Improved interface

*MappedNoiseBase provides a gain and offset control on the noise value
*AbstractXDNoise provides a way to contain different noises in a std
container and access the main "GetValue" member function
*Applied minor optimisation to Perlin4D (previously forgotten)

include/Nazara/Noise/MappedNoiseBase.hpp

@@ -0,0 +1,32 @@
+// Copyright (C) 2012 Rémi Bèges
+// This file is part of the "Nazara Engine".
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_MAPPEDNOISEBASE_HPP
+#define NAZARA_MAPPEDNOISEBASE_HPP
+
+#include <Nazara/Prerequesites.hpp>
+
+template <typename T> class NzMappedNoiseBase
+{
+    public:
+        NzMappedNoiseBase();
+        ~NzMappedNoiseBase() = default;
+
+        T GetGain() const;
+        T GetOffset() const;
+        T GetResolution() const;
+        void SetGain(T gain);
+        void SetOffset(T offset);
+        void SetResolution(T resolution);
+    protected:
+        T m_gain;
+        T m_offset;
+        T m_resolution;
+};
+
+#include <Nazara/Noise/MappedNoiseBase.inl>
+
+#endif // NAZARA_MAPPEDNOISEBASE_HPP