Commit Graph

98 Commits

Author SHA1 Message Date
Hans Goudey
8f27baf388 Merge branch 'blender-v4.0-release' 2023-10-09 23:54:43 +02:00
Hans Goudey
976eaae02f Cleanup: Move BKE_object.hh to C++
Simplifies the fix to #111120, where the object bounds functions
may return a C++ type instead of `BoundBox`.

Pull Request: https://projects.blender.org/blender/blender/pulls/113462
2023-10-09 23:41:53 +02:00
Jeroen Bakker
03040f3b7f Cleanup: Make format 2023-10-09 12:49:02 +02:00
Bastien Montagne
df0d7c9c3d WM Jobs: Refactor all worker status variables into a single shared struct.
Move the three current 'status variables' (stop, update and progress)
into a single 'WorkerStatus' struct. This is cleaner and will allow for
future workin this area without having to edit tens of 'startjob'
callbacks signatures all the time.

No functional change expected here.

Note: jobs' specific internal code has been modified as little as
possible, in many cases the job's own data still just store pointers to
these three values. Ideally in the future more refactor will be using a
single pointer to the shared `wmJobWorkerStatus` data instead.

Pull Request: https://projects.blender.org/blender/blender/pulls/113343
2023-10-09 12:12:22 +02:00
Campbell Barton
3859a08704 Cleanup: use the name 'ot' for wmOperatorType for unused arguments 2023-10-05 13:55:35 +11:00
Campbell Barton
e38ff7c06d Cleanup: use C++ comments for disabled code 2023-09-25 17:06:04 +10:00
Hans Goudey
867f99c2af Cleanup: Move depsgraph headers to C++
Pull Request: https://projects.blender.org/blender/blender/pulls/110816
2023-09-22 03:18:17 +02:00
Hans Goudey
be68db8ff9 Geometry Nodes: Show node group in modifier UI after duplication
When duplicating the node group from the geometry node editor, show the
data-block selector in the modifier interface. Otherwise it's not clear
that the modifier is using a local data-block, not the original asset.
2023-09-08 10:03:16 -04:00
Damien Picard
ea974b6681 UI: fix and improve a few messages
- Multiple issues in the Data Transfer modifier error messages:
  - "None" -> "none", this word in the middle of a sentence, no need
    for upper case.
  - "amount of <element>" -> "number", more appropriate for discrete
    counts.
  - "doesn't" -> "does not", to respect Blender's style guide.
- "The grease pencil object need an Armature modifier" -> "needs",
  grammar.
- "Armature modifier is not valid or wrong defined" -> "is invalid".
  Unclear what "wrong defined" means.
- The "Recent Reports" text block has not been used since 2.81.
- "Not valid subdivisions found to rebuild lower levels" -> "No
  valid...", typo.
- "extensions repository" -> "extension repository": typo.
- "... , but loose correct blending..." -> "lose": typo.
- "True when multiple enums ": trailing whitespace.
- "Number of ray per pixel" -> "rays": typo.
- "Curve Parameter node" -> "Spline ...": this is the actual name of
  the node after its rename in 1cd9fcd98d.

Pull Request: https://projects.blender.org/blender/blender/pulls/111145
2023-08-29 14:49:02 +02:00
Sybren A. Stüvel
998136f7a7 Anim: replace Bone Groups & Armature Layers with Bone Collections
Armature layers (the 32 little dots) and bone groups are replaced with
Bone Collections:

- Bone collections are stored on the armature, and have a name that is
  unique within that armature.
- An armature can have an arbitrary number of bone collections (instead
  of the fixed 32 layers).
- Bones can be assigned to zero or more bone collections.
- Bone collections have a visibility setting, just like objects in scene
  collections.
- When a bone is in at least one collection, and all its collections in
  are hidden, the bone is hidden. In other cases (in any visible
  collection, or in no collection at all), the bone visibility is
  determined by its own 'hidden' flag.
- For now, bone collections cannot be nested; they are a flat list just
  like bone groups were. Nestability of bone collections is intended to
  be implemented in a later 4.x release.
- Since bone collections are defined on the armature, they can be used
  from both pose mode and edit mode.

Versioning converts bone groups and armature layers to new bone
collections. Layers that do not contain any bones are skipped. The old
data structures remain in DNA and are unaltered, for limited forward
compatibility. That way at least a save with Blender 4.0 will not
immediately erase the bone group and armature layers and their bone
assignments.

Shortcuts:

- M/Shift+M in pose/edit mode: move to collection (M) and add to
  collection (shift+M). This works similar to the M/Shift+M menus for
  objects & scene collections.
- Ctrl+G in pose mode shows a port of the old 'bone groups' menu. This
  is likely to be removed in the near future, as the functionality
  overlaps with the M/Shift+M menus.

This is the first commit of a series; the bone collections feature will
be improved before the Blender 4.0 release. See #108941 for more info.

Pull request: https://projects.blender.org/blender/blender/pulls/109976
2023-08-29 14:31:18 +02:00
Hans Goudey
a1dceeec00 Fix #110516: Geometry nodes use attribute toggle boolean values broken
The toggle was added before boolean IDProperties were added. The fix is
to support both integer types and boolean types, similar to a recent
change for other inputs, 9f30555faf.

Pull Request: https://projects.blender.org/blender/blender/pulls/111433
2023-08-24 13:36:25 +02:00
Jesse Yurkovich
f30ac938de Cleanup: Reduce unnecessary mesh position copying
Continuation of #103789 to remove/reduce the copying of mesh position
data.

Pull Request: https://projects.blender.org/blender/blender/pulls/111313
2023-08-22 03:51:53 +02:00
Hans Goudey
f0467b4615 Cleanup: Return std::string from operator name and description callbacks
With the end goal of simplifying ownership and memory management,
and allowing the use of `get_name` in contexts without statically
allocated strings, use `std::string` for the return values of these two
operator type callbacks instead of `const char *` and `char *`.

In the meantime things get uglier in some places. I'd expect `std::string`
to be used more in the future elsewhere in Blender though.

Pull Request: https://projects.blender.org/blender/blender/pulls/110823
2023-08-11 19:11:27 +02:00
Jacques Lucke
cc4d5c432c RNA: move headers to C++
Also see #103343.

Pull Request: https://projects.blender.org/blender/blender/pulls/111022
2023-08-10 22:40:27 +02:00
Aras Pranckevicius
d973355b3a Cleanup: reduce amount of math-related includes
Using ClangBuildAnalyzer on the whole Blender build, it was pointing
out that BLI_math.h is the heaviest "header hub" (i.e. non tiny file
that is included a lot).

However, there's very little (actually zero) source files in Blender
that need "all the math" (base, colors, vectors, matrices,
quaternions, intersection, interpolation, statistics, solvers and
time). A common use case is source files needing just vectors, or
just vectors & matrices, or just colors etc. Actually, 181 files
were including the whole math thing without needing it at all.

This change removes BLI_math.h completely, and instead in all the
places that need it, includes BLI_math_vector.h or BLI_math_color.h
and so on.

Change from that:
- BLI_math_color.h was included 1399 times -> now 408 (took 114.0sec
  to parse -> now 36.3sec)
- BLI_simd.h 1403 -> 418 (109.7sec -> 34.9sec).

Full rebuild of Blender (Apple M1, Xcode, RelWithDebInfo) is not
affected much (342sec -> 334sec). Most of benefit would be when
someone's changing BLI_simd.h or BLI_math_color.h or similar files,
that now there's 3x fewer files result in a recompile.

Pull Request #110944
2023-08-10 14:51:40 +03:00
Hans Goudey
ffe4fbe832 Cleanup: Move editors headers to C++
See #103343

Pull Request: https://projects.blender.org/blender/blender/pulls/110820
2023-08-05 02:57:52 +02:00
Hans Goudey
bc8c892c65 Cleanup: Move WM headers to C++
Also move a few more headers that included WM headers.

Pull Request: https://projects.blender.org/blender/blender/pulls/110815
2023-08-04 23:11:22 +02:00
Hans Goudey
dc7979a056 Cleanup: Make geometry set naming more consistent
Remove the "_for_read" suffix from methods to get geometry and geometry
components. That should be considered the default, so the suffix just
adds unnecessary text. This is consistent with the attribute API and
various implicit sharing data access methods.

Use "from_mesh" instead of "create_with_mesh". This is consistent with
the recently used naming for the `IndexMask` API.

Pull Request: https://projects.blender.org/blender/blender/pulls/110738
2023-08-03 17:09:18 +02:00
Hans Goudey
731d296f35 Cleanup: Move mesh related blenkernel headers to C++
See #103343

Pull Request: https://projects.blender.org/blender/blender/pulls/110730
2023-08-02 22:14:18 +02:00
Sybren A. Stüvel
e604f3db91 Refactor: Anim, abstractions for armature layers
Add an API for armature layer access. Instead of accessing `arm->layer`
and friends directly, the code now uses this API. This will make things
easier to replace by bone collections in the future.

The functions are named "bonecoll" (short for "bone collection"), as
that's the soon-to-be-introduced replacement for armature layers. This
API is the first step towards that replacement, and should help to
reduce the changes necessary when functional changes are committed.

This also creates a new module `source/blender/animrig` for Animation &
Rigging code. This will, for example, house the bone collection system
in the near future.

There is a bunch of code currently spread across blenkernel and editors
in a rather ad-hoc way; it is intended that at some point that code gets
moved into `animrig` as well (or at least the subset of that code where
such a move makes sense; brain still required).

Ref: #108941

No functional changes.
2023-07-27 14:57:01 +02:00
Campbell Barton
cc892efcd4 Cleanup: use snake case, especially for structs that define callbacks
Use snake case for ShaderFxTypeInfo, ModifierTypeInfo,
GpencilModifierTypeInfo & bConstraintTypeInfo.
2023-07-27 12:21:06 +10:00
Hans Goudey
95edff7495 Cleanup: Rename mesh custom data fields
Implements the rest of #101689, after 5e9ea9243b.

- `vdata` -> `vert_data`
- `edata` -> `edge_data`
- `pdata` -> `face_data`
- `ldata` -> `loop_data`

A deeper rename of `loop` to `corner` will be proposed as a next
step, and renaming `totvert` and `totedge` can be done separately.

Pull Request: https://projects.blender.org/blender/blender/pulls/110432
2023-07-25 21:15:52 +02:00
Hans Goudey
5e9ea9243b Mesh: Rename "polys" to "faces"
Implements part of #101689.

The "poly" name was chosen to distinguish the `MLoop` + `MPoly`
combination from the `MFace` struct it replaced. Those two structures
persisted together for a long time, but nowadays `MPoly` is gone, and
`MFace` is only used in some legacy code like the particle system.

To avoid unnecessarily using a different term, increase consistency
with the UI and with BMesh, and generally make code a bit easier to
read, this commit replaces the `poly` term with `poly`. Most variables
that use the term are renamed too. `Mesh.totface` and `Mesh.fdata` now
have a `_legacy` suffix to reduce confusion. In a next step, `pdata`
can be renamed to `face_data` as well.

Pull Request: https://projects.blender.org/blender/blender/pulls/109819
2023-07-24 22:06:55 +02:00
Philipp Oeser
2cb9290012 Fix #110021: Deform modifier binding can go wrong in certain stacks
This affected `Mesh Deform`, `Corrective Smooth` and `Laplacian Smooth`.

Exposed by 57ea827bfb (e5ec04d73c).

Evaluating the incoming mesh can be different in
`BKE_object_handle_data_update` as opposed to
`object_force_modifier_update_for_bind` due to different
`CustomData_MeshMasks` being used (the former used a handpicked set, the
later was still using `CD_MASK_BAREMESH`). But since moving many
relevant [to modifiers] data to attributes, this could lead to binding go
wrong (e.g. reporting a vertex count mismatch as reported in #110021
which was due to the fact that creases were not propagated and that
changed the output [also vertex count] of a subdivision modifier in the
stack).

Now use `CD_MASK_DERIVEDMESH` in `object_force_modifier_update_for_bind`
to get all relevant attributes for evaluation (this is not used in `BKE_object_handle_data_update`
to avoid a big performance impact there).

Also fixes #109626 afaict.

Should probably go into 3.6 LTS (maybe even 3.3 LTS).

Pull Request: https://projects.blender.org/blender/blender/pulls/110095
2023-07-17 09:31:46 +02:00
Hans Goudey
ec29d96d11 Cleanup: Simplify replacing component data in geometry set 2023-07-07 09:59:55 -04:00
Campbell Barton
cf29e011be Cleanup: remove all strcpy calls in source/blender/editors/
Replace with STRNCPY or BLI_strncpy, while many cases were safe,
translated source strings could cause buffer overflows, see: #108917.
2023-06-19 11:58:33 +10:00
Hans Goudey
f4124ee02d Cleanup: Move GeometrySet and components to proper namespace
Move `GeometrySet` and `GeometryComponent` and subclasses
to the `blender::bke` namespace. This wasn't done earlier since
these were one of the first C++ classes used throughout Blender,
but now it is common.

Also remove the now-unnecessary C-header, since all users of
the geometry set header are now in C++.

Pull Request: https://projects.blender.org/blender/blender/pulls/109020
2023-06-15 22:18:28 +02:00
Campbell Barton
87ff8ee09a Cleanup: disambiguate the term 'path'
Use filepath or dirpath, unless the contents might be either,
in that case note that the contents could be both.
Use `rna_path*` in some cases too.
2023-06-05 10:57:34 +10:00
Campbell Barton
74dd0ed09e Cleanup: remove redundant struct qualifiers 2023-06-03 08:54:37 +10:00
Sergey Sharybin
c1bc70b711 Cleanup: Add a copyright notice to files and use SPDX format
A lot of files were missing copyright field in the header and
the Blender Foundation contributed to them in a sense of bug
fixing and general maintenance.

This change makes it explicit that those files are at least
partially copyrighted by the Blender Foundation.

Note that this does not make it so the Blender Foundation is
the only holder of the copyright in those files, and developers
who do not have a signed contract with the foundation still
hold the copyright as well.

Another aspect of this change is using SPDX format for the
header. We already used it for the license specification,
and now we state it for the copyright as well, following the
FAQ:

    https://reuse.software/faq/
2023-05-31 16:19:06 +02:00
Hans Goudey
66d20c8723 Cleanup: Simplofy use of modifier eval context flags 2023-05-30 16:43:02 -04:00
Hans Goudey
4d841e1b35 Mesh: Reimplement and unify topology maps
Combine the newer less efficient C++ implementations and the older
less convenient C functions. The maps now contain one large array of
indices, split into groups by a separate array of offset indices.
Though performance of creating the maps is relatively unchanged, the
new implementation uses 4 bytes less per source element than the C
maps, and 20 bytes less than the newer C++ functions (which also
had more overhead with larger N-gons). The usage syntax is simpler
than the C functions as well.

The reduced memory usage is helpful for when these maps are cached
in the near future. It will also allow sharing the offsets between
maps for different domains like vertex to corner and vertex to face.

A simple `GroupedSpan` class is introduced to make accessing the
topology maps much simpler. It combines offset indices and a separate
span, splitting it into chunks in an efficient way.

Pull Request: https://projects.blender.org/blender/blender/pulls/107861
2023-05-24 13:16:57 +02:00
Campbell Barton
3958ae7241 Cleanup: use STRNCPY, SNPRINTF macros 2023-05-09 14:08:19 +10:00
Campbell Barton
6859bb6e67 Cleanup: format (with BraceWrapping::AfterControlStatement "MultiLine") 2023-05-02 09:37:49 +10:00
Campbell Barton
0a7f2486ec Fix apply as shape operator accessing properties that don't exist 2023-04-30 15:08:27 +10:00
Hans Goudey
2ab500c234 Cleanup: Remove unnecessary point cloud function argument
The "nomain to main" function for point clouds now always takes
ownership of the source data-block, just like the mesh version.
2023-04-19 15:52:56 -04:00
Hans Goudey
2a4323c2f5 Mesh: Move edges to a generic attribute
Implements #95966, as the final step of #95965.

This commit changes the storage of mesh edge vertex indices from the
`MEdge` type to the generic `int2` attribute type. This follows the
general design for geometry and the attribute system, where the data
storage type and the usage semantics are separated.

The main benefit of the change is reduced memory usage-- the
requirements of storing mesh edges is reduced by 1/3. For example,
this saves 8MB on a 1 million vertex grid. This also gives performance
benefits to any memory-bound mesh processing algorithm that uses edges.

Another benefit is that all of the edge's vertex indices are
contiguous. In a few cases, it's helpful to process all of them as
`Span<int>` rather than `Span<int2>`. Similarly, the type is more
likely to match a generic format used by a library, or code that
shouldn't know about specific Blender `Mesh` types.

Various Notes:
- The `.edge_verts` name is used to reflect a mapping between domains,
  similar to `.corner_verts`, etc. The period means that it the data
  shouldn't change arbitrarily by the user or procedural operations.
- `edge[0]` is now used instead of `edge.v1`
- Signed integers are used instead of unsigned to reduce the mixing
  of signed-ness, which can be error prone.
- All of the previously used core mesh data types (`MVert`, `MEdge`,
  `MLoop`, `MPoly` are now deprecated. Only generic types are used).
- The `vec2i` DNA type is used in the few C files where necessary.

Pull Request: https://projects.blender.org/blender/blender/pulls/106638
2023-04-17 13:47:41 +02:00
Jacques Lucke
7eee378ecc Custom Data: support implicit sharing for custom data layers
This integrates the new implicit-sharing system (from fbcddfcd68)
with `CustomData`. Now the potentially long arrays referenced by custom
data layers can be shared between different systems but most importantly
between different geometries. This makes e.g. copying a mesh much cheaper
because none of the attributes has to be copied. Only when an attribute
is modified does it have to be copied.

Also see the original design task: #95845.

This reduces memory and improves performance by avoiding unnecessary
data copies. For example, the used memory after loading a highly
subdivided mesh is reduced from 2.4GB to 1.79GB. This is about 25%
less which is the expected amount because in `main` there are 4 copies
of the data:
1. The original data which is allocated when the file is loaded.
2. The copy for the depsgraph allocated during depsgraph evaluation.
3. The copy for the undo system allocated when the first undo step is
  created right after loading the file.
4. GPU buffers allocated for drawing.

This patch only gets rid of copy number 2 for the depsgraph. In theory
the other copies can be removed as part of follow up PRs as well though.

-----

The patch has three main components:
* Slightly modified `CustomData` API to make it work better with implicit
  sharing:
  * `CD_REFERENCE` and `CD_DUPLICATE` have been removed because they are
    meaningless when implicit-sharing is used.
  * `CD_ASSIGN` has been removed as well because it's not an allocation
    type anyway. The functionality of using existing arrays as custom
    data layers has not been removed though.
  * This can still be done with `CustomData_add_layer_with_data` which
    also has a new argument that allows passing in information about
    whether the array is shared.
  * `CD_FLAG_NOFREE` has been removed because it's no longer necessary. It
    only existed because of `CD_REFERENCE`.
  * `CustomData_copy` and `CustomData_merge` have been split up into a
    functions that do copy the actual attribute values and those that do
    not. The latter functions now have the `_layout` suffix
    (e.g. `CustomData_copy_layout`).
* Changes in `customdata.cc` to make it actually use implicit-sharing.
* Changes in various other files to adapt to the changes in `BKE_customdata.h`.

Pull Request: https://projects.blender.org/blender/blender/pulls/106228
2023-04-13 14:57:57 +02:00
Jacques Lucke
92b607d686 CustomData: add separate function to add layer from existing data
This simplifies the usage of the API and is preparation for #104478.

The `CustomData_add_layer` and `CustomData_add_layer_named` now have corresponding
`*_with_data` functions that should be used when creating the layer from existing data.

Pull Request: https://projects.blender.org/blender/blender/pulls/105708
2023-03-14 15:30:26 +01:00
Falk David
df0c2693b6 Refactor: Rename grease pencil files to legacy
This renames the `BKE_gpencil_*` as well as the `DNA_gpencil_types.h`
files to indicate that it's the legacy grease pencil.

Pull Request: https://projects.blender.org/blender/blender/pulls/105597
2023-03-13 10:42:51 +01:00
Hans Goudey
1dc57a89e9 Mesh: Move functions to C++ header
Refactoring mesh code, it has become clear that local cleanups and
simplifications are limited by the need to keep a C public API for
mesh functions. This change makes code more obvious and makes further
refactoring much easier.

- Add a new `BKE_mesh.hh` header for a C++ only mesh API
- Introduce a new `blender::bke::mesh` namespace, documented here:
  https://wiki.blender.org/wiki/Source/Objects/Mesh#Namespaces
- Move some functions to the new namespace, cleaning up their arguments
- Move code to `Array` and `float3` where necessary to use the new API
- Define existing inline mesh data access functions to the new header
- Keep some C API functions where necessary because of RNA
- Move all C++ files to use the new header, which includes the old one

In the future it may make sense to split up `BKE_mesh.hh` more, but for
now keeping the same name as the existing header keeps things simple.

Pull Request: https://projects.blender.org/blender/blender/pulls/105416
2023-03-12 22:29:15 +01:00
Falk David
53bb713eda Refactor: Rename OB_GPENCIL and ID_GD
This renames the `OB_GPENCIL` object type and the `ID_GD` to `OB_GPENCIL_LEGACY` and `ID_GD_LEGACY` respectively.
There is no change for the user.

Pull Request: https://projects.blender.org/blender/blender/pulls/105541
2023-03-08 12:35:58 +01:00
Hans Goudey
3022a805ca Cleanup: Standardize mesh edge and poly naming
With the goal of clearly differentiating between arrays and single
elements, improving consistency across Blender, and using wording
that's easier to read and say, change variable names for Mesh edges
and polygons/faces.

Common renames are the following, with some extra prefixes, etc.
 - `mpoly` -> `polys`
 - `mpoly`/`mp`/`p` -> `poly`
 - `medge` -> `edges`
 - `med`/`ed`/`e` -> `edge`

`MLoop` variables aren't affected because they will be replaced
when they're split up into to arrays in #104424.
2023-03-01 15:58:01 -05:00
Campbell Barton
91346755ce Cleanup: use '#' prefix for issues instead of 'T'
Match the convention from Gitea instead of Phabricator's T for tasks.
2023-02-12 14:56:05 +11:00
Hans Goudey
7ca651d182 Mesh: Remove unnecessary edge draw flag
As described in #95966, replace the `ME_EDGEDRAW` flag with a bit
vector in mesh runtime data. Currently the the flag is only ever set
to false for the "optimal display" feature of the subdivision surface
modifier. When creating an "original" mesh in the main data-base,
the flag is always supposed to be true.

The bit vector is now created by the modifier only as necessary, and
is cleared for topology-changing operations. This fixes incorrect
interpolation of the flag as noted in #104376. Generally it isn't
possible to interpolate it through topology-changing operations.

After this, only the seam status needs to be removed from edges before
we can replace them with the generic `int2` type (or something similar)
and reduce memory usage by 1/3.

Related:
- 10131a6f62
- 145839aa42

In the future `BM_ELEM_DRAW` could be removed as well. Currently it is
used and aliased by other defines in some non-obvious ways though.

Pull Request #104417
2023-02-09 15:56:05 +01:00
Jacques Lucke
2995165148 Cleanup: simplify wrapping CurvesGeometry in C++ 2023-01-31 18:45:55 +01:00
Alexander Gavrilov
f7dd7d5454 Python API: add a method for reordering modifiers.
Add an `object.modifiers.move()` method, similar to the one
for constraints and some other collections. Currently reordering
modifiers requires using operators, which depend on context.

The implementation is straightforward, except for the need to
make the severity of errors reported by the underlying editor
code into a parameter, so that the new Python API function
reports any problems as Python exceptions, and refactoring
the code to allow aborting a blocked move before making any
changes. I also turn the negative index condition from an assert
into an error.

Differential Revision: https://developer.blender.org/D16966
2023-01-26 14:56:58 +02:00
Hans Goudey
3a3d9488a1 Refactor: Const correct Custom Data API, prepare for CoW
Currently you can retrieve a mutable array from a const CustomData.
That makes code unsafe since the compiler can't check for correctness
itself. Fix that by introducing a separate function to retrieve mutable
arrays from CustomData. The new functions have the `_for_write`
suffix that make the code's intention clearer.

Because it makes retrieving write access an explicit step, this change
also makes proper copy-on-write possible for attributes.

Notes:
- The previous "duplicate referenced layer" functions are redundant
  with retrieving layers with write access
- The custom data functions that give a specific index only have
  `for_write` to simplify the API

Differential Revision: https://developer.blender.org/D14140
2023-01-13 17:22:07 -06:00
Damien Picard
30c90f0ad0 Cleanup: Replace "UV's" with "UVs"
An apostrophe should not be used because it is not a mark of plural,
even for initialisms. This involves mostly comments, but a few UI
messages are affected as well.

Differential Revision: https://developer.blender.org/D16749
2023-01-10 14:50:13 -05:00
Hans Goudey
1af62cb3bf Mesh: Move positions to a generic attribute
**Changes**
As described in T93602, this patch removes all use of the `MVert`
struct, replacing it with a generic named attribute with the name
`"position"`, consistent with other geometry types.

Variable names have been changed from `verts` to `positions`, to align
with the attribute name and the more generic design (positions are not
vertices, they are just an attribute stored on the point domain).

This change is made possible by previous commits that moved all other
data out of `MVert` to runtime data or other generic attributes. What
remains is mostly a simple type change. Though, the type still shows up
859 times, so the patch is quite large.

One compromise is that now `CD_MASK_BAREMESH` now contains
`CD_PROP_FLOAT3`. With the general move towards generic attributes
over custom data types, we are removing use of these type masks anyway.

**Benefits**
The most obvious benefit is reduced memory usage and the benefits
that brings in memory-bound situations. `float3` is only 3 bytes, in
comparison to `MVert` which was 4. When there are millions of vertices
this starts to matter more.

The other benefits come from using a more generic type. Instead of
writing algorithms specifically for `MVert`, code can just use arrays
of vectors. This will allow eliminating many temporary arrays or
wrappers used to extract positions.

Many possible improvements aren't implemented in this patch, though
I did switch simplify or remove the process of creating temporary
position arrays in a few places.

The design clarity that "positions are just another attribute" brings
allows removing explicit copying of vertices in some procedural
operations-- they are just processed like most other attributes.

**Performance**
This touches so many areas that it's hard to benchmark exhaustively,
but I observed some areas as examples.
* The mesh line node with 4 million count was 1.5x (8ms to 12ms) faster.
* The Spring splash screen went from ~4.3 to ~4.5 fps.
* The subdivision surface modifier/node was slightly faster
RNA access through Python may be slightly slower, since now we need
a name lookup instead of just a custom data type lookup for each index.

**Future Improvements**
* Remove uses of "vert_coords" functions:
  * `BKE_mesh_vert_coords_alloc`
  * `BKE_mesh_vert_coords_get`
  * `BKE_mesh_vert_coords_apply{_with_mat4}`
* Remove more hidden copying of positions
* General simplification now possible in many areas
* Convert more code to C++ to use `float3` instead of `float[3]`
  * Currently `reinterpret_cast` is used for those C-API functions

Differential Revision: https://developer.blender.org/D15982
2023-01-10 00:10:43 -05:00