/*=========================================================================                                                                               
  Program:   bbtk
  Module:    $RCSfile: bbvtkVolumeRenderer.cxx,v $
  Language:  C++
  Date:      $Date: 2008/12/16 12:48:10 $
  Version:   $Revision: 1.1 $
=========================================================================*/

/* ---------------------------------------------------------------------

* Copyright (c) CREATIS-LRMN (Centre de Recherche en Imagerie Medicale)
* Authors : Eduardo Davila, Laurent Guigues, Jean-Pierre Roux
*
*  This software is governed by the CeCILL-B license under French law and 
*  abiding by the rules of distribution of free software. You can  use, 
*  modify and/ or redistribute the software under the terms of the CeCILL-B 
*  license as circulated by CEA, CNRS and INRIA at the following URL 
*  http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.html 
*  or in the file LICENSE.txt.
*
*  As a counterpart to the access to the source code and  rights to copy,
*  modify and redistribute granted by the license, users are provided only
*  with a limited warranty  and the software's author,  the holder of the
*  economic rights,  and the successive licensors  have only  limited
*  liability. 
*
*  The fact that you are presently reading this means that you have had
*  knowledge of the CeCILL-B license and that you accept its terms.
* ------------------------------------------------------------------------ */                                                                         

/**
 *  \file 
 *  \brief 
 */



#ifdef _USE_VTK_


#include "bbvtkVolumeRenderer.h"
#include "bbvtkPackage.h"

namespace bbvtk
{


   BBTK_ADD_BLACK_BOX_TO_PACKAGE(vtk,VolumeRenderer)
   BBTK_BLACK_BOX_IMPLEMENTATION(VolumeRenderer,bbtk::AtomicBlackBox);





   void VolumeRenderer::bbUserConstructor() 
   { 
     Init();
     bbSetInputColorFunction(0);
     bbSetInputOpacityFunction(0);
   }
   void VolumeRenderer::bbUserCopyConstructor(bbtk::BlackBox::Pointer) 
   { 
     Init();
   }

   void VolumeRenderer::Init() 
   { 

    // Create the pipeline
     //    mCast = vtkImageShiftScale::New();
     //    mCast->SetOutputScalarTypeToUnsignedChar();
     //    mCast->ClampOverflowOn();
    
    //    mMIP = vtkVolumeRayCastMIPFunction::New();
    //    mMIP->SetMaximizeMethodToScalarValue();

    mRayCastFunction = vtkVolumeRayCastCompositeFunction::New();
    
    mMapper = vtkVolumeRayCastMapper::New();
    mMapper->SetVolumeRayCastFunction(mRayCastFunction);

    
    mVolume = vtkVolume::New();
    mVolume->SetMapper(mMapper);

    //  mMapper->ScalarVisibilityOff();
    //    mMapper->ImmediateModeRenderingOn();

    bbSetOutputOut(mVolume);
}

   void VolumeRenderer::bbUserDestructor() 
   { 
     mRayCastFunction->Delete();
     mMapper->Delete();
     mVolume->Delete();

   }
//---------------------------------------------------------------------

   void VolumeRenderer::Process()
   {
     bool changed = false;
     if ( bbGetInputStatus("In") != bbtk::UPTODATE )
       {
	 mMapper->SetInput( bbGetInputIn() );
	 changed = true;
       }
     if ( ( bbGetInputStatus("ColorFunction") != bbtk::UPTODATE ) &&
	  ( bbGetInputColorFunction() != 0 ) )
       {
	 mVolume->GetProperty()->SetColor( bbGetInputColorFunction() );
	 changed = true;
       }
     if ( ( bbGetInputStatus("OpacityFunction") != bbtk::UPTODATE ) &&
	  ( bbGetInputOpacityFunction() != 0 ) )
       {
	 mVolume->GetProperty()->SetScalarOpacity(bbGetInputOpacityFunction());
	 changed = true;
       }
    
     if (changed) mMapper->Update();
     
   }

}//namespace bbtk

#endif // _USE_VTK_