add main menu and scene manager

core/scene_manager/scene_config.gd

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+class_name SceneConfig
+extends Resource
+
+enum SceneName { MAIN_MENU, GAME }
+
+@export var scenes: Dictionary[SceneName, PackedScene] = {
+}

core/scene_manager/scene_config.gd.uid

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+uid://bbgyhmb8a17i7

core/scene_manager/scene_config.tres

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+[gd_resource type="Resource" script_class="SceneConfig" format=3 uid="uid://dr612tmciq8pg"]
+
+[ext_resource type="PackedScene" uid="uid://btcpge7cj2041" path="res://core/main_menu/main_menu.tscn" id="1_72aup"]
+[ext_resource type="Script" uid="uid://bbgyhmb8a17i7" path="res://core/scene_manager/scene_config.gd" id="1_km45g"]
+[ext_resource type="PackedScene" uid="uid://cae0mnf353dy3" path="res://docs/museums/biome_generator/museum_biome_generator.tscn" id="2_prsyo"]
+
+[resource]
+script = ExtResource("1_km45g")
+scenes = Dictionary[int, PackedScene]({
+0: ExtResource("1_72aup"),
+1: ExtResource("2_prsyo")
+})
+metadata/_custom_type_script = "uid://bbgyhmb8a17i7"

core/scene_manager/scene_manager.gd

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+extends CanvasLayer
+
+@export var config: SceneConfig
+@onready var color_rect = $ColorRect
+@onready var loading_screen = $LoadingScreen
+@export var transition_duration: float = 1
+
+func _ready() -> void:
+	color_rect.color.a = 0.0
+	color_rect.mouse_filter = Control.MOUSE_FILTER_IGNORE
+	loading_screen.hide()
+
+func change_scene(scene_enum: SceneConfig.SceneName) -> void:
+	if not config or not config.scenes.has(scene_enum):
+		return
+
+	var target_scene: PackedScene = config.scenes[scene_enum]
+
+	color_rect.mouse_filter = Control.MOUSE_FILTER_STOP
+	
+	var tween_in = create_tween()
+	tween_in.tween_property(color_rect, "color:a", 1.0, transition_duration)
+	await tween_in.finished
+
+	loading_screen.show()
+	await get_tree().process_frame 
+
+	get_tree().change_scene_to_packed(target_scene)
+
+	loading_screen.hide()
+
+	var tween_out = create_tween()
+	tween_out.tween_property(color_rect, "color:a", 0.0, transition_duration)
+	await tween_out.finished
+
+	color_rect.mouse_filter = Control.MOUSE_FILTER_IGNORE
+
+func quit_game() -> void:
+	color_rect.mouse_filter = Control.MOUSE_FILTER_STOP
+	var tween = create_tween()
+	tween.tween_property(color_rect, "color:a", 1.0, transition_duration)
+	await tween.finished
+	get_tree().quit()

core/scene_manager/scene_manager.gd.uid

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+uid://bf1f2kp8ghtei

core/scene_manager/scene_manager.tscn

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+[gd_scene format=3 uid="uid://bw8hwkw55j675"]
+
+[ext_resource type="Script" uid="uid://bf1f2kp8ghtei" path="res://core/scene_manager/scene_manager.gd" id="1_7resu"]
+[ext_resource type="Resource" uid="uid://dr612tmciq8pg" path="res://core/scene_manager/scene_config.tres" id="2_vtdwt"]
+
+[node name="SceneManager" type="CanvasLayer" unique_id=399843239]
+layer = 100
+script = ExtResource("1_7resu")
+config = ExtResource("2_vtdwt")
+
+[node name="ColorRect" type="ColorRect" parent="." unique_id=1075660170]
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+mouse_filter = 2
+color = Color(0, 0, 0, 0)
+
+[node name="LoadingScreen" type="Control" parent="." unique_id=1075176512]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+mouse_filter = 2
+
+[node name="Label" type="Label" parent="LoadingScreen" unique_id=887425331]
+layout_mode = 1
+anchors_preset = 3
+anchor_left = 1.0
+anchor_top = 1.0
+anchor_right = 1.0
+anchor_bottom = 1.0
+offset_left = -169.0
+offset_top = -65.0
+offset_right = -20.0
+offset_bottom = -20.0
+grow_horizontal = 0
+grow_vertical = 0
+theme_override_constants/outline_size = 24
+theme_override_font_sizes/font_size = 32
+text = "Loading..."