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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup bmesh
*
* Duplicate geometry from one mesh from another.
*/
#include "DNA_object_types.h"
#include "MEM_guardedalloc.h"
#include "BLI_alloca.h"
#include "BLI_math_vector.h"
#include "bmesh.h"
#include "intern/bmesh_private.h" /* for element checking */
static BMVert *bm_vert_copy(BMesh *bm_src, BMesh *bm_dst, BMVert *v_src)
{
BMVert *v_dst = BM_vert_create(bm_dst, v_src->co, NULL, BM_CREATE_SKIP_CD);
BM_elem_attrs_copy(bm_src, bm_dst, v_src, v_dst);
return v_dst;
}
static BMEdge *bm_edge_copy_with_arrays(BMesh *bm_src,
BMesh *bm_dst,
BMEdge *e_src,
BMVert **verts_dst)
{
BMVert *e_dst_v1 = verts_dst[BM_elem_index_get(e_src->v1)];
BMVert *e_dst_v2 = verts_dst[BM_elem_index_get(e_src->v2)];
BMEdge *e_dst = BM_edge_create(bm_dst, e_dst_v1, e_dst_v2, NULL, BM_CREATE_SKIP_CD);
BM_elem_attrs_copy(bm_src, bm_dst, e_src, e_dst);
return e_dst;
}
static BMFace *bm_face_copy_with_arrays(
BMesh *bm_src, BMesh *bm_dst, BMFace *f_src, BMVert **verts_dst, BMEdge **edges_dst)
{
BMFace *f_dst;
BMVert **vtar = BLI_array_alloca(vtar, f_src->len);
BMEdge **edar = BLI_array_alloca(edar, f_src->len);
BMLoop *l_iter_src, *l_iter_dst, *l_first_src;
int i;
l_first_src = BM_FACE_FIRST_LOOP(f_src);
/* Lookup verts & edges. */
l_iter_src = l_first_src;
i = 0;
do {
vtar[i] = verts_dst[BM_elem_index_get(l_iter_src->v)];
edar[i] = edges_dst[BM_elem_index_get(l_iter_src->e)];
i++;
} while ((l_iter_src = l_iter_src->next) != l_first_src);
/* Create new face. */
f_dst = BM_face_create(bm_dst, vtar, edar, f_src->len, NULL, BM_CREATE_SKIP_CD);
/* Copy attributes. */
BM_elem_attrs_copy(bm_src, bm_dst, f_src, f_dst);
/* Copy per-loop custom data. */
l_iter_src = l_first_src;
l_iter_dst = BM_FACE_FIRST_LOOP(f_dst);
do {
BM_elem_attrs_copy(bm_src, bm_dst, l_iter_src, l_iter_dst);
} while ((void)(l_iter_dst = l_iter_dst->next), (l_iter_src = l_iter_src->next) != l_first_src);
return f_dst;
}
void BM_mesh_copy_arrays(BMesh *bm_src,
BMesh *bm_dst,
BMVert **verts_src,
uint verts_src_len,
BMEdge **edges_src,
uint edges_src_len,
BMFace **faces_src,
uint faces_src_len)
{
/* Vertices. */
BMVert **verts_dst = MEM_mallocN(sizeof(*verts_dst) * verts_src_len, __func__);
for (uint i = 0; i < verts_src_len; i++) {
BMVert *v_src = verts_src[i];
BM_elem_index_set(v_src, i); /* set_dirty! */
BMVert *v_dst = bm_vert_copy(bm_src, bm_dst, v_src);
BM_elem_index_set(v_dst, i); /* set_ok */
verts_dst[i] = v_dst;
}
bm_src->elem_index_dirty |= BM_VERT;
bm_dst->elem_index_dirty &= ~BM_VERT;
/* Edges. */
BMEdge **edges_dst = MEM_mallocN(sizeof(*edges_dst) * edges_src_len, __func__);
for (uint i = 0; i < edges_src_len; i++) {
BMEdge *e_src = edges_src[i];
BM_elem_index_set(e_src, i); /* set_dirty! */
BMEdge *e_dst = bm_edge_copy_with_arrays(bm_src, bm_dst, e_src, verts_dst);
BM_elem_index_set(e_dst, i);
edges_dst[i] = e_dst;
}
bm_src->elem_index_dirty |= BM_EDGE;
bm_dst->elem_index_dirty &= ~BM_EDGE;
/* Faces. */
for (uint i = 0; i < faces_src_len; i++) {
BMFace *f_src = faces_src[i];
BMFace *f_dst = bm_face_copy_with_arrays(bm_src, bm_dst, f_src, verts_dst, edges_dst);
BM_elem_index_set(f_dst, i);
}
bm_dst->elem_index_dirty &= ~BM_FACE;
/* Cleanup. */
MEM_freeN(verts_dst);
MEM_freeN(edges_dst);
}
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