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// SPDX-FileCopyrightText: Copyright (c) Kitware Inc.
// SPDX-License-Identifier: BSD-3-Clause
#include <cstdlib>
#include <iostream>
#include <iterator>
#include <mpi.h>
#include "FEDataStructures.h"
Particles::Particles(Grid& grid, size_t numParticlesPerProcess)
{
grid.GetGlobalBounds(this->GlobalBounds);
this->Coordinates.resize(3 * numParticlesPerProcess);
srand(0);
this->Advect();
}
void Particles::Advect()
{
int delta[3] = { static_cast<int>(this->GlobalBounds[1] - this->GlobalBounds[0]),
static_cast<int>(this->GlobalBounds[3] - this->GlobalBounds[2]),
static_cast<int>(this->GlobalBounds[5] - this->GlobalBounds[4]) };
for (size_t i = 0; i < this->Coordinates.size() / 3; i++)
{
for (size_t j = 0; j < 3; j++)
{
this->Coordinates[3 * i + j] = static_cast<double>(rand() % delta[j]);
}
}
}
Grid::Grid(const unsigned int numPoints[3], const double spacing[3])
{
if (numPoints[0] == 0 || numPoints[1] == 0 || numPoints[2] == 0)
{
std::cerr << "Must have a non-zero amount of points in each direction.\n";
}
this->GlobalBounds[0] = this->GlobalBounds[2] = this->GlobalBounds[4] = 0;
for (int i = 0; i < 3; i++)
{
this->GlobalBounds[1 + 2 * i] = (numPoints[i] - 1) * spacing[i];
}
// in parallel, we do a simple partitioning in the x-direction.
int mpiSize = 1;
int mpiRank = 0;
MPI_Comm_rank(MPI_COMM_WORLD, &mpiRank);
MPI_Comm_size(MPI_COMM_WORLD, &mpiSize);
unsigned int startXPoint = mpiRank * numPoints[0] / mpiSize;
unsigned int endXPoint = (mpiRank + 1) * numPoints[0] / mpiSize;
if (mpiSize != mpiRank + 1)
{
endXPoint++;
}
// create the points -- slowest in the x and fastest in the z directions
double coord[3] = { 0, 0, 0 };
for (unsigned int i = startXPoint; i < endXPoint; i++)
{
coord[0] = i * spacing[0];
for (unsigned int j = 0; j < numPoints[1]; j++)
{
coord[1] = j * spacing[1];
for (unsigned int k = 0; k < numPoints[2]; k++)
{
coord[2] = k * spacing[2];
// add the coordinate to the end of the vector
std::copy(coord, coord + 3, std::back_inserter(this->Points));
}
}
}
// create the hex cells
unsigned int cellPoints[8];
unsigned int numXPoints = endXPoint - startXPoint;
for (unsigned int i = 0; i < numXPoints - 1; i++)
{
for (unsigned int j = 0; j < numPoints[1] - 1; j++)
{
for (unsigned int k = 0; k < numPoints[2] - 1; k++)
{
cellPoints[0] = i * numPoints[1] * numPoints[2] + j * numPoints[2] + k;
cellPoints[1] = (i + 1) * numPoints[1] * numPoints[2] + j * numPoints[2] + k;
cellPoints[2] = (i + 1) * numPoints[1] * numPoints[2] + (j + 1) * numPoints[2] + k;
cellPoints[3] = i * numPoints[1] * numPoints[2] + (j + 1) * numPoints[2] + k;
cellPoints[4] = i * numPoints[1] * numPoints[2] + j * numPoints[2] + k + 1;
cellPoints[5] = (i + 1) * numPoints[1] * numPoints[2] + j * numPoints[2] + k + 1;
cellPoints[6] = (i + 1) * numPoints[1] * numPoints[2] + (j + 1) * numPoints[2] + k + 1;
cellPoints[7] = i * numPoints[1] * numPoints[2] + (j + 1) * numPoints[2] + k + 1;
std::copy(cellPoints, cellPoints + 8, std::back_inserter(this->Cells));
}
}
}
}
size_t Grid::GetNumberOfPoints()
{
return this->Points.size() / 3;
}
size_t Grid::GetNumberOfCells()
{
return this->Cells.size() / 8;
}
double* Grid::GetPointsArray()
{
if (this->Points.empty())
{
return nullptr;
}
return &(this->Points[0]);
}
double* Grid::GetPoint(size_t pointId)
{
if (pointId >= this->Points.size())
{
return nullptr;
}
return &(this->Points[pointId * 3]);
}
unsigned int* Grid::GetCellPoints(size_t cellId)
{
if (cellId >= this->Cells.size())
{
return nullptr;
}
return &(this->Cells[cellId * 8]);
}
void Grid::GetGlobalBounds(double globalBounds[6])
{
for (int i = 0; i < 6; i++)
{
globalBounds[i] = this->GlobalBounds[i];
}
}
Attributes::Attributes()
{
this->GridPtr = nullptr;
}
void Attributes::Initialize(Grid* grid)
{
this->GridPtr = grid;
}
void Attributes::UpdateFields(double time)
{
size_t numPoints = this->GridPtr->GetNumberOfPoints();
this->Velocity.resize(numPoints * 3);
for (size_t pt = 0; pt < numPoints; pt++)
{
double* coord = this->GridPtr->GetPoint(pt);
this->Velocity[pt] = coord[1] * time;
}
std::fill(this->Velocity.begin() + numPoints, this->Velocity.end(), 0.);
size_t numCells = this->GridPtr->GetNumberOfCells();
this->Pressure.resize(numCells);
std::fill(this->Pressure.begin(), this->Pressure.end(), 1.f);
}
double* Attributes::GetVelocityArray()
{
if (this->Velocity.empty())
{
return nullptr;
}
return &this->Velocity[0];
}
float* Attributes::GetPressureArray()
{
if (this->Pressure.empty())
{
return nullptr;
}
return &this->Pressure[0];
}
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