Noise viewer

extends Node

const TILE: float = 250.0
const GAP: float = 44.0
const COLUMNS: int = 3
const ROWS: int = 2
const SEED: int = 20260814

const TYPES: Array = [
	{name = 'SIMPLEX', type = FastNoiseLite.TYPE_SIMPLEX, frequency = 0.03},
	{name = 'SIMPLEX_SMOOTH', type = FastNoiseLite.TYPE_SIMPLEX_SMOOTH, frequency = 0.03},
	{name = 'PERLIN', type = FastNoiseLite.TYPE_PERLIN, frequency = 0.03},
	{name = 'VALUE', type = FastNoiseLite.TYPE_VALUE, frequency = 0.05},
	{name = 'VALUE_CUBIC', type = FastNoiseLite.TYPE_VALUE_CUBIC, frequency = 0.05},
	{name = 'CELLULAR', type = FastNoiseLite.TYPE_CELLULAR, frequency = 0.04},
]


func _ready() -> void:
	_add_background()

	var view: Vector2 = get_viewport().get_visible_rect().size
	var origin: Vector2 = Vector2(
		(view.x - COLUMNS * TILE - (COLUMNS - 1) * GAP) * 0.5,
		(view.y - ROWS * TILE - (ROWS - 1) * GAP) * 0.5 + 18.0
	)

	for row in ROWS:
		for column in COLUMNS:
			var entry: Dictionary = TYPES[row * COLUMNS + column]
			var at: Vector2 = origin + Vector2(column * (TILE + GAP), row * (TILE + GAP))

			var tile: TextureRect = TextureRect.new()
			tile.texture = _make_noise(entry.type, entry.frequency)
			tile.position = at
			tile.size = Vector2(TILE, TILE)
			tile.expand_mode = TextureRect.EXPAND_IGNORE_SIZE
			tile.stretch_mode = TextureRect.STRETCH_SCALE
			add_child(tile)

			_add_label(entry.name, at + Vector2(0, -26))

	print('six FastNoiseLite types with the same seed, change SEED for another set')


func _make_noise(type: FastNoiseLite.NoiseType, frequency: float) -> NoiseTexture2D:
	var noise: FastNoiseLite = FastNoiseLite.new()
	noise.noise_type = type
	noise.frequency = frequency
	noise.seed = SEED
	# the default FBM fractal blurs the types into the same cloud
	noise.fractal_type = FastNoiseLite.FRACTAL_NONE

	var texture: NoiseTexture2D = NoiseTexture2D.new()
	texture.noise = noise
	texture.color_ramp = _make_ramp()
	texture.width = 256
	texture.height = 256

	return texture


func _make_ramp() -> Gradient:
	var ramp: Gradient = Gradient.new()
	ramp.set_color(0, Color('#12141a'))
	ramp.set_color(1, Color('#8da5f3'))

	return ramp


func _add_label(text: String, at: Vector2) -> void:
	var label: Label = Label.new()
	label.text = text
	label.position = at
	label.add_theme_color_override('font_color', Color('#999999'))
	add_child(label)


func _add_background() -> void:
	var background: ColorRect = ColorRect.new()
	background.color = Color('#12141a')
	add_child(background)
	background.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)