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+/*************************************************************************/
+/* simplex_noise.cpp */
+/*************************************************************************/
+/* This file is part of: */
+/* GODOT ENGINE */
+/* https://godotengine.org */
+/*************************************************************************/
+/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
+/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md) */
+/* */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the */
+/* "Software"), to deal in the Software without restriction, including */
+/* without limitation the rights to use, copy, modify, merge, publish, */
+/* distribute, sublicense, and/or sell copies of the Software, and to */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions: */
+/* */
+/* The above copyright notice and this permission notice shall be */
+/* included in all copies or substantial portions of the Software. */
+/* */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
+/*************************************************************************/
+
+#include "simplex_noise.h"
+
+#include "core/core_string_names.h"
+
+SimplexNoise::SimplexNoise() {
+
+ seed = 0;
+ persistence = 0.5;
+ octaves = 3;
+ period = 64;
+ lacunarity = 2.0;
+
+ _init_seeds();
+}
+
+SimplexNoise::~SimplexNoise() {
+}
+
+void SimplexNoise::_init_seeds() {
+ for (int i = 0; i < 6; ++i) {
+ open_simplex_noise(seed + i * 2, &(contexts[i]));
+ }
+}
+
+void SimplexNoise::set_seed(int p_seed) {
+
+ if (seed == p_seed)
+ return;
+
+ seed = p_seed;
+
+ _init_seeds();
+
+ emit_changed();
+}
+
+int SimplexNoise::get_seed() {
+
+ return seed;
+}
+
+void SimplexNoise::set_octaves(int p_octaves) {
+ if (p_octaves == octaves) return;
+ octaves = CLAMP(p_octaves, 1, 6);
+ emit_changed();
+}
+
+void SimplexNoise::set_period(float p_period) {
+ if (p_period == period) return;
+ period = p_period;
+ emit_changed();
+}
+
+void SimplexNoise::set_persistence(float p_persistence) {
+ if (p_persistence == persistence) return;
+ persistence = p_persistence;
+ emit_changed();
+}
+
+void SimplexNoise::set_lacunarity(float p_lacunarity) {
+ if (p_lacunarity == lacunarity) return;
+ lacunarity = p_lacunarity;
+ emit_changed();
+}
+
+Ref<Image> SimplexNoise::get_image(int p_width, int p_height) {
+
+ PoolVector<uint8_t> data;
+ data.resize(p_width * p_height * 4);
+
+ 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(i, j);
+ v = v * 0.5 + 0.5; // Normalize [0..1]
+ uint8_t value = uint8_t(CLAMP(v * 255.0, 0, 255));
+ wd8[(i * p_width + j) * 4 + 0] = value;
+ wd8[(i * p_width + j) * 4 + 1] = value;
+ wd8[(i * p_width + j) * 4 + 2] = value;
+ wd8[(i * p_width + j) * 4 + 3] = 255;
+ }
+ }
+
+ Ref<Image> image = memnew(Image(p_width, p_height, false, Image::FORMAT_RGBA8, data));
+ return image;
+}
+
+Ref<Image> SimplexNoise::get_seamless_image(int p_size) {
+
+ PoolVector<uint8_t> data;
+ data.resize(p_size * p_size * 4);
+
+ 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]
+ uint8_t value = uint8_t(CLAMP(v * 255.0, 0, 255));
+ wd8[(i * p_size + j) * 4 + 0] = value;
+ wd8[(i * p_size + j) * 4 + 1] = value;
+ wd8[(i * p_size + j) * 4 + 2] = value;
+ wd8[(i * p_size + j) * 4 + 3] = 255;
+ }
+ }
+
+ Ref<Image> image = memnew(Image(p_size, p_size, false, Image::FORMAT_RGBA8, data));
+ return image;
+}
+
+void SimplexNoise::_bind_methods() {
+
+ ClassDB::bind_method(D_METHOD("get_seed"), &SimplexNoise::get_seed);
+ ClassDB::bind_method(D_METHOD("set_seed", "seed"), &SimplexNoise::set_seed);
+
+ ClassDB::bind_method(D_METHOD("set_octaves", "octave_count"), &SimplexNoise::set_octaves);
+ ClassDB::bind_method(D_METHOD("get_octaves"), &SimplexNoise::get_octaves);
+
+ ClassDB::bind_method(D_METHOD("set_period", "period"), &SimplexNoise::set_period);
+ ClassDB::bind_method(D_METHOD("get_period"), &SimplexNoise::get_period);
+
+ ClassDB::bind_method(D_METHOD("set_persistence", "persistence"), &SimplexNoise::set_persistence);
+ ClassDB::bind_method(D_METHOD("get_persistence"), &SimplexNoise::get_persistence);
+
+ ClassDB::bind_method(D_METHOD("set_lacunarity", "lacunarity"), &SimplexNoise::set_lacunarity);
+ ClassDB::bind_method(D_METHOD("get_lacunarity"), &SimplexNoise::get_lacunarity);
+
+ ClassDB::bind_method(D_METHOD("get_image", "width", "height"), &SimplexNoise::get_image);
+ ClassDB::bind_method(D_METHOD("get_seamless_image", "size"), &SimplexNoise::get_seamless_image);
+
+ ClassDB::bind_method(D_METHOD("get_noise_2d", "x", "y"), &SimplexNoise::get_noise_2d);
+ ClassDB::bind_method(D_METHOD("get_noise_3d", "x", "y", "z"), &SimplexNoise::get_noise_3d);
+ ClassDB::bind_method(D_METHOD("get_noise_4d", "x", "y", "z", "w"), &SimplexNoise::get_noise_4d);
+
+ ClassDB::bind_method(D_METHOD("get_noise_2dv", "pos"), &SimplexNoise::get_noise_2dv);
+ ClassDB::bind_method(D_METHOD("get_noise_3dv", "pos"), &SimplexNoise::get_noise_3dv);
+
+ ADD_PROPERTY(PropertyInfo(Variant::INT, "seed"), "set_seed", "get_seed");
+ ADD_PROPERTY(PropertyInfo(Variant::INT, "octaves", PROPERTY_HINT_RANGE, "1,6,1"), "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 SimplexNoise::get_noise_2d(float x, float y) {
+
+ x /= period;
+ y /= period;
+
+ float amp = 1.0;
+ float max = 1.0;
+ float sum = _get_octave_noise_2d(0, x, y);
+
+ unsigned 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 SimplexNoise::get_noise_3d(float x, float y, float z) {
+
+ x /= period;
+ y /= period;
+ z /= period;
+
+ float amp = 1.0;
+ float max = 1.0;
+ float sum = _get_octave_noise_3d(0, x, y, z);
+
+ unsigned 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 SimplexNoise::get_noise_4d(float x, float y, float z, float w) {
+
+ 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);
+
+ unsigned 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;
+}
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