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vtkUniformGridPartitioner.cxx
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vtkUniformGridPartitioner.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkUniformGridPartitioner.cxx
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.
=========================================================================*/
#include "vtkUniformGridPartitioner.h"
#include "vtkExtentRCBPartitioner.h"
#include "vtkIndent.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMultiBlockDataSet.h"
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkStructuredData.h"
#include "vtkStructuredExtent.h"
#include "vtkUniformGrid.h"
#include <cassert>
vtkStandardNewMacro(vtkUniformGridPartitioner);
//------------------------------------------------------------------------------
vtkUniformGridPartitioner::vtkUniformGridPartitioner()
{
this->NumberOfPartitions = 2;
this->NumberOfGhostLayers = 0;
this->DuplicateNodes = 1;
}
//------------------------------------------------------------------------------
vtkUniformGridPartitioner::~vtkUniformGridPartitioner() = default;
//------------------------------------------------------------------------------
void vtkUniformGridPartitioner::PrintSelf(std::ostream& oss, vtkIndent indent)
{
this->Superclass::PrintSelf(oss, indent);
oss << "NumberOfPartitions: " << this->NumberOfPartitions << std::endl;
oss << "NumberOfGhostLayers: " << this->NumberOfGhostLayers << std::endl;
oss << "DuplicateNodes: " << this->DuplicateNodes << std::endl;
}
//------------------------------------------------------------------------------
int vtkUniformGridPartitioner::FillInputPortInformation(int vtkNotUsed(port), vtkInformation* info)
{
info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkImageData");
return 1;
}
//------------------------------------------------------------------------------
int vtkUniformGridPartitioner::FillOutputPortInformation(int vtkNotUsed(port), vtkInformation* info)
{
info->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkMultiBlockDataSet");
return 1;
}
//------------------------------------------------------------------------------
int vtkUniformGridPartitioner::RequestData(vtkInformation* vtkNotUsed(request),
vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
// STEP 0: Get input object
vtkInformation* input = inputVector[0]->GetInformationObject(0);
assert("pre: input information object is nullptr" && (input != nullptr));
vtkImageData* grd = vtkImageData::SafeDownCast(input->Get(vtkDataObject::DATA_OBJECT()));
assert("pre: input grid is nullptr!" && (grd != nullptr));
// STEP 1: Get output object
vtkInformation* output = outputVector->GetInformationObject(0);
assert("pre: output information object is nullptr" && (output != nullptr));
vtkMultiBlockDataSet* multiblock =
vtkMultiBlockDataSet::SafeDownCast(output->Get(vtkDataObject::DATA_OBJECT()));
assert("pre: multiblock grid is nullptr!" && (multiblock != nullptr));
// STEP 2: Get the global extent
int extent[6];
int dims[3];
grd->GetDimensions(dims);
grd->GetExtent(extent);
// STEP 3: Setup extent partitioner
vtkExtentRCBPartitioner* extentPartitioner = vtkExtentRCBPartitioner::New();
assert("pre: extent partitioner is nullptr" && (extentPartitioner != nullptr));
extentPartitioner->SetGlobalExtent(extent);
extentPartitioner->SetNumberOfPartitions(this->NumberOfPartitions);
extentPartitioner->SetNumberOfGhostLayers(this->NumberOfGhostLayers);
if (this->DuplicateNodes == 1)
{
extentPartitioner->DuplicateNodesOn();
}
else
{
extentPartitioner->DuplicateNodesOff();
}
// STEP 4: Partition
extentPartitioner->Partition();
// STEP 5: Extract partitions into a multi-block dataset.
multiblock->SetNumberOfBlocks(extentPartitioner->GetNumExtents());
// Set the whole extent of the grid
multiblock->GetInformation()->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(), extent, 6);
unsigned int blockIdx = 0;
for (; blockIdx < multiblock->GetNumberOfBlocks(); ++blockIdx)
{
int ext[6];
extentPartitioner->GetPartitionExtent(blockIdx, ext);
double origin[3];
int ijk[3];
ijk[0] = ext[0];
ijk[1] = ext[2];
ijk[2] = ext[4];
int subdims[3];
vtkStructuredExtent::GetDimensions(ext, subdims);
vtkIdType pntIdx = vtkStructuredData::ComputePointId(dims, ijk);
grd->GetPoint(pntIdx, origin);
vtkUniformGrid* subgrid = vtkUniformGrid::New();
subgrid->SetOrigin(origin);
subgrid->SetSpacing(grd->GetSpacing());
subgrid->SetDimensions(subdims);
// Set the global extent for each block
vtkInformation* metadata = multiblock->GetMetaData(blockIdx);
assert("pre: metadata is nullptr" && (metadata != nullptr));
metadata->Set(vtkDataObject::PIECE_EXTENT(), ext, 6);
multiblock->SetBlock(blockIdx, subgrid);
subgrid->Delete();
} // END for all blocks
extentPartitioner->Delete();
return 1;
}