Embedding game process in editor

core/config/engine.cpp

@@ -412,6 +412,14 @@ void Engine::set_freeze_time_scale(bool p_frozen) {
 	freeze_time_scale = p_frozen;
 }
 
+void Engine::set_embedded(bool p_enabled) {
+	embedded = p_enabled;
+}
+
+bool Engine::is_embedded() const {
+	return embedded;
+}
+
 Engine::Engine() {
 	singleton = this;
 }

core/config/engine.h

@@ -87,6 +87,7 @@ class Engine {
 	bool editor_hint = false;
 	bool project_manager_hint = false;
 	bool extension_reloading = false;
+	bool embedded = false;
 
 	bool _print_header = true;
 
@@ -201,6 +202,8 @@ class Engine {
 	bool notify_frame_server_synced();
 
 	void set_freeze_time_scale(bool p_frozen);
+	void set_embedded(bool p_enabled);
+	bool is_embedded() const;
 
 	Engine();
 	virtual ~Engine();

core/core_bind.cpp

@@ -1864,6 +1864,14 @@ bool Engine::is_editor_hint() const {
 	return ::Engine::get_singleton()->is_editor_hint();
 }
 
+void Engine::set_embedded(bool p_enabled) {
+	::Engine::get_singleton()->set_embedded(p_enabled);
+}
+
+bool Engine::is_embedded() const {
+	return ::Engine::get_singleton()->is_embedded();
+}
+
 String Engine::get_write_movie_path() const {
 	return ::Engine::get_singleton()->get_write_movie_path();
 }
@@ -1941,6 +1949,7 @@ void Engine::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_script_language", "index"), &Engine::get_script_language);
 
 	ClassDB::bind_method(D_METHOD("is_editor_hint"), &Engine::is_editor_hint);
+	ClassDB::bind_method(D_METHOD("is_embedded"), &Engine::is_embedded);
 
 	ClassDB::bind_method(D_METHOD("get_write_movie_path"), &Engine::get_write_movie_path);
 

core/core_bind.h

@@ -567,6 +567,9 @@ class Engine : public Object {
 	void set_editor_hint(bool p_enabled);
 	bool is_editor_hint() const;
 
+	void set_embedded(bool p_enabled);
+	bool is_embedded() const;
+
 	// `set_write_movie_path()` is not exposed to the scripting API as changing it at run-time has no effect.
 	String get_write_movie_path() const;
 

doc/classes/DisplayServer.xml

@@ -1895,6 +1895,12 @@
 		<constant name="FEATURE_NATIVE_DIALOG_FILE_EXTRA" value="26" enum="Feature">
 			The display server supports all features of [constant FEATURE_NATIVE_DIALOG_FILE], with the added functionality of Options and native dialog file access to [code]res://[/code] and [code]user://[/code] paths. See [method file_dialog_show] and [method file_dialog_with_options_show]. [b]Windows, macOS, Linux (X11/Wayland)[/b]
 		</constant>
+		<constant name="FEATURE_WINDOW_EMBEDDING" value="27" enum="Feature">
+			Display server supports embedding a window from another process. [b]Windows, Linux (X11)[/b]
+		</constant>
+		<constant name="FEATURE_WINDOW_HIDDEN" value="28" enum="Feature">
+			Display server supports hiding a window without destroying it. [b]Windows, Linux (X11)[/b]
+		</constant>
 		<constant name="MOUSE_MODE_VISIBLE" value="0" enum="MouseMode">
 			Makes the mouse cursor visible if it is hidden.
 		</constant>
@@ -2110,8 +2116,7 @@
 			Window style is overridden, forcing sharp corners.
 			[b]Note:[/b] This flag is implemented only on Windows (11).
 		</constant>
-		<constant name="WINDOW_FLAG_MAX" value="9" enum="WindowFlags">
-			Max value of the [enum WindowFlags].
+		<constant name="WINDOW_FLAG_MAX" value="10" enum="WindowFlags">
 		</constant>
 		<constant name="WINDOW_EVENT_MOUSE_ENTER" value="0" enum="WindowEvent">
 			Sent when the mouse pointer enters the window.

doc/classes/Engine.xml

@@ -254,6 +254,12 @@
 				[b]Note:[/b] To detect whether the script is running on an editor [i]build[/i] (such as when pressing [kbd]F5[/kbd]), use [method OS.has_feature] with the [code]"editor"[/code] argument instead. [code]OS.has_feature("editor")[/code] evaluate to [code]true[/code] both when the script is running in the editor and when running the project from the editor, but returns [code]false[/code] when run from an exported project.
 			</description>
 		</method>
+		<method name="is_embedded" qualifiers="const">
+			<return type="bool" />
+			<description>
+				Returns [code]true[/code] if the game is running embedded in the editor, otherwise returns [code]false[/code]. This is useful to prevent attempting to update window mode or window flags that are not supported when running embedded in the editor.
+			</description>
+		</method>
 		<method name="is_in_physics_frame" qualifiers="const">
 			<return type="bool" />
 			<description>

doc/classes/Window.xml

@@ -761,6 +761,11 @@
 				Emitted when the mouse cursor leaves the [Window]'s visible area, that is not occluded behind other [Control]s or windows, provided its [member Viewport.gui_disable_input] is [code]false[/code] and regardless if it's currently focused or not.
 			</description>
 		</signal>
+		<signal name="position_changed">
+			<description>
+				Emitted when the [Window] moved.
+			</description>
+		</signal>
 		<signal name="theme_changed">
 			<description>
 				Emitted when the [constant NOTIFICATION_THEME_CHANGED] notification is sent.
@@ -852,7 +857,11 @@
 			[b]Note:[/b] This flag has no effect in embedded windows.
 			[b]Note:[/b] This flag is implemented only on Windows (11).
 		</constant>
-		<constant name="FLAG_MAX" value="9" enum="Flags">
+		<constant name="FLAG_HIDDEN" value="9" enum="Flags">
+			Thie window is hidden but not destroyed.
+			[b]Note:[/b] This flag is implemented only on Windows and Linux (X11).
+		</constant>
+		<constant name="FLAG_MAX" value="10" enum="Flags">
 			Max value of the [enum Flags].
 		</constant>
 		<constant name="CONTENT_SCALE_MODE_DISABLED" value="0" enum="ContentScaleMode">

editor/editor_run.cpp

@@ -34,6 +34,7 @@
 #include "editor/debugger/editor_debugger_node.h"
 #include "editor/editor_node.h"
 #include "editor/editor_settings.h"
+#include "editor/plugins/game_view_plugin.h"
 #include "editor/run_instances_dialog.h"
 #include "main/main.h"
 #include "servers/display_server.h"
@@ -234,6 +235,9 @@ Error EditorRun::run(const String &p_scene, const String &p_write_movie) {
 		List<String> instance_args(args);
 		RunInstancesDialog::get_singleton()->get_argument_list_for_instance(i, instance_args);
 		RunInstancesDialog::get_singleton()->apply_custom_features(i);
+		if (GameView::get_singleton()) {
+			GameView::get_singleton()->get_argument_list_for_instance(i, instance_args);
+		}
 
 		if (OS::get_singleton()->is_stdout_verbose()) {
 			print_line(vformat("Running: %s", exec));
@@ -286,6 +290,13 @@ void EditorRun::stop() {
 	running_scene = "";
 }
 
+OS::ProcessID EditorRun::get_current_process() const {
+	if (pids.is_empty()) {
+		return 0;
+	}
+	return pids.get(0);
+}
+
 EditorRun::EditorRun() {
 	status = STATUS_STOP;
 	running_scene = "";

editor/editor_run.h

@@ -32,6 +32,7 @@
 #define EDITOR_RUN_H
 
 #include "core/os/os.h"
+#include "servers/display_server.h"
 
 class EditorRun {
 public:
@@ -58,6 +59,7 @@ class EditorRun {
 	void stop_child_process(OS::ProcessID p_pid);
 	bool has_child_process(OS::ProcessID p_pid) const;
 	int get_child_process_count() const { return pids.size(); }
+	OS::ProcessID get_current_process() const;
 
 	EditorRun();
 };

editor/gui/editor_run_bar.cpp

@@ -293,6 +293,35 @@ void EditorRunBar::play_custom_scene(const String &p_custom) {
 	_run_scene(p_custom);
 }
 
+void EditorRunBar::restart() {
+	if (!is_playing()) {
+		return;
+	}
+
+	RunMode last_current_mode = current_mode;
+	String last_run_custom_filename = run_custom_filename;
+	String last_run_current_filename = run_current_filename;
+
+	stop_playing();
+
+	switch (last_current_mode) {
+		case RunMode::RUN_MAIN: {
+			_run_scene();
+		} break;
+		case RunMode::RUN_CUSTOM: {
+			play_custom_scene(last_run_custom_filename);
+		} break;
+		case RunMode::RUN_CURRENT: {
+			_run_scene(last_run_current_filename);
+		} break;
+		case RunMode::STOPPED: {
+			// Nothing to do.
+		} break;
+	}
+
+	current_mode = last_current_mode;
+}
+
 void EditorRunBar::stop_playing() {
 	if (editor_run.get_status() == EditorRun::STATUS_STOP) {
 		return;
@@ -344,6 +373,10 @@ void EditorRunBar::stop_child_process(OS::ProcessID p_pid) {
 	}
 }
 
+OS::ProcessID EditorRunBar::get_current_process() const {
+	return editor_run.get_current_process();
+}
+
 void EditorRunBar::set_movie_maker_enabled(bool p_enabled) {
 	write_movie_button->set_pressed(p_enabled);
 }

editor/gui/editor_run_bar.h

@@ -93,6 +93,7 @@ class EditorRunBar : public MarginContainer {
 	void play_main_scene(bool p_from_native = false);
 	void play_current_scene(bool p_reload = false);
 	void play_custom_scene(const String &p_custom);
+	void restart();
 
 	void stop_playing();
 	bool is_playing() const;
@@ -102,6 +103,7 @@ class EditorRunBar : public MarginContainer {
 
 	OS::ProcessID has_child_process(OS::ProcessID p_pid) const;
 	void stop_child_process(OS::ProcessID p_pid);
+	OS::ProcessID get_current_process() const;
 
 	void set_movie_maker_enabled(bool p_enabled);
 	bool is_movie_maker_enabled() const;