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/* 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 (#MPoly, #MLoop, #MEdge, #MVert).
* 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.h"
#include "BLI_task.h"
#include "BLI_threads.h"
#include "BLI_utildefines.h"
#include "BKE_editmesh.h"
#include "BKE_editmesh_cache.h"
#include "BKE_lib_id.h"
#include "BKE_mesh.h"
#include "BKE_mesh_runtime.h"
#include "BKE_mesh_wrapper.h"
#include "BKE_modifier.h"
#include "BKE_object.h"
#include "BKE_subdiv.h"
#include "BKE_subdiv_mesh.h"
#include "BKE_subdiv_modifier.h"
#include "DEG_depsgraph.h"
#include "DEG_depsgraph_query.h"
Mesh *BKE_mesh_wrapper_from_editmesh_with_coords(BMEditMesh *em,
const CustomData_MeshMasks *cd_mask_extra,
const float (*vert_coords)[3],
const Mesh *me_settings)
{
Mesh *me = BKE_id_new_nomain(ID_ME, NULL);
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 = true;
me->edit_mesh = 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->totpoly = INT_MAX;
me->totloop = INT_MAX;
#else
me->totvert = 0;
me->totedge = 0;
me->totpoly = 0;
me->totloop = 0;
#endif
EditMeshData *edit_data = me->runtime.edit_data;
edit_data->vertexCos = vert_coords;
return me;
}
Mesh *BKE_mesh_wrapper_from_editmesh(BMEditMesh *em,
const CustomData_MeshMasks *cd_mask_extra,
const Mesh *me_settings)
{
return BKE_mesh_wrapper_from_editmesh_with_coords(em, cd_mask_extra, NULL, me_settings);
}
static void mesh_wrapper_ensure_mdata_isolated(void *userdata)
{
Mesh *me = userdata;
const eMeshWrapperType geom_type_orig = me->runtime.wrapper_type;
me->runtime.wrapper_type = ME_WRAPPER_TYPE_MDATA;
switch (geom_type_orig) {
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->totpoly = 0;
me->totloop = 0;
BLI_assert(me->edit_mesh != NULL);
BLI_assert(me->runtime.edit_data != NULL);
BMEditMesh *em = me->edit_mesh;
BM_mesh_bm_to_me_for_eval(em->bm, me, &me->runtime.cd_mask_extra);
EditMeshData *edit_data = me->runtime.edit_data;
if (edit_data->vertexCos) {
BKE_mesh_vert_coords_apply(me, edit_data->vertexCos);
me->runtime.is_original = false;
}
break;
}
}
if (me->runtime.wrapper_type_finalize) {
BKE_mesh_wrapper_deferred_finalize(me, &me->runtime.cd_mask_extra);
}
}
void BKE_mesh_wrapper_ensure_mdata(Mesh *me)
{
ThreadMutex *mesh_eval_mutex = (ThreadMutex *)me->runtime.eval_mutex;
BLI_mutex_lock(mesh_eval_mutex);
if (me->runtime.wrapper_type == ME_WRAPPER_TYPE_MDATA) {
BLI_mutex_unlock(mesh_eval_mutex);
return;
}
/* Must isolate multithreaded tasks while holding a mutex lock. */
BLI_task_isolate(mesh_wrapper_ensure_mdata_isolated, me);
BLI_mutex_unlock(mesh_eval_mutex);
}
bool BKE_mesh_wrapper_minmax(const Mesh *me, float min[3], float max[3])
{
switch ((eMeshWrapperType)me->runtime.wrapper_type) {
case ME_WRAPPER_TYPE_BMESH:
return BKE_editmesh_cache_calc_minmax(me->edit_mesh, me->runtime.edit_data, min, max);
case ME_WRAPPER_TYPE_MDATA:
case ME_WRAPPER_TYPE_SUBD:
return BKE_mesh_minmax(me, min, max);
}
BLI_assert_unreachable();
return false;
}
/* -------------------------------------------------------------------- */
/** \name Mesh Coordinate Access
* \{ */
void BKE_mesh_wrapper_vert_coords_copy(const Mesh *me,
float (*vert_coords)[3],
int vert_coords_len)
{
switch ((eMeshWrapperType)me->runtime.wrapper_type) {
case ME_WRAPPER_TYPE_BMESH: {
BMesh *bm = me->edit_mesh->bm;
BLI_assert(vert_coords_len <= bm->totvert);
EditMeshData *edit_data = me->runtime.edit_data;
if (edit_data->vertexCos != NULL) {
for (int i = 0; i < vert_coords_len; i++) {
copy_v3_v3(vert_coords[i], edit_data->vertexCos[i]);
}
}
else {
BMIter iter;
BMVert *v;
int i;
BM_ITER_MESH_INDEX (v, &iter, bm, BM_VERTS_OF_MESH, i) {
copy_v3_v3(vert_coords[i], v->co);
}
}
return;
}
case ME_WRAPPER_TYPE_MDATA:
case ME_WRAPPER_TYPE_SUBD: {
BLI_assert(vert_coords_len <= me->totvert);
const MVert *mvert = me->mvert;
for (int i = 0; i < vert_coords_len; i++) {
copy_v3_v3(vert_coords[i], mvert[i].co);
}
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 ((eMeshWrapperType)me->runtime.wrapper_type) {
case ME_WRAPPER_TYPE_BMESH: {
BMesh *bm = me->edit_mesh->bm;
BLI_assert(vert_coords_len == bm->totvert);
EditMeshData *edit_data = me->runtime.edit_data;
if (edit_data->vertexCos != NULL) {
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 MVert *mvert = me->mvert;
for (int i = 0; i < vert_coords_len; i++) {
mul_v3_m4v3(vert_coords[i], mat, mvert[i].co);
}
return;
}
}
BLI_assert_unreachable();
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Mesh Array Length Access
* \{ */
int BKE_mesh_wrapper_vert_len(const Mesh *me)
{
switch ((eMeshWrapperType)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 ((eMeshWrapperType)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 ((eMeshWrapperType)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_poly_len(const Mesh *me)
{
switch ((eMeshWrapperType)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->totpoly;
}
BLI_assert_unreachable();
return -1;
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name CPU Subdivision Evaluation
* \{ */
static Mesh *mesh_wrapper_ensure_subdivision(const Object *ob, Mesh *me)
{
SubsurfModifierData *smd = BKE_object_get_last_subsurf_modifier(ob);
if (!smd) {
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 = me->runtime.subsurf_resolution;
mesh_settings.use_optimal_display = me->runtime.subsurf_use_optimal_display;
if (mesh_settings.resolution < 3) {
return me;
}
const bool apply_render = me->runtime.subsurf_apply_render;
SubdivSettings subdiv_settings;
BKE_subsurf_modifier_subdiv_settings_init(&subdiv_settings, smd, apply_render);
if (subdiv_settings.level == 0) {
return me;
}
SubsurfRuntimeData *runtime_data = BKE_subsurf_modifier_ensure_runtime(smd);
Subdiv *subdiv = BKE_subsurf_modifier_subdiv_descriptor_ensure(smd, &subdiv_settings, me, false);
if (subdiv == NULL) {
/* Happens on bad topology, but also on empty input mesh. */
return me;
}
Mesh *subdiv_mesh = BKE_subdiv_to_mesh(subdiv, &mesh_settings, me);
if (subdiv != runtime_data->subdiv) {
BKE_subdiv_free(subdiv);
}
if (subdiv_mesh != me) {
if (me->runtime.mesh_eval != NULL) {
BKE_id_free(NULL, me->runtime.mesh_eval);
}
me->runtime.mesh_eval = subdiv_mesh;
me->runtime.wrapper_type = ME_WRAPPER_TYPE_SUBD;
}
return me->runtime.mesh_eval;
}
typedef struct SubdivisionWrapperIsolatedTaskData {
const Object *ob;
Mesh *me;
Mesh *result;
} SubdivisionWrapperIsolatedTaskData;
static void mesh_wrapper_ensure_subdivision_isolated(void *userdata)
{
SubdivisionWrapperIsolatedTaskData *task_data = (SubdivisionWrapperIsolatedTaskData *)userdata;
const Object *ob = task_data->ob;
Mesh *me = task_data->me;
task_data->result = mesh_wrapper_ensure_subdivision(ob, me);
}
Mesh *BKE_mesh_wrapper_ensure_subdivision(const Object *ob, Mesh *me)
{
ThreadMutex *mesh_eval_mutex = (ThreadMutex *)me->runtime.eval_mutex;
BLI_mutex_lock(mesh_eval_mutex);
if (me->runtime.wrapper_type == ME_WRAPPER_TYPE_SUBD) {
BLI_mutex_unlock(mesh_eval_mutex);
return me->runtime.mesh_eval;
}
SubdivisionWrapperIsolatedTaskData task_data;
task_data.ob = ob;
task_data.me = me;
/* Must isolate multithreaded tasks while holding a mutex lock. */
BLI_task_isolate(mesh_wrapper_ensure_subdivision_isolated, &task_data);
BLI_mutex_unlock(mesh_eval_mutex);
return task_data.result;
}
/** \} */
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