stacking pickup

data/coin_flower.tres

@@ -8,5 +8,5 @@ script = ExtResource("3_fe16f")
 icon = ExtResource("1_vrj0d")
 name = "Coin Flower"
 id = &"coin_flower"
-stackable = false
+stackable = true
 stack_limit = 8

src/ingame/player.gd

@@ -59,13 +59,17 @@ func _physics_process(delta: float) -> void:
 	## Process interactivity selection.
 	if id == multiplayer.get_unique_id():
 		var collider: Object = null
-		if empty_handed() and _line_of_sight.is_colliding():
-			collider = _line_of_sight.get_collider(0)
+		if _line_of_sight.is_colliding():
+			var possible_collider = _line_of_sight.get_collider(0)
+			if empty_handed(): collider = possible_collider
+			elif possible_collider and \
+					GameState.are_bundles_stackable(held_thing, possible_collider.owner.item_bundle):
+				collider = possible_collider
 		if collider != _interaction_selection:
 			if _interaction_selection != null:
 				_interaction_selection.get_parent().mark_non_interactive()
 			if collider != null:
-				collider.get_parent().mark_interactive()
+				collider.owner.mark_interactive()
 		_interaction_selection = collider
 
 	# Add the gravity.
@@ -114,7 +118,7 @@ func hold_thing(p_bundle: Dictionary) -> void:
 		base_node.add_child(model)
 	else:
 		# Create a icon sprite based one instead.
-		var model := preload("res://src/quad_viewmodel.tscn").instantiate()
+		var model := preload("res://src/ingame/quad_viewmodel.tscn").instantiate()
 		model.reflect_bundle(p_bundle)
 		base_node.add_child(model)
 
@@ -151,10 +155,15 @@ func _unhandled_input(event: InputEvent) -> void:
 		_camera_pivot.rotation.x = clamp(_camera_pivot.rotation.x, -1.2, 1.2)
 		return
 	
-	if event.is_action_pressed("pick") and empty_handed():
+	if event.is_action_pressed("pick"):
 		if _interaction_selection != null:
+			if empty_handed():
 				_interaction_selection.owner.get_picked_up.rpc()
 				hold_thing.rpc(_interaction_selection.owner.item_bundle)
+			elif GameState.are_bundles_stackable(held_thing, _interaction_selection.owner.item_bundle):
+				_interaction_selection.owner.get_picked_up.rpc()
+				var bundle := GameState.combine_bundles(held_thing, _interaction_selection.owner.item_bundle)
+				hold_thing.rpc(bundle)
 	
 	if event.is_action_pressed("fire") and not empty_handed():
 		var new_projectile: Node3D = _projectile_scene.instantiate()

src/lib/game_state.gd

@@ -23,3 +23,18 @@ static func save() -> void:
 
 static func fetch() -> GameState:
 	return _instance
+
+
+# TODO: better place for those?
+static func are_bundles_stackable(p_a_bundle: Dictionary, p_b_bundle: Dictionary) -> bool:
+	var item = GameState.fetch().INVENTORY_ITEM_DB[p_a_bundle["item_id"]]
+	return p_a_bundle["item_id"] == p_b_bundle["item_id"] and \
+		item.stackable and p_a_bundle["count"] + p_b_bundle["count"] <= item.stack_limit
+
+
+static func combine_bundles(p_a_bundle: Dictionary, p_b_bundle: Dictionary) -> Dictionary:
+	assert(are_bundles_stackable(p_a_bundle, p_b_bundle))
+	return {
+		"item_id": p_a_bundle["item_id"],
+		"count": p_a_bundle["count"] + p_b_bundle["count"],
+	}

src/lib/inventory_item.gd

@@ -1,5 +1,4 @@
-class_name InventoryItem
-extends Resource
+class_name InventoryItem extends Resource
 
 @export var icon: Texture2D = preload("res://icon.svg")
 @export var model: PackedScene

src/quad_viewmodel.gd

@@ -1,5 +0,0 @@
-extends Node3D
-
-func reflect_bundle(p_bundle: Dictionary) -> void:
-	$Sprite3D.texture = GameState.fetch().INVENTORY_ITEM_DB[p_bundle["item_id"]].icon
-	$CountLabel.text = str(p_bundle["count"])

src/quad_viewmodel.tscn

@@ -1,19 +0,0 @@
-[gd_scene load_steps=3 format=3 uid="uid://dxb5f3il2h1ur"]
-
-[ext_resource type="Script" path="res://src/quad_viewmodel.gd" id="1_vidqb"]
-[ext_resource type="Texture2D" uid="uid://dw3x3h3f34sy3" path="res://assets/coin_flower.png" id="2_3hbqi"]
-
-[node name="QuadViewmodel" type="Node3D"]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.179242, 0)
-script = ExtResource("1_vidqb")
-
-[node name="CountLabel" type="Label3D" parent="."]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.181474, 0)
-billboard = 1
-text = "3"
-
-[node name="Sprite3D" type="Sprite3D" parent="."]
-pixel_size = 0.015
-billboard = 1
-texture_filter = 0
-texture = ExtResource("2_3hbqi")