Preoared random seed lock button

addons/material_maker/engine/gen_base.gd

@@ -49,6 +49,9 @@ func toggle_editable() -> bool:
 func is_editable() -> bool:
 	return false
 
+func has_randomness():
+	return false
+
 func init_parameters() -> void:
 	for p in get_parameter_defs():
 		if !parameters.has(p.name):

addons/material_maker/icons/icons.svg

@@ -15,7 +15,7 @@
    viewBox="0 0 128 64"
    version="1.1"
    id="svg8"
-   inkscape:version="0.92.3 (2405546, 2018-03-11)"
+   inkscape:version="0.92.4 (5da689c313, 2019-01-14)"
    sodipodi:docname="icons.svg">
   <defs
      id="defs2">
@@ -48,9 +48,9 @@
      borderopacity="1.0"
      inkscape:pageopacity="0.0"
      inkscape:pageshadow="2"
-     inkscape:zoom="14.304427"
+     inkscape:zoom="28.608854"
-     inkscape:cx="79.150133"
+     inkscape:cx="86.841515"
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+     inkscape:cy="21.061007"
      inkscape:document-units="px"
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      showgrid="true"
@@ -393,5 +393,62 @@
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        sodipodi:nodetypes="czsc" />
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 </svg>

addons/material_maker/icons/randomness_locked.tres

@@ -0,0 +1,8 @@
+[gd_resource type="AtlasTexture" load_steps=2 format=2]
+
+[ext_resource path="res://addons/material_maker/icons/icons.svg" type="Texture" id=1]
+
+[resource]
+flags = 4
+atlas = ExtResource( 1 )
+region = Rect2( 80, 32, 16, 16 )

addons/material_maker/icons/randomness_unlocked.tres

@@ -0,0 +1,8 @@
+[gd_resource type="AtlasTexture" load_steps=2 format=2]
+
+[ext_resource path="res://addons/material_maker/icons/icons.svg" type="Texture" id=1]
+
+[resource]
+flags = 4
+atlas = ExtResource( 1 )
+region = Rect2( 64, 32, 16, 16 )

addons/material_maker/nodes/base.gd

@@ -3,12 +3,23 @@ extends GraphNode
 class_name MMGraphNodeBase
 
 var generator : MMGenBase = null setget set_generator
+var fixed_seed = false
 
 func _ready() -> void:
 	connect("offset_changed", self, "_on_offset_changed")
 
+func _draw():
+	if generator.has_randomness():
+		var icon = preload("res://addons/material_maker/icons/randomness_unlocked.tres") if fixed_seed else preload("res://addons/material_maker/icons/randomness_locked.tres")
+		draw_texture_rect(icon, Rect2(rect_size.x-48, 4, 16, 16), false)
+
 func set_generator(g) -> void:
 	generator = g
 
 func _on_offset_changed() -> void:
 	generator.set_position(offset)
+
+func _on_gui_input(event):
+	if event is InputEventMouseButton and event.pressed and event.button_index == BUTTON_LEFT and Rect2(rect_size.x-48, 4, 16, 16).has_point(event.position):
+		fixed_seed = !fixed_seed
+		update()