Suppressed perlin1d, added perlin 2,3,4 and simplex 2 classes + minor

fixes/optimisations on noisemachine

include/Nazara/Noise/Perlin2D.inl

@@ -0,0 +1,65 @@
+// 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
+
+#include <Nazara/Noise/Error.hpp>
+#include <Nazara/Noise/Config.hpp>
+#include <Nazara/Noise/Debug.hpp>
+
+template <typename T>
+NzPerlin2D<T>::NzPerlin2D()
+{
+    T unit = 1.0/sqrt(2);
+    T grad2Temp[][2] = {{unit,unit},{-unit,unit},{unit,-unit},{-unit,-unit},
+                            {1,0},{-1,0},{0,1},{0,-1}};
+
+    for(int i(0) ; i < 8 ; ++i)
+        for(int j(0) ; j < 2 ; ++j)
+            gradient2[i][j] = grad2Temp[i][j];
+}
+
+template <typename T>
+T NzPerlin2D<T>::GetValue(T x, T y, T res)
+{
+    nx = x/res;
+    ny = y/res;
+
+    x0 = static_cast<int>(nx);
+    y0 = static_cast<int>(ny);
+
+    ii = x0 & 255;
+    jj = y0 & 255;
+
+    gi0 = perm[ii + perm[jj]] & 7;
+    gi1 = perm[ii + 1 + perm[jj]] & 7;
+    gi2 = perm[ii + perm[jj + 1]] & 7;
+    gi3 = perm[ii + 1 + perm[jj + 1]] & 7;
+
+    temp.x = nx-x0;
+    temp.y = ny-y0;
+    s = gradient2[gi0][0]*temp.x + gradient2[gi0][1]*temp.y;
+
+    temp.x = nx-(x0+1);
+    temp.y = ny-y0;
+    t = gradient2[gi1][0]*temp.x + gradient2[gi1][1]*temp.y;
+
+    temp.x = nx-x0;
+    temp.y = ny-(y0+1);
+    u = gradient2[gi2][0]*temp.x + gradient2[gi2][1]*temp.y;
+
+    temp.x = nx-(x0+1);
+    temp.y = ny-(y0+1);
+    v = gradient2[gi3][0]*temp.x + gradient2[gi3][1]*temp.y;
+
+    tmp = nx-x0;
+    Cx = tmp * tmp * tmp * (tmp * (tmp * 6 - 15) + 10);
+
+    Li1 = s + Cx*(t-s);
+    Li2 = u + Cx*(v-u);
+
+    tmp = ny - y0;
+    Cy = tmp * tmp * tmp * (tmp * (tmp * 6 - 15) + 10);
+
+    return Li1 + Cy*(Li2-Li1);
+}
+