support for 2D shadow casters

Added support for 2D shadow casters.

*DANGER* Shaders in CanvasItem CHANGED, if you are using shader in a
CanvasItem and pull this, you will lose them. Shaders now work through a
2D material system similar to 3D. If you don't want to lose the 2D
shader code, save the shader as a .shd, then create a material in
CanvasItem and re-assign the shader.

3 files changed, 588 insertions, 0 deletions

diff --git a/tools/editor/plugins/collision_polygon_2d_editor_plugin.cpp b/tools/editor/plugins/collision_polygon_2d_editor_plugin.cpp
index ed228e9a1c..dab6df9a39 100644
--- a/tools/editor/plugins/collision_polygon_2d_editor_plugin.cpp
+++ b/tools/editor/plugins/collision_polygon_2d_editor_plugin.cpp
@@ -4,6 +4,7 @@
 #include "os/file_access.h"
 #include "tools/editor/editor_settings.h"
 
+
 void CollisionPolygon2DEditor::_notification(int p_what) {
 
 	switch(p_what) {
diff --git a/tools/editor/plugins/light_occluder_2d_editor_plugin.cpp b/tools/editor/plugins/light_occluder_2d_editor_plugin.cpp
new file mode 100644
index 0000000000..c1fb81b66a
--- /dev/null
+++ b/tools/editor/plugins/light_occluder_2d_editor_plugin.cpp
@@ -0,0 +1,500 @@
+#include "light_occluder_2d_editor_plugin.h"
+
+#include "canvas_item_editor_plugin.h"
+#include "os/file_access.h"
+#include "tools/editor/editor_settings.h"
+
+void LightOccluder2DEditor::_notification(int p_what) {
+
+	switch(p_what) {
+
+		case NOTIFICATION_READY: {
+
+			button_create->set_icon( get_icon("Edit","EditorIcons"));
+			button_edit->set_icon( get_icon("MovePoint","EditorIcons"));
+			button_edit->set_pressed(true);
+			get_tree()->connect("node_removed",this,"_node_removed");
+			create_poly->connect("confirmed",this,"_create_poly");
+
+		} break;
+		case NOTIFICATION_FIXED_PROCESS: {
+
+
+		} break;
+	}
+
+}
+void LightOccluder2DEditor::_node_removed(Node *p_node) {
+
+	if(p_node==node) {
+		node=NULL;
+		hide();
+		canvas_item_editor->get_viewport_control()->update();
+	}
+
+}
+
+
+Vector2 LightOccluder2DEditor::snap_point(const Vector2& p_point) const {
+
+	if (canvas_item_editor->is_snap_active()) {
+
+		return p_point.snapped(Vector2(1,1)*canvas_item_editor->get_snap());
+
+	} else {
+		return p_point;
+	}
+}
+
+void LightOccluder2DEditor::_menu_option(int p_option) {
+
+	switch(p_option) {
+
+		case MODE_CREATE: {
+
+			mode=MODE_CREATE;
+			button_create->set_pressed(true);
+			button_edit->set_pressed(false);
+		} break;
+		case MODE_EDIT: {
+
+			mode=MODE_EDIT;
+			button_create->set_pressed(false);
+			button_edit->set_pressed(true);
+		} break;
+
+	}
+}
+
+void LightOccluder2DEditor::_wip_close(bool p_closed) {
+
+	undo_redo->create_action("Create Poly");
+	undo_redo->add_undo_method(node->get_occluder_polygon().ptr(),"set_polygon",node->get_occluder_polygon()->get_polygon());
+	undo_redo->add_do_method(node->get_occluder_polygon().ptr(),"set_polygon",wip);
+	undo_redo->add_undo_method(node->get_occluder_polygon().ptr(),"set_closed",node->get_occluder_polygon()->is_closed());
+	undo_redo->add_do_method(node->get_occluder_polygon().ptr(),"set_closed",p_closed);
+
+	undo_redo->add_do_method(canvas_item_editor->get_viewport_control(),"update");
+	undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(),"update");
+	undo_redo->commit_action();
+	wip.clear();
+	wip_active=false;
+	mode=MODE_EDIT;
+	button_edit->set_pressed(true);
+	button_create->set_pressed(false);
+	edited_point=-1;
+}
+
+bool LightOccluder2DEditor::forward_input_event(const InputEvent& p_event) {
+
+
+	if (!node)
+		return false;
+
+	if (node->get_occluder_polygon().is_null()) {
+		if (p_event.type==InputEvent::MOUSE_BUTTON && p_event.mouse_button.button_index==1 && p_event.mouse_button.pressed) {
+			create_poly->set_text("No OccluderPolygon2D resource on this node.\nCreate and assign one?");
+			create_poly->popup_centered_minsize();
+		}
+		return false;
+	}
+	switch(p_event.type) {
+
+		case InputEvent::MOUSE_BUTTON: {
+
+			const InputEventMouseButton &mb=p_event.mouse_button;
+
+			Matrix32 xform = canvas_item_editor->get_canvas_transform() * node->get_global_transform();
+
+
+			Vector2 gpoint = Point2(mb.x,mb.y);
+			Vector2 cpoint = canvas_item_editor->get_canvas_transform().affine_inverse().xform(gpoint);
+			cpoint=snap_point(cpoint);
+			cpoint = node->get_global_transform().affine_inverse().xform(cpoint);
+
+			Vector<Vector2> poly = Variant(node->get_occluder_polygon()->get_polygon());
+
+			//first check if a point is to be added (segment split)
+			real_t grab_treshold=EDITOR_DEF("poly_editor/point_grab_radius",8);
+
+			switch(mode) {
+
+
+				case MODE_CREATE: {
+
+					if (mb.button_index==BUTTON_LEFT && mb.pressed) {
+
+
+						if (!wip_active) {
+
+							wip.clear();
+							wip.push_back( cpoint );
+							wip_active=true;
+							edited_point_pos=cpoint;
+							canvas_item_editor->get_viewport_control()->update();
+							edited_point=1;
+							return true;
+						} else {
+
+
+							if (wip.size()>1 && xform.xform(wip[0]).distance_to(gpoint)<grab_treshold) {
+								//wip closed
+								_wip_close(true);
+
+								return true;
+							} else if (wip.size()>1 && xform.xform(wip[wip.size()-1]).distance_to(gpoint)<grab_treshold) {
+									//wip closed
+									_wip_close(false);
+									return true;
+
+							} else {
+
+								wip.push_back( cpoint );
+								edited_point=wip.size();
+								canvas_item_editor->get_viewport_control()->update();
+								return true;
+
+								//add wip point
+							}
+						}
+					} else if (mb.button_index==BUTTON_RIGHT && mb.pressed && wip_active) {
+						_wip_close(true);
+					}
+
+
+
+				} break;
+
+				case MODE_EDIT: {
+
+					if (mb.button_index==BUTTON_LEFT) {
+						if (mb.pressed) {
+
+							if (mb.mod.control) {
+
+
+								if (poly.size() < 3) {
+
+									undo_redo->create_action("Edit Poly");
+									undo_redo->add_undo_method(node->get_occluder_polygon().ptr(),"set_polygon",poly);
+									poly.push_back(cpoint);
+									undo_redo->add_do_method(node->get_occluder_polygon().ptr(),"set_polygon",poly);
+									undo_redo->add_do_method(canvas_item_editor->get_viewport_control(),"update");
+									undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(),"update");
+									undo_redo->commit_action();
+									return true;
+								}
+
+								//search edges
+								int closest_idx=-1;
+								Vector2 closest_pos;
+								real_t closest_dist=1e10;
+								for(int i=0;i<poly.size();i++) {
+
+									Vector2 points[2] ={ xform.xform(poly[i]),
+										xform.xform(poly[(i+1)%poly.size()]) };
+
+									Vector2 cp = Geometry::get_closest_point_to_segment_2d(gpoint,points);
+									if (cp.distance_squared_to(points[0])<CMP_EPSILON2 || cp.distance_squared_to(points[1])<CMP_EPSILON2)
+										continue; //not valid to reuse point
+
+									real_t d = cp.distance_to(gpoint);
+									if (d<closest_dist && d<grab_treshold) {
+										closest_dist=d;
+										closest_pos=cp;
+										closest_idx=i;
+									}
+
+
+								}
+
+								if (closest_idx>=0) {
+
+									pre_move_edit=poly;
+									poly.insert(closest_idx+1,xform.affine_inverse().xform(closest_pos));
+									edited_point=closest_idx+1;
+									edited_point_pos=xform.affine_inverse().xform(closest_pos);
+									node->get_occluder_polygon()->set_polygon(Variant(poly));
+									canvas_item_editor->get_viewport_control()->update();
+									return true;
+								}
+							} else {
+
+								//look for points to move
+
+								int closest_idx=-1;
+								Vector2 closest_pos;
+								real_t closest_dist=1e10;
+								for(int i=0;i<poly.size();i++) {
+
+									Vector2 cp =xform.xform(poly[i]);
+
+									real_t d = cp.distance_to(gpoint);
+									if (d<closest_dist && d<grab_treshold) {
+										closest_dist=d;
+										closest_pos=cp;
+										closest_idx=i;
+									}
+
+								}
+
+								if (closest_idx>=0) {
+
+									pre_move_edit=poly;
+									edited_point=closest_idx;
+									edited_point_pos=xform.affine_inverse().xform(closest_pos);
+									canvas_item_editor->get_viewport_control()->update();
+									return true;
+								}
+							}
+						} else {
+
+							if (edited_point!=-1) {
+
+								//apply
+
+								ERR_FAIL_INDEX_V(edited_point,poly.size(),false);
+								poly[edited_point]=edited_point_pos;
+								undo_redo->create_action("Edit Poly");
+								undo_redo->add_do_method(node->get_occluder_polygon().ptr(),"set_polygon",poly);
+								undo_redo->add_undo_method(node->get_occluder_polygon().ptr(),"set_polygon",pre_move_edit);
+								undo_redo->add_do_method(canvas_item_editor->get_viewport_control(),"update");
+								undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(),"update");
+								undo_redo->commit_action();
+
+								edited_point=-1;
+								return true;
+							}
+						}
+					} if (mb.button_index==BUTTON_RIGHT && mb.pressed && edited_point==-1) {
+
+
+
+						int closest_idx=-1;
+						Vector2 closest_pos;
+						real_t closest_dist=1e10;
+						for(int i=0;i<poly.size();i++) {
+
+							Vector2 cp =xform.xform(poly[i]);
+
+							real_t d = cp.distance_to(gpoint);
+							if (d<closest_dist && d<grab_treshold) {
+								closest_dist=d;
+								closest_pos=cp;
+								closest_idx=i;
+							}
+
+						}
+
+						if (closest_idx>=0) {
+
+
+							undo_redo->create_action("Edit Poly (Remove Point)");
+							undo_redo->add_undo_method(node->get_occluder_polygon().ptr(),"set_polygon",poly);
+							poly.remove(closest_idx);
+							undo_redo->add_do_method(node->get_occluder_polygon().ptr(),"set_polygon",poly);
+							undo_redo->add_do_method(canvas_item_editor->get_viewport_control(),"update");
+							undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(),"update");
+							undo_redo->commit_action();
+							return true;
+						}
+
+					}
+
+
+
+				} break;
+			}
+
+
+
+		} break;
+		case InputEvent::MOUSE_MOTION: {
+
+			const InputEventMouseMotion &mm=p_event.mouse_motion;
+
+			if (edited_point!=-1 && (wip_active || mm.button_mask&BUTTON_MASK_LEFT)) {
+
+				Vector2 gpoint = Point2(mm.x,mm.y);
+				Vector2 cpoint = canvas_item_editor->get_canvas_transform().affine_inverse().xform(gpoint);
+				cpoint=snap_point(cpoint);
+				edited_point_pos = node->get_global_transform().affine_inverse().xform(cpoint);
+
+				canvas_item_editor->get_viewport_control()->update();
+
+			}
+
+		} break;
+	}
+
+	return false;
+}
+void LightOccluder2DEditor::_canvas_draw() {
+
+	if (!node || !node->get_occluder_polygon().is_valid())
+		return;
+
+	Control *vpc = canvas_item_editor->get_viewport_control();
+
+	Vector<Vector2> poly;
+
+	if (wip_active)
+		poly=wip;
+	else
+		poly=Variant(node->get_occluder_polygon()->get_polygon());
+
+
+	Matrix32 xform = canvas_item_editor->get_canvas_transform() * node->get_global_transform();
+	Ref<Texture> handle= get_icon("EditorHandle","EditorIcons");
+
+	int len = poly.size();
+
+	for(int i=0;i<poly.size();i++) {
+
+
+		Vector2 p,p2;
+		p = i==edited_point ? edited_point_pos : poly[i];
+		if ((wip_active && i==poly.size()-1) || (((i+1)%poly.size())==edited_point))
+			p2=edited_point_pos;
+		else
+			p2 = poly[(i+1)%poly.size()];
+
+		Vector2 point = xform.xform(p);
+		Vector2 next_point = xform.xform(p2);
+
+		Color col=Color(1,0.3,0.1,0.8);
+
+		if (i==poly.size()-1 && (!node->get_occluder_polygon()->is_closed() || wip_active)) {
+
+		} else {
+			vpc->draw_line(point,next_point,col,2);
+		}
+		vpc->draw_texture(handle,point-handle->get_size()*0.5);
+	}
+}
+
+
+
+void LightOccluder2DEditor::edit(Node *p_collision_polygon) {
+
+	if (!canvas_item_editor) {
+		canvas_item_editor=CanvasItemEditor::get_singleton();
+	}
+
+	if (p_collision_polygon) {
+
+		node=p_collision_polygon->cast_to<LightOccluder2D>();
+		if (!canvas_item_editor->get_viewport_control()->is_connected("draw",this,"_canvas_draw"))
+			canvas_item_editor->get_viewport_control()->connect("draw",this,"_canvas_draw");
+		wip.clear();
+		wip_active=false;
+		edited_point=-1;
+
+	} else {
+		node=NULL;
+
+		if (canvas_item_editor->get_viewport_control()->is_connected("draw",this,"_canvas_draw"))
+			canvas_item_editor->get_viewport_control()->disconnect("draw",this,"_canvas_draw");
+
+	}
+
+}
+
+void LightOccluder2DEditor::_create_poly()  {
+
+	undo_redo->create_action("Create Occluder Polygon");
+	undo_redo->add_do_method(node,"set_occluder_polygon",Ref<OccluderPolygon2D>(memnew( OccluderPolygon2D)));
+	undo_redo->add_undo_method(node,"set_occluder_polygon",Variant(REF()));
+	undo_redo->commit_action();
+}
+
+void LightOccluder2DEditor::_bind_methods() {
+
+	ObjectTypeDB::bind_method(_MD("_menu_option"),&LightOccluder2DEditor::_menu_option);
+	ObjectTypeDB::bind_method(_MD("_canvas_draw"),&LightOccluder2DEditor::_canvas_draw);
+	ObjectTypeDB::bind_method(_MD("_node_removed"),&LightOccluder2DEditor::_node_removed);
+	ObjectTypeDB::bind_method(_MD("_create_poly"),&LightOccluder2DEditor::_create_poly);
+
+}
+
+
+LightOccluder2DEditor::LightOccluder2DEditor(EditorNode *p_editor) {
+
+	canvas_item_editor=NULL;
+	editor=p_editor;
+	undo_redo = editor->get_undo_redo();
+
+	add_child( memnew( VSeparator ));
+	button_create = memnew( ToolButton );
+	add_child(button_create);
+	button_create->connect("pressed",this,"_menu_option",varray(MODE_CREATE));
+	button_create->set_toggle_mode(true);
+	button_create->set_tooltip("Create a new polygon from scratch");
+
+	button_edit = memnew( ToolButton );
+	add_child(button_edit);
+	button_edit->connect("pressed",this,"_menu_option",varray(MODE_EDIT));
+	button_edit->set_toggle_mode(true);
+	button_edit->set_tooltip("Edit existing polygon:\nLMB: Move Point.\nCtrl+LMB: Split Segment.\nRMB: Erase Point.");
+
+	create_poly = memnew( ConfirmationDialog );
+	add_child(create_poly);
+	create_poly->get_ok()->set_text("Create");
+
+
+	//add_constant_override("separation",0);
+
+#if 0
+	options = memnew( MenuButton );
+	add_child(options);
+	options->set_area_as_parent_rect();
+	options->set_text("Polygon");
+	//options->get_popup()->add_item("Parse BBCODE",PARSE_BBCODE);
+	options->get_popup()->connect("item_pressed", this,"_menu_option");
+#endif
+
+	mode = MODE_EDIT;
+	wip_active=false;
+
+}
+
+
+void LightOccluder2DEditorPlugin::edit(Object *p_object) {
+
+	collision_polygon_editor->edit(p_object->cast_to<Node>());
+}
+
+bool LightOccluder2DEditorPlugin::handles(Object *p_object) const {
+
+	return p_object->is_type("LightOccluder2D");
+}
+
+void LightOccluder2DEditorPlugin::make_visible(bool p_visible) {
+
+	if (p_visible) {
+		collision_polygon_editor->show();
+	} else {
+
+		collision_polygon_editor->hide();
+		collision_polygon_editor->edit(NULL);
+	}
+
+}
+
+LightOccluder2DEditorPlugin::LightOccluder2DEditorPlugin(EditorNode *p_node) {
+
+	editor=p_node;
+	collision_polygon_editor = memnew( LightOccluder2DEditor(p_node) );
+	CanvasItemEditor::get_singleton()->add_control_to_menu_panel(collision_polygon_editor);
+
+	collision_polygon_editor->hide();
+
+
+
+}
+
+
+LightOccluder2DEditorPlugin::~LightOccluder2DEditorPlugin()
+{
+}
+
diff --git a/tools/editor/plugins/light_occluder_2d_editor_plugin.h b/tools/editor/plugins/light_occluder_2d_editor_plugin.h
new file mode 100644
index 0000000000..5fb5631d05
--- /dev/null
+++ b/tools/editor/plugins/light_occluder_2d_editor_plugin.h
@@ -0,0 +1,87 @@
+#ifndef LIGHT_OCCLUDER_2D_EDITOR_PLUGIN_H
+#define LIGHT_OCCLUDER_2D_EDITOR_PLUGIN_H
+
+
+
+#include "tools/editor/editor_plugin.h"
+#include "tools/editor/editor_node.h"
+#include "scene/2d/light_occluder_2d.h"
+#include "scene/gui/tool_button.h"
+#include "scene/gui/button_group.h"
+
+/**
+	@author Juan Linietsky <reduzio@gmail.com>
+*/
+class CanvasItemEditor;
+
+class LightOccluder2DEditor : public HBoxContainer {
+
+	OBJ_TYPE(LightOccluder2DEditor, HBoxContainer );
+
+	UndoRedo *undo_redo;
+	enum Mode {
+
+		MODE_CREATE,
+		MODE_EDIT,
+
+	};
+
+	Mode mode;
+
+	ToolButton *button_create;
+	ToolButton *button_edit;
+
+	CanvasItemEditor *canvas_item_editor;
+	EditorNode *editor;
+	Panel *panel;
+	LightOccluder2D *node;
+	MenuButton *options;
+
+	int edited_point;
+	Vector2 edited_point_pos;
+	Vector<Vector2> pre_move_edit;
+	Vector<Vector2> wip;
+	bool wip_active;
+
+	ConfirmationDialog *create_poly;
+
+	void _wip_close(bool p_closed);
+	void _canvas_draw();
+	void _menu_option(int p_option);
+	void _create_poly();
+
+protected:
+	void _notification(int p_what);
+	void _node_removed(Node *p_node);
+	static void _bind_methods();
+public:
+
+	Vector2 snap_point(const Vector2& p_point) const;
+	bool forward_input_event(const InputEvent& p_event);
+	void edit(Node *p_collision_polygon);
+	LightOccluder2DEditor(EditorNode *p_editor);
+};
+
+class LightOccluder2DEditorPlugin : public EditorPlugin {
+
+	OBJ_TYPE( LightOccluder2DEditorPlugin, EditorPlugin );
+
+	LightOccluder2DEditor *collision_polygon_editor;
+	EditorNode *editor;
+
+public:
+
+	virtual bool forward_input_event(const InputEvent& p_event) { return collision_polygon_editor->forward_input_event(p_event); }
+
+	virtual String get_name() const { return "LightOccluder2D"; }
+	bool has_main_screen() const { return false; }
+	virtual void edit(Object *p_node);
+	virtual bool handles(Object *p_node) const;
+	virtual void make_visible(bool p_visible);
+
+	LightOccluder2DEditorPlugin(EditorNode *p_node);
+	~LightOccluder2DEditorPlugin();
+
+};
+
+#endif // LIGHT_OCCLUDER_2D_EDITOR_PLUGIN_H