Created new PerlinNoise class from the Noise.h+Noise.cpp code in the osgshaders example.

include/osgUtil/PerlinNoise

@@ -0,0 +1,97 @@
+/* -*-c++-*-
+*
+*  OpenSceneGraph example, osgshaders.
+*
+*  Permission is hereby granted, free of charge, to any person obtaining a copy
+*  of this software and associated documentation files (the "Software"), to deal
+*  in the Software without restriction, including without limitation the rights
+*  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+*  copies of the Software, and to permit persons to whom the Software is
+*  furnished to do so, subject to the following conditions:
+*
+*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+*  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+*  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+*  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+*  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+*  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+*  THE SOFTWARE.
+*/
+
+
+/************************************************************************
+ *                                                                      *
+ *                   Copyright (C) 2002  3Dlabs Inc. Ltd.               *
+ *                                                                      *
+ ***********************************************************************/
+
+/* Adapted from osgshaders example by Robert Osfield for use as part of osgUtil.*/
+
+#ifndef PERLINENOISE_H
+#define PERLINENOISE_H
+
+#include <osg/Texture3D>
+#include <osgUtil/Export>
+
+namespace osgUtil
+{
+
+class OSGUTIL_EXPORT PerlinNoise
+{
+public:
+
+    PerlinNoise();
+    
+    void SetNoiseFrequency(int frequency);
+
+    double noise1(double arg);
+    double noise2(double vec[2]);
+    double noise3(double vec[3]);
+    void normalize2(double vec[2]);
+    void normalize3(double vec[3]);
+
+    /*
+    In what follows "alpha" is the weight when the sum is formed.
+    Typically it is 2, As this approaches 1 the function is noisier.
+    "beta" is the harmonic scaling/spacing, typically 2.
+    */
+
+    double PerlinNoise1D(double x,double alpha, double beta, int n);
+    double PerlinNoise2D(double x,double y,double alpha, double beta, int n);
+    double PerlinNoise3D(double x,double y,double z,double alpha, double beta, int n);
+
+    osg::Image* create3DNoiseImage(int texSize);
+    osg::Texture3D* create3DNoiseTexture(int texSize );
+    
+protected:
+     
+    void initNoise(void);
+
+    enum { MAXB = 0x100 };
+    
+    int p[MAXB + MAXB + 2];
+    double g3[MAXB + MAXB + 2][3];
+    double g2[MAXB + MAXB + 2][2];
+    double g1[MAXB + MAXB + 2];
+
+    int start;
+    int B;
+    int BM;
+    
+};
+
+inline osg::Image* create3DNoiseImage(int texSize)
+{
+    PerlinNoise pn;
+    return pn.create3DNoiseImage(texSize);
+}
+
+inline osg::Texture3D* create3DNoiseTexture(int texSize )
+{
+    PerlinNoise pn;
+    return pn.create3DNoiseTexture(texSize);
+}
+
+}
+
+#endif // PERLINENOISE_H