diff options
author | Campbell Barton <campbell@blender.org> | 2022-05-05 13:40:56 +0300 |
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committer | Campbell Barton <campbell@blender.org> | 2022-05-05 13:40:56 +0300 |
commit | 756710800c0fd8cc2919ed338a2a897aace535d5 (patch) | |
tree | 328f9672a0d94c8785c857c285ff71c3cc59bcb0 /source/blender/blenkernel/intern/mesh_merge_customdata.cc | |
parent | 78fc5ea1c398f70d22cda72be33c105146c0d542 (diff) |
File missing from 78fc5ea1c398f70d22cda72be33c105146c0d542
Diffstat (limited to 'source/blender/blenkernel/intern/mesh_merge_customdata.cc')
-rw-r--r-- | source/blender/blenkernel/intern/mesh_merge_customdata.cc | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/source/blender/blenkernel/intern/mesh_merge_customdata.cc b/source/blender/blenkernel/intern/mesh_merge_customdata.cc new file mode 100644 index 00000000000..adaf378ed27 --- /dev/null +++ b/source/blender/blenkernel/intern/mesh_merge_customdata.cc @@ -0,0 +1,137 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +/** \file + * \ingroup bke + */ + +#include "MEM_guardedalloc.h" + +#include "DNA_mesh_types.h" +#include "DNA_meshdata_types.h" + +#include "BLI_math.h" +#include "BLI_task.hh" +#include "BLI_utildefines.h" + +#include "BKE_customdata.h" +#include "BKE_mesh.h" +#include "BKE_mesh_mapping.h" +#include "BLI_memarena.h" + +#include "BLI_strict_flags.h" + +using namespace blender; + +enum { + CMP_CLOSE = 0, + CMP_EQUAL = 1, + CMP_APART = 2, +}; + +static int compare_v2_classify(const float uv_a[2], const float uv_b[2]) +{ + if (uv_a[0] == uv_b[0] && uv_a[1] == uv_b[1]) { + return CMP_EQUAL; + } + /* Note that the ULP value is the primary value used to compare relative values + * as the absolute value doesn't account for float precision at difference scales. + * - For subdivision-surface ULP of 3 is sufficient, + * although this value is extremely small. + * - For bevel the URL of 12 is sufficient to merge UV's that appear to be connected + * with bevel on Suzanne beveled 15% with 6 segments. + * + * These values could be tweaked but should be kept on the small side to prevent + * unintentional joining of intentionally dis-connected UV's. + * + * Before v2.91 the threshold was either (`1e-4` or `0.05 / image_size` for selection picking). + * So picking used a threshold of `1e-4` for a 500x500 image and `1e-5` for a 5000x5000 image. + * Given this value worked reasonably well for a long time, the absolute difference should + * never exceed `1e-4` (#STD_UV_CONNECT_LIMIT which is still used in a few areas). */ + const float diff_abs = 1e-12f; + const int diff_ulp = 12; + + if (compare_ff_relative(uv_a[0], uv_b[0], diff_abs, diff_ulp) && + compare_ff_relative(uv_a[1], uv_b[1], diff_abs, diff_ulp)) { + return CMP_CLOSE; + } + return CMP_APART; +} + +static void merge_uvs_for_vertex(const Span<int> loops_for_vert, Span<MLoopUV *> mloopuv_layers) +{ + if (loops_for_vert.size() <= 1) { + return; + } + /* Manipulate a copy of the loop indices, de-duplicating UV's per layer. */ + Vector<int, 32> loops_merge; + loops_merge.reserve(loops_for_vert.size()); + for (MLoopUV *mloopuv : mloopuv_layers) { + BLI_assert(loops_merge.is_empty()); + loops_merge.extend_unchecked(loops_for_vert); + while (loops_merge.size() > 1) { + uint i_last = (uint)loops_merge.size() - 1; + const float *uv_src = mloopuv[loops_merge[0]].uv; + for (uint i = 1; i <= i_last;) { + float *uv_dst = mloopuv[loops_merge[i]].uv; + switch (compare_v2_classify(uv_src, uv_dst)) { + case CMP_CLOSE: { + uv_dst[0] = uv_src[0]; + uv_dst[1] = uv_src[1]; + ATTR_FALLTHROUGH; + } + case CMP_EQUAL: { + loops_merge[i] = loops_merge[i_last--]; + break; + } + case CMP_APART: { + /* Doesn't match, check the next UV. */ + i++; + break; + } + default: { + BLI_assert_unreachable(); + } + } + } + /* Finished de-duplicating with the first index, throw it away. */ + loops_merge[0] = loops_merge[i_last]; + loops_merge.resize(i_last); + } + loops_merge.clear(); + } +} + +void BKE_mesh_merge_customdata_for_apply_modifier(Mesh *me) +{ + if (me->totloop == 0) { + return; + } + const int mloopuv_layers_num = CustomData_number_of_layers(&me->ldata, CD_MLOOPUV); + if (mloopuv_layers_num == 0) { + return; + } + + int *vert_map_mem; + struct MeshElemMap *vert_to_loop; + BKE_mesh_vert_loop_map_create( + &vert_to_loop, &vert_map_mem, me->mpoly, me->mloop, me->totvert, me->totpoly, me->totloop); + + Vector<MLoopUV *> mloopuv_layers; + mloopuv_layers.reserve(mloopuv_layers_num); + for (int a = 0; a < mloopuv_layers_num; a++) { + MLoopUV *mloopuv = static_cast<MLoopUV *>(CustomData_get_layer_n(&me->ldata, CD_MLOOPUV, a)); + mloopuv_layers.append_unchecked(mloopuv); + } + + Span<MLoopUV *> mloopuv_layers_as_span = mloopuv_layers.as_span(); + threading::parallel_for(IndexRange(me->totvert), 1024, [&](IndexRange range) { + for (const int64_t v_index : range) { + MeshElemMap &loops_for_vert = vert_to_loop[v_index]; + Span<int> loops_for_vert_span(loops_for_vert.indices, loops_for_vert.count); + merge_uvs_for_vertex(loops_for_vert_span, mloopuv_layers_as_span); + } + }); + + MEM_freeN(vert_to_loop); + MEM_freeN(vert_map_mem); +} |