Embedded IDs (root nodetrees, master collection, etc.) pointer itself is
not editable, but their content may be overridden.
LibOverride code is supposed to know how to handle those embedded IDs.
While this is still very fuzzy in current code, this old behavior makes
it close to impossible to efficiently use out-of-main temp data, as it
implies that we'd need to update refcounts everytime we add something
back into BMain (an 'un-refcount' ID usages when removing from BMain).
Now that we have two separate flags/tags for those two different things,
let's not merge them anymore.
Note that this is somewhat on-going process, still needs more checks and
cleanup. Related to T88555.
Not all python-defined ID properties are overridable (yet), this needs
to be detected by libquery 'foreach id' code, such that those ID
pointers can be ignored by override code when working on override
hierarchies.
Fixes part of the issues found while investigating studio files (namely,
some py-defined ID pointer properties from rigify that are not currently
overridable would cause issues and false detections during resync).
Move the detection/decision of whether an ID pointer should be taken
into account in library override hierarchy processing to the LibQuery
area of code, by introducing a new callback flag.
This allows to factorize the test logic, be explicit in liboverride code
about ID relationships that can be ignored when exploring the override
hierarchy, and adds the possibility to do more checks about pointers to
be tagged as non-overridable in the future.
Note that all but the 'special' ID pointers (loop-back, embedded, etc.)
should be overridable. If some is not, relevant IDType 'foreach_id'
callback code is reponsible to tag it properly.
Python-defined IDProperties however are not systematicaly overridable
(yet), so this should allow us to detect that case and act accordingly
in an incomming commit.
No behavioral change expected in this commit.
The `MAX_LIBARRAY` define was an annoying doublon to the `INDEX_ID_MAX` enum value
now defined in `DNA_ID.h`, and it is no more useful.
And comments were somewhat outdated. Also added an explanation about
chosen order for the `INDEX_ID_<IDTYPE>` order.
With the option to detect orphaned data recursively (i.e. if ID `a` is the
only user of ID `b`, and ID `a` is unused, ID `b` will also get tagged
as unused).
To be used by the Purge operation.
`bmain.relations` is used to store temp data of relations between IDs,
to speed-up some complex processes heavily relying on such information.
Previous implementation was failry unclear/confusing, and required a
not-so-nice hack to 'tag' some ID as processed.
New code changes as such:
* Using `from`/`to` naming (instead of `user`/`used`).
* More clear separation between `to` `id_pointer` and `from` one,
using an union instead of hacking around difference between `ID *` and
`ID **` pointers.
* Adds storage of `session_uuid` informations (mainly useful as
debug/ensuring proper consistency of data currently).
* Adds a structure per ID in the mapping. This enables possibility of
storing tags (and potentially more data in the future) per-ID,
without polluting the IDs themselves with very short-life info.
Differential Revision: https://developer.blender.org/D10164
A simulation data block has an embedded node tree, which requires
special handling in a couple of places. Some of those places were
missing beforehand.
This also adds a relation to make sure that the simulation is evaluated
after animations on the embedded node tree are evaluated.
Now callbacks for animdata, nla strip and fcurve are in their own proper
BKE files (mimicking `foreach_id` callback of `IDTypeInfo`).
This commit also fixes some missing handling of ID pointers (text ID and
IDProperties of script fcurve modifier...).
That one was a bit more complicated, and is still only partial refactor
(ultimately we want to have a foreach_id callback in SpaceType itself I
think...).
