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

  Program:   Visualization Toolkit
  Module:    vtkProgrammableFilter.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

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   this list of conditions and the following disclaimer.

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 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

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   misrepresented as being the original software.

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ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
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=========================================================================*/
// .NAME vtkProgrammableFilter - a user-programmable filter
// .SECTION Description
// vtkProgrammableFilter is a filter that can be programmed by the user.  To
// use the filter you define a function that retrieves input of the correct
// type, creates data, and then manipulates the output of the filter.  Using
// this filter avoids the need for subclassing - and the function can be
// defined in an interpreter wrapper language such as Tcl or Java.
//
// The trickiest part of using this filter is that the input and output
// methods are unusual and cannot be compile-time type checked. Instead, as a
// user of this filter it is your responsibility to set and get the correct
// input and output types.

// .SECTION Caveats
// The filter correctlymanages modified time and network execution in most
// cases. However, if you change the definition of the filter function,
// you'll want to send a manual Modified() method to the filter to force it
// to reexecute.

// .SECTION See Also
// vtkProgrammablePointDataFilter vtkProgrammableSource

#ifndef __vtkProgrammableFilter_h
#define __vtkProgrammableFilter_h

#include "vtkDataSetToDataSetFilter.h"

class VTK_EXPORT vtkProgrammableFilter : public vtkDataSetToDataSetFilter
{
public:
  static vtkProgrammableFilter *New();
  vtkTypeMacro(vtkProgrammableFilter,vtkDataSetToDataSetFilter);

  // Description:
  // Specify the function to use to operate on the point attribute data. Note
  // that the function takes a single (void *) argument.
  void SetExecuteMethod(void (*f)(void *), void *arg);

  // Description:
  // Set the arg delete method. This is used to free user memory.
  void SetExecuteMethodArgDelete(void (*f)(void *));

  // Description:
  // Get the input as a concrete type. This method is typically used by the
  // writer of the filter function to get the input as a particular type (i.e.,
  // it essentially does type casting). It is the users responsibility to know
  // the correct type of the input data.
  vtkPolyData *GetPolyDataInput();

  // Description:
  // Get the input as a concrete type.
  vtkStructuredPoints *GetStructuredPointsInput();

  // Description:
  // Get the input as a concrete type.
  vtkStructuredGrid *GetStructuredGridInput();

  // Description:
  // Get the input as a concrete type.
  vtkUnstructuredGrid *GetUnstructuredGridInput();

  // Description:
  // Get the input as a concrete type.
  vtkRectilinearGrid *GetRectilinearGridInput();

protected:
  vtkProgrammableFilter();
  ~vtkProgrammableFilter();
  vtkProgrammableFilter(const vtkProgrammableFilter&) {};
  void operator=(const vtkProgrammableFilter&) {};

  void Execute();

  void (*ExecuteMethod)(void *); //function to invoke
  void (*ExecuteMethodArgDelete)(void *);
  void *ExecuteMethodArg;
  
};

#endif

