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

  Program:   Visualization Toolkit
  Module:    vtkUncertaintySurfacePainter.h

  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.

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

#ifndef vtkUncertaintySurfacePainter_h
#define vtkUncertaintySurfacePainter_h

#include "vtkPainter.h"
#include "vtkSmartPointer.h"
#include "vtkWeakPointer.h"
#include "vtkLightingHelper.h"
#include "vtkOpenGLRenderWindow.h"
#include "vtkShaderProgram2.h"
#include "vtkPiecewiseFunction.h"

class VTK_EXPORT vtkUncertaintySurfacePainter : public vtkPainter
{
public:
  static vtkUncertaintySurfacePainter* New();
  vtkTypeMacro(vtkUncertaintySurfacePainter, vtkPainter)
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Release any graphics resources that are being consumed by this mapper.
  void ReleaseGraphicsResources(vtkWindow *window);

  // Description:
  // Process information values.
  void ProcessInformation(vtkInformation* info);

  // Description:
  // Get the output data object from this painter.
  vtkDataObject* GetOutput();

  // Description:
  // Enable/Disable this painter.
  vtkSetMacro(Enabled, int)
  vtkGetMacro(Enabled, int)
  vtkBooleanMacro(Enabled, int)

  // Description:
  // Set/get the uncertainty array name.
  vtkGetStringMacro(UncertaintyArrayName)
  vtkSetStringMacro(UncertaintyArrayName)

  // Description:
  // Set/get the uncertainty transfer function.
  vtkGetObjectMacro(TransferFunction, vtkPiecewiseFunction)
  vtkSetObjectMacro(TransferFunction, vtkPiecewiseFunction)

  // Description:
  // Set/get the uncertainty scale factor.
  vtkSetClampMacro(UncertaintyScaleFactor, float, 0.0f, 50.0f)
  vtkGetMacro(UncertaintyScaleFactor, float)

  // Description:
  // Set/get the scalar value range of the array used for coloring.
  vtkSetMacro(ScalarValueRange, float)
  vtkGetMacro(ScalarValueRange, float)

protected:
  vtkUncertaintySurfacePainter();
  ~vtkUncertaintySurfacePainter();

  // Description:
  // Prepare to render.
  void PrepareForRendering(vtkRenderer *renderer,
                           vtkActor *actor);

  // Description:
  // Performs the actual rendering.
  void RenderInternal(vtkRenderer *renderer,
                      vtkActor *actor,
                      unsigned long typeFlags,
                      bool forceCompileOnly);

  // Description:
  // Passes information.
  void PassInformation(vtkPainter* toPainter);

  // Description:
  // Prepares the output data object.
  bool PrepareOutput();

  // Description:
  // Add the uncertainties array to the output.
  void GenerateUncertaintiesArray(vtkDataObject *input, vtkDataObject *output);

private:
  int Enabled;
  vtkDataObject *Output;
  vtkSmartPointer<vtkShaderProgram2> Shader;
  vtkWeakPointer<vtkOpenGLRenderWindow> LastRenderWindow;
  vtkSmartPointer<vtkLightingHelper> LightingHelper;
  vtkPiecewiseFunction *TransferFunction;
  char *UncertaintyArrayName;
  int RenderingPreparationSuccess;
  float UncertaintyScaleFactor;
  float ScalarValueRange;
  GLuint PermTextureId;
  GLuint SimplexTextureId;
  GLuint GradTextureId;
};

#endif // vtkUncertaintySurfacePainter_h