Depsgraph: support flushing parameters without a full COW update

Avoid computationally expensive copying operations
when only some settings have been modified.

This is done by adding support for updating parameters
without tagging for copy-on-write.

Currently only mesh data blocks are supported,
other data-blocks can be added individually.

This prepares for changing values such as edit-mesh auto-smooth angle
in edit-mode without duplicating all mesh-data.
The benefit will only be seen when the user interface no longer tags
all ID's for copy on write updates.

ID_RECALC_GEOMETRY_ALL_MODES has been added to support situations
where non edit-mode geometry is modified in edit-mode.
While this isn't something user are likely to do,
Python scripts may change the underlying mesh.

Reviewed By: sergey

Ref D11377

3 files changed, 51 insertions, 3 deletions

diff --git a/source/blender/blenkernel/intern/lib_id_eval.c b/source/blender/blenkernel/intern/lib_id_eval.c
new file mode 100644
index 00000000000..140fe403ac3
--- /dev/null
+++ b/source/blender/blenkernel/intern/lib_id_eval.c
@@ -0,0 +1,48 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/** \file
+ * \ingroup bke
+ *
+ * Contains management of ID's and libraries
+ * allocate and free of all library data
+ */
+
+#include "DNA_ID.h"
+#include "DNA_mesh_types.h"
+
+#include "BLI_utildefines.h"
+
+#include "BKE_lib_id.h"
+#include "BKE_mesh.h"
+
+/**
+ * Copy relatives parameters, from `id` to `id_cow`.
+ * Use handle the #ID_RECALC_PARAMETERS tag.
+ * \note Keep in sync with #ID_TYPE_SUPPORTS_PARAMS_WITHOUT_COW.
+ */
+void BKE_id_eval_properties_copy(ID *id_cow, ID *id)
+{
+  const ID_Type id_type = GS(id->name);
+  BLI_assert((id_cow->tag & LIB_TAG_COPIED_ON_WRITE) && !(id->tag & LIB_TAG_COPIED_ON_WRITE));
+  BLI_assert(ID_TYPE_SUPPORTS_PARAMS_WITHOUT_COW(id_type));
+  if (id_type == ID_ME) {
+    BKE_mesh_copy_parameters((Mesh *)id_cow, (const Mesh *)id);
+  }
+  else {
+    BLI_assert_unreachable();
+  }
+}
diff --git a/source/blender/blenkernel/intern/mesh_validate.c b/source/blender/blenkernel/intern/mesh_validate.c
index df84cf6607f..bfdbf844a26 100644
--- a/source/blender/blenkernel/intern/mesh_validate.c
+++ b/source/blender/blenkernel/intern/mesh_validate.c
@@ -1105,7 +1105,7 @@ bool BKE_mesh_validate(Mesh *me, const bool do_verbose, const bool cddata_check_
                                        &changed);
 
   if (changed) {
-    DEG_id_tag_update(&me->id, ID_RECALC_GEOMETRY);
+    DEG_id_tag_update(&me->id, ID_RECALC_GEOMETRY_ALL_MODES);
     return true;
   }
 
@@ -1183,7 +1183,7 @@ bool BKE_mesh_validate_material_indices(Mesh *me)
   }
 
   if (!is_valid) {
-    DEG_id_tag_update(&me->id, ID_RECALC_GEOMETRY);
+    DEG_id_tag_update(&me->id, ID_RECALC_GEOMETRY_ALL_MODES);
     return true;
   }
 
diff --git a/source/blender/blenkernel/intern/paint.c b/source/blender/blenkernel/intern/paint.c
index 3494630e1fa..a7c6dc2deb9 100644
--- a/source/blender/blenkernel/intern/paint.c
+++ b/source/blender/blenkernel/intern/paint.c
@@ -1810,7 +1810,7 @@ void BKE_sculpt_color_layer_create_if_needed(struct Object *object)
 
   CustomData_add_layer(&orig_me->vdata, CD_PROP_COLOR, CD_DEFAULT, NULL, orig_me->totvert);
   BKE_mesh_update_customdata_pointers(orig_me, true);
-  DEG_id_tag_update(&orig_me->id, ID_RECALC_GEOMETRY);
+  DEG_id_tag_update(&orig_me->id, ID_RECALC_GEOMETRY_ALL_MODES);
 }
 
 /** \warning Expects a fully evaluated depsgraph. */