Added optional preview to reroute node.

addons/material_maker/engine/nodes/gen_base.gd

@@ -319,7 +319,10 @@ func get_output_defs(_show_hidden : bool = false) -> Array:
 	return []
 
 func get_source(input_index : int) -> OutputPort:
-	return get_parent().get_port_source(name, input_index)
+	var parent : MMGenGraph = get_parent()
+	if parent == null:
+		return null
+	return parent.get_port_source(name, input_index)
 
 func get_targets(output_index : int) -> Array:
 	var parent = get_parent()

addons/material_maker/engine/nodes/gen_reroute.gd

@@ -20,7 +20,7 @@ func get_output_defs(_show_hidden : bool = false) -> Array:
 	return [ { type=port_type } ]
 
 func get_parameter_defs() -> Array:
-	return []
+	return [{ name="preview", type="enum", values=["none", "small", "large", "huge"], default=0 }]
 
 func _get_shader_code(uv : String, output_index : int, context : MMGenContext) -> ShaderCode:
 	var source = get_source(0)

material_maker/nodes/reroute/reroute.gd

@@ -1,12 +1,28 @@
 extends MMGraphNodeMinimal
 
+
+const PREVIEW_SIZES : Array[int] = [ 0, 64, 128, 192]
+
+
 func _ready() -> void:
 	super._ready()
-	var current_theme : Theme = mm_globals.main_window.theme
-	for stylebox in current_theme.get_stylebox_list("Reroute"):
-		add_theme_stylebox_override(stylebox, current_theme.get_stylebox(stylebox, "Reroute"))
+	close_button.visible = false
+	set_theme_type("Reroute")
 	call_deferred("on_connections_changed")
 
+func set_generator(g : MMGenBase) -> void:
+	super.set_generator(g)
+	generator.parameter_changed.connect(self.on_parameter_changed)
+	await set_preview(g.get_parameter("preview"))
+	update_node()
+
+func set_theme_type(type : StringName):
+	var current_theme : Theme = mm_globals.main_window.theme
+	for constant in current_theme.get_constant_list(type):
+		add_theme_constant_override(constant, current_theme.get_constant(constant, type))
+	for stylebox in current_theme.get_stylebox_list(type):
+		add_theme_stylebox_override(stylebox, current_theme.get_stylebox(stylebox, type))
+
 func on_connections_changed():
 	var graph_edit = get_parent()
 	var color : Color = Color(1.0, 1.0, 1.0)
@@ -26,3 +42,65 @@ func on_connections_changed():
 			port_type = node.generator.get_input_defs()[c.from_port].type
 	set_slot(0, true, type, color, true, type, color)
 	generator.set_port_type(port_type)
+	update_preview()
+
+func update_preview(preview : Control = null):
+	if preview == null:
+		if $Contents.get_child_count() == 0:
+			return
+		preview = $Contents.get_child(0)
+	var preview_source : MMGenBase.OutputPort = generator.get_source(0)
+	if preview_source == null:
+		preview.set_generator(null)
+	else:
+		preview.set_generator(preview_source.generator, preview_source.output_index)
+
+func _on_gui_input(event):
+	if event is InputEventMouseButton and event.pressed and event.button_index == MOUSE_BUTTON_RIGHT:
+		accept_event()
+		var menu : PopupMenu = PopupMenu.new()
+		menu.add_item("No preview")
+		menu.add_item("Small preview")
+		menu.add_item("Large preview")
+		menu.add_item("Huge preview")
+		add_child(menu)
+		menu.id_pressed.connect(self.on_context_menu)
+		menu.popup(Rect2(get_global_mouse_position(), Vector2(0, 0)))
+
+func on_context_menu(id : int):
+	var old_value = generator.get_parameter("preview")
+	if old_value != id and get_parent().get("undoredo") != null:
+		var node_hier_name = generator.get_hier_name()
+		var undo_command = { type="setparams", node=node_hier_name, params={ preview=old_value } }
+		var redo_command = { type="setparams", node=node_hier_name, params={ preview=id } }
+		get_parent().undoredo.add("Set parameter value", [ undo_command ], [ redo_command ])
+	generator.set_parameter("preview", id)
+
+func on_parameter_changed(n : String, v):
+	if n == "preview":
+		var old_size : Vector2 = size
+		await set_preview(v)
+		disable_undoredo_for_offset = true
+		position_offset -= (size-old_size)/2
+		disable_undoredo_for_offset = false
+
+func set_preview(v : int):
+	var preview : Control = null
+	if $Contents.get_child_count() > 0:
+		preview = $Contents.get_child(0)
+	if v == 0:
+		if preview:
+			preview.queue_free()
+		set_theme_type("Reroute")
+	else:
+		if ! preview:
+			preview = preload("res://material_maker/panels/preview_2d/preview_2d_node.tscn").instantiate()
+			$Contents.add_child(preview)
+			preview.mouse_filter = Control.MOUSE_FILTER_IGNORE
+			update_preview(preview)
+		var preview_size : int = PREVIEW_SIZES[v]
+		preview.custom_minimum_size = Vector2(preview_size, preview_size)
+		set_theme_type("ReroutePreview")
+	await get_tree().process_frame
+	size = Vector2(0, 0)
+

material_maker/nodes/reroute/reroute.tscn

@@ -39,7 +39,8 @@ GraphNode/styles/frame = SubResource("1")
 GraphNode/styles/position = null
 GraphNode/styles/selected_frame = SubResource("2")
 
-[node name="reroute" type="GraphNode"]
+[node name="Reroute" type="GraphNode"]
+clip_children = 2
 custom_minimum_size = Vector2(24, 24)
 offset_right = 24.0
 offset_bottom = 24.0
@@ -55,7 +56,13 @@ slot/0/right_icon = null
 slot/0/draw_stylebox = true
 script = ExtResource("1")
 
-[node name="Foo" type="Control" parent="."]
+[node name="Contents" type="MarginContainer" parent="."]
 custom_minimum_size = Vector2(24, 24)
 layout_mode = 2
 mouse_filter = 2
+theme_override_constants/margin_left = 1
+theme_override_constants/margin_top = 1
+theme_override_constants/margin_right = 1
+theme_override_constants/margin_bottom = 1
+
+[connection signal="gui_input" from="." to="." method="_on_gui_input"]