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

  Program:   Visualization Toolkit
  Module:    TestBlurAndSobelPasses.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 the combination of two post-processing render passes:
// Gaussian blur first, followed by a Sobel detection. It renders of an
// opaque cone.
//
// The command line arguments are:
// -I        => run in interactive mode; unless this is used, the program will
//              not allow interaction and exit

#include "vtkTestUtilities.h"
#include "vtkRegressionTestImage.h"

#include "vtkRenderWindowInteractor.h"
#include "vtkRenderWindow.h"
#include "vtkOpenGLRenderer.h"
#include "vtkActor.h"

#include "vtkImageSinusoidSource.h"
#include "vtkImageData.h"
#include "vtkImageDataGeometryFilter.h"
#include "vtkDataSetSurfaceFilter.h"
#include "vtkPolyDataMapper.h"
#include "vtkLookupTable.h"
#include "vtkCamera.h"

#include "vtkCameraPass.h"
#include "vtkLightsPass.h"
#include "vtkSequencePass.h"
#include "vtkOpaquePass.h"
//#include "vtkDepthPeelingPass.h"
#include "vtkTranslucentPass.h"
#include "vtkVolumetricPass.h"
#include "vtkOverlayPass.h"
#include "vtkRenderPassCollection.h"
#include "vtkGaussianBlurPass.h"
#include "vtkSobelGradientMagnitudePass.h"
#include "vtkConeSource.h"

int TestBlurAndSobelPasses(int argc, char* argv[])
{
  vtkRenderWindowInteractor *iren=vtkRenderWindowInteractor::New();
  vtkRenderWindow *renWin = vtkRenderWindow::New();
  renWin->SetMultiSamples(0);

  renWin->SetAlphaBitPlanes(1);
  iren->SetRenderWindow(renWin);
  renWin->Delete();

  vtkRenderer *renderer = vtkRenderer::New();
  renWin->AddRenderer(renderer);
  renderer->Delete();

  vtkOpenGLRenderer *glrenderer = vtkOpenGLRenderer::SafeDownCast(renderer);

  vtkCameraPass *cameraP=vtkCameraPass::New();

  vtkSequencePass *seq=vtkSequencePass::New();
  vtkOpaquePass *opaque=vtkOpaquePass::New();
//  vtkDepthPeelingPass *peeling=vtkDepthPeelingPass::New();
//  peeling->SetMaximumNumberOfPeels(200);
//  peeling->SetOcclusionRatio(0.1);

  vtkTranslucentPass *translucent=vtkTranslucentPass::New();
//  peeling->SetTranslucentPass(translucent);

  vtkVolumetricPass *volume=vtkVolumetricPass::New();
  vtkOverlayPass *overlay=vtkOverlayPass::New();

  vtkLightsPass *lights=vtkLightsPass::New();

  vtkRenderPassCollection *passes=vtkRenderPassCollection::New();
  passes->AddItem(lights);
  passes->AddItem(opaque);

//  passes->AddItem(peeling);
  passes->AddItem(translucent);

  passes->AddItem(volume);
  passes->AddItem(overlay);
  seq->SetPasses(passes);
  cameraP->SetDelegatePass(seq);


  vtkGaussianBlurPass *blurP=vtkGaussianBlurPass::New();
  blurP->SetDelegatePass(cameraP);


  vtkSobelGradientMagnitudePass *sobelP=vtkSobelGradientMagnitudePass::New();
  sobelP->SetDelegatePass(blurP);

  glrenderer->SetPass(sobelP);

//  renderer->SetPass(cameraP);

  opaque->Delete();
//  peeling->Delete();
  translucent->Delete();
  volume->Delete();
  overlay->Delete();
  seq->Delete();
  passes->Delete();
  cameraP->Delete();
  blurP->Delete();
  sobelP->Delete();
  lights->Delete();

  vtkImageSinusoidSource *imageSource=vtkImageSinusoidSource::New();
  imageSource->SetWholeExtent(0,9,0,9,0,9);
  imageSource->SetPeriod(5);
  imageSource->Update();

  vtkImageData *image=imageSource->GetOutput();
  double range[2];
  image->GetScalarRange(range);

  vtkDataSetSurfaceFilter *surface=vtkDataSetSurfaceFilter::New();

  surface->SetInputConnection(imageSource->GetOutputPort());
  imageSource->Delete();

  vtkPolyDataMapper *mapper=vtkPolyDataMapper::New();
  mapper->SetInputConnection(surface->GetOutputPort());
  surface->Delete();

  vtkLookupTable *lut=vtkLookupTable::New();
  lut->SetTableRange(range);
  lut->SetAlphaRange(0.5,0.5);
  lut->SetHueRange(0.2,0.7);
  lut->SetNumberOfTableValues(256);
  lut->Build();

  mapper->SetScalarVisibility(1);
  mapper->SetLookupTable(lut);
  lut->Delete();

  vtkActor *actor=vtkActor::New();
  renderer->AddActor(actor);
  actor->Delete();
  actor->SetMapper(mapper);
  mapper->Delete();
  actor->SetVisibility(0);

  vtkConeSource *cone=vtkConeSource::New();
  vtkPolyDataMapper *coneMapper=vtkPolyDataMapper::New();
  coneMapper->SetInputConnection(cone->GetOutputPort());
  coneMapper->SetImmediateModeRendering(1);
  cone->Delete();
  vtkActor *coneActor=vtkActor::New();
  coneActor->SetMapper(coneMapper);
  coneActor->SetVisibility(1);
  coneMapper->Delete();
  renderer->AddActor(coneActor);
  coneActor->Delete();

  renderer->SetBackground(0.1,0.3,0.0);
  renWin->SetSize(400,400);

  renWin->Render();
  // if(peeling->GetLastRenderingUsedDepthPeeling())
  //   {
  //   cout<<"depth peeling was used"<<endl;
  //   }
  // else
  //   {
  //   cout<<"depth peeling was not used (alpha blending instead)"<<endl;
  //   }
  vtkCamera *camera=renderer->GetActiveCamera();
  camera->Azimuth(-40.0);
  camera->Elevation(20.0);
  renWin->Render();

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

  return !retVal;
}
