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

  Program:   Visualization Toolkit
  Module:    vtkCompositer.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 vtkCompositer - Super class for composite algorthms.
//
// .SECTION Description
// vtkCompositer operates in multiple processes.  Each compositer has 
// a render window.  They use vtkMultiProcessControllers to communicate 
// the color and depth buffer to process 0's render window.
// It will not handle transparency well.
//
// .SECTION See Also
// vtkCompositeManager.

#ifndef __vtkCompositer_h
#define __vtkCompositer_h

#include "vtkObject.h"

class vtkMultiProcessController;
class vtkCompositer;
class vtkDataArray;
class vtkFloatArray;
class vtkUnsignedCharArray;

class VTK_PARALLEL_EXPORT vtkCompositer : public vtkObject
{
public:
  static vtkCompositer *New();
  vtkTypeRevisionMacro(vtkCompositer,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // This method gets called on every process.  The final image gets
  // put into pBuf and zBuf.
  virtual void CompositeBuffer(vtkDataArray *pBuf, vtkFloatArray *zBuf,
                               vtkDataArray *pTmp, vtkFloatArray *zTmp);

  // Description:
  // Access to the controller.
  virtual void SetController(vtkMultiProcessController*);
  vtkGetObjectMacro(Controller,vtkMultiProcessController);

  // Description:
  // A hack to get a sub world until I can get communicators working.
  vtkSetMacro(NumberOfProcesses, int);
  vtkGetMacro(NumberOfProcesses, int);

  // Description:
  // Methods that allocate and delete memory with special MPIPro calls.
  static void DeleteArray(vtkDataArray* da);
  static void ResizeFloatArray(vtkFloatArray* fa, int numComp,
                               vtkIdType size);
  static void ResizeUnsignedCharArray(vtkUnsignedCharArray* uca, 
                                      int numComp, vtkIdType size);
  
protected:
  vtkCompositer();
  ~vtkCompositer();
  
  vtkMultiProcessController *Controller;
  int NumberOfProcesses;

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

#endif
