28 lines
684 B
C++
28 lines
684 B
C++
#pragma once
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#include <array>
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#include <cstdint>
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namespace vf {
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// Improved Perlin noise (Ken Perlin, 2002) over a seeded permutation table.
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// Output of noise2D/noise3D is in the range [-1, 1].
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class PerlinNoise {
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public:
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explicit PerlinNoise(uint32_t seed = 1337u) { reseed(seed); }
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void reseed(uint32_t seed);
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float noise2D(float x, float y) const;
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float noise3D(float x, float y, float z) const;
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// Fractal Brownian motion: sum of `octaves` scaled noise layers.
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// Result normalised to roughly [-1, 1].
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float fbm2D(float x, float y, int octaves, float lacunarity, float gain) const;
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private:
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std::array<int, 512> perm;
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};
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} // namespace vf
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