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/Abstract2DNoise.hpp

@@ -0,0 +1,24 @@
+// 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_ABSTRACT2DNOISE_HPP
+#define NAZARA_ABSTRACT2DNOISE_HPP
+
+#include <Nazara/Prerequesites.hpp>
+#include <Nazara/Noise/MappedNoiseBase.hpp>
+
+template <typename T> class NAZARA_API NzAbstract2DNoise : public NzMappedNoiseBase<T>
+{
+    public:
+        virtual T GetMappedValue(T x, T y);
+        virtual T GetValue(T x, T y, T resolution) = 0;
+        virtual T GetValue(T x, T y);
+
+};
+
+#include <Nazara/Noise/Abstract2DNoise.inl>
+
+#endif // NAZARA_ABSTRACT2DNOISE_HPP