Kayne Ruse
59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
/* Copyright: (c) Kayne Ruse 2014
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source
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* distribution.
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*/
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#ifndef PERLINNOISE_HPP_
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#define PERLINNOISE_HPP_
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#include "vector2.hpp"
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class SimpleRNG {
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public:
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SimpleRNG() = default;
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SimpleRNG(double x) { SetSeed(x); }
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double SetSeed(double s) { return seed = s; }
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double GetSeed() { return seed; }
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double operator()(double x);
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private:
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double seed = 8891.0;
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};
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class PerlinNoise {
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public:
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PerlinNoise() = default;
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~PerlinNoise() = default;
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Vector2 Gradient(Vector2);
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double Influcence(Vector2 gridPoint, Vector2 queryPoint);
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double Noise(double x, double y, double width, double height);
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private:
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static inline double Curve(double x);
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static inline double Snap(double x, double base);
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static inline double ScalarProduct(Vector2 lhs, Vector2 rhs);
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SimpleRNG rng;
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};
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#endif
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