ComputeBinIndices.h

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#ifndef vtkm_worklet_cosmotools_compute_bin_indices_h
#define vtkm_worklet_cosmotools_compute_bin_indices_h
 
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace cosmotools
{
 
// Worklet to compute the x,y,z index for every bin
template <typename T>
class ComputeBinIndices : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(FieldIn binId, // (input) bin Id
                                FieldOut binX, // (output) bin indices
                                FieldOut binY,
                                FieldOut binZ);
  using ExecutionSignature = void(_1, _2, _3, _4);
  using InputDomain = _1;
 
  vtkm::Id numBinsX, numBinsY, numBinsZ; // Number of bins each dimension
 
  // Constructor
  VTKM_EXEC_CONT
  ComputeBinIndices(vtkm::Id NX, vtkm::Id NY, vtkm::Id NZ)
    : numBinsX(NX)
    , numBinsY(NY)
    , numBinsZ(NZ)
  {
  }
 
  VTKM_EXEC
  void operator()(const vtkm::Id& bin, vtkm::Id& xbin, vtkm::Id& ybin, vtkm::Id& zbin) const
  {
    xbin = bin % numBinsX;
    ybin = (bin / numBinsX) % numBinsY;
    zbin = bin / (numBinsX * numBinsY);
  }
}; // ComputeBinIndices
}
}
}
 
#endif