vtkLICNoiseHelper.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef vtkLICNoiseHelper_h
#define vtkLICNoiseHelper_h
 
#include "vtkRenderingLICOpenGL2Module.h" // for export
 
#include "vtkMinimalStandardRandomSequence.h"
 
VTK_ABI_NAMESPACE_BEGIN
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&) = delete;
  vtkLICRandomNumberGeneratorInterface(const vtkLICRandomNumberGeneratorInterface&) = delete;
 
  vtkMinimalStandardRandomSequence* RNG;
};

class vtkLICRandomNoise2D
{
public:
  vtkLICRandomNoise2D() = default;


  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);
 
  vtkLICRandomNumberGeneratorInterface ValueGen;
  vtkLICRandomNumberGeneratorInterface ProbGen;
};
 
VTK_ABI_NAMESPACE_END
#endif
// VTK-HeaderTest-Exclude: vtkLICNoiseHelper.h