Added a simple shape generator

Can be used to create a circle, a polygon or a curved star

addons/material_maker/common.shader

@@ -13,6 +13,26 @@ vec3 rand3(vec2 x) {
                           dot(x, vec2(13.254, 5.867)))) * 43758.5453);
 }
 
+float circle(vec2 uv, float sides, float radius, float edge) {
+    uv = 2.0*uv-1.0;
+    float distance = length(uv);
+    return clamp(1.0-distance/(edge*radius), 0.0, 1.0);
+}
+
+float polygon(vec2 uv, float sides, float radius, float edge) {
+    uv = 2.0*uv-1.0;
+    float angle = atan(uv.x, uv.y)+3.14159265359;
+    float slice = 6.28318530718/sides;
+    return clamp((radius-cos(floor(0.5+angle/slice)*slice-angle)*length(uv))/(edge*radius), 0.0, 1.0);
+}
+
+float star(vec2 uv, float sides, float radius, float edge) {
+    uv = 2.0*uv-1.0;
+    float angle = 2.0*(atan(uv.x, uv.y)+3.14159265359);
+    float slice = 6.28318530718/sides;
+    return clamp((radius-cos(floor(0.5+0.5*angle/slice)*2.0*slice-angle)*length(uv))/(edge*radius), 0.0, 1.0);
+}
+
 float wave_constant(float x) {
 	return 1.0;
 }

addons/material_maker/library/base.json

@@ -15,6 +15,10 @@
 		"tree_item":"Generators/Uniform",
 		"type":"uniform"
 	},
+	{
+		"tree_item":"Generators/Shape",
+		"type":"shape"
+	},
 	{
 		"tree_item":"Generators/Image",
 		"type":"image",

addons/material_maker/nodes/shape.gd

@@ -0,0 +1,17 @@
+tool
+extends "res://addons/material_maker/node_base.gd"
+
+var shape
+var sides
+var radius
+var edge
+
+const SHAPES = [ "circle", "polygon", "star" ]
+
+func _ready():
+	initialize_properties([ $shape, $sides, $radius, $edge ])
+
+func _get_shader_code(uv):
+	var rv = { defs="", code="" }
+	rv.f = "%s(%s, %d, %f, %f)" % [ SHAPES[shape], uv, sides, radius, edge ]
+	return rv

addons/material_maker/nodes/shape.tscn

@@ -0,0 +1,179 @@
+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://addons/material_maker/nodes/shape.gd" type="Script" id=1]
+
+[sub_resource type="Theme" id=1]
+
+
+[node name="Shape" type="GraphNode" index="0"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_left = 1.0
+margin_top = 4.0
+margin_right = 98.0
+margin_bottom = 53.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+mouse_filter = 1
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 1
+size_flags_vertical = 1
+theme = SubResource( 1 )
+title = "Shape"
+offset = Vector2( 0, 0 )
+show_close = true
+resizable = false
+selected = false
+comment = false
+overlay = 0
+slot/0/left_enabled = false
+slot/0/left_type = 0
+slot/0/left_color = Color( 0.5, 0.5, 1, 1 )
+slot/0/right_enabled = true
+slot/0/right_type = 0
+slot/0/right_color = Color( 0.5, 0.5, 1, 1 )
+slot/1/left_enabled = false
+slot/1/left_type = 0
+slot/1/left_color = Color( 1, 1, 1, 1 )
+slot/1/right_enabled = false
+slot/1/right_type = 0
+slot/1/right_color = Color( 1, 1, 1, 1 )
+slot/2/left_enabled = false
+slot/2/left_type = 0
+slot/2/left_color = Color( 1, 1, 1, 1 )
+slot/2/right_enabled = false
+slot/2/right_type = 0
+slot/2/right_color = Color( 1, 1, 1, 1 )
+slot/3/left_enabled = false
+slot/3/left_type = 0
+slot/3/left_color = Color( 1, 1, 1, 1 )
+slot/3/right_enabled = false
+slot/3/right_type = 0
+slot/3/right_color = Color( 1, 1, 1, 1 )
+script = ExtResource( 1 )
+_sections_unfolded = [ "Theme", "slot", "slot/0" ]
+
+[node name="shape" type="OptionButton" parent="." index="0"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_left = 16.0
+margin_top = 24.0
+margin_right = 91.0
+margin_bottom = 44.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+focus_mode = 2
+mouse_filter = 0
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 1
+size_flags_vertical = 1
+toggle_mode = false
+action_mode = 0
+enabled_focus_mode = 2
+shortcut = null
+group = null
+text = "Circle"
+flat = false
+align = 0
+items = [ "Circle", null, false, 0, null, "Polygon", null, false, 1, null, "Star", null, false, -1, null ]
+selected = 0
+
+[node name="sides" type="HSlider" parent="." index="1"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_left = 16.0
+margin_top = 44.0
+margin_right = 91.0
+margin_bottom = 60.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+hint_tooltip = "Sides"
+focus_mode = 2
+mouse_filter = 0
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 1
+size_flags_vertical = 0
+min_value = 3.0
+max_value = 16.0
+step = 1.0
+page = 0.0
+value = 3.0
+exp_edit = false
+rounded = false
+editable = true
+tick_count = 0
+ticks_on_borders = false
+focus_mode = 2
+_sections_unfolded = [ "Hint" ]
+
+[node name="radius" type="HSlider" parent="." index="2"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_left = 16.0
+margin_top = 61.0
+margin_right = 91.0
+margin_bottom = 77.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+hint_tooltip = "Radius"
+focus_mode = 2
+mouse_filter = 0
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 1
+size_flags_vertical = 0
+min_value = 0.0
+max_value = 1.0
+step = 0.01
+page = 0.0
+value = 1.0
+exp_edit = false
+rounded = false
+editable = true
+tick_count = 0
+ticks_on_borders = false
+focus_mode = 2
+_sections_unfolded = [ "Hint" ]
+
+[node name="edge" type="HSlider" parent="." index="3"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_left = 16.0
+margin_top = 78.0
+margin_right = 91.0
+margin_bottom = 94.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+focus_mode = 2
+mouse_filter = 0
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 1
+size_flags_vertical = 0
+min_value = 0.0
+max_value = 1.0
+step = 0.01
+page = 0.0
+value = 0.0
+exp_edit = false
+rounded = false
+editable = true
+tick_count = 0
+ticks_on_borders = false
+focus_mode = 2
+_sections_unfolded = [ "Hint" ]
+
+