vtkRecursiveSphereDirectionEncoder.h

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

  Program:   Visualization Toolkit
  Module:    vtkRecursiveSphereDirectionEncoder.h

  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 vtkRecursiveSphereDirectionEncoder_h
#define vtkRecursiveSphereDirectionEncoder_h

#include "vtkRenderingVolumeModule.h" // For export macro
#include "vtkDirectionEncoder.h"

class VTKRENDERINGVOLUME_EXPORT vtkRecursiveSphereDirectionEncoder : public vtkDirectionEncoder
{
public:
  vtkTypeMacro(vtkRecursiveSphereDirectionEncoder,vtkDirectionEncoder);
  void PrintSelf( ostream& os, vtkIndent indent ) override;

  static vtkRecursiveSphereDirectionEncoder *New();


  int GetEncodedDirection( float n[3] ) override;

  float *GetDecodedGradient( int value ) VTK_SIZEHINT(3) override;

  int GetNumberOfEncodedDirections( void ) override;

  float *GetDecodedGradientTable( void ) override;


  vtkSetClampMacro( RecursionDepth, int, 0, 6 );
  vtkGetMacro( RecursionDepth, int );

protected:
  vtkRecursiveSphereDirectionEncoder();
  ~vtkRecursiveSphereDirectionEncoder() override;

  // How far to recursively divide the sphere
  int                     RecursionDepth;

  // The index table which maps (x,y) position in the rotated grid
  // to an encoded normal
  //int                   IndexTable[2*NORM_SQR_SIZE - 1][2*NORM_SQR_SIZE -1];
  int                     *IndexTable;

  // This is a table that maps encoded normal (2 byte value) to a
  // normal (dx, dy, dz)
  //float                 DecodedNormal[3*(1 + 2*(NORM_SQR_SIZE*NORM_SQR_SIZE+
  //                             (NORM_SQR_SIZE-1)*(NORM_SQR_SIZE-1)))];
  float                   *DecodedNormal;

  // Method to initialize the index table and variable that
  // stored the recursion depth the last time the table was
  // built
  void                  InitializeIndexTable( void );
  int                   IndexTableRecursionDepth;

  int                   OuterSize;
  int                   InnerSize;
  int                   GridSize;
private:
  vtkRecursiveSphereDirectionEncoder(const vtkRecursiveSphereDirectionEncoder&) = delete;
  void operator=(const vtkRecursiveSphereDirectionEncoder&) = delete;
};


#endif