diff options
author | Hans Goudey <h.goudey@me.com> | 2022-08-31 17:09:01 +0300 |
---|---|---|
committer | Hans Goudey <h.goudey@me.com> | 2022-08-31 17:09:01 +0300 |
commit | f1c0249f34c4171ec311b5b9882e36fed5889259 (patch) | |
tree | 7dd630c9301b8dd468c8279e8c446c62824fb6d6 /source/blender/blenkernel/intern/pbvh.c | |
parent | 3e73afb5360592fe2bf43419e216035ea3c281f9 (diff) |
Mesh: Move material indices to a generic attribute
This patch moves material indices from the mesh `MPoly` struct to a
generic integer attribute. The builtin material index was already
exposed in geometry nodes, but this makes it a "proper" attribute
accessible with Python and visible in the "Attributes" panel.
The goals of the refactor are code simplification and memory and
performance improvements, mainly because the attribute doesn't have
to be stored and processed if there are no materials. However, until
4.0, material indices will still be read and written in the old
format, meaning there may be a temporary increase in memory usage.
Further notes:
* Completely removing the `MPoly.mat_nr` after 4.0 may require
changes to DNA or introducing a new `MPoly` type.
* Geometry nodes regression tests didn't look at material indices,
so the change reveals a bug in the realize instances node that I fixed.
* Access to material indices from the RNA `MeshPolygon` type is slower
with this patch. The `material_index` attribute can be used instead.
* Cycles is changed to read from the attribute instead.
* BMesh isn't changed in this patch. Theoretically it could be though,
to save 2 bytes per face when less than two materials are used.
* Eventually we could use a 16 bit integer attribute type instead.
Ref T95967
Differential Revision: https://developer.blender.org/D15675
Diffstat (limited to 'source/blender/blenkernel/intern/pbvh.c')
-rw-r--r-- | source/blender/blenkernel/intern/pbvh.c | 31 |
1 files changed, 14 insertions, 17 deletions
diff --git a/source/blender/blenkernel/intern/pbvh.c b/source/blender/blenkernel/intern/pbvh.c index 24f3097f9e3..1c6274ef35e 100644 --- a/source/blender/blenkernel/intern/pbvh.c +++ b/source/blender/blenkernel/intern/pbvh.c @@ -145,9 +145,14 @@ static void update_node_vb(PBVH *pbvh, PBVHNode *node) // BB_expand(&node->vb, co); //} -static bool face_materials_match(const MPoly *f1, const MPoly *f2) +static bool face_materials_match(const PBVH *pbvh, const int a, const int b) { - return ((f1->flag & ME_SMOOTH) == (f2->flag & ME_SMOOTH) && (f1->mat_nr == f2->mat_nr)); + if (pbvh->material_indices) { + if (pbvh->material_indices[a] != pbvh->material_indices[b]) { + return false; + } + } + return (pbvh->mpoly[a].flag & ME_SMOOTH) == (pbvh->mpoly[b].flag & ME_SMOOTH); } static bool grid_materials_match(const DMFlagMat *f1, const DMFlagMat *f2) @@ -180,30 +185,23 @@ static int partition_indices(int *prim_indices, int lo, int hi, int axis, float /* Returns the index of the first element on the right of the partition */ static int partition_indices_material(PBVH *pbvh, int lo, int hi) { - const MPoly *mpoly = pbvh->mpoly; const MLoopTri *looptri = pbvh->looptri; const DMFlagMat *flagmats = pbvh->grid_flag_mats; const int *indices = pbvh->prim_indices; - const void *first; int i = lo, j = hi; - if (pbvh->looptri) { - first = &mpoly[looptri[pbvh->prim_indices[lo]].poly]; - } - else { - first = &flagmats[pbvh->prim_indices[lo]]; - } - for (;;) { if (pbvh->looptri) { - for (; face_materials_match(first, &mpoly[looptri[indices[i]].poly]); i++) { + const int first = looptri[pbvh->prim_indices[lo]].poly; + for (; face_materials_match(pbvh, first, looptri[indices[i]].poly); i++) { /* pass */ } - for (; !face_materials_match(first, &mpoly[looptri[indices[j]].poly]); j--) { + for (; !face_materials_match(pbvh, first, looptri[indices[j]].poly); j--) { /* pass */ } } else { + const DMFlagMat *first = &flagmats[pbvh->prim_indices[lo]]; for (; grid_materials_match(first, &flagmats[indices[i]]); i++) { /* pass */ } @@ -424,12 +422,9 @@ static bool leaf_needs_material_split(PBVH *pbvh, int offset, int count) if (pbvh->looptri) { const MLoopTri *first = &pbvh->looptri[pbvh->prim_indices[offset]]; - const MPoly *mp = &pbvh->mpoly[first->poly]; - for (int i = offset + count - 1; i > offset; i--) { int prim = pbvh->prim_indices[i]; - const MPoly *mp_other = &pbvh->mpoly[pbvh->looptri[prim].poly]; - if (!face_materials_match(mp, mp_other)) { + if (!face_materials_match(pbvh, first->poly, pbvh->looptri[prim].poly)) { return true; } } @@ -557,6 +552,8 @@ void BKE_pbvh_build_mesh(PBVH *pbvh, pbvh->mesh = mesh; pbvh->header.type = PBVH_FACES; pbvh->mpoly = mpoly; + pbvh->material_indices = (const int *)CustomData_get_layer_named( + &mesh->pdata, CD_PROP_INT32, "material_index"); pbvh->mloop = mloop; pbvh->looptri = looptri; pbvh->verts = verts; |