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/*=========================================================================
Program: Visualization Toolkit
Module: TestDataArrayIterators.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 "vtkFloatArray.h"
#include "vtkTimerLog.h"
#include "vtkTypedDataArray.h"
#include "vtkTypedDataArrayIterator.h"
#include "vtkNew.h"
#include <cassert>
#include <iostream>
// undefine this to print benchmark results:
#define SILENT
int TestDataArrayIterators(int, char *[])
{
vtkIdType numComps = 4;
vtkIdType numValues = 100000000; // 10 million
assert(numValues % numComps == 0);
vtkIdType numTuples = numValues / numComps;
vtkNew<vtkFloatArray> arrayContainer;
vtkFloatArray *array = arrayContainer.GetPointer();
array->SetNumberOfComponents(numComps);
array->SetNumberOfTuples(numTuples);
for (vtkIdType i = 0; i < numValues; ++i)
{
// Just fill with consistent data
array->SetValue(i, i % 97);
}
// should be vtkDataArrayTemplate<float>::Iterator (float*):
vtkFloatArray::Iterator datBegin = array->Begin();
vtkFloatArray::Iterator datIter = array->Begin();
if (typeid(datBegin) != typeid(float*))
{
std::cerr << "Error: vtkFloatArray::Iterator is not a float*.";
return EXIT_FAILURE;
}
// should be vtkTypedDataArrayIterator<float>:
vtkTypedDataArray<float>::Iterator tdaBegin =
vtkTypedDataArray<float>::FastDownCast(array)->Begin();
vtkTypedDataArray<float>::Iterator tdaIter =
vtkTypedDataArray<float>::FastDownCast(array)->Begin();
if (typeid(tdaBegin) != typeid(vtkTypedDataArrayIterator<float>))
{
std::cerr << "Error: vtkTypedDataArray<float>::Iterator is not a "
"vtkTypedDataArrayIterator<float>.";
return EXIT_FAILURE;
}
// Validate that the iterators return the same values from operator[] and
// operator* as GetValue;
for (vtkIdType i = 0; i < numValues; ++i)
{
float lookup = array->GetValue(i);
if (lookup != datBegin[i] || lookup != tdaBegin[i] ||
lookup != *datIter || lookup != *tdaIter)
{
std::cerr << "Mismatch at " << i << ":"
<< " GetValue(i)=" << lookup
<< " datBegin[i]=" << datBegin[i]
<< " tdaBegin[i]=" << tdaBegin[i]
<< " *datIter=" << *datIter
<< " *tdaIter=" << *tdaIter
<< std::endl;
return EXIT_FAILURE;
}
++datIter;
++tdaIter;
}
#ifndef SILENT
// Iterator timings.
vtkNew<vtkTimerLog> timer;
// Lookup:
float lookupSum = 0.f;
timer->StartTimer();
for (vtkIdType i = 0; i < numValues; ++i)
{
lookupSum += array->GetValueReference(i);
}
timer->StopTimer();
double lookupTime = timer->GetElapsedTime();
// Scalar iterator:
float datSum = 0.f;
timer->StartTimer();
vtkFloatArray::Iterator datEnd = array->End();
while (datBegin != datEnd)
{
datSum += *datBegin++;
}
timer->StopTimer();
double datTime = timer->GetElapsedTime();
// vtkTypedDataArrayIterator:
vtkTypedDataArray<float>::Iterator tdaEnd =
vtkTypedDataArray<float>::FastDownCast(array)->End();
float tdaSum = 0.f;
timer->StartTimer();
while (tdaBegin != tdaEnd)
{
tdaSum += *tdaBegin++;
}
timer->StopTimer();
double tdaTime = timer->GetElapsedTime();
std::cout << "GetValue time, sum: "
<< lookupTime << ", " << lookupSum << std::endl;
std::cout << "dat time, sum: "
<< datTime << ", " << datSum << std::endl;
std::cout << "tda time, sum: "
<< tdaTime << ", " << tdaSum << std::endl;
#endif
return EXIT_SUCCESS;
}
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