There is a maintenance of MPCDF Gitlab on Thursday, April 22st 2020, 9:00 am CEST - Expect some service interruptions during this time

gridder_cxx.h 52.4 KB
Newer Older
Martin Reinecke's avatar
Martin Reinecke committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
#ifndef GRIDDER_CXX_H
#define GRIDDER_CXX_H

/*
 *  This file is part of nifty_gridder.
 *
 *  nifty_gridder is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  nifty_gridder is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with nifty_gridder; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

/* Copyright (C) 2019 Max-Planck-Society
   Author: Martin Reinecke */

#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <cmath>
#include <vector>
Martin Reinecke's avatar
Martin Reinecke committed
30
#include <array>
Martin Reinecke's avatar
Martin Reinecke committed
31

Martin Reinecke's avatar
Martin Reinecke committed
32 33 34 35
#ifdef _OPENMP
#include <omp.h>
#endif

Martin Reinecke's avatar
Martin Reinecke committed
36
#include "pocketfft_hdronly.h"
Martin Reinecke's avatar
Martin Reinecke committed
37 38

#if defined(__GNUC__)
Martin Reinecke's avatar
tweaks  
Martin Reinecke committed
39
#define NOINLINE __attribute__((noinline))
Martin Reinecke's avatar
Martin Reinecke committed
40
#define ALIGNED(align) __attribute__ ((aligned(align)))
Martin Reinecke's avatar
Martin Reinecke committed
41
#define RESTRICT __restrict__
Martin Reinecke's avatar
Martin Reinecke committed
42 43 44
#else
#define NOINLINE
#define ALIGNED(align)
Martin Reinecke's avatar
Martin Reinecke committed
45
#define RESTRICT
Martin Reinecke's avatar
Martin Reinecke committed
46
#endif
Martin Reinecke's avatar
Martin Reinecke committed
47

Martin Reinecke's avatar
Martin Reinecke committed
48 49
namespace gridder {

50 51
namespace detail {

Martin Reinecke's avatar
Martin Reinecke committed
52 53
using namespace std;

54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
template<typename T> struct VLEN { static constexpr size_t val=1; };

#if (defined(__AVX512F__))
template<> struct VLEN<float> { static constexpr size_t val=16; };
template<> struct VLEN<double> { static constexpr size_t val=8; };
#elif (defined(__AVX__))
template<> struct VLEN<float> { static constexpr size_t val=8; };
template<> struct VLEN<double> { static constexpr size_t val=4; };
#elif (defined(__SSE2__))
template<> struct VLEN<float> { static constexpr size_t val=4; };
template<> struct VLEN<double> { static constexpr size_t val=2; };
#elif (defined(__VSX__))
template<> struct VLEN<float> { static constexpr size_t val=4; };
template<> struct VLEN<double> { static constexpr size_t val=2; };
#endif

Martin Reinecke's avatar
Martin Reinecke committed
70 71

// "mav" stands for "multidimensional array view"
Martin Reinecke's avatar
Martin Reinecke committed
72
template<typename T, size_t ndim> class mav
Martin Reinecke's avatar
Martin Reinecke committed
73 74 75 76 77
  {
  static_assert((ndim>0) && (ndim<3), "only supports 1D and 2D arrays");

  private:
    T *d;
Martin Reinecke's avatar
Martin Reinecke committed
78 79
    array<size_t, ndim> shp;
    array<ptrdiff_t, ndim> str;
Martin Reinecke's avatar
Martin Reinecke committed
80 81

  public:
Martin Reinecke's avatar
Martin Reinecke committed
82 83 84 85
    mav(T *d_, const array<size_t,ndim> &shp_,
        const array<ptrdiff_t,ndim> &str_)
      : d(d_), shp(shp_), str(str_) {}
    mav(T *d_, const array<size_t,ndim> &shp_)
Martin Reinecke's avatar
Martin Reinecke committed
86 87 88 89 90 91
      : d(d_), shp(shp_)
      {
      str[ndim-1]=1;
      for (size_t d=2; d<=ndim; ++d)
        str[ndim-d] = str[ndim-d+1]*shp[ndim-d+1];
      }
92
    T &operator[](size_t i) const
Martin Reinecke's avatar
Martin Reinecke committed
93
      { return operator()(i); }
94
    T &operator()(size_t i) const
Martin Reinecke's avatar
Martin Reinecke committed
95 96
      {
      static_assert(ndim==1, "ndim must be 1");
Martin Reinecke's avatar
Martin Reinecke committed
97
      return d[str[0]*i];
Martin Reinecke's avatar
Martin Reinecke committed
98
      }
99
    T &operator()(size_t i, size_t j) const
Martin Reinecke's avatar
Martin Reinecke committed
100 101
      {
      static_assert(ndim==2, "ndim must be 2");
Martin Reinecke's avatar
Martin Reinecke committed
102
      return d[str[0]*i + str[1]*j];
Martin Reinecke's avatar
Martin Reinecke committed
103 104
      }
    size_t shape(size_t i) const { return shp[i]; }
Martin Reinecke's avatar
Martin Reinecke committed
105
    const array<size_t,ndim> &shape() const { return shp; }
Martin Reinecke's avatar
Martin Reinecke committed
106 107 108 109 110 111
    size_t size() const
      {
      size_t res=1;
      for (auto v: shp) res*=v;
      return res;
      }
Martin Reinecke's avatar
cleanup  
Martin Reinecke committed
112
    ptrdiff_t stride(size_t i) const { return str[i]; }
113
    T *data() const
Martin Reinecke's avatar
Martin Reinecke committed
114
      { return d; }
Martin Reinecke's avatar
updates  
Martin Reinecke committed
115 116 117 118 119 120 121 122 123 124
    bool contiguous() const
      {
      ptrdiff_t stride=1;
      for (size_t i=0; i<ndim; ++i)
        {
        if (str[ndim-1-i]!=stride) return false;
        stride *= shp[ndim-1-i];
        }
      return true;
      }
Martin Reinecke's avatar
Martin Reinecke committed
125 126
    void fill(const T &val) const
      {
Martin Reinecke's avatar
Martin Reinecke committed
127
      // FIXME: special cases for contiguous arrays and/or zeroing?
Martin Reinecke's avatar
Martin Reinecke committed
128 129 130 131 132 133 134 135
      if (ndim==1)
        for (size_t i=0; i<shp[0]; ++i)
          d[str[0]*i]=val;
      else if (ndim==2)
        for (size_t i=0; i<shp[0]; ++i)
          for (size_t j=0; j<shp[1]; ++j)
            d[str[0]*i + str[1]*j] = val;
      }
Martin Reinecke's avatar
Martin Reinecke committed
136 137
  };

Martin Reinecke's avatar
updates  
Martin Reinecke committed
138
template<typename T, size_t ndim> using const_mav = mav<const T, ndim>;
Martin Reinecke's avatar
Martin Reinecke committed
139 140 141 142 143 144 145 146
template<typename T, size_t ndim> const_mav<T, ndim> cmav (const mav<T, ndim> &mav)
  { return const_mav<T, ndim>(mav.data(), mav.shape()); }
template<typename T, size_t ndim> const_mav<T, ndim> nullmav()
  {
  array<size_t,ndim> shp;
  shp.fill(0);
  return const_mav<T, ndim>(nullptr, shp);
  }
Martin Reinecke's avatar
Martin Reinecke committed
147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162
template<typename T, size_t ndim> class tmpStorage
  {
  private:
    vector<T> d;
    mav<T,ndim> mav_;

    static size_t prod(const array<size_t,ndim> &shp)
      {
      size_t res=1;
      for (auto v: shp) res*=v;
      return res;
      }

  public:
    tmpStorage(const array<size_t,ndim> &shp)
      : d(prod(shp)), mav_(d.data(), shp) {}
Martin Reinecke's avatar
Martin Reinecke committed
163 164
    mav<T,ndim> &getMav() { return mav_; }
    const_mav<T,ndim> getCmav() { return cmav(mav_); }
Martin Reinecke's avatar
Martin Reinecke committed
165 166 167
    void fill(const T & val)
      { std::fill(d.begin(), d.end(), val); }
  };
Martin Reinecke's avatar
Martin Reinecke committed
168

Martin Reinecke's avatar
Martin Reinecke committed
169 170 171
//
// basic utilities
//
Martin Reinecke's avatar
Martin Reinecke committed
172 173 174 175 176
#if defined (__GNUC__)
#define LOC_ CodeLocation(__FILE__, __LINE__, __PRETTY_FUNCTION__)
#else
#define LOC_ CodeLocation(__FILE__, __LINE__)
#endif
Martin Reinecke's avatar
Martin Reinecke committed
177

Martin Reinecke's avatar
Martin Reinecke committed
178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197
#define myfail(...) \
  do { \
    std::ostringstream os; \
    streamDump__(os, LOC_, "\n", ##__VA_ARGS__, "\n"); \
    throw std::runtime_error(os.str()); \
    } while(0)

#define myassert(cond,...) \
  do { \
    if (cond); \
    else { myfail("Assertion failure\n", ##__VA_ARGS__); } \
    } while(0)

template<typename T>
inline void streamDump__(std::ostream &os, const T& value)
  { os << value; }

template<typename T, typename ... Args>
inline void streamDump__(std::ostream &os, const T& value,
  const Args& ... args)
Martin Reinecke's avatar
Martin Reinecke committed
198
  {
Martin Reinecke's avatar
Martin Reinecke committed
199 200
  os << value;
  streamDump__(os, args...);
Martin Reinecke's avatar
Martin Reinecke committed
201
  }
Martin Reinecke's avatar
Martin Reinecke committed
202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222
// to be replaced with std::source_location once available
class CodeLocation
  {
  private:
    const char *file, *func;
    int line;

  public:
    CodeLocation(const char *file_, int line_, const char *func_=nullptr)
      : file(file_), func(func_), line(line_) {}

    ostream &print(ostream &os) const
      {
      os << "file: " << file <<  ", line: " <<  line;
      if (func) os << ", function: " << func;
      return os;
      }
  };

inline std::ostream &operator<<(std::ostream &os, const CodeLocation &loc)
  { return loc.print(os); }
Martin Reinecke's avatar
Martin Reinecke committed
223 224

template<size_t ndim> void checkShape
Martin Reinecke's avatar
Martin Reinecke committed
225
  (const array<size_t, ndim> &shp1, const array<size_t, ndim> &shp2)
Martin Reinecke's avatar
Martin Reinecke committed
226 227 228 229 230
  {
  for (size_t i=0; i<ndim; ++i)
    myassert(shp1[i]==shp2[i], "shape mismatch");
  }

Martin Reinecke's avatar
Martin Reinecke committed
231 232
template<typename T> inline T fmod1 (T v)
  { return v-floor(v); }
Martin Reinecke's avatar
Martin Reinecke committed
233 234 235 236 237 238 239 240

//
// Utilities for Gauss-Legendre quadrature
//

static inline double one_minus_x2 (double x)
  { return (fabs(x)>0.1) ? (1.+x)*(1.-x) : 1.-x*x; }

Martin Reinecke's avatar
Martin Reinecke committed
241
void legendre_prep(int n, vector<double> &x, vector<double> &w, size_t nthreads)
Martin Reinecke's avatar
Martin Reinecke committed
242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298
  {
  constexpr double pi = 3.141592653589793238462643383279502884197;
  constexpr double eps = 3e-14;
  int m = (n+1)>>1;
  x.resize(m);
  w.resize(m);

  double t0 = 1 - (1-1./n) / (8.*n*n);
  double t1 = 1./(4.*n+2.);

#pragma omp parallel num_threads(nthreads)
{
  int i;
#pragma omp for schedule(dynamic,100)
  for (i=1; i<=m; ++i)
    {
    double x0 = cos(pi * ((i<<2)-1) * t1) * t0;

    int dobreak=0;
    int j=0;
    double dpdx;
    while(1)
      {
      double P_1 = 1.0;
      double P0 = x0;
      double dx, x1;

      for (int k=2; k<=n; k++)
        {
        double P_2 = P_1;
        P_1 = P0;
//        P0 = ((2*k-1)*x0*P_1-(k-1)*P_2)/k;
        P0 = x0*P_1 + (k-1.)/k * (x0*P_1-P_2);
        }

      dpdx = (P_1 - x0*P0) * n / one_minus_x2(x0);

      /* Newton step */
      x1 = x0 - P0/dpdx;
      dx = x0-x1;
      x0 = x1;
      if (dobreak) break;

      if (abs(dx)<=eps) dobreak=1;
      myassert(++j<100, "convergence problem");
      }

    x[m-i] = x0;
    w[m-i] = 2. / (one_minus_x2(x0) * dpdx * dpdx);
    }
} // end of parallel region
  }

//
// Start of real gridder functionality
//

299 300 301
template<typename T> void complex2hartley
  (const const_mav<complex<T>, 2> &grid, const mav<T,2> &grid2, size_t nthreads)
  {
Martin Reinecke's avatar
Martin Reinecke committed
302
  checkShape(grid.shape(), grid2.shape());
303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320
  size_t nu=grid.shape(0), nv=grid.shape(1);

#pragma omp parallel for num_threads(nthreads)
  for (size_t u=0; u<nu; ++u)
    {
    size_t xu = (u==0) ? 0 : nu-u;
    for (size_t v=0; v<nv; ++v)
      {
      size_t xv = (v==0) ? 0 : nv-v;
      grid2(u,v) += T(0.5)*(grid( u, v).real()+grid( u, v).imag()+
                            grid(xu,xv).real()-grid(xu,xv).imag());
      }
    }
  }

template<typename T> void hartley2complex
  (const const_mav<T,2> &grid, const mav<complex<T>,2> &grid2, size_t nthreads)
  {
Martin Reinecke's avatar
Martin Reinecke committed
321
  checkShape(grid.shape(), grid2.shape());
322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337
  size_t nu=grid.shape(0), nv=grid.shape(1);

#pragma omp parallel for num_threads(nthreads)
  for (size_t u=0; u<nu; ++u)
    {
    size_t xu = (u==0) ? 0 : nu-u;
    for (size_t v=0; v<nv; ++v)
      {
      size_t xv = (v==0) ? 0 : nv-v;
      T v1 = T(0.5)*grid( u, v);
      T v2 = T(0.5)*grid(xu,xv);
      grid2(u,v) = std::complex<T>(v1+v2, v1-v2);
      }
    }
  }

Martin Reinecke's avatar
Martin Reinecke committed
338 339
template<typename T> void hartley2_2D(const const_mav<T,2> &in,
  const mav<T,2> &out, size_t nthreads)
340
  {
Martin Reinecke's avatar
Martin Reinecke committed
341
  checkShape(in.shape(), out.shape());
342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365
  size_t nu=in.shape(0), nv=in.shape(1);
  ptrdiff_t sz=ptrdiff_t(sizeof(T));
  pocketfft::stride_t stri{sz*in.stride(0), sz*in.stride(1)};
  pocketfft::stride_t stro{sz*out.stride(0), sz*out.stride(1)};
  auto d_i = in.data();
  auto ptmp = out.data();
  pocketfft::r2r_separable_hartley({nu, nv}, stri, stro, {0,1}, d_i, ptmp, T(1),
    nthreads);
#pragma omp parallel for num_threads(nthreads)
  for(size_t i=1; i<(nu+1)/2; ++i)
    for(size_t j=1; j<(nv+1)/2; ++j)
       {
       T a = ptmp[i*nv+j];
       T b = ptmp[(nu-i)*nv+j];
       T c = ptmp[i*nv+nv-j];
       T d = ptmp[(nu-i)*nv+nv-j];
       ptmp[i*nv+j] = T(0.5)*(a+b+c-d);
       ptmp[(nu-i)*nv+j] = T(0.5)*(a+b+d-c);
       ptmp[i*nv+nv-j] = T(0.5)*(a+c+d-b);
       ptmp[(nu-i)*nv+nv-j] = T(0.5)*(b+c+d-a);
       }
  }


Martin Reinecke's avatar
Martin Reinecke committed
366
class ES_Kernel
Martin Reinecke's avatar
Martin Reinecke committed
367
  {
Martin Reinecke's avatar
Martin Reinecke committed
368
  private:
Martin Reinecke's avatar
Martin Reinecke committed
369
    static constexpr double pi = 3.141592653589793238462643383279502884197;
Martin Reinecke's avatar
Martin Reinecke committed
370
    double beta;
Martin Reinecke's avatar
Martin Reinecke committed
371
    int p;
372
    vector<double> x, wgt, psi;
Martin Reinecke's avatar
Martin Reinecke committed
373
    size_t supp;
Martin Reinecke's avatar
Martin Reinecke committed
374 375

  public:
Martin Reinecke's avatar
Martin Reinecke committed
376
    ES_Kernel(size_t supp_, size_t nthreads)
377
      : beta(get_beta(supp_)*supp_), p(int(1.5*supp_+2)), supp(supp_)
Martin Reinecke's avatar
Martin Reinecke committed
378
      {
Martin Reinecke's avatar
Martin Reinecke committed
379
      legendre_prep(2*p,x,wgt,nthreads);
Martin Reinecke's avatar
Martin Reinecke committed
380 381 382 383
      psi=x;
      for (auto &v:psi)
        v=operator()(v);
      }
Martin Reinecke's avatar
Martin Reinecke committed
384
    double operator()(double v) const { return exp(beta*(sqrt(1.-v*v)-1.)); }
Martin Reinecke's avatar
Martin Reinecke committed
385 386
    /* Compute correction factors for the ES gridding kernel
       This implementation follows eqs. (3.8) to (3.10) of Barnett et al. 2018 */
Martin Reinecke's avatar
Martin Reinecke committed
387
    double corfac(double v) const
Martin Reinecke's avatar
Martin Reinecke committed
388
      {
Martin Reinecke's avatar
Martin Reinecke committed
389
      double tmp=0;
Martin Reinecke's avatar
Martin Reinecke committed
390 391
      for (int i=0; i<p; ++i)
        tmp += wgt[i]*psi[i]*cos(pi*supp*v*x[i]);
Martin Reinecke's avatar
Martin Reinecke committed
392
      return 1./(supp*tmp);
Martin Reinecke's avatar
Martin Reinecke committed
393
      }
394 395 396 397 398 399 400 401
    static double get_beta(size_t supp)
      {
      static const vector<double> opt_beta {-1, 0.14, 1.70, 2.08, 2.205, 2.26,
        2.29, 2.307, 2.316, 2.3265, 2.3324, 2.282, 2.294, 2.304, 2.3138, 2.317};
      myassert(supp<opt_beta.size(), "bad support size");
      return opt_beta[supp];
      }

Martin Reinecke's avatar
Martin Reinecke committed
402 403
    static size_t get_supp(double epsilon)
      {
404 405 406
      static const vector<double> maxmaperr { 1e8, 0.19, 2.98e-3, 5.98e-5,
        1.11e-6, 2.01e-8, 3.55e-10, 5.31e-12, 8.81e-14, 1.34e-15, 2.17e-17,
        2.12e-19, 2.88e-21, 3.92e-23, 8.21e-25, 7.13e-27 };
Martin Reinecke's avatar
Martin Reinecke committed
407 408 409 410
      double epssq = epsilon*epsilon;

      for (size_t i=1; i<maxmaperr.size(); ++i)
        if (epssq>maxmaperr[i]) return i;
411
      myfail("requested epsilon too small - minimum is 1e-13");
Martin Reinecke's avatar
Martin Reinecke committed
412
      }
Martin Reinecke's avatar
Martin Reinecke committed
413
  };
Martin Reinecke's avatar
Martin Reinecke committed
414

Martin Reinecke's avatar
Martin Reinecke committed
415 416
/* Compute correction factors for the ES gridding kernel
   This implementation follows eqs. (3.8) to (3.10) of Barnett et al. 2018 */
Martin Reinecke's avatar
Martin Reinecke committed
417
vector<double> correction_factors(size_t n, size_t nval, size_t supp,
Martin Reinecke's avatar
Martin Reinecke committed
418
  size_t nthreads)
Martin Reinecke's avatar
Martin Reinecke committed
419
  {
Martin Reinecke's avatar
Martin Reinecke committed
420
  ES_Kernel kernel(supp, nthreads);
Martin Reinecke's avatar
Martin Reinecke committed
421
  vector<double> res(nval);
Martin Reinecke's avatar
Martin Reinecke committed
422 423 424 425 426 427 428
  double xn = 1./n;
#pragma omp parallel for schedule(static) num_threads(nthreads)
  for (size_t k=0; k<nval; ++k)
    res[k] = kernel.corfac(k*xn);
  return res;
  }

429 430 431 432 433 434 435
using idx_t = uint32_t;

struct RowChan
  {
  idx_t row, chan;
  };

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
436
struct UVW
Martin Reinecke's avatar
Martin Reinecke committed
437
  {
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
438 439 440 441
  double u, v, w;
  UVW() {}
  UVW(double u_, double v_, double w_) : u(u_), v(v_), w(w_) {}
  UVW operator* (double fct) const
Martin Reinecke's avatar
Martin Reinecke committed
442
    { return UVW(u*fct, v*fct, w*fct); }
443 444 445 446 447 448 449
  void Flip() { u=-u; v=-v; w=-w; }
  bool FixW()
    {
    bool flip = w<0;
    if (flip) Flip();
    return flip;
    }
Martin Reinecke's avatar
Martin Reinecke committed
450 451
  };

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
452
class Baselines
Martin Reinecke's avatar
Martin Reinecke committed
453 454
  {
  protected:
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
455 456
    vector<UVW> coord;
    vector<double> f_over_c;
457 458
    idx_t nrows, nchan;
    idx_t shift, mask;
Martin Reinecke's avatar
Martin Reinecke committed
459 460

  public:
Martin Reinecke's avatar
Martin Reinecke committed
461 462
    template<typename T> Baselines(const const_mav<T,2> &coord_,
      const const_mav<T,1> &freq)
Martin Reinecke's avatar
Martin Reinecke committed
463 464 465
      {
      constexpr double speedOfLight = 299792458.;
      myassert(coord_.shape(1)==3, "dimension mismatch");
466 467 468 469
      auto hugeval = size_t(~(idx_t(0)));
      myassert(coord_.shape(0)<hugeval, "too many entries in MS");
      myassert(coord_.shape(1)<hugeval, "too many entries in MS");
      myassert(coord_.size()<hugeval, "too many entries in MS");
Martin Reinecke's avatar
Martin Reinecke committed
470 471
      nrows = coord_.shape(0);
      nchan = freq.shape(0);
472
      shift=0;
473 474
      while((idx_t(1)<<shift)<nchan) ++shift;
      mask=(idx_t(1)<<shift)-1;
Martin Reinecke's avatar
Martin Reinecke committed
475
      myassert(nrows*(mask+1)<hugeval, "too many entries in MS");
Martin Reinecke's avatar
Martin Reinecke committed
476 477
      f_over_c.resize(nchan);
      for (size_t i=0; i<nchan; ++i)
478 479
        {
        myassert(freq[i]>0, "negative channel frequency encountered");
Martin Reinecke's avatar
Martin Reinecke committed
480
        f_over_c[i] = freq(i)/speedOfLight;
481
        }
Martin Reinecke's avatar
Martin Reinecke committed
482 483
      coord.resize(nrows);
      for (size_t i=0; i<coord.size(); ++i)
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
484
        coord[i] = UVW(coord_(i,0), coord_(i,1), coord_(i,2));
Martin Reinecke's avatar
Martin Reinecke committed
485 486
      }

487
    RowChan getRowChan(idx_t index) const
488
      { return RowChan{index>>shift, index&mask}; }
Martin Reinecke's avatar
Martin Reinecke committed
489

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
490
    UVW effectiveCoord(const RowChan &rc) const
Martin Reinecke's avatar
Martin Reinecke committed
491
      { return coord[rc.row]*f_over_c[rc.chan]; }
492
    UVW effectiveCoord(idx_t index) const
Martin Reinecke's avatar
Martin Reinecke committed
493
      { return effectiveCoord(getRowChan(index)); }
Martin Reinecke's avatar
Martin Reinecke committed
494 495
    size_t Nrows() const { return nrows; }
    size_t Nchannels() const { return nchan; }
496
    idx_t getIdx(idx_t irow, idx_t ichan) const
497
      { return ichan+(irow<<shift); }
Martin Reinecke's avatar
Martin Reinecke committed
498

499
    template<typename T> void effectiveUVW(const mav<const idx_t,1> &idx,
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
500
      mav<T,2> &res) const
Martin Reinecke's avatar
Martin Reinecke committed
501 502
      {
      size_t nvis = idx.shape(0);
Martin Reinecke's avatar
Martin Reinecke committed
503
      checkShape(res.shape(), {idx.shape(0), 3});
Martin Reinecke's avatar
Martin Reinecke committed
504 505 506 507 508 509 510 511 512
      for (size_t i=0; i<nvis; i++)
        {
        auto uvw = effectiveCoord(idx(i));
        res(i,0) = uvw.u;
        res(i,1) = uvw.v;
        res(i,2) = uvw.w;
        }
      }

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
513
    template<typename T> void ms2vis(const mav<const T,2> &ms,
514
      const mav<const idx_t,1> &idx, mav<T,1> &vis, size_t nthreads) const
Martin Reinecke's avatar
Martin Reinecke committed
515
      {
Martin Reinecke's avatar
Martin Reinecke committed
516
      checkShape(ms.shape(), {nrows, nchan});
Martin Reinecke's avatar
Martin Reinecke committed
517
      size_t nvis = idx.shape(0);
Martin Reinecke's avatar
Martin Reinecke committed
518
      checkShape(vis.shape(), {nvis});
Martin Reinecke's avatar
Martin Reinecke committed
519 520 521
#pragma omp parallel for num_threads(nthreads)
      for (size_t i=0; i<nvis; ++i)
        {
Martin Reinecke's avatar
Martin Reinecke committed
522 523
        auto rc = getRowChan(idx(i));
        vis[i] = ms(rc.row, rc.chan);
Martin Reinecke's avatar
Martin Reinecke committed
524 525 526
        }
      }

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
527
    template<typename T> void vis2ms(const mav<const T,1> &vis,
528
      const mav<const idx_t,1> &idx, mav<T,2> &ms, size_t nthreads) const
Martin Reinecke's avatar
Martin Reinecke committed
529 530
      {
      size_t nvis = vis.shape(0);
Martin Reinecke's avatar
Martin Reinecke committed
531 532
      checkShape(idx.shape(), {nvis});
      checkShape(ms.shape(), {nrows, nchan});
Martin Reinecke's avatar
Martin Reinecke committed
533 534 535
#pragma omp parallel for num_threads(nthreads)
      for (size_t i=0; i<nvis; ++i)
        {
Martin Reinecke's avatar
Martin Reinecke committed
536 537
        auto rc = getRowChan(idx(i));
        ms(rc.row, rc.chan) += vis(i);
Martin Reinecke's avatar
Martin Reinecke committed
538 539 540 541
        }
      }
  };

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
542
class GridderConfig
Martin Reinecke's avatar
Martin Reinecke committed
543 544 545
  {
  protected:
    size_t nx_dirty, ny_dirty;
Martin Reinecke's avatar
Martin Reinecke committed
546
    double eps, psx, psy;
Martin Reinecke's avatar
Martin Reinecke committed
547
    size_t supp, nsafe, nu, nv;
Martin Reinecke's avatar
Martin Reinecke committed
548 549
    double beta;
    vector<double> cfu, cfv;
Martin Reinecke's avatar
Martin Reinecke committed
550
    size_t nthreads;
Martin Reinecke's avatar
Martin Reinecke committed
551
    double ushift, vshift;
Martin Reinecke's avatar
Martin Reinecke committed
552
    int maxiu0, maxiv0;
Martin Reinecke's avatar
Martin Reinecke committed
553

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
554
    complex<double> wscreen(double x, double y, double w, bool adjoint) const
Martin Reinecke's avatar
Martin Reinecke committed
555 556
      {
      constexpr double pi = 3.141592653589793238462643383279502884197;
557 558 559
      double tmp = 1-x-y;
      if (tmp<0) return 0.;
      double nm1 = (-x-y)/(sqrt(tmp)+1); // more accurate form of sqrt(1-x-y)
Martin Reinecke's avatar
Martin Reinecke committed
560 561 562
      double n = nm1+1., xn = 1./n;
      double phase = 2*pi*w*nm1;
      if (adjoint) phase *= -1;
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
563
      return complex<double>(cos(phase)*xn, sin(phase)*xn);
Martin Reinecke's avatar
Martin Reinecke committed
564 565 566 567
      }

  public:
    GridderConfig(size_t nxdirty, size_t nydirty, double epsilon,
Martin Reinecke's avatar
Martin Reinecke committed
568
      double pixsize_x, double pixsize_y, size_t nthreads_)
Martin Reinecke's avatar
Martin Reinecke committed
569 570
      : nx_dirty(nxdirty), ny_dirty(nydirty), eps(epsilon),
        psx(pixsize_x), psy(pixsize_y),
Martin Reinecke's avatar
Martin Reinecke committed
571
        supp(ES_Kernel::get_supp(epsilon)), nsafe((supp+1)/2),
Martin Reinecke's avatar
Martin Reinecke committed
572
        nu(max(2*nsafe,2*nx_dirty)), nv(max(2*nsafe,2*ny_dirty)),
573
        beta(ES_Kernel::get_beta(supp)*supp),
Martin Reinecke's avatar
Martin Reinecke committed
574
        cfu(nx_dirty), cfv(ny_dirty), nthreads(nthreads_),
Martin Reinecke's avatar
Martin Reinecke committed
575
        ushift(supp*(-0.5)+1+nu), vshift(supp*(-0.5)+1+nv),
Martin Reinecke's avatar
Martin Reinecke committed
576
        maxiu0((nu+nsafe)-supp), maxiv0((nv+nsafe)-supp)
Martin Reinecke's avatar
Martin Reinecke committed
577 578 579 580 581 582 583
      {
      myassert((nx_dirty&1)==0, "nx_dirty must be even");
      myassert((ny_dirty&1)==0, "ny_dirty must be even");
      myassert(epsilon>0, "epsilon must be positive");
      myassert(pixsize_x>0, "pixsize_x must be positive");
      myassert(pixsize_y>0, "pixsize_y must be positive");

Martin Reinecke's avatar
Martin Reinecke committed
584
      auto tmp = correction_factors(nu, nx_dirty/2+1, supp, nthreads);
Martin Reinecke's avatar
Martin Reinecke committed
585 586 587 588
      cfu[nx_dirty/2]=tmp[0];
      cfu[0]=tmp[nx_dirty/2];
      for (size_t i=1; i<nx_dirty/2; ++i)
        cfu[nx_dirty/2-i] = cfu[nx_dirty/2+i] = tmp[i];
Martin Reinecke's avatar
Martin Reinecke committed
589
      tmp = correction_factors(nv, ny_dirty/2+1, supp, nthreads);
Martin Reinecke's avatar
Martin Reinecke committed
590 591 592 593 594 595 596 597 598 599 600 601 602 603
      cfv[ny_dirty/2]=tmp[0];
      cfv[0]=tmp[ny_dirty/2];
      for (size_t i=1; i<ny_dirty/2; ++i)
        cfv[ny_dirty/2-i] = cfv[ny_dirty/2+i] = tmp[i];
      }
    size_t Nxdirty() const { return nx_dirty; }
    size_t Nydirty() const { return ny_dirty; }
    double Epsilon() const { return eps; }
    double Pixsize_x() const { return psx; }
    double Pixsize_y() const { return psy; }
    size_t Nu() const { return nu; }
    size_t Nv() const { return nv; }
    size_t Supp() const { return supp; }
    size_t Nsafe() const { return nsafe; }
Martin Reinecke's avatar
Martin Reinecke committed
604
    double Beta() const { return beta; }
Martin Reinecke's avatar
Martin Reinecke committed
605
    size_t Nthreads() const { return nthreads; }
Martin Reinecke's avatar
Martin Reinecke committed
606

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
607
    template<typename T> void apply_taper(const mav<const T,2> &img, mav<T,2> &img2, bool divide) const
Martin Reinecke's avatar
Martin Reinecke committed
608
      {
Martin Reinecke's avatar
Martin Reinecke committed
609 610
      checkShape(img.shape(), {nx_dirty, ny_dirty});
      checkShape(img2.shape(), {nx_dirty, ny_dirty});
Martin Reinecke's avatar
Martin Reinecke committed
611 612 613
      if (divide)
        for (size_t i=0; i<nx_dirty; ++i)
          for (size_t j=0; j<ny_dirty; ++j)
Martin Reinecke's avatar
Martin Reinecke committed
614
            img2(i,j) = img(i,j)/(cfu[i]*cfv[j]);
Martin Reinecke's avatar
Martin Reinecke committed
615 616 617
      else
        for (size_t i=0; i<nx_dirty; ++i)
          for (size_t j=0; j<ny_dirty; ++j)
Martin Reinecke's avatar
Martin Reinecke committed
618
            img2(i,j) = img(i,j)*cfu[i]*cfv[j];
Martin Reinecke's avatar
Martin Reinecke committed
619 620
      }

621
    template<typename T> void grid2dirty_post(const mav<T,2> &tmav, const mav<T,2> &dirty) const
622
      {
Martin Reinecke's avatar
Martin Reinecke committed
623
      checkShape(dirty.shape(), {nx_dirty,ny_dirty});
624 625 626 627 628 629 630
      for (size_t i=0; i<nx_dirty; ++i)
        for (size_t j=0; j<ny_dirty; ++j)
          {
          size_t i2 = nu-nx_dirty/2+i;
          if (i2>=nu) i2-=nu;
          size_t j2 = nv-ny_dirty/2+j;
          if (j2>=nv) j2-=nv;
631 632
          // FIXME: for some reason g++ warns about double-to-float conversion
          // here, even though there is an explicit cast...
Martin Reinecke's avatar
Martin Reinecke committed
633
          dirty(i,j) = tmav(i2,j2)*T(cfu[i]*cfv[j]);
634 635
          }
      }
Martin Reinecke's avatar
Martin Reinecke committed
636

637 638 639 640 641 642 643 644
    template<typename T> void grid2dirty(const const_mav<T,2> &grid, const mav<T,2> &dirty) const
      {
      checkShape(grid.shape(), {nu,nv});
      tmpStorage<T,2> tmpdat({nu,nv});
      auto tmav = tmpdat.getMav();
      hartley2_2D<T>(grid, tmav, nthreads);
      grid2dirty_post(tmav, dirty);
      }
645

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
646
    template<typename T> void grid2dirty_c(const mav<const complex<T>,2> &grid, mav<complex<T>,2> &dirty) const
Martin Reinecke's avatar
Martin Reinecke committed
647
      {
Martin Reinecke's avatar
Martin Reinecke committed
648
      checkShape(grid.shape(), {nu,nv});
649 650
      tmpStorage<complex<T>,2> tmpdat({nu,nv});
      auto tmp = tmpdat.getMav();
Martin Reinecke's avatar
cleanup  
Martin Reinecke committed
651
      constexpr auto sc = ptrdiff_t(sizeof(complex<T>));
Martin Reinecke's avatar
Martin Reinecke committed
652 653 654
      pocketfft::c2c({nu,nv},{grid.stride(0)*sc,grid.stride(1)*sc},
        {tmp.stride(0)*sc, tmp.stride(1)*sc}, {0,1}, pocketfft::BACKWARD,
        grid.data(), tmp.data(), T(1), nthreads);
655
      grid2dirty_post(tmp, dirty);
Martin Reinecke's avatar
Martin Reinecke committed
656
      }
Martin Reinecke's avatar
updates  
Martin Reinecke committed
657

658
    template<typename T> void dirty2grid_pre(const const_mav<T,2> &dirty, mav<T,2> &grid) const
659 660 661 662 663 664 665 666 667 668 669
      {
      checkShape(dirty.shape(), {nx_dirty, ny_dirty});
      checkShape(grid.shape(), {nu, nv});
      grid.fill(0);
      for (size_t i=0; i<nx_dirty; ++i)
        for (size_t j=0; j<ny_dirty; ++j)
          {
          size_t i2 = nu-nx_dirty/2+i;
          if (i2>=nu) i2-=nu;
          size_t j2 = nv-ny_dirty/2+j;
          if (j2>=nv) j2-=nv;
670 671
          // FIXME: for some reason g++ warns about double-to-float conversion
          // here, even though there is an explicit cast...
Martin Reinecke's avatar
Martin Reinecke committed
672
          grid(i2,j2) = dirty(i,j)*T(cfu[i]*cfv[j]);
673
          }
674
      }
Martin Reinecke's avatar
Martin Reinecke committed
675

676 677 678
    template<typename T> void dirty2grid(const const_mav<T,2> &dirty, mav<T,2> &grid) const
      {
      dirty2grid_pre(dirty, grid);
Martin Reinecke's avatar
Martin Reinecke committed
679
      hartley2_2D<T>(cmav(grid), grid, nthreads);
680 681
      }

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
682
    template<typename T> void dirty2grid_c(const const_mav<complex<T>,2> &dirty,
Martin Reinecke's avatar
updates  
Martin Reinecke committed
683
      mav<complex<T>,2> &grid) const
Martin Reinecke's avatar
Martin Reinecke committed
684
      {
685
      dirty2grid_pre(dirty, grid);
Martin Reinecke's avatar
cleanup  
Martin Reinecke committed
686
      constexpr auto sc = ptrdiff_t(sizeof(complex<T>));
Martin Reinecke's avatar
updates  
Martin Reinecke committed
687
      pocketfft::stride_t strides{grid.stride(0)*sc,grid.stride(1)*sc};
Martin Reinecke's avatar
Martin Reinecke committed
688
      pocketfft::c2c({nu,nv}, strides, strides, {0,1}, pocketfft::FORWARD,
Martin Reinecke's avatar
updates  
Martin Reinecke committed
689
        grid.data(), grid.data(), T(1), nthreads);
Martin Reinecke's avatar
Martin Reinecke committed
690
      }
Martin Reinecke's avatar
updates  
Martin Reinecke committed
691

Martin Reinecke's avatar
Martin Reinecke committed
692
    void getpix(double u_in, double v_in, double &u, double &v, int &iu0, int &iv0) const
Martin Reinecke's avatar
Martin Reinecke committed
693
      {
Martin Reinecke's avatar
Martin Reinecke committed
694 695
      u=fmod1(u_in*psx)*nu;
      iu0 = min(int(u+ushift)-int(nu), maxiu0);
Martin Reinecke's avatar
Martin Reinecke committed
696
      v=fmod1(v_in*psy)*nv;
Martin Reinecke's avatar
Martin Reinecke committed
697
      iv0 = min(int(v+vshift)-int(nv), maxiv0);
Martin Reinecke's avatar
Martin Reinecke committed
698
      }
Martin Reinecke's avatar
updates  
Martin Reinecke committed
699

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
700
    template<typename T> void apply_wscreen(const const_mav<complex<T>,2> &dirty,
Martin Reinecke's avatar
updates  
Martin Reinecke committed
701
      mav<complex<T>,2> &dirty2, double w, bool adjoint) const
Martin Reinecke's avatar
Martin Reinecke committed
702
      {
Martin Reinecke's avatar
updates  
Martin Reinecke committed
703 704
      checkShape(dirty.shape(), {nx_dirty, ny_dirty});
      checkShape(dirty2.shape(), {nx_dirty, ny_dirty});
Martin Reinecke's avatar
Martin Reinecke committed
705 706
      double x0 = -0.5*nx_dirty*psx,
             y0 = -0.5*ny_dirty*psy;
Martin Reinecke's avatar
updates  
Martin Reinecke committed
707
#pragma omp parallel for num_threads(nthreads) schedule(static)
Martin Reinecke's avatar
Martin Reinecke committed
708 709 710 711 712 713 714
      for (size_t i=0; i<=nx_dirty/2; ++i)
        {
        double fx = x0+i*psx;
        fx *= fx;
        for (size_t j=0; j<=ny_dirty/2; ++j)
          {
          double fy = y0+j*psy;
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
715
          auto ws = complex<T>(wscreen(fx, fy*fy, w, adjoint));
Martin Reinecke's avatar
updates  
Martin Reinecke committed
716
          dirty2(i,j) = dirty(i,j)*ws; // lower left
Martin Reinecke's avatar
Martin Reinecke committed
717 718 719
          size_t i2 = nx_dirty-i, j2 = ny_dirty-j;
          if ((i>0)&&(i<i2))
            {
Martin Reinecke's avatar
updates  
Martin Reinecke committed
720
            dirty2(i2,j) = dirty(i2,j)*ws; // lower right
Martin Reinecke's avatar
Martin Reinecke committed
721
            if ((j>0)&&(j<j2))
Martin Reinecke's avatar
updates  
Martin Reinecke committed
722
              dirty2(i2,j2) = dirty(i2,j2)*ws; // upper right
Martin Reinecke's avatar
Martin Reinecke committed
723 724
            }
          if ((j>0)&&(j<j2))
Martin Reinecke's avatar
updates  
Martin Reinecke committed
725
            dirty2(i,j2) = dirty(i,j2)*ws; // upper left
Martin Reinecke's avatar
Martin Reinecke committed
726 727 728 729 730 731 732
          }
        }
      }
  };

constexpr int logsquare=4;

Martin Reinecke's avatar
Martin Reinecke committed
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747
#ifdef _OPENMP
class Lock
  {
  private:
    omp_lock_t lck;

    Lock(const Lock &) = delete;
    Lock& operator=(const Lock &) = delete;

  public:
    Lock() { omp_init_lock(&lck); }
    ~Lock() { omp_destroy_lock(&lck); }
    void lock() { omp_set_lock(&lck); }
    void unlock() { omp_unset_lock(&lck); }
  };
Martin Reinecke's avatar
Martin Reinecke committed
748 749 750
int my_max_threads() { return omp_get_max_threads(); }
int my_num_threads() { return omp_get_num_threads(); }
int my_thread_num() { return omp_get_thread_num(); }
Martin Reinecke's avatar
Martin Reinecke committed
751 752 753 754 755 756 757
#else
class Lock
  {
  public:
    Lock() {}
    ~Lock() {}
    void lock() {}
Martin Reinecke's avatar
Martin Reinecke committed
758
    void unlock() {}
Martin Reinecke's avatar
Martin Reinecke committed
759
  };
Martin Reinecke's avatar
Martin Reinecke committed
760 761 762
int my_max_threads() { return 1; }
int my_num_threads() { return 1; }
int my_thread_num() { return 0; }
Martin Reinecke's avatar
Martin Reinecke committed
763 764
#endif

Martin Reinecke's avatar
Martin Reinecke committed
765
template<typename T, typename T2=complex<T>> class Helper
Martin Reinecke's avatar
Martin Reinecke committed
766 767
  {
  private:
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
768
    const GridderConfig &gconf;
Martin Reinecke's avatar
Martin Reinecke committed
769 770 771 772 773 774 775 776
    int nu, nv, nsafe, supp;
    T beta;
    const T2 *grid_r;
    T2 *grid_w;
    int su, sv;
    int iu0, iv0; // start index of the current visibility
    int bu0, bv0; // start index of the current buffer

Martin Reinecke's avatar
Martin Reinecke committed
777
    vector<T2> rbuf, wbuf;
Martin Reinecke's avatar
Martin Reinecke committed
778
    bool do_w_gridding;
Martin Reinecke's avatar
Martin Reinecke committed
779
    double w0, xdw;
Martin Reinecke's avatar
Martin Reinecke committed
780
    size_t nexp;
781
    size_t nvecs;
Martin Reinecke's avatar
Martin Reinecke committed
782
    vector<Lock> &locks;
Martin Reinecke's avatar
Martin Reinecke committed
783 784 785 786 787 788 789 790 791 792 793 794

    void dump() const
      {
      if (bu0<-nsafe) return; // nothing written into buffer yet

#pragma omp critical (gridder_writing_to_grid)
{
      int idxu = (bu0+nu)%nu;
      int idxv0 = (bv0+nv)%nv;
      for (int iu=0; iu<su; ++iu)
        {
        int idxv = idxv0;
Martin Reinecke's avatar
Martin Reinecke committed
795
        locks[idxu].lock();
Martin Reinecke's avatar
Martin Reinecke committed
796 797 798 799 800
        for (int iv=0; iv<sv; ++iv)
          {
          grid_w[idxu*nv + idxv] += wbuf[iu*sv + iv];
          if (++idxv>=nv) idxv=0;
          }
Martin Reinecke's avatar
Martin Reinecke committed
801
        locks[idxu].unlock();
Martin Reinecke's avatar
Martin Reinecke committed
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825
        if (++idxu>=nu) idxu=0;
        }
}
      }

    void load()
      {
      int idxu = (bu0+nu)%nu;
      int idxv0 = (bv0+nv)%nv;
      for (int iu=0; iu<su; ++iu)
        {
        int idxv = idxv0;
        for (int iv=0; iv<sv; ++iv)
          {
          rbuf[iu*sv + iv] = grid_r[idxu*nv + idxv];
          if (++idxv>=nv) idxv=0;
          }
        if (++idxu>=nu) idxu=0;
        }
      }

  public:
    const T2 *p0r;
    T2 *p0w;
Martin Reinecke's avatar
Martin Reinecke committed
826
    T kernel[64] ALIGNED(64);
Martin Reinecke's avatar
Martin Reinecke committed
827

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
828
    Helper(const GridderConfig &gconf_, const T2 *grid_r_, T2 *grid_w_,
Martin Reinecke's avatar
merge  
Martin Reinecke committed
829
      vector<Lock> &locks_, double w0_=-1, double dw_=-1)
Martin Reinecke's avatar
Martin Reinecke committed
830
      : gconf(gconf_), nu(gconf.Nu()), nv(gconf.Nv()), nsafe(gconf.Nsafe()),
Martin Reinecke's avatar
Martin Reinecke committed
831
        supp(gconf.Supp()), beta(T(gconf.Beta())), grid_r(grid_r_),
Martin Reinecke's avatar
Martin Reinecke committed
832 833 834 835
        grid_w(grid_w_), su(2*nsafe+(1<<logsquare)), sv(2*nsafe+(1<<logsquare)),
        bu0(-1000000), bv0(-1000000),
        rbuf(su*sv*(grid_r!=nullptr),T(0)),
        wbuf(su*sv*(grid_w!=nullptr),T(0)),
Martin Reinecke's avatar
Martin Reinecke committed
836 837 838 839
        do_w_gridding(dw_>0),
        w0(w0_),
        xdw(T(1)/dw_),
        nexp(2*supp + do_w_gridding),
Martin Reinecke's avatar
Martin Reinecke committed
840 841
        nvecs(VLEN<T>::val*((nexp+VLEN<T>::val-1)/VLEN<T>::val)),
        locks(locks_)
Martin Reinecke's avatar
Martin Reinecke committed
842 843 844 845
      {}
    ~Helper() { if (grid_w) dump(); }

    int lineJump() const { return sv; }
Martin Reinecke's avatar
Martin Reinecke committed
846
    T Wfac() const { return kernel[2*supp]; }
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
847
    void prep(const UVW &in)
Martin Reinecke's avatar
Martin Reinecke committed
848
      {
Martin Reinecke's avatar
Martin Reinecke committed
849 850 851 852 853
      double u, v;
      gconf.getpix(in.u, in.v, u, v, iu0, iv0);
      double xsupp=2./supp;
      double x0 = xsupp*(iu0-u);
      double y0 = xsupp*(iv0-v);
Martin Reinecke's avatar
Martin Reinecke committed
854 855
      for (int i=0; i<supp; ++i)
        {
Martin Reinecke's avatar
Martin Reinecke committed
856 857
        kernel[i  ] = T(x0+i*xsupp);
        kernel[i+supp] = T(y0+i*xsupp);
Martin Reinecke's avatar
Martin Reinecke committed
858
        }
Martin Reinecke's avatar
Martin Reinecke committed
859
      if (do_w_gridding)
Martin Reinecke's avatar
Martin Reinecke committed
860
        kernel[2*supp] = min(T(1), T(xdw*xsupp*abs(w0-in.w)));
Martin Reinecke's avatar
Martin Reinecke committed
861
      for (size_t i=nexp; i<nvecs; ++i)
862 863
        kernel[i]=0;
      for (size_t i=0; i<nvecs; ++i)
Martin Reinecke's avatar
Martin Reinecke committed
864
        kernel[i] = exp(beta*(sqrt(T(1)-kernel[i]*kernel[i])-T(1)));
Martin Reinecke's avatar
Martin Reinecke committed
865 866 867 868 869 870 871 872 873 874 875 876
      if ((iu0<bu0) || (iv0<bv0) || (iu0+supp>bu0+su) || (iv0+supp>bv0+sv))
        {
        if (grid_w) { dump(); fill(wbuf.begin(), wbuf.end(), T(0)); }
        bu0=((((iu0+nsafe)>>logsquare)<<logsquare))-nsafe;
        bv0=((((iv0+nsafe)>>logsquare)<<logsquare))-nsafe;
        if (grid_r) load();
        }
      p0r = grid_r ? rbuf.data() + sv*(iu0-bu0) + iv0-bv0 : nullptr;
      p0w = grid_w ? wbuf.data() + sv*(iu0-bu0) + iv0-bv0 : nullptr;
      }
  };

Martin Reinecke's avatar
Martin Reinecke committed
877 878 879 880
template<class T, class Serv> class SubServ
  {
  private:
    const Serv &srv;
881
    const_mav<idx_t,1> subidx;
Martin Reinecke's avatar
Martin Reinecke committed
882 883

  public:
884
    SubServ(const Serv &orig, const const_mav<idx_t,1> &subidx_)
Martin Reinecke's avatar
Martin Reinecke committed
885 886 887 888 889 890 891
      : srv(orig), subidx(subidx_){}
    size_t Nvis() const { return subidx.size(); }
    const Baselines &getBaselines() const { return srv.getBaselines(); }
    UVW getCoord(size_t i) const
      { return srv.getCoord(subidx[i]); }
    complex<T> getVis(size_t i) const
      { return srv.getVis(subidx[i]); }
892
    idx_t getIdx(size_t i) const { return srv.getIdx(subidx[i]); }
Martin Reinecke's avatar
Martin Reinecke committed
893 894 895 896 897 898
    void setVis (size_t i, const complex<T> &v) const
      { srv.setVis(subidx[i], v); }
    void addVis (size_t i, const complex<T> &v) const
      { srv.addVis(subidx[i], v); }
  };

Martin Reinecke's avatar
step 1  
Martin Reinecke committed
899
template<class T, class T2> class VisServ
Martin Reinecke's avatar
updates  
Martin Reinecke committed
900
  {
901
  private:
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
902
    const Baselines &baselines;
903
    const_mav<idx_t,1> idx;
904
    T2 vis;
905
    const_mav<T,1> wgt;
906 907
    size_t nvis;
    bool have_wgt;
Martin Reinecke's avatar
updates  
Martin Reinecke committed
908

909
  public:
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
910
    VisServ(const Baselines &baselines_,
911
      const const_mav<idx_t,1> &idx_, T2 vis_, const const_mav<T,1> &wgt_)
Martin Reinecke's avatar
Martin Reinecke committed
912 913
      : baselines(baselines_), idx(idx_), vis(vis_), wgt(wgt_),
        nvis(vis.shape(0)), have_wgt(wgt.size()!=0)
914 915 916 917
      {
      checkShape(idx.shape(), {nvis});
      if (have_wgt) checkShape(wgt.shape(), {nvis});
      }
918
    SubServ<T, VisServ> getSubserv(const const_mav<idx_t,1> &subidx) const
Martin Reinecke's avatar
Martin Reinecke committed
919
      { return SubServ<T, VisServ>(*this, subidx); }
920
    size_t Nvis() const { return nvis; }
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
921 922
    const Baselines &getBaselines() const { return baselines; }
    UVW getCoord(size_t i) const
923 924 925
      { return baselines.effectiveCoord(idx[i]); }
    complex<T> getVis(size_t i) const
      { return have_wgt ? vis(i)*wgt(i) : vis(i); }
926
    idx_t getIdx(size_t i) const { return idx[i]; }
927 928 929 930 931
    void setVis (size_t i, const complex<T> &v) const
      { vis(i) = have_wgt ? v*wgt(i) : v; }
    void addVis (size_t i, const complex<T> &v) const
      { vis(i) += have_wgt ? v*wgt(i) : v; }
  };
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
932 933
template<class T, class T2> VisServ<T, T2> makeVisServ
  (const Baselines &baselines,
934
   const const_mav<idx_t,1> &idx, const T2 &vis, const const_mav<T,1> &wgt)
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
935 936 937
  { return VisServ<T, T2>(baselines, idx, vis, wgt); }

template<class T, class T2> class MsServ
938 939
  {
  private:
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
940
    const Baselines &baselines;
941
    const_mav<idx_t,1> idx;
942
    T2 ms;
943
    const_mav<T,2> wgt;
944 945
    size_t nvis;
    bool have_wgt;
Martin Reinecke's avatar
updates  
Martin Reinecke committed
946

947
  public:
Martin Reinecke's avatar
step 1  
Martin Reinecke committed
948
    MsServ(const Baselines &baselines_,
949
    const const_mav<idx_t,1> &idx_, T2 ms_, const const_mav<T,2> &wgt_)
Martin Reinecke's avatar
Martin Reinecke committed
950 951
      : baselines(baselines_), idx(idx_), ms(ms_), wgt(wgt_),
        nvis(idx.shape(0)), have_wgt(wgt.size()!=0)
Martin Reinecke's avatar
updates  
Martin Reinecke committed
952
      {