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

  Program:   Visualization Toolkit
  Module:    TestGPURayCastVolumeScale.cxx

  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.

=========================================================================*/
// This test covers additive method.
// This test volume renders a synthetic dataset with unsigned char values,
// with the additive method.

#include <vtkCamera.h>
#include <vtkColorTransferFunction.h>
#include <vtkDataArray.h>
#include <vtkGPUVolumeRayCastMapper.h>
#include <vtkImageChangeInformation.h>
#include <vtkImageData.h>
#include <vtkImageReader.h>
#include <vtkImageShiftScale.h>
#include <vtkNew.h>
#include <vtkOutlineFilter.h>
#include <vtkPiecewiseFunction.h>
#include <vtkPointData.h>
#include <vtkPolyDataMapper.h>
#include <vtkRegressionTestImage.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkTestUtilities.h>
#include <vtkTimerLog.h>
#include <vtkVolumeProperty.h>
#include <vtkXMLImageDataReader.h>

int TestGPURayCastVolumeScale(int argc, char *argv[])
{
  double scalarRange[2];

  vtkNew<vtkActor> outlineActor;
  vtkNew<vtkPolyDataMapper> outlineMapper;
  vtkNew<vtkGPUVolumeRayCastMapper> volumeMapper;

  vtkNew<vtkXMLImageDataReader> reader;
  const char* volumeFile = vtkTestUtilities::ExpandDataFileName(
                            argc, argv, "Data/vase_1comp.vti");
  reader->SetFileName(volumeFile);

  delete [] volumeFile;

  vtkSmartPointer<vtkImageChangeInformation> changeInformation =
    vtkSmartPointer<vtkImageChangeInformation>::New();
  changeInformation->SetInputConnection(reader->GetOutputPort());
  changeInformation->SetOutputSpacing(1, 2, 3);
  changeInformation->SetOutputOrigin(10, 20, 30);
  changeInformation->Update();
  volumeMapper->SetInputConnection(changeInformation->GetOutputPort());

  // Add outline filter
  vtkNew<vtkOutlineFilter> outlineFilter;
  outlineFilter->SetInputConnection(changeInformation->GetOutputPort());
  outlineMapper->SetInputConnection(outlineFilter->GetOutputPort());
  outlineActor->SetMapper(outlineMapper);

  volumeMapper->GetInput()->GetScalarRange(scalarRange);
  volumeMapper->SetBlendModeToComposite();

  vtkNew<vtkRenderWindow> renWin;
  vtkNew<vtkRenderer> ren;
  renWin->AddRenderer(ren);
  renWin->SetSize(400, 400);
  ren->SetBackground(0.2, 0.2, 0.5);

  vtkNew<vtkRenderWindowInteractor> iren;
  iren->SetRenderWindow(renWin);

  vtkNew<vtkPiecewiseFunction> scalarOpacity;
  scalarOpacity->AddPoint(scalarRange[0], 0.0);
  scalarOpacity->AddPoint(scalarRange[1], 1.0);

  vtkNew<vtkVolumeProperty> volumeProperty;
  volumeProperty->ShadeOff();
  volumeProperty->SetInterpolationType(VTK_LINEAR_INTERPOLATION);

  volumeProperty->SetScalarOpacity(scalarOpacity);

  vtkSmartPointer<vtkColorTransferFunction> colorTransferFunction =
    volumeProperty->GetRGBTransferFunction(0);
  colorTransferFunction->RemoveAllPoints();
  colorTransferFunction->AddRGBPoint(scalarRange[0], 0.0, 0.0, 0.0);
  colorTransferFunction->AddRGBPoint(scalarRange[1], 1.0, 1.0, 1.0);

  vtkNew<vtkVolume> volume;
  volume->SetMapper(volumeMapper);
  volume->SetProperty(volumeProperty);

  ren->AddViewProp(volume);
  ren->AddActor(outlineActor);

  renWin->Render();
  ren->ResetCamera();

  iren->Initialize();

  int retVal = vtkRegressionTestImage( renWin );
  if( retVal == vtkRegressionTester::DO_INTERACTOR)
  {
    iren->Start();
  }

  return !retVal;
}
