/*************************************************************************/
/*  skeleton.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 "skeleton.h"

#include "core/message_queue.h"

#include "core/project_settings.h"
#include "scene/3d/physics_body.h"
#include "scene/resources/surface_tool.h"

bool Skeleton::_set(const StringName &p_path, const Variant &p_value) {

	String path = p_path;

	if (!path.begins_with("bones/"))
		return false;

	int which = path.get_slicec('/', 1).to_int();
	String what = path.get_slicec('/', 2);

	if (which == bones.size() && what == "name") {

		add_bone(p_value);
		return true;
	}

	ERR_FAIL_INDEX_V(which, bones.size(), false);

	if (what == "parent")
		set_bone_parent(which, p_value);
	else if (what == "rest")
		set_bone_rest(which, p_value);
	else if (what == "enabled")
		set_bone_enabled(which, p_value);
	else if (what == "pose")
		set_bone_pose(which, p_value);
	else if (what == "bound_children") {
		Array children = p_value;

		if (is_inside_tree()) {
			bones.write[which].nodes_bound.clear();

			for (int i = 0; i < children.size(); i++) {

				NodePath path = children[i];
				ERR_CONTINUE(path.operator String() == "");
				Node *node = get_node(path);
				ERR_CONTINUE(!node);
				bind_child_node_to_bone(which, node);
			}
		}
	} else {
		return false;
	}

	return true;
}

bool Skeleton::_get(const StringName &p_path, Variant &r_ret) const {

	String path = p_path;

	if (!path.begins_with("bones/"))
		return false;

	int which = path.get_slicec('/', 1).to_int();
	String what = path.get_slicec('/', 2);

	ERR_FAIL_INDEX_V(which, bones.size(), false);

	if (what == "name")
		r_ret = get_bone_name(which);
	else if (what == "parent")
		r_ret = get_bone_parent(which);
	else if (what == "rest")
		r_ret = get_bone_rest(which);
	else if (what == "enabled")
		r_ret = is_bone_enabled(which);
	else if (what == "pose")
		r_ret = get_bone_pose(which);
	else if (what == "bound_children") {
		Array children;

		for (const List<uint32_t>::Element *E = bones[which].nodes_bound.front(); E; E = E->next()) {

			Object *obj = ObjectDB::get_instance(E->get());
			ERR_CONTINUE(!obj);
			Node *node = Object::cast_to<Node>(obj);
			ERR_CONTINUE(!node);
			NodePath path = get_path_to(node);
			children.push_back(path);
		}

		r_ret = children;
	} else
		return false;

	return true;
}
void Skeleton::_get_property_list(List<PropertyInfo> *p_list) const {

	for (int i = 0; i < bones.size(); i++) {

		String prep = "bones/" + itos(i) + "/";
		p_list->push_back(PropertyInfo(Variant::STRING, prep + "name"));
		p_list->push_back(PropertyInfo(Variant::INT, prep + "parent", PROPERTY_HINT_RANGE, "-1," + itos(bones.size() - 1) + ",1"));
		p_list->push_back(PropertyInfo(Variant::TRANSFORM, prep + "rest"));
		p_list->push_back(PropertyInfo(Variant::BOOL, prep + "enabled"));
		p_list->push_back(PropertyInfo(Variant::TRANSFORM, prep + "pose", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_EDITOR));
		p_list->push_back(PropertyInfo(Variant::ARRAY, prep + "bound_children"));
	}
}

void Skeleton::_update_process_order() {

	if (!process_order_dirty)
		return;

	Bone *bonesptr = bones.ptrw();
	int len = bones.size();

	process_order.resize(len);
	int *order = process_order.ptrw();
	for (int i = 0; i < len; i++) {

		if (bonesptr[i].parent >= len) {
			//validate this just in case
			ERR_PRINTS("Bone " + itos(i) + " has invalid parent: " + itos(bonesptr[i].parent));
			bonesptr[i].parent = -1;
		}
		order[i] = i;
		bonesptr[i].sort_index = i;
	}
	//now check process order
	int pass_count = 0;
	while (pass_count < len * len) {
		//using bubblesort because of simplicity, it wont run every frame though.
		//bublesort worst case is O(n^2), and this may be an infinite loop if cyclic
		bool swapped = false;
		for (int i = 0; i < len; i++) {
			int parent_idx = bonesptr[order[i]].parent;
			if (parent_idx < 0)
				continue; //do nothing because it has no parent
			//swap indices
			int parent_order = bonesptr[parent_idx].sort_index;
			if (parent_order > i) {
				bonesptr[order[i]].sort_index = parent_order;
				bonesptr[parent_idx].sort_index = i;
				//swap order
				SWAP(order[i], order[parent_order]);
				swapped = true;
			}
		}

		if (!swapped)
			break;
		pass_count++;
	}

	if (pass_count == len * len) {
		ERR_PRINT("Skeleton parenthood graph is cyclic");
	}

	process_order_dirty = false;
}

void Skeleton::_notification(int p_what) {

	switch (p_what) {

		case NOTIFICATION_ENTER_WORLD: {

			if (dirty) {

				dirty = false;
				_make_dirty(); // property make it dirty
			}

		} break;
		case NOTIFICATION_EXIT_WORLD: {

		} break;
		case NOTIFICATION_TRANSFORM_CHANGED: {

			if (dirty)
				break; //will be eventually updated

			//if moved, just update transforms
			VisualServer *vs = VisualServer::get_singleton();
			const Bone *bonesptr = bones.ptr();
			int len = bones.size();
			Transform global_transform = get_global_transform();
			Transform global_transform_inverse = global_transform.affine_inverse();

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

				const Bone &b = bonesptr[i];
				vs->skeleton_bone_set_transform(skeleton, i, global_transform * (b.transform_final * global_transform_inverse));
			}
		} break;
		case NOTIFICATION_UPDATE_SKELETON: {

			VisualServer *vs = VisualServer::get_singleton();
			Bone *bonesptr = bones.ptrw();
			int len = bones.size();

			vs->skeleton_allocate(skeleton, len); // if same size, nothing really happens

			_update_process_order();

			const int *order = process_order.ptr();

			// pose changed, rebuild cache of inverses
			if (rest_global_inverse_dirty) {

				// calculate global rests and invert them
				for (int i = 0; i < len; i++) {
					Bone &b = bonesptr[order[i]];
					if (b.parent >= 0)
						b.rest_global_inverse = bonesptr[b.parent].rest_global_inverse * b.rest;
					else
						b.rest_global_inverse = b.rest;
				}
				for (int i = 0; i < len; i++) {
					Bone &b = bonesptr[order[i]];
					b.rest_global_inverse.affine_invert();
				}

				rest_global_inverse_dirty = false;
			}

			Transform global_transform = get_global_transform();
			Transform global_transform_inverse = global_transform.affine_inverse();

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

				Bone &b = bonesptr[order[i]];

				if (b.disable_rest) {
					if (b.enabled) {

						Transform pose = b.pose;
						if (b.custom_pose_enable) {

							pose = b.custom_pose * pose;
						}

						if (b.parent >= 0) {

							b.pose_global = bonesptr[b.parent].pose_global * pose;
						} else {

							b.pose_global = pose;
						}
					} else {

						if (b.parent >= 0) {

							b.pose_global = bonesptr[b.parent].pose_global;
						} else {

							b.pose_global = Transform();
						}
					}

				} else {
					if (b.enabled) {

						Transform pose = b.pose;
						if (b.custom_pose_enable) {

							pose = b.custom_pose * pose;
						}

						if (b.parent >= 0) {

							b.pose_global = bonesptr[b.parent].pose_global * (b.rest * pose);
						} else {

							b.pose_global = b.rest * pose;
						}
					} else {

						if (b.parent >= 0) {

							b.pose_global = bonesptr[b.parent].pose_global * b.rest;
						} else {

							b.pose_global = b.rest;
						}
					}
				}

				b.transform_final = b.pose_global * b.rest_global_inverse;
				vs->skeleton_bone_set_transform(skeleton, order[i], global_transform * (b.transform_final * global_transform_inverse));

				for (List<uint32_t>::Element *E = b.nodes_bound.front(); E; E = E->next()) {

					Object *obj = ObjectDB::get_instance(E->get());
					ERR_CONTINUE(!obj);
					Spatial *sp = Object::cast_to<Spatial>(obj);
					ERR_CONTINUE(!sp);
					sp->set_transform(b.pose_global);
				}
			}

			dirty = false;
		} break;
	}
}

Transform Skeleton::get_bone_transform(int p_bone) const {
	ERR_FAIL_INDEX_V(p_bone, bones.size(), Transform());
	if (dirty)
		const_cast<Skeleton *>(this)->notification(NOTIFICATION_UPDATE_SKELETON);
	return bones[p_bone].pose_global * bones[p_bone].rest_global_inverse;
}

void Skeleton::set_bone_global_pose(int p_bone, const Transform &p_pose) {

	ERR_FAIL_INDEX(p_bone, bones.size());
	if (bones[p_bone].parent == -1) {

		set_bone_pose(p_bone, bones[p_bone].rest_global_inverse * p_pose); //fast
	} else {

		set_bone_pose(p_bone, bones[p_bone].rest.affine_inverse() * (get_bone_global_pose(bones[p_bone].parent).affine_inverse() * p_pose)); //slow
	}
}

Transform Skeleton::get_bone_global_pose(int p_bone) const {

	ERR_FAIL_INDEX_V(p_bone, bones.size(), Transform());
	if (dirty)
		const_cast<Skeleton *>(this)->notification(NOTIFICATION_UPDATE_SKELETON);
	return bones[p_bone].pose_global;
}

RID Skeleton::get_skeleton() const {

	return skeleton;
}

// skeleton creation api
void Skeleton::add_bone(const String &p_name) {

	ERR_FAIL_COND(p_name == "" || p_name.find(":") != -1 || p_name.find("/") != -1);

	for (int i = 0; i < bones.size(); i++) {

		ERR_FAIL_COND(bones[i].name == p_name);
	}

	Bone b;
	b.name = p_name;
	bones.push_back(b);
	process_order_dirty = true;

	rest_global_inverse_dirty = true;
	_make_dirty();
	update_gizmo();
}
int Skeleton::find_bone(const String &p_name) const {

	for (int i = 0; i < bones.size(); i++) {

		if (bones[i].name == p_name)
			return i;
	}

	return -1;
}
String Skeleton::get_bone_name(int p_bone) const {

	ERR_FAIL_INDEX_V(p_bone, bones.size(), "");

	return bones[p_bone].name;
}

bool Skeleton::is_bone_parent_of(int p_bone, int p_parent_bone_id) const {

	int parent_of_bone = get_bone_parent(p_bone);

	if (-1 == parent_of_bone)
		return false;

	if (parent_of_bone == p_parent_bone_id)
		return true;

	return is_bone_parent_of(parent_of_bone, p_parent_bone_id);
}

int Skeleton::get_bone_count() const {

	return bones.size();
}

void Skeleton::set_bone_parent(int p_bone, int p_parent) {

	ERR_FAIL_INDEX(p_bone, bones.size());
	ERR_FAIL_COND(p_parent != -1 && (p_parent < 0));

	bones.write[p_bone].parent = p_parent;
	rest_global_inverse_dirty = true;
	process_order_dirty = true;
	_make_dirty();
}

void Skeleton::unparent_bone_and_rest(int p_bone) {

	ERR_FAIL_INDEX(p_bone, bones.size());

	_update_process_order();

	int parent = bones[p_bone].parent;
	while (parent >= 0) {
		bones.write[p_bone].rest = bones[parent].rest * bones[p_bone].rest;
		parent = bones[parent].parent;
	}

	bones.write[p_bone].parent = -1;
	bones.write[p_bone].rest_global_inverse = bones[p_bone].rest.affine_inverse(); //same thing
	process_order_dirty = true;

	_make_dirty();
}

void Skeleton::set_bone_ignore_animation(int p_bone, bool p_ignore) {
	ERR_FAIL_INDEX(p_bone, bones.size());
	bones.write[p_bone].ignore_animation = p_ignore;
}

bool Skeleton::is_bone_ignore_animation(int p_bone) const {

	ERR_FAIL_INDEX_V(p_bone, bones.size(), false);
	return bones[p_bone].ignore_animation;
}

void Skeleton::set_bone_disable_rest(int p_bone, bool p_disable) {

	ERR_FAIL_INDEX(p_bone, bones.size());
	bones.write[p_bone].disable_rest = p_disable;
}

bool Skeleton::is_bone_rest_disabled(int p_bone) const {

	ERR_FAIL_INDEX_V(p_bone, bones.size(), false);
	return bones[p_bone].disable_rest;
}

int Skeleton::get_bone_parent(int p_bone) const {

	ERR_FAIL_INDEX_V(p_bone, bones.size(), -1);

	return bones[p_bone].parent;
}

void Skeleton::set_bone_rest(int p_bone, const Transform &p_rest) {

	ERR_FAIL_INDEX(p_bone, bones.size());

	bones.write[p_bone].rest = p_rest;
	rest_global_inverse_dirty = true;
	_make_dirty();
}
Transform Skeleton::get_bone_rest(int p_bone) const {

	ERR_FAIL_INDEX_V(p_bone, bones.size(), Transform());

	return bones[p_bone].rest;
}

void Skeleton::set_bone_enabled(int p_bone, bool p_enabled) {

	ERR_FAIL_INDEX(p_bone, bones.size());

	bones.write[p_bone].enabled = p_enabled;
	rest_global_inverse_dirty = true;
	_make_dirty();
}
bool Skeleton::is_bone_enabled(int p_bone) const {

	ERR_FAIL_INDEX_V(p_bone, bones.size(), false);
	return bones[p_bone].enabled;
}

void Skeleton::bind_child_node_to_bone(int p_bone, Node *p_node) {

	ERR_FAIL_NULL(p_node);
	ERR_FAIL_INDEX(p_bone, bones.size());

	uint32_t id = p_node->get_instance_id();

	for (const List<uint32_t>::Element *E = bones[p_bone].nodes_bound.front(); E; E = E->next()) {

		if (E->get() == id)
			return; // already here
	}

	bones.write[p_bone].nodes_bound.push_back(id);
}
void Skeleton::unbind_child_node_from_bone(int p_bone, Node *p_node) {

	ERR_FAIL_NULL(p_node);
	ERR_FAIL_INDEX(p_bone, bones.size());

	uint32_t id = p_node->get_instance_id();
	bones.write[p_bone].nodes_bound.erase(id);
}
void Skeleton::get_bound_child_nodes_to_bone(int p_bone, List<Node *> *p_bound) const {

	ERR_FAIL_INDEX(p_bone, bones.size());

	for (const List<uint32_t>::Element *E = bones[p_bone].nodes_bound.front(); E; E = E->next()) {

		Object *obj = ObjectDB::get_instance(E->get());
		ERR_CONTINUE(!obj);
		p_bound->push_back(Object::cast_to<Node>(obj));
	}
}

void Skeleton::clear_bones() {

	bones.clear();
	rest_global_inverse_dirty = true;
	process_order_dirty = true;

	_make_dirty();
}

// posing api

void Skeleton::set_bone_pose(int p_bone, const Transform &p_pose) {

	ERR_FAIL_INDEX(p_bone, bones.size());
	ERR_FAIL_COND(!is_inside_tree());

	bones.write[p_bone].pose = p_pose;
	_make_dirty();
}
Transform Skeleton::get_bone_pose(int p_bone) const {

	ERR_FAIL_INDEX_V(p_bone, bones.size(), Transform());
	return bones[p_bone].pose;
}

void Skeleton::set_bone_custom_pose(int p_bone, const Transform &p_custom_pose) {

	ERR_FAIL_INDEX(p_bone, bones.size());
	//ERR_FAIL_COND( !is_inside_scene() );

	bones.write[p_bone].custom_pose_enable = (p_custom_pose != Transform());
	bones.write[p_bone].custom_pose = p_custom_pose;

	_make_dirty();
}

Transform Skeleton::get_bone_custom_pose(int p_bone) const {

	ERR_FAIL_INDEX_V(p_bone, bones.size(), Transform());
	return bones[p_bone].custom_pose;
}

void Skeleton::_make_dirty() {

	if (dirty)
		return;

	if (!is_inside_tree()) {
		dirty = true;
		return;
	}
	MessageQueue::get_singleton()->push_notification(this, NOTIFICATION_UPDATE_SKELETON);
	dirty = true;
}

int Skeleton::get_process_order(int p_idx) {
	ERR_FAIL_INDEX_V(p_idx, bones.size(), -1);
	_update_process_order();
	return process_order[p_idx];
}

void Skeleton::localize_rests() {

	_update_process_order();

	for (int i = bones.size() - 1; i >= 0; i--) {
		int idx = process_order[i];
		if (bones[idx].parent >= 0) {
			set_bone_rest(idx, bones[bones[idx].parent].rest.affine_inverse() * bones[idx].rest);
		}
	}
}

#ifndef _3D_DISABLED

void Skeleton::bind_physical_bone_to_bone(int p_bone, PhysicalBone *p_physical_bone) {
	ERR_FAIL_INDEX(p_bone, bones.size());
	ERR_FAIL_COND(bones[p_bone].physical_bone);
	ERR_FAIL_COND(!p_physical_bone);
	bones.write[p_bone].physical_bone = p_physical_bone;

	_rebuild_physical_bones_cache();
}

void Skeleton::unbind_physical_bone_from_bone(int p_bone) {
	ERR_FAIL_INDEX(p_bone, bones.size());
	bones.write[p_bone].physical_bone = NULL;

	_rebuild_physical_bones_cache();
}

PhysicalBone *Skeleton::get_physical_bone(int p_bone) {
	ERR_FAIL_INDEX_V(p_bone, bones.size(), NULL);

	return bones[p_bone].physical_bone;
}

PhysicalBone *Skeleton::get_physical_bone_parent(int p_bone) {
	ERR_FAIL_INDEX_V(p_bone, bones.size(), NULL);

	if (bones[p_bone].cache_parent_physical_bone) {
		return bones[p_bone].cache_parent_physical_bone;
	}

	return _get_physical_bone_parent(p_bone);
}

PhysicalBone *Skeleton::_get_physical_bone_parent(int p_bone) {
	ERR_FAIL_INDEX_V(p_bone, bones.size(), NULL);

	const int parent_bone = bones[p_bone].parent;
	if (0 > parent_bone) {
		return NULL;
	}

	PhysicalBone *pb = bones[parent_bone].physical_bone;
	if (pb) {
		return pb;
	} else {
		return get_physical_bone_parent(parent_bone);
	}
}

void Skeleton::_rebuild_physical_bones_cache() {
	const int b_size = bones.size();
	for (int i = 0; i < b_size; ++i) {
		PhysicalBone *parent_pb = _get_physical_bone_parent(i);
		if (parent_pb != bones[i].physical_bone) {
			bones.write[i].cache_parent_physical_bone = parent_pb;
			if (bones[i].physical_bone)
				bones[i].physical_bone->_on_bone_parent_changed();
		}
	}
}

void _pb_stop_simulation(Node *p_node) {

	for (int i = p_node->get_child_count() - 1; 0 <= i; --i) {
		_pb_stop_simulation(p_node->get_child(i));
	}

	PhysicalBone *pb = Object::cast_to<PhysicalBone>(p_node);
	if (pb) {
		pb->set_simulate_physics(false);
		pb->set_static_body(false);
	}
}

void Skeleton::physical_bones_stop_simulation() {
	_pb_stop_simulation(this);
}

void _pb_start_simulation(const Skeleton *p_skeleton, Node *p_node, const Vector<int> &p_sim_bones) {

	for (int i = p_node->get_child_count() - 1; 0 <= i; --i) {
		_pb_start_simulation(p_skeleton, p_node->get_child(i), p_sim_bones);
	}

	PhysicalBone *pb = Object::cast_to<PhysicalBone>(p_node);
	if (pb) {
		bool sim = false;
		for (int i = p_sim_bones.size() - 1; 0 <= i; --i) {
			if (p_sim_bones[i] == pb->get_bone_id() || p_skeleton->is_bone_parent_of(pb->get_bone_id(), p_sim_bones[i])) {
				sim = true;
				break;
			}
		}

		pb->set_simulate_physics(true);
		if (sim) {
			pb->set_static_body(false);
		} else {
			pb->set_static_body(true);
		}
	}
}

void Skeleton::physical_bones_start_simulation_on(const Array &p_bones) {

	Vector<int> sim_bones;
	if (p_bones.size() <= 0) {
		sim_bones.push_back(0); // if no bones is specified, activate ragdoll on full body
	} else {
		sim_bones.resize(p_bones.size());
		int c = 0;
		for (int i = sim_bones.size() - 1; 0 <= i; --i) {
			if (Variant::STRING == p_bones.get(i).get_type()) {
				int bone_id = find_bone(p_bones.get(i));
				if (bone_id != -1)
					sim_bones.write[c++] = bone_id;
			}
		}
		sim_bones.resize(c);
	}

	_pb_start_simulation(this, this, sim_bones);
}

void _physical_bones_add_remove_collision_exception(bool p_add, Node *p_node, RID p_exception) {

	for (int i = p_node->get_child_count() - 1; 0 <= i; --i) {
		_physical_bones_add_remove_collision_exception(p_add, p_node->get_child(i), p_exception);
	}

	CollisionObject *co = Object::cast_to<CollisionObject>(p_node);
	if (co) {
		if (p_add) {
			PhysicsServer::get_singleton()->body_add_collision_exception(co->get_rid(), p_exception);
		} else {
			PhysicsServer::get_singleton()->body_remove_collision_exception(co->get_rid(), p_exception);
		}
	}
}

void Skeleton::physical_bones_add_collision_exception(RID p_exception) {
	_physical_bones_add_remove_collision_exception(true, this, p_exception);
}

void Skeleton::physical_bones_remove_collision_exception(RID p_exception) {
	_physical_bones_add_remove_collision_exception(false, this, p_exception);
}

#endif // _3D_DISABLED

void Skeleton::_bind_methods() {

	ClassDB::bind_method(D_METHOD("add_bone", "name"), &Skeleton::add_bone);
	ClassDB::bind_method(D_METHOD("find_bone", "name"), &Skeleton::find_bone);
	ClassDB::bind_method(D_METHOD("get_bone_name", "bone_idx"), &Skeleton::get_bone_name);

	ClassDB::bind_method(D_METHOD("get_bone_parent", "bone_idx"), &Skeleton::get_bone_parent);
	ClassDB::bind_method(D_METHOD("set_bone_parent", "bone_idx", "parent_idx"), &Skeleton::set_bone_parent);

	ClassDB::bind_method(D_METHOD("get_bone_count"), &Skeleton::get_bone_count);

	ClassDB::bind_method(D_METHOD("unparent_bone_and_rest", "bone_idx"), &Skeleton::unparent_bone_and_rest);

	ClassDB::bind_method(D_METHOD("get_bone_rest", "bone_idx"), &Skeleton::get_bone_rest);
	ClassDB::bind_method(D_METHOD("set_bone_rest", "bone_idx", "rest"), &Skeleton::set_bone_rest);

	ClassDB::bind_method(D_METHOD("set_bone_disable_rest", "bone_idx", "disable"), &Skeleton::set_bone_disable_rest);
	ClassDB::bind_method(D_METHOD("is_bone_rest_disabled", "bone_idx"), &Skeleton::is_bone_rest_disabled);

	ClassDB::bind_method(D_METHOD("bind_child_node_to_bone", "bone_idx", "node"), &Skeleton::bind_child_node_to_bone);
	ClassDB::bind_method(D_METHOD("unbind_child_node_from_bone", "bone_idx", "node"), &Skeleton::unbind_child_node_from_bone);
	ClassDB::bind_method(D_METHOD("get_bound_child_nodes_to_bone", "bone_idx"), &Skeleton::_get_bound_child_nodes_to_bone);

	ClassDB::bind_method(D_METHOD("clear_bones"), &Skeleton::clear_bones);

	ClassDB::bind_method(D_METHOD("get_bone_pose", "bone_idx"), &Skeleton::get_bone_pose);
	ClassDB::bind_method(D_METHOD("set_bone_pose", "bone_idx", "pose"), &Skeleton::set_bone_pose);

	ClassDB::bind_method(D_METHOD("set_bone_global_pose", "bone_idx", "pose"), &Skeleton::set_bone_global_pose);
	ClassDB::bind_method(D_METHOD("get_bone_global_pose", "bone_idx"), &Skeleton::get_bone_global_pose);

	ClassDB::bind_method(D_METHOD("get_bone_custom_pose", "bone_idx"), &Skeleton::get_bone_custom_pose);
	ClassDB::bind_method(D_METHOD("set_bone_custom_pose", "bone_idx", "custom_pose"), &Skeleton::set_bone_custom_pose);

	ClassDB::bind_method(D_METHOD("get_bone_transform", "bone_idx"), &Skeleton::get_bone_transform);

#ifndef _3D_DISABLED

	ClassDB::bind_method(D_METHOD("physical_bones_stop_simulation"), &Skeleton::physical_bones_stop_simulation);
	ClassDB::bind_method(D_METHOD("physical_bones_start_simulation", "bones"), &Skeleton::physical_bones_start_simulation_on, DEFVAL(Array()));
	ClassDB::bind_method(D_METHOD("physical_bones_add_collision_exception", "exception"), &Skeleton::physical_bones_add_collision_exception);
	ClassDB::bind_method(D_METHOD("physical_bones_remove_collision_exception", "exception"), &Skeleton::physical_bones_remove_collision_exception);

#endif // _3D_DISABLED

	ClassDB::bind_method(D_METHOD("set_bone_ignore_animation", "bone", "ignore"), &Skeleton::set_bone_ignore_animation);

	BIND_CONSTANT(NOTIFICATION_UPDATE_SKELETON);
}

Skeleton::Skeleton() {

	rest_global_inverse_dirty = true;
	dirty = false;
	process_order_dirty = true;
	skeleton = VisualServer::get_singleton()->skeleton_create();
	set_notify_transform(true);
}

Skeleton::~Skeleton() {
	VisualServer::get_singleton()->free(skeleton);
}