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

  Program:   Visualization Toolkit
  Module:    vtkVPICReader.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.

=========================================================================*/
// .NAME vtkVPICReader - class for reading VPIC data files
// .SECTION Description
// vtkDataReader is a helper superclass that reads the vtk data file header,
// dataset type, and attribute data (point and cell attributes such as
// scalars, vectors, normals, etc.) from a vtk data file.  See text for
// the format of the various vtk file types.
//
// .SECTION See Also
// vtkPolyDataReader vtkStructuredPointsReader vtkStructuredGridReader
// vtkUnstructuredGridReader vtkRectilinearGridReader

#ifndef __vtkVPICReader_h
#define __vtkVPICReader_h

#include "vtkImageAlgorithm.h"


class vtkCallbackCommand;
class vtkDataArraySelection;
class vtkFloatArray;
class vtkStdString;
class vtkMultiProcessController;
class vtkInformation;
//BTX
class VPICDataSet;
class GridExchange;
//ETX
class VTK_PARALLEL_EXPORT vtkVPICReader : public vtkImageAlgorithm
{
public:
  static vtkVPICReader *New();
  vtkTypeMacro(vtkVPICReader,vtkImageAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Specify file name of VPIC data file to read.
  vtkSetStringMacro(FileName);
  vtkGetStringMacro(FileName);

  // Description:
  // Set the stride in each dimension
  vtkSetVector3Macro(Stride, int);
  vtkGetVector3Macro(Stride, int);

  // Description:
  // Set the simulation file decomposition in each dimension
  vtkSetVector2Macro(XExtent, int);
  vtkSetVector2Macro(YExtent, int);
  vtkSetVector2Macro(ZExtent, int);

  // Get the full layout size in files for setting the range in GUI
  vtkGetVector2Macro(XLayout, int);
  vtkGetVector2Macro(YLayout, int);
  vtkGetVector2Macro(ZLayout, int);

  // Description:
  // Get the reader's output
  vtkImageData *GetOutput();
  vtkImageData *GetOutput(int index);

  // Description:
  // The following methods allow selective reading of solutions fields.
  // By default, ALL data fields on the nodes are read, but this can
  // be modified.
  int GetNumberOfPointArrays();
  const char* GetPointArrayName(int index);
  int GetPointArrayStatus(const char* name); 
  void SetPointArrayStatus(const char* name, int status);
  void DisableAllPointArrays();
  void EnableAllPointArrays();

protected:
  vtkVPICReader();
  ~vtkVPICReader();

  char *FileName;                       // First field part file giving path

  int Rank;                             // Number of this processor
  int TotalRank;                        // Number of processors
  int UsedRank;                         // Number of processors used in display

  VPICDataSet* vpicData;                // Data structure controlling access
  GridExchange* exchanger;		// Exchange ghost cells between procs

  int NumberOfPieces;                   // Number of files in dataset
  vtkIdType NumberOfNodes;              // Number of points in grid
  vtkIdType NumberOfCells;              // Number of cells in grid
  vtkIdType NumberOfTuples;             // Number of tuples in sub extent

  int WholeExtent[6];                   // Problem image extent
  int SubExtent[6];                     // Processor problem extent
  int Dimension[3];                     // Size of image
  int SubDimension[3];                  // Size of subextent of image
  int XLayout[2];                       // Extent in complete files
  int YLayout[2];                       // Extent in complete files
  int ZLayout[2];                       // Extent in complete files

  int NumberOfVariables;                // Number of variables to display
  vtkStdString* VariableName;           // Names of each variable
  int* VariableStruct;                  // Scalar, vector or tensor

  int NumberOfTimeSteps;                // Temporal domain
  double* TimeSteps;                    // Times available for request
  int CurrentTimeStep;                  // Time currently displayed

  int Stride[3];                        // Stride over actual data 
  int XExtent[2];                       // Subview extent in files
  int YExtent[2];                       // Subview extent in files
  int ZExtent[2];                       // Subview extent in files

  vtkFloatArray** data;                 // Actual data arrays
  int* dataLoaded;                      // Data is loaded for current time

  int Start[3];                         // Start offset for processor w ghosts
  int GhostDimension[3];                // Dimension including ghosts on proc
  int NumberOfGhostTuples;              // Total ghost cells per component
  int ghostLevel0;                      // Left plane number of ghosts
  int ghostLevel1;                      // Right plane number of ghosts

  // Controlls initializing and querrying MPI
  vtkMultiProcessController * MPIController; 

  // Selected field of interest
  vtkDataArraySelection* PointDataArraySelection;

  // Observer to modify this object when array selections are modified
  vtkCallbackCommand* SelectionObserver;

  int RequestData(vtkInformation *, vtkInformationVector **,
                  vtkInformationVector *);
  int RequestInformation(vtkInformation *, vtkInformationVector **inVector,
                         vtkInformationVector *);

  void LoadVariableData(int var, int timeStep);
  void LoadComponent(
        float* varData,
        float* block,
        int comp,
        int numberOfComponents);

  static void SelectionCallback(vtkObject* caller, unsigned long eid,
                                void* clientdata, void* calldata);
  static void EventCallback(vtkObject* caller, unsigned long eid,
                                void* clientdata, void* calldata);


private:
  vtkVPICReader(const vtkVPICReader&);  // Not implemented.
  void operator=(const vtkVPICReader&); // Not implemented.
};

#endif