Rendering/vtkEncodedGradientShader.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkEncodedGradientShader.h,v $
  Language:  C++

  Copyright (c) 1993-2002 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 "vtkObject.h"

class vtkVolume;
class vtkRenderer;
class vtkEncodedGradientEstimator;

#define VTK_MAX_SHADING_TABLES   100

class VTK_RENDERING_EXPORT vtkEncodedGradientShader : public vtkObject
{
public:
  static vtkEncodedGradientShader *New();
  vtkTypeRevisionMacro(vtkEncodedGradientShader,vtkObject);

  void PrintSelf( ostream& os, vtkIndent indent );


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

protected:
  vtkEncodedGradientShader();
  ~vtkEncodedGradientShader();


  void  BuildShadingTable( int index,
                           float lightDirection[3],
                           float lightColor[3],
                           float lightIntensity,
                           float viewDirection[3],
                           float 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];

  // 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&);  // Not implemented.
  void operator=(const vtkEncodedGradientShader&);  // Not implemented.
}; 


#endif

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