feat: derive resource visuals from state

world/jajce/StylizedBerryPatch.gd

@@ -1,5 +1,5 @@
 class_name StylizedBerryPatch
-extends Node3D
+extends ResourceAmountVisual
 
 const WIND_SHADER := preload("res://world/jajce/materials/wind.gdshader")
 const LEAF_POSITIONS := [
@@ -31,12 +31,37 @@ const BERRY_POSITIONS := [
 func _ready() -> void:
 	_build_leaves()
 	_build_berries()
+	super()
 
 
 func get_presentation_instance_count() -> int:
 	return LEAF_POSITIONS.size() + BERRY_POSITIONS.size()
 
 
+func get_visible_leaf_count() -> int:
+	return $Leaves.multimesh.visible_instance_count
+
+
+func get_visible_berry_count() -> int:
+	return $Berries.multimesh.visible_instance_count
+
+
+func _apply_resource_amount_visual(
+	_amount_remaining: float, remaining_ratio: float, tier: AmountTier
+) -> void:
+	var visible_leaves := LEAF_POSITIONS.size()
+	if tier == AmountTier.LOW:
+		visible_leaves = 3
+	elif tier == AmountTier.DEPLETED:
+		visible_leaves = 2
+	$Leaves.multimesh.visible_instance_count = visible_leaves
+
+	var visible_berries := ceili(remaining_ratio * BERRY_POSITIONS.size())
+	if tier == AmountTier.DEPLETED:
+		visible_berries = 0
+	$Berries.multimesh.visible_instance_count = visible_berries
+
+
 func _build_leaves() -> void:
 	var mesh := SphereMesh.new()
 	mesh.radius = 1.0