// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
// This test covers offscreen rendering.
//
// The command line arguments are:
// -I        => run in interactive mode; unless this is used, the program will
//              not allow interaction and exit

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

#include "vtkActor.h"
#include "vtkConeSource.h"
#include "vtkPolyDataMapper.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"

int TestOnAndOffScreenConeCxx(int argc, char* argv[])
{
  vtkRenderWindow* renWin = vtkRenderWindow::New();
  // renWin->SetShowWindow(false);
  // renWin->OffScreenRenderingOn();
  renWin->SetMultiSamples(0);

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

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

  vtkActor* actor = vtkActor::New();
  actor->SetMapper(mapper);
  mapper->Delete();

  renderer->AddActor(actor);
  actor->Delete();

  renderer->SetBackground(0.2, 0.3, 0.4);
  renWin->Render();
  renWin->SetShowWindow(false);
  renWin->SetUseOffScreenBuffers(true);
  renderer->SetBackground(0, 0, 0);

  renWin->Render();
  renWin->Render();
  renWin->Render();
  renWin->Render();

#if 0
  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
  iren->SetRenderWindow(renWin);
  renWin->Delete();

  renWin->Render();

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

  // Cleanup
  iren->Delete();
#else // the interactor version fails with OSMesa.
  renWin->Render();
  int retVal = vtkRegressionTestImage(renWin);
  renWin->Delete();
#endif
  return !retVal;
}