bmo_unsubdivide.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "BLI_utildefines.h"
 
#include "bmesh.hh"
#include "bmesh_tools.hh"
 
#include "intern/bmesh_operators_private.hh" /* own include */
 
void bmo_unsubdivide_exec(BMesh *bm, BMOperator *op)
{
  /* - `BMVert.flag & BM_ELEM_TAG`: Shows we touched this vert.
   * - `BMVert.index == -1`:        Shows we will remove this vert. */
  BMVert *v;
  BMIter iter;
 
  const int iterations = max_ii(1, BMO_slot_int_get(op->slots_in, "iterations"));
 
  BMOpSlot *vinput = BMO_slot_get(op->slots_in, "verts");
  BMVert **vinput_arr = (BMVert **)vinput->data.buf;
  int v_index;
 
  /* tag verts */
  BM_ITER_MESH (v, &iter, bm, BM_VERTS_OF_MESH) {
    BM_elem_flag_disable(v, BM_ELEM_TAG);
  }
  for (v_index = 0; v_index < vinput->len; v_index++) {
    v = vinput_arr[v_index];
    BM_elem_flag_enable(v, BM_ELEM_TAG);
  }
 
  /* do all the real work here */
  BM_mesh_decimate_unsubdivide_ex(bm, iterations, true);
}