Implemented threaded generation for mat_maker_gd using ThreadPool.

game/addons/mat_maker_gd/nodes/mm_material.gd

@@ -2,10 +2,17 @@ tool
 class_name MMMateial
 extends Resource
 
+#threads are implemented using my thread pool engine module.
+#if you want to use this without that module in your engine set this to false,
+#and comment out the lines that give errors
+const USE_THREADS = true
+
 export(Vector2) var image_size : Vector2 = Vector2(128, 128)
 export(Array) var nodes : Array
 
 var initialized : bool = false
+var rendering : bool = false
+var queued_render : bool = false
 
 func initialize():
 	if !initialized:
@@ -39,6 +46,12 @@ func remove_node(node : MMNode) -> void:
 	emit_changed()
 
 func render() -> void:
+	if USE_THREADS:
+		render_threaded()
+	else:
+		render_non_threaded()
+	
+func render_non_threaded() -> void:
 	if !initialized:
 		initialize()
 		
@@ -51,5 +64,36 @@ func render() -> void:
 			if n && n.render(self):
 				did_render = true
 
+func render_threaded() -> void:
+	if rendering:
+		queued_render = true
+		return
+		
+	if !initialized:
+		initialize()
+	
+	var j : ThreadPoolExecuteJob = ThreadPoolExecuteJob.new()
+	j.setup(self, "_thread_func")
+	
+	ThreadPool.add_job(j)
+
+func _thread_func() -> void:
+	rendering = true
+	
+	var did_render : bool = true
+		
+	while did_render:
+		did_render = false
+		
+		for n in nodes:
+			if n && n.render(self):
+				did_render = true
+				
+	rendering = false
+	
+	if queued_render:
+		queued_render = false
+		_thread_func()
+
 func on_node_changed() -> void:
 	call_deferred("render")