text: /*************************************************************************/
  /*  particles_editor_plugin.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 "particles_editor_plugin.h"
  #include "io/resource_loader.h"
  #include "servers/visual/particle_system_sw.h"
  #include "tools/editor/plugins/spatial_editor_plugin.h"
  
  
  void ParticlesEditor::_node_removed(Node *p_node) {
  
  	if(p_node==node) {
  		node=NULL;
  		hide();
  	}
  
  }
  
  
  void ParticlesEditor::_resource_seleted(const String& p_res) {
  
  	//print_line("selected resource path: "+p_res);
  }
  
  void ParticlesEditor::_node_selected(const NodePath& p_path){
  
  
  	Node *sel = get_node(p_path);
  	if (!sel)
  		return;
  
  	VisualInstance *vi = sel->cast_to<VisualInstance>();
  	if (!vi) {
  
  		err_dialog->set_text("Node does not contain geometry.");
  		err_dialog->popup_centered_minsize();
  		return;
  	}
  
  	geometry = vi->get_faces(VisualInstance::FACES_SOLID);
  
  	if (geometry.size()==0) {
  
  		err_dialog->set_text("Node does not contain geometry (faces).");
  		err_dialog->popup_centered_minsize();
  		return;
  
  	}
  
  	Transform geom_xform = node->get_global_transform().affine_inverse() * vi->get_global_transform();
  
  	int gc = geometry.size();
  	DVector<Face3>::Write w = geometry.write();
  
  
  	for(int i=0;i<gc;i++) {
  		for(int j=0;j<3;j++) {
  			w[i].vertex[j] = geom_xform.xform( w[i].vertex[j] );
  		}
  	}
  
  
  	w = DVector<Face3>::Write();
  
  	emission_dialog->popup_centered(Size2(300,130));
  }
  
  
  /*
  
  void ParticlesEditor::_populate() {
  
  	if(!node)
  		return;
  
  
  	if (node->get_particles().is_null())
  		return;
  
  	node->get_particles()->set_instance_count(populate_amount->get_text().to_int());
  	node->populate_parent(populate_rotate_random->get_val(),populate_tilt_random->get_val(),populate_scale_random->get_text().to_double(),populate_scale->get_text().to_double());
  
  }
  */
  
  void ParticlesEditor::_notification(int p_notification) {
  
  	if (p_notification==NOTIFICATION_ENTER_TREE) {
  		options->set_icon(options->get_popup()->get_icon("Particles","EditorIcons"));
  
  	}
  }
  
  
  void ParticlesEditor::_menu_option(int p_option) {
  
  
  	switch(p_option) {
  
  		case MENU_OPTION_GENERATE_AABB: {
  
  			Transform globalizer = node->get_global_transform();
  			ParticleSystemSW pssw;
  			for(int i=0;i<VS::PARTICLE_VAR_MAX;i++) {
  
  				pssw.particle_vars[i]=node->get_variable((Particles::Variable)i);
  				pssw.particle_randomness[i]=node->get_randomness((Particles::Variable)i);
  			}
  
  			pssw.emission_half_extents=node->get_emission_half_extents();
  			pssw.emission_points=node->get_emission_points();
  			pssw.emission_base_velocity=node->get_emission_base_velocity();
  			pssw.amount=node->get_amount();
  			pssw.gravity_normal=node->get_gravity_normal();
  			pssw.emitting=true;
  			pssw.height_from_velocity=node->has_height_from_velocity();
  			pssw.color_phase_count=1;
  
  
  			ParticleSystemProcessSW pp;
  			float delta=0.01;
  			float lifetime=pssw.particle_vars[VS::PARTICLE_LIFETIME];
  
  
  			Transform localizer = globalizer.affine_inverse();
  			AABB aabb;
  			for(float t=0;t<lifetime;t+=delta) {
  
  				pp.process(&pssw,globalizer,delta);
  				for(int i=0;i<pp.particle_data.size();i++) {
  
  					Vector3 p = localizer.xform(pp.particle_data[i].pos);
  
  					if (t==0 && i==0)
  						aabb.pos=p;
  					else
  						aabb.expand_to(p);
  				}
  			}
  
  			aabb.grow_by( aabb.get_longest_axis_size()*0.2);
  
  			node->set_visibility_aabb(aabb);
  
  
  		} break;
  		case MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_MESH: {
  
  
  			emission_file_dialog->popup_centered_ratio();
  
  		} break;
  
  		case MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_NODE: {
  /*
  			Node *root = get_scene()->get_root_node();
  			ERR_FAIL_COND(!root);
  			EditorNode *en = root->cast_to<EditorNode>();
  			ERR_FAIL_COND(!en);
  			Node * node = en->get_edited_scene();
  */
  			emission_tree_dialog->popup_centered_ratio();
  
  		} break;
  	}
  }
  
  
  void ParticlesEditor::edit(Particles *p_particles) {
  
  	node=p_particles;
  
  }
  
  void ParticlesEditor::_generate_emission_points() {
  
  	/// hacer codigo aca
  	DVector<Vector3> points;
  
  	if (emission_fill->get_selected()==0) {
  
  		float area_accum=0;
  		Map<float,int> triangle_area_map;
  		print_line("geometry size: "+itos(geometry.size()));
  
  		for(int i=0;i<geometry.size();i++) {
  
  			float area = geometry[i].get_area();;
  			if (area<CMP_EPSILON)
  				continue;
  			triangle_area_map[area_accum]=i;
  			area_accum+=area;
  		}
  
  		if (!triangle_area_map.size() || area_accum==0) {
  
  			err_dialog->set_text("Faces contain no area!");
  			err_dialog->popup_centered_minsize();
  			return;
  		}
  
  		int emissor_count=emission_amount->get_val();
  
  		for(int i=0;i<emissor_count;i++) {
  
  			float areapos = Math::random(0,area_accum);
  
  			Map<float,int>::Element *E = triangle_area_map.find_closest(areapos);
  			ERR_FAIL_COND(!E)
  			int index = E->get();
  			ERR_FAIL_INDEX(index,geometry.size());
  
  			// ok FINALLY get face
  			Face3 face = geometry[index];
  			//now compute some position inside the face...
  
  			Vector3 pos = face.get_random_point_inside();
  
  			points.push_back(pos);
  		}
  	} else {
  
  		int gcount = geometry.size();
  
  		if (gcount==0) {
  
  			err_dialog->set_text("No Faces!");
  			err_dialog->popup_centered_minsize();
  			return;
  		}
  
  		DVector<Face3>::Read r = geometry.read();
  
  		AABB aabb;
  
  		for(int i=0;i<gcount;i++) {
  
  			for(int j=0;j<3;j++) {
  
  				if (i==0 && j==0)
  					aabb.pos=r[i].vertex[j];
  				else
  					aabb.expand_to(r[i].vertex[j]);
  			}
  		}
  
  		int emissor_count=emission_amount->get_val();
  
  		for(int i=0;i<emissor_count;i++) {
  
  			int attempts=5;
  
  			for(int j=0;j<attempts;j++) {
  
  				Vector3 dir;
  				dir[Math::rand()%3]=1.0;
  				Vector3 ofs = Vector3(1,1,1)-dir;
  				ofs=(Vector3(1,1,1)-dir)*Vector3(Math::randf(),Math::randf(),Math::randf())*aabb.size;
  				ofs+=aabb.pos;
  
  				Vector3 dirv = -dir;
  				Vector3 ofsv = ofs + aabb.size * dir;
  
  				//space it a little
  				ofs -= dir;
  				ofsv += dir;
  
  				float max=-1e7,min=1e7;
  
  				for(int k=0;k<gcount;k++) {
  
  					const Face3& f3 = r[k];
  
  					Vector3 res;
  					if (f3.intersects_segment(ofs,ofsv,&res)) {
  
  						res-=ofs;
  						float d = dir.dot(res);
  
  						if (d<min)
  							min=d;
  						if (d>max)
  							max=d;
  
  					}
  				}
  
  
  				if (max<min)
  					continue; //lost attempt
  
  				float val = min + (max-min)*Math::randf();
  
  				Vector3 point = ofs + dir * val;
  
  				points.push_back(point);
  				break;
  			}
  		}
  	}
  
  	//print_line("point count: "+itos(points.size()));
  	node->set_emission_points(points);
  
  }
  
  void ParticlesEditor::_bind_methods() {
  
  	ObjectTypeDB::bind_method("_menu_option",&ParticlesEditor::_menu_option);
  	ObjectTypeDB::bind_method("_resource_seleted",&ParticlesEditor::_resource_seleted);
  	ObjectTypeDB::bind_method("_node_selected",&ParticlesEditor::_node_selected);
  	ObjectTypeDB::bind_method("_generate_emission_points",&ParticlesEditor::_generate_emission_points);
  
  	//ObjectTypeDB::bind_method("_populate",&ParticlesEditor::_populate);
  
  }
  
  ParticlesEditor::ParticlesEditor() {
  
  	particles_editor_hb = memnew ( HBoxContainer );
  	SpatialEditor::get_singleton()->add_control_to_menu_panel(particles_editor_hb);
  	options = memnew( MenuButton );
  	particles_editor_hb->add_child(options);
  	particles_editor_hb->hide();
  
  	options->set_text("Particles");
  	options->get_popup()->add_item("Generate AABB",MENU_OPTION_GENERATE_AABB);
  	options->get_popup()->add_separator();
  	options->get_popup()->add_item("Create Emitter From Mesh",MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_MESH);
  	options->get_popup()->add_item("Create Emitter From Node",MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_NODE);
  	options->get_popup()->add_item("Clear Emitter",MENU_OPTION_CLEAR_EMISSION_VOLUME);
  
  	options->get_popup()->connect("item_pressed", this,"_menu_option");
  
  	emission_dialog = memnew( ConfirmationDialog );
  	emission_dialog->set_title("Create Emitter");
  	add_child(emission_dialog);
  	Label *l = memnew(Label);
  	l->set_pos(Point2(5,5));
  	l->set_text("Emission Positions:");
  	emission_dialog->add_child(l);
  
  
  	emission_amount = memnew( SpinBox );
  	emission_amount->set_anchor(MARGIN_RIGHT,ANCHOR_END);
  	emission_amount->set_begin( Point2(20,23));
  	emission_amount->set_end( Point2(5,25));
  	emission_amount->set_min(1);
  	emission_amount->set_max(65536);
  	emission_amount->set_val(512);
  	emission_dialog->add_child(emission_amount);
  	emission_dialog->get_ok()->set_text("Create");
  	emission_dialog->connect("confirmed",this,"_generate_emission_points");
  
  	l = memnew(Label);
  	l->set_pos(Point2(5,50));
  	l->set_text("Emission Fill:");
  	emission_dialog->add_child(l);
  
  	emission_fill = memnew( OptionButton );
  	emission_fill->set_anchor(MARGIN_RIGHT,ANCHOR_END);
  	emission_fill->set_begin( Point2(20,70));
  	emission_fill->set_end( Point2(5,75));
  	emission_fill->add_item("Surface");
  	emission_fill->add_item("Volume");
  	emission_dialog->add_child(emission_fill);
  
  	err_dialog = memnew( ConfirmationDialog );
  	//err_dialog->get_cancel()->hide();
  	add_child(err_dialog);
  
  
  	emission_file_dialog = memnew( EditorFileDialog );
  	add_child(emission_file_dialog);
  	emission_file_dialog->connect("file_selected",this,"_resource_seleted");
  	emission_tree_dialog = memnew( SceneTreeDialog );
  	add_child(emission_tree_dialog);
  	emission_tree_dialog->connect("selected",this,"_node_selected");
  
  	List<String> extensions;
  	ResourceLoader::get_recognized_extensions_for_type("Mesh",&extensions);
  
  	emission_file_dialog->clear_filters();
  	for(int i=0;i<extensions.size();i++) {
  
  		emission_file_dialog->add_filter("*."+extensions[i]+" ; "+extensions[i].to_upper());
  	}
  
  	emission_file_dialog->set_mode(EditorFileDialog::MODE_OPEN_FILE);
  
  	//options->set_anchor(MARGIN_LEFT,Control::ANCHOR_END);
  	//options->set_anchor(MARGIN_RIGHT,Control::ANCHOR_END);
  
  }
  
  
  void ParticlesEditorPlugin::edit(Object *p_object) {
  
  	particles_editor->edit(p_object->cast_to<Particles>());
  }
  
  bool ParticlesEditorPlugin::handles(Object *p_object) const {
  
  	return p_object->is_type("Particles");
  }
  
  void ParticlesEditorPlugin::make_visible(bool p_visible) {
  
  	if (p_visible) {
  		particles_editor->show();
  		particles_editor->particles_editor_hb->show();
  	} else {
  		particles_editor->particles_editor_hb->hide();
  		particles_editor->hide();
  		particles_editor->edit(NULL);
  	}
  
  }
  
  ParticlesEditorPlugin::ParticlesEditorPlugin(EditorNode *p_node) {
  
  	editor=p_node;
  	particles_editor = memnew( ParticlesEditor );
  	editor->get_viewport()->add_child(particles_editor);
  
  	particles_editor->hide();
  }
  
  
  ParticlesEditorPlugin::~ParticlesEditorPlugin()
  {
  }
  
  
  