Add FastNoiseLite / general noise overhaul

- replace OpenSimplexNoise

Co-authored-by: Cory Petkovsek <tinmanjuggernaut@users.noreply.github.com>

3 files changed, 288 insertions, 0 deletions

diff --git a/modules/noise/doc_classes/FastNoiseLite.xml b/modules/noise/doc_classes/FastNoiseLite.xml
new file mode 100644
index 0000000000..b6d91850c4
--- /dev/null
+++ b/modules/noise/doc_classes/FastNoiseLite.xml
@@ -0,0 +1,169 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="FastNoiseLite" inherits="Noise" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../doc/class.xsd">
+	<brief_description>
+		Generates noise using the FastNoiseLite library.
+	</brief_description>
+	<description>
+		This class generates noise using the FastNoiseLite library, which is a collection of several noise algorithms including Cellular, Perlin, Value, and more.
+		Most generated noise values are in the range of [code][-1,1][/code], however not always. Some of the cellular noise algorithms return results above [code]1[/code].
+	</description>
+	<tutorials>
+	</tutorials>
+	<members>
+		<member name="cellular_distance_function" type="int" setter="set_cellular_distance_function" getter="get_cellular_distance_function" enum="FastNoiseLite.CellularDistanceFunction" default="0">
+			Determines how the distance to the nearest/second-nearest point is computed. See [enum CellularDistanceFunction] for options.
+		</member>
+		<member name="cellular_jitter" type="float" setter="set_cellular_jitter" getter="get_cellular_jitter" default="0.45">
+			Maximum distance a point can move off of its grid position. Set to [code]0[/code] for an even grid.
+		</member>
+		<member name="cellular_return_type" type="int" setter="set_cellular_return_type" getter="get_cellular_return_type" enum="FastNoiseLite.CellularReturnType" default="0">
+			Return type from cellular noise calculations. See [enum CellularReturnType].
+		</member>
+		<member name="color_ramp" type="Gradient" setter="set_color_ramp" getter="get_color_ramp">
+			A [Gradient] which is used to map the luminance of each pixel to a color value.
+		</member>
+		<member name="domain_warp_amplitude" type="float" setter="set_domain_warp_amplitude" getter="get_domain_warp_amplitude" default="30.0">
+			Sets the maximum warp distance from the origin.
+		</member>
+		<member name="domain_warp_enabled" type="bool" setter="set_domain_warp_enabled" getter="is_domain_warp_enabled" default="false">
+			If enabled, another FastNoiseLite instance is used to warp the space, resulting in a distortion of the noise.
+		</member>
+		<member name="domain_warp_fractal_gain" type="float" setter="set_domain_warp_fractal_gain" getter="get_domain_warp_fractal_gain" default="0.5">
+			Determines the strength of each subsequent layer of the noise which is used to warp the space.
+			A low value places more emphasis on the lower frequency base layers, while a high value puts more emphasis on the higher frequency layers.
+		</member>
+		<member name="domain_warp_fractal_lacunarity" type="float" setter="set_domain_warp_fractal_lacunarity" getter="get_domain_warp_fractal_lacunarity" default="6.0">
+			Octave lacunarity of the fractal noise which warps the space. Increasing this value results in higher octaves producing noise with finer details and a rougher appearance.
+		</member>
+		<member name="domain_warp_fractal_octaves" type="int" setter="set_domain_warp_fractal_octaves" getter="get_domain_warp_fractal_octaves" default="5">
+			The number of noise layers that are sampled to get the final value for the fractal noise which warps the space.
+		</member>
+		<member name="domain_warp_fractal_type" type="int" setter="set_domain_warp_fractal_type" getter="get_domain_warp_fractal_type" enum="FastNoiseLite.DomainWarpFractalType" default="1">
+			The method for combining octaves into a fractal which is used to warp the space. See [enum DomainWarpFractalType].
+		</member>
+		<member name="domain_warp_frequency" type="float" setter="set_domain_warp_frequency" getter="get_domain_warp_frequency" default="0.05">
+			Frequency of the noise which warps the space. Low frequency results in smooth noise while high frequency results in rougher, more granular noise.
+		</member>
+		<member name="domain_warp_type" type="int" setter="set_domain_warp_type" getter="get_domain_warp_type" enum="FastNoiseLite.DomainWarpType" default="0">
+			Sets the warp algorithm. See [enum DomainWarpType].
+		</member>
+		<member name="fractal_gain" type="float" setter="set_fractal_gain" getter="get_fractal_gain" default="0.5">
+			Determines the strength of each subsequent layer of noise in fractal noise.
+			A low value places more emphasis on the lower frequency base layers, while a high value puts more emphasis on the higher frequency layers.
+		</member>
+		<member name="fractal_lacunarity" type="float" setter="set_fractal_lacunarity" getter="get_fractal_lacunarity" default="2.0">
+			Frequency multiplier between subsequent octaves. Increasing this value results in higher octaves producing noise with finer details and a rougher appearance.
+		</member>
+		<member name="fractal_octaves" type="int" setter="set_fractal_octaves" getter="get_fractal_octaves" default="5">
+			The number of noise layers that are sampled to get the final value for fractal noise types.
+		</member>
+		<member name="fractal_ping_pong_strength" type="float" setter="set_fractal_ping_pong_strength" getter="get_fractal_ping_pong_strength" default="2.0">
+			Sets the strength of the fractal ping pong type.
+		</member>
+		<member name="fractal_type" type="int" setter="set_fractal_type" getter="get_fractal_type" enum="FastNoiseLite.FractalType" default="1">
+			The method for combining octaves into a fractal. See [enum FractalType].
+		</member>
+		<member name="fractal_weighted_strength" type="float" setter="set_fractal_weighted_strength" getter="get_fractal_weighted_strength" default="0.0">
+			Higher weighting means higher octaves have less impact if lower octaves have a large impact.
+		</member>
+		<member name="frequency" type="float" setter="set_frequency" getter="get_frequency" default="0.01">
+			The frequency for all noise types. Low frequency results in smooth noise while high frequency results in rougher, more granular noise.
+		</member>
+		<member name="in_3d_space" type="bool" setter="set_in_3d_space" getter="is_in_3d_space" default="false">
+			Determines whether the noise image returned by [method Noise.get_image] is calculated in 3d space. May result in reduced contrast.
+		</member>
+		<member name="noise_type" type="int" setter="set_noise_type" getter="get_noise_type" enum="FastNoiseLite.NoiseType" default="1">
+			The noise algorithm used. See [enum NoiseType].
+		</member>
+		<member name="offset" type="Vector3" setter="set_offset" getter="get_offset" default="Vector3(0, 0, 0)">
+			Translate the noise input coordinates by the given [Vector3].
+		</member>
+		<member name="seed" type="int" setter="set_seed" getter="get_seed" default="0">
+			The random number seed for all noise types.
+		</member>
+	</members>
+	<constants>
+		<constant name="TYPE_VALUE" value="5" enum="NoiseType">
+			A lattice of points are assigned random values then interpolated based on neighboring values.
+		</constant>
+		<constant name="TYPE_VALUE_CUBIC" value="4" enum="NoiseType">
+			Similar to Value noise, but slower. Has more variance in peaks and valleys.
+			Cubic noise can be used to avoid certain artifacts when using value noise to create a bumpmap. In general, you should always use this mode if the value noise is being used for a heightmap or bumpmap.
+		</constant>
+		<constant name="TYPE_PERLIN" value="3" enum="NoiseType">
+			A lattice of random gradients. Their dot products are interpolated to obtain values in between the lattices.
+		</constant>
+		<constant name="TYPE_CELLULAR" value="2" enum="NoiseType">
+			Cellular includes both Worley noise and Voronoi diagrams which creates various regions of the same value.
+		</constant>
+		<constant name="TYPE_SIMPLEX" value="0" enum="NoiseType">
+			As opposed to [constant TYPE_PERLIN], gradients exist in a simplex lattice rather than a grid lattice, avoiding directional artifacts.
+		</constant>
+		<constant name="TYPE_SIMPLEX_SMOOTH" value="1" enum="NoiseType">
+			Modified, higher quality version of [constant TYPE_SIMPLEX], but slower.
+		</constant>
+		<constant name="FRACTAL_NONE" value="0" enum="FractalType">
+			No fractal noise.
+		</constant>
+		<constant name="FRACTAL_FBM" value="1" enum="FractalType">
+			Method using Fractional Brownian Motion to combine octaves into a fractal.
+		</constant>
+		<constant name="FRACTAL_RIDGED" value="2" enum="FractalType">
+			Method of combining octaves into a fractal resulting in a "ridged" look.
+		</constant>
+		<constant name="FRACTAL_PING_PONG" value="3" enum="FractalType">
+			Method of combining octaves into a fractal with a ping pong effect.
+		</constant>
+		<constant name="DISTANCE_EUCLIDEAN" value="0" enum="CellularDistanceFunction">
+			Euclidean distance to the nearest point.
+		</constant>
+		<constant name="DISTANCE_EUCLIDEAN_SQUARED" value="1" enum="CellularDistanceFunction">
+			Squared Euclidean distance to the nearest point.
+		</constant>
+		<constant name="DISTANCE_MANHATTAN" value="2" enum="CellularDistanceFunction">
+			Manhattan distance (taxicab metric) to the nearest point.
+		</constant>
+		<constant name="DISTANCE_HYBRID" value="3" enum="CellularDistanceFunction">
+			Blend of [constant DISTANCE_EUCLIDEAN] and [constant DISTANCE_MANHATTAN] to give curved cell boundaries
+		</constant>
+		<constant name="RETURN_CELL_VALUE" value="0" enum="CellularReturnType">
+			The cellular distance function will return the same value for all points within a cell.
+		</constant>
+		<constant name="RETURN_DISTANCE" value="1" enum="CellularReturnType">
+			The cellular distance function will return a value determined by the distance to the nearest point.
+		</constant>
+		<constant name="RETURN_DISTANCE2" value="2" enum="CellularReturnType">
+			The cellular distance function returns the distance to the second-nearest point.
+		</constant>
+		<constant name="RETURN_DISTANCE2_ADD" value="3" enum="CellularReturnType">
+			The distance to the nearest point is added to the distance to the second-nearest point.
+		</constant>
+		<constant name="RETURN_DISTANCE2_SUB" value="4" enum="CellularReturnType">
+			The distance to the nearest point is subtracted from the distance to the second-nearest point.
+		</constant>
+		<constant name="RETURN_DISTANCE2_MUL" value="5" enum="CellularReturnType">
+			The distance to the nearest point is multiplied with the distance to the second-nearest point.
+		</constant>
+		<constant name="RETURN_DISTANCE2_DIV" value="6" enum="CellularReturnType">
+			The distance to the nearest point is divided by the distance to the second-nearest point.
+		</constant>
+		<constant name="DOMAIN_WARP_SIMPLEX" value="0" enum="DomainWarpType">
+			The domain is warped using the simplex noise algorithm.
+		</constant>
+		<constant name="DOMAIN_WARP_SIMPLEX_REDUCED" value="1" enum="DomainWarpType">
+			The domain is warped using a simplified version of the simplex noise algorithm.
+		</constant>
+		<constant name="DOMAIN_WARP_BASIC_GRID" value="2" enum="DomainWarpType">
+			The domain is warped using a simple noise grid (not as smooth as the other methods, but more performant).
+		</constant>
+		<constant name="DOMAIN_WARP_FRACTAL_NONE" value="0" enum="DomainWarpFractalType">
+			No fractal noise for warping the space.
+		</constant>
+		<constant name="DOMAIN_WARP_FRACTAL_PROGRESSIVE" value="1" enum="DomainWarpFractalType">
+			Warping the space progressively, octave for octave, resulting in a more "liquified" distortion.
+		</constant>
+		<constant name="DOMAIN_WARP_FRACTAL_INDEPENDENT" value="2" enum="DomainWarpFractalType">
+			Warping the space independently for each octave, resulting in a more chaotic distortion.
+		</constant>
+	</constants>
+</class>
diff --git a/modules/noise/doc_classes/Noise.xml b/modules/noise/doc_classes/Noise.xml
new file mode 100644
index 0000000000..db0dec18d2
--- /dev/null
+++ b/modules/noise/doc_classes/Noise.xml
@@ -0,0 +1,72 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="Noise" inherits="Resource" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../doc/class.xsd">
+	<brief_description>
+		Abstract base class for noise generators.
+	</brief_description>
+	<description>
+		This class defines the interface for noise generation libraries to inherit from.
+		A default get_seamless_noise() implementation is provided for libraries that do not provide seamless noise. This function requests a larger image from get_image(), reverses the quadrants of the image, then uses the strips of extra width to blend over the seams.
+		Inheriting noise classes can optionally override this function to provide a more optimal algorithm.
+	</description>
+	<tutorials>
+	</tutorials>
+	<methods>
+		<method name="get_image">
+			<return type="Image" />
+			<argument index="0" name="width" type="int" />
+			<argument index="1" name="height" type="int" />
+			<argument index="2" name="invert" type="bool" default="false" />
+			<description>
+				Returns a 2D [Image] noise image.
+			</description>
+		</method>
+		<method name="get_noise_1d">
+			<return type="float" />
+			<argument index="0" name="x" type="float" />
+			<description>
+				Returns the 1D noise value at the given (x) coordinate.
+			</description>
+		</method>
+		<method name="get_noise_2d">
+			<return type="float" />
+			<argument index="0" name="x" type="float" />
+			<argument index="1" name="y" type="float" />
+			<description>
+				Returns the 2D noise value at the given position.
+			</description>
+		</method>
+		<method name="get_noise_2dv">
+			<return type="float" />
+			<argument index="0" name="v" type="Vector2" />
+			<description>
+				Returns the 2D noise value at the given position.
+			</description>
+		</method>
+		<method name="get_noise_3d">
+			<return type="float" />
+			<argument index="0" name="x" type="float" />
+			<argument index="1" name="y" type="float" />
+			<argument index="2" name="z" type="float" />
+			<description>
+				Returns the 3D noise value at the given position.
+			</description>
+		</method>
+		<method name="get_noise_3dv">
+			<return type="float" />
+			<argument index="0" name="v" type="Vector3" />
+			<description>
+				Returns the 3D noise value at the given position.
+			</description>
+		</method>
+		<method name="get_seamless_image">
+			<return type="Image" />
+			<argument index="0" name="width" type="int" />
+			<argument index="1" name="height" type="int" />
+			<argument index="2" name="invert" type="bool" default="false" />
+			<argument index="3" name="skirt" type="float" default="0.1" />
+			<description>
+				Returns a seamless 2D [Image] noise image.
+			</description>
+		</method>
+	</methods>
+</class>
diff --git a/modules/noise/doc_classes/NoiseTexture.xml b/modules/noise/doc_classes/NoiseTexture.xml
new file mode 100644
index 0000000000..63630eccde
--- /dev/null
+++ b/modules/noise/doc_classes/NoiseTexture.xml
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="NoiseTexture" inherits="Texture2D" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../doc/class.xsd">
+	<brief_description>
+		A texture filled with noise generated by a [Noise] object.
+	</brief_description>
+	<description>
+		Uses [FastNoiseLite] or other libraries to fill the texture data of your desired size.
+		NoiseTexture can also generate normalmap textures.
+		The class uses [Thread]s to generate the texture data internally, so [method Texture2D.get_image] may return [code]null[/code] if the generation process has not completed yet. In that case, you need to wait for the texture to be generated before accessing the image and the generated byte data:
+		[codeblock]
+		var texture = NoiseTexture.new()
+		texture.noise = FastNoiseLite.new()
+		await texture.changed
+		var image = texture.get_image()
+		var data = image.get_data()
+		[/codeblock]
+	</description>
+	<tutorials>
+	</tutorials>
+	<members>
+		<member name="as_normal_map" type="bool" setter="set_as_normal_map" getter="is_normal_map" default="false">
+			If [code]true[/code], the resulting texture contains a normal map created from the original noise interpreted as a bump map.
+		</member>
+		<member name="bump_strength" type="float" setter="set_bump_strength" getter="get_bump_strength" default="8.0">
+			Strength of the bump maps used in this texture. A higher value will make the bump maps appear larger while a lower value will make them appear softer.
+		</member>
+		<member name="height" type="int" setter="set_height" getter="get_height" default="512">
+			Height of the generated texture.
+		</member>
+		<member name="invert" type="bool" setter="set_invert" getter="get_invert" default="false">
+			If [code]true[/code], inverts the noise texture. White becomes black, black becomes white.
+		</member>
+		<member name="noise" type="Noise" setter="set_noise" getter="get_noise">
+			The instance of the [Noise] object.
+		</member>
+		<member name="seamless" type="bool" setter="set_seamless" getter="get_seamless" default="false">
+			If [code]true[/code], a seamless texture is requested from the [Noise] resource.
+			[b]Note:[/b] Seamless noise textures may take longer to generate and/or can have a lower contrast compared to non-seamless noise depending on the used [Noise] resource. This is because some implementations use higher dimensions for generating seamless noise.
+		</member>
+		<member name="seamless_blend_skirt" type="float" setter="set_seamless_blend_skirt" getter="get_seamless_blend_skirt" default="0.1">
+			Used for the default/fallback implementation of the seamless texture generation. It determines the distance over which the seams are blended. High values may result in less details and contrast. See [Noise] for further details.
+		</member>
+		<member name="width" type="int" setter="set_width" getter="get_width" default="512">
+			Width of the generated texture.
+		</member>
+	</members>
+</class>