A UV Rotate convenience node for Godot Visual Shader

UV_Rotate.gd

@tool
class_name VisualShaderNodeUvRotate
extends VisualShaderNodeCustom

func _get_name():
	return "UV Rotate"

func _get_description():
	return ""

func _get_return_icon_type():
	return PORT_TYPE_VECTOR_2D

func _get_input_port_count():
	return 3

func _get_input_port_name(port):
	if (port == 0): return "UV"
	if (port == 1): return "Center"
	return "Rotation"

func _get_input_port_type(port):
	if (port < 2): return PORT_TYPE_VECTOR_2D
	return PORT_TYPE_SCALAR

func _get_output_port_count():
	return 1

func _get_output_port_name(port):
	return "UV"

func _get_output_port_type(port):
	return PORT_TYPE_VECTOR_2D

func _get_code(inputVars, outputVars,
		mode, type):
	var UV = inputVars[0];
	var Center = inputVars[1];
	var Rotation = inputVars[2];
	var Out = outputVars[0];
	return "%s -= %s;\n" % [UV, Center] \
	+ "float s = sin(%s);\n" % Rotation \
	+ "float c = cos(%s);\n" % Rotation \
	+ "%s = vec2(c * %s.x - s * %s.y, s * %s.x + c * %s.y);\n" % [UV, UV, UV, UV, UV] \
	+ "%s += %s;\n" % [UV, Center] \
	+ "%s = %s;" % [Out, UV];