.local_transform.basis.get_rotation();

		data.dirty &= ~DIRTY_VECTORS;
	}

	return data.scale;
}

void Spatial::update_gizmos() {
#ifdef TOOLS_ENABLED
	if (!is_inside_world()) {
		return;
	}

	if (data.gizmos.empty()) {
		return;
	}

	data.gizmos_dirty = true;
	MessageQueue::get_singleton()->push_call(this, "_update_gizmos");
#endif
}

void Spatial::set_subgizmo_selection(Ref<SpatialGizmo> p_gizmo, int p_id, Transform p_transform) {
#ifdef TOOLS_ENABLED
	if (!is_inside_world()) {
		return;
	}

	if (Engine::get_singleton()->is_editor_hint() && get_tree()->is_node_being_edited(this)) {
		get_tree()->call_group_flags(0, SceneStringNames::get_singleton()->_spatial_editor_group, SceneStringNames::get_singleton()->_set_subgizmo_selection, this, p_gizmo, p_id, p_transform);
	}
#endif
}

void Spatial::clear_subgizmo_selection() {
#ifdef TOOLS_ENABLED
	if (!is_inside_world()) {
		return;
	}

	if (data.gizmos.empty()) {
		return;
	}

	if (Engine::get_singleton()->is_editor_hint() && get_tree()->is_node_being_edited(this)) {
		get_tree()->call_group_flags(0, SceneStringNames::get_singleton()->_spatial_editor_group, SceneStringNames::get_singleton()->_clear_subgizmo_selection, this);
	}
#endif
}

void Spatial::add_gizmo(Ref<SpatialGizmo> p_gizmo) {
#ifdef TOOLS_ENABLED
	if (data.gizmos_disabled || p_gizmo.is_null()) {
		return;
	}

	data.gizmos.push_back(p_gizmo);

	if (p_gizmo.is_valid() && is_inside_world()) {
		p_gizmo->create();
		if (is_visible_in_tree()) {
			p_gizmo->redraw();
		}
		p_gizmo->transform();
	}
#endif
}

void Spatial::remove_gizmo(Ref<SpatialGizmo> p_gizmo) {
#ifdef TOOLS_ENABLED

	int idx = data.gizmos.find(p_gizmo);
	if (idx != -1) {
		p_gizmo->free();
		data.gizmos.remove(idx);
	}
#endif
}

void Spatial::clear_gizmos() {
#ifdef TOOLS_ENABLED
	for (int i = 0; i < data.gizmos.size(); i++) {
		data.gizmos.write[i]->free();
	}

	data.gizmos.clear();
#endif
}

Vector<Variant> Spatial::get_gizmos_bind() const {
	Vector<Variant> ret;

#ifdef TOOLS_ENABLED
	for (int i = 0; i < data.gizmos.size(); i++) {
		ret.push_back(data.gizmos[i].get_ref_ptr());
	}
#endif

	return ret;
}

Vector<Ref<SpatialGizmo>> Spatial::get_gizmos() const {
#ifdef TOOLS_ENABLED

	return data.gizmos;
#else

	return Vector<Ref<SpatialGizmo>>();
#endif
}

void Spatial::_update_gizmos() {
#ifdef TOOLS_ENABLED
	if (data.gizmos_disabled || !is_inside_world() || !data.gizmos_dirty) {
		return;
	}

	data.gizmos_dirty = false;
	for (int i = 0; i < data.gizmos.size(); i++) {
		if (is_visible_in_tree()) {
			data.gizmos.write[i]->redraw();
		} else {
			data.gizmos.write[i]->clear();
		}
	}
#endif
}

void Spatial::set_disable_gizmos(bool p_enabled) {
#ifdef TOOLS_ENABLED
	data.gizmos_disabled = p_enabled;

	if (!p_enabled) {
		clear_gizmos();
	}
#endif
}

void Spatial::set_disable_scale(bool p_enabled) {
	data.disable_scale = p_enabled;
}

bool Spatial::is_scale_disabled() const {
	return data.disable_scale;
}

void Spatial::set_as_toplevel(bool p_enabled) {
	if (data.toplevel == p_enabled) {
		return;
	}
	if (is_inside_tree() && !Engine::get_singleton()->is_editor_hint()) {
		if (p_enabled) {
			set_transform(get_global_transform());
		} else if (data.parent) {
			set_transform(data.parent->get_global_transform().affine_inverse() * get_global_transform());
		}

		data.toplevel = p_enabled;
		data.toplevel_active = p_enabled;

	} else {
		data.toplevel = p_enabled;
	}
}

bool Spatial::is_set_as_toplevel() const {
	return data.toplevel;
}

Ref<World3D> Spatial::get_world_3d() const {
	ERR_FAIL_COND_V(!is_inside_world(), Ref<World3D>());
	ERR_FAIL_COND_V(!get_world(), Ref<World3D>());

	return get_world()->find_world_3d();
}

void Spatial::_propagate_visibility_changed() {
	notification(NOTIFICATION_VISIBILITY_CHANGED);
	emit_signal(SceneStringNames::get_singleton()->visibility_changed);
	_change_notify("visible");

#ifdef TOOLS_ENABLED
	if (!data.gizmos.empty()) {
		data.gizmos_dirty = true;
		_update_gizmos();
	}
#endif

	for (List<Spatial *>::Element *E = data.children.front(); E; E = E->next()) {
		Spatial *c = E->get();
		if (!c || !c->data.visible) {
			continue;
		}
		c->_propagate_visibility_changed();
	}
}

void Spatial::_propagate_merging_allowed(bool p_merging_allowed) {
	switch (data.merging_mode) {
		case MERGING_MODE_INHERIT:
			// Keep the parent p_allow_merging.
			break;
		case MERGING_MODE_OFF: {
			p_merging_allowed = false;
		} break;
		case MERGING_MODE_ON: {
			p_merging_allowed = true;
		} break;
	}

	// No change? No need to propagate further.
	if (data.merging_allowed == p_merging_allowed) {
		return;
	}

	data.merging_allowed = p_merging_allowed;

	for (List<Spatial *>::Element *E = data.children.front(); E; E = E->next()) {
		Spatial *c = E->get();
		if (!c) {
			continue;
		}
		c->_propagate_merging_allowed(p_merging_allowed);
	}
}

void Spatial::show() {
	if (data.visible) {
		return;
	}

	data.visible = true;

	if (!is_inside_tree()) {
		return;
	}

	_propagate_visibility_changed();
}

void Spatial::hide() {
	if (!data.visible) {
		return;
	}

	data.visible = false;

	if (!is_inside_tree()) {
		return;
	}

	_propagate_visibility_changed();
}

bool Spatial::is_visible_in_tree() const {
	const Spatial *s = this;

	while (s) {
		if (!s->data.visible) {
			return false;
		}
		s = s->data.parent;
	}

	return true;
}

void Spatial::set_visible(bool p_visible) {
	if (p_visible) {
		show();
	} else {
		hide();
	}
}

bool Spatial::is_visible() const {
	return data.visible;
}

void Spatial::rotate_object_local(const Vector3 &p_axis, float p_angle) {
	Transform t = get_transform();
	t.basis.rotate_local(p_axis, p_angle);
	set_transform(t);
}

void Spatial::rotate(const Vector3 &p_axis, float p_angle) {
	Transform t = get_transform();
	t.basis.rotate(p_axis, p_angle);
	set_transform(t);
}

void Spatial::rotate_x(float p_angle) {
	Transform t = get_transform();
	t.basis.rotate(Vector3(1, 0, 0), p_angle);
	set_transform(t);
}

void Spatial::rotate_y(float p_angle) {
	Transform t = get_transform();
	t.basis.rotate(Vector3(0, 1, 0), p_angle);
	set_transform(t);
}
void Spatial::rotate_z(float p_angle) {
	Transform t = get_transform();
	t.basis.rotate(Vector3(0, 0, 1), p_angle);
	set_transform(t);
}

void Spatial::translate(const Vector3 &p_offset) {
	Transform t = get_transform();
	t.translate_local(p_offset);
	set_transform(t);
}

void Spatial::translate_object_local(const Vector3 &p_offset) {
	Transform t = get_transform();

	Transform s;
	s.translate_local(p_offset);
	set_transform(t * s);
}

void Spatial::scale(const Vector3 &p_ratio) {
	Transform t = get_transform();
	t.basis.scale(p_ratio);
	set_transform(t);
}

void Spatial::scale_object_local(const Vector3 &p_scale) {
	Transform t = get_transform();
	t.basis.scale_local(p_scale);
	set_transform(t);
}

void Spatial::global_rotate(const Vector3 &p_axis, float p_angle) {
	Transform t = get_global_transform();
	t.basis.rotate(p_axis, p_angle);
	set_global_transform(t);
}

void Spatial::global_scale(const Vector3 &p_scale) {
	Transform t = get_global_transform();
	t.basis.scale(p_scale);
	set_global_transform(t);
}

void Spatial::global_translate(const Vector3 &p_offset) {
	Transform t = get_global_transform();
	t.origin += p_offset;
	set_global_transform(t);
}

void Spatial::orthonormalize() {
	Transform t = get_transform();
	t.orthonormalize();
	set_transform(t);
}

void Spatial::set_identity() {
	set_transform(Transform());
}

void Spatial::look_at(const Vector3 &p_target, const Vector3 &p_up) {
	Vector3 origin(get_global_transform().origin);
	look_at_from_position(origin, p_target, p_up);
}

void Spatial::look_at_from_position(const Vector3 &p_pos, const Vector3 &p_target, const Vector3 &p_up) {
	ERR_FAIL_COND_MSG(p_pos == p_target, "Node origin and target are in the same position, look_at() failed.");
	ERR_FAIL_COND_MSG(p_up == Vector3(), "The up vector can't be zero, look_at() failed.");
	ERR_FAIL_COND_MSG(p_up.cross(p_target - p_pos) == Vector3(), "Up vector and direction between node origin and target are aligned, look_at() failed.");

	Transform lookat;
	lookat.origin = p_pos;

	Vector3 original_scale(get_scale());
	lookat = lookat.looking_at(p_target, p_up);
	set_global_transform(lookat);
	set_scale(original_scale);
}

Vector3 Spatial::to_local(Vector3 p_global) const {
	return get_global_transform().affine_inverse().xform(p_global);
}

Vector3 Spatial::to_global(Vector3 p_local) const {
	return get_global_transform().xform(p_local);
}

void Spatial::set_notify_transform(bool p_enable) {
	data.notify_transform = p_enable;
}

bool Spatial::is_transform_notification_enabled() const {
	return data.notify_transform;
}

void Spatial::set_notify_local_transform(bool p_enable) {
	data.notify_local_transform = p_enable;
}

bool Spatial::is_local_transform_notification_enabled() const {
	return data.notify_local_transform;
}

void Spatial::set_merging_mode(MergingMode p_mode) {
	if (data.merging_mode == p_mode) {
		return;
	}

	data.merging_mode = p_mode;

	bool merging_allowed = true; // Default for root node.

	switch (p_mode) {
		case MERGING_MODE_INHERIT: {
			if (get_parent_spatial()) {
				merging_allowed = get_parent_spatial()->is_merging_allowed();
			}
		} break;
		case MERGING_MODE_OFF: {
			merging_allowed = false;
		} break;
		case MERGING_MODE_ON: {
			merging_allowed = true;
		} break;
	}

	_propagate_merging_allowed(merging_allowed);
}

void Spatial::set_lod_range(float p_range) {
	data.lod_range = p_range;
}

void Spatial::force_update_transform() {
	ERR_FAIL_COND(!is_inside_tree());
	if (!xform_change.in_list()) {
		return; //nothing to update
	}
	get_tree()->xform_change_list.remove(&xform_change);

	notification(NOTIFICATION_TRANSFORM_CHANGED);
}

void Spatial::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_transform", "local"), &Spatial::set_transform);
	ClassDB::bind_method(D_METHOD("get_transform"), &Spatial::get_transform);
	ClassDB::bind_method(D_METHOD("set_translation", "translation"), &Spatial::set_translation);
	ClassDB::bind_method(D_METHOD("get_translation"), &Spatial::get_translation);
	ClassDB::bind_method(D_METHOD("set_rotation", "euler"), &Spatial::set_rotation);
	ClassDB::bind_method(D_METHOD("get_rotation"), &Spatial::get_rotation);
	ClassDB::bind_method(D_METHOD("set_rotation_degrees", "euler_degrees"), &Spatial::set_rotation_degrees);
	ClassDB::bind_method(D_METHOD("get_rotation_degrees"), &Spatial::get_rotation_degrees);
	ClassDB::bind_method(D_METHOD("set_scale", "scale"), &Spatial::set_scale);
	ClassDB::bind_method(D_METHOD("get_scale"), &Spatial::get_scale);

	ClassDB::bind_method(D_METHOD("set_global_transform", "global"), &Spatial::set_global_transform);
	ClassDB::bind_method(D_METHOD("get_global_transform"), &Spatial::get_global_transform);
	ClassDB::bind_method(D_METHOD("set_global_translation", "translation"), &Spatial::set_global_translation);
	ClassDB::bind_method(D_METHOD("get_global_translation"), &Spatial::get_global_translation);
	ClassDB::bind_method(D_METHOD("set_global_rotation", "radians"), &Spatial::set_global_rotation);
	ClassDB::bind_method(D_METHOD("get_global_rotation"), &Spatial::get_global_rotation);

	ClassDB::bind_method(D_METHOD("get_global_transform_interpolated"), &Spatial::get_global_transform_interpolated);
	ClassDB::bind_method(D_METHOD("get_parent_spatial"), &Spatial::get_parent_spatial);
	ClassDB::bind_method(D_METHOD("set_ignore_transform_notification", "enabled"), &Spatial::set_ignore_transform_notification);
	ClassDB::bind_method(D_METHOD("set_as_toplevel", "enable"), &Spatial::set_as_toplevel);
	ClassDB::bind_method(D_METHOD("is_set_as_toplevel"), &Spatial::is_set_as_toplevel);
	ClassDB::bind_method(D_METHOD("set_disable_scale", "disable"), &Spatial::set_disable_scale);
	ClassDB::bind_method(D_METHOD("is_scale_disabled"), &Spatial::is_scale_disabled);
	ClassDB::bind_method(D_METHOD("get_world_3d"), &Spatial::get_world_3d);

	ClassDB::bind_method(D_METHOD("force_update_transform"), &Spatial::force_update_transform);

	ClassDB::bind_method(D_METHOD("_update_gizmos"), &Spatial::_update_gizmos);

	ClassDB::bind_method(D_METHOD("update_gizmos"), &Spatial::update_gizmos);
	ClassDB::bind_method(D_METHOD("add_gizmo", "gizmo"), &Spatial::add_gizmo);
	ClassDB::bind_method(D_METHOD("get_gizmos"), &Spatial::get_gizmos_bind);
	ClassDB::bind_method(D_METHOD("clear_gizmos"), &Spatial::clear_gizmos);
	ClassDB::bind_method(D_METHOD("set_subgizmo_selection", "gizmo", "id", "transform"), &Spatial::set_subgizmo_selection);
	ClassDB::bind_method(D_METHOD("clear_subgizmo_selection"), &Spatial::clear_subgizmo_selection);

	ClassDB::bind_method(D_METHOD("set_visible", "visible"), &Spatial::set_visible);
	ClassDB::bind_method(D_METHOD("is_visible"), &Spatial::is_visible);
	ClassDB::bind_method(D_METHOD("is_visible_in_tree"), &Spatial::is_visible_in_tree);
	ClassDB::bind_method(D_METHOD("show"), &Spatial::show);
	ClassDB::bind_method(D_METHOD("hide"), &Spatial::hide);

	ClassDB::bind_method(D_METHOD("set_notify_local_transform", "enable"), &Spatial::set_notify_local_transform);
	ClassDB::bind_method(D_METHOD("is_local_transform_notification_enabled"), &Spatial::is_local_transform_notification_enabled);

	ClassDB::bind_method(D_METHOD("set_notify_transform", "enable"), &Spatial::set_notify_transform);
	ClassDB::bind_method(D_METHOD("is_transform_notification_enabled"), &Spatial::is_transform_notification_enabled);

	ClassDB::bind_method(D_METHOD("rotate", "axis", "angle"), &Spatial::rotate);
	ClassDB::bind_method(D_METHOD("global_rotate", "axis", "angle"), &Spatial::global_rotate);
	ClassDB::bind_method(D_METHOD("global_scale", "scale"), &Spatial::global_scale);
	ClassDB::bind_method(D_METHOD("global_translate", "offset"), &Spatial::global_translate);
	ClassDB::bind_method(D_METHOD("rotate_object_local", "axis", "angle"), &Spatial::rotate_object_local);
	ClassDB::bind_method(D_METHOD("scale_object_local", "scale"), &Spatial::scale_object_local);
	ClassDB::bind_method(D_METHOD("translate_object_local", "offset"), &Spatial::translate_object_local);
	ClassDB::bind_method(D_METHOD("rotate_x", "angle"), &Spatial::rotate_x);
	ClassDB::bind_method(D_METHOD("rotate_y", "angle"), &Spatial::rotate_y);
	ClassDB::bind_method(D_METHOD("rotate_z", "angle"), &Spatial::rotate_z);
	ClassDB::bind_method(D_METHOD("translate", "offset"), &Spatial::translate);
	ClassDB::bind_method(D_METHOD("orthonormalize"), &Spatial::orthonormalize);
	ClassDB::bind_method(D_METHOD("set_identity"), &Spatial::set_identity);

	ClassDB::bind_method(D_METHOD("look_at", "target", "up"), &Spatial::look_at);
	ClassDB::bind_method(D_METHOD("look_at_from_position", "position", "target", "up"), &Spatial::look_at_from_position);

	ClassDB::bind_method(D_METHOD("set_merging_mode", "mode"), &Spatial::set_merging_mode);
	ClassDB::bind_method(D_METHOD("get_merging_mode"), &Spatial::get_merging_mode);

	ClassDB::bind_method(D_METHOD("set_lod_range", "range"), &Spatial::set_lod_range);
	ClassDB::bind_method(D_METHOD("get_lod_range"), &Spatial::get_lod_range);

	ClassDB::bind_method(D_METHOD("to_local", "global_point"), &Spatial::to_local);
	ClassDB::bind_method(D_METHOD("to_global", "local_point"), &Spatial::to_global);

	BIND_CONSTANT(NOTIFICATION_TRANSFORM_CHANGED);
	BIND_CONSTANT(NOTIFICATION_ENTER_WORLD);
	BIND_CONSTANT(NOTIFICATION_EXIT_WORLD);
	BIND_CONSTANT(NOTIFICATION_VISIBILITY_CHANGED);
	BIND_CONSTANT(NOTIFICATION_ENTER_GAMEPLAY);
	BIND_CONSTANT(NOTIFICATION_EXIT_GAMEPLAY);

	BIND_ENUM_CONSTANT(MERGING_MODE_INHERIT);
	BIND_ENUM_CONSTANT(MERGING_MODE_OFF);
	BIND_ENUM_CONSTANT(MERGING_MODE_ON);

	ADD_GROUP("Transform", "");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3, "translation", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_EDITOR), "set_translation", "get_translation");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3, "rotation_degrees", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_EDITOR), "set_rotation_degrees", "get_rotation_degrees");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3, "rotation", PROPERTY_HINT_NONE, "", 0), "set_rotation", "get_rotation");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3, "scale", PROPERTY_HINT_LINK, "", PROPERTY_USAGE_EDITOR), "set_scale", "get_scale");
	ADD_PROPERTY(PropertyInfo(Variant::TRANSFORM, "global_transform", PROPERTY_HINT_NONE, "", 0), "set_global_transform", "get_global_transform");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3, "global_translation", PROPERTY_HINT_NONE, "", 0), "set_global_translation", "get_global_translation");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3, "global_rotation", PROPERTY_HINT_NONE, "", 0), "set_global_rotation", "get_global_rotation");

	ADD_GROUP("Matrix", "");
	ADD_PROPERTY(PropertyInfo(Variant::TRANSFORM, "transform", PROPERTY_HINT_NONE, ""), "set_transform", "get_transform");
	ADD_GROUP("Visibility", "");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "visible"), "set_visible", "is_visible");

	ADD_GROUP("Misc", "");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "lod_range", PROPERTY_HINT_RANGE, "0,1024,0.01,or_greater"), "set_lod_range", "get_lod_range");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "merging_mode", PROPERTY_HINT_ENUM, "Inherit,Off,On"), "set_merging_mode", "get_merging_mode");

	ADD_SIGNAL(MethodInfo("visibility_changed"));
	ADD_SIGNAL(MethodInfo("gameplay_entered"));
	ADD_SIGNAL(MethodInfo("gameplay_exited"));
}

Spatial::Spatial() :
		xform_change(this), _client_physics_interpolation_spatials_list(this) {
	data.dirty = DIRTY_NONE;
	data.children_lock = 0;

	data.ignore_notification = false;
	data.toplevel = false;
	data.toplevel_active = false;
	data.scale = Vector3(1, 1, 1);
	data.inside_world = false;
	data.visible = true;
	data.disable_scale = false;
	data.vi_visible = true;
	data.merging_allowed = true;
	data.merging_mode = MERGING_MODE_INHERIT;

	data.client_physics_interpolation_data = nullptr;

#ifdef TOOLS_ENABLED
	data.gizmos_disabled = false;
	data.gizmos_dirty = false;
	data.transform_gizmo_visible = true;
#endif
	data.notify_local_transform = false;
	data.notify_transform = false;
	data.parent = nullptr;
	data.C = nullptr;
}

Spatial::~Spatial() {
	_disable_client_physics_interpolation();
}