initial project setup

globals/scene_stack.gd

@@ -0,0 +1,36 @@
+extends Node
+
+
+## The stack of scenes.
+var scenes: Array[Node]
+
+
+func _enter_tree() -> void:
+	scenes.push_back(get_tree().current_scene)
+
+
+## Pushes a new scene onto the stack. It will replace the current scene until it is popped.
+func push_scene(scene: Node) -> void:
+	scenes.push_back(scene)
+	get_tree().current_scene = scene
+	get_tree().scene_changed.emit()
+
+
+## Pops the current scene off the stack, returning to the scene below it. If there are no
+## scenes left, the game quits.
+func pop_scene() -> void:
+	scenes.pop_back().queue_free()
+	if scenes.is_empty():
+		get_tree().quit()
+		return
+	
+	get_tree().current_scene = scenes.back()
+	get_tree().scene_changed.emit()
+
+
+## Swaps the current scene with a new scene.
+func swap_scene(scene: Node) -> void:
+	scenes.pop_back().queue_free()
+	scenes.push_back(scene)
+	get_tree().current_scene = scene
+	get_tree().scene_changed.emit()