tiling.c

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// mightymandel -- GPU-based Mandelbrot Set explorer
// Copyright (C) 2012,2013,2014,2015 Claude Heiland-Allen
// License GPL3+ http://www.gnu.org/licenses/gpl.html

#include "tiling.h"
#include "utility.h"

void tiling_begin(struct tiling *tiling, int cols, int rows, int width, int height, const mpfr_t centerx, const mpfr_t centery, const mpfr_t radius) {
  mpfr_inits2(53, tiling->centerx, tiling->centery, tiling->radius, tiling->tiled_centerx, tiling->tiled_centery, tiling->tiled_radius, (mpfr_ptr) 0);
  tiling->width = width;
  tiling->height = height;
  tiling->col = -1;
  tiling->row = 0;
  tiling->tiled_cols = cols;
  tiling->tiled_rows = rows;
  mpfr_set_prec(tiling->tiled_centerx, mpfr_get_prec(centerx));
  mpfr_set_prec(tiling->tiled_centery, mpfr_get_prec(centery));
  mpfr_set_prec(tiling->tiled_radius, mpfr_get_prec(radius));
  mpfr_set(tiling->tiled_centerx, centerx, MPFR_RNDN);
  mpfr_set(tiling->tiled_centery, centery, MPFR_RNDN);
  mpfr_set(tiling->tiled_radius, radius, MPFR_RNDN);
}

void tiling_end(struct tiling *tiling) {
  mpfr_clears(tiling->centerx, tiling->centery, tiling->radius, tiling->tiled_centerx, tiling->tiled_centery, tiling->tiled_radius, (mpfr_ptr) 0);
}

bool tiling_next(struct tiling *tiling) {
  tiling->col++;
  if (tiling->col >= tiling->tiled_cols) {
    tiling->col = 0;
    tiling->row++;
    if (tiling->row >= tiling->tiled_rows) {
      return false;
    }
  }
  mpfr_prec_t p = 16 + mpfr_get_prec(tiling->tiled_centerx);
  mpfr_set_prec(tiling->centerx, p);
  mpfr_set_prec(tiling->centery, p);
  double i = (tiling->col + 0.5) * tiling->width;
  double j = (tiling->row + 0.5) * tiling->height;
  int width = tiling->width * tiling->tiled_cols;
  int height = tiling->height * tiling->tiled_rows;
  pixel_coordinate(tiling->centerx, tiling->centery, width, height, tiling->tiled_centerx, tiling->tiled_centery, tiling->tiled_radius, i, j);
  mpfr_div_si(tiling->radius, tiling->tiled_radius, tiling->tiled_rows, MPFR_RNDN);
  return true;
}