// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
// 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 <vtkImageData.h>
#include <vtkImageReader.h>
#include <vtkImageShiftScale.h>
#include <vtkLightKit.h>
#include <vtkNew.h>
#include <vtkOSPRayPass.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 <vtkStructuredPointsReader.h>
#include <vtkTestUtilities.h>
#include <vtkTimerLog.h>
#include <vtkVolumeProperty.h>
#include <vtkXMLImageDataReader.h>

int TestGPURayCastVolumeLightKit(int argc, char* argv[])
{
  bool useOSP = true;
  for (int i = 0; i < argc; i++)
  {
    if (!strcmp(argv[i], "-GL"))
    {
      cerr << "GL" << endl;
      useOSP = false;
    }
  }

  double scalarRange[2];

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

  volumeMapper->GetInput()->GetScalarRange(scalarRange);
  volumeMapper->SetBlendModeToComposite();
  volumeMapper->SetAutoAdjustSampleDistances(0);
  volumeMapper->SetSampleDistance(0.1);

  vtkNew<vtkLightKit> lightKit;
  vtkNew<vtkRenderWindow> renWin;
  vtkNew<vtkRenderer> ren;
  ren->SetBackground(0.0, 0.0, 0.0);
  ren->SetTwoSidedLighting(0);

  lightKit->SetKeyLightWarmth(1.0);
  lightKit->SetFillLightWarmth(0.0);
  lightKit->SetBackLightWarmth(0.0);
  lightKit->AddLightsToRenderer(ren);

  renWin->AddRenderer(ren);
  renWin->SetSize(400, 400);

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

  vtkNew<vtkPiecewiseFunction> scalarOpacity;
  scalarOpacity->AddPoint(55, 0.0);
  scalarOpacity->AddPoint(65, 1.0);

  vtkNew<vtkVolumeProperty> volumeProperty;
  volumeProperty->SetAmbient(0.0);
  volumeProperty->SetDiffuse(1.0);
  volumeProperty->SetSpecular(0.0);
  volumeProperty->SetInterpolationType(VTK_LINEAR_INTERPOLATION);
  volumeProperty->SetScalarOpacity(scalarOpacity);

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

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

  // Attach OSPRay render pass
  vtkNew<vtkOSPRayPass> osprayPass;
  if (useOSP)
  {
    ren->SetPass(osprayPass);
  }

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

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

  return !retVal;
}
