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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkFloatArray.h"
#include "vtkNew.h"
#include "vtkTimerLog.h"
#include "vtkTypedDataArray.h"
#include "vtkTypedDataArrayIterator.h"
#include <cassert>
#include <iostream>
// undefine this to print benchmark results:
#define SILENT
// Create a subclass of vtkTypedDataArray:
namespace
{
class MyArray : public vtkTypedDataArray<float>
{
vtkFloatArray* Data;
public:
static MyArray* New() { VTK_STANDARD_NEW_BODY(MyArray); }
void Init(vtkFloatArray* array)
{
this->Data = array;
this->NumberOfComponents = array->GetNumberOfComponents();
this->MaxId = array->GetMaxId();
}
ValueType& GetValueReference(vtkIdType idx) override { return *this->Data->GetPointer(idx); }
// These pure virtuals are no-op -- all we care about is GetValueReference
// to test the iterator.
void SetTypedTuple(vtkIdType, const ValueType*) override {}
void InsertTypedTuple(vtkIdType, const ValueType*) override {}
vtkIdType InsertNextTypedTuple(const ValueType*) override { return 0; }
vtkIdType LookupTypedValue(ValueType) override { return 0; }
void LookupTypedValue(ValueType, vtkIdList*) override {}
ValueType GetValue(vtkIdType) const override { return 0; }
void SetValue(vtkIdType, ValueType) override {}
void GetTypedTuple(vtkIdType, ValueType*) const override {}
vtkIdType InsertNextValue(ValueType) override { return 0; }
void InsertValue(vtkIdType, ValueType) override {}
vtkTypeBool Allocate(vtkIdType, vtkIdType) override { return 0; }
vtkTypeBool Resize(vtkIdType) override { return 0; }
};
}
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;
array->SetNumberOfComponents(numComps);
array->SetNumberOfTuples(numTuples);
for (vtkIdType i = 0; i < numValues; ++i)
{
// Just fill with consistent data
array->SetValue(i, i % 97);
}
// Create the vtkTypedDataArray testing implementation:
vtkNew<MyArray> tdaContainer;
MyArray* tda = tdaContainer;
tda->Init(array);
// should be vtkAOSDataArrayTemplate<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(tda)->Begin();
vtkTypedDataArray<float>::Iterator tdaIter = vtkTypedDataArray<float>::FastDownCast(tda)->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->GetPointer(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 = tda->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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