# Objective
- `collect_path` is only declared when feature `bevy_animation` is
enabled
- it is imported without checking for the feature, not compiling when
not enabled
## Solution
- Gate the import
# Objective
I was looking over a PR yesterday, and got confused by the docs on
deferred world. I thought I would add a little more detail to the struct
in order to clarify it a little.
## Solution
Document some more about deferred worlds.
# Objective
@cart noticed some issues with my work in
https://github.com/bevyengine/bevy/pull/17348#discussion_r2001815637,
which I somehow missed before merging the PR.
## Solution
- feature gate the UiPickingPlugin correctly
- don't manually add the picking plugins
## Testing
Ran the debug_picking and sprite_picking examples (for UI and sprites
respectively): both seem to work fine.
# Objective
The resources were converted via `clone_reflect_value` and the cloned
value was mapped. But the value that is inserted is the source of the
clone, which was not mapped.
I ran into this issue while working on #18380. Having non consecutive
entity allocations has caught a lot of bugs.
## Solution
Use the cloned value for insertion if it exists.
# Objective
- ECS error handling is a lovely flagship feature for Bevy 0.16, all in
the name of reducing panics and encouraging better error handling
(#14275).
- Currently though, command and system error handling are completely
disjoint and use different mechanisms.
- Additionally, there's a number of distinct ways to set the
default/fallback/global error handler that have limited value. As far as
I can tell, this will be cfg flagged to toggle between dev and
production builds in 99.9% of cases, with no real value in more granular
settings or helpers.
- Fixes#17272
## Solution
- Standardize error handling on the OnceLock global error mechanisms
ironed out in https://github.com/bevyengine/bevy/pull/17215
- As discussed there, there are serious performance concerns there,
especially for commands
- I also think this is a better fit for the use cases, as it's truly
global
- Move from `SystemErrorContext` to a more general purpose
`ErrorContext`, which can handle observers and commands more clearly
- Cut the superfluous setter methods on `App` and `SubApp`
- Rename the limited (and unhelpful) `fallible_systems` example to
`error_handling`, and add an example of command error handling
## Testing
Ran the `error_handling` example.
## Notes for reviewers
- Do you see a clear way to allow commands to retain &mut World access
in the per-command custom error handlers? IMO that's a key feature here
(allowing the ad-hoc creation of custom commands), but I'm not sure how
to get there without exploding complexity.
- I've removed the feature gate on the default_error_handler: contrary
to @cart's opinion in #17215 I think that virtually all apps will want
to use this. Can you think of a category of app that a) is extremely
performance sensitive b) is fine with shipping to production with the
panic error handler? If so, I can try to gather performance numbers
and/or reintroduce the feature flag. UPDATE: see benches at the end of
this message.
- ~~`OnceLock` is in `std`: @bushrat011899 what should we do here?~~
- Do you have ideas for more automated tests for this collection of
features?
## Benchmarks
I checked the impact of the feature flag introduced: benchmarks might
show regressions. This bears more investigation. I'm still skeptical
that there are users who are well-served by a fast always panicking
approach, but I'm going to re-add the feature flag here to avoid
stalling this out.
---------
Co-authored-by: Zachary Harrold <zac@harrold.com.au>
# Objective
Currently, our picking backends are inconsistent:
- Mesh picking and sprite picking both have configurable opt in/out
behavior. UI picking does not.
- Sprite picking uses `SpritePickingCamera` and `Pickable` for control,
but mesh picking uses `RayCastPickable`.
- `MeshPickingPlugin` is not a part of `DefaultPlugins`.
`SpritePickingPlugin` and `UiPickingPlugin` are.
## Solution
- Add configurable opt in/out behavior to UI picking (defaults to opt
out).
- Replace `RayCastPickable` with `MeshPickingCamera` and `Pickable`.
- Remove `SpritePickingPlugin` and `UiPickingPlugin` from
`DefaultPlugins`.
## Testing
Ran some examples.
## Migration Guide
`UiPickingPlugin` and `SpritePickingPlugin` are no longer included in
`DefaultPlugins`. They must be explicitly added.
`RayCastPickable` has been replaced in favor of the `MeshPickingCamera`
and `Pickable` components. You should add them to cameras and entities,
respectively, if you have `MeshPickingSettings::require_markers` set to
`true`.
---------
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
# Objective
Fixes https://github.com/bevyengine/bevy/issues/18366 which seems to
have a similar underlying cause than the already closed (but not fixed)
https://github.com/bevyengine/bevy/issues/16185.
## Solution
For Windows with the AMD vulkan driver, there was already a hack to
force serial command encoding, which prevented these issues. The Linux
version of the AMD vulkan driver seems to have similar issues than its
Windows counterpart, so I extended the hack to also cover AMD on Linux.
I also removed the mention of `wgpu` since it was already outdated, and
doesn't seem to be relevant to the core issue (the AMD driver being
buggy).
## Testing
- Did you test these changes? If so, how?
- I ran the `3d_scene` example, which on `main` produced the flickering
shadows on Linux with the amdvlk driver, while it no longer does with
the workaround applied.
- Are there any parts that need more testing?
- Not sure.
- How can other people (reviewers) test your changes? Is there anything
specific they need to know?
- Requires a Linux system with an AMD card and the AMDVLK driver.
- If relevant, what platforms did you test these changes on, and are
there any important ones you can't test?
- My change should only affect Linux, where I did test it.
# Objective
- #17219 introduced a circular dependency between bevy_image and
bevy_sprite for documentation
## Solution
- Remove the circular dependency
- Simplify the doc example
# Objective
Fixes#18357
## Solution
Generalize `RelationshipInsertHookMode` to `RelationshipHookMode`, wire
it up to on_replace execution, and use it in the
`Relationship::on_replace` hook.
# Objective
- Some examples are now build as lib to be usable in other examples
since https://github.com/bevyengine/bevy/pull/18288
- Those examples are not correctly handled in the showcase as it tries
to run them
## Solution
- Ignore lib examples in showcase when taking screenshots or building
for the website
# Objective
- https://github.com/bevyengine/bevy/pull/17887 introduced a circular
dependency between bevy_image and bevy_core_pipeline
- This makes it impossible to publish Bevy
## Solution
- Remove the circular dependency, reintroduce the compilation failure
- This failure shouldn't be an issue for users of Bevy, only for users
of subcrates, and can be workaround
- Proper fix should be done with
https://github.com/bevyengine/bevy/issues/17891
- Limited compilation failure is better than publish failure
# Objective
Extract sprites into a `Vec` instead of a `HashMap`.
## Solution
Extract UI nodes into a `Vec` instead of an `EntityHashMap`.
Add an index into the `Vec` to `Transparent2d`.
Compare both the index and render entity in prepare so there aren't any
collisions.
## Showcase
yellow this PR, red main
```
cargo run --example many_sprites --release --features "trace_tracy"
```
`extract_sprites`
<img width="452" alt="extract_sprites"
src="https://github.com/user-attachments/assets/66c60406-7c2b-4367-907d-4a71d3630296"
/>
`queue_sprites`
<img width="463" alt="queue_sprites"
src="https://github.com/user-attachments/assets/54b903bd-4137-4772-9f87-e10e1e050d69"
/>
---------
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
# Objective
- Fixes#17506
- Fixes#16258
## Solution
- Added a new folder of examples, `no_std`, similar to the `mobile`
folder.
- Added a single example, `no_std_library`, which demonstrates how to
make a `no_std` compatible Bevy library.
- Added a new CI task, `check-compiles-no-std-examples`, which checks
that `no_std` examples compile on `no_std` targets.
- Added `bevy_platform_support::prelude` to `bevy::prelude`.
## Testing
- CI
---
## Notes
- I've structured the folders here to permit further `no_std` examples
(e.g., GameBoy Games, ESP32 firmware, etc.), but I am starting with the
simplest and least controversial example.
- I've tried to be as clear as possible with the documentation for this
example, catering to an audience who may not have even heard of `no_std`
before.
---------
Co-authored-by: Greeble <166992735+greeble-dev@users.noreply.github.com>
# Objective
I experienced an issue where `HashMap::new` was not returning a value
typed appropriately for a `HashMap<K,V>` declaration that omitted the
Hasher- e.g. the Default Hasher for the type is different than what the
`new` method produces.
After discussion on discord, this appears to be an issue in `hashbrown`,
and working around it would be very nontrivial, requiring a newtype on
top of the `hashbrown` implementation. Rather than doing that, it was
suggested that we add docs to make the issue more visible and provide a
clear workaround.
## Solution
Updated the docs for `bevy_platform_support::collections`. I couldn't
update Struct docs because they're re-exports, so I had to settle for
the module.
Note that the `[HashMap::new]` link wasn't generating properly- I'm not
sure why. I see the method in the docs.rs site,
https://docs.rs/hashbrown/0.15.1/hashbrown/struct.HashMap.html#method.new,
but not on the generated internal documentation. I wonder if `hashbrown`
isn't actually implementing the new or something?
## Testing
n/a although I did generate and open the docs on my Ubuntu machine.
---
## Showcase
before:
after:
---------
Co-authored-by: Zachary Harrold <zac@harrold.com.au>
# Objective
WESL was broken on windows.
## Solution
- Upgrade to `wesl_rs` 1.2.
- Fix path handling on windows.
- Improve example for khronos demo this week.
# Objective
- #17581 broke gizmos
- Fixes#18325
## Solution
- Revert #17581
- Add gizmos to testbed
## Testing
- Run any example with gizmos, it renders correctly
# Objective
On iOS:
- Allow `std` to do its runtime initialization.
- Avoid requiring the user to specify linked libraries and framework in
Xcode.
- Reduce the amount of work that `#[bevy_main]` does
- In the future we may also be able to eliminate the need for it on
Android, cc @daxpedda.
## Solution
We previously:
- Exposed an `extern "C" fn main_rs` entry point.
- Ran Cargo in a separate Xcode target as an external build system.
- Imported that as a dependency of `bevy_mobile_example.app`.
- Compiled a trampoline C file with Xcode that called `main_rs`.
- Linked that via. Xcode.
All of this is unnecessary; `rustc` is well capable of creating iOS
executables, the trick is just to place it at the correct location for
Xcode to understand it, namely `$TARGET_BUILD_DIR/$EXECUTABLE_PATH`
(places it in `bevy_mobile_example.app/bevy_mobile_example`).
Note: We might want to wait with the changes to `#[bevy_main]` until the
problem is resolved on Android too, to make the migration easier.
## Testing
Open the Xcode project, and build for an iOS target.
---
## Migration Guide
**If you have been building your application for iOS:**
Previously, the `#[bevy_main]` attribute created a `main_rs` entry point
that most Xcode templates were using to run your Rust code from C. This
was found to be unnecessary, as you can simply let Rust build your
application as a binary, and run that directly.
You have two options for dealing with this:
If you've added further C code and Xcode customizations, or it makes
sense for your use-case to continue link with Xcode, you can revert to
the old behaviour by adding `#[no_mangle] extern "C" main_rs() { main()
}` to your `main.rs`. Note that the old approach of linking a static
library prevents the Rust standard library from doing runtime
initialization, so certain functionality provided by `std` might be
unavailable (stack overflow handlers, stdout/stderr flushing and other
such functionality provided by the initialization routines).
The other, preferred option is to remove your "compile" and "link" build
phases, and instead replace it with a "run script" phase that invokes
`cargo build --bin ...`, and moves the built binary to the Xcode path
`$TARGET_BUILD_DIR/$EXECUTABLE_PATH`. An example of how to do this can
be viewed at [INSERT LINK TO UPDATED EXAMPLE PROJECT].
To make the debugging experience in Xcode nicer after this, you might
also want to consider either enabling `panic = "abort"` or to set a
breakpoint on the `rust_panic` symbol.
---------
Co-authored-by: François Mockers <mockersf@gmail.com>
Co-authored-by: François Mockers <francois.mockers@vleue.com>
# Objective
As pointed out by @cart on
[Discord](https://discord.com/channels/691052431525675048/1002362493634629796/1351279139872571462),
we should be careful when using tuple shorthand to register types. Doing
so incurs some unnecessary penalties such as memory/compile/performance
cost to generate registrations for a tuple type that will never be used.
A better solution would be to create a custom lint for this, but for now
we can at least remove the existing usages of this pattern.
> [!note]
> This pattern of using tuples to register multiple types at once isn't
inherently bad. Users should feel free to use this pattern, knowing the
side effects it may have. What this problem really is about is using
this in _library_ code, where users of Bevy have no choice in whether a
tuple is unnecessarily registered in an internal plugin or not.
## Solution
Replace tuple registrations with single-type registrations.
Note that I left the tuple registrations in test code since I feel like
brevity is more important in those cases. But let me know if I should
change them or leave a comment above them!
## Testing
You can test locally by running:
```
cargo check --workspace --all-features
```
# Objective
FilteredResource::get should return a Result instead of Option
Fixes#17480
---
## Migration Guide
Users will need to handle the different return type on
FilteredResource::get, FilteredResource::get_id,
FilteredResource::get_mut as it is now a Result not an Option.
# Objective
Continuation of #17449.
#17449 implemented the wrapper types around `IndexMap`/`Set` and co.,
however punted on the slice types.
They are needed to support creating `EntitySetIterator`s from their
slices, not just the base maps and sets.
## Solution
Add the wrappers, in the same vein as #17449 and #17589 before.
The `Index`/`IndexMut` implementations take up a lot of space, however
they cannot be merged because we'd then get overlaps.
They are simply named `Slice` to match the `indexmap` naming scheme, but
this means they cannot be differentiated properly until their modules
are made public, which is already a follow-up mentioned in #17954.
# Objective
Now that #13432 has been merged, it's important we update our reflected
types to properly opt into this feature. If we do not, then this could
cause issues for users downstream who want to make use of
reflection-based cloning.
## Solution
This PR is broken into 4 commits:
1. Add `#[reflect(Clone)]` on all types marked `#[reflect(opaque)]` that
are also `Clone`. This is mandatory as these types would otherwise cause
the cloning operation to fail for any type that contains it at any
depth.
2. Update the reflection example to suggest adding `#[reflect(Clone)]`
on opaque types.
3. Add `#[reflect(clone)]` attributes on all fields marked
`#[reflect(ignore)]` that are also `Clone`. This prevents the ignored
field from causing the cloning operation to fail.
Note that some of the types that contain these fields are also `Clone`,
and thus can be marked `#[reflect(Clone)]`. This makes the
`#[reflect(clone)]` attribute redundant. However, I think it's safer to
keep it marked in the case that the `Clone` impl/derive is ever removed.
I'm open to removing them, though, if people disagree.
4. Finally, I added `#[reflect(Clone)]` on all types that are also
`Clone`. While not strictly necessary, it enables us to reduce the
generated output since we can just call `Clone::clone` directly instead
of calling `PartialReflect::reflect_clone` on each variant/field. It
also means we benefit from any optimizations or customizations made in
the `Clone` impl, including directly dereferencing `Copy` values and
increasing reference counters.
Along with that change I also took the liberty of adding any missing
registrations that I saw could be applied to the type as well, such as
`Default`, `PartialEq`, and `Hash`. There were hundreds of these to
edit, though, so it's possible I missed quite a few.
That last commit is **_massive_**. There were nearly 700 types to
update. So it's recommended to review the first three before moving onto
that last one.
Additionally, I can break the last commit off into its own PR or into
smaller PRs, but I figured this would be the easiest way of doing it
(and in a timely manner since I unfortunately don't have as much time as
I used to for code contributions).
## Testing
You can test locally with a `cargo check`:
```
cargo check --workspace --all-features
```
# Objective
Add a `UiRect::AUTO` const which is a `UiRect` with all its edge values
set to `Val::Auto`.
IIRC `UiRect`'s default for its fields a few versions ago was
`Val::Auto` because positions were represented using a `UiRect` and they
required `Val::Auto` as a default. Then when position was split up and
the `UiRect` default was changed, we forgot add a `UiRect::AUTO` const.
Extracted from my DLSS branch.
## Changelog
* Added `source_texture` and `destination_texture` to
`PostProcessWrite`, in addition to the existing texture views.
obtaining a reference to an empty enum is not possible in Rust, so I
just replaced any match on self with an `unreachable!()`
I checked if an enum is empty by checking if the `variant_patterns` vec
of the `EnumVariantOutputData` struct is empty
Fixes#18277
## Testing
I added one new unit test.
``` rust
#[test]
fn should_allow_empty_enums() {
#[derive(Reflect)]
enum Empty {}
assert_impl_all!(Empty: Reflect);
}
```
# Objective
In its existing form, the clamping that's done in `camera_system`
doesn't work well when the `physical_position` of the associated
viewport is nonzero. In such cases, it may produce invalid viewport
rectangles (i.e. not lying inside the render target), which may result
in crashes during the render pass.
The goal of this PR is to eliminate this possibility by making the
clamping behavior always result in a valid viewport rectangle when
possible.
## Solution
Incorporate the `physical_position` information into the clamping
behavior. In particular, always cut off enough so that it's contained in
the render target rather than clamping it to the same dimensions as the
target itself. In weirder situations, still try to produce a valid
viewport rectangle to avoid crashes.
## Testing
Tested these changes on my work branch where I encountered the crash.
# Objective
Currently experimenting with manually implementing
`Relationship`/`RelationshipTarget` to support associated edge data,
which means I need to replace the default hook implementations provided
by those traits. However, copying them over for editing revealed that
`UnsafeWorldCell::get_raw_command_queue` is `pub(crate)`, and I would
like to not have to clone the source collection, like the default impl.
So instead, I've taken to providing a safe abstraction for being able to
access entities and queue commands simultaneously.
## Solution
Added `World::entities_and_commands` and
`DeferredWorld::entities_and_commands`, which can be used like so:
```rust
let eid: Entity = /* ... */;
let (mut fetcher, mut commands) = world.entities_and_commands();
let emut = fetcher.get_mut(eid).unwrap();
commands.entity(eid).despawn();
```
## Testing
- Added a new test for each of the added functions.
---------
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
Bumps [crate-ci/typos](https://github.com/crate-ci/typos) from 1.30.1 to
1.30.2.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/crate-ci/typos/releases">crate-ci/typos's
releases</a>.</em></p>
<blockquote>
<h2>v1.30.2</h2>
<h2>[1.30.2] - 2025-03-10</h2>
<h3>Features</h3>
<ul>
<li>Add <code>--highlight-words</code> and
<code>--highlight-identifiers</code> for easier debugging of config</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/crate-ci/typos/blob/master/CHANGELOG.md">crate-ci/typos's
changelog</a>.</em></p>
<blockquote>
<h2>[1.30.2] - 2025-03-10</h2>
<h3>Features</h3>
<ul>
<li>Add <code>--highlight-words</code> and
<code>--highlight-identifiers</code> for easier debugging of config</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="7bc041cbb7"><code>7bc041c</code></a>
chore: Release</li>
<li><a
href="4af8a5a1fb"><code>4af8a5a</code></a>
docs: Update changelog</li>
<li><a
href="ec626a1e53"><code>ec626a1</code></a>
Merge pull request <a
href="https://redirect.github.com/crate-ci/typos/issues/1257">#1257</a>
from epage/highlight</li>
<li><a
href="d06a1dd728"><code>d06a1dd</code></a>
feat(cli): Add '--highlight-<identifiers|words>' flags</li>
<li>See full diff in <a
href="https://github.com/crate-ci/typos/compare/v1.30.1...v1.30.2">compare
view</a></li>
</ul>
</details>
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# Objective
Continuation to #16547 and #17954.
The `get_many` family are the last methods on `Query`/`QueryState` for
which we're still missing a `unique` version.
## Solution
Offer `get_many_unique`/`get_many_unique_mut` and
`get_many_unique_inner`!
Their implementation is the same as `get_many`, the difference lies in
their guaranteed-to-be unique inputs, meaning we never do any aliasing
checks.
To reduce confusion, we also rename `get_many_readonly` into
`get_many_inner` and the current `get_many_inner` into
`get_many_mut_inner` to clarify their purposes.
## Testing
Doc examples.
## Migration Guide
`get_many_inner` is now called `get_many_mut_inner`.
`get_many_readonly` is now called `get_many_inner`.
# Objective
- Fixes#18342.
## Solution
- Canonicalize the root path so that when we try to strip the prefix, it
matches the canonicalized asset path.
- This is basically just a followup to #18023.
## Testing
- Ran the hot_asset_reloading example and it no longer panics.
# Objective
The `ViewportConversionError` error type does not implement `Error`,
making it incompatible with `BevyError`.
## Solution
Derive `Error` for `ViewportConversionError`.
I chose to use `thiserror` since it's already a dependency, but do let
me know if we should be preferring `derive_more`.
## Testing
You can test this by trying to compile the following:
```rust
let error: BevyError = ViewportConversionError::InvalidData.into();
```
Registering dynamic bundles was not possible for the user yet.
It is alone not very useful though as there are no methods to clone,
move or remove components via a `BundleId`. This could be a follow-up
work if this PR is approved and such a third (besides `T: Bundle` and
`ComponentId`(s)) API for structural operation is desired. I certainly
would use a hypothetical `EntityClonerBuilder::allow_by_bundle_id`.
I personally still would like this register method because I have a
`Bundles`-like custom data structure and I would like to not reinvent
the wheel. Then instead of having boxed `ComponentId` slices in my
collection I could look up explicit and required components there.
For reference scroll up to the typed version right above the new one.
# Objective
I was setting up an asset loader that passes settings through to
`ImageLoader`, and i have to clone the settings to achieve this.
## Solution
Derive `Clone` for `ImageLoaderSettings` and `ImageFormatSetting`.
## Testing
Full CI passed.
I mistakenly thought that with the wgpu upgrade we'd have
`PARTIALLY_BOUND_BINDING_ARRAY` everywhere. Unfortunately this is not
the case. This PR adds a workaround back in.
Closes#18098.
Fix https://github.com/bevyengine/bevy/issues/17763.
Attachment info needs to be created outside of the command encoding
task, as it needs to be part of the serial node runners in order to get
the ordering correct.
Less data accessed and compared gives better batching performance.
# Objective
- Use a smaller id to represent the lightmap in batch data to enable a
faster implementation of draw streams.
- Improve batching performance for 3D sorted render phases.
## Solution
- 3D batching can use `LightmapSlabIndex` (a `NonMaxU32` which is 4
bytes) instead of the lightmap `AssetId<Image>` (an enum where the
largest variant is a 16-byte UUID) to discern the ability to batch.
## Testing
Tested main (yellow) vs this PR (red) on an M4 Max using the
`many_cubes` example with `WGPU_SETTINGS_PRIO=webgl2` to avoid
GPU-preprocessing, and modifying the materials in `many_cubes` to have
`AlphaMode::Blend` so that they would rely on the less efficient sorted
render phase batching.
<img width="1500" alt="Screenshot_2025-03-15_at_12 17 21"
src="https://github.com/user-attachments/assets/14709bd3-6d06-40fb-aa51-e1d2d606ebe3"
/>
A 44.75us or 7.5% reduction in median execution time of the batch and
prepare sorted render phase system for the `Transparent3d` phase
(handling 160k cubes).
---
## Migration Guide
- Changed: `RenderLightmap::new()` no longer takes an `AssetId<Image>`
argument for the asset id of the lightmap image.
# Objective
Installment of the #16547 series.
The vast majority of uses for these types will be the `Entity` case, so
it makes sense for it to be the default.
## Solution
`UniqueEntityVec`, `UniqueEntitySlice`, `UniqueEntityArray` and their
helper iterator aliases now have `Entity` as a default.
Unfortunately, this means the the `T` parameter for `UniqueEntityArray`
now has to be ordered after the `N` constant, which breaks the
consistency to `[T; N]`.
Same with about a dozen iterator aliases that take some `P`/`F`
predicate/function parameter.
This should however be an ergonomic improvement in most cases, so we'll
just have to live with this inconsistency.
## Migration Guide
Switch type parameter order for the relevant wrapper types/aliases.
# Objective
#13432 added proper reflection-based cloning. This is a better method
than cloning via `clone_value` for reasons detailed in the description
of that PR. However, it may not be immediately apparent to users why one
should be used over the other, and what the gotchas of `clone_value`
are.
## Solution
This PR marks `PartialReflect::clone_value` as deprecated, with the
deprecation notice pointing users to `PartialReflect::reflect_clone`.
However, it also suggests using a new method introduced in this PR:
`PartialReflect::to_dynamic`.
`PartialReflect::to_dynamic` is essentially a renaming of
`PartialReflect::clone_value`. By naming it `to_dynamic`, we make it
very obvious that what's returned is a dynamic type. The one caveat to
this is that opaque types still use `reflect_clone` as they have no
corresponding dynamic type.
Along with changing the name, the method is now optional, and comes with
a default implementation that calls out to the respective reflection
subtrait method. This was done because there was really no reason to
require manual implementors provide a method that almost always calls
out to a known set of methods.
Lastly, to make this default implementation work, this PR also did a
similar thing with the `clone_dynamic ` methods on the reflection
subtraits. For example, `Struct::clone_dynamic` has been marked
deprecated and is superseded by `Struct::to_dynamic_struct`. This was
necessary to avoid the "multiple names in scope" issue.
### Open Questions
This PR maintains the original signature of `clone_value` on
`to_dynamic`. That is, it takes `&self` and returns `Box<dyn
PartialReflect>`.
However, in order for this to work, it introduces a panic if the value
is opaque and doesn't override the default `reflect_clone`
implementation.
One thing we could do to avoid the panic would be to make the conversion
fallible, either returning `Option<Box<dyn PartialReflect>>` or
`Result<Box<dyn PartialReflect>, ReflectCloneError>`.
This makes using the method a little more involved (i.e. users have to
either unwrap or handle the rare possibility of an error), but it would
set us up for a world where opaque types don't strictly need to be
`Clone`. Right now this bound is sort of implied by the fact that
`clone_value` is a required trait method, and the default behavior of
the macro is to use `Clone` for opaque types.
Alternatively, we could keep the signature but make the method required.
This maintains that implied bound where manual implementors must provide
some way of cloning the value (or YOLO it and just panic), but also
makes the API simpler to use.
Finally, we could just leave it with the panic. It's unlikely this would
occur in practice since our macro still requires `Clone` for opaque
types, and thus this would only ever be an issue if someone were to
manually implement `PartialReflect` without a valid `to_dynamic` or
`reflect_clone` method.
## Testing
You can test locally using the following command:
```
cargo test --package bevy_reflect --all-features
```
---
## Migration Guide
`PartialReflect::clone_value` is being deprecated. Instead, use
`PartialReflect::to_dynamic` if wanting to create a new dynamic instance
of the reflected value. Alternatively, use
`PartialReflect::reflect_clone` to attempt to create a true clone of the
underlying value.
Similarly, the following methods have been deprecated and should be
replaced with these alternatives:
- `Array::clone_dynamic` → `Array::to_dynamic_array`
- `Enum::clone_dynamic` → `Enum::to_dynamic_enum`
- `List::clone_dynamic` → `List::to_dynamic_list`
- `Map::clone_dynamic` → `Map::to_dynamic_map`
- `Set::clone_dynamic` → `Set::to_dynamic_set`
- `Struct::clone_dynamic` → `Struct::to_dynamic_struct`
- `Tuple::clone_dynamic` → `Tuple::to_dynamic_tuple`
- `TupleStruct::clone_dynamic` → `TupleStruct::to_dynamic_tuple_struct`
