Initial commit, basic infrastructure

perlin/perlin_noise.hpp

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