Grunk alarm!

levels/mechanic_test/mechanic_test.gd

@@ -4,12 +4,14 @@ extends Node3D
 @onready var gunk_hall: GunkBody = %GunkHall
 
 @onready var bulkhead: Node3D = $Bulkhead
-@onready var open_switch: Node3D = $Bulkhead/Podium/OpenSwitch
-@onready var close_switch: Node3D = $Bulkhead/Podium2/CloseSwitch
+@onready var open_switch: Node3D = %OpenSwitch
+@onready var close_switch: Node3D = %CloseSwitch
 
-@onready var nodule_spawn_point: Marker3D = $NoduleSpawner/NoduleSpawnPoint
+@onready var nodule_spawn_point: Marker3D = %NoduleSpawnPoint
+@onready var alarm_spawn_point: Marker3D = %AlarmSpawnPoint
 
 static var nodule_scene: PackedScene = load("res://src/world/gunk_node/grunk_nodule.tscn")
+static var alarm_scene: PackedScene = load("res://src/world/mechanics/alarm/gunk_alarm.tscn")
 
 
 func reset() -> void:
@@ -20,8 +22,22 @@ func reset() -> void:
 	Callable(close_switch, "disable").call()
 
 
-func spawn_nodule() -> void:
-	for c: Node in nodule_spawn_point.get_children():
+func _do_spawn(spawn_point: Node3D, scene: PackedScene) -> void:
+	for c: Node in spawn_point.get_children():
 		c.queue_free()
-	var instance := nodule_scene.instantiate()
-	nodule_spawn_point.add_child(instance)
+	var instance := scene.instantiate()
+	spawn_point.add_child(instance)
+
+
+func spawn_nodule() -> void:
+	_do_spawn(nodule_spawn_point, nodule_scene)
+
+
+func spawn_alarm() -> void:
+	_do_spawn(alarm_spawn_point, alarm_scene)
+
+
+func trigger_spawned_alarm() -> void:
+	var alarm: GunkAlarm = alarm_spawn_point.get_child(0)
+	if alarm:
+		alarm.trigger()

levels/mechanic_test/mechanic_test.tscn

@@ -173,17 +173,58 @@ mesh = SubResource("BoxMesh_goufh")
 [node name="CollisionShape3D" type="CollisionShape3D" parent="NoduleSpawner"]
 shape = SubResource("ConcavePolygonShape3D_bg05n")
 
-[node name="SpawnSwitch" parent="NoduleSpawner" instance=ExtResource("2_pka60")]
+[node name="WallSwitch" parent="NoduleSpawner" instance=ExtResource("2_pka60")]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.4, 0.35)
 enabled = true
 
 [node name="Label3D" type="Label3D" parent="NoduleSpawner"]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.9, 0.3)
-text = "Spawn"
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0.3)
+text = "Spawn
+Nodule"
 
 [node name="NoduleSpawnPoint" type="Marker3D" parent="NoduleSpawner"]
+unique_name_in_owner = true
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, -3)
 
+[node name="AlarmSpawner" type="StaticBody3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -4.5, 1, -6)
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="AlarmSpawner"]
+mesh = SubResource("BoxMesh_goufh")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="AlarmSpawner"]
+shape = SubResource("ConcavePolygonShape3D_bg05n")
+
+[node name="WallSwitch" parent="AlarmSpawner" instance=ExtResource("2_pka60")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.4, 0.35)
+enabled = true
+
+[node name="Label3D" type="Label3D" parent="AlarmSpawner"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0.3)
+text = "Spawn
+Alarm"
+
+[node name="AlarmSpawnPoint" type="Marker3D" parent="AlarmSpawner"]
+unique_name_in_owner = true
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -0.7, -4)
+
+[node name="AlarmTrigger" type="StaticBody3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -3.5, 1, -6)
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="AlarmTrigger"]
+mesh = SubResource("BoxMesh_goufh")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="AlarmTrigger"]
+shape = SubResource("ConcavePolygonShape3D_bg05n")
+
+[node name="AlarmTriggerSwitch" parent="AlarmTrigger" instance=ExtResource("2_pka60")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.4, 0.35)
+enabled = true
+
+[node name="Label3D" type="Label3D" parent="AlarmTrigger"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0.3)
+text = "Trigger"
+
 [node name="GunkHall" parent="." instance=ExtResource("4_2uiim")]
 unique_name_in_owner = true
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 1.5, 0, -31)
@@ -197,6 +238,7 @@ mesh = SubResource("ArrayMesh_x2vho")
 shape = SubResource("ConcavePolygonShape3D_qjnj2")
 
 [node name="Bulkhead" parent="." instance=ExtResource("8_0j1ke")]
+unique_name_in_owner = true
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -6.5, 0, -2)
 
 [node name="Podium" type="StaticBody3D" parent="Bulkhead"]
@@ -209,9 +251,14 @@ mesh = SubResource("BoxMesh_goufh")
 shape = SubResource("ConcavePolygonShape3D_bg05n")
 
 [node name="OpenSwitch" parent="Bulkhead/Podium" instance=ExtResource("2_pka60")]
+unique_name_in_owner = true
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.4, 0.35)
 enabled = true
 
+[node name="Label3D" type="Label3D" parent="Bulkhead/Podium"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.9, 0.3)
+text = "Open"
+
 [node name="Podium2" type="StaticBody3D" parent="Bulkhead"]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 3, 1, 0)
 
@@ -222,10 +269,17 @@ mesh = SubResource("BoxMesh_goufh")
 shape = SubResource("ConcavePolygonShape3D_bg05n")
 
 [node name="CloseSwitch" parent="Bulkhead/Podium2" instance=ExtResource("2_pka60")]
+unique_name_in_owner = true
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.4, 0.35)
 
+[node name="Label3D" type="Label3D" parent="Bulkhead/Podium2"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.9, 0.3)
+text = "Close"
+
 [connection signal="activated" from="ResetPodium/ResetSwitch" to="." method="reset"]
-[connection signal="activated" from="NoduleSpawner/SpawnSwitch" to="." method="spawn_nodule"]
+[connection signal="activated" from="NoduleSpawner/WallSwitch" to="." method="spawn_nodule"]
+[connection signal="activated" from="AlarmSpawner/WallSwitch" to="." method="spawn_alarm"]
+[connection signal="activated" from="AlarmTrigger/AlarmTriggerSwitch" to="." method="trigger_spawned_alarm"]
 [connection signal="activated" from="Bulkhead/Podium/OpenSwitch" to="Bulkhead" method="open"]
 [connection signal="activated" from="Bulkhead/Podium/OpenSwitch" to="Bulkhead/Podium/OpenSwitch" method="disable"]
 [connection signal="activated" from="Bulkhead/Podium/OpenSwitch" to="Bulkhead/Podium2/CloseSwitch" method="enable"]

src/game/game_manager.gd

@@ -1,13 +1,37 @@
 class_name GameManagerType extends Node
 ## Autoloaded singleton encapsulating game state.
 
+## Emitted just after `delta` is added to the player's grunk tank.
 signal grunk_collected(delta: float)
 
+## Emitted just before the alert level is raised to `new_value`.
+signal alert_raised(new_value: int)
+
+## Emitted just before the alert level is reset to zero.
+signal alert_cleared
+
+const MAX_ALERT := 6
+
 var grunk_tank := 0.0
 
 var alert_level := 0
 
 
+## Add to the player's grunk tank.
 func collect_grunk(delta: float) -> void:
 	grunk_tank += delta
 	grunk_collected.emit(delta)
+
+
+## Raise the alert level, if possible.
+func raise_alert(delta: int) -> void:
+	var new_value := clampi(alert_level + delta, 0, MAX_ALERT)
+	if new_value != alert_level:
+		alert_raised.emit(new_value)
+	alert_level = new_value
+
+
+## Reset the alert level to zero.
+func clear_alert() -> void:
+	alert_cleared.emit()
+	alert_level = 0

src/world/mechanics/alarm/gunk_alarm.gd

@@ -0,0 +1,36 @@
+class_name GunkAlarm extends GunkNode
+## Raises the grunk alert when triggered.
+
+## Emitted when this alarm is triggered, just after the alert level is raised.
+signal triggered
+
+const ALERT_DELTA := 1
+
+var _busy := false
+
+@onready var mesh_instance_3d: MeshInstance3D = %MeshInstance3D
+@onready var animation_player: AnimationPlayer = %AnimationPlayer
+
+
+## Trigger this alarm.
+##
+## Will not trigger if this alarm is busy (e.g. on cooldown)
+func trigger() -> void:
+	if not _busy:
+		Game.manager.raise_alert(ALERT_DELTA)
+		_busy = true
+		animation_player.play("trigger")
+		triggered.emit()
+
+
+func _process(delta: float) -> void:
+	super._process(delta)
+	# TODO actual model & animation
+	var material: StandardMaterial3D = mesh_instance_3d.mesh.surface_get_material(0)
+	var value := 1.0 - _sustained_damage / durability
+	material.albedo_color = Color(value, value, value)
+
+
+func _on_animation_finished(anim_name: StringName) -> void:
+	if anim_name == "trigger":
+		_busy = false

src/world/mechanics/alarm/gunk_alarm.gd.uid

@@ -0,0 +1 @@
+uid://djb5tabjcvwkt

src/world/mechanics/alarm/gunk_alarm.tscn

@@ -0,0 +1,85 @@
+[gd_scene load_steps=8 format=3 uid="uid://dgeg3kkogm71m"]
+
+[ext_resource type="Script" uid="uid://djb5tabjcvwkt" path="res://src/world/mechanics/alarm/gunk_alarm.gd" id="1_piaxx"]
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_piaxx"]
+resource_local_to_scene = true
+emission_enabled = true
+emission = Color(1, 0, 0, 1)
+emission_energy_multiplier = 0.0
+
+[sub_resource type="CylinderMesh" id="CylinderMesh_1uge1"]
+resource_local_to_scene = true
+material = SubResource("StandardMaterial3D_piaxx")
+top_radius = 0.3
+bottom_radius = 0.3
+height = 0.3
+
+[sub_resource type="CylinderShape3D" id="CylinderShape3D_b4qsp"]
+height = 0.3
+radius = 0.3
+
+[sub_resource type="Animation" id="Animation_piaxx"]
+resource_name = "trigger"
+length = 4.0
+step = 0.1
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("MeshInstance3D:mesh:material:emission_energy_multiplier")
+tracks/0/interp = 2
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4),
+"transitions": PackedFloat32Array(1, 1, 1, 1, 1, 1, 1, 1, 1),
+"update": 0,
+"values": [0.0, 4.0, 0.0, 4.0, 0.0, 4.0, 0.0, 4.0, 0.0]
+}
+
+[sub_resource type="Animation" id="Animation_b6er8"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("MeshInstance3D:mesh:material:emission_energy_multiplier")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [0.0]
+}
+
+[sub_resource type="AnimationLibrary" id="AnimationLibrary_b6er8"]
+_data = {
+&"RESET": SubResource("Animation_b6er8"),
+&"trigger": SubResource("Animation_piaxx")
+}
+
+[node name="GunkAlarm" type="StaticBody3D"]
+collision_layer = 5
+collision_mask = 0
+script = ExtResource("1_piaxx")
+durability = 3.0
+value = 10000.0
+metadata/_custom_type_script = "uid://bypgxi0gy56yk"
+
+[node name="Label3D" type="Label3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, -4.37114e-08, 1, 0, -1, -4.37114e-08, 0, 0.2, 0)
+text = "ALARM"
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="."]
+unique_name_in_owner = true
+mesh = SubResource("CylinderMesh_1uge1")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
+shape = SubResource("CylinderShape3D_b4qsp")
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
+unique_name_in_owner = true
+libraries = {
+&"": SubResource("AnimationLibrary_b6er8")
+}
+
+[connection signal="animation_finished" from="AnimationPlayer" to="." method="_on_animation_finished"]