Reduced gunk mask resolution

levels/sandbox/sandbox.tscn

@@ -180,7 +180,7 @@ shape = SubResource("ConcavePolygonShape3D_hvf6a")
 
 [node name="Cube" parent="Geometry" instance=ExtResource("1_a67lu")]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 8, 4, 0)
-mask_dim = 4096
+mask_dim = 1024
 
 [node name="MeshInstance3D" type="MeshInstance3D" parent="Geometry/Cube"]
 mesh = ExtResource("6_4kku3")
@@ -191,7 +191,7 @@ shape = SubResource("ConcavePolygonShape3D_0qjrr")
 
 [node name="Cylinder" parent="Geometry" instance=ExtResource("1_a67lu")]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 1.33738, 6, -7.18125)
-mask_dim = 4096
+mask_dim = 1024
 
 [node name="MeshInstance3D" type="MeshInstance3D" parent="Geometry/Cylinder"]
 mesh = ExtResource("7_gn6k6")

src/equipment/point_spray/point_spray.gd

@@ -1,7 +1,7 @@
 class_name PointSpray extends Spray
 ## Simple single-point spraygun
 
-@export var spray_scale := 16.0
+@export var spray_scale := 3.0
 
 @onready var raycast: RayCast3D = %RayCast3D
 @onready var spray_effect: MeshInstance3D = %SprayEffect

src/equipment/wide_spray/wide_spray.gd

@@ -3,7 +3,7 @@ class_name WideSpray extends Spray
 
 const SPRAYCAST_GROUP := "SprayCast"
 
-@export var spray_scale := 16.0
+@export var spray_scale := 3.0
 
 @onready var spray_casts: Node3D = %SprayCasts
 @onready var spray_effect: MeshInstance3D = %SprayEffect

src/player/player.tscn

@@ -2,7 +2,7 @@
 
 [ext_resource type="Script" path="res://src/player/player.gd" id="1_npueo"]
 [ext_resource type="Script" path="res://src/player/camera_controller.gd" id="2_veeqv"]
-[ext_resource type="PackedScene" uid="uid://cc102xko0u6yj" path="res://src/equipment/point_spray/point_spray.tscn" id="3_8n2h0"]
+[ext_resource type="PackedScene" uid="uid://d2hnxr5l6w2x4" path="res://src/equipment/wide_spray/wide_spray.tscn" id="3_ibq07"]
 
 [sub_resource type="BoxMesh" id="BoxMesh_ua7a2"]
 size = Vector3(0.05, 0.05, 0.3)
@@ -30,7 +30,7 @@ mesh = SubResource("BoxMesh_ua7a2")
 unique_name_in_owner = true
 transform = Transform3D(1, 0, 0, 0, 0.997564, -0.0697565, 0, 0.0697565, 0.997564, 0, 0, -0.15)
 
-[node name="PointSpray" parent="CameraPivot/SprayNozzle/SprayMuzzle" instance=ExtResource("3_8n2h0")]
+[node name="WideSpray" parent="CameraPivot/SprayNozzle/SprayMuzzle" instance=ExtResource("3_ibq07")]
 
 [node name="Camera3D" type="Camera3D" parent="CameraPivot"]
 current = true

src/world/gunk_body/draw_controller.gd

@@ -1,8 +1,11 @@
 class_name DrawController extends Control
 
+## Emitted the frame after at least one paint operation was done.
+signal painted
+
 var _draw_queue: Array[Callable] = []
 
-var _dirty := true
+var _dirty := false
 
 
 func queue_draw(op: Callable) -> void:
@@ -20,3 +23,4 @@ func _process(_delta: float) -> void:
 	if _dirty:
 		queue_redraw()
 		_dirty = false
+		painted.emit()

src/world/gunk_body/gunk_body.gd

@@ -6,7 +6,7 @@ const BUFFER_LIMIT := 3
 const FACE_EPSILON := 0.4
 const MASK_COLOR := Color.RED
 
-@export var mask_dim := 1024
+@export var mask_dim := 256
 
 var meshtool := MeshDataTool.new()
 
@@ -16,6 +16,9 @@ var _continued_paint_this_frame := false
 var _multiline_buffer := PackedVector2Array()
 var _multiline_width := 1.0
 
+var _clear_total := 0.0
+var _clear_total_dirty := true
+
 @onready var mesh_instance: MeshInstance3D = $MeshInstance3D
 @onready var mesh: ArrayMesh = mesh_instance.mesh
 @onready var gunk_mat: ShaderMaterial = mesh_instance.get_surface_override_material(0).next_pass
@@ -30,6 +33,23 @@ func _ready() -> void:
 	meshtool.create_from_surface(mesh, 0)
 
 
+## Get the precise number of gunk pixels cleared from this image.
+##
+## This will use a cached result unless the mask has been painted since the last calculation.
+## Be aware that cache misses are potentially quite expensive.
+func get_clear_total() -> float:
+	if _clear_total_dirty:
+		var mask_img := mask_viewport.get_texture().get_image()
+		mask_img.convert(Image.FORMAT_R8)
+		var px_data := mask_img.get_data()
+		var px_sum := 0
+		for px in px_data:
+			px_sum += px
+		_clear_total = px_sum / 255.0
+		_clear_total_dirty = false
+	return _clear_total
+
+
 ## Transform cartesian coordinates to barycentric wrt the given triangle.
 func _barycentric(p: Vector3, a: Vector3, b: Vector3, c: Vector3) -> Vector3:
 	var v0 := b - a
@@ -156,3 +176,7 @@ func _process(_delta: float) -> void:
 			func() -> void: mask_control.draw_multiline(points, MASK_COLOR, width, true)
 		)
 		_multiline_buffer = PackedVector2Array()
+
+
+func _on_mask_painted() -> void:
+	_clear_total_dirty = true

src/world/gunk_body/gunk_body.tscn

@@ -25,3 +25,5 @@ anchor_bottom = 1.0
 grow_horizontal = 2
 grow_vertical = 2
 script = ExtResource("2_kkcjw")
+
+[connection signal="painted" from="MaskViewport/MaskControl" to="." method="_on_mask_painted"]