godot/modules/opensimplex/open_simplex_noise.cpp

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/*  open_simplex_noise.cpp                                               */
/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "open_simplex_noise.h"

#include "core/core_string_names.h"

OpenSimplexNoise::OpenSimplexNoise() {
	seed = 0;
	persistence = 0.5;
	octaves = 3;
	period = 64;
	lacunarity = 2.0;

	_init_seeds();
}

OpenSimplexNoise::~OpenSimplexNoise() {
}

void OpenSimplexNoise::_init_seeds() {
	for (int i = 0; i < MAX_OCTAVES; ++i) {
		open_simplex_noise(seed + i * 2, &(contexts[i]));
	}
}

void OpenSimplexNoise::set_seed(int p_seed) {
	if (seed == p_seed) {
		return;
	}

	seed = p_seed;

	_init_seeds();

	emit_changed();
}

int OpenSimplexNoise::get_seed() const {
	return seed;
}

void OpenSimplexNoise::set_octaves(int p_octaves) {
	if (p_octaves == octaves) {
		return;
	}

	ERR_FAIL_COND_MSG(p_octaves > MAX_OCTAVES, vformat("The number of OpenSimplexNoise octaves is limited to %d; ignoring the new value.", MAX_OCTAVES));

	octaves = CLAMP(p_octaves, 1, MAX_OCTAVES);
	emit_changed();
}

void OpenSimplexNoise::set_period(float p_period) {
	if (p_period == period) {
		return;
	}
	period = p_period;
	emit_changed();
}

void OpenSimplexNoise::set_persistence(float p_persistence) {
	if (p_persistence == persistence) {
		return;
	}
	persistence = p_persistence;
	emit_changed();
}

void OpenSimplexNoise::set_lacunarity(float p_lacunarity) {
	if (p_lacunarity == lacunarity) {
		return;
	}
	lacunarity = p_lacunarity;
	emit_changed();
}

Ref<Image> OpenSimplexNoise::get_image(int p_width, int p_height, const Vector2 &p_noise_offset) const {
	PoolVector<uint8_t> data;
	data.resize(p_width * p_height);

	PoolVector<uint8_t>::Write wd8 = data.write();

	for (int i = 0; i < p_height; i++) {
		for (int j = 0; j < p_width; j++) {
			float v = get_noise_2d(float(j) + p_noise_offset.x, float(i) + p_noise_offset.y);
			v = v * 0.5 + 0.5; // Normalize [0..1]
			wd8[(i * p_width + j)] = uint8_t(CLAMP(v * 255.0, 0, 255));
		}
	}

	Ref<Image> image = memnew(Image(p_width, p_height, false, Image::FORMAT_L8, data));
	return image;
}

Ref<Image> OpenSimplexNoise::get_seamless_image(int p_size) const {
	PoolVector<uint8_t> data;
	data.resize(p_size * p_size);

	PoolVector<uint8_t>::Write wd8 = data.write();

	for (int i = 0; i < p_size; i++) {
		for (int j = 0; j < p_size; j++) {
			float ii = (float)i / (float)p_size;
			float jj = (float)j / (float)p_size;

			ii *= 2.0 * Math_PI;
			jj *= 2.0 * Math_PI;

			float radius = p_size / (2.0 * Math_PI);

			float x = radius * Math::sin(jj);
			float y = radius * Math::cos(jj);
			float z = radius * Math::sin(ii);
			float w = radius * Math::cos(ii);
			float v = get_noise_4d(x, y, z, w);

			v = v * 0.5 + 0.5; // Normalize [0..1]
			wd8[(i * p_size + j)] = uint8_t(CLAMP(v * 255.0, 0, 255));
		}
	}

	Ref<Image> image = memnew(Image(p_size, p_size, false, Image::FORMAT_L8, data));
	return image;
}

void OpenSimplexNoise::_bind_methods() {
	ClassDB::bind_method(D_METHOD("get_seed"), &OpenSimplexNoise::get_seed);
	ClassDB::bind_method(D_METHOD("set_seed", "seed"), &OpenSimplexNoise::set_seed);

	ClassDB::bind_method(D_METHOD("set_octaves", "octave_count"), &OpenSimplexNoise::set_octaves);
	ClassDB::bind_method(D_METHOD("get_octaves"), &OpenSimplexNoise::get_octaves);

	ClassDB::bind_method(D_METHOD("set_period", "period"), &OpenSimplexNoise::set_period);
	ClassDB::bind_method(D_METHOD("get_period"), &OpenSimplexNoise::get_period);

	ClassDB::bind_method(D_METHOD("set_persistence", "persistence"), &OpenSimplexNoise::set_persistence);
	ClassDB::bind_method(D_METHOD("get_persistence"), &OpenSimplexNoise::get_persistence);

	ClassDB::bind_method(D_METHOD("set_lacunarity", "lacunarity"), &OpenSimplexNoise::set_lacunarity);
	ClassDB::bind_method(D_METHOD("get_lacunarity"), &OpenSimplexNoise::get_lacunarity);

	ClassDB::bind_method(D_METHOD("get_image", "width", "height", "noise_offset"), &OpenSimplexNoise::get_image, DEFVAL(Vector2()));
	ClassDB::bind_method(D_METHOD("get_seamless_image", "size"), &OpenSimplexNoise::get_seamless_image);

	ClassDB::bind_method(D_METHOD("get_noise_1d", "x"), &OpenSimplexNoise::get_noise_1d);
	ClassDB::bind_method(D_METHOD("get_noise_2d", "x", "y"), &OpenSimplexNoise::get_noise_2d);
	ClassDB::bind_method(D_METHOD("get_noise_3d", "x", "y", "z"), &OpenSimplexNoise::get_noise_3d);
	ClassDB::bind_method(D_METHOD("get_noise_4d", "x", "y", "z", "w"), &OpenSimplexNoise::get_noise_4d);

	ClassDB::bind_method(D_METHOD("get_noise_2dv", "pos"), &OpenSimplexNoise::get_noise_2dv);
	ClassDB::bind_method(D_METHOD("get_noise_3dv", "pos"), &OpenSimplexNoise::get_noise_3dv);

	ADD_PROPERTY(PropertyInfo(Variant::INT, "seed"), "set_seed", "get_seed");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "octaves", PROPERTY_HINT_RANGE, vformat("1,%d,1", MAX_OCTAVES)), "set_octaves", "get_octaves");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "period", PROPERTY_HINT_RANGE, "0.1,256.0,0.1"), "set_period", "get_period");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "persistence", PROPERTY_HINT_RANGE, "0.0,1.0,0.001"), "set_persistence", "get_persistence");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "lacunarity", PROPERTY_HINT_RANGE, "0.1,4.0,0.01"), "set_lacunarity", "get_lacunarity");
}

float OpenSimplexNoise::get_noise_1d(float x) const {
	return get_noise_2d(x, 1.0);
}

float OpenSimplexNoise::get_noise_2d(float x, float y) const {
	x /= period;
	y /= period;

	float amp = 1.0;
	float max = 1.0;
	float sum = _get_octave_noise_2d(0, x, y);

	int i = 0;
	while (++i < octaves) {
		x *= lacunarity;
		y *= lacunarity;
		amp *= persistence;
		max += amp;
		sum += _get_octave_noise_2d(i, x, y) * amp;
	}

	return sum / max;
}

float OpenSimplexNoise::get_noise_3d(float x, float y, float z) const {
	x /= period;
	y /= period;
	z /= period;

	float amp = 1.0;
	float max = 1.0;
	float sum = _get_octave_noise_3d(0, x, y, z);

	int i = 0;
	while (++i < octaves) {
		x *= lacunarity;
		y *= lacunarity;
		z *= lacunarity;
		amp *= persistence;
		max += amp;
		sum += _get_octave_noise_3d(i, x, y, z) * amp;
	}

	return sum / max;
}

float OpenSimplexNoise::get_noise_4d(float x, float y, float z, float w) const {
	x /= period;
	y /= period;
	z /= period;
	w /= period;

	float amp = 1.0;
	float max = 1.0;
	float sum = _get_octave_noise_4d(0, x, y, z, w);

	int i = 0;
	while (++i < octaves) {
		x *= lacunarity;
		y *= lacunarity;
		z *= lacunarity;
		w *= lacunarity;
		amp *= persistence;
		max += amp;
		sum += _get_octave_noise_4d(i, x, y, z, w) * amp;
	}

	return sum / max;
}