initial prize packs code

engine/prizepack.gd

@@ -0,0 +1,25 @@
+extends Node
+
+var index : int = 0
+var pool : Array = []
+var rng : RandomNumberGenerator = RandomNumberGenerator.new()
+var chance : float = 0.5
+
+func _ready():
+	rng.randomize()
+
+func _init(items : Array, threshold : float):
+	pool = items
+	chance = threshold
+
+# returns the loot drop item for the current kill count in the prize pack
+# keeps track of which item to drop and only provides an item if a random
+# value matches the chance to drop an item
+func get_drop() -> String:
+	var drop = ""
+	if rng.randf() <= chance:
+		drop = pool[index % pool.size()]
+	index += 1
+	if index > pool.size() * 100:
+		index = 0
+	return drop

engine/prizepacks.gd

@@ -0,0 +1,43 @@
+extends Node
+class_name prizepacks
+
+# will hold an array of prizepack objects
+var packs : Array = []
+
+# will remap prizepack indexes, usefull for randomized games
+var remapped : Array = []
+
+func _init():
+	# default prize pack definitions, array of items to drop and the chance to drop
+	var packdefs : Array = [
+		{"pool": [""], "chance": 1.0},
+		{"pool": ["smallheart","whitetetran"], "chance": 0.5},
+		{"pool": ["whitetetran","whitetetran","smallheart","redtetran"], "chance" : 0.5},
+		{"pool": ["smallheart","redtetran","smallheart","bluetetran"], "chance": 0.5},
+		{"pool": ["whitetetran","redtetran","bluetetran","greentetran"], "chance": 0.5}
+	]
+	var pp = load("res://engine/prizepack.gd")
+	for p in packdefs:
+		packs.append(pp.new(packdefs[p].pool, packdefs[p].chance))
+
+func remap():
+	if packs.size() > 0:
+		for i in range(packs.size()):
+			remapped[i] = i
+	else:
+		remapped = []
+
+func set_map(map : Array):
+	if map.size() > packs.size():
+		remap()
+	else:
+		remapped = map
+
+func _ready():
+	remap()
+
+# each enemy should have a prizepack property (integer) to pass to this function on kill
+func get_drop_from_pack(pack : int) -> String:
+	if pack >= packs.size():
+		return ""
+	return packs[remapped[pack]].get_drop()

project.godot

@@ -28,12 +28,18 @@ _global_script_classes=[ {
 "class": "Player",
 "language": "GDScript",
 "path": "res://player/player.gd"
+}, {
+"base": "Node",
+"class": "prizepacks",
+"language": "GDScript",
+"path": "res://engine/prizepacks.gd"
 } ]
 _global_script_class_icons={
 "Enemy": "",
 "Entity": "",
 "Item": "",
-"Player": ""
+"Player": "",
+"prizepacks": ""
 }
 
 [application]