Polygon node added

addons/ShaderLib/Procedural/Shapes/Polygon.gd

@@ -0,0 +1,71 @@
+@tool
+class_name VisualShaderNodeProceduralPolygon extends VisualShaderNodeCustom
+
+func _init() -> void:
+	_set_input_port_default_value(1, 3)
+	_set_input_port_default_value(2, 0.5)
+	_set_input_port_default_value(3, 0.5)
+
+	output_port_for_preview = 0
+
+func _get_name() -> String:
+	return "Polygon"
+
+func _get_category() -> String:
+	return "Procedural/Shapes"
+
+func _get_description() -> String:
+	return "Generates a regular polygon shape based on input UV at the size specified by inputs width and height. The polygon's amount of sides is determined by input sides."
+
+func _get_return_icon_type() -> VisualShaderNode.PortType:
+	return PORT_TYPE_SCALAR
+
+func _get_input_port_count() -> int:
+	return 4
+
+func _get_input_port_name(port: int) -> String:
+	match port:
+		0:
+			return "uv"
+		1:
+			return "sides"
+		2:
+			return "width"
+		3:
+			return "height"
+	return ""
+
+func _get_input_port_type(port: int) -> VisualShaderNode.PortType:
+	match port:
+		0:
+			return PORT_TYPE_VECTOR_2D
+		1:
+			return PORT_TYPE_SCALAR_INT
+		2, 3:
+			return PORT_TYPE_SCALAR
+	return PORT_TYPE_SCALAR
+
+func _get_output_port_count() -> int:
+	return 1
+
+func _get_output_port_name(port: int) -> String:
+	return "output"
+
+func _get_output_port_type(port: int) -> VisualShaderNode.PortType:
+	return PORT_TYPE_SCALAR
+
+func _get_global_code(mode: Shader.Mode) -> String:
+	var code: String = preload("Polygon.gdshaderinc").code
+	return code
+
+func _get_code(input_vars: Array[String], output_vars: Array[String], mode: Shader.Mode, type: VisualShader.Type) -> String:
+	var uv: String = "UV"
+
+	if input_vars[0]:
+		uv = input_vars[0]
+
+	var sides: String = input_vars[1]
+	var width: String = input_vars[2]
+	var height: String = input_vars[3]
+
+	return output_vars[0] + " = polygon_shape(%s, %s, %s, %s);" % [uv, sides, width, height]

addons/ShaderLib/Procedural/Shapes/Polygon.gdshaderinc

@@ -0,0 +1,10 @@
+float polygon_shape(vec2 uv, int sides, float width, float height){
+	float _a_width = width * cos(PI / float(sides));
+	float _a_height = height * cos(PI / float(sides));
+	uv = (uv * 2.0 - 1.0) / vec2(_a_width, _a_height);
+	uv.y *= -1.0;
+	float _polar_coords = atan(uv.x, uv.y);
+	float _radius = 2.0 * PI / float(sides);
+	float _distance = cos(floor(0.5 + _polar_coords / _radius) * _radius - _polar_coords) * length(uv);
+	return clamp((1.0 - _distance) / fwidth(_distance), 0.0, 1.0);
+}