src/test/adaptbug.c

    Check that user flags are properly reset when adapting

    #include "fractions.h"
#include "utils.h"

#define LEVEL 12

static bool check_flags()
{
  foreach_cell()
    foreach_neighbor()
      if (allocated(0))
	for (int i = user; i <= user + 7; i++)
	  assert (!(cell.flags & (1 << i)));
  return true;
}

int  main(int argc, char const *argv[])
{
  size (10);
  origin (-L0/2., 0.);
  init_grid (256);

    Initial refinement.

      scalar f[];
  int iteration = 0;
  do {
    fraction (f, sq(x) + sq(y) - sq(1.));
  }
  while (check_flags() &&
	 adapt_wavelet ({f}, (double[]){1e-3}, LEVEL).nf != 0 &&
	 iteration++ <= 10);

  for (int i = 0; i <= 5; i++) {
    scalar s[];
    foreach()
      s[] = noise();

    We adapt noise with zero tolerance i.e. the mesh should be refined everywhere down to LEVEl. The bug was triggered when minlevel is set.

        check_flags();
    adapt_wavelet ({s}, (double []){0}, maxlevel = LEVEL, minlevel = 5);

    This should eventually give a uniform refinement.

    Refinement levels 
        scalar l[];
    foreach()
      l[] = level;
    output_ppm (l, min = 5, max = LEVEL, file = "grid.gif");
  }
}