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perlinNoise.h
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perlinNoise.h
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//
// perlinNoise.h
//
// This code is a fork from:
// https://solarianprogrammer.com/2012/07/18/perlin-noise-cpp-11/
// https://github.com/sol-prog/Perlin_Noise
//
////////////////////////////////////////////////////////////////////////////////
// THIS CLASS IS A TRANSLATION TO C++11 FROM THE REFERENCE
// JAVA IMPLEMENTATION OF THE IMPROVED PERLIN FUNCTION (see http://mrl.nyu.edu/~perlin/noise/)
// THE ORIGINAL JAVA IMPLEMENTATION IS COPYRIGHT 2002 KEN PERLIN
// I ADDED AN EXTRA METHOD THAT GENERATES A NEW PERMUTATION VECTOR (THIS IS NOT
// PRESENT IN THE ORIGINAL IMPLEMENTATION)
#pragma once
#include <vector>
////////////////////////////////////////////////////////////////////////////////
namespace sg {
#pragma pack (push, 1)
class PerlinNoise {
private:
// The permutation vector
// Initialize the permutation vector with the reference values
mutable std::vector<int> permVector_{
151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225, 140, 36, 103, 30, 69, 142,
8, 99, 37, 240, 21, 10, 23, 190, 6, 148, 247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117,
35, 11, 32, 57, 177, 33, 88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175, 74, 165, 71,
134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122, 60, 211, 133, 230, 220, 105, 92, 41,
55, 46, 245, 40, 244, 102, 143, 54, 65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89,
18, 169, 200, 196, 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64, 52, 217, 226,
250, 124, 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206, 59, 227, 47, 16, 58, 17, 182,
189, 28, 42, 223, 183, 170, 213, 119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155, 167,
43, 172, 9, 129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185, 112, 104, 218, 246,
97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241, 81, 51, 145, 235, 249, 14, 239,
107, 49, 192, 214, 31, 181, 199, 106, 157, 184, 84, 204, 176, 115, 121, 50, 45, 127, 4, 150, 254,
138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66, 215, 61, 156, 180};
mutable unsigned int seed_{0};
double
fade(double t) const noexcept;
double
lerp(double t, double a, double b) const noexcept;
double
grad(int hash, double x, double y, double z) const noexcept;
public:
// Initialize with the reference values for the permutation vector
PerlinNoise();
// Generate a new permutation vector based on the value of seed_
void
generateNewPermVector() const noexcept;
// Get a noise value, for 2D images z can have any value
double
noise(double x, double y, double z) const noexcept;
}; // class PerlinNoise
#pragma pack (pop)
} // namespace sg