Noise: Refresh module using ZNoise

https://github.com/Overdrivr/ZNoise

Former-commit-id: ea7bbeb58a7147934523e2f600b1bd02f1cae5ed [formerly 581ab53941abbda68e00417592240f52ebd482e6]
Former-commit-id: e948aca78eb101292f0458365cfa39e6564d0462

src/Nazara/Noise/HybridMultiFractal.cpp

@@ -0,0 +1,42 @@
+// Copyright (C) 2016 Rémi Bèges
+// This file is part of the "Nazara Engine - Noise module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Noise/HybridMultiFractal.hpp>
+#include <Nazara/Noise/Debug.hpp>
+
+namespace Nz
+{
+	HybridMultiFractal::HybridMultiFractal(const NoiseBase & source) :
+	m_source(source)
+	{
+	}
+
+	float HybridMultiFractal::Get(std::initializer_list<float> coordinates, float scale) const
+	{
+		float offset = 1.0f;
+		float value = (m_source.Get(coordinates,scale) + offset) * m_exponent_array.at(0);
+		float weight = value;
+		float signal = 0.f;
+
+		scale *= m_lacunarity;
+
+		for(int i(1) ; i < m_octaves; ++i)
+		{
+			if (weight > 1.f)
+				weight = 1.f;
+
+			signal = (m_source.Get(coordinates,scale) + offset) * m_exponent_array.at(i);
+			value += weight * signal;
+			weight *= signal;
+			scale *= m_lacunarity;
+		}
+
+		float remainder = m_octaves - static_cast<int>(m_octaves);
+
+		if (remainder > 0.f)
+			value += remainder * m_source.Get(coordinates,scale) * m_exponent_array.at(static_cast<int>(m_octaves-1));
+
+		return value / m_sum - offset;
+	}
+}