vtkRecursiveSphereDirectionEncoder.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause

 
#ifndef vtkRecursiveSphereDirectionEncoder_h
#define vtkRecursiveSphereDirectionEncoder_h
 
#include "vtkDirectionEncoder.h"
#include "vtkRenderingVolumeModule.h" // For export macro
 
VTK_ABI_NAMESPACE_BEGIN
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() override;

  float* GetDecodedGradientTable() 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();
  int IndexTableRecursionDepth;
 
  int OuterSize;
  int InnerSize;
  int GridSize;
 
private:
  vtkRecursiveSphereDirectionEncoder(const vtkRecursiveSphereDirectionEncoder&) = delete;
  void operator=(const vtkRecursiveSphereDirectionEncoder&) = delete;
};
 
VTK_ABI_NAMESPACE_END
#endif