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

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/depsgraph/intern/depsgraph_tag.cc b/source/blender/depsgraph/intern/depsgraph_tag.cc
index 21a6728c364..b00cae87311 100644
--- a/source/blender/depsgraph/intern/depsgraph_tag.cc
+++ b/source/blender/depsgraph/intern/depsgraph_tag.cc
@@ -230,6 +230,7 @@ void depsgraph_tag_to_component_opcode(const ID *id,
     case ID_RECALC_SOURCE:
       *component_type = NodeType::PARAMETERS;
       break;
+    case ID_RECALC_GEOMETRY_ALL_MODES:
     case ID_RECALC_ALL:
     case ID_RECALC_PSYS_ALL:
       BLI_assert(!"Should not happen");
@@ -705,6 +706,8 @@ const char *DEG_update_tag_as_string(IDRecalcFlag flag)
       return "TRANSFORM";
     case ID_RECALC_GEOMETRY:
       return "GEOMETRY";
+    case ID_RECALC_GEOMETRY_ALL_MODES:
+      return "GEOMETRY_ALL_MODES";
     case ID_RECALC_ANIMATION:
       return "ANIMATION";
     case ID_RECALC_PSYS_REDO: