vtkEncodedGradientShader.h

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

  Program:   Visualization Toolkit
  Module:    vtkEncodedGradientShader.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 vtkEncodedGradientShader_h
#define vtkEncodedGradientShader_h

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

class vtkVolume;
class vtkRenderer;
class vtkEncodedGradientEstimator;

#define VTK_MAX_SHADING_TABLES   100

class VTKRENDERINGVOLUME_EXPORT vtkEncodedGradientShader : public vtkObject
{
public:
  static vtkEncodedGradientShader *New();
  vtkTypeMacro(vtkEncodedGradientShader,vtkObject);

  void PrintSelf( ostream& os, vtkIndent indent ) override;


  vtkSetClampMacro( ZeroNormalDiffuseIntensity,  float, 0.0f, 1.0f);
  vtkGetMacro( ZeroNormalDiffuseIntensity, float );
  vtkSetClampMacro( ZeroNormalSpecularIntensity, float, 0.0f, 1.0f);
  vtkGetMacro( ZeroNormalSpecularIntensity, float );

  void UpdateShadingTable( vtkRenderer *ren, vtkVolume *vol,
                           vtkEncodedGradientEstimator *gradest);


  float *GetRedDiffuseShadingTable(    vtkVolume *vol );
  float *GetGreenDiffuseShadingTable(  vtkVolume *vol );
  float *GetBlueDiffuseShadingTable(   vtkVolume *vol );
  float *GetRedSpecularShadingTable(   vtkVolume *vol );
  float *GetGreenSpecularShadingTable( vtkVolume *vol );
  float *GetBlueSpecularShadingTable(  vtkVolume *vol );


  vtkSetClampMacro( ActiveComponent, int, 0, 3 );
  vtkGetMacro( ActiveComponent, int );

protected:
  vtkEncodedGradientShader();
  ~vtkEncodedGradientShader() override;

  void  BuildShadingTable( int index,
                           double lightDirection[3],
                           double lightAmbientColor[3],
                           double lightDiffuseColor[3],
                           double lightSpecularColor[3],
                           double lightIntensity,
                           double viewDirection[3],
                           double material[4],
                           int twoSided,
                           vtkEncodedGradientEstimator *gradest,
                           int updateFlag );

  // The six shading tables (r diffuse ,g diffuse ,b diffuse,
  // r specular, g specular, b specular ) - with an entry for each
  // encoded normal plus one entry at the end for the zero normal
  // There is one shading table per volume listed in the ShadingTableVolume
  // array. A null entry indicates an available slot.
  float                        *ShadingTable[VTK_MAX_SHADING_TABLES][6];
  vtkVolume                    *ShadingTableVolume[VTK_MAX_SHADING_TABLES];
  int                          ShadingTableSize[VTK_MAX_SHADING_TABLES];

  int                          ActiveComponent;

  // The intensity of light used for the zero normals, since it
  // can not be computed from the normal angles. Defaults to 0.0.
  float    ZeroNormalDiffuseIntensity;
  float    ZeroNormalSpecularIntensity;
private:
  vtkEncodedGradientShader(const vtkEncodedGradientShader&) = delete;
  void operator=(const vtkEncodedGradientShader&) = delete;
};


#endif