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/*=========================================================================
Program: Visualization Toolkit
Module: vtkMPIPixelView.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 vtkMPIPixelView -- Templated helper function for creating
// MPI datatypes that describe a vtkPixelExtent.
#ifndef vtkMPIPixelView_h
#define vtkMPIPixelView_h
#include "vtkPixelExtent.h" // for pixel extent
#include "vtkMPI.h" // for mpi
#include "vtkMPIPixelTT.h" // for type traits
#include <iostream> // for cerr
//-----------------------------------------------------------------------------
template<typename T>
int vtkMPIPixelViewNew(
const vtkPixelExtent &domain,
const vtkPixelExtent &decomp,
int nComps,
MPI_Datatype &view)
{
#ifndef NDEBUG
int mpiOk=0;
MPI_Initialized(&mpiOk);
if (!mpiOk)
{
std::cerr << "This class requires the MPI runtime." << std::endl;
return -1;
}
#endif
int iErr;
MPI_Datatype nativeType;
iErr=MPI_Type_contiguous(
nComps,
vtkMPIPixelTT<T>::MPIType,
&nativeType);
if (iErr)
{
return -2;
}
int domainDims[2];
domain.Size(domainDims);
int domainStart[2];
domain.GetStartIndex(domainStart);
int decompDims[2];
decomp.Size(decompDims);
int decompStart[2];
decomp.GetStartIndex(decompStart, domainStart);
// use a contiguous type when possible.
if (domain==decomp)
{
unsigned long long nCells=decomp.Size();
iErr=MPI_Type_contiguous((int)nCells, nativeType, &view);
if (iErr)
{
MPI_Type_free(&nativeType);
return -3;
}
}
else
{
iErr=MPI_Type_create_subarray(
2,
domainDims,
decompDims,
decompStart,
MPI_ORDER_FORTRAN,
nativeType,
&view);
if (iErr)
{
MPI_Type_free(&nativeType);
return -4;
}
}
iErr=MPI_Type_commit(&view);
if (iErr)
{
MPI_Type_free(&nativeType);
return -5;
}
MPI_Type_free(&nativeType);
return 0;
}
#endif
// VTK-HeaderTest-Exclude: vtkMPIPixelView.h
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