

// DO NOT EDIT !
// This file is generated using the MantaFlow preprocessor (prep generate).

/******************************************************************************
 *
 * MantaFlow fluid solver framework
 * Copyright 2011 Tobias Pfaff, Nils Thuerey
 *
 * This program is free software, distributed under the terms of the
 * Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Grid representation
 *
 ******************************************************************************/

#ifndef _GRID_H
#define _GRID_H

#include "manta.h"
#include "vectorbase.h"
#include "interpol.h"
#include "interpolHigh.h"
#include "kernel.h"

namespace Manta {
class LevelsetGrid;

//! Base class for all grids
class GridBase : public PbClass {
 public:
  enum GridType {
    TypeNone = 0,
    TypeReal = 1,
    TypeInt = 2,
    TypeVec3 = 4,
    TypeMAC = 8,
    TypeLevelset = 16,
    TypeFlags = 32
  };

  GridBase(FluidSolver *parent);
  static int _W_0(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    PbClass *obj = Pb::objFromPy(_self);
    if (obj)
      delete obj;
    try {
      PbArgs _args(_linargs, _kwds);
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(0, "GridBase::GridBase", !noTiming);
      {
        ArgLocker _lock;
        FluidSolver *parent = _args.getPtr<FluidSolver>("parent", 0, &_lock);
        obj = new GridBase(parent);
        obj->registerObject(_self, &_args);
        _args.check();
      }
      pbFinalizePlugin(obj->getParent(), "GridBase::GridBase", !noTiming);
      return 0;
    }
    catch (std::exception &e) {
      pbSetError("GridBase::GridBase", e.what());
      return -1;
    }
  }

  //! Get the grids X dimension
  inline int getSizeX() const
  {
    return mSize.x;
  }
  static PyObject *_W_1(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      GridBase *pbo = dynamic_cast<GridBase *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "GridBase::getSizeX", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getSizeX());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "GridBase::getSizeX", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("GridBase::getSizeX", e.what());
      return 0;
    }
  }

  //! Get the grids Y dimension
  inline int getSizeY() const
  {
    return mSize.y;
  }
  static PyObject *_W_2(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      GridBase *pbo = dynamic_cast<GridBase *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "GridBase::getSizeY", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getSizeY());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "GridBase::getSizeY", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("GridBase::getSizeY", e.what());
      return 0;
    }
  }

  //! Get the grids Z dimension
  inline int getSizeZ() const
  {
    return mSize.z;
  }
  static PyObject *_W_3(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      GridBase *pbo = dynamic_cast<GridBase *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "GridBase::getSizeZ", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getSizeZ());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "GridBase::getSizeZ", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("GridBase::getSizeZ", e.what());
      return 0;
    }
  }

  //! Get the grids dimensions
  inline Vec3i getSize() const
  {
    return mSize;
  }
  static PyObject *_W_4(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      GridBase *pbo = dynamic_cast<GridBase *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "GridBase::getSize", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getSize());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "GridBase::getSize", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("GridBase::getSize", e.what());
      return 0;
    }
  }

  //! Get Stride in X dimension
  inline IndexInt getStrideX() const
  {
    return 1;
  }
  //! Get Stride in Y dimension
  inline IndexInt getStrideY() const
  {
    return mSize.x;
  }
  //! Get Stride in Z dimension
  inline IndexInt getStrideZ() const
  {
    return mStrideZ;
  }

  inline Real getDx() const
  {
    return mDx;
  }

  //! Check if indices are within bounds, otherwise error (should only be called when debugging)
  inline void checkIndex(int i, int j, int k) const;
  //! Check if indices are within bounds, otherwise error (should only be called when debugging)
  inline void checkIndex(IndexInt idx) const;
  //! Check if index is within given boundaries
  inline bool isInBounds(const Vec3i &p, int bnd) const;
  //! Check if index is within given boundaries
  inline bool isInBounds(const Vec3i &p) const;
  //! Check if index is within given boundaries
  inline bool isInBounds(const Vec3 &p, int bnd = 0) const
  {
    return isInBounds(toVec3i(p), bnd);
  }
  //! Check if linear index is in the range of the array
  inline bool isInBounds(IndexInt idx) const;

  //! Get the type of grid
  inline GridType getType() const
  {
    return mType;
  }
  //! Check dimensionality
  inline bool is3D() const
  {
    return m3D;
  }
  static PyObject *_W_5(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      GridBase *pbo = dynamic_cast<GridBase *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "GridBase::is3D", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->is3D());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "GridBase::is3D", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("GridBase::is3D", e.what());
      return 0;
    }
  }

  //! Get index into the data
  inline IndexInt index(int i, int j, int k) const
  {
    DEBUG_ONLY(checkIndex(i, j, k));
    return (IndexInt)i + (IndexInt)mSize.x * j + (IndexInt)mStrideZ * k;
  }
  //! Get index into the data
  inline IndexInt index(const Vec3i &pos) const
  {
    DEBUG_ONLY(checkIndex(pos.x, pos.y, pos.z));
    return (IndexInt)pos.x + (IndexInt)mSize.x * pos.y + (IndexInt)mStrideZ * pos.z;
  }

  //! grid4d compatibility functions
  inline bool is4D() const
  {
    return false;
  }
  static PyObject *_W_6(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      GridBase *pbo = dynamic_cast<GridBase *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "GridBase::is4D", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->is4D());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "GridBase::is4D", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("GridBase::is4D", e.what());
      return 0;
    }
  }

  inline int getSizeT() const
  {
    return 1;
  }
  static PyObject *_W_7(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      GridBase *pbo = dynamic_cast<GridBase *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "GridBase::getSizeT", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getSizeT());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "GridBase::getSizeT", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("GridBase::getSizeT", e.what());
      return 0;
    }
  }

  inline int getStrideT() const
  {
    return 0;
  }
  static PyObject *_W_8(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      GridBase *pbo = dynamic_cast<GridBase *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "GridBase::getStrideT", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getStrideT());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "GridBase::getStrideT", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("GridBase::getStrideT", e.what());
      return 0;
    }
  }

  inline int index(int i, int j, int k, int unused) const
  {
    return index(i, j, k);
  }
  inline bool isInBounds(int i, int j, int k, int t, int bnd) const
  {
    if (t != 0)
      return false;
    return isInBounds(Vec3i(i, j, k), bnd);
  }

 protected:
  GridType mType;
  Vec3i mSize;
  Real mDx;
  bool m3D;  // precomputed Z shift: to ensure 2D compatibility, always use this instead of sx*sy !
  IndexInt mStrideZ;
 public:
  PbArgs _args;
}
#define _C_GridBase
;

//! Grid class

template<class T> class Grid : public GridBase {
 public:
  //! init new grid, values are set to zero
  Grid(FluidSolver *parent, bool show = true);
  static int _W_9(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    PbClass *obj = Pb::objFromPy(_self);
    if (obj)
      delete obj;
    try {
      PbArgs _args(_linargs, _kwds);
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(0, "Grid::Grid", !noTiming);
      {
        ArgLocker _lock;
        FluidSolver *parent = _args.getPtr<FluidSolver>("parent", 0, &_lock);
        bool show = _args.getOpt<bool>("show", 1, true, &_lock);
        obj = new Grid(parent, show);
        obj->registerObject(_self, &_args);
        _args.check();
      }
      pbFinalizePlugin(obj->getParent(), "Grid::Grid", !noTiming);
      return 0;
    }
    catch (std::exception &e) {
      pbSetError("Grid::Grid", e.what());
      return -1;
    }
  }

  //! init new grid with an existing array
  Grid(FluidSolver *parent, T *data, bool show = true);
  //! create new & copy content from another grid
  Grid(const Grid<T> &a);
  //! return memory to solver
  virtual ~Grid();

  typedef T BASETYPE;
  typedef GridBase BASETYPE_GRID;

  void save(std::string name);
  static PyObject *_W_10(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::save", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        std::string name = _args.get<std::string>("name", 0, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->save(name);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::save", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::save", e.what());
      return 0;
    }
  }

  void load(std::string name);
  static PyObject *_W_11(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::load", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        std::string name = _args.get<std::string>("name", 0, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->load(name);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::load", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::load", e.what());
      return 0;
    }
  }

  //! set all cells to zero
  void clear();
  static PyObject *_W_12(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::clear", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->clear();
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::clear", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::clear", e.what());
      return 0;
    }
  }

  //! all kinds of access functions, use grid(), grid[] or grid.get()
  //! access data
  inline T get(int i, int j, int k) const
  {
    return mData[index(i, j, k)];
  }
  //! access data
  inline T &get(int i, int j, int k)
  {
    return mData[index(i, j, k)];
  }
  //! access data
  inline T get(IndexInt idx) const
  {
    DEBUG_ONLY(checkIndex(idx));
    return mData[idx];
  }
  //! access data
  inline T get(const Vec3i &pos) const
  {
    return mData[index(pos)];
  }
  //! access data
  inline T &operator()(int i, int j, int k)
  {
    return mData[index(i, j, k)];
  }
  //! access data
  inline T operator()(int i, int j, int k) const
  {
    return mData[index(i, j, k)];
  }
  //! access data
  inline T &operator()(IndexInt idx)
  {
    DEBUG_ONLY(checkIndex(idx));
    return mData[idx];
  }
  //! access data
  inline T operator()(IndexInt idx) const
  {
    DEBUG_ONLY(checkIndex(idx));
    return mData[idx];
  }
  //! access data
  inline T &operator()(const Vec3i &pos)
  {
    return mData[index(pos)];
  }
  //! access data
  inline T operator()(const Vec3i &pos) const
  {
    return mData[index(pos)];
  }
  //! access data
  inline T &operator[](IndexInt idx)
  {
    DEBUG_ONLY(checkIndex(idx));
    return mData[idx];
  }
  //! access data
  inline const T operator[](IndexInt idx) const
  {
    DEBUG_ONLY(checkIndex(idx));
    return mData[idx];
  }

  // interpolated access
  inline T getInterpolated(const Vec3 &pos) const
  {
    return interpol<T>(mData, mSize, mStrideZ, pos);
  }
  inline void setInterpolated(const Vec3 &pos, const T &val, Grid<Real> &sumBuffer) const
  {
    setInterpol<T>(mData, mSize, mStrideZ, pos, val, &sumBuffer[0]);
  }
  // higher order interpolation (1=linear, 2=cubic)
  inline T getInterpolatedHi(const Vec3 &pos, int order) const
  {
    switch (order) {
      case 1:
        return interpol<T>(mData, mSize, mStrideZ, pos);
      case 2:
        return interpolCubic<T>(mData, mSize, mStrideZ, pos);
      default:
        assertMsg(false, "Unknown interpolation order " << order);
    }
    return T(0.);  // should never be reached, just to prevent compiler warnings
  }

  // assignment / copy

  //! warning - do not use "=" for grids in python, this copies the reference! not the grid
  //! content...
  // Grid<T>& operator=(const Grid<T>& a);
  //! copy content from other grid (use this one instead of operator= !)
  Grid<T> &copyFrom(const Grid<T> &a, bool copyType = true);
  static PyObject *_W_13(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::copyFrom", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        const Grid<T> &a = *_args.getPtr<Grid<T>>("a", 0, &_lock);
        bool copyType = _args.getOpt<bool>("copyType", 1, true, &_lock);
        pbo->_args.copy(_args);
        _retval = toPy(pbo->copyFrom(a, copyType));
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::copyFrom", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::copyFrom", e.what());
      return 0;
    }
  }
  // old: { *this = a; }

  // helper functions to work with grids in scene files

  //! get grid type
  int getGridType();
  static PyObject *_W_14(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::getGridType", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getGridType());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::getGridType", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::getGridType", e.what());
      return 0;
    }
  }

  //! add/subtract other grid
  void add(const Grid<T> &a);
  static PyObject *_W_15(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::add", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        const Grid<T> &a = *_args.getPtr<Grid<T>>("a", 0, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->add(a);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::add", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::add", e.what());
      return 0;
    }
  }

  void sub(const Grid<T> &a);
  static PyObject *_W_16(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::sub", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        const Grid<T> &a = *_args.getPtr<Grid<T>>("a", 0, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->sub(a);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::sub", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::sub", e.what());
      return 0;
    }
  }

  //! set all cells to constant value
  void setConst(T s);
  static PyObject *_W_17(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::setConst", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        T s = _args.get<T>("s", 0, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->setConst(s);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::setConst", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::setConst", e.what());
      return 0;
    }
  }

  //! add constant to all grid cells
  void addConst(T s);
  static PyObject *_W_18(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::addConst", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        T s = _args.get<T>("s", 0, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->addConst(s);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::addConst", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::addConst", e.what());
      return 0;
    }
  }

  //! add scaled other grid to current one (note, only "Real" factor, "T" type not supported here!)
  void addScaled(const Grid<T> &a, const T &factor);
  static PyObject *_W_19(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::addScaled", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        const Grid<T> &a = *_args.getPtr<Grid<T>>("a", 0, &_lock);
        const T &factor = *_args.getPtr<T>("factor", 1, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->addScaled(a, factor);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::addScaled", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::addScaled", e.what());
      return 0;
    }
  }

  //! multiply contents of grid
  void mult(const Grid<T> &a);
  static PyObject *_W_20(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::mult", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        const Grid<T> &a = *_args.getPtr<Grid<T>>("a", 0, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->mult(a);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::mult", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::mult", e.what());
      return 0;
    }
  }

  //! multiply each cell by a constant scalar value
  void multConst(T s);
  static PyObject *_W_21(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::multConst", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        T s = _args.get<T>("s", 0, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->multConst(s);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::multConst", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::multConst", e.what());
      return 0;
    }
  }

  //! safely divide contents of grid (with zero check)
  Grid<T> &safeDivide(const Grid<T> &a);
  static PyObject *_W_22(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::safeDivide", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        const Grid<T> &a = *_args.getPtr<Grid<T>>("a", 0, &_lock);
        pbo->_args.copy(_args);
        _retval = toPy(pbo->safeDivide(a));
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::safeDivide", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::safeDivide", e.what());
      return 0;
    }
  }

  //! clamp content to range (for vec3, clamps each component separately)
  void clamp(Real min, Real max);
  static PyObject *_W_23(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::clamp", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        Real min = _args.get<Real>("min", 0, &_lock);
        Real max = _args.get<Real>("max", 1, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->clamp(min, max);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::clamp", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::clamp", e.what());
      return 0;
    }
  }

  //! reduce small values to zero
  void stomp(const T &threshold);
  static PyObject *_W_24(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::stomp", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        const T &threshold = *_args.getPtr<T>("threshold", 0, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->stomp(threshold);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::stomp", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::stomp", e.what());
      return 0;
    }
  }

  //! permute grid axes, e.g. switch y with z (0,2,1)
  void permuteAxes(int axis0, int axis1, int axis2);
  static PyObject *_W_25(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::permuteAxes", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        int axis0 = _args.get<int>("axis0", 0, &_lock);
        int axis1 = _args.get<int>("axis1", 1, &_lock);
        int axis2 = _args.get<int>("axis2", 2, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->permuteAxes(axis0, axis1, axis2);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::permuteAxes", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::permuteAxes", e.what());
      return 0;
    }
  }

  //! permute grid axes, e.g. switch y with z (0,2,1)
  void permuteAxesCopyToGrid(int axis0, int axis1, int axis2, Grid<T> &out);
  static PyObject *_W_26(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::permuteAxesCopyToGrid", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        int axis0 = _args.get<int>("axis0", 0, &_lock);
        int axis1 = _args.get<int>("axis1", 1, &_lock);
        int axis2 = _args.get<int>("axis2", 2, &_lock);
        Grid<T> &out = *_args.getPtr<Grid<T>>("out", 3, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->permuteAxesCopyToGrid(axis0, axis1, axis2, out);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::permuteAxesCopyToGrid", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::permuteAxesCopyToGrid", e.what());
      return 0;
    }
  }

  //! join other grid by either keeping min or max value at cell
  void join(const Grid<T> &a, bool keepMax = true);
  static PyObject *_W_27(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::join", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        const Grid<T> &a = *_args.getPtr<Grid<T>>("a", 0, &_lock);
        bool keepMax = _args.getOpt<bool>("keepMax", 1, true, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->join(a, keepMax);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::join", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::join", e.what());
      return 0;
    }
  }

  // common compound operators
  //! get absolute max value in grid
  Real getMaxAbs() const;
  static PyObject *_W_28(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::getMaxAbs", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getMaxAbs());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::getMaxAbs", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::getMaxAbs", e.what());
      return 0;
    }
  }

  //! get max value in grid
  Real getMax() const;
  static PyObject *_W_29(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::getMax", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getMax());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::getMax", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::getMax", e.what());
      return 0;
    }
  }

  //! get min value in grid
  Real getMin() const;
  static PyObject *_W_30(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::getMin", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getMin());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::getMin", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::getMin", e.what());
      return 0;
    }
  }

  //! calculate L1 norm of grid content
  Real getL1(int bnd = 0);
  static PyObject *_W_31(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::getL1", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        int bnd = _args.getOpt<int>("bnd", 0, 0, &_lock);
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getL1(bnd));
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::getL1", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::getL1", e.what());
      return 0;
    }
  }

  //! calculate L2 norm of grid content
  Real getL2(int bnd = 0);
  static PyObject *_W_32(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::getL2", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        int bnd = _args.getOpt<int>("bnd", 0, 0, &_lock);
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getL2(bnd));
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::getL2", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::getL2", e.what());
      return 0;
    }
  }

  //! set all boundary cells to constant value (Dirichlet)
  void setBound(T value, int boundaryWidth = 1);
  static PyObject *_W_33(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::setBound", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        T value = _args.get<T>("value", 0, &_lock);
        int boundaryWidth = _args.getOpt<int>("boundaryWidth", 1, 1, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->setBound(value, boundaryWidth);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::setBound", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::setBound", e.what());
      return 0;
    }
  }

  //! set all boundary cells to last inner value (Neumann)
  void setBoundNeumann(int boundaryWidth = 1);
  static PyObject *_W_34(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::setBoundNeumann", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        int boundaryWidth = _args.getOpt<int>("boundaryWidth", 0, 1, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->setBoundNeumann(boundaryWidth);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::setBoundNeumann", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::setBoundNeumann", e.what());
      return 0;
    }
  }

  //! get data pointer of grid
  std::string getDataPointer();
  static PyObject *_W_35(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::getDataPointer", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        pbo->_args.copy(_args);
        _retval = toPy(pbo->getDataPointer());
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::getDataPointer", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::getDataPointer", e.what());
      return 0;
    }
  }

  //! debugging helper, print grid from python. skip boundary of width bnd
  void printGrid(int zSlice = -1, bool printIndex = false, int bnd = 1);
  static PyObject *_W_36(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      Grid *pbo = dynamic_cast<Grid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "Grid::printGrid", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        int zSlice = _args.getOpt<int>("zSlice", 0, -1, &_lock);
        bool printIndex = _args.getOpt<bool>("printIndex", 1, false, &_lock);
        int bnd = _args.getOpt<int>("bnd", 2, 1, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->printGrid(zSlice, printIndex, bnd);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "Grid::printGrid", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("Grid::printGrid", e.what());
      return 0;
    }
  }

  // c++ only operators
  template<class S> Grid<T> &operator+=(const Grid<S> &a);
  template<class S> Grid<T> &operator+=(const S &a);
  template<class S> Grid<T> &operator-=(const Grid<S> &a);
  template<class S> Grid<T> &operator-=(const S &a);
  template<class S> Grid<T> &operator*=(const Grid<S> &a);
  template<class S> Grid<T> &operator*=(const S &a);
  template<class S> Grid<T> &operator/=(const Grid<S> &a);
  template<class S> Grid<T> &operator/=(const S &a);

  //! Swap data with another grid (no actual data is moved)
  void swap(Grid<T> &other);

  //! grid4d compatibility functions
  inline T &operator()(int i, int j, int k, int unused)
  {
    return mData[index(i, j, k)];
  }
  inline T operator()(int i, int j, int k, int unused) const
  {
    return mData[index(i, j, k)];
  }

 protected:
  T *mData;
  bool externalData;  // True if mData is managed outside of the Fluidsolver
 public:
  PbArgs _args;
}
#define _C_Grid
;

// Python doesn't know about templates: explicit aliases needed

//! Special function for staggered grids
class MACGrid : public Grid<Vec3> {
 public:
  MACGrid(FluidSolver *parent, bool show = true) : Grid<Vec3>(parent, show)
  {
    mType = (GridType)(TypeMAC | TypeVec3);
  }
  static int _W_37(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    PbClass *obj = Pb::objFromPy(_self);
    if (obj)
      delete obj;
    try {
      PbArgs _args(_linargs, _kwds);
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(0, "MACGrid::MACGrid", !noTiming);
      {
        ArgLocker _lock;
        FluidSolver *parent = _args.getPtr<FluidSolver>("parent", 0, &_lock);
        bool show = _args.getOpt<bool>("show", 1, true, &_lock);
        obj = new MACGrid(parent, show);
        obj->registerObject(_self, &_args);
        _args.check();
      }
      pbFinalizePlugin(obj->getParent(), "MACGrid::MACGrid", !noTiming);
      return 0;
    }
    catch (std::exception &e) {
      pbSetError("MACGrid::MACGrid", e.what());
      return -1;
    }
  }

  MACGrid(FluidSolver *parent, Vec3 *data, bool show = true) : Grid<Vec3>(parent, data, show)
  {
    mType = (GridType)(TypeMAC | TypeVec3);
  }

  // specialized functions for interpolating MAC information
  inline Vec3 getCentered(int i, int j, int k) const;
  inline Vec3 getCentered(const Vec3i &pos) const
  {
    return getCentered(pos.x, pos.y, pos.z);
  }
  inline Vec3 getAtMACX(int i, int j, int k) const;
  inline Vec3 getAtMACY(int i, int j, int k) const;
  inline Vec3 getAtMACZ(int i, int j, int k) const;
  // interpolation
  inline Vec3 getInterpolated(const Vec3 &pos) const
  {
    return interpolMAC(mData, mSize, mStrideZ, pos);
  }
  inline void setInterpolated(const Vec3 &pos, const Vec3 &val, Vec3 *tmp) const
  {
    return setInterpolMAC(mData, mSize, mStrideZ, pos, val, tmp);
  }
  inline Vec3 getInterpolatedHi(const Vec3 &pos, int order) const
  {
    switch (order) {
      case 1:
        return interpolMAC(mData, mSize, mStrideZ, pos);
      case 2:
        return interpolCubicMAC(mData, mSize, mStrideZ, pos);
      default:
        assertMsg(false, "Unknown interpolation order " << order);
    }
    return Vec3(0.);  // should never be reached, just to prevent compiler warnings
  }
  // specials for mac grid:
  template<int comp> inline Real getInterpolatedComponent(Vec3 pos) const
  {
    return interpolComponent<comp>(mData, mSize, mStrideZ, pos);
  }
  template<int comp> inline Real getInterpolatedComponentHi(const Vec3 &pos, int order) const
  {
    switch (order) {
      case 1:
        return interpolComponent<comp>(mData, mSize, mStrideZ, pos);
      case 2:
        return interpolCubicMAC(mData, mSize, mStrideZ, pos)[comp];  // warning - not yet optimized
      default:
        assertMsg(false, "Unknown interpolation order " << order);
    }
    return 0.;  // should never be reached, just to prevent compiler warnings
  }

  //! set all boundary cells of a MAC grid to certain value (Dirchlet). Respects staggered grid
  //! locations optionally, only set normal components
  void setBoundMAC(Vec3 value, int boundaryWidth, bool normalOnly = false);
  static PyObject *_W_38(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      MACGrid *pbo = dynamic_cast<MACGrid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "MACGrid::setBoundMAC", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        Vec3 value = _args.get<Vec3>("value", 0, &_lock);
        int boundaryWidth = _args.get<int>("boundaryWidth", 1, &_lock);
        bool normalOnly = _args.getOpt<bool>("normalOnly", 2, false, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->setBoundMAC(value, boundaryWidth, normalOnly);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "MACGrid::setBoundMAC", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("MACGrid::setBoundMAC", e.what());
      return 0;
    }
  }

 protected:
 public:
  PbArgs _args;
}
#define _C_MACGrid
;

//! Special functions for FlagGrid
class FlagGrid : public Grid<int> {
 public:
  FlagGrid(FluidSolver *parent, int dim = 3, bool show = true) : Grid<int>(parent, show)
  {
    mType = (GridType)(TypeFlags | TypeInt);
  }
  static int _W_39(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    PbClass *obj = Pb::objFromPy(_self);
    if (obj)
      delete obj;
    try {
      PbArgs _args(_linargs, _kwds);
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(0, "FlagGrid::FlagGrid", !noTiming);
      {
        ArgLocker _lock;
        FluidSolver *parent = _args.getPtr<FluidSolver>("parent", 0, &_lock);
        int dim = _args.getOpt<int>("dim", 1, 3, &_lock);
        bool show = _args.getOpt<bool>("show", 2, true, &_lock);
        obj = new FlagGrid(parent, dim, show);
        obj->registerObject(_self, &_args);
        _args.check();
      }
      pbFinalizePlugin(obj->getParent(), "FlagGrid::FlagGrid", !noTiming);
      return 0;
    }
    catch (std::exception &e) {
      pbSetError("FlagGrid::FlagGrid", e.what());
      return -1;
    }
  }

  FlagGrid(FluidSolver *parent, int *data, int dim = 3, bool show = true)
      : Grid<int>(parent, data, show)
  {
    mType = (GridType)(TypeFlags | TypeInt);
  }

  //! types of cells, in/outflow can be combined, e.g., TypeFluid|TypeInflow
  enum CellType {
    TypeNone = 0,
    TypeFluid = 1,
    TypeObstacle = 2,
    TypeEmpty = 4,
    TypeInflow = 8,
    TypeOutflow = 16,
    TypeOpen = 32,
    TypeStick = 64,
    TypeReserved = 256
  };

  //! access for particles
  inline int getAt(const Vec3 &pos) const
  {
    return mData[index((int)pos.x, (int)pos.y, (int)pos.z)];
  }

  //! check for different flag types
  inline bool isObstacle(IndexInt idx) const
  {
    return get(idx) & TypeObstacle;
  }
  inline bool isObstacle(int i, int j, int k) const
  {
    return get(i, j, k) & TypeObstacle;
  }
  inline bool isObstacle(const Vec3i &pos) const
  {
    return get(pos) & TypeObstacle;
  }
  inline bool isObstacle(const Vec3 &pos) const
  {
    return getAt(pos) & TypeObstacle;
  }
  inline bool isFluid(IndexInt idx) const
  {
    return get(idx) & TypeFluid;
  }
  inline bool isFluid(int i, int j, int k) const
  {
    return get(i, j, k) & TypeFluid;
  }
  inline bool isFluid(const Vec3i &pos) const
  {
    return get(pos) & TypeFluid;
  }
  inline bool isFluid(const Vec3 &pos) const
  {
    return getAt(pos) & TypeFluid;
  }
  inline bool isInflow(IndexInt idx) const
  {
    return get(idx) & TypeInflow;
  }
  inline bool isInflow(int i, int j, int k) const
  {
    return get(i, j, k) & TypeInflow;
  }
  inline bool isInflow(const Vec3i &pos) const
  {
    return get(pos) & TypeInflow;
  }
  inline bool isInflow(const Vec3 &pos) const
  {
    return getAt(pos) & TypeInflow;
  }
  inline bool isEmpty(IndexInt idx) const
  {
    return get(idx) & TypeEmpty;
  }
  inline bool isEmpty(int i, int j, int k) const
  {
    return get(i, j, k) & TypeEmpty;
  }
  inline bool isEmpty(const Vec3i &pos) const
  {
    return get(pos) & TypeEmpty;
  }
  inline bool isEmpty(const Vec3 &pos) const
  {
    return getAt(pos) & TypeEmpty;
  }
  inline bool isOutflow(IndexInt idx) const
  {
    return get(idx) & TypeOutflow;
  }
  inline bool isOutflow(int i, int j, int k) const
  {
    return get(i, j, k) & TypeOutflow;
  }
  inline bool isOutflow(const Vec3i &pos) const
  {
    return get(pos) & TypeOutflow;
  }
  inline bool isOutflow(const Vec3 &pos) const
  {
    return getAt(pos) & TypeOutflow;
  }
  inline bool isOpen(IndexInt idx) const
  {
    return get(idx) & TypeOpen;
  }
  inline bool isOpen(int i, int j, int k) const
  {
    return get(i, j, k) & TypeOpen;
  }
  inline bool isOpen(const Vec3i &pos) const
  {
    return get(pos) & TypeOpen;
  }
  inline bool isOpen(const Vec3 &pos) const
  {
    return getAt(pos) & TypeOpen;
  }
  inline bool isStick(IndexInt idx) const
  {
    return get(idx) & TypeStick;
  }
  inline bool isStick(int i, int j, int k) const
  {
    return get(i, j, k) & TypeStick;
  }
  inline bool isStick(const Vec3i &pos) const
  {
    return get(pos) & TypeStick;
  }
  inline bool isStick(const Vec3 &pos) const
  {
    return getAt(pos) & TypeStick;
  }

  void InitMinXWall(const int &boundaryWidth, Grid<Real> &phiWalls);
  void InitMaxXWall(const int &boundaryWidth, Grid<Real> &phiWalls);
  void InitMinYWall(const int &boundaryWidth, Grid<Real> &phiWalls);
  void InitMaxYWall(const int &boundaryWidth, Grid<Real> &phiWalls);
  void InitMinZWall(const int &boundaryWidth, Grid<Real> &phiWalls);
  void InitMaxZWall(const int &boundaryWidth, Grid<Real> &phiWalls);
  // Python callables

  void initDomain(const int &boundaryWidth = 0,
                  const std::string &wall = "xXyYzZ",
                  const std::string &open = "      ",
                  const std::string &inflow = "      ",
                  const std::string &outflow = "      ",
                  Grid<Real> *phiWalls = 0x00);
  static PyObject *_W_40(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      FlagGrid *pbo = dynamic_cast<FlagGrid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "FlagGrid::initDomain", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        const int &boundaryWidth = _args.getOpt<int>("boundaryWidth", 0, 0, &_lock);
        const std::string &wall = _args.getOpt<std::string>("wall", 1, "xXyYzZ", &_lock);
        const std::string &open = _args.getOpt<std::string>("open", 2, "      ", &_lock);
        const std::string &inflow = _args.getOpt<std::string>("inflow", 3, "      ", &_lock);
        const std::string &outflow = _args.getOpt<std::string>("outflow", 4, "      ", &_lock);
        Grid<Real> *phiWalls = _args.getPtrOpt<Grid<Real>>("phiWalls", 5, 0x00, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->initDomain(boundaryWidth, wall, open, inflow, outflow, phiWalls);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "FlagGrid::initDomain", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("FlagGrid::initDomain", e.what());
      return 0;
    }
  }

  void initBoundaries(const int &boundaryWidth, const int *types);

  //! set fluid flags inside levelset (liquids)
  void updateFromLevelset(LevelsetGrid &levelset);
  static PyObject *_W_41(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      FlagGrid *pbo = dynamic_cast<FlagGrid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "FlagGrid::updateFromLevelset", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        LevelsetGrid &levelset = *_args.getPtr<LevelsetGrid>("levelset", 0, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->updateFromLevelset(levelset);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "FlagGrid::updateFromLevelset", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("FlagGrid::updateFromLevelset", e.what());
      return 0;
    }
  }

  //! set all cells (except obs/in/outflow) to type (fluid by default)
  void fillGrid(int type = TypeFluid);
  static PyObject *_W_42(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      FlagGrid *pbo = dynamic_cast<FlagGrid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "FlagGrid::fillGrid", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        int type = _args.getOpt<int>("type", 0, TypeFluid, &_lock);
        pbo->_args.copy(_args);
        _retval = getPyNone();
        pbo->fillGrid(type);
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "FlagGrid::fillGrid", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("FlagGrid::fillGrid", e.what());
      return 0;
    }
  }

  //! count no. of cells matching flags via "AND"
  //! warning for large grids! only regular int returned (due to python interface)
  //! optionally creates mask in RealGrid (1 where flag matches, 0 otherwise)
  int countCells(int flag, int bnd = 0, Grid<Real> *mask = NULL);
  static PyObject *_W_43(PyObject *_self, PyObject *_linargs, PyObject *_kwds)
  {
    try {
      PbArgs _args(_linargs, _kwds);
      FlagGrid *pbo = dynamic_cast<FlagGrid *>(Pb::objFromPy(_self));
      bool noTiming = _args.getOpt<bool>("notiming", -1, 0);
      pbPreparePlugin(pbo->getParent(), "FlagGrid::countCells", !noTiming);
      PyObject *_retval = 0;
      {
        ArgLocker _lock;
        int flag = _args.get<int>("flag", 0, &_lock);
        int bnd = _args.getOpt<int>("bnd", 1, 0, &_lock);
        Grid<Real> *mask = _args.getPtrOpt<Grid<Real>>("mask", 2, NULL, &_lock);
        pbo->_args.copy(_args);
        _retval = toPy(pbo->countCells(flag, bnd, mask));
        pbo->_args.check();
      }
      pbFinalizePlugin(pbo->getParent(), "FlagGrid::countCells", !noTiming);
      return _retval;
    }
    catch (std::exception &e) {
      pbSetError("FlagGrid::countCells", e.what());
      return 0;
    }
  }

 public:
  PbArgs _args;
}
#define _C_FlagGrid
;

//! helper to compute grid conversion factor between local coordinates of two grids
inline Vec3 calcGridSizeFactor(Vec3i s1, Vec3i s2)
{
  return Vec3(Real(s1[0]) / s2[0], Real(s1[1]) / s2[1], Real(s1[2]) / s2[2]);
}

// prototypes for grid plugins
void copyMacToVec3(MACGrid &source, Grid<Vec3> &target);
void convertMacToVec3(MACGrid &source, Grid<Vec3> &target);
void resampleVec3ToMac(Grid<Vec3> &source, MACGrid &target);
void resampleMacToVec3(MACGrid &source, Grid<Vec3> &target);

void getComponent(const Grid<Vec3> &source, Grid<Real> &target, int component);
void setComponent(const Grid<Real> &source, Grid<Vec3> &target, int component);

//******************************************************************************
// Implementation of inline functions

inline void GridBase::checkIndex(int i, int j, int k) const
{
  if (i < 0 || j < 0 || k < 0 || i >= mSize.x || j >= mSize.y || k >= mSize.z) {
    std::ostringstream s;
    s << "Grid " << mName << " dim " << mSize << " : index " << i << "," << j << "," << k
      << " out of bound ";
    errMsg(s.str());
  }
}

inline void GridBase::checkIndex(IndexInt idx) const
{
  if (idx < 0 || idx >= mSize.x * mSize.y * mSize.z) {
    std::ostringstream s;
    s << "Grid " << mName << " dim " << mSize << " : index " << idx << " out of bound ";
    errMsg(s.str());
  }
}

bool GridBase::isInBounds(const Vec3i &p) const
{
  return (p.x >= 0 && p.y >= 0 && p.z >= 0 && p.x < mSize.x && p.y < mSize.y && p.z < mSize.z);
}

bool GridBase::isInBounds(const Vec3i &p, int bnd) const
{
  bool ret = (p.x >= bnd && p.y >= bnd && p.x < mSize.x - bnd && p.y < mSize.y - bnd);
  if (this->is3D()) {
    ret &= (p.z >= bnd && p.z < mSize.z - bnd);
  }
  else {
    ret &= (p.z == 0);
  }
  return ret;
}
//! Check if linear index is in the range of the array
bool GridBase::isInBounds(IndexInt idx) const
{
  if (idx < 0 || idx >= mSize.x * mSize.y * mSize.z) {
    return false;
  }
  return true;
}

inline Vec3 MACGrid::getCentered(int i, int j, int k) const
{
  DEBUG_ONLY(checkIndex(i + 1, j + 1, k));
  const IndexInt idx = index(i, j, k);
  Vec3 v = Vec3(
      0.5 * (mData[idx].x + mData[idx + 1].x), 0.5 * (mData[idx].y + mData[idx + mSize.x].y), 0.);
  if (this->is3D()) {
    DEBUG_ONLY(checkIndex(idx + mStrideZ));
    v[2] = 0.5 * (mData[idx].z + mData[idx + mStrideZ].z);
  }
  return v;
}

inline Vec3 MACGrid::getAtMACX(int i, int j, int k) const
{
  DEBUG_ONLY(checkIndex(i - 1, j + 1, k));
  const IndexInt idx = index(i, j, k);
  Vec3 v = Vec3((mData[idx].x),
                0.25 * (mData[idx].y + mData[idx - 1].y + mData[idx + mSize.x].y +
                        mData[idx + mSize.x - 1].y),
                0.);
  if (this->is3D()) {
    DEBUG_ONLY(checkIndex(idx + mStrideZ - 1));
    v[2] = 0.25 * (mData[idx].z + mData[idx - 1].z + mData[idx + mStrideZ].z +
                   mData[idx + mStrideZ - 1].z);
  }
  return v;
}

inline Vec3 MACGrid::getAtMACY(int i, int j, int k) const
{
  DEBUG_ONLY(checkIndex(i + 1, j - 1, k));
  const IndexInt idx = index(i, j, k);
  Vec3 v = Vec3(0.25 * (mData[idx].x + mData[idx - mSize.x].x + mData[idx + 1].x +
                        mData[idx + 1 - mSize.x].x),
                (mData[idx].y),
                0.);
  if (this->is3D()) {
    DEBUG_ONLY(checkIndex(idx + mStrideZ - mSize.x));
    v[2] = 0.25 * (mData[idx].z + mData[idx - mSize.x].z + mData[idx + mStrideZ].z +
                   mData[idx + mStrideZ - mSize.x].z);
  }
  return v;
}

inline Vec3 MACGrid::getAtMACZ(int i, int j, int k) const
{
  const IndexInt idx = index(i, j, k);
  DEBUG_ONLY(checkIndex(idx - mStrideZ));
  DEBUG_ONLY(checkIndex(idx + mSize.x - mStrideZ));
  Vec3 v = Vec3(0.25 * (mData[idx].x + mData[idx - mStrideZ].x + mData[idx + 1].x +
                        mData[idx + 1 - mStrideZ].x),
                0.25 * (mData[idx].y + mData[idx - mStrideZ].y + mData[idx + mSize.x].y +
                        mData[idx + mSize.x - mStrideZ].y),
                (mData[idx].z));
  return v;
}

template<class T, class S> struct gridAdd : public KernelBase {
  gridAdd(Grid<T> &me, const Grid<S> &other) : KernelBase(&me, 0), me(me), other(other)
  {
    runMessage();
    run();
  }
  inline void op(IndexInt idx, Grid<T> &me, const Grid<S> &other) const
  {
    me[idx] += other[idx];
  }
  inline Grid<T> &getArg0()
  {
    return me;
  }
  typedef Grid<T> type0;
  inline const Grid<S> &getArg1()
  {
    return other;
  }
  typedef Grid<S> type1;
  void runMessage()
  {
    debMsg("Executing kernel gridAdd ", 3);
    debMsg("Kernel range"
               << " x " << maxX << " y " << maxY << " z " << minZ << " - " << maxZ << " ",
           4);
  };
  void operator()(const tbb::blocked_range<IndexInt> &__r) const
  {
    for (IndexInt idx = __r.begin(); idx != (IndexInt)__r.end(); idx++)
      op(idx, me, other);
  }
  void run()
  {
    tbb::parallel_for(tbb::blocked_range<IndexInt>(0, size), *this);
  }
  Grid<T> &me;
  const Grid<S> &other;
};
template<class T, class S> struct gridSub : public KernelBase {
  gridSub(Grid<T> &me, const Grid<S> &other) : KernelBase(&me, 0), me(me), other(other)
  {
    runMessage();
    run();
  }
  inline void op(IndexInt idx, Grid<T> &me, const Grid<S> &other) const
  {
    me[idx] -= other[idx];
  }
  inline Grid<T> &getArg0()
  {
    return me;
  }
  typedef Grid<T> type0;
  inline const Grid<S> &getArg1()
  {
    return other;
  }
  typedef Grid<S> type1;
  void runMessage()
  {
    debMsg("Executing kernel gridSub ", 3);
    debMsg("Kernel range"
               << " x " << maxX << " y " << maxY << " z " << minZ << " - " << maxZ << " ",
           4);
  };
  void operator()(const tbb::blocked_range<IndexInt> &__r) const
  {
    for (IndexInt idx = __r.begin(); idx != (IndexInt)__r.end(); idx++)
      op(idx, me, other);
  }
  void run()
  {
    tbb::parallel_for(tbb::blocked_range<IndexInt>(0, size), *this);
  }
  Grid<T> &me;
  const Grid<S> &other;
};
template<class T, class S> struct gridMult : public KernelBase {
  gridMult(Grid<T> &me, const Grid<S> &other) : KernelBase(&me, 0), me(me), other(other)
  {
    runMessage();
    run();
  }
  inline void op(IndexInt idx, Grid<T> &me, const Grid<S> &other) const
  {
    me[idx] *= other[idx];
  }
  inline Grid<T> &getArg0()
  {
    return me;
  }
  typedef Grid<T> type0;
  inline const Grid<S> &getArg1()
  {
    return other;
  }
  typedef Grid<S> type1;
  void runMessage()
  {
    debMsg("Executing kernel gridMult ", 3);
    debMsg("Kernel range"
               << " x " << maxX << " y " << maxY << " z " << minZ << " - " << maxZ << " ",
           4);
  };
  void operator()(const tbb::blocked_range<IndexInt> &__r) const
  {
    for (IndexInt idx = __r.begin(); idx != (IndexInt)__r.end(); idx++)
      op(idx, me, other);
  }
  void run()
  {
    tbb::parallel_for(tbb::blocked_range<IndexInt>(0, size), *this);
  }
  Grid<T> &me;
  const Grid<S> &other;
};
template<class T, class S> struct gridDiv : public KernelBase {
  gridDiv(Grid<T> &me, const Grid<S> &other) : KernelBase(&me, 0), me(me), other(other)
  {
    runMessage();
    run();
  }
  inline void op(IndexInt idx, Grid<T> &me, const Grid<S> &other) const
  {
    me[idx] /= other[idx];
  }
  inline Grid<T> &getArg0()
  {
    return me;
  }
  typedef Grid<T> type0;
  inline const Grid<S> &getArg1()
  {
    return other;
  }
  typedef Grid<S> type1;
  void runMessage()
  {
    debMsg("Executing kernel gridDiv ", 3);
    debMsg("Kernel range"
               << " x " << maxX << " y " << maxY << " z " << minZ << " - " << maxZ << " ",
           4);
  };
  void operator()(const tbb::blocked_range<IndexInt> &__r) const
  {
    for (IndexInt idx = __r.begin(); idx != (IndexInt)__r.end(); idx++)
      op(idx, me, other);
  }
  void run()
  {
    tbb::parallel_for(tbb::blocked_range<IndexInt>(0, size), *this);
  }
  Grid<T> &me;
  const Grid<S> &other;
};
template<class T, class S> struct gridAddScalar : public KernelBase {
  gridAddScalar(Grid<T> &me, const S &other) : KernelBase(&me, 0), me(me), other(other)
  {
    runMessage();
    run();
  }
  inline void op(IndexInt idx, Grid<T> &me, const S &other) const
  {
    me[idx] += other;
  }
  inline Grid<T> &getArg0()
  {
    return me;
  }
  typedef Grid<T> type0;
  inline const S &getArg1()
  {
    return other;
  }
  typedef S type1;
  void runMessage()
  {
    debMsg("Executing kernel gridAddScalar ", 3);
    debMsg("Kernel range"
               << " x " << maxX << " y " << maxY << " z " << minZ << " - " << maxZ << " ",
           4);
  };
  void operator()(const tbb::blocked_range<IndexInt> &__r) const
  {
    for (IndexInt idx = __r.begin(); idx != (IndexInt)__r.end(); idx++)
      op(idx, me, other);
  }
  void run()
  {
    tbb::parallel_for(tbb::blocked_range<IndexInt>(0, size), *this);
  }
  Grid<T> &me;
  const S &other;
};
template<class T, class S> struct gridMultScalar : public KernelBase {
  gridMultScalar(Grid<T> &me, const S &other) : KernelBase(&me, 0), me(me), other(other)
  {
    runMessage();
    run();
  }
  inline void op(IndexInt idx, Grid<T> &me, const S &other) const
  {
    me[idx] *= other;
  }
  inline Grid<T> &getArg0()
  {
    return me;
  }
  typedef Grid<T> type0;
  inline const S &getArg1()
  {
    return other;
  }
  typedef S type1;
  void runMessage()
  {
    debMsg("Executing kernel gridMultScalar ", 3);
    debMsg("Kernel range"
               << " x " << maxX << " y " << maxY << " z " << minZ << " - " << maxZ << " ",
           4);
  };
  void operator()(const tbb::blocked_range<IndexInt> &__r) const
  {
    for (IndexInt idx = __r.begin(); idx != (IndexInt)__r.end(); idx++)
      op(idx, me, other);
  }
  void run()
  {
    tbb::parallel_for(tbb::blocked_range<IndexInt>(0, size), *this);
  }
  Grid<T> &me;
  const S &other;
};
template<class T, class S> struct gridScaledAdd : public KernelBase {
  gridScaledAdd(Grid<T> &me, const Grid<T> &other, const S &factor)
      : KernelBase(&me, 0), me(me), other(other), factor(factor)
  {
    runMessage();
    run();
  }
  inline void op(IndexInt idx, Grid<T> &me, const Grid<T> &other, const S &factor) const
  {
    me[idx] += factor * other[idx];
  }
  inline Grid<T> &getArg0()
  {
    return me;
  }
  typedef Grid<T> type0;
  inline const Grid<T> &getArg1()
  {
    return other;
  }
  typedef Grid<T> type1;
  inline const S &getArg2()
  {
    return factor;
  }
  typedef S type2;
  void runMessage()
  {
    debMsg("Executing kernel gridScaledAdd ", 3);
    debMsg("Kernel range"
               << " x " << maxX << " y " << maxY << " z " << minZ << " - " << maxZ << " ",
           4);
  };
  void operator()(const tbb::blocked_range<IndexInt> &__r) const
  {
    for (IndexInt idx = __r.begin(); idx != (IndexInt)__r.end(); idx++)
      op(idx, me, other, factor);
  }
  void run()
  {
    tbb::parallel_for(tbb::blocked_range<IndexInt>(0, size), *this);
  }
  Grid<T> &me;
  const Grid<T> &other;
  const S &factor;
};

template<class T> struct gridSetConst : public KernelBase {
  gridSetConst(Grid<T> &grid, T value) : KernelBase(&grid, 0), grid(grid), value(value)
  {
    runMessage();
    run();
  }
  inline void op(IndexInt idx, Grid<T> &grid, T value) const
  {
    grid[idx] = value;
  }
  inline Grid<T> &getArg0()
  {
    return grid;
  }
  typedef Grid<T> type0;
  inline T &getArg1()
  {
    return value;
  }
  typedef T type1;
  void runMessage()
  {
    debMsg("Executing kernel gridSetConst ", 3);
    debMsg("Kernel range"
               << " x " << maxX << " y " << maxY << " z " << minZ << " - " << maxZ << " ",
           4);
  };
  void operator()(const tbb::blocked_range<IndexInt> &__r) const
  {
    for (IndexInt idx = __r.begin(); idx != (IndexInt)__r.end(); idx++)
      op(idx, grid, value);
  }
  void run()
  {
    tbb::parallel_for(tbb::blocked_range<IndexInt>(0, size), *this);
  }
  Grid<T> &grid;
  T value;
};

template<class T> template<class S> Grid<T> &Grid<T>::operator+=(const Grid<S> &a)
{
  gridAdd<T, S>(*this, a);
  return *this;
}
template<class T> template<class S> Grid<T> &Grid<T>::operator+=(const S &a)
{
  gridAddScalar<T, S>(*this, a);
  return *this;
}
template<class T> template<class S> Grid<T> &Grid<T>::operator-=(const Grid<S> &a)
{
  gridSub<T, S>(*this, a);
  return *this;
}
template<class T> template<class S> Grid<T> &Grid<T>::operator-=(const S &a)
{
  gridAddScalar<T, S>(*this, -a);
  return *this;
}
template<class T> template<class S> Grid<T> &Grid<T>::operator*=(const Grid<S> &a)
{
  gridMult<T, S>(*this, a);
  return *this;
}
template<class T> template<class S> Grid<T> &Grid<T>::operator*=(const S &a)
{
  gridMultScalar<T, S>(*this, a);
  return *this;
}
template<class T> template<class S> Grid<T> &Grid<T>::operator/=(const Grid<S> &a)
{
  gridDiv<T, S>(*this, a);
  return *this;
}
template<class T> template<class S> Grid<T> &Grid<T>::operator/=(const S &a)
{
  S rez((S)1.0 / a);
  gridMultScalar<T, S>(*this, rez);
  return *this;
}

//******************************************************************************
// Other helper functions

// compute gradient of a scalar grid
inline Vec3 getGradient(const Grid<Real> &data, int i, int j, int k)
{
  Vec3 v;

  if (i > data.getSizeX() - 2)
    i = data.getSizeX() - 2;
  if (j > data.getSizeY() - 2)
    j = data.getSizeY() - 2;
  if (i < 1)
    i = 1;
  if (j < 1)
    j = 1;
  v = Vec3(data(i + 1, j, k) - data(i - 1, j, k), data(i, j + 1, k) - data(i, j - 1, k), 0.);

  if (data.is3D()) {
    if (k > data.getSizeZ() - 2)
      k = data.getSizeZ() - 2;
    if (k < 1)
      k = 1;
    v[2] = data(i, j, k + 1) - data(i, j, k - 1);
  }

  return v;
}

// interpolate grid from one size to another size

template<class S> struct knInterpolateGridTempl : public KernelBase {
  knInterpolateGridTempl(Grid<S> &target,
                         const Grid<S> &source,
                         const Vec3 &sourceFactor,
                         Vec3 offset,
                         int orderSpace = 1)
      : KernelBase(&target, 0),
        target(target),
        source(source),
        sourceFactor(sourceFactor),
        offset(offset),
        orderSpace(orderSpace)
  {
    runMessage();
    run();
  }
  inline void op(int i,
                 int j,
                 int k,
                 Grid<S> &target,
                 const Grid<S> &source,
                 const Vec3 &sourceFactor,
                 Vec3 offset,
                 int orderSpace = 1) const
  {
    Vec3 pos = Vec3(i, j, k) * sourceFactor + offset;
    if (!source.is3D())
      pos[2] = 0;  // allow 2d -> 3d
    target(i, j, k) = source.getInterpolatedHi(pos, orderSpace);
  }
  inline Grid<S> &getArg0()
  {
    return target;
  }
  typedef Grid<S> type0;
  inline const Grid<S> &getArg1()
  {
    return source;
  }
  typedef Grid<S> type1;
  inline const Vec3 &getArg2()
  {
    return sourceFactor;
  }
  typedef Vec3 type2;
  inline Vec3 &getArg3()
  {
    return offset;
  }
  typedef Vec3 type3;
  inline int &getArg4()
  {
    return orderSpace;
  }
  typedef int type4;
  void runMessage()
  {
    debMsg("Executing kernel knInterpolateGridTempl ", 3);
    debMsg("Kernel range"
               << " x " << maxX << " y " << maxY << " z " << minZ << " - " << maxZ << " ",
           4);
  };
  void operator()(const tbb::blocked_range<IndexInt> &__r) const
  {
    const int _maxX = maxX;
    const int _maxY = maxY;
    if (maxZ > 1) {
      for (int k = __r.begin(); k != (int)__r.end(); k++)
        for (int j = 0; j < _maxY; j++)
          for (int i = 0; i < _maxX; i++)
            op(i, j, k, target, source, sourceFactor, offset, orderSpace);
    }
    else {
      const int k = 0;
      for (int j = __r.begin(); j != (int)__r.end(); j++)
        for (int i = 0; i < _maxX; i++)
          op(i, j, k, target, source, sourceFactor, offset, orderSpace);
    }
  }
  void run()
  {
    if (maxZ > 1)
      tbb::parallel_for(tbb::blocked_range<IndexInt>(minZ, maxZ), *this);
    else
      tbb::parallel_for(tbb::blocked_range<IndexInt>(0, maxY), *this);
  }
  Grid<S> &target;
  const Grid<S> &source;
  const Vec3 &sourceFactor;
  Vec3 offset;
  int orderSpace;
};
// template glue code - choose interpolation based on template arguments
template<class GRID> void interpolGridTempl(GRID &target, GRID &source)
{
  errMsg("interpolGridTempl - Only valid for specific instantiations");
}

}  // namespace Manta
#endif
