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