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tornavis/source/blender/blenkernel/intern/mesh_wrapper.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
*
* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup bke
*
* The primary purpose of this API is to avoid unnecessary mesh conversion for the final
* output of a modified mesh.
*
* This API handles the case when the modifier stack outputs a mesh which does not have
* #Mesh data (#Mesh::faces(), corner verts, corner edges, edges, etc).
* Currently this is used so the resulting mesh can have #BMEditMesh data,
* postponing the converting until it's needed or avoiding conversion entirely
* which can be an expensive operation.
* Once converted, the meshes type changes to #ME_WRAPPER_TYPE_MDATA,
* although the edit mesh is not cleared.
*
* This API exposes functions that abstract over the different kinds of internal data,
* as well as supporting converting the mesh into regular mesh.
*/
#include "MEM_guardedalloc.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_modifier_types.h"
#include "DNA_object_types.h"
#include "BLI_ghash.h"
#include "BLI_math_matrix.h"
#include "BLI_math_vector.h"
#include "BLI_math_vector.hh"
#include "BLI_task.hh"
#include "BLI_threads.h"
#include "BLI_utildefines.h"
#include "BKE_DerivedMesh.hh"
#include "BKE_editmesh.hh"
#include "BKE_editmesh_cache.hh"
#include "BKE_lib_id.h"
#include "BKE_mesh.hh"
#include "BKE_mesh_runtime.hh"
#include "BKE_mesh_wrapper.hh"
#include "BKE_modifier.hh"
#include "BKE_object.hh"
#include "BKE_subdiv.hh"
#include "BKE_subdiv_mesh.hh"
#include "BKE_subdiv_modifier.hh"
#include "DEG_depsgraph.hh"
#include "DEG_depsgraph_query.hh"
using blender::float3;
using blender::Span;
Mesh *BKE_mesh_wrapper_from_editmesh(BMEditMesh *em,
const CustomData_MeshMasks *cd_mask_extra,
const Mesh *me_settings)
{
Mesh *me = static_cast<Mesh *>(BKE_id_new_nomain(ID_ME, nullptr));
BKE_mesh_copy_parameters_for_eval(me, me_settings);
BKE_mesh_runtime_ensure_edit_data(me);
me->runtime->wrapper_type = ME_WRAPPER_TYPE_BMESH;
if (cd_mask_extra) {
me->runtime->cd_mask_extra = *cd_mask_extra;
}
/* Use edit-mesh directly where possible. */
me->runtime->is_original_bmesh = true;
me->edit_mesh = static_cast<BMEditMesh *>(MEM_dupallocN(em));
me->edit_mesh->is_shallow_copy = true;
/* Make sure we crash if these are ever used. */
#ifdef DEBUG
me->totvert = INT_MAX;
me->totedge = INT_MAX;
me->faces_num = INT_MAX;
me->totloop = INT_MAX;
#else
me->totvert = 0;
me->totedge = 0;
me->faces_num = 0;
me->totloop = 0;
#endif
return me;
}
void BKE_mesh_wrapper_ensure_mdata(Mesh *me)
{
std::lock_guard lock{me->runtime->eval_mutex};
if (me->runtime->wrapper_type == ME_WRAPPER_TYPE_MDATA) {
return;
}
/* Must isolate multithreaded tasks while holding a mutex lock. */
blender::threading::isolate_task([&]() {
switch (static_cast<eMeshWrapperType>(me->runtime->wrapper_type)) {
case ME_WRAPPER_TYPE_MDATA:
case ME_WRAPPER_TYPE_SUBD: {
break; /* Quiet warning. */
}
case ME_WRAPPER_TYPE_BMESH: {
me->totvert = 0;
me->totedge = 0;
me->faces_num = 0;
me->totloop = 0;
BLI_assert(me->edit_mesh != nullptr);
BLI_assert(me->runtime->edit_data != nullptr);
BMEditMesh *em = me->edit_mesh;
BM_mesh_bm_to_me_for_eval(em->bm, me, &me->runtime->cd_mask_extra);
/* Adding original index layers here assumes that all BMesh Mesh wrappers are created from
* original edit mode meshes (the only case where adding original indices makes sense).
* If that assumption is broken, the layers might be incorrect because they might not
* actually be "original".
*
* There is also a performance aspect, where this also assumes that original indices are
* always needed when converting a BMesh to a mesh with the mesh wrapper system. That might
* be wrong, but it's not harmful. */
BKE_mesh_ensure_default_orig_index_customdata_no_check(me);
blender::bke::EditMeshData *edit_data = me->runtime->edit_data;
if (!edit_data->vertexCos.is_empty()) {
me->vert_positions_for_write().copy_from(edit_data->vertexCos);
me->runtime->is_original_bmesh = false;
}
if (me->runtime->wrapper_type_finalize) {
BKE_mesh_wrapper_deferred_finalize_mdata(me);
}
MEM_delete(me->runtime->edit_data);
me->runtime->edit_data = nullptr;
break;
}
}
/* Keep type assignment last, so that read-only access only uses the mdata code paths after all
* the underlying data has been initialized. */
me->runtime->wrapper_type = ME_WRAPPER_TYPE_MDATA;
});
}
/* -------------------------------------------------------------------- */
/** \name Mesh Coordinate Access
* \{ */
const float (*BKE_mesh_wrapper_vert_coords(const Mesh *mesh))[3]
{
switch (mesh->runtime->wrapper_type) {
case ME_WRAPPER_TYPE_BMESH:
if (mesh->runtime->edit_data->vertexCos.is_empty()) {
return nullptr;
}
return reinterpret_cast<const float(*)[3]>(mesh->runtime->edit_data->vertexCos.data());
case ME_WRAPPER_TYPE_MDATA:
case ME_WRAPPER_TYPE_SUBD:
return reinterpret_cast<const float(*)[3]>(mesh->vert_positions().data());
}
return nullptr;
}
const float (*BKE_mesh_wrapper_face_normals(Mesh *mesh))[3]
{
switch (mesh->runtime->wrapper_type) {
case ME_WRAPPER_TYPE_BMESH:
BKE_editmesh_cache_ensure_face_normals(mesh->edit_mesh, mesh->runtime->edit_data);
if (mesh->runtime->edit_data->faceNos.is_empty()) {
return nullptr;
}
return reinterpret_cast<const float(*)[3]>(mesh->runtime->edit_data->faceNos.data());
case ME_WRAPPER_TYPE_MDATA:
case ME_WRAPPER_TYPE_SUBD:
return reinterpret_cast<const float(*)[3]>(mesh->face_normals().data());
}
return nullptr;
}
void BKE_mesh_wrapper_tag_positions_changed(Mesh *mesh)
{
switch (mesh->runtime->wrapper_type) {
case ME_WRAPPER_TYPE_BMESH:
if (mesh->runtime->edit_data) {
mesh->runtime->edit_data->vertexNos = {};
mesh->runtime->edit_data->faceCos = {};
mesh->runtime->edit_data->faceNos = {};
}
break;
case ME_WRAPPER_TYPE_MDATA:
case ME_WRAPPER_TYPE_SUBD:
BKE_mesh_tag_positions_changed(mesh);
break;
}
}
void BKE_mesh_wrapper_vert_coords_copy(const Mesh *me, blender::MutableSpan<float3> positions)
{
switch (me->runtime->wrapper_type) {
case ME_WRAPPER_TYPE_BMESH: {
BMesh *bm = me->edit_mesh->bm;
blender::bke::EditMeshData *edit_data = me->runtime->edit_data;
if (!edit_data->vertexCos.is_empty()) {
positions.copy_from(edit_data->vertexCos);
}
else {
BMIter iter;
BMVert *v;
int i;
BM_ITER_MESH_INDEX (v, &iter, bm, BM_VERTS_OF_MESH, i) {
copy_v3_v3(positions[i], v->co);
}
}
return;
}
case ME_WRAPPER_TYPE_MDATA:
case ME_WRAPPER_TYPE_SUBD: {
positions.copy_from(me->vert_positions());
return;
}
}
BLI_assert_unreachable();
}
void BKE_mesh_wrapper_vert_coords_copy_with_mat4(const Mesh *me,
float (*vert_coords)[3],
int vert_coords_len,
const float mat[4][4])
{
switch (me->runtime->wrapper_type) {
case ME_WRAPPER_TYPE_BMESH: {
BMesh *bm = me->edit_mesh->bm;
BLI_assert(vert_coords_len == bm->totvert);
const blender::bke::EditMeshData *edit_data = me->runtime->edit_data;
if (!edit_data->vertexCos.is_empty()) {
for (int i = 0; i < vert_coords_len; i++) {
mul_v3_m4v3(vert_coords[i], mat, edit_data->vertexCos[i]);
}
}
else {
BMIter iter;
BMVert *v;
int i;
BM_ITER_MESH_INDEX (v, &iter, bm, BM_VERTS_OF_MESH, i) {
mul_v3_m4v3(vert_coords[i], mat, v->co);
}
}
return;
}
case ME_WRAPPER_TYPE_MDATA:
case ME_WRAPPER_TYPE_SUBD: {
BLI_assert(vert_coords_len == me->totvert);
const Span<float3> positions = me->vert_positions();
for (int i = 0; i < vert_coords_len; i++) {
mul_v3_m4v3(vert_coords[i], mat, positions[i]);
}
return;
}
}
BLI_assert_unreachable();
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Mesh Array Length Access
* \{ */
int BKE_mesh_wrapper_vert_len(const Mesh *me)
{
switch (me->runtime->wrapper_type) {
case ME_WRAPPER_TYPE_BMESH:
return me->edit_mesh->bm->totvert;
case ME_WRAPPER_TYPE_MDATA:
case ME_WRAPPER_TYPE_SUBD:
return me->totvert;
}
BLI_assert_unreachable();
return -1;
}
int BKE_mesh_wrapper_edge_len(const Mesh *me)
{
switch (me->runtime->wrapper_type) {
case ME_WRAPPER_TYPE_BMESH:
return me->edit_mesh->bm->totedge;
case ME_WRAPPER_TYPE_MDATA:
case ME_WRAPPER_TYPE_SUBD:
return me->totedge;
}
BLI_assert_unreachable();
return -1;
}
int BKE_mesh_wrapper_loop_len(const Mesh *me)
{
switch (me->runtime->wrapper_type) {
case ME_WRAPPER_TYPE_BMESH:
return me->edit_mesh->bm->totloop;
case ME_WRAPPER_TYPE_MDATA:
case ME_WRAPPER_TYPE_SUBD:
return me->totloop;
}
BLI_assert_unreachable();
return -1;
}
int BKE_mesh_wrapper_face_len(const Mesh *me)
{
switch (me->runtime->wrapper_type) {
case ME_WRAPPER_TYPE_BMESH:
return me->edit_mesh->bm->totface;
case ME_WRAPPER_TYPE_MDATA:
case ME_WRAPPER_TYPE_SUBD:
return me->faces_num;
}
BLI_assert_unreachable();
return -1;
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name CPU Subdivision Evaluation
* \{ */
static Mesh *mesh_wrapper_ensure_subdivision(Mesh *me)
{
SubsurfRuntimeData *runtime_data = (SubsurfRuntimeData *)me->runtime->subsurf_runtime_data;
if (runtime_data == nullptr || runtime_data->settings.level == 0) {
return me;
}
/* Initialize the settings before ensuring the descriptor as this is checked to decide whether
* subdivision is needed at all, and checking the descriptor status might involve checking if the
* data is out-of-date, which is a very expensive operation. */
SubdivToMeshSettings mesh_settings;
mesh_settings.resolution = runtime_data->resolution;
mesh_settings.use_optimal_display = runtime_data->use_optimal_display;
if (mesh_settings.resolution < 3) {
return me;
}
Subdiv *subdiv = BKE_subsurf_modifier_subdiv_descriptor_ensure(runtime_data, me, false);
if (subdiv == nullptr) {
/* Happens on bad topology, but also on empty input mesh. */
return me;
}
const bool use_clnors = runtime_data->use_loop_normals;
if (use_clnors) {
/* If custom normals are present and the option is turned on calculate the split
* normals and clear flag so the normals get interpolated to the result mesh. */
void *data = CustomData_add_layer(&me->loop_data, CD_NORMAL, CD_CONSTRUCT, me->totloop);
memcpy(data, me->corner_normals().data(), me->corner_normals().size_in_bytes());
}
Mesh *subdiv_mesh = BKE_subdiv_to_mesh(subdiv, &mesh_settings, me);
if (use_clnors) {
BKE_mesh_set_custom_normals(subdiv_mesh,
static_cast<float(*)[3]>(CustomData_get_layer_for_write(
&subdiv_mesh->loop_data, CD_NORMAL, me->totloop)));
CustomData_free_layers(&subdiv_mesh->loop_data, CD_NORMAL, me->totloop);
}
if (!ELEM(subdiv, runtime_data->subdiv_cpu, runtime_data->subdiv_gpu)) {
BKE_subdiv_free(subdiv);
}
if (subdiv_mesh != me) {
if (me->runtime->mesh_eval != nullptr) {
BKE_id_free(nullptr, me->runtime->mesh_eval);
}
me->runtime->mesh_eval = subdiv_mesh;
me->runtime->wrapper_type = ME_WRAPPER_TYPE_SUBD;
}
return me->runtime->mesh_eval;
}
Mesh *BKE_mesh_wrapper_ensure_subdivision(Mesh *me)
{
std::lock_guard lock{me->runtime->eval_mutex};
if (me->runtime->wrapper_type == ME_WRAPPER_TYPE_SUBD) {
return me->runtime->mesh_eval;
}
Mesh *result;
/* Must isolate multithreaded tasks while holding a mutex lock. */
blender::threading::isolate_task([&]() { result = mesh_wrapper_ensure_subdivision(me); });
return result;
}
/** \} */
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