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// SPDX-FileCopyrightText: Copyright (c) Kitware Inc.
// SPDX-License-Identifier: BSD-3-Clause
#include "FEAdaptor.h"
#include "FEDataStructures.h"
#include <iostream>
#include <vtkCPDataDescription.h>
#include <vtkCPInputDataDescription.h>
#include <vtkCPProcessor.h>
#include <vtkCPPythonPipeline.h>
#include <vtkCellData.h>
#include <vtkCellType.h>
#include <vtkDoubleArray.h>
#include <vtkFloatArray.h>
#include <vtkLogger.h>
#include <vtkNew.h>
#include <vtkPointData.h>
#include <vtkPoints.h>
#include <vtkUnstructuredGrid.h>
namespace
{
vtkCPProcessor* Processor = nullptr;
vtkUnstructuredGrid* VTKGrid;
void BuildVTKGrid(Grid& grid)
{
// create the points information
vtkNew<vtkDoubleArray> pointArray;
pointArray->SetNumberOfComponents(3);
pointArray->SetArray(
grid.GetPointsArray(), static_cast<vtkIdType>(grid.GetNumberOfPoints() * 3), 1);
vtkNew<vtkPoints> points;
points->SetData(pointArray);
VTKGrid->SetPoints(points);
// create the cells
size_t numCells = grid.GetNumberOfCells();
VTKGrid->Allocate(static_cast<vtkIdType>(numCells * 9));
for (size_t cell = 0; cell < numCells; cell++)
{
unsigned int* cellPoints = grid.GetCellPoints(cell);
vtkIdType tmp[8] = { cellPoints[0], cellPoints[1], cellPoints[2], cellPoints[3], cellPoints[4],
cellPoints[5], cellPoints[6], cellPoints[7] };
VTKGrid->InsertNextCell(VTK_HEXAHEDRON, 8, tmp);
}
}
void UpdateVTKAttributes(Grid& grid, Attributes& attributes, vtkCPInputDataDescription* idd)
{
if (idd->IsFieldNeeded("velocity", vtkDataObject::POINT) == true)
{
if (VTKGrid->GetPointData()->GetNumberOfArrays() == 0)
{
// velocity array
vtkNew<vtkDoubleArray> velocity;
velocity->SetName("velocity");
velocity->SetNumberOfComponents(3);
velocity->SetNumberOfTuples(static_cast<vtkIdType>(grid.GetNumberOfPoints()));
VTKGrid->GetPointData()->AddArray(velocity);
}
vtkDoubleArray* velocity =
vtkDoubleArray::SafeDownCast(VTKGrid->GetPointData()->GetArray("velocity"));
// The velocity array is ordered as vx0,vx1,vx2,..,vy0,vy1,vy2,..,vz0,vz1,vz2,..
// so we need to create a full copy of it with VTK's ordering of
// vx0,vy0,vz0,vx1,vy1,vz1,..
double* velocityData = attributes.GetVelocityArray();
vtkIdType numTuples = velocity->GetNumberOfTuples();
for (vtkIdType i = 0; i < numTuples; i++)
{
double values[3] = { velocityData[i], velocityData[i + numTuples],
velocityData[i + 2 * numTuples] };
velocity->SetTypedTuple(i, values);
}
}
if (idd->IsFieldNeeded("pressure", vtkDataObject::CELL) == true)
{
if (VTKGrid->GetCellData()->GetNumberOfArrays() == 0)
{
// pressure array
vtkNew<vtkFloatArray> pressure;
pressure->SetName("pressure");
pressure->SetNumberOfComponents(1);
VTKGrid->GetCellData()->AddArray(pressure);
}
vtkFloatArray* pressure =
vtkFloatArray::SafeDownCast(VTKGrid->GetCellData()->GetArray("pressure"));
// The pressure array is a scalar array so we can reuse
// memory as long as we ordered the points properly.
float* pressureData = attributes.GetPressureArray();
pressure->SetArray(pressureData, static_cast<vtkIdType>(grid.GetNumberOfCells()), 1);
}
}
void BuildVTKDataStructures(Grid& grid, Attributes& attributes, vtkCPInputDataDescription* idd)
{
if (VTKGrid == nullptr)
{
// The grid structure isn't changing so we only build it
// the first time it's needed. If we needed the memory
// we could delete it and rebuild as necessary.
VTKGrid = vtkUnstructuredGrid::New();
BuildVTKGrid(grid);
}
UpdateVTKAttributes(grid, attributes, idd);
}
}
namespace FEAdaptor
{
void Initialize(int numScripts, char* scripts[])
{
if (Processor == nullptr)
{
Processor = vtkCPProcessor::New();
Processor->Initialize();
}
else
{
Processor->RemoveAllPipelines();
}
for (int i = 0; i < numScripts; i++)
{
if (auto pipeline = vtkCPPythonPipeline::CreateAndInitializePipeline(scripts[i]))
{
Processor->AddPipeline(pipeline);
}
else
{
vtkLogF(ERROR, "failed to setup pipeline for '%s'", scripts[i]);
}
}
}
void Finalize()
{
if (Processor)
{
Processor->Delete();
Processor = nullptr;
}
if (VTKGrid)
{
VTKGrid->Delete();
VTKGrid = nullptr;
}
}
void CoProcess(
Grid& grid, Attributes& attributes, double time, unsigned int timeStep, bool lastTimeStep)
{
vtkNew<vtkCPDataDescription> dataDescription;
dataDescription->AddInput("input");
dataDescription->SetTimeData(time, timeStep);
if (lastTimeStep == true)
{
// assume that we want to all the pipelines to execute if it
// is the last time step.
dataDescription->ForceOutputOn();
}
if (Processor->RequestDataDescription(dataDescription) != 0)
{
vtkCPInputDataDescription* idd = dataDescription->GetInputDescriptionByName("input");
BuildVTKDataStructures(grid, attributes, idd);
idd->SetGrid(VTKGrid);
Processor->CoProcess(dataDescription);
}
}
} // end of Catalyst namespace
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