updated the start scene to perform background loading

start.gd

@@ -1,10 +1,27 @@
 extends Control
 
-func _ready():
+var loader
-	call_deferred("change_scene")
 
-func change_scene():
+func _ready():
+	var path : String
 	if Directory.new().file_exists("res://material_maker/main_window.tscn"):
-		get_tree().change_scene("res://material_maker/main_window.tscn")
+		path = "res://material_maker/main_window.tscn"
 	else:
-		get_tree().change_scene("res://demo/demo.tscn")
+		path = "res://demo/demo.tscn"
+	loader = ResourceLoader.load_interactive(path)
+	if loader == null: # check for errors
+		print("error")
+		queue_free()
+
+func _process(delta):
+	var err = loader.poll()
+	if err == ERR_FILE_EOF:
+		var resource = loader.get_resource()
+		get_node("/root").add_child(resource.instance())
+		queue_free()
+	elif err == OK:
+		var progress = float(loader.get_stage()) / loader.get_stage_count()
+		$VBoxContainer/ProgressBar.value = 100.0*progress
+	else: # error during loading
+		print("error")
+		queue_free()

start.tscn

@@ -1,11 +1,39 @@
-[gd_scene load_steps=2 format=2]
+[gd_scene load_steps=3 format=2]
 
 [ext_resource path="res://start.gd" type="Script" id=1]
+[ext_resource path="res://rodz_labs_logo.png" type="Texture" id=2]
 
-[node name="Start" type="Control"]
+[node name="Start" type="Panel"]
 anchor_right = 1.0
 anchor_bottom = 1.0
 script = ExtResource( 1 )
+
+[node name="VBoxContainer" type="VBoxContainer" parent="."]
+anchor_left = 0.5
+anchor_right = 0.5
+anchor_bottom = 1.0
+margin_left = -128.0
+margin_right = 128.0
+alignment = 1
 __meta__ = {
 "_edit_use_anchors_": false
 }
+
+[node name="TextureRect" type="TextureRect" parent="VBoxContainer"]
+margin_top = 214.0
+margin_right = 256.0
+margin_bottom = 470.0
+texture = ExtResource( 2 )
+stretch_mode = 4
+
+[node name="Label" type="Label" parent="VBoxContainer"]
+margin_top = 474.0
+margin_right = 256.0
+margin_bottom = 488.0
+text = "Loading..."
+align = 1
+
+[node name="ProgressBar" type="ProgressBar" parent="VBoxContainer"]
+margin_top = 492.0
+margin_right = 256.0
+margin_bottom = 506.0