vtkLICNoiseHelper.h

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/*=========================================================================

  Program:   Visualization Toolkit

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef vtkLICNoiseHelper_h
#define vtkLICNoiseHelper_h

#include "vtkRenderingLICOpenGL2Module.h" // for export

#include "vtkMinimalStandardRandomSequence.h"

class vtkImageData;

class vtkLICRandomNumberGeneratorInterface
{
public:
  vtkLICRandomNumberGeneratorInterface()
  {
    this->RNG = vtkMinimalStandardRandomSequence::New();
  }

  ~vtkLICRandomNumberGeneratorInterface()
  {
    this->RNG->Delete();
  }

  void SetSeed(int seedVal)
  {
    this->RNG->SetSeed(seedVal);
  }

  double GetRandomNumber()
  {
    double val = this->RNG->GetValue();
    this->RNG->Next();
    return val;
  }

private:
  void operator=(const vtkLICRandomNumberGeneratorInterface &) VTK_DELETE_FUNCTION;
  vtkLICRandomNumberGeneratorInterface(const vtkLICRandomNumberGeneratorInterface &) VTK_DELETE_FUNCTION;

private:
  vtkMinimalStandardRandomSequence *RNG;
};

class vtkLICRandomNoise2D
{
public:
  vtkLICRandomNoise2D(){}


  enum {
    UNIFORM = 0,
    GAUSSIAN = 1,
    PERLIN = 2
  };
  float *Generate(
        int type,
        int &sideLen,
        int &grainLize,
        float minNoiseVal,
        float maxNoiseVal,
        int nLevels,
        double impulseProb,
        float impulseBgNoiseVal,
        int seed);

  void DeleteValues(unsigned char *vals){ free(vals); }

  static vtkImageData *GetNoiseResource();

private:
  float *GenerateUniform(
        int sideLen,
        int grainLize,
        float minNoiseVal,
        float maxNoiseVal,
        int nLevels,
        double impulseProb,
        float impulseBgNoiseVal,
        int seed);

  float *GenerateGaussian(
        int sideLen,
        int grainLize,
        float minNoiseVal,
        float maxNoiseVal,
        int nLevels,
        double impulseProb,
        float impulseBgNoiseVal,
        int seed);

  float *GeneratePerlin(
        int sideLen,
        int grainLize,
        float minNoiseVal,
        float maxNoiseVal,
        int nLevels,
        double impulseProb,
        float impulseBgNoiseVal,
        int seed);

  int ShouldGenerateValue(double prob);

  void GetValidDimensionAndGrainSize(int type, int &dim, int &grainSize);

private:
  vtkLICRandomNumberGeneratorInterface ValueGen;
  vtkLICRandomNumberGeneratorInterface ProbGen;
};

#endif
// VTK-HeaderTest-Exclude: vtkLICNoiseHelper.h