Blender Git Loki

Alembic: Fixes for linux buildbot and scons

Depsgraph tagging function for cached objects.

This is necessary to trigger object data updates for indirectly linked
objects, which would otherwise not be evaluated.

Convenience feature: When linking a cache library, always default it to
'read' mode locally.

Linking a cache library is meant to be used for getting existing cache
data into a file.

Left a comment in DerivedMesh.c explaining why the caching system has
to use the cumbersome cachedm pointer instead of virtual modifiers.

Use a dedicated input_dm pointer in the cache modifier to provide a mesh
result read from the cache.

Mixing this with the output_dm used for writing leads to undefined
situations where the DM was released but should actually be passed on.

Use correct flag enums for checking render/viewport eval mode when
writing derived mesh caches.

Fix for meaningless build error (no return value, can never happen).

Minor fix for UI code showing cache items.

Render/Viewport evaluation mode for cache libraries.

This designates a cache library to be used either for the viewport or
for renders. A "Render" cache library will evaluate modifiers with
render settings and a "Viewport" cache library will use viewport
(realtime) settings.

When reading the cache, the library will only be
used for the assigned purpose, i.e. a Render cache does not work for
viewport caching and vice-versa (although a cache can be baked for one
setting and then switched afterward).

Note that render results will never be visible in the realtime viewport
due to the way object evaluation is handled in Blender at this point
(render settings are only evaluated explicitly during renderer sync).

Conflicts:
source/blender/blenkernel/intern/particle_system.c

Allow the cache bake operator to overwrite existing files, using a
confirm dialog.

Removed now-unused util_path files from the pointcache lib.

Paths are constructed outside this module now. A valid absolute path
should always be provided through the API calls.

Record and display the last result of cache reading in the cache library
items.

Free readers properly after applying cached data.

Set reader/writer archive as a separate step outside the constructors.

This allows nicer creation of readers/writers //before// actually
opening the archive. This in turns can simplify code quite a bit.

Moved functions for constructing readers/writers based on cache library
out of pointcache into blenkernel.

This is quite simple and repetitive and there is not need to have this
in the main pointcache/Alembic API. The code is mostly concerned with
logic of DNA data, so pointcache shouldn't have to deal with it.

Ported archive filename constructor from pointcache library to BKE.

The pointcache library is now pretty much independent from ID blocks and
should not be responsible for handling file paths. The path construction
is also fairly straightforward now compared to the old point cache
system, with only basic conversion of relative to absolute paths for
loading archive files.

Cache read result enum in DNA mirroring the internal pointcache results.

This can be stored in cache library items as an indicator of cache
reading state.

Use a uiTemplate function for showing cache library items instead of
python code to unify symbols.

This is necessary because the operator for adding new items (as opposed
to the enable/disable button) cannot be shown with the same checkbox
button. The UI template function can display a custom button for the
operator, so the look becomes less confusing.

Nicer default filename for cache library paths.

This now appends a default extension based on the cache backend used.
At this point this is always Alembic (.abc) but would allow other
backend formats in the future.

Improved filtering for cache library content.

In addition to the object name filtering, items in cache library groups
can now be filtered by type as well.

Existing items in the cache are always displayed, so as to not hide
important information (what gets stored in the cache). The filtering
is primarily a utility to simplify searching inside the group for things
that should be added to the cache.