text: /*************************************************************************/
  /*  gpu_particles_2d_editor_plugin.cpp                                   */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2020 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 "gpu_particles_2d_editor_plugin.h"
  
  #include "canvas_item_editor_plugin.h"
  #include "core/io/image_loader.h"
  #include "scene/2d/cpu_particles_2d.h"
  #include "scene/gui/separator.h"
  #include "scene/resources/particles_material.h"
  
  void GPUParticles2DEditorPlugin::edit(Object *p_object) {
  	particles = Object::cast_to<GPUParticles2D>(p_object);
  }
  
  bool GPUParticles2DEditorPlugin::handles(Object *p_object) const {
  	return p_object->is_class("GPUParticles2D");
  }
  
  void GPUParticles2DEditorPlugin::make_visible(bool p_visible) {
  	if (p_visible) {
  		toolbar->show();
  	} else {
  		toolbar->hide();
  	}
  }
  
  void GPUParticles2DEditorPlugin::_file_selected(const String &p_file) {
  	source_emission_file = p_file;
  	emission_mask->popup_centered();
  }
  
  void GPUParticles2DEditorPlugin::_menu_callback(int p_idx) {
  	switch (p_idx) {
  		case MENU_GENERATE_VISIBILITY_RECT: {
  			float gen_time = particles->get_lifetime();
  			if (gen_time < 1.0) {
  				generate_seconds->set_value(1.0);
  			} else {
  				generate_seconds->set_value(trunc(gen_time) + 1.0);
  			}
  			generate_visibility_rect->popup_centered();
  		} break;
  		case MENU_LOAD_EMISSION_MASK: {
  			file->popup_file_dialog();
  
  		} break;
  		case MENU_CLEAR_EMISSION_MASK: {
  			emission_mask->popup_centered();
  		} break;
  		case MENU_OPTION_CONVERT_TO_CPU_PARTICLES: {
  			CPUParticles2D *cpu_particles = memnew(CPUParticles2D);
  			cpu_particles->convert_from_particles(particles);
  			cpu_particles->set_name(particles->get_name());
  			cpu_particles->set_transform(particles->get_transform());
  			cpu_particles->set_visible(particles->is_visible());
  			cpu_particles->set_pause_mode(particles->get_pause_mode());
  			cpu_particles->set_z_index(particles->get_z_index());
  
  			UndoRedo *ur = EditorNode::get_singleton()->get_undo_redo();
  			ur->create_action(TTR("Convert to CPUParticles2D"));
  			ur->add_do_method(EditorNode::get_singleton()->get_scene_tree_dock(), "replace_node", particles, cpu_particles, true, false);
  			ur->add_do_reference(cpu_particles);
  			ur->add_undo_method(EditorNode::get_singleton()->get_scene_tree_dock(), "replace_node", cpu_particles, particles, false, false);
  			ur->add_undo_reference(particles);
  			ur->commit_action();
  
  		} break;
  		case MENU_RESTART: {
  			particles->restart();
  		}
  	}
  }
  
  void GPUParticles2DEditorPlugin::_generate_visibility_rect() {
  	float time = generate_seconds->get_value();
  
  	float running = 0.0;
  
  	EditorProgress ep("gen_vrect", TTR("Generating Visibility Rect"), int(time));
  
  	bool was_emitting = particles->is_emitting();
  	if (!was_emitting) {
  		particles->set_emitting(true);
  		OS::get_singleton()->delay_usec(1000);
  	}
  
  	Rect2 rect;
  	while (running < time) {
  		uint64_t ticks = OS::get_singleton()->get_ticks_usec();
  		ep.step("Generating...", int(running), true);
  		OS::get_singleton()->delay_usec(1000);
  
  		Rect2 capture = particles->capture_rect();
  		if (rect == Rect2()) {
  			rect = capture;
  		} else {
  			rect = rect.merge(capture);
  		}
  
  		running += (OS::get_singleton()->get_ticks_usec() - ticks) / 1000000.0;
  	}
  
  	if (!was_emitting) {
  		particles->set_emitting(false);
  	}
  
  	undo_redo->create_action(TTR("Generate Visibility Rect"));
  	undo_redo->add_do_method(particles, "set_visibility_rect", rect);
  	undo_redo->add_undo_method(particles, "set_visibility_rect", particles->get_visibility_rect());
  	undo_redo->commit_action();
  }
  
  void GPUParticles2DEditorPlugin::_generate_emission_mask() {
  	Ref<ParticlesMaterial> pm = particles->get_process_material();
  	if (!pm.is_valid()) {
  		EditorNode::get_singleton()->show_warning(TTR("Can only set point into a ParticlesMaterial process material"));
  		return;
  	}
  
  	Ref<Image> img;
  	img.instance();
  	Error err = ImageLoader::load_image(source_emission_file, img);
  	ERR_FAIL_COND_MSG(err != OK, "Error loading image '" + source_emission_file + "'.");
  
  	if (img->is_compressed()) {
  		img->decompress();
  	}
  	img->convert(Image::FORMAT_RGBA8);
  	ERR_FAIL_COND(img->get_format() != Image::FORMAT_RGBA8);
  	Size2i s = Size2(img->get_width(), img->get_height());
  	ERR_FAIL_COND(s.width == 0 || s.height == 0);
  
  	Vector<Point2> valid_positions;
  	Vector<Point2> valid_normals;
  	Vector<uint8_t> valid_colors;
  
  	valid_positions.resize(s.width * s.height);
  
  	EmissionMode emode = (EmissionMode)emission_mask_mode->get_selected();
  
  	if (emode == EMISSION_MODE_BORDER_DIRECTED) {
  		valid_normals.resize(s.width * s.height);
  	}
  
  	bool capture_colors = emission_colors->is_pressed();
  
  	if (capture_colors) {
  		valid_colors.resize(s.width * s.height * 4);
  	}
  
  	int vpc = 0;
  
  	{
  		Vector<uint8_t> data = img->get_data();
  		const uint8_t *r = data.ptr();
  
  		for (int i = 0; i < s.width; i++) {
  			for (int j = 0; j < s.height; j++) {
  				uint8_t a = r[(j * s.width + i) * 4 + 3];
  
  				if (a > 128) {
  					if (emode == EMISSION_MODE_SOLID) {
  						if (capture_colors) {
  							valid_colors.write[vpc * 4 + 0] = r[(j * s.width + i) * 4 + 0];
  							valid_colors.write[vpc * 4 + 1] = r[(j * s.width + i) * 4 + 1];
  							valid_colors.write[vpc * 4 + 2] = r[(j * s.width + i) * 4 + 2];
  							valid_colors.write[vpc * 4 + 3] = r[(j * s.width + i) * 4 + 3];
  						}
  						valid_positions.write[vpc++] = Point2(i, j);
  
  					} else {
  						bool on_border = false;
  						for (int x = i - 1; x <= i + 1; x++) {
  							for (int y = j - 1; y <= j + 1; y++) {
  								if (x < 0 || y < 0 || x >= s.width || y >= s.height || r[(y * s.width + x) * 4 + 3] <= 128) {
  									on_border = true;
  									break;
  								}
  							}
  
  							if (on_border) {
  								break;
  							}
  						}
  
  						if (on_border) {
  							valid_positions.write[vpc] = Point2(i, j);
  
  							if (emode == EMISSION_MODE_BORDER_DIRECTED) {
  								Vector2 normal;
  								for (int x = i - 2; x <= i + 2; x++) {
  									for (int y = j - 2; y <= j + 2; y++) {
  										if (x == i && y == j) {
  											continue;
  										}
  
  										if (x < 0 || y < 0 || x >= s.width || y >= s.height || r[(y * s.width + x) * 4 + 3] <= 128) {
  											normal += Vector2(x - i, y - j).normalized();
  										}
  									}
  								}
  
  								normal.normalize();
  								valid_normals.write[vpc] = normal;
  							}
  
  							if (capture_colors) {
  								valid_colors.write[vpc * 4 + 0] = r[(j * s.width + i) * 4 + 0];
  								valid_colors.write[vpc * 4 + 1] = r[(j * s.width + i) * 4 + 1];
  								valid_colors.write[vpc * 4 + 2] = r[(j * s.width + i) * 4 + 2];
  								valid_colors.write[vpc * 4 + 3] = r[(j * s.width + i) * 4 + 3];
  							}
  
  							vpc++;
  						}
  					}
  				}
  			}
  		}
  	}
  
  	valid_positions.resize(vpc);
  	if (valid_normals.size()) {
  		valid_normals.resize(vpc);
  	}
  
  	ERR_FAIL_COND_MSG(valid_positions.size() == 0, "No pixels with transparency > 128 in image...");
  
  	Vector<uint8_t> texdata;
  
  	int w = 2048;
  	int h = (vpc / 2048) + 1;
  
  	texdata.resize(w * h * 2 * sizeof(float));
  
  	{
  		uint8_t *tw = texdata.ptrw();
  		float *twf = (float *)tw;
  		for (int i = 0; i < vpc; i++) {
  			twf[i * 2 + 0] = valid_positions[i].x;
  			twf[i * 2 + 1] = valid_positions[i].y;
  		}
  	}
  
  	img.instance();
  	img->create(w, h, false, Image::FORMAT_RGF, texdata);
  
  	Ref<ImageTexture> imgt;
  	imgt.instance();
  	imgt->create_from_image(img);
  
  	pm->set_emission_point_texture(imgt);
  	pm->set_emission_point_count(vpc);
  
  	if (capture_colors) {
  		Vector<uint8_t> colordata;
  		colordata.resize(w * h * 4); //use RG texture
  
  		{
  			uint8_t *tw = colordata.ptrw();
  			for (int i = 0; i < vpc * 4; i++) {
  				tw[i] = valid_colors[i];
  			}
  		}
  
  		img.instance();
  		img->create(w, h, false, Image::FORMAT_RGBA8, colordata);
  
  		imgt.instance();
  		imgt->create_from_image(img);
  		pm->set_emission_color_texture(imgt);
  	}
  
  	if (valid_normals.size()) {
  		pm->set_emission_shape(ParticlesMaterial::EMISSION_SHAPE_DIRECTED_POINTS);
  
  		Vector<uint8_t> normdata;
  		normdata.resize(w * h * 2 * sizeof(float)); //use RG texture
  
  		{
  			uint8_t *tw = normdata.ptrw();
  			float *twf = (float *)tw;
  			for (int i = 0; i < vpc; i++) {
  				twf[i * 2 + 0] = valid_normals[i].x;
  				twf[i * 2 + 1] = valid_normals[i].y;
  			}
  		}
  
  		img.instance();
  		img->create(w, h, false, Image::FORMAT_RGF, normdata);
  
  		imgt.instance();
  		imgt->create_from_image(img);
  		pm->set_emission_normal_texture(imgt);
  
  	} else {
  		pm->set_emission_shape(ParticlesMaterial::EMISSION_SHAPE_POINTS);
  	}
  }
  
  void GPUParticles2DEditorPlugin::_notification(int p_what) {
  	if (p_what == NOTIFICATION_ENTER_TREE) {
  		menu->get_popup()->connect("id_pressed", callable_mp(this, &GPUParticles2DEditorPlugin::_menu_callback));
  		menu->set_icon(menu->get_theme_icon("GPUParticles2D", "EditorIcons"));
  		file->connect("file_selected", callable_mp(this, &GPUParticles2DEditorPlugin::_file_selected));
  	}
  }
  
  void GPUParticles2DEditorPlugin::_bind_methods() {
  }
  
  GPUParticles2DEditorPlugin::GPUParticles2DEditorPlugin(EditorNode *p_node) {
  	particles = nullptr;
  	editor = p_node;
  	undo_redo = editor->get_undo_redo();
  
  	toolbar = memnew(HBoxContainer);
  	add_control_to_container(CONTAINER_CANVAS_EDITOR_MENU, toolbar);
  	toolbar->hide();
  
  	toolbar->add_child(memnew(VSeparator));
  
  	menu = memnew(MenuButton);
  	menu->get_popup()->add_item(TTR("Restart"), MENU_RESTART);
  	menu->get_popup()->add_item(TTR("Generate Visibility Rect"), MENU_GENERATE_VISIBILITY_RECT);
  	menu->get_popup()->add_item(TTR("Load Emission Mask"), MENU_LOAD_EMISSION_MASK);
  	//	menu->get_popup()->add_item(TTR("Clear Emission Mask"), MENU_CLEAR_EMISSION_MASK);
  	menu->get_popup()->add_item(TTR("Convert to CPUParticles2D"), MENU_OPTION_CONVERT_TO_CPU_PARTICLES);
  	menu->set_text(TTR("GPUParticles2D"));
  	menu->set_switch_on_hover(true);
  	toolbar->add_child(menu);
  
  	file = memnew(EditorFileDialog);
  	List<String> ext;
  	ImageLoader::get_recognized_extensions(&ext);
  	for (List<String>::Element *E = ext.front(); E; E = E->next()) {
  		file->add_filter("*." + E->get() + "; " + E->get().to_upper());
  	}
  	file->set_file_mode(EditorFileDialog::FILE_MODE_OPEN_FILE);
  	toolbar->add_child(file);
  
  	epoints = memnew(SpinBox);
  	epoints->set_min(1);
  	epoints->set_max(8192);
  	epoints->set_step(1);
  	epoints->set_value(512);
  	file->get_vbox()->add_margin_child(TTR("Generated Point Count:"), epoints);
  
  	generate_visibility_rect = memnew(ConfirmationDialog);
  	generate_visibility_rect->set_title(TTR("Generate Visibility Rect"));
  	VBoxContainer *genvb = memnew(VBoxContainer);
  	generate_visibility_rect->add_child(genvb);
  	generate_seconds = memnew(SpinBox);
  	genvb->add_margin_child(TTR("Generation Time (sec):"), generate_seconds);
  	generate_seconds->set_min(0.1);
  	generate_seconds->set_max(25);
  	generate_seconds->set_value(2);
  
  	toolbar->add_child(generate_visibility_rect);
  
  	generate_visibility_rect->connect("confirmed", callable_mp(this, &GPUParticles2DEditorPlugin::_generate_visibility_rect));
  
  	emission_mask = memnew(ConfirmationDialog);
  	emission_mask->set_title(TTR("Load Emission Mask"));
  	VBoxContainer *emvb = memnew(VBoxContainer);
  	emission_mask->add_child(emvb);
  	emission_mask_mode = memnew(OptionButton);
  	emvb->add_margin_child(TTR("Emission Mask"), emission_mask_mode);
  	emission_mask_mode->add_item(TTR("Solid Pixels"), EMISSION_MODE_SOLID);
  	emission_mask_mode->add_item(TTR("Border Pixels"), EMISSION_MODE_BORDER);
  	emission_mask_mode->add_item(TTR("Directed Border Pixels"), EMISSION_MODE_BORDER_DIRECTED);
  	emission_colors = memnew(CheckBox);
  	emission_colors->set_text(TTR("Capture from Pixel"));
  	emvb->add_margin_child(TTR("Emission Colors"), emission_colors);
  
  	toolbar->add_child(emission_mask);
  
  	emission_mask->connect("confirmed", callable_mp(this, &GPUParticles2DEditorPlugin::_generate_emission_mask));
  }
  
  GPUParticles2DEditorPlugin::~GPUParticles2DEditorPlugin() {
  }
  