/*************************************************************************/
/*  scene_main_loop.cpp                                                  */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2016 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 "scene_main_loop.h"

#include "print_string.h"
#include "os/os.h"
#include "message_queue.h"
#include "node.h"
#include "globals.h"
#include <stdio.h>
#include "os/keyboard.h"
#include "servers/spatial_sound_2d_server.h"
#include "servers/physics_2d_server.h"
#include "servers/physics_server.h"
#include "scene/scene_string_names.h"
#include "io/resource_loader.h"
#include "viewport.h"
#include "scene/resources/packed_scene.h"
#include "scene/resources/material.h"
#include "scene/resources/mesh.h"


void SceneTreeTimer::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("set_time_left","time"),&SceneTreeTimer::set_time_left);
	ObjectTypeDB::bind_method(_MD("get_time_left"),&SceneTreeTimer::get_time_left);

	ADD_SIGNAL(MethodInfo("timeout"));
}


void SceneTreeTimer::set_time_left(float p_time) {
	time_left=p_time;
}

float SceneTreeTimer::get_time_left() const {
	return time_left;
}


SceneTreeTimer::SceneTreeTimer() {
	time_left=0;
}


void SceneTree::tree_changed() {

	tree_version++;
	emit_signal(tree_changed_name);
}

void SceneTree::node_removed(Node *p_node) {

	if (current_scene==p_node) {
		current_scene=NULL;
	}
	emit_signal(node_removed_name,p_node);
	if (call_lock>0)
		call_skip.insert(p_node);


}


SceneTree::Group *SceneTree::add_to_group(const StringName& p_group, Node *p_node) {

	Map<StringName,Group>::Element *E=group_map.find(p_group);
	if (!E) {
		E=group_map.insert(p_group,Group());
	}

	if (E->get().nodes.find(p_node)!=-1) {
		ERR_EXPLAIN("Already in group: "+p_group);
		ERR_FAIL_V(&E->get());
	}
	E->get().nodes.push_back(p_node);
	//E->get().last_tree_version=0;
	E->get().changed=true;
	return &E->get();
}

void SceneTree::remove_from_group(const StringName& p_group, Node *p_node) {

	Map<StringName,Group>::Element *E=group_map.find(p_group);
	ERR_FAIL_COND(!E);


	E->get().nodes.erase(p_node);
	if (E->get().nodes.empty())
		group_map.erase(E);
}

void SceneTree::_flush_transform_notifications() {

	SelfList<Node>* n = xform_change_list.first();
	while(n) {

		Node *node=n->self();
		SelfList<Node>* nx = n->next();
		xform_change_list.remove(n);
		n=nx;
		node->notification(NOTIFICATION_TRANSFORM_CHANGED);
	}
}

void SceneTree::_flush_ugc() {

	ugc_locked=true;

	while (unique_group_calls.size()) {

		Map<UGCall,Vector<Variant> >::Element *E=unique_group_calls.front();

		Variant v[VARIANT_ARG_MAX];
		for(int i=0;i<E->get().size();i++)
			v[i]=E->get()[i];

		call_group(GROUP_CALL_REALTIME,E->key().group,E->key().call,v[0],v[1],v[2],v[3],v[4]);

		unique_group_calls.erase(E);
	}

	ugc_locked=false;
}

void SceneTree::_update_group_order(Group& g) {

	if (!g.changed)
		return;
	if (g.nodes.empty())
		return;

	Node **nodes = &g.nodes[0];
	int node_count=g.nodes.size();

	SortArray<Node*,Node::Comparator> node_sort;
	node_sort.sort(nodes,node_count);
	g.changed=false;

}


void SceneTree::call_group(uint32_t p_call_flags,const StringName& p_group,const StringName& p_function,VARIANT_ARG_DECLARE) {

	Map<StringName,Group>::Element *E=group_map.find(p_group);
	if (!E)
		return;
	Group &g=E->get();
	if (g.nodes.empty())
		return;


	if (p_call_flags&GROUP_CALL_UNIQUE && !(p_call_flags&GROUP_CALL_REALTIME)) {

		ERR_FAIL_COND(ugc_locked);

		UGCall ug;
		ug.call=p_function;
		ug.group=p_group;

		if (unique_group_calls.has(ug))
			return;

		VARIANT_ARGPTRS;

		Vector<Variant> args;
		for(int i=0;i<VARIANT_ARG_MAX;i++) {
			if (argptr[i]->get_type()==Variant::NIL)
				break;
			args.push_back(*argptr[i]);
		}

		unique_group_calls[ug]=args;
		return;
	}

	_update_group_order(g);

	Vector<Node*> nodes_copy = g.nodes;
	Node **nodes = &nodes_copy[0];
	int node_count=nodes_copy.size();

	call_lock++;

	if (p_call_flags&GROUP_CALL_REVERSE) {

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

			if (call_lock && call_skip.has(nodes[i]))
				continue;

			if (p_call_flags&GROUP_CALL_REALTIME) {
				if (p_call_flags&GROUP_CALL_MULIILEVEL)
					nodes[i]->call_multilevel(p_function,VARIANT_ARG_PASS);
				else
					nodes[i]->call(p_function,VARIANT_ARG_PASS);
			} else
				MessageQueue::get_singleton()->push_call(nodes[i],p_function,VARIANT_ARG_PASS);

		}

	} else {

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

			if (call_lock && call_skip.has(nodes[i]))
				continue;

			if (p_call_flags&GROUP_CALL_REALTIME) {
				if (p_call_flags&GROUP_CALL_MULIILEVEL)
					nodes[i]->call_multilevel(p_function,VARIANT_ARG_PASS);
				else
					nodes[i]->call(p_function,VARIANT_ARG_PASS);
			} else
				MessageQueue::get_singleton()->push_call(nodes[i],p_function,VARIANT_ARG_PASS);
		}

	}

	call_lock--;
	if (call_lock==0)
		call_skip.clear();
}

void SceneTree::notify_group(uint32_t p_call_flags,const StringName& p_group,int p_notification) {

	Map<StringName,Group>::Element *E=group_map.find(p_group);
	if (!E)
		return;
	Group &g=E->get();
	if (g.nodes.empty())
		return;

	_update_group_order(g);

	Vector<Node*> nodes_copy = g.nodes;
	Node **nodes = &nodes_copy[0];
	int node_count=nodes_copy.size();

	call_lock++;

	if (p_call_flags&GROUP_CALL_REVERSE) {

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

			if (call_lock && call_skip.has(nodes[i]))
				continue;

			if (p_call_flags&GROUP_CALL_REALTIME)
				nodes[i]->notification(p_notification);
			else
				MessageQueue::get_singleton()->push_notification(nodes[i],p_notification);
		}

	} else {

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

			if (call_lock && call_skip.has(nodes[i]))
				continue;

			if (p_call_flags&GROUP_CALL_REALTIME)
				nodes[i]->notification(p_notification);
			else
				MessageQueue::get_singleton()->push_notification(nodes[i],p_notification);
		}

	}

	call_lock--;
	if (call_lock==0)
		call_skip.clear();
}

void SceneTree::set_group(uint32_t p_call_flags,const StringName& p_group,const String& p_name,const Variant& p_value) {

	Map<StringName,Group>::Element *E=group_map.find(p_group);
	if (!E)
		return;
	Group &g=E->get();
	if (g.nodes.empty())
		return;

	_update_group_order(g);

	Vector<Node*> nodes_copy = g.nodes;
	Node **nodes = &nodes_copy[0];
	int node_count=nodes_copy.size();

	call_lock++;

	if (p_call_flags&GROUP_CALL_REVERSE) {

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

			if (call_lock && call_skip.has(nodes[i]))
				continue;

			if (p_call_flags&GROUP_CALL_REALTIME)
				nodes[i]->set(p_name,p_value);
			else
				MessageQueue::get_singleton()->push_set(nodes[i],p_name,p_value);
		}

	} else {

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

			if (call_lock && call_skip.has(nodes[i]))
				continue;

			if (p_call_flags&GROUP_CALL_REALTIME)
				nodes[i]->set(p_name,p_value);
			else
				MessageQueue::get_singleton()->push_set(nodes[i],p_name,p_value);
		}

	}

	call_lock--;
	if (call_lock==0)
		call_skip.clear();
}

void SceneTree::set_input_as_handled() {

	input_handled=true;
}

void SceneTree::input_text( const String& p_text ) {

	root_lock++;

	call_group(GROUP_CALL_REALTIME,"_viewports","_vp_input_text",p_text); //special one for GUI, as controls use their own process check

	root_lock--;

}

void SceneTree::input_event( const InputEvent& p_event ) {


	if (is_editor_hint() && (p_event.type==InputEvent::JOYSTICK_MOTION || p_event.type==InputEvent::JOYSTICK_BUTTON))
		return; //avoid joy input on editor

	root_lock++;
	//last_id=p_event.ID;

	input_handled=false;


	InputEvent ev = p_event;
	ev.ID=++last_id; //this should work better
#if 0
	switch(ev.type) {

		case InputEvent::MOUSE_BUTTON: {

			Matrix32 ai = root->get_final_transform().affine_inverse();
			Vector2 g = ai.xform(Vector2(ev.mouse_button.global_x,ev.mouse_button.global_y));
			Vector2 l = ai.xform(Vector2(ev.mouse_button.x,ev.mouse_button.y));
			ev.mouse_button.x=l.x;
			ev.mouse_button.y=l.y;
			ev.mouse_button.global_x=g.x;
			ev.mouse_button.global_y=g.y;

		} break;
		case InputEvent::MOUSE_MOTION: {

			Matrix32 ai = root->get_final_transform().affine_inverse();
			Vector2 g = ai.xform(Vector2(ev.mouse_motion.global_x,ev.mouse_motion.global_y));
			Vector2 l = ai.xform(Vector2(ev.mouse_motion.x,ev.mouse_motion.y));
			Vector2 r = ai.xform(Vector2(ev.mouse_motion.relative_x,ev.mouse_motion.relative_y));
			ev.mouse_motion.x=l.x;
			ev.mouse_motion.y=l.y;
			ev.mouse_motion.global_x=g.x;
			ev.mouse_motion.global_y=g.y;
			ev.mouse_motion.relative_x=r.x;
			ev.mouse_motion.relative_y=r.y;

		} break;
		case InputEvent::SCREEN_TOUCH: {

			Matrix32 ai = root->get_final_transform().affine_inverse();
			Vector2 t = ai.xform(Vector2(ev.screen_touch.x,ev.screen_touch.y));
			ev.screen_touch.x=t.x;
			ev.screen_touch.y=t.y;

		} break;
		case InputEvent::SCREEN_DRAG: {

			Matrix32 ai = root->get_final_transform().affine_inverse();
			Vector2 t = ai.xform(Vector2(ev.screen_drag.x,ev.screen_drag.y));
			Vector2 r = ai.xform(Vector2(ev.screen_drag.relative_x,ev.screen_drag.relative_y));
			Vector2 s = ai.xform(Vector2(ev.screen_drag.speed_x,ev.screen_drag.speed_y));
			ev.screen_drag.x=t.x;
			ev.screen_drag.y=t.y;
			ev.screen_drag.relative_x=r.x;
			ev.screen_drag.relative_y=r.y;
			ev.screen_drag.speed_x=s.x;
			ev.screen_drag.speed_y=s.y;
		} break;
	}

#endif

	MainLoop::input_event(ev);
#if 0
	_call_input_pause("input","_input",ev);

	call_group(GROUP_CALL_REVERSE|GROUP_CALL_REALTIME|GROUP_CALL_MULIILEVEL,"_gui_input","_gui_input",p_event); //special one for GUI, as controls use their own process check

	//call_group(GROUP_CALL_REVERSE|GROUP_CALL_REALTIME|GROUP_CALL_MULIILEVEL,"input","_input",ev);

	/*if (ev.type==InputEvent::KEY && ev.key.pressed && !ev.key.echo && ev.key.scancode==KEY_F12) {

		print_line("RAM: "+itos(Memory::get_static_mem_usage()));
		print_line("DRAM: "+itos(Memory::get_dynamic_mem_usage()));
	}
*/
	//if (ev.type==InputEvent::KEY && ev.key.pressed && !ev.key.echo && ev.key.scancode==KEY_F11) {

	//	Memory::dump_static_mem_to_file("memdump.txt");
	//}

	//transform for the rest
#else

	call_group(GROUP_CALL_REALTIME,"_viewports","_vp_input",ev); //special one for GUI, as controls use their own process check

#endif
	if (ScriptDebugger::get_singleton() && ScriptDebugger::get_singleton()->is_remote() && ev.type==InputEvent::KEY && ev.key.pressed && !ev.key.echo && ev.key.scancode==KEY_F8) {

		ScriptDebugger::get_singleton()->request_quit();
	}

	_flush_ugc();
	root_lock--;
	MessageQueue::get_singleton()->flush(); //small little hack

	root_lock++;

	if (!input_handled) {

#if 0
		_call_input_pause("unhandled_input","_unhandled_input",ev);
		//call_group(GROUP_CALL_REVERSE|GROUP_CALL_REALTIME|GROUP_CALL_MULIILEVEL,"unhandled_input","_unhandled_input",ev);
		if (!input_handled && ev.type==InputEvent::KEY) {
			_call_input_pause("unhandled_key_input","_unhandled_key_input",ev);
			//call_group(GROUP_CALL_REVERSE|GROUP_CALL_REALTIME|GROUP_CALL_MULIILEVEL,"unhandled_key_input","_unhandled_key_input",ev);
		}
#else

		call_group(GROUP_CALL_REALTIME,"_viewports","_vp_unhandled_input",ev); //special one for GUI, as controls use their own process check

#endif
		input_handled=true;
		_flush_ugc();
		root_lock--;
		MessageQueue::get_singleton()->flush(); //small little hack
	} else {
		input_handled=true;
		root_lock--;

	}

}

void SceneTree::init() {

	//_quit=false;
	accept_quit=true;
	initialized=true;
	input_handled=false;


	pause=false;

	root->_set_tree(this);
	MainLoop::init();

}

bool SceneTree::iteration(float p_time) {


	root_lock++;

	current_frame++;

	_flush_transform_notifications();

	MainLoop::iteration(p_time);
	fixed_process_time=p_time;

	emit_signal("fixed_frame");

	_notify_group_pause("fixed_process",Node::NOTIFICATION_FIXED_PROCESS);
	_flush_ugc();
	_flush_transform_notifications();
	call_group(GROUP_CALL_REALTIME,"_viewports","update_worlds");
	root_lock--;

	_flush_delete_queue();

	return _quit;
}

bool SceneTree::idle(float p_time){


//	print_line("ram: "+itos(OS::get_singleton()->get_static_memory_usage())+" sram: "+itos(OS::get_singleton()->get_dynamic_memory_usage()));
//	print_line("node count: "+itos(get_node_count()));
//	print_line("TEXTURE RAM: "+itos(VS::get_singleton()->get_render_info(VS::INFO_TEXTURE_MEM_USED)));

	root_lock++;

	MainLoop::idle(p_time);

	idle_process_time=p_time;

	_network_poll();

	emit_signal("idle_frame");

	_flush_transform_notifications();

	_notify_group_pause("idle_process",Node::NOTIFICATION_PROCESS);

	Size2 win_size=Size2( OS::get_singleton()->get_video_mode().width, OS::get_singleton()->get_video_mode().height );
	if(win_size!=last_screen_size) {


		last_screen_size=win_size;
		_update_root_rect();


		emit_signal("screen_resized");

	}

	_flush_ugc();
	_flush_transform_notifications(); //transforms after world update, to avoid unnecesary enter/exit notifications
	call_group(GROUP_CALL_REALTIME,"_viewports","update_worlds");

	root_lock--;

	_flush_delete_queue();

	//go through timers

	for (List<Ref<SceneTreeTimer> >::Element *E=timers.front();E;) {

		List<Ref<SceneTreeTimer> >::Element *N = E->next();

		float time_left = E->get()->get_time_left();
		time_left-=p_time;
		E->get()->set_time_left(time_left);

		if (time_left<0) {
			E->get()->emit_signal("timeout");
			timers.erase(E);
		}
		E=N;
	}

	return _quit;
}

void SceneTree::finish() {

	_flush_delete_queue();

	_flush_ugc();

	initialized=false;

	MainLoop::finish();

	if (root) {
		root->_set_tree(NULL);
		memdelete(root); //delete root
	}









}


void SceneTree::quit() {

	_quit=true;
}

void SceneTree::_notification(int p_notification) {



	switch (p_notification) {

		case NOTIFICATION_WM_QUIT_REQUEST: {

			get_root()->propagate_notification(p_notification);

			if (accept_quit) {
				_quit=true;
				break;
			}
		} break;
		case NOTIFICATION_OS_MEMORY_WARNING:
		case NOTIFICATION_WM_FOCUS_IN:
		case NOTIFICATION_WM_FOCUS_OUT: {

			get_root()->propagate_notification(p_notification);
		} break;
		case NOTIFICATION_WM_UNFOCUS_REQUEST: {

			notify_group(GROUP_CALL_REALTIME|GROUP_CALL_MULIILEVEL,"input",NOTIFICATION_WM_UNFOCUS_REQUEST);

		} break;

		default:
			break;
	};
};


void SceneTree::set_auto_accept_quit(bool p_enable) {

	accept_quit=p_enable;
}

void SceneTree::set_editor_hint(bool p_enabled) {

	editor_hint=p_enabled;
}

bool SceneTree::is_node_being_edited(const Node* p_node) const {
#ifdef TOOLS_ENABLED
	return editor_hint && edited_scene_root && edited_scene_root->is_a_parent_of(p_node);
#else
	return false;
#endif
}

bool SceneTree::is_editor_hint() const {

	return editor_hint;
}

void SceneTree::set_debug_collisions_hint(bool p_enabled) {

	debug_collisions_hint=p_enabled;
}

bool SceneTree::is_debugging_collisions_hint() const {

	return debug_collisions_hint;
}

void SceneTree::set_debug_navigation_hint(bool p_enabled) {

	debug_navigation_hint=p_enabled;
}

bool SceneTree::is_debugging_navigation_hint() const {

	return debug_navigation_hint;
}

void SceneTree::set_debug_collisions_color(const Color& p_color) {

	debug_collisions_color=p_color;
}

Color SceneTree::get_debug_collisions_color() const {

	return debug_collisions_color;
}

void SceneTree::set_debug_collision_contact_color(const Color& p_color) {

	debug_collision_contact_color=p_color;
}

Color SceneTree::get_debug_collision_contact_color() const {

	return debug_collision_contact_color;
}

void SceneTree::set_debug_navigation_color(const Color& p_color) {

	debug_navigation_color=p_color;
}

Color SceneTree::get_debug_navigation_color() const {

	return debug_navigation_color;
}

void SceneTree::set_debug_navigation_disabled_color(const Color& p_color) {

	debug_navigation_disabled_color=p_color;
}

Color SceneTree::get_debug_navigation_disabled_color() const {

	return debug_navigation_disabled_color;
}

Ref<Material> SceneTree::get_debug_navigation_material() {

	if (navigation_material.is_valid())
		return navigation_material;

	Ref<FixedMaterial> line_material = Ref<FixedMaterial>( memnew( FixedMaterial ));
	line_material->set_flag(Material::FLAG_UNSHADED, true);
	line_material->set_line_width(3.0);
	line_material->set_fixed_flag(FixedMaterial::FLAG_USE_ALPHA, true);
	line_material->set_fixed_flag(FixedMaterial::FLAG_USE_COLOR_ARRAY, true);
	line_material->set_parameter(FixedMaterial::PARAM_DIFFUSE,get_debug_navigation_color());

	navigation_material=line_material;

	return navigation_material;

}

Ref<Material> SceneTree::get_debug_navigation_disabled_material(){

	if (navigation_disabled_material.is_valid())
		return navigation_disabled_material;

	Ref<FixedMaterial> line_material = Ref<FixedMaterial>( memnew( FixedMaterial ));
	line_material->set_flag(Material::FLAG_UNSHADED, true);
	line_material->set_line_width(3.0);
	line_material->set_fixed_flag(FixedMaterial::FLAG_USE_ALPHA, true);
	line_material->set_fixed_flag(FixedMaterial::FLAG_USE_COLOR_ARRAY, true);
	line_material->set_parameter(FixedMaterial::PARAM_DIFFUSE,get_debug_navigation_disabled_color());

	navigation_disabled_material=line_material;

	return navigation_disabled_material;

}
Ref<Material> SceneTree::get_debug_collision_material() {

	if (collision_material.is_valid())
		return collision_material;


	Ref<FixedMaterial> line_material = Ref<FixedMaterial>( memnew( FixedMaterial ));
	line_material->set_flag(Material::FLAG_UNSHADED, true);
	line_material->set_line_width(3.0);
	line_material->set_fixed_flag(FixedMaterial::FLAG_USE_ALPHA, true);
	line_material->set_fixed_flag(FixedMaterial::FLAG_USE_COLOR_ARRAY, true);
	line_material->set_parameter(FixedMaterial::PARAM_DIFFUSE,get_debug_collisions_color());

	collision_material=line_material;

	return collision_material;
}

Ref<Mesh> SceneTree::get_debug_contact_mesh() {

	if (debug_contact_mesh.is_valid())
		return debug_contact_mesh;

	debug_contact_mesh = Ref<Mesh>( memnew( Mesh ) );

	Ref<FixedMaterial> mat = memnew( FixedMaterial );
	mat->set_flag(Material::FLAG_UNSHADED,true);
	mat->set_flag(Material::FLAG_DOUBLE_SIDED,true);
	mat->set_fixed_flag(FixedMaterial::FLAG_USE_ALPHA,true);
	mat->set_parameter(FixedMaterial::PARAM_DIFFUSE,get_debug_collision_contact_color());

	Vector3 diamond[6]={
		Vector3(-1, 0, 0),
		Vector3( 1, 0, 0),
		Vector3( 0, -1, 0),
		Vector3( 0, 1, 0),
		Vector3( 0, 0, -1),
		Vector3( 0, 0, 1)
	};

	int diamond_faces[8*3]={
		0,2,4,
		0,3,4,
		1,2,4,
		1,3,4,
		0,2,5,
		0,3,5,
		1,2,5,
		1,3,5,
	};

	DVector<int> indices;
	for(int i=0;i<8*3;i++)
		indices.push_back(diamond_faces[i]);

	DVector<Vector3> vertices;
	for(int i=0;i<6;i++)
		vertices.push_back(diamond[i]*0.1);

	Array arr;
	arr.resize(Mesh::ARRAY_MAX);
	arr[Mesh::ARRAY_VERTEX]=vertices;
	arr[Mesh::ARRAY_INDEX]=indices;


	debug_contact_mesh->add_surface(Mesh::PRIMITIVE_TRIANGLES,arr);
	debug_contact_mesh->surface_set_material(0,mat);

	return debug_contact_mesh;

}



void SceneTree::set_pause(bool p_enabled) {

	if (p_enabled==pause)
		return;
	pause=p_enabled;
	PhysicsServer::get_singleton()->set_active(!p_enabled);
	Physics2DServer::get_singleton()->set_active(!p_enabled);
	if (get_root())
		get_root()->propagate_notification(p_enabled ? Node::NOTIFICATION_PAUSED : Node::NOTIFICATION_UNPAUSED);
}

bool SceneTree::is_paused() const {

	return pause;
}

void SceneTree::_call_input_pause(const StringName& p_group,const StringName& p_method,const InputEvent& p_input) {

	Map<StringName,Group>::Element *E=group_map.find(p_group);
	if (!E)
		return;
	Group &g=E->get();
	if (g.nodes.empty())
		return;

	_update_group_order(g);

	//copy, so copy on write happens in case something is removed from process while being called
	//performance is not lost because only if something is added/removed the vector is copied.
	Vector<Node*> nodes_copy = g.nodes;

	int node_count=nodes_copy.size();
	Node **nodes = &nodes_copy[0];

	Variant arg=p_input;
	const Variant *v[1]={&arg};

	call_lock++;

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

		if (input_handled)
			break;

		Node *n = nodes[i];
		if (call_lock && call_skip.has(n))
			continue;

		if (!n->can_process())
			continue;

		Variant::CallError ce;
		n->call_multilevel(p_method,(const Variant**)v,1);
		//ERR_FAIL_COND(node_count != g.nodes.size());
	}

	call_lock--;
	if (call_lock==0)
		call_skip.clear();
}

void SceneTree::_notify_group_pause(const StringName& p_group,int p_notification) {

	Map<StringName,Group>::Element *E=group_map.find(p_group);
	if (!E)
		return;
	Group &g=E->get();
	if (g.nodes.empty())
		return;


	_update_group_order(g);

	//copy, so copy on write happens in case something is removed from process while being called
	//performance is not lost because only if something is added/removed the vector is copied.
	Vector<Node*> nodes_copy = g.nodes;

	int node_count=nodes_copy.size();
	Node **nodes = &nodes_copy[0];

	call_lock++;

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

		Node *n = nodes[i];
		if (call_lock && call_skip.has(n))
			continue;

		if (!n->can_process())
			continue;

		n->notification(p_notification);
		//ERR_FAIL_COND(node_count != g.nodes.size());
	}

	call_lock--;
	if (call_lock==0)
		call_skip.clear();
}

/*
void SceneMainLoop::_update_listener_2d() {

	if (listener_2d.is_valid()) {

		SpatialSound2DServer::get_singleton()->listener_set_space( listener_2d, world_2d->get_sound_space() );
	}

}
*/

uint32_t SceneTree::get_last_event_id() const {

	return last_id;
}


Variant SceneTree::_call_group(const Variant** p_args, int p_argcount, Variant::CallError& r_error) {


	r_error.error=Variant::CallError::CALL_OK;

	ERR_FAIL_COND_V(p_argcount<3,Variant());
	ERR_FAIL_COND_V(!p_args[0]->is_num(),Variant());
	ERR_FAIL_COND_V(p_args[1]->get_type()!=Variant::STRING,Variant());
	ERR_FAIL_COND_V(p_args[2]->get_type()!=Variant::STRING,Variant());

	int flags = *p_args[0];
	StringName group = *p_args[1];
	StringName method = *p_args[2];
	Variant v[VARIANT_ARG_MAX];

	for(int i=0;i<MIN(p_argcount-3,5);i++) {

		v[i]=*p_args[i+3];
	}

	call_group(flags,group,method,v[0],v[1],v[2],v[3],v[4]);
	return Variant();
}


int64_t SceneTree::get_frame() const {

	return current_frame;
}


Array SceneTree::_get_nodes_in_group(const StringName& p_group) {

	Array ret;
	Map<StringName,Group>::Element *E=group_map.find(p_group);
	if (!E)
		return ret;

	_update_group_order(E->get()); //update order just in case
	int nc = E->get().nodes.size();
	if (nc==0)
		return ret;

	ret.resize(nc);

	Node **ptr = E->get().nodes.ptr();
	for(int i=0;i<nc;i++) {

		ret[i]=ptr[i];
	}

	return ret;
}

bool SceneTree::has_group(const StringName& p_identifier) const {

	return group_map.has(p_identifier);
}
void SceneTree::get_nodes_in_group(const StringName& p_group,List<Node*> *p_list) {


	Map<StringName,Group>::Element *E=group_map.find(p_group);
	if (!E)
		return;

	_update_group_order(E->get()); //update order just in case
	int nc = E->get().nodes.size();
	if (nc==0)
		return;
	Node **ptr = E->get().nodes.ptr();
	for(int i=0;i<nc;i++) {

		p_list->push_back(ptr[i]);
	}
}


static void _fill_array(Node *p_node, Array& array, int p_level) {

	array.push_back(p_level);
	array.push_back(p_node->get_name());
	array.push_back(p_node->get_type());
	array.push_back(p_node->get_instance_ID());
	for(int i=0;i<p_node->get_child_count();i++) {

		_fill_array(p_node->get_child(i),array,p_level+1);
	}
}

void SceneTree::_debugger_request_tree(void *self) {

	SceneTree *sml = (SceneTree *)self;

	Array arr;
	_fill_array(sml->root,arr,0);
	ScriptDebugger::get_singleton()->send_message("scene_tree",arr);
}


void SceneTree::_flush_delete_queue() {

	_THREAD_SAFE_METHOD_

	while( delete_queue.size() ) {

		Object *obj = ObjectDB::get_instance( delete_queue.front()->get() );
		if (obj) {
			memdelete( obj );
		}
		delete_queue.pop_front();
	}
}

void SceneTree::queue_delete(Object *p_object) {

	_THREAD_SAFE_METHOD_
	ERR_FAIL_NULL(p_object);
	p_object->_is_queued_for_deletion = true;
	delete_queue.push_back(p_object->get_instance_ID());
}


int SceneTree::get_node_count() const {

	return node_count;
}


void SceneTree::_update_root_rect() {


	if (stretch_mode==STRETCH_MODE_DISABLED) {
		root->set_rect(Rect2(Point2(),last_screen_size));
		return; //user will take care
	}

	//actual screen video mode
	Size2 video_mode = Size2(OS::get_singleton()->get_video_mode().width,OS::get_singleton()->get_video_mode().height);
	Size2 desired_res = stretch_min;

	Size2 viewport_size;
	Size2 screen_size;

	float viewport_aspect = desired_res.get_aspect();
	float video_mode_aspect = video_mode.get_aspect();

	if (stretch_aspect==STRETCH_ASPECT_IGNORE || ABS(viewport_aspect - video_mode_aspect)<CMP_EPSILON) {
		//same aspect or ignore aspect
		viewport_size=desired_res;
		screen_size=video_mode;
	} else if (viewport_aspect < video_mode_aspect) {
		// screen ratio is smaller vertically

		if (stretch_aspect==STRETCH_ASPECT_KEEP_HEIGHT) {

			//will stretch horizontally
			viewport_size.x=desired_res.y*video_mode_aspect;
			viewport_size.y=desired_res.y;
			screen_size=video_mode;

		} else {
			//will need black bars
			viewport_size=desired_res;
			screen_size.x = video_mode.y * viewport_aspect;
			screen_size.y=video_mode.y;
		}
	} else {
		//screen ratio is smaller horizontally
		if (stretch_aspect==STRETCH_ASPECT_KEEP_WIDTH) {

			//will stretch horizontally
			viewport_size.x=desired_res.x;
			viewport_size.y=desired_res.x / video_mode_aspect;
			screen_size=video_mode;

		} else {
			//will need black bars
			viewport_size=desired_res;
			screen_size.x=video_mode.x;
			screen_size.y = video_mode.x / viewport_aspect;
		}

	}

	screen_size = screen_size.floor();
	viewport_size = viewport_size.floor();

	Size2 margin;
	Size2 offset;
	//black bars and margin
	if (screen_size.x < video_mode.x) {
		margin.x = Math::round((video_mode.x - screen_size.x)/2.0);
		VisualServer::get_singleton()->black_bars_set_margins(margin.x,0,margin.x,0);
		offset.x = Math::round(margin.x * viewport_size.y / screen_size.y);
	} else if (screen_size.y < video_mode.y) {

		margin.y = Math::round((video_mode.y - screen_size.y)/2.0);
		VisualServer::get_singleton()->black_bars_set_margins(0,margin.y,0,margin.y);
		offset.y = Math::round(margin.y * viewport_size.x / screen_size.x);
	} else {
		VisualServer::get_singleton()->black_bars_set_margins(0,0,0,0);
	}

//	print_line("VP SIZE: "+viewport_size+" OFFSET: "+offset+" = "+(offset*2+viewport_size));
//	print_line("SS: "+video_mode);
	switch (stretch_mode) {
		case STRETCH_MODE_2D: {

//			root->set_rect(Rect2(Point2(),video_mode));
			root->set_as_render_target(false);
			root->set_rect(Rect2(margin,screen_size));
			root->set_size_override_stretch(true);
			root->set_size_override(true,viewport_size);

		} break;
		case STRETCH_MODE_VIEWPORT: {

			root->set_rect(Rect2(Point2(),viewport_size));
			root->set_size_override_stretch(false);
			root->set_size_override(false,Size2());
			root->set_as_render_target(true);
			root->set_render_target_update_mode(Viewport::RENDER_TARGET_UPDATE_ALWAYS);
			root->set_render_target_to_screen_rect(Rect2(margin,screen_size));

		} break;


	}

}

void SceneTree::set_screen_stretch(StretchMode p_mode,StretchAspect p_aspect,const Size2 p_minsize) {

	stretch_mode=p_mode;
	stretch_aspect=p_aspect;
	stretch_min=p_minsize;
	_update_root_rect();
}


#ifdef TOOLS_ENABLED
void SceneTree::set_edited_scene_root(Node *p_node) {
	edited_scene_root=p_node;
}

Node *SceneTree::get_edited_scene_root() const {

	return edited_scene_root;
}
#endif

void SceneTree::set_current_scene(Node* p_scene) {

	ERR_FAIL_COND(p_scene && p_scene->get_parent()!=root);
	current_scene=p_scene;
}

Node* SceneTree::get_current_scene() const{

	return current_scene;
}

void SceneTree::_change_scene(Node* p_to) {

	if (current_scene) {
		memdelete( current_scene );
		current_scene=NULL;
	}

	if (p_to) {
		current_scene=p_to;
		root->add_child(p_to);
	}
}

Error SceneTree::change_scene(const String& p_path){

	Ref<PackedScene> new_scene = ResourceLoader::load(p_path);
	if (new_scene.is_null())
		return ERR_CANT_OPEN;

	return change_scene_to(new_scene);

}
Error SceneTree::change_scene_to(const Ref<PackedScene>& p_scene){

	Node *new_scene=NULL;
	if (p_scene.is_valid()) {
		new_scene = p_scene->instance();
		ERR_FAIL_COND_V(!new_scene,ERR_CANT_CREATE);
	}

	call_deferred("_change_scene",new_scene);
	return OK;

}
Error SceneTree::reload_current_scene() {

	ERR_FAIL_COND_V(!current_scene,ERR_UNCONFIGURED);
	String fname = current_scene->get_filename();
	return change_scene(fname);
}

void SceneTree::add_current_scene(Node * p_current) {

	current_scene=p_current;
	root->add_child(p_current);
}
#ifdef DEBUG_ENABLED

void SceneTree::_live_edit_node_path_func(const NodePath &p_path,int p_id) {

	live_edit_node_path_cache[p_id]=p_path;
}

void SceneTree::_live_edit_res_path_func(const String &p_path,int p_id) {

	live_edit_resource_cache[p_id]=p_path;
}

void SceneTree::_live_edit_node_set_func(int p_id,const StringName& p_prop,const Variant& p_value) {

	if (!live_edit_node_path_cache.has(p_id))
		return;

	NodePath np = live_edit_node_path_cache[p_id];
	Node *base = NULL;
	if (root->has_node(live_edit_root))
		base = root->get_node(live_edit_root);

	Map<String,Set<Node*> >::Element *E=live_scene_edit_cache.find(live_edit_scene);
	if (!E)
		return; //scene not editable

	for(Set<Node*>::Element *F=E->get().front();F;F=F->next()) {

		Node *n=F->get();

		if (base && !base->is_a_parent_of(n))
			continue;

		if (!n->has_node(np))
			continue;
		Node *n2 = n->get_node(np);

		n2->set(p_prop,p_value);
	}

}

void SceneTree::_live_edit_node_set_res_func(int p_id,const StringName& p_prop,const String& p_value) {

	RES r = ResourceLoader::load(p_value);
	if (!r.is_valid())
		return;
	_live_edit_node_set_func(p_id,p_prop,r);

}
void SceneTree::_live_edit_node_call_func(int p_id,const StringName& p_method,VARIANT_ARG_DECLARE) {

	if (!live_edit_node_path_cache.has(p_id))
		return;

	NodePath np = live_edit_node_path_cache[p_id];
	Node *base = NULL;
	if (root->has_node(live_edit_root))
		base = root->get_node(live_edit_root);

	Map<String,Set<Node*> >::Element *E=live_scene_edit_cache.find(live_edit_scene);
	if (!E)
		return; //scene not editable

	for(Set<Node*>::Element *F=E->get().front();F;F=F->next()) {

		Node *n=F->get();

		if (base && !base->is_a_parent_of(n))
			continue;

		if (!n->has_node(np))
			continue;
		Node *n2 = n->get_node(np);

		n2->call(p_method,VARIANT_ARG_PASS);
	}
}
void SceneTree::_live_edit_res_set_func(int p_id,const StringName& p_prop,const Variant& p_value) {

	if (!live_edit_resource_cache.has(p_id))
		return;

	String resp = live_edit_resource_cache[p_id];

	if (!ResourceCache::has(resp))
		return;

	RES r = ResourceCache::get(resp);
	if (!r.is_valid())
		return;

	r->set(p_prop,p_value);
}
void SceneTree::_live_edit_res_set_res_func(int p_id,const StringName& p_prop,const String& p_value) {

	RES r = ResourceLoader::load(p_value);
	if (!r.is_valid())
		return;
	_live_edit_res_set_func(p_id,p_prop,r);

}
void SceneTree::_live_edit_res_call_func(int p_id,const StringName& p_method,VARIANT_ARG_DECLARE) {

	if (!live_edit_resource_cache.has(p_id))
		return;

	String resp = live_edit_resource_cache[p_id];

	if (!ResourceCache::has(resp))
		return;

	RES r = ResourceCache::get(resp);
	if (!r.is_valid())
		return;

	r->call(p_method,VARIANT_ARG_PASS);
}

void SceneTree::_live_edit_root_func(const NodePath& p_scene_path,const String& p_scene_from) {

	live_edit_root=p_scene_path;
	live_edit_scene=p_scene_from;
}

void SceneTree::_live_edit_create_node_func(const NodePath& p_parent,const String& p_type,const String& p_name) {


	Node *base = NULL;
	if (root->has_node(live_edit_root))
		base = root->get_node(live_edit_root);

	Map<String,Set<Node*> >::Element *E=live_scene_edit_cache.find(live_edit_scene);
	if (!E)
		return; //scene not editable

	for(Set<Node*>::Element *F=E->get().front();F;F=F->next()) {

		Node *n=F->get();

		if (base && !base->is_a_parent_of(n))
			continue;

		if (!n->has_node(p_parent))
			continue;
		Node *n2 = n->get_node(p_parent);

		Object *o = ObjectTypeDB::instance(p_type);
		if (!o)
			continue;
		Node *no=o->cast_to<Node>();
		no->set_name(p_name);

		n2->add_child(no);
	}
}
void SceneTree::_live_edit_instance_node_func(const NodePath& p_parent,const String& p_path,const String& p_name){

	Ref<PackedScene> ps = ResourceLoader::load(p_path);

	if (!ps.is_valid())
		return;

	Node *base = NULL;
	if (root->has_node(live_edit_root))
		base = root->get_node(live_edit_root);

	Map<String,Set<Node*> >::Element *E=live_scene_edit_cache.find(live_edit_scene);
	if (!E)
		return; //scene not editable

	for(Set<Node*>::Element *F=E->get().front();F;F=F->next()) {

		Node *n=F->get();

		if (base && !base->is_a_parent_of(n))
			continue;

		if (!n->has_node(p_parent))
			continue;
		Node *n2 = n->get_node(p_parent);



		Node *no=ps->instance();
		no->set_name(p_name);

		n2->add_child(no);
	}
}
void SceneTree::_live_edit_remove_node_func(const NodePath& p_at){

	Node *base = NULL;
	if (root->has_node(live_edit_root))
		base = root->get_node(live_edit_root);

	Map<String,Set<Node*> >::Element *E=live_scene_edit_cache.find(live_edit_scene);
	if (!E)
		return; //scene not editable

	for(Set<Node*>::Element *F=E->get().front();F;) {

		Set<Node*>::Element *N=F->next();

		Node *n=F->get();

		if (base && !base->is_a_parent_of(n))
			continue;

		if (!n->has_node(p_at))
			continue;
		Node *n2 = n->get_node(p_at);

		memdelete(n2);

		F=N;

	}
}
void SceneTree::_live_edit_remove_and_keep_node_func(const NodePath& p_at,ObjectID p_keep_id){

	Node *base = NULL;
	if (root->has_node(live_edit_root))
		base = root->get_node(live_edit_root);

	Map<String,Set<Node*> >::Element *E=live_scene_edit_cache.find(live_edit_scene);
	if (!E)
		return; //scene not editable


	for(Set<Node*>::Element *F=E->get().front();F;) {

		Set<Node*>::Element *N=F->next();

		Node *n=F->get();

		if (base && !base->is_a_parent_of(n))
			continue;

		if (!n->has_node(p_at))
			continue;

		Node *n2 = n->get_node(p_at);

		n2->get_parent()->remove_child(n2);

		live_edit_remove_list[n][p_keep_id]=n2;

		F=N;

	}
}
void SceneTree::_live_edit_restore_node_func(ObjectID p_id,const NodePath& p_at,int p_at_pos){


	Node *base = NULL;
	if (root->has_node(live_edit_root))
		base = root->get_node(live_edit_root);

	Map<String,Set<Node*> >::Element *E=live_scene_edit_cache.find(live_edit_scene);
	if (!E)
		return; //scene not editable

	for(Set<Node*>::Element *F=E->get().front();F;) {

		Set<Node*>::Element *N=F->next();

		Node *n=F->get();

		if (base && !base->is_a_parent_of(n))
			continue;

		if (!n->has_node(p_at))
			continue;
		Node *n2 = n->get_node(p_at);

		Map<Node*,Map<ObjectID,Node*> >::Element *EN=live_edit_remove_list.find(n);

		if (!EN)
			continue;

		Map<ObjectID,Node*>::Element *FN=EN->get().find(p_id);

		if (!FN)
			continue;
		n2->add_child(FN->get());

		EN->get().erase(FN);

		if (EN->get().size()==0) {
			live_edit_remove_list.erase(EN);
		}

		F=N;

	}
}
void SceneTree::_live_edit_duplicate_node_func(const NodePath& p_at,const String& p_new_name){

	Node *base = NULL;
	if (root->has_node(live_edit_root))
		base = root->get_node(live_edit_root);

	Map<String,Set<Node*> >::Element *E=live_scene_edit_cache.find(live_edit_scene);
	if (!E)
		return; //scene not editable

	for(Set<Node*>::Element *F=E->get().front();F;F=F->next()) {

		Node *n=F->get();

		if (base && !base->is_a_parent_of(n))
			continue;

		if (!n->has_node(p_at))
			continue;
		Node *n2 = n->get_node(p_at);

		Node *dup = n2->duplicate(true);

		if (!dup)
			continue;

		dup->set_name(p_new_name);
		n2->get_parent()->add_child(dup);

	}
}
void SceneTree::_live_edit_reparent_node_func(const NodePath& p_at,const NodePath& p_new_place,const String& p_new_name,int p_at_pos){

	Node *base = NULL;
	if (root->has_node(live_edit_root))
		base = root->get_node(live_edit_root);

	Map<String,Set<Node*> >::Element *E=live_scene_edit_cache.find(live_edit_scene);
	if (!E)
		return; //scene not editable

	for(Set<Node*>::Element *F=E->get().front();F;F=F->next()) {

		Node *n=F->get();

		if (base && !base->is_a_parent_of(n))
			continue;

		if (!n->has_node(p_at))
			continue;
		Node *nfrom = n->get_node(p_at);

		if (!n->has_node(p_new_place))
			continue;
		Node *nto = n->get_node(p_new_place);

		nfrom->get_parent()->remove_child(nfrom);
		nfrom->set_name(p_new_name);

		nto->add_child(nfrom);
		if (p_at_pos>=0)
			nto->move_child(nfrom,p_at_pos);

	}
}


#endif


void SceneTree::drop_files(const Vector<String>& p_files,int p_from_screen) {

	emit_signal("files_dropped",p_files,p_from_screen);
	MainLoop::drop_files(p_files,p_from_screen);
}


Ref<SceneTreeTimer> SceneTree::create_timer(float p_delay_sec) {

	Ref<SceneTreeTimer> stt;
	stt.instance();
	stt->set_time_left(p_delay_sec);
	timers.push_back(stt);
	return stt;
}

void SceneTree::_network_peer_connected(int p_id) {


	connected_peers.insert(p_id);
	path_get_cache.insert(p_id,PathGetCache());


	emit_signal("network_peer_connected",p_id);
}

void SceneTree::_network_peer_disconnected(int p_id) {

	connected_peers.erase(p_id);
	path_get_cache.erase(p_id); //I no longer need your cache, sorry
	emit_signal("network_peer_disconnected",p_id);
}

void SceneTree::_connected_to_server() {

	emit_signal("connected_to_server");
}

void SceneTree::_connection_failed() {

	emit_signal("connection_failed");
}

void SceneTree::_server_disconnected() {

	emit_signal("server_disconnected");
}

void SceneTree::set_network_peer(const Ref<NetworkedMultiplayerPeer>& p_network_peer) {
	if (network_peer.is_valid()) {
		network_peer->disconnect("peer_connected",this,"_network_peer_connected");
		network_peer->disconnect("peer_disconnected",this,"_network_peer_disconnected");
		network_peer->disconnect("connection_succeeded",this,"_connected_to_server");
		network_peer->disconnect("connection_failed",this,"_connection_failed");
		network_peer->disconnect("server_disconnected",this,"_server_disconnected");
		connected_peers.clear();
		path_get_cache.clear();
		path_send_cache.clear();
		last_send_cache_id=1;
	}

	ERR_EXPLAIN("Supplied NetworkedNetworkPeer must be connecting or connected.");
	ERR_FAIL_COND(p_network_peer.is_valid() && p_network_peer->get_connection_status()==NetworkedMultiplayerPeer::CONNECTION_DISCONNECTED);

	network_peer=p_network_peer;

	if (network_peer.is_valid()) {
		network_peer->connect("peer_connected",this,"_network_peer_connected");
		network_peer->connect("peer_disconnected",this,"_network_peer_disconnected");
		network_peer->connect("connection_succeeded",this,"_connected_to_server");
		network_peer->connect("connection_failed",this,"_connection_failed");
		network_peer->connect("server_disconnected",this,"_server_disconnected");
	}
}

bool SceneTree::is_network_server() const {

	ERR_FAIL_COND_V(!network_peer.is_valid(),false);
	return network_peer->is_server();

}

int SceneTree::get_network_unique_id() const {

	ERR_FAIL_COND_V(!network_peer.is_valid(),0);
	return network_peer->get_unique_id();
}

void SceneTree::set_refuse_new_network_connections(bool p_refuse) {
	ERR_FAIL_COND(!network_peer.is_valid());
	network_peer->set_refuse_new_connections(p_refuse);
}

bool SceneTree::is_refusing_new_network_connections() const {

	ERR_FAIL_COND_V(!network_peer.is_valid(),false);

	return network_peer->is_refusing_new_connections();

}


void SceneTree::_rpc(Node* p_from,int p_to,bool p_unreliable,bool p_set,const StringName& p_name,const Variant** p_arg,int p_argcount) {

	if (network_peer.is_null()) {
		ERR_EXPLAIN("Attempt to remote call/set when networking is not active in SceneTree.");
		ERR_FAIL();
	}

	if (network_peer->get_connection_status()==NetworkedMultiplayerPeer::CONNECTION_CONNECTING) {
		ERR_EXPLAIN("Attempt to remote call/set when networking is not connected yet in SceneTree.");
		ERR_FAIL();
	}

	if (network_peer->get_connection_status()==NetworkedMultiplayerPeer::CONNECTION_DISCONNECTED) {
		ERR_EXPLAIN("Attempt to remote call/set when networking is disconnected.");
		ERR_FAIL();
	}

	if (p_to!=0 && !connected_peers.has(ABS(p_to))) {
		if (p_to==get_network_unique_id()) {
			ERR_EXPLAIN("Attempt to remote call/set yourself! unique ID: "+itos(get_network_unique_id()));
		} else {
			ERR_EXPLAIN("Attempt to remote call unexisting ID: "+itos(p_to));

		}

		ERR_FAIL();
	}

	NodePath from_path = p_from->get_path();
	ERR_FAIL_COND(from_path.is_empty());

	//create base packet
	Array message;

	message.resize(3+p_argcount); //alloc size for args

	//set message type
	if (p_set) {
		message[0]=NETWORK_COMMAND_REMOTE_SET;
	} else {
		message[0]=NETWORK_COMMAND_REMOTE_CALL;
	}

	//set message name
	message[2]=p_name;

	//set message args
	for(int i=0;i<p_argcount;i++) {
		message[3+i]=*p_arg[i];
	}

	//see if the path is cached
	PathSentCache *psc = path_send_cache.getptr(from_path);
	if (!psc) {
		//path is not cached, create
		path_send_cache[from_path]=PathSentCache();
		psc = path_send_cache.getptr(from_path);
		psc->id=last_send_cache_id++;

	}

	//see if all peers have cached path (is so, call can be fast)
	bool has_all_peers=true;

	List<int> peers_to_add; //if one is missing, take note to add it

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

		if (p_to<0 && E->get()==-p_to)
			continue; //continue, excluded

		if (p_to>0 && E->get()!=p_to)
			continue; //continue, not for this peer

		Map<int,bool>::Element *F = psc->confirmed_peers.find(E->get());

		if (!F || F->get()==false) {
			//path was not cached, or was cached but is unconfirmed
			if (!F) {
				//not cached at all, take note
				peers_to_add.push_back(E->get());
			}

			has_all_peers=false;
		}
	}

	//those that need to be added, send a message for this

	for (List<int>::Element *E=peers_to_add.front();E;E=E->next()) {

		Array add_path_message;
		add_path_message.resize(3);
		add_path_message[0]=NETWORK_COMMAND_SIMPLIFY_PATH;
		add_path_message[1]=from_path;
		add_path_message[2]=psc->id;

		network_peer->set_target_peer(E->get()); //to all of you
		network_peer->set_transfer_mode(NetworkedMultiplayerPeer::TRANSFER_MODE_RELIABLE);
		network_peer->put_var(add_path_message); //a message with love

		psc->confirmed_peers.insert(E->get(),false); //insert into confirmed, but as false since it was not confirmed
	}

	//take chance and set transfer mode, since all send methods will use it
	network_peer->set_transfer_mode(p_unreliable ? NetworkedMultiplayerPeer::TRANSFER_MODE_UNRELIABLE : NetworkedMultiplayerPeer::TRANSFER_MODE_RELIABLE);

	if (has_all_peers) {

		//they all have verified paths, so send fast
		message[1]=psc->id;

		network_peer->set_target_peer(p_to); //to all of you
		network_peer->put_var(message); //a message with love
	} else {
		//not all verified path, so send one by one
		for (Set<int>::Element *E=connected_peers.front();E;E=E->next()) {

			if (p_to<0 && E->get()==-p_to)
				continue; //continue, excluded

			if (p_to>0 && E->get()!=p_to)
				continue; //continue, not for this peer

			Map<int,bool>::Element *F = psc->confirmed_peers.find(E->get());
			ERR_CONTINUE(!F);//should never happen

			network_peer->set_target_peer(E->get()); //to this one specifically

			if (F->get()==true) {
				//this one confirmed path, so use id
				message[1]=psc->id;
			} else {
				//this one did not confirm path yet, so use entire path (sorry!)
				message[1]=from_path;
			}

			network_peer->put_var(message);
		}
	}
}


void SceneTree::_network_process_packet(int p_from, const Array& p_packet) {

	ERR_FAIL_COND(p_packet.empty());

	int packet_type = p_packet[0];

	switch(packet_type) {

		case NETWORK_COMMAND_REMOTE_CALL:
		case NETWORK_COMMAND_REMOTE_SET: {

			ERR_FAIL_COND(p_packet.size()<3);
			Variant target = p_packet[1];
			Node* node=NULL;

			if (target.get_type()==Variant::NODE_PATH) {
				NodePath np = target;
				node = get_root()->get_node(np);
				if (node==NULL) {
					ERR_EXPLAIN("Failed to get path from RPC: "+String(np));
					ERR_FAIL_COND(node==NULL);
				}
			} else if (target.get_type()==Variant::INT) {

				int id = target;

				Map<int,PathGetCache>::Element *E=path_get_cache.find(p_from);
				ERR_FAIL_COND(!E);

				Map<int,PathGetCache::NodeInfo>::Element *F=E->get().nodes.find(id);
				ERR_FAIL_COND(!F);

				PathGetCache::NodeInfo *ni = &F->get();
				//do proper caching later

				node = get_root()->get_node(ni->path);
				if (node==NULL) {
					ERR_EXPLAIN("Failed to get cached path from RPC: "+String(ni->path));
					ERR_FAIL_COND(node==NULL);
				}


			} else {
				ERR_FAIL();
			}

			StringName name = p_packet[2];

			if (packet_type==NETWORK_COMMAND_REMOTE_CALL) {

				if (!node->can_call_rpc(name))
					return;

				int argc = p_packet.size()-3;
				Vector<Variant> args;
				Vector<const Variant*> argp;
				args.resize(argc);
				argp.resize(argc);

				for(int i=0;i<argc;i++) {
					args[i]=p_packet[3+i];
					argp[i]=&args[i];
				}

				Variant::CallError ce;

				node->call(name,argp.ptr(),argc,ce);
				if (ce.error!=Variant::CallError::CALL_OK) {
					String error = Variant::get_call_error_text(node,name,argp.ptr(),argc,ce);
					error="RPC - "+error;
					ERR_PRINTS(error);
				}

			} else {

				if (!node->can_call_rset(name))
					return;


				ERR_FAIL_COND(p_packet.size()!=4);
				Variant value = p_packet[3];
				bool valid;

				node->set(name,value,&valid);
				if (!valid) {
					String error = "Error setting remote property '"+String(name)+"', not found in object of type "+node->get_type();
					ERR_PRINTS(error);
				}
			}

		} break;
		case NETWORK_COMMAND_SIMPLIFY_PATH: {

			ERR_FAIL_COND(p_packet.size()!=3);
			NodePath path = p_packet[1];
			int id = p_packet[2];

			if (!path_get_cache.has(p_from)) {
				path_get_cache[p_from]=PathGetCache();
			}

			PathGetCache::NodeInfo ni;
			ni.path=path;
			ni.instance=0;

			path_get_cache[p_from].nodes[id]=ni;

			network_peer->set_transfer_mode(NetworkedMultiplayerPeer::TRANSFER_MODE_RELIABLE);
			network_peer->set_target_peer(p_from);

			Array message;
			message.resize(2);
			message[0]=NETWORK_COMMAND_CONFIRM_PATH;
			message[1]=path;
			network_peer->put_var(message);
		} break;
		case NETWORK_COMMAND_CONFIRM_PATH: {

			ERR_FAIL_COND(p_packet.size()!=2);
			NodePath path = p_packet[1];

			PathSentCache *psc = path_send_cache.getptr(path);
			ERR_FAIL_COND(!psc);

			Map<int,bool>::Element *E=psc->confirmed_peers.find(p_from);
			ERR_FAIL_COND(!E);
			E->get()=true;
		} break;
	}

}

void SceneTree::_network_poll() {

	if (!network_peer.is_valid() || network_peer->get_connection_status()==NetworkedMultiplayerPeer::CONNECTION_DISCONNECTED)
		return;

	network_peer->poll();

	if (!network_peer.is_valid()) //it's possible that polling might have resulted in a disconnection, so check here
		return;

	while(network_peer->get_available_packet_count()) {

		int sender = network_peer->get_packet_peer();
		Variant packet;
		Error err = network_peer->get_var(packet);
		if (err!=OK) {
			ERR_PRINT("Error getting packet!");
		}
		if (packet.get_type()!=Variant::ARRAY) {

			ERR_PRINT("Error getting packet! (not an array)");
		}

		_network_process_packet(sender,packet);

		if (!network_peer.is_valid()) {
			break; //it's also possible that a packet or RPC caused a disconnection, so also check here
		}
	}


}


void SceneTree::_bind_methods() {


	//ObjectTypeDB::bind_method(_MD("call_group","call_flags","group","method","arg1","arg2"),&SceneMainLoop::_call_group,DEFVAL(Variant()),DEFVAL(Variant()));
	ObjectTypeDB::bind_method(_MD("notify_group","call_flags","group","notification"),&SceneTree::notify_group);
	ObjectTypeDB::bind_method(_MD("set_group","call_flags","group","property","value"),&SceneTree::set_group);

	ObjectTypeDB::bind_method(_MD("get_nodes_in_group","group"),&SceneTree::_get_nodes_in_group);

	ObjectTypeDB::bind_method(_MD("get_root:Viewport"),&SceneTree::get_root);
	ObjectTypeDB::bind_method(_MD("has_group","name"),&SceneTree::has_group);

	ObjectTypeDB::bind_method(_MD("set_auto_accept_quit","enabled"),&SceneTree::set_auto_accept_quit);

	ObjectTypeDB::bind_method(_MD("set_editor_hint","enable"),&SceneTree::set_editor_hint);
	ObjectTypeDB::bind_method(_MD("is_editor_hint"),&SceneTree::is_editor_hint);
	ObjectTypeDB::bind_method(_MD("set_debug_collisions_hint","enable"),&SceneTree::set_debug_collisions_hint);
	ObjectTypeDB::bind_method(_MD("is_debugging_collisions_hint"),&SceneTree::is_debugging_collisions_hint);
	ObjectTypeDB::bind_method(_MD("set_debug_navigation_hint","enable"),&SceneTree::set_debug_navigation_hint);
	ObjectTypeDB::bind_method(_MD("is_debugging_navigation_hint"),&SceneTree::is_debugging_navigation_hint);

#ifdef TOOLS_ENABLED
	ObjectTypeDB::bind_method(_MD("set_edited_scene_root","scene"),&SceneTree::set_edited_scene_root);
	ObjectTypeDB::bind_method(_MD("get_edited_scene_root"),&SceneTree::get_edited_scene_root);
#endif

	ObjectTypeDB::bind_method(_MD("set_pause","enable"),&SceneTree::set_pause);
	ObjectTypeDB::bind_method(_MD("is_paused"),&SceneTree::is_paused);
	ObjectTypeDB::bind_method(_MD("set_input_as_handled"),&SceneTree::set_input_as_handled);

	ObjectTypeDB::bind_method(_MD("create_timer:SceneTreeTimer","time_sec"),&SceneTree::create_timer);


	ObjectTypeDB::bind_method(_MD("get_node_count"),&SceneTree::get_node_count);
	ObjectTypeDB::bind_method(_MD("get_frame"),&SceneTree::get_frame);
	ObjectTypeDB::bind_method(_MD("quit"),&SceneTree::quit);

	ObjectTypeDB::bind_method(_MD("set_screen_stretch","mode","aspect","minsize"),&SceneTree::set_screen_stretch);

	ObjectTypeDB::bind_method(_MD("queue_delete","obj"),&SceneTree::queue_delete);




	MethodInfo mi;
	mi.name="call_group";
	mi.arguments.push_back( PropertyInfo( Variant::INT, "flags"));
	mi.arguments.push_back( PropertyInfo( Variant::STRING, "group"));
	mi.arguments.push_back( PropertyInfo( Variant::STRING, "method"));
	Vector<Variant> defargs;
	for(int i=0;i<VARIANT_ARG_MAX;i++) {
		mi.arguments.push_back( PropertyInfo( Variant::NIL, "arg"+itos(i)));
		defargs.push_back(Variant());
	}

	ObjectTypeDB::bind_native_method(METHOD_FLAGS_DEFAULT,"call_group",&SceneTree::_call_group,mi,defargs);

	ObjectTypeDB::bind_method(_MD("set_current_scene","child_node:Node"),&SceneTree::set_current_scene);
	ObjectTypeDB::bind_method(_MD("get_current_scene:Node"),&SceneTree::get_current_scene);

	ObjectTypeDB::bind_method(_MD("change_scene","path"),&SceneTree::change_scene);
	ObjectTypeDB::bind_method(_MD("change_scene_to","packed_scene:PackedScene"),&SceneTree::change_scene_to);

	ObjectTypeDB::bind_method(_MD("reload_current_scene"),&SceneTree::reload_current_scene);

	ObjectTypeDB::bind_method(_MD("_change_scene"),&SceneTree::_change_scene);


	ObjectTypeDB::bind_method(_MD("set_network_peer","peer:NetworkedMultiplayerPeer"),&SceneTree::set_network_peer);
	ObjectTypeDB::bind_method(_MD("is_network_server"),&SceneTree::is_network_server);
	ObjectTypeDB::bind_method(_MD("get_network_unique_id"),&SceneTree::get_network_unique_id);
	ObjectTypeDB::bind_method(_MD("set_refuse_new_network_connections","refuse"),&SceneTree::set_refuse_new_network_connections);
	ObjectTypeDB::bind_method(_MD("is_refusing_new_network_connections"),&SceneTree::is_refusing_new_network_connections);
	ObjectTypeDB::bind_method(_MD("_network_peer_connected"),&SceneTree::_network_peer_connected);
	ObjectTypeDB::bind_method(_MD("_network_peer_disconnected"),&SceneTree::_network_peer_disconnected);
	ObjectTypeDB::bind_method(_MD("_connected_to_server"),&SceneTree::_connected_to_server);
	ObjectTypeDB::bind_method(_MD("_connection_failed"),&SceneTree::_connection_failed);
	ObjectTypeDB::bind_method(_MD("_server_disconnected"),&SceneTree::_server_disconnected);

	ADD_SIGNAL( MethodInfo("tree_changed") );
	ADD_SIGNAL( MethodInfo("node_removed",PropertyInfo( Variant::OBJECT, "node") ) );
	ADD_SIGNAL( MethodInfo("screen_resized") );
	ADD_SIGNAL( MethodInfo("node_configuration_warning_changed",PropertyInfo( Variant::OBJECT, "node")) );

	ADD_SIGNAL( MethodInfo("idle_frame"));
	ADD_SIGNAL( MethodInfo("fixed_frame"));

	ADD_SIGNAL( MethodInfo("files_dropped",PropertyInfo(Variant::STRING_ARRAY,"files"),PropertyInfo(Variant::INT,"screen")) );
	ADD_SIGNAL( MethodInfo("network_peer_connected",PropertyInfo(Variant::INT,"id")));
	ADD_SIGNAL( MethodInfo("network_peer_disconnected",PropertyInfo(Variant::INT,"id")));
	ADD_SIGNAL( MethodInfo("connected_to_server"));
	ADD_SIGNAL( MethodInfo("connection_failed"));
	ADD_SIGNAL( MethodInfo("server_disconnected"));

	BIND_CONSTANT( GROUP_CALL_DEFAULT );
	BIND_CONSTANT( GROUP_CALL_REVERSE );
	BIND_CONSTANT( GROUP_CALL_REALTIME );
	BIND_CONSTANT( GROUP_CALL_UNIQUE );

	BIND_CONSTANT( STRETCH_MODE_DISABLED );
	BIND_CONSTANT( STRETCH_MODE_2D );
	BIND_CONSTANT( STRETCH_MODE_VIEWPORT );
	BIND_CONSTANT( STRETCH_ASPECT_IGNORE );
	BIND_CONSTANT( STRETCH_ASPECT_KEEP );
	BIND_CONSTANT( STRETCH_ASPECT_KEEP_WIDTH );
	BIND_CONSTANT( STRETCH_ASPECT_KEEP_HEIGHT );

}

SceneTree *SceneTree::singleton=NULL;

SceneTree::SceneTree() {

	singleton=this;
	_quit=false;
	initialized=false;
	editor_hint=false;
	debug_collisions_hint=false;
	debug_navigation_hint=false;
	debug_collisions_color=GLOBAL_DEF("debug/collision_shape_color",Color(0.0,0.6,0.7,0.5));
	debug_collision_contact_color=GLOBAL_DEF("debug/collision_contact_color",Color(1.0,0.2,0.1,0.8));
	debug_navigation_color=GLOBAL_DEF("debug/navigation_geometry_color",Color(0.1,1.0,0.7,0.4));
	debug_navigation_disabled_color=GLOBAL_DEF("debug/navigation_disabled_geometry_color",Color(1.0,0.7,0.1,0.4));
	collision_debug_contacts=GLOBAL_DEF("debug/collision_max_contacts_displayed",10000);


	tree_version=1;
	fixed_process_time=1;
	idle_process_time=1;
	last_id=1;
	root=NULL;
	current_frame=0;
	tree_changed_name="tree_changed";
	node_removed_name="node_removed";
	ugc_locked=false;
	call_lock=0;
	root_lock=0;
	node_count=0;

	//create with mainloop

	root = memnew( Viewport );
	root->set_name("root");
	root->set_world( Ref<World>( memnew( World )));
	//root->set_world_2d( Ref<World2D>( memnew( World2D )));
	root->set_as_audio_listener(true);
	root->set_as_audio_listener_2d(true);
	current_scene=NULL;

	stretch_mode=STRETCH_MODE_DISABLED;
	stretch_aspect=STRETCH_ASPECT_IGNORE;

	last_screen_size=Size2( OS::get_singleton()->get_video_mode().width, OS::get_singleton()->get_video_mode().height );
	root->set_rect(Rect2(Point2(),last_screen_size));

	if (ScriptDebugger::get_singleton()) {
		ScriptDebugger::get_singleton()->set_request_scene_tree_message_func(_debugger_request_tree,this);
	}

	root->set_physics_object_picking(GLOBAL_DEF("physics/enable_object_picking",true));

#ifdef TOOLS_ENABLED
	edited_scene_root=NULL;
#endif

#ifdef DEBUG_ENABLED


	live_edit_funcs.udata=this;
	live_edit_funcs.node_path_func=_live_edit_node_path_funcs;
	live_edit_funcs.res_path_func=_live_edit_res_path_funcs;
	live_edit_funcs.node_set_func=_live_edit_node_set_funcs;
	live_edit_funcs.node_set_res_func=_live_edit_node_set_res_funcs;
	live_edit_funcs.node_call_func=_live_edit_node_call_funcs;
	live_edit_funcs.res_set_func=_live_edit_res_set_funcs;
	live_edit_funcs.res_set_res_func=_live_edit_res_set_res_funcs;
	live_edit_funcs.res_call_func=_live_edit_res_call_funcs;
	live_edit_funcs.root_func=_live_edit_root_funcs;

	live_edit_funcs.tree_create_node_func=_live_edit_create_node_funcs;
	live_edit_funcs.tree_instance_node_func=_live_edit_instance_node_funcs;
	live_edit_funcs.tree_remove_node_func=_live_edit_remove_node_funcs;
	live_edit_funcs.tree_remove_and_keep_node_func=_live_edit_remove_and_keep_node_funcs;
	live_edit_funcs.tree_restore_node_func=_live_edit_restore_node_funcs;
	live_edit_funcs.tree_duplicate_node_func=_live_edit_duplicate_node_funcs;
	live_edit_funcs.tree_reparent_node_func=_live_edit_reparent_node_funcs;

	if (ScriptDebugger::get_singleton()) {
		ScriptDebugger::get_singleton()->set_live_edit_funcs(&live_edit_funcs);
	}

	live_edit_root=NodePath("/root");

	last_send_cache_id=1;

#endif


}


SceneTree::~SceneTree() {


}