PerlinNoiseCloud.h

#pragma once
#include "Cloud2D.h"
#include <osg/Geometry>
#include <osg/Geode>
#include <osg/Texture2D>
#include <osg/Image>
#include <osgUtil/SmoothingVisitor>
#include <osgUtil/TangentSpaceGenerator>
#include <osg/BlendFunc>
#include <osgDB/ReadFile>

#include <cstdlib>
#include <iostream>
#include <math.h>
#include <stdio.h>

//Umsetzung von:
//Wolken (Geometry, Idee): http://freespace.virgin.net/hugo.elias/models/m_clouds.htm
//Perlin Noise: http://freespace.virgin.net/hugo.elias/models/m_perlin.htm
//NormalMap: http://code.google.com/p/gimp-normalmap/source/browse/trunk/normalmap.c
//+ Parallax Mapping

namespace osgCloudyDay
{
        class PerlinNoiseCloud : public osgCloudyDay::Cloud2D
        {
        public:
                PerlinNoiseCloud(void);
                ~PerlinNoiseCloud(void);

                void Initialize();
                
                virtual void SetupGeometry(osg::Vec3 position, osg::Vec2 size, osg::Vec3Array* vertices, osg::Vec2Array* tcoords, osg::UIntArray* indices);

        protected:
                void CreatePerlinTexture2D(int width, int height, osg::Image* color, osg::Image* normal);

                void SetNoise(float  *map);

                float Noise(int x, int y);
                float SmoothedNoise(float x, float y);
                float Cosine_Interpolate(float a, float b, float x);
                float InterpolatedNoise(float x, float y);
                float PerlinNoise(float x, float y);
        };
}