Noise: Refresh module using ZNoise

https://github.com/Overdrivr/ZNoise

Former-commit-id: 3f7be1c8fd14e074826ca667676412ea4989621c [formerly 882d0bdad12c264766dc00869ac07bbecbee7306]
Former-commit-id: b12a4654bb5b9ff3fdd474704d66aa10fd2d756d

src/Nazara/Noise/MixerBase.cpp

@@ -0,0 +1,56 @@
+// 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/MixerBase.hpp>
+#include <cmath>
+#include <Nazara/Noise/Debug.hpp>
+
+namespace Nz
+{
+	MixerBase::MixerBase() :
+	m_hurst(1.2f),
+	m_lacunarity(5.f),
+	m_octaves(3.f)
+	{
+		Recompute();
+	}
+
+	float MixerBase::GetHurstParameter() const
+	{
+		return m_hurst;
+	}
+
+	float MixerBase::GetLacunarity() const
+	{
+		return m_lacunarity;
+	}
+
+	float MixerBase::GetOctaveNumber() const
+	{
+		return m_octaves;
+	}
+
+	void MixerBase::SetParameters(float hurst, float lacunarity, float octaves)
+	{
+		m_hurst = hurst;
+		m_lacunarity = lacunarity;
+		m_octaves = octaves;
+
+		Recompute();
+	}
+
+	void MixerBase::Recompute()
+	{
+		float frequency = 1.0;
+		m_sum = 0.f;
+		m_exponent_array.clear();
+
+		for (int i(0) ; i < static_cast<int>(m_octaves) ; ++i)
+		{
+			m_exponent_array.push_back(std::pow( frequency, -m_hurst ));
+			frequency *= m_lacunarity;
+			m_sum += m_exponent_array.at(i);
+		}
+	}
+}