247 commits

Author	SHA1	Message	Date
Gino Valente	60773e6787	bevy_reflect: Fix ignored/skipped field order (#7575) ... # Objective Fixes #5101 Alternative to #6511 ## Solution Corrected the behavior for ignored fields in `FromReflect`, which was previously using the incorrect field indexes. Similarly, fields marked with `#[reflect(skip_serializing)]` no longer break when using `FromReflect` after deserialization. This was done by modifying `SerializationData` to store a function pointer that can later be used to generate a default instance of the skipped field during deserialization. The function pointer points to a function generated by the derive macro using the behavior designated by `#[reflect(default)]` (or just `Default` if none provided). The entire output of the macro is now wrapped in an [unnamed constant](https://doc.rust-lang.org/stable/reference/items/constant-items.html#unnamed-constant) which keeps this behavior hygienic. #### Rationale The biggest downside to this approach is that it requires fields marked `#[reflect(skip_serializing)]` to provide the ability to create a default instance— either via a `Default` impl or by specifying a custom one. While this isn't great, I think it might be justified by the fact that we really need to create this value when using `FromReflect` on a deserialized object. And we need to do this _during_ deserialization because after that (at least for tuples and tuple structs) we lose information about which field is which: _"is the value at index 1 in this `DynamicTupleStruct` the actual value for index 1 or is it really the value for index 2 since index 1 is skippable...?"_ #### Alternatives An alternative would be to store `Option<Box<dyn Reflect>>` within `DynamicTuple` and `DynamicTupleStruct` instead of just `Box<dyn Reflect>`. This would allow us to insert "empty"/"missing" fields during deserialization, thus saving the positional information of the skipped fields. However, this may require changing the API of `Tuple` and `TupleStruct` such that they can account for their dynamic counterparts returning `None` for a skipped field. In practice this would probably mean exposing the `Option`-ness of the dynamics onto implementors via methods like `Tuple::drain` or `TupleStruct::field`. Personally, I think requiring `Default` would be better than muddying up the API to account for these special cases. But I'm open to trying out this other approach if the community feels that it's better. --- ## Changelog ### Public Changes #### Fixed - The behaviors of `#[reflect(ignore)]` and `#[reflect(skip_serializing)]` are no longer dependent on field order #### Changed - Fields marked with `#[reflect(skip_serializing)]` now need to either implement `Default` or specify a custom default function using `#[reflect(default = "path::to::some_func")]` - Deserializing a type with fields marked `#[reflect(skip_serializing)]` will now include that field initialized to its specified default value - `SerializationData::new` now takes the new `SkippedField` struct along with the skipped field index - Renamed `SerializationData::is_ignored_field` to `SerializationData::is_field_skipped` #### Added - Added `SkippedField` struct - Added methods `SerializationData::generate_default` and `SerializationData::iter_skipped` ### Internal Changes #### Changed - Replaced `members_to_serialization_denylist` and `BitSet<u32>` with `SerializationDataDef` - The `Reflect` derive is more hygienic as it now outputs within an [unnamed constant](https://doc.rust-lang.org/stable/reference/items/constant-items.html#unnamed-constant) - `StructField::index` has been split up into `StructField::declaration_index` and `StructField::reflection_index` #### Removed - Removed `bitset` dependency ## Migration Guide * Fields marked `#[reflect(skip_serializing)]` now must implement `Default` or specify a custom default function with `#[reflect(default = "path::to::some_func")]` ```rust #[derive(Reflect)] struct MyStruct { #[reflect(skip_serializing)] #[reflect(default = "get_foo_default")] foo: Foo, // <- `Foo` does not impl `Default` so requires a custom function #[reflect(skip_serializing)] bar: Bar, // <- `Bar` impls `Default` } #[derive(Reflect)] struct Foo(i32); #[derive(Reflect, Default)] struct Bar(i32); fn get_foo_default() -> Foo { Foo(123) } ``` * `SerializationData::new` has been changed to expect an iterator of `(usize, SkippedField)` rather than one of just `usize` ```rust // BEFORE SerializationData::new([0, 3].into_iter()); // AFTER SerializationData::new([ (0, SkippedField::new(field_0_default_fn)), (3, SkippedField::new(field_3_default_fn)), ].into_iter()); ``` * `Serialization::is_ignored_field` has been renamed to `Serialization::is_field_skipped` * Fields marked `#[reflect(skip_serializing)]` are now included in deserialization output. This may affect logic that expected those fields to be absent.	2023-10-22 12:43:31 +00:00
Gino Valente	01b910a148	bevy_reflect: Fix dynamic type serialization (#10103) ... # Objective Fixes #10086 ## Solution Instead of serializing via `DynamicTypePath::reflect_type_path`, now uses the `TypePath` found on the `TypeInfo` returned by `Reflect::get_represented_type_info`. This issue was happening because the dynamic types implement `TypePath` themselves and do not (and cannot) forward their proxy's `TypePath` data. The solution was to access the proxy's type information in order to get the correct `TypePath` data. ## Changed - The `Debug` impl for `TypePathTable` now includes output for all fields.	2023-10-16 23:31:16 +00:00
Ame :]	b9ddb37d5b	add and fix shields in Readmes (#9993) ... # Objective Fix shields ## Solution - Correct shield in the Bevy ECS Readme, where only the MIT license is displayed  - Add shields to other Readmes. - homogenize shields and titles.	2023-10-15 00:52:31 +00:00
Zachary Harrold	bb13d065d3	Removed once_cell (#10079) ... # Objective - Fixes #8303 ## Solution - Replaced 1 instance of `OnceBox<T>` with `OnceLock<T>` in `NonGenericTypeCell` ## Notes All changes are in the private side of Bevy, and appear to have no observable change in performance or compilation time. This is purely to reduce the quantity of direct dependencies in Bevy.	2023-10-12 10:20:07 +00:00
Trashtalk217	e5f5ce5e97	Migrate Quat reflection strategy from "value" to "struct" (#10068) ... Adopted from #8954, co-authored by @pyrotechnick # Objective The Bevy ecosystem currently reflects `Quat` via "value" rather than the more appropriate "struct" strategy. This behaviour is inconsistent to that of similar types, i.e. `Vec3`. Additionally, employing the "value" strategy causes instances of `Quat` to be serialised as a sequence `[x, y, z, w]` rather than structures of shape `{ x, y, z, w }`. The [comments surrounding the applicable code](bec299fa6e/crates/bevy_reflect/src/impls/glam.rs (L254)) give context and historical reasons for this discrepancy: ``` // Quat fields are read-only (as of now), and reflection is currently missing // mechanisms for read-only fields. I doubt those mechanisms would be added, // so for now quaternions will remain as values. They are represented identically // to Vec4 and DVec4, so you may use those instead and convert between. ``` This limitation has [since been lifted by the upstream crate](374625163e), glam. ## Solution Migrating the reflect strategy of Quat from "value" to "struct" via replacing `impl_reflect_value` with `impl_reflect_struct` resolves the issue. ## Changelog Migrated `Quat` reflection strategy to "struct" from "value" Migration Guide Changed Quat serialization/deserialization from sequences `[x, y, z, w]` to structures `{ x, y, z, w }`. --------- Co-authored-by: pyrotechnick <13998+pyrotechnick@users.noreply.github.com> Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>	2023-10-09 22:01:42 +00:00
radiish	262846e702	reflect: TypePath part 2 (#8768) ... # Objective - Followup to #7184. - ~Deprecate `TypeUuid` and remove its internal references.~ No longer part of this PR. - Use `TypePath` for the type registry, and (de)serialisation instead of `std::any::type_name`. - Allow accessing type path information behind proxies. ## Solution - Introduce methods on `TypeInfo` and friends for dynamically querying type path. These methods supersede the old `type_name` methods. - Remove `Reflect::type_name` in favor of `DynamicTypePath::type_path` and `TypeInfo::type_path_table`. - Switch all uses of `std::any::type_name` in reflection, non-debugging contexts to use `TypePath`. --- ## Changelog - Added `TypePathTable` for dynamically accessing methods on `TypePath` through `TypeInfo` and the type registry. - Removed `type_name` from all `TypeInfo`-like structs. - Added `type_path` and `type_path_table` methods to all `TypeInfo`-like structs. - Removed `Reflect::type_name` in favor of `DynamicTypePath::reflect_type_path` and `TypeInfo::type_path`. - Changed the signature of all `DynamicTypePath` methods to return strings with a static lifetime. ## Migration Guide - Rely on `TypePath` instead of `std::any::type_name` for all stability guarantees and for use in all reflection contexts, this is used through with one of the following APIs: - `TypePath::type_path` if you have a concrete type and not a value. - `DynamicTypePath::reflect_type_path` if you have an `dyn Reflect` value without a concrete type. - `TypeInfo::type_path` for use through the registry or if you want to work with the represented type of a `DynamicFoo`. - Remove `type_name` from manual `Reflect` implementations. - Use `type_path` and `type_path_table` in place of `type_name` on `TypeInfo`-like structs. - Use `get_with_type_path(_mut)` over `get_with_type_name(_mut)`. ## Note to reviewers I think if anything we were a little overzealous in merging #7184 and we should take that extra care here. In my mind, this is the "point of no return" for `TypePath` and while I think we all agree on the design, we should carefully consider if the finer details and current implementations are actually how we want them moving forward. For example [this incorrect `TypePath` implementation for `String`](3fea3c6c0b/crates/bevy_reflect/src/impls/std.rs (L90)) (note that `String` is in the default Rust prelude) snuck in completely under the radar.	2023-10-09 19:33:03 +00:00
Mike	687e379800	Updates for rust 1.73 (#10035) ... # Objective - Updates for rust 1.73 ## Solution - new doc check for `redundant_explicit_links` - updated to text for compile fail tests --- ## Changelog - updates for rust 1.73	2023-10-06 00:31:10 +00:00
Zachary Harrold	450328d15e	Replaced parking_lot with std::sync (#9545) ... # Objective - Fixes #4610 ## Solution - Replaced all instances of `parking_lot` locks with equivalents from `std::sync`. Acquiring locks within `std::sync` can fail, so `.expect("Lock Poisoned")` statements were added where required. ## Comments In [this comment](https://github.com/bevyengine/bevy/issues/4610#issuecomment-1592407881), the lack of deadlock detection was mentioned as a potential reason to not make this change. From what I can gather, Bevy doesn't appear to be using this functionality within the engine. Unless it was expected that a Bevy consumer was expected to enable and use this functionality, it appears to be a feature lost without consequence. Unfortunately, `cpal` and `wgpu` both still rely on `parking_lot`, leaving it in the dependency graph even after this change. From my basic experimentation, this change doesn't appear to have any performance impacts, positive or negative. I tested this using `bevymark` with 50,000 entities and observed 20ms of frame-time before and after the change. More extensive testing with larger/real projects should probably be done.	2023-10-02 12:44:34 +00:00
Tristan Guichaoua	44c769f7b9	Improve TypeUuid's derive macro error messages (#9315) ... # Objective - Better error message - More idiomatic code ## Solution Refactorize `TypeUuid` macros to use `syn::Result` instead of panic. ## Before/After error messages ### Missing `#[uuid]` attribtue #### Before ``` error: proc-macro derive panicked --> src\main.rs:1:10 | 1 | #[derive(TypeUuid)] | ^^^^^^^^ | = help: message: No `#[uuid = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"` attribute found. ``` #### After ``` error: No `#[uuid = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"]` attribute found. --> src\main.rs:3:10 | 3 | #[derive(TypeUuid)] | ^^^^^^^^ | = note: this error originates in the derive macro `TypeUuid` (in Nightly builds, run with -Z macro-backtrace for more info) ``` ### Malformed attribute #### Before ``` error: proc-macro derive panicked --> src\main.rs:3:10 | 3 | #[derive(TypeUuid)] | ^^^^^^^^ | = help: message: `uuid` attribute must take the form `#[uuid = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"`. ``` #### After ``` error: `uuid` attribute must take the form `#[uuid = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"]`. --> src\main.rs:4:1 | 4 | #[uuid = 42] | ^^^^^^^^^^^^ ``` ### UUID parse fail #### Before ``` error: proc-macro derive panicked --> src\main.rs:3:10 | 3 | #[derive(TypeUuid)] | ^^^^^^^^ | = help: message: Value specified to `#[uuid]` attribute is not a valid UUID.: Error(SimpleLength { len: 3 }) ``` #### After ``` error: Invalid UUID: invalid length: expected length 32 for simple format, found 3 --> src\main.rs:4:10 | 4 | #[uuid = "000"] | ^^^^^ ``` ### With [Error Lens](https://marketplace.visualstudio.com/items?itemName=usernamehw.errorlens) #### Before  #### After  --- ## Changelog - `#[derive(TypeUuid)]` provide better error messages.	2023-10-02 12:42:01 +00:00
Zachary Harrold	e5dbde86fb	Moved fq_std from bevy_reflect_derive to bevy_macro_utils (#9956) ... # Objective - Fixes #9363 ## Solution Moved `fq_std` from `bevy_reflect_derive` to `bevy_macro_utils`. This does make the `FQ*` types public where they were previously private, which is a change to the public-facing API, but I don't believe a breaking one. Additionally, I've done a basic QA pass over the `bevy_macro_utils` crate, adding `deny(unsafe)`, `warn(missing_docs)`, and documentation where required.	2023-10-02 00:22:57 +00:00
Christian Hughes	f8fd93f418	Add TypePath to the prelude (#9963) ... # Objective In order to derive `Asset`s (v2), `TypePath` must also be implemented. `TypePath` is not currently in the prelude, but given it is *required* when deriving something that *is* in the prelude, I think it deserves to be added. ## Solution Add `TypePath` to `bevy_reflect::prelude`.	2023-09-29 08:27:30 +00:00
Rob Parrett	7063c86ed4	Fix some typos (#9934) ... # Objective To celebrate the turning of the seasons, I took a small walk through the codebase guided by the "[code spell checker](https://marketplace.visualstudio.com/items?itemName=streetsidesoftware.code-spell-checker)" VS Code extension and fixed a few typos.	2023-09-26 19:46:24 +00:00
Joseph	d5d355ae1f	Fix the clippy::explicit_iter_loop lint (#9834) ... # Objective Replace instances of ```rust for x in collection.iter{_mut}() { ``` with ```rust for x in &{mut} collection { ``` This also changes CI to no longer suppress this lint. Note that since this lint only shows up when using clippy in pedantic mode, it was probably unnecessary to suppress this lint in the first place.	2023-09-19 03:35:22 +00:00
Nicola Papale	0bd4ea7ced	Provide getters for fields of ReflectFromPtr (#9748) ... # Objective The reasoning is similar to #8687. I'm building a dynamic query. Currently, I store the ReflectFromPtr in my dynamic `Fetch` type. [See relevant code](97ba68ae1e/src/fetches.rs (L14-L17)) However, `ReflectFromPtr` is: - 16 bytes for TypeId - 8 bytes for the non-mutable function pointer - 8 bytes for the mutable function pointer It's a lot, it adds 32 bytes to my base `Fetch` which is only `ComponendId` (8 bytes) for a total of 40 bytes. I only need one function per fetch, reducing the total dynamic fetch size to 16 bytes. Since I'm querying the components by the ComponendId associated with the function pointer I'm using, I don't need the TypeId, it's a redundant check. In fact, I've difficulties coming up with situations where checking the TypeId beforehand is relevant. So to me, if ReflectFromPtr makes sense as a public API, exposing the function pointers also makes sense. ## Solution - Make the fields public through methods. --- ## Changelog - Add `from_ptr` and `from_ptr_mut` methods to `ReflectFromPtr` to access the underlying function pointers - `ReflectFromPtr::as_reflect_ptr` is now `ReflectFromPtr::as_reflect` - `ReflectFromPtr::as_reflect_ptr_mut` is now `ReflectFromPtr::as_reflect_mut` ## Migration guide - `ReflectFromPtr::as_reflect_ptr` is now `ReflectFromPtr::as_reflect` - `ReflectFromPtr::as_reflect_ptr_mut` is now `ReflectFromPtr::as_reflect_mut`	2023-09-18 13:41:51 +00:00
Joseph	8eb6ccdd87	Remove useless single tuples and trailing commas (#9720) ... # Objective Title	2023-09-08 21:46:54 +00:00
Carter Anderson	5eb292dc10	Bevy Asset V2 (#8624) ... # Bevy Asset V2 Proposal ## Why Does Bevy Need A New Asset System? Asset pipelines are a central part of the gamedev process. Bevy's current asset system is missing a number of features that make it non-viable for many classes of gamedev. After plenty of discussions and [a long community feedback period](https://github.com/bevyengine/bevy/discussions/3972), we've identified a number missing features: * **Asset Preprocessing**: it should be possible to "preprocess" / "compile" / "crunch" assets at "development time" rather than when the game starts up. This enables offloading expensive work from deployed apps, faster asset loading, less runtime memory usage, etc. * **Per-Asset Loader Settings**: Individual assets cannot define their own loaders that override the defaults. Additionally, they cannot provide per-asset settings to their loaders. This is a huge limitation, as many asset types don't provide all information necessary for Bevy _inside_ the asset. For example, a raw PNG image says nothing about how it should be sampled (ex: linear vs nearest). * **Asset `.meta` files**: assets should have configuration files stored adjacent to the asset in question, which allows the user to configure asset-type-specific settings. These settings should be accessible during the pre-processing phase. Modifying a `.meta` file should trigger a re-processing / re-load of the asset. It should be possible to configure asset loaders from the meta file. * **Processed Asset Hot Reloading**: Changes to processed assets (or their dependencies) should result in re-processing them and re-loading the results in live Bevy Apps. * **Asset Dependency Tracking**: The current bevy_asset has no good way to wait for asset dependencies to load. It punts this as an exercise for consumers of the loader apis, which is unreasonable and error prone. There should be easy, ergonomic ways to wait for assets to load and block some logic on an asset's entire dependency tree loading. * **Runtime Asset Loading**: it should be (optionally) possible to load arbitrary assets dynamically at runtime. This necessitates being able to deploy and run the asset server alongside Bevy Apps on _all platforms_. For example, we should be able to invoke the shader compiler at runtime, stream scenes from sources like the internet, etc. To keep deployed binaries (and startup times) small, the runtime asset server configuration should be configurable with different settings compared to the "pre processor asset server". * **Multiple Backends**: It should be possible to load assets from arbitrary sources (filesystems, the internet, remote asset serves, etc). * **Asset Packing**: It should be possible to deploy assets in compressed "packs", which makes it easier and more efficient to distribute assets with Bevy Apps. * **Asset Handoff**: It should be possible to hold a "live" asset handle, which correlates to runtime data, without actually holding the asset in memory. Ex: it must be possible to hold a reference to a GPU mesh generated from a "mesh asset" without keeping the mesh data in CPU memory * **Per-Platform Processed Assets**: Different platforms and app distributions have different capabilities and requirements. Some platforms need lower asset resolutions or different asset formats to operate within the hardware constraints of the platform. It should be possible to define per-platform asset processing profiles. And it should be possible to deploy only the assets required for a given platform. These features have architectural implications that are significant enough to require a full rewrite. The current Bevy Asset implementation got us this far, but it can take us no farther. This PR defines a brand new asset system that implements most of these features, while laying the foundations for the remaining features to be built. ## Bevy Asset V2 Here is a quick overview of the features introduced in this PR. * **Asset Preprocessing**: Preprocess assets at development time into more efficient (and configurable) representations * **Dependency Aware**: Dependencies required to process an asset are tracked. If an asset's processed dependency changes, it will be reprocessed * **Hot Reprocessing/Reloading**: detect changes to asset source files, reprocess them if they have changed, and then hot-reload them in Bevy Apps. * **Only Process Changes**: Assets are only re-processed when their source file (or meta file) has changed. This uses hashing and timestamps to avoid processing assets that haven't changed. * **Transactional and Reliable**: Uses write-ahead logging (a technique commonly used by databases) to recover from crashes / forced-exits. Whenever possible it avoids full-reprocessing / only uncompleted transactions will be reprocessed. When the processor is running in parallel with a Bevy App, processor asset writes block Bevy App asset reads. Reading metadata + asset bytes is guaranteed to be transactional / correctly paired. * **Portable / Run anywhere / Database-free**: The processor does not rely on an in-memory database (although it uses some database techniques for reliability). This is important because pretty much all in-memory databases have unsupported platforms or build complications. * **Configure Processor Defaults Per File Type**: You can say "use this processor for all files of this type". * **Custom Processors**: The `Processor` trait is flexible and unopinionated. It can be implemented by downstream plugins. * **LoadAndSave Processors**: Most asset processing scenarios can be expressed as "run AssetLoader A, save the results using AssetSaver X, and then load the result using AssetLoader B". For example, load this png image using `PngImageLoader`, which produces an `Image` asset and then save it using `CompressedImageSaver` (which also produces an `Image` asset, but in a compressed format), which takes an `Image` asset as input. This means if you have an `AssetLoader` for an asset, you are already half way there! It also means that you can share AssetSavers across multiple loaders. Because `CompressedImageSaver` accepts Bevy's generic Image asset as input, it means you can also use it with some future `JpegImageLoader`. * **Loader and Saver Settings**: Asset Loaders and Savers can now define their own settings types, which are passed in as input when an asset is loaded / saved. Each asset can define its own settings. * **Asset `.meta` files**: configure asset loaders, their settings, enable/disable processing, and configure processor settings * **Runtime Asset Dependency Tracking** Runtime asset dependencies (ex: if an asset contains a `Handle<Image>`) are tracked by the asset server. An event is emitted when an asset and all of its dependencies have been loaded * **Unprocessed Asset Loading**: Assets do not require preprocessing. They can be loaded directly. A processed asset is just a "normal" asset with some extra metadata. Asset Loaders don't need to know or care about whether or not an asset was processed. * **Async Asset IO**: Asset readers/writers use async non-blocking interfaces. Note that because Rust doesn't yet support async traits, there is a bit of manual Boxing / Future boilerplate. This will hopefully be removed in the near future when Rust gets async traits. * **Pluggable Asset Readers and Writers**: Arbitrary asset source readers/writers are supported, both by the processor and the asset server. * **Better Asset Handles** * **Single Arc Tree**: Asset Handles now use a single arc tree that represents the lifetime of the asset. This makes their implementation simpler, more efficient, and allows us to cheaply attach metadata to handles. Ex: the AssetPath of a handle is now directly accessible on the handle itself! * **Const Typed Handles**: typed handles can be constructed in a const context. No more weird "const untyped converted to typed at runtime" patterns! * **Handles and Ids are Smaller / Faster To Hash / Compare**: Typed `Handle<T>` is now much smaller in memory and `AssetId<T>` is even smaller. * **Weak Handle Usage Reduction**: In general Handles are now considered to be "strong". Bevy features that previously used "weak `Handle<T>`" have been ported to `AssetId<T>`, which makes it statically clear that the features do not hold strong handles (while retaining strong type information). Currently Handle::Weak still exists, but it is very possible that we can remove that entirely. * **Efficient / Dense Asset Ids**: Assets now have efficient dense runtime asset ids, which means we can avoid expensive hash lookups. Assets are stored in Vecs instead of HashMaps. There are now typed and untyped ids, which means we no longer need to store dynamic type information in the ID for typed handles. "AssetPathId" (which was a nightmare from a performance and correctness standpoint) has been entirely removed in favor of dense ids (which are retrieved for a path on load) * **Direct Asset Loading, with Dependency Tracking**: Assets that are defined at runtime can still have their dependencies tracked by the Asset Server (ex: if you create a material at runtime, you can still wait for its textures to load). This is accomplished via the (currently optional) "asset dependency visitor" trait. This system can also be used to define a set of assets to load, then wait for those assets to load. * **Async folder loading**: Folder loading also uses this system and immediately returns a handle to the LoadedFolder asset, which means folder loading no longer blocks on directory traversals. * **Improved Loader Interface**: Loaders now have a specific "top level asset type", which makes returning the top-level asset simpler and statically typed. * **Basic Image Settings and Processing**: Image assets can now be processed into the gpu-friendly Basic Universal format. The ImageLoader now has a setting to define what format the image should be loaded as. Note that this is just a minimal MVP ... plenty of additional work to do here. To demo this, enable the `basis-universal` feature and turn on asset processing. * **Simpler Audio Play / AudioSink API**: Asset handle providers are cloneable, which means the Audio resource can mint its own handles. This means you can now do `let sink_handle = audio.play(music)` instead of `let sink_handle = audio_sinks.get_handle(audio.play(music))`. Note that this might still be replaced by https://github.com/bevyengine/bevy/pull/8424. **Removed Handle Casting From Engine Features**: Ex: FontAtlases no longer use casting between handle types ## Using The New Asset System ### Normal Unprocessed Asset Loading By default the `AssetPlugin` does not use processing. It behaves pretty much the same way as the old system. If you are defining a custom asset, first derive `Asset`: ```rust #[derive(Asset)] struct Thing { value: String, } ``` Initialize the asset: ```rust app.init_asset:<Thing>() ``` Implement a new `AssetLoader` for it: ```rust #[derive(Default)] struct ThingLoader; #[derive(Serialize, Deserialize, Default)] pub struct ThingSettings { some_setting: bool, } impl AssetLoader for ThingLoader { type Asset = Thing; type Settings = ThingSettings; fn load<'a>( &'a self, reader: &'a mut Reader, settings: &'a ThingSettings, load_context: &'a mut LoadContext, ) -> BoxedFuture<'a, Result<Thing, anyhow::Error>> { Box::pin(async move { let mut bytes = Vec::new(); reader.read_to_end(&mut bytes).await?; // convert bytes to value somehow Ok(Thing { value }) }) } fn extensions(&self) -> &[&str] { &["thing"] } } ``` Note that this interface will get much cleaner once Rust gets support for async traits. `Reader` is an async futures_io::AsyncRead. You can stream bytes as they come in or read them all into a `Vec<u8>`, depending on the context. You can use `let handle = load_context.load(path)` to kick off a dependency load, retrieve a handle, and register the dependency for the asset. Then just register the loader in your Bevy app: ```rust app.init_asset_loader::<ThingLoader>() ``` Now just add your `Thing` asset files into the `assets` folder and load them like this: ```rust fn system(asset_server: Res<AssetServer>) { let handle = Handle<Thing> = asset_server.load("cool.thing"); } ``` You can check load states directly via the asset server: ```rust if asset_server.load_state(&handle) == LoadState::Loaded { } ``` You can also listen for events: ```rust fn system(mut events: EventReader<AssetEvent<Thing>>, handle: Res<SomeThingHandle>) { for event in events.iter() { if event.is_loaded_with_dependencies(&handle) { } } } ``` Note the new `AssetEvent::LoadedWithDependencies`, which only fires when the asset is loaded _and_ all dependencies (and their dependencies) have loaded. Unlike the old asset system, for a given asset path all `Handle<T>` values point to the same underlying Arc. This means Handles can cheaply hold more asset information, such as the AssetPath: ```rust // prints the AssetPath of the handle info!("{:?}", handle.path()) ``` ### Processed Assets Asset processing can be enabled via the `AssetPlugin`. When developing Bevy Apps with processed assets, do this: ```rust app.add_plugins(DefaultPlugins.set(AssetPlugin::processed_dev())) ``` This runs the `AssetProcessor` in the background with hot-reloading. It reads assets from the `assets` folder, processes them, and writes them to the `.imported_assets` folder. Asset loads in the Bevy App will wait for a processed version of the asset to become available. If an asset in the `assets` folder changes, it will be reprocessed and hot-reloaded in the Bevy App. When deploying processed Bevy apps, do this: ```rust app.add_plugins(DefaultPlugins.set(AssetPlugin::processed())) ``` This does not run the `AssetProcessor` in the background. It behaves like `AssetPlugin::unprocessed()`, but reads assets from `.imported_assets`. When the `AssetProcessor` is running, it will populate sibling `.meta` files for assets in the `assets` folder. Meta files for assets that do not have a processor configured look like this: ```rust ( meta_format_version: "1.0", asset: Load( loader: "bevy_render::texture::image_loader::ImageLoader", settings: ( format: FromExtension, ), ), ) ``` This is metadata for an image asset. For example, if you have `assets/my_sprite.png`, this could be the metadata stored at `assets/my_sprite.png.meta`. Meta files are totally optional. If no metadata exists, the default settings will be used. In short, this file says "load this asset with the ImageLoader and use the file extension to determine the image type". This type of meta file is supported in all AssetPlugin modes. If in `Unprocessed` mode, the asset (with the meta settings) will be loaded directly. If in `ProcessedDev` mode, the asset file will be copied directly to the `.imported_assets` folder. The meta will also be copied directly to the `.imported_assets` folder, but with one addition: ```rust ( meta_format_version: "1.0", processed_info: Some(( hash: 12415480888597742505, full_hash: 14344495437905856884, process_dependencies: [], )), asset: Load( loader: "bevy_render::texture::image_loader::ImageLoader", settings: ( format: FromExtension, ), ), ) ``` `processed_info` contains `hash` (a direct hash of the asset and meta bytes), `full_hash` (a hash of `hash` and the hashes of all `process_dependencies`), and `process_dependencies` (the `path` and `full_hash` of every process_dependency). A "process dependency" is an asset dependency that is _directly_ used when processing the asset. Images do not have process dependencies, so this is empty. When the processor is enabled, you can use the `Process` metadata config: ```rust ( meta_format_version: "1.0", asset: Process( processor: "bevy_asset::processor::process::LoadAndSave<bevy_render::texture::image_loader::ImageLoader, bevy_render::texture::compressed_image_saver::CompressedImageSaver>", settings: ( loader_settings: ( format: FromExtension, ), saver_settings: ( generate_mipmaps: true, ), ), ), ) ``` This configures the asset to use the `LoadAndSave` processor, which runs an AssetLoader and feeds the result into an AssetSaver (which saves the given Asset and defines a loader to load it with). (for terseness LoadAndSave will likely get a shorter/friendlier type name when [Stable Type Paths](#7184) lands). `LoadAndSave` is likely to be the most common processor type, but arbitrary processors are supported. `CompressedImageSaver` saves an `Image` in the Basis Universal format and configures the ImageLoader to load it as basis universal. The `AssetProcessor` will read this meta, run it through the LoadAndSave processor, and write the basis-universal version of the image to `.imported_assets`. The final metadata will look like this: ```rust ( meta_format_version: "1.0", processed_info: Some(( hash: 905599590923828066, full_hash: 9948823010183819117, process_dependencies: [], )), asset: Load( loader: "bevy_render::texture::image_loader::ImageLoader", settings: ( format: Format(Basis), ), ), ) ``` To try basis-universal processing out in Bevy examples, (for example `sprite.rs`), change `add_plugins(DefaultPlugins)` to `add_plugins(DefaultPlugins.set(AssetPlugin::processed_dev()))` and run with the `basis-universal` feature enabled: `cargo run --features=basis-universal --example sprite`. To create a custom processor, there are two main paths: 1. Use the `LoadAndSave` processor with an existing `AssetLoader`. Implement the `AssetSaver` trait, register the processor using `asset_processor.register_processor::<LoadAndSave<ImageLoader, CompressedImageSaver>>(image_saver.into())`. 2. Implement the `Process` trait directly and register it using: `asset_processor.register_processor(thing_processor)`. You can configure default processors for file extensions like this: ```rust asset_processor.set_default_processor::<ThingProcessor>("thing") ``` There is one more metadata type to be aware of: ```rust ( meta_format_version: "1.0", asset: Ignore, ) ``` This will ignore the asset during processing / prevent it from being written to `.imported_assets`. The AssetProcessor stores a transaction log at `.imported_assets/log` and uses it to gracefully recover from unexpected stops. This means you can force-quit the processor (and Bevy Apps running the processor in parallel) at arbitrary times! `.imported_assets` is "local state". It should _not_ be checked into source control. It should also be considered "read only". In practice, you _can_ modify processed assets and processed metadata if you really need to test something. But those modifications will not be represented in the hashes of the assets, so the processed state will be "out of sync" with the source assets. The processor _will not_ fix this for you. Either revert the change after you have tested it, or delete the processed files so they can be re-populated. ## Open Questions There are a number of open questions to be discussed. We should decide if they need to be addressed in this PR and if so, how we will address them: ### Implied Dependencies vs Dependency Enumeration There are currently two ways to populate asset dependencies: * **Implied via AssetLoaders**: if an AssetLoader loads an asset (and retrieves a handle), a dependency is added to the list. * **Explicit via the optional Asset::visit_dependencies**: if `server.load_asset(my_asset)` is called, it will call `my_asset.visit_dependencies`, which will grab dependencies that have been manually defined for the asset via the Asset trait impl (which can be derived). This means that defining explicit dependencies is optional for "loaded assets". And the list of dependencies is always accurate because loaders can only produce Handles if they register dependencies. If an asset was loaded with an AssetLoader, it only uses the implied dependencies. If an asset was created at runtime and added with `asset_server.load_asset(MyAsset)`, it will use `Asset::visit_dependencies`. However this can create a behavior mismatch between loaded assets and equivalent "created at runtime" assets if `Assets::visit_dependencies` doesn't exactly match the dependencies produced by the AssetLoader. This behavior mismatch can be resolved by completely removing "implied loader dependencies" and requiring `Asset::visit_dependencies` to supply dependency data. But this creates two problems: * It makes defining loaded assets harder and more error prone: Devs must remember to manually annotate asset dependencies with `#[dependency]` when deriving `Asset`. For more complicated assets (such as scenes), the derive likely wouldn't be sufficient and a manual `visit_dependencies` impl would be required. * Removes the ability to immediately kick off dependency loads: When AssetLoaders retrieve a Handle, they also immediately kick off an asset load for the handle, which means it can start loading in parallel _before_ the asset finishes loading. For large assets, this could be significant. (although this could be mitigated for processed assets if we store dependencies in the processed meta file and load them ahead of time) ### Eager ProcessorDev Asset Loading I made a controversial call in the interest of fast startup times ("time to first pixel") for the "processor dev mode configuration". When initializing the AssetProcessor, current processed versions of unchanged assets are yielded immediately, even if their dependencies haven't been checked yet for reprocessing. This means that non-current-state-of-filesystem-but-previously-valid assets might be returned to the App first, then hot-reloaded if/when their dependencies change and the asset is reprocessed. Is this behavior desirable? There is largely one alternative: do not yield an asset from the processor to the app until all of its dependencies have been checked for changes. In some common cases (load dependency has not changed since last run) this will increase startup time. The main question is "by how much" and is that slower startup time worth it in the interest of only yielding assets that are true to the current state of the filesystem. Should this be configurable? I'm starting to think we should only yield an asset after its (historical) dependencies have been checked for changes + processed as necessary, but I'm curious what you all think. ### Paths Are Currently The Only Canonical ID / Do We Want Asset UUIDs? In this implementation AssetPaths are the only canonical asset identifier (just like the previous Bevy Asset system and Godot). Moving assets will result in re-scans (and currently reprocessing, although reprocessing can easily be avoided with some changes). Asset renames/moves will break code and assets that rely on specific paths, unless those paths are fixed up. Do we want / need "stable asset uuids"? Introducing them is very possible: 1. Generate a UUID and include it in .meta files 2. Support UUID in AssetPath 3. Generate "asset indices" which are loaded on startup and map UUIDs to paths. 4 (maybe). Consider only supporting UUIDs for processed assets so we can generate quick-to-load indices instead of scanning meta files. The main "pro" is that assets referencing UUIDs don't need to be migrated when a path changes. The main "con" is that UUIDs cannot be "lazily resolved" like paths. They need a full view of all assets to answer the question "does this UUID exist". Which means UUIDs require the AssetProcessor to fully finish startup scans before saying an asset doesnt exist. And they essentially require asset pre-processing to use in apps, because scanning all asset metadata files at runtime to resolve a UUID is not viable for medium-to-large apps. It really requires a pre-generated UUID index, which must be loaded before querying for assets. I personally think this should be investigated in a separate PR. Paths aren't going anywhere ... _everyone_ uses filesystems (and filesystem-like apis) to manage their asset source files. I consider them permanent canonical asset information. Additionally, they behave well for both processed and unprocessed asset modes. Given that Bevy is supporting both, this feels like the right canonical ID to start with. UUIDS (and maybe even other indexed-identifier types) can be added later as necessary. ### Folder / File Naming Conventions All asset processing config currently lives in the `.imported_assets` folder. The processor transaction log is in `.imported_assets/log`. Processed assets are added to `.imported_assets/Default`, which will make migrating to processed asset profiles (ex: a `.imported_assets/Mobile` profile) a non-breaking change. It also allows us to create top-level files like `.imported_assets/log` without it being interpreted as an asset. Meta files currently have a `.meta` suffix. Do we like these names and conventions? ### Should the `AssetPlugin::processed_dev` configuration enable `watch_for_changes` automatically? Currently it does (which I think makes sense), but it does make it the only configuration that enables watch_for_changes by default. ### Discuss on_loaded High Level Interface: This PR includes a very rough "proof of concept" `on_loaded` system adapter that uses the `LoadedWithDependencies` event in combination with `asset_server.load_asset` dependency tracking to support this pattern ```rust fn main() { App::new() .init_asset::<MyAssets>() .add_systems(Update, on_loaded(create_array_texture)) .run(); } #[derive(Asset, Clone)] struct MyAssets { #[dependency] picture_of_my_cat: Handle<Image>, #[dependency] picture_of_my_other_cat: Handle<Image>, } impl FromWorld for ArrayTexture { fn from_world(world: &mut World) -> Self { picture_of_my_cat: server.load("meow.png"), picture_of_my_other_cat: server.load("meeeeeeeow.png"), } } fn spawn_cat(In(my_assets): In<MyAssets>, mut commands: Commands) { commands.spawn(SpriteBundle { texture: my_assets.picture_of_my_cat.clone(), ..default() }); commands.spawn(SpriteBundle { texture: my_assets.picture_of_my_other_cat.clone(), ..default() }); } ``` The implementation is _very_ rough. And it is currently unsafe because `bevy_ecs` doesn't expose some internals to do this safely from inside `bevy_asset`. There are plenty of unanswered questions like: * "do we add a Loadable" derive? (effectively automate the FromWorld implementation above) * Should `MyAssets` even be an Asset? (largely implemented this way because it elegantly builds on `server.load_asset(MyAsset { .. })` dependency tracking). We should think hard about what our ideal API looks like (and if this is a pattern we want to support). Not necessarily something we need to solve in this PR. The current `on_loaded` impl should probably be removed from this PR before merging. ## Clarifying Questions ### What about Assets as Entities? This Bevy Asset V2 proposal implementation initially stored Assets as ECS Entities. Instead of `AssetId<T>` + the `Assets<T>` resource it used `Entity` as the asset id and Asset values were just ECS components. There are plenty of compelling reasons to do this: 1. Easier to inline assets in Bevy Scenes (as they are "just" normal entities + components) 2. More flexible queries: use the power of the ECS to filter assets (ex: `Query<Mesh, With<Tree>>`). 3. Extensible. Users can add arbitrary component data to assets. 4. Things like "component visualization tools" work out of the box to visualize asset data. However Assets as Entities has a ton of caveats right now: * We need to be able to allocate entity ids without a direct World reference (aka rework id allocator in Entities ... i worked around this in my prototypes by just pre allocating big chunks of entities) * We want asset change events in addition to ECS change tracking ... how do we populate them when mutations can come from anywhere? Do we use Changed queries? This would require iterating over the change data for all assets every frame. Is this acceptable or should we implement a new "event based" component change detection option? * Reconciling manually created assets with asset-system managed assets has some nuance (ex: are they "loaded" / do they also have that component metadata?) * "how do we handle "static" / default entity handles" (ties in to the Entity Indices discussion: https://github.com/bevyengine/bevy/discussions/8319). This is necessary for things like "built in" assets and default handles in things like SpriteBundle. * Storing asset information as a component makes it easy to "invalidate" asset state by removing the component (or forcing modifications). Ideally we have ways to lock this down (some combination of Rust type privacy and ECS validation) In practice, how we store and identify assets is a reasonably superficial change (porting off of Assets as Entities and implementing dedicated storage + ids took less than a day). So once we sort out the remaining challenges the flip should be straightforward. Additionally, I do still have "Assets as Entities" in my commit history, so we can reuse that work. I personally think "assets as entities" is a good endgame, but it also doesn't provide _significant_ value at the moment and it certainly isn't ready yet with the current state of things. ### Why not Distill? [Distill](https://github.com/amethyst/distill) is a high quality fully featured asset system built in Rust. It is very natural to ask "why not just use Distill?". It is also worth calling out that for awhile, [we planned on adopting Distill / I signed off on it](https://github.com/bevyengine/bevy/issues/708). However I think Bevy has a number of constraints that make Distill adoption suboptimal: * **Architectural Simplicity:** * Distill's processor requires an in-memory database (lmdb) and RPC networked API (using Cap'n Proto). Each of these introduces API complexity that increases maintenance burden and "code grokability". Ignoring tests, documentation, and examples, Distill has 24,237 lines of Rust code (including generated code for RPC + database interactions). If you ignore generated code, it has 11,499 lines. * Bevy builds the AssetProcessor and AssetServer using pluggable AssetReader/AssetWriter Rust traits with simple io interfaces. They do not necessitate databases or RPC interfaces (although Readers/Writers could use them if that is desired). Bevy Asset V2 (at the time of writing this PR) is 5,384 lines of Rust code (ignoring tests, documentation, and examples). Grain of salt: Distill does have more features currently (ex: Asset Packing, GUIDS, remote-out-of-process asset processor). I do plan to implement these features in Bevy Asset V2 and I personally highly doubt they will meaningfully close the 6115 lines-of-code gap. * This complexity gap (which while illustrated by lines of code, is much bigger than just that) is noteworthy to me. Bevy should be hackable and there are pillars of Distill that are very hard to understand and extend. This is a matter of opinion (and Bevy Asset V2 also has complicated areas), but I think Bevy Asset V2 is much more approachable for the average developer. * Necessary disclaimer: counting lines of code is an extremely rough complexity metric. Read the code and form your own opinions. * **Optional Asset Processing:** Not all Bevy Apps (or Bevy App developers) need / want asset preprocessing. Processing increases the complexity of the development environment by introducing things like meta files, imported asset storage, running processors in the background, waiting for processing to finish, etc. Distill _requires_ preprocessing to work. With Bevy Asset V2 processing is fully opt-in. The AssetServer isn't directly aware of asset processors at all. AssetLoaders only care about converting bytes to runtime Assets ... they don't know or care if the bytes were pre-processed or not. Processing is "elegantly" (forgive my self-congratulatory phrasing) layered on top and builds on the existing Asset system primitives. * **Direct Filesystem Access to Processed Asset State:** Distill stores processed assets in a database. This makes debugging / inspecting the processed outputs harder (either requires special tooling to query the database or they need to be "deployed" to be inspected). Bevy Asset V2, on the other hand, stores processed assets in the filesystem (by default ... this is configurable). This makes interacting with the processed state more natural. Note that both Godot and Unity's new asset system store processed assets in the filesystem. * **Portability**: Because Distill's processor uses lmdb and RPC networking, it cannot be run on certain platforms (ex: lmdb is a non-rust dependency that cannot run on the web, some platforms don't support running network servers). Bevy should be able to process assets everywhere (ex: run the Bevy Editor on the web, compile + process shaders on mobile, etc). Distill does partially mitigate this problem by supporting "streaming" assets via the RPC protocol, but this is not a full solve from my perspective. And Bevy Asset V2 can (in theory) also stream assets (without requiring RPC, although this isn't implemented yet) Note that I _do_ still think Distill would be a solid asset system for Bevy. But I think the approach in this PR is a better solve for Bevy's specific "asset system requirements". ### Doesn't async-fs just shim requests to "sync" `std::fs`? What is the point? "True async file io" has limited / spotty platform support. async-fs (and the rust async ecosystem generally ... ex Tokio) currently use async wrappers over std::fs that offload blocking requests to separate threads. This may feel unsatisfying, but it _does_ still provide value because it prevents our task pools from blocking on file system operations (which would prevent progress when there are many tasks to do, but all threads in a pool are currently blocking on file system ops). Additionally, using async APIs for our AssetReaders and AssetWriters also provides value because we can later add support for "true async file io" for platforms that support it. _And_ we can implement other "true async io" asset backends (such as networked asset io). ## Draft TODO - [x] Fill in missing filesystem event APIs: file removed event (which is expressed as dangling RenameFrom events in some cases), file/folder renamed event - [x] Assets without loaders are not moved to the processed folder. This breaks things like referenced `.bin` files for GLTFs. This should be configurable per-non-asset-type. - [x] Initial implementation of Reflect and FromReflect for Handle. The "deserialization" parity bar is low here as this only worked with static UUIDs in the old impl ... this is a non-trivial problem. Either we add a Handle::AssetPath variant that gets "upgraded" to a strong handle on scene load or we use a separate AssetRef type for Bevy scenes (which is converted to a runtime Handle on load). This deserves its own discussion in a different pr. - [x] Populate read_asset_bytes hash when run by the processor (a bit of a special case .. when run by the processor the processed meta will contain the hash so we don't need to compute it on the spot, but we don't want/need to read the meta when run by the main AssetServer) - [x] Delay hot reloading: currently filesystem events are handled immediately, which creates timing issues in some cases. For example hot reloading images can sometimes break because the image isn't finished writing. We should add a delay, likely similar to the [implementation in this PR](https://github.com/bevyengine/bevy/pull/8503). - [x] Port old platform-specific AssetIo implementations to the new AssetReader interface (currently missing Android and web) - [x] Resolve on_loaded unsafety (either by removing the API entirely or removing the unsafe) - [x] Runtime loader setting overrides - [x] Remove remaining unwraps that should be error-handled. There are number of TODOs here - [x] Pretty AssetPath Display impl - [x] Document more APIs - [x] Resolve spurious "reloading because it has changed" events (to repro run load_gltf with `processed_dev()`) - [x] load_dependency hot reloading currently only works for processed assets. If processing is disabled, load_dependency changes are not hot reloaded. - [x] Replace AssetInfo dependency load/fail counters with `loading_dependencies: HashSet<UntypedAssetId>` to prevent reloads from (potentially) breaking counters. Storing this will also enable "dependency reloaded" events (see [Next Steps](#next-steps)) - [x] Re-add filesystem watcher cargo feature gate (currently it is not optional) - [ ] Migration Guide - [ ] Changelog ## Followup TODO - [ ] Replace "eager unchanged processed asset loading" behavior with "don't returned unchanged processed asset until dependencies have been checked". - [ ] Add true `Ignore` AssetAction that does not copy the asset to the imported_assets folder. - [ ] Finish "live asset unloading" (ex: free up CPU asset memory after uploading an image to the GPU), rethink RenderAssets, and port renderer features. The `Assets` collection uses `Option<T>` for asset storage to support its removal. (1) the Option might not actually be necessary ... might be able to just remove from the collection entirely (2) need to finalize removal apis - [ ] Try replacing the "channel based" asset id recycling with something a bit more efficient (ex: we might be able to use raw atomic ints with some cleverness) - [ ] Consider adding UUIDs to processed assets (scoped just to helping identify moved assets ... not exposed to load queries ... see [Next Steps](#next-steps)) - [ ] Store "last modified" source asset and meta timestamps in processed meta files to enable skipping expensive hashing when the file wasn't changed - [ ] Fix "slow loop" handle drop fix - [ ] Migrate to TypeName - [x] Handle "loader preregistration". See #9429 ## Next Steps * **Configurable per-type defaults for AssetMeta**: It should be possible to add configuration like "all png image meta should default to using nearest sampling" (currently this hard-coded per-loader/processor Settings::default() impls). Also see the "Folder Meta" bullet point. * **Avoid Reprocessing on Asset Renames / Moves**: See the "canonical asset ids" discussion in [Open Questions](#open-questions) and the relevant bullet point in [Draft TODO](#draft-todo). Even without canonical ids, folder renames could avoid reprocessing in some cases. * **Multiple Asset Sources**: Expand AssetPath to support "asset source names" and support multiple AssetReaders in the asset server (ex: `webserver://some_path/image.png` backed by an Http webserver AssetReader). The "default" asset reader would use normal `some_path/image.png` paths. Ideally this works in combination with multiple AssetWatchers for hot-reloading * **Stable Type Names**: this pr removes the TypeUuid requirement from assets in favor of `std::any::type_name`. This makes defining assets easier (no need to generate a new uuid / use weird proc macro syntax). It also makes reading meta files easier (because things have "friendly names"). We also use type names for components in scene files. If they are good enough for components, they are good enough for assets. And consistency across Bevy pillars is desirable. However, `std::any::type_name` is not guaranteed to be stable (although in practice it is). We've developed a [stable type path](https://github.com/bevyengine/bevy/pull/7184) to resolve this, which should be adopted when it is ready. * **Command Line Interface**: It should be possible to run the asset processor in a separate process from the command line. This will also require building a network-server-backed AssetReader to communicate between the app and the processor. We've been planning to build a "bevy cli" for awhile. This seems like a good excuse to build it. * **Asset Packing**: This is largely an additive feature, so it made sense to me to punt this until we've laid the foundations in this PR. * **Per-Platform Processed Assets**: It should be possible to generate assets for multiple platforms by supporting multiple "processor profiles" per asset (ex: compress with format X on PC and Y on iOS). I think there should probably be arbitrary "profiles" (which can be separate from actual platforms), which are then assigned to a given platform when generating the final asset distribution for that platform. Ex: maybe devs want a "Mobile" profile that is shared between iOS and Android. Or a "LowEnd" profile shared between web and mobile. * **Versioning and Migrations**: Assets, Loaders, Savers, and Processors need to have versions to determine if their schema is valid. If an asset / loader version is incompatible with the current version expected at runtime, the processor should be able to migrate them. I think we should try using Bevy Reflect for this, as it would allow us to load the old version as a dynamic Reflect type without actually having the old Rust type. It would also allow us to define "patches" to migrate between versions (Bevy Reflect devs are currently working on patching). The `.meta` file already has its own format version. Migrating that to new versions should also be possible. * **Real Copy-on-write AssetPaths**: Rust's actual Cow (clone-on-write type) currently used by AssetPath can still result in String clones that aren't actually necessary (cloning an Owned Cow clones the contents). Bevy's asset system requires cloning AssetPaths in a number of places, which result in actual clones of the internal Strings. This is not efficient. AssetPath internals should be reworked to exhibit truer cow-like-behavior that reduces String clones to the absolute minimum. * **Consider processor-less processing**: In theory the AssetServer could run processors "inline" even if the background AssetProcessor is disabled. If we decide this is actually desirable, we could add this. But I don't think its a priority in the short or medium term. * **Pre-emptive dependency loading**: We could encode dependencies in processed meta files, which could then be used by the Asset Server to kick of dependency loads as early as possible (prior to starting the actual asset load). Is this desirable? How much time would this save in practice? * **Optimize Processor With UntypedAssetIds**: The processor exclusively uses AssetPath to identify assets currently. It might be possible to swap these out for UntypedAssetIds in some places, which are smaller / cheaper to hash and compare. * **One to Many Asset Processing**: An asset source file that produces many assets currently must be processed into a single "processed" asset source. If labeled assets can be written separately they can each have their own configured savers _and_ they could be loaded more granularly. Definitely worth exploring! * **Automatically Track "Runtime-only" Asset Dependencies**: Right now, tracking "created at runtime" asset dependencies requires adding them via `asset_server.load_asset(StandardMaterial::default())`. I think with some cleverness we could also do this for `materials.add(StandardMaterial::default())`, making tracking work "everywhere". There are challenges here relating to change detection / ensuring the server is made aware of dependency changes. This could be expensive in some cases. * **"Dependency Changed" events**: Some assets have runtime artifacts that need to be re-generated when one of their dependencies change (ex: regenerate a material's bind group when a Texture needs to change). We are generating the dependency graph so we can definitely produce these events. Buuuuut generating these events will have a cost / they could be high frequency for some assets, so we might want this to be opt-in for specific cases. * **Investigate Storing More Information In Handles**: Handles can now store arbitrary information, which makes it cheaper and easier to access. How much should we move into them? Canonical asset load states (via atomics)? (`handle.is_loaded()` would be very cool). Should we store the entire asset and remove the `Assets<T>` collection? (`Arc<RwLock<Option<Image>>>`?) * **Support processing and loading files without extensions**: This is a pretty arbitrary restriction and could be supported with very minimal changes. * **Folder Meta**: It would be nice if we could define per folder processor configuration defaults (likely in a `.meta` or `.folder_meta` file). Things like "default to linear filtering for all Images in this folder". * **Replace async_broadcast with event-listener?** This might be approximately drop-in for some uses and it feels more light weight * **Support Running the AssetProcessor on the Web**: Most of the hard work is done here, but there are some easy straggling TODOs (make the transaction log an interface instead of a direct file writer so we can write a web storage backend, implement an AssetReader/AssetWriter that reads/writes to something like LocalStorage). * **Consider identifying and preventing circular dependencies**: This is especially important for "processor dependencies", as processing will silently never finish in these cases. * **Built-in/Inlined Asset Hot Reloading**: This PR regresses "built-in/inlined" asset hot reloading (previously provided by the DebugAssetServer). I'm intentionally punting this because I think it can be cleanly implemented with "multiple asset sources" by registering a "debug asset source" (ex: `debug://bevy_pbr/src/render/pbr.wgsl` asset paths) in combination with an AssetWatcher for that asset source and support for "manually loading pats with asset bytes instead of AssetReaders". The old DebugAssetServer was quite nasty and I'd love to avoid that hackery going forward. * **Investigate ways to remove double-parsing meta files**: Parsing meta files currently involves parsing once with "minimal" versions of the meta file to extract the type name of the loader/processor config, then parsing again to parse the "full" meta. This is suboptimal. We should be able to define custom deserializers that (1) assume the loader/processor type name comes first (2) dynamically looks up the loader/processor registrations to deserialize settings in-line (similar to components in the bevy scene format). Another alternative: deserialize as dynamic Reflect objects and then convert. * **More runtime loading configuration**: Support using the Handle type as a hint to select an asset loader (instead of relying on AssetPath extensions) * **More high level Processor trait implementations**: For example, it might be worth adding support for arbitrary chains of "asset transforms" that modify an in-memory asset representation between loading and saving. (ex: load a Mesh, run a `subdivide_mesh` transform, followed by a `flip_normals` transform, then save the mesh to an efficient compressed format). * **Bevy Scene Handle Deserialization**: (see the relevant [Draft TODO item](#draft-todo) for context) * **Explore High Level Load Interfaces**: See [this discussion](#discuss-on_loaded-high-level-interface) for one prototype. * **Asset Streaming**: It would be great if we could stream Assets (ex: stream a long video file piece by piece) * **ID Exchanging**: In this PR Asset Handles/AssetIds are bigger than they need to be because they have a Uuid enum variant. If we implement an "id exchanging" system that trades Uuids for "efficient runtime ids", we can cut down on the size of AssetIds, making them more efficient. This has some open design questions, such as how to spawn entities with "default" handle values (as these wouldn't have access to the exchange api in the current system). * **Asset Path Fixup Tooling**: Assets that inline asset paths inside them will break when an asset moves. The asset system provides the functionality to detect when paths break. We should build a framework that enables formats to define "path migrations". This is especially important for scene files. For editor-generated files, we should also consider using UUIDs (see other bullet point) to avoid the need to migrate in these cases. --------- Co-authored-by: BeastLe9enD <beastle9end@outlook.de> Co-authored-by: Mike <mike.hsu@gmail.com> Co-authored-by: Nicola Papale <nicopap@users.noreply.github.com>	2023-09-07 02:07:27 +00:00
Félix Lescaudey de Maneville	a2b5d7a198	Fix some nightly warnings (#9672) ... # Objective Fix some nightly warnings found by running `cargo +nightly clippy` ## Solution Fix the following warnings: - [x] [elided_lifetimes_in_associated_constant](https://github.com/rust-lang/rust/issues/115010) 221986134d - [x] [unwrap_or_default](https://rust-lang.github.io/rust-clippy/master/index.html#/unwrap_or_default) 32e21c78f9 - [x] [needless_pass_by_ref_mut](https://rust-lang.github.io/rust-clippy/master/index.html#/needless_pass_by_ref_mut) c85d6d4a10 There is no breaking change, some internal `bevy_ecs` code no longer uses a few mutable references but I don't think it should cause any regression or be performance sensitive, but there might be some ECS magic I'm unaware of that could break because of those changes	2023-09-02 18:35:06 +00:00
Nicola Papale	ee3cc8ca86	Fix erronenous glam version (#9653) ... # Objective - Fix compilation issue with wrongly specified glam version - bevy uses `Vec2::INFINITY`, depends on `0.24` (equivalent to `0.24.0`) yet it was only introduced in version `0.24.1` Context: https://discord.com/channels/691052431525675048/692572690833473578/1146586570787397794 ## Solution - Bump glam version.	2023-08-31 12:55:17 +00:00
Nicola Papale	365cf3114a	Make the reflect path parser utf-8-unaware (#9371) ... # Objective All delimiter symbols used by the path parser are ASCII, this means we can entirely ignore UTF8 handling. This may improve performance. ## Solution Instead of storing the path as an `&str` + the parser offset, and reading the path using `&self.path[self.offset..]`, we store the parser state in a `&[u8]`. This allows two optimizations: 1. Avoid UTF8 checking on `&self.path[self.offset..]` 2. Avoid any kind of bound checking, since the length of what is left to read is stored in the `&[u8]`'s reference metadata, and is assumed valid by the compiler. This is a major improvement when comparing to the previous parser. 1. `access_following` and `next_token` now inline in `PathParser::next` 2. Benchmarking show a 20% performance increase (#9364) Please note that while we ignore UTF-8 handling, **utf-8 is still supported**. This is because we only handle "at the edges" what happens exactly before and after a recognized `SYMBOL`. utf-8 is handled transparently beyond that.	2023-08-25 23:12:25 +00:00
Nicola Papale	7083f0d593	Make it so ParsedPath can be passed to GetPath (#9373) ... # Objective - Unify the `ParsedPath` and `GetPath` APIs. They weirdly didn't play well together. - Make `ParsedPath` and `GetPath` API easier to use ## Solution - Add the `ReflectPath` trait. - `GetPath` methods now accept an `impl ReflectPath<'a>` instead of a `&'a str`, this mean it also can accepts a `&ParsedPath` - Make `GetPath: Reflect` and use default impl for `Reflect` types. - Add `GetPath` and `ReflectPath` to the `bevy_reflect` prelude --- ## Changelog - Add the `ReflectPath` trait. - `GetPath` methods now accept an `impl ReflectPath<'a>` instead of a `&'a str`, this mean it also can accept a `&ParsedPath` - Make `GetPath: Reflect` and use default impl for `Reflect` types. - Add `GetPath` and `ReflectPath` to the `bevy_reflect` prelude ## Migration Guide `GetPath` now requires `Reflect`. This reduces a lot of boilerplate on bevy's side. If you were implementing manually `GetPath` on your own type, please get in touch! `ParsedPath::element[_mut]` isn't an inherent method of `ParsedPath`, you must now import `ReflectPath`. This is only relevant if you weren't importing the bevy prelude. ```diff -use bevy::reflect::ParsedPath; +use bevy::reflect::{ParsedPath, ReflectPath}; parsed_path.element(reflect_type).unwrap() parsed_path.element(reflect_type).unwrap()	2023-08-25 14:32:41 +00:00
Rob Parrett	a788e31ad5	Fix CI for Rust 1.72 (#9562) ... # Objective [Rust 1.72.0](https://blog.rust-lang.org/2023/08/24/Rust-1.72.0.html) is now stable. # Notes - `let-else` formatting has arrived! - I chose to allow `explicit_iter_loop` due to https://github.com/rust-lang/rust-clippy/issues/11074. We didn't hit any of the false positives that prevent compilation, but fixing this did produce a lot of the "symbol soup" mentioned, e.g. `for image in &mut *image_events {`. Happy to undo this if there's consensus the other way. --------- Co-authored-by: François <mockersf@gmail.com>	2023-08-25 12:34:24 +00:00
Gino Valente	f96cd758cd	bevy_reflect: Opt-out attribute for TypePath (#9140) ... # Objective Fixes #9094 ## Solution Takes a bit from [this](https://github.com/bevyengine/bevy/issues/9094#issuecomment-1629333851) comment as well as a [comment](https://discord.com/channels/691052431525675048/1002362493634629796/1128024873260810271) from @soqb. This allows users to opt-out of the `TypePath` implementation that is automatically generated by the `Reflect` derive macro, allowing custom `TypePath` implementations. ```rust #[derive(Reflect)] #[reflect(type_path = false)] struct Foo<T> { #[reflect(ignore)] _marker: PhantomData<T>, } struct NotTypePath; impl<T: 'static> TypePath for Foo<T> { fn type_path() -> &'static str { std::any::type_name::<Self>() } fn short_type_path() -> &'static str { static CELL: GenericTypePathCell = GenericTypePathCell::new(); CELL.get_or_insert::<Self, _>(|| { bevy_utils::get_short_name(std::any::type_name::<Self>()) }) } fn crate_name() -> Option<&'static str> { Some("my_crate") } fn module_path() -> Option<&'static str> { Some("my_crate::foo") } fn type_ident() -> Option<&'static str> { Some("Foo") } } // Can use `TypePath` let _ = <Foo<NotTypePath> as TypePath>::type_path(); // Can register the type let mut registry = TypeRegistry::default(); registry.register::<Foo<NotTypePath>>(); ``` #### Type Path Stability The stability of type paths mainly come into play during serialization. If a type is moved between builds, an unstable type path may become invalid. Users that opt-out of `TypePath` and rely on something like `std::any::type_name` as in the example above, should be aware that this solution removes the stability guarantees. Deserialization thus expects that type to never move. If it does, then the serialized type paths will need to be updated accordingly. If a user depends on stability, they will need to implement that stability logic manually (probably by looking at the expanded output of a typical `Reflect`/`TypePath` derive). This could be difficult for type parameters that don't/can't implement `TypePath`, and will need to make heavy use of string parsing and manipulation to achieve the same effect (alternatively, they can choose to simply exclude any type parameter that doesn't implement `TypePath`). --- ## Changelog - Added the `#[reflect(type_path = false)]` attribute to opt out of the `TypePath` impl when deriving `Reflect` --------- Co-authored-by: Carter Anderson <mcanders1@gmail.com>	2023-08-10 00:37:56 +00:00
Gino Valente	84f6b879ae	bevy_reflect: Fix combined field attributes (#9322) ... # Objective It seems the behavior of field attributes was accidentally broken at some point. Take the following code: ```rust #[derive(Reflect)] struct Foo { #[reflect(ignore, default)] value: usize } ``` The above code should simply mark `value` as ignored and specify a default behavior. However, what this actually does is discard both. That's especially a problem when we don't want the field to be be given a `Reflect` or `FromReflect` bound (which is why we ignore it in the first place). This only happens when the attributes are combined into one. The following code works properly: ```rust #[derive(Reflect)] struct Foo { #[reflect(ignore)] #[reflect(default)] value: usize } ``` ## Solution Cleaned up the field attribute parsing logic to support combined field attributes. --- ## Changelog - Fixed a bug where `Reflect` derive attributes on fields are not able to be combined into a single attribute	2023-08-07 23:04:00 +00:00
Nicola Papale	10797d4f15	Refactor parsing in bevy_reflect path module (#9048) ... # Objective - Follow up to #8887 - The parsing code in `bevy_reflect/src/path/mod.rs` could also do with some cleanup ## Solution - Create the `parse.rs` module, move all parsing code to this module - The parsing errors also now keep track of the whole parsed string, and are much more fine-grained ### Detailed changes - Move `PathParser` to `parse.rs` submodule - Rename `token_to_access` to `access_following` (yep, goes from 132 lines to 16) - Move parsing tests into the `parse.rs` file	2023-08-05 17:18:13 +00:00
PortalRising	f14300e5d3	Implement reflect trait on new glam types (I64Vec and U64Vec) (#9281) ... # Objective Glam 0.24 added new glam types (```I64Vec``` and ```U64Vec```). However these are not reflectable unlike the other glam types ## Solution Implement reflect for these new types --- ## Changelog Implements reflect with the impl_reflect_struct macro on ```I64Vec2```, ```I64Vec3```, ```I64Vec4```, ```U64Vec2```, ```U64Vec3```, and ```U64Vec4``` types	2023-07-31 19:18:21 +00:00
Nicola Papale	08ea1d18ae	Refactor path module of bevy_reflect (#8887) ... # Objective - The `path` module was getting fairly large. - The code in `AccessRef::read_element` and mut equivalent was very complex and difficult to understand. - The `ReflectPathError` had a lot of variants, and was difficult to read. ## Solution - Split the file in two, `access` now has its own module - Rewrite the `read_element` methods, they were ~200 lines long, they are now ~70 lines long — I didn't change any of the logic. It's really just the same code, but error handling is separated. - Split the `ReflectPathError` error - Merge `AccessRef` and `Access` - A few other changes that aim to reduce code complexity ### Fully detailed change list - `Display` impl of `ParsedPath` now includes prefix dots — this allows simplifying its implementation, and IMO `.path.to.field` is a better way to express a "path" than `path.to.field` which could suggest we are reading the `to` field of a variable named `path` - Add a test to check that dot prefixes and other are correctly parsed — Until now, no test contained a prefixing dot - Merge `Access` and `AccessRef`, using a `Cow<'a, str>`. Generated code seems to agree with this decision (`ParsedPath::parse` sheds 5% of instructions) - Remove `Access::as_ref` since there is no such thing as an `AccessRef` anymore. - Rename `AccessRef::to_owned` into `AccessRef::into_owned()` since it takes ownership of `self` now. - Add a `parse_static` that doesn't allocate new strings for named fields! - Add a section about path reflection in the `bevy_reflect` crate root doc — I saw a few people that weren't aware of path reflection, so I thought it was pertinent to add it to the root doc - a lot of nits - rename `index` to `offset` when it refers to offset in the path string — There is no more confusion with the other kind of indices in this context, also it's a common naming convention for parsing. - Make a dedicated enum for parsing errors - rename the `read_element` methods to `element` — shorter, but also `read_element_mut` was a fairly poor name - The error values now not only contain the expected type but also the actual type. - Remove lifetimes that could be inferred from the `GetPath` trait methods. --- ## Change log - Added the `ParsedPath::parse_static` method, avoids allocating when parsing `&'static str`. ## Migration Guide If you were matching on the `Err(ReflectPathError)` value returned by `GetPath` and `ParsedPath` methods, now only the parse-related errors and the offset are publicly accessible. You can always use the `fmt::Display` to get a clear error message, but if you need programmatic access to the error types, please open an issue. --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> Co-authored-by: Gino Valente <49806985+MrGVSV@users.noreply.github.com>	2023-07-30 19:17:07 +00:00
Arnav Mummineni	bc8e2746d7	Add reflect impls to IRect and URect (#9191) ... # Objective This attempts to make the new IRect and URect structs in bevy_math more similar to the existing Rect struct. ## Solution Add reflect implementations for IRect and URect, since one already exists for Rect.	2023-07-23 01:02:00 +00:00
Carter Anderson	7c3131a761	Bump Version after Release (#9106) ... CI-capable version of #9086 --------- Co-authored-by: Bevy Auto Releaser <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: François <mockersf@gmail.com>	2023-07-10 21:19:27 +00:00
Cptn-Sherman	aa03130234	Fix typo in NamedTypePathDef (#9102) ... # Objective Fixes #9091 ## Solution Rename instances of `Primtive` to `Primitive` ## Migration Guide Before: ```rust let type_path = NamedTypePathDef::Primtive(ident); ``` After: ```rust let type_path = NamedTypePathDef::Primitive(ident); ```	2023-07-10 17:02:16 +00:00
ClayenKitten	ffc572728f	Fix typos throughout the project (#9090) ... # Objective Fix typos throughout the project. ## Solution [`typos`](https://github.com/crate-ci/typos) project was used for scanning, but no automatic corrections were applied. I checked everything by hand before fixing. Most of the changes are documentation/comments corrections. Also, there are few trivial changes to code (variable name, pub(crate) function name and a few error/panic messages). ## Unsolved `bevy_reflect_derive` has [typo](1b51053f19/crates/bevy_reflect/bevy_reflect_derive/src/type_path.rs (L76)) in enum variant name that I didn't fix. Enum is `pub(crate)`, so there shouldn't be any trouble if fixed. However, code is tightly coupled with macro usage, so I decided to leave it for more experienced contributor just in case.	2023-07-10 00:11:51 +00:00
Carter Anderson	8ba9571eed	Release 0.11.0 (#9080) ... I created this manually as Github didn't want to run CI for the workflow-generated PR. I'm guessing we didn't hit this in previous releases because we used bors. Co-authored-by: Bevy Auto Releaser <41898282+github-actions[bot]@users.noreply.github.com>	2023-07-09 08:43:47 +00:00
Gino Valente	aeeb20ec4c	bevy_reflect: FromReflect Ergonomics Implementation (#6056) ... # Objective **This implementation is based on https://github.com/bevyengine/rfcs/pull/59.** --- Resolves #4597 Full details and motivation can be found in the RFC, but here's a brief summary. `FromReflect` is a very powerful and important trait within the reflection API. It allows Dynamic types (e.g., `DynamicList`, etc.) to be formed into Real ones (e.g., `Vec<i32>`, etc.). This mainly comes into play concerning deserialization, where the reflection deserializers both return a `Box<dyn Reflect>` that almost always contain one of these Dynamic representations of a Real type. To convert this to our Real type, we need to use `FromReflect`. It also sneaks up in other ways. For example, it's a required bound for `T` in `Vec<T>` so that `Vec<T>` as a whole can be made `FromReflect`. It's also required by all fields of an enum as it's used as part of the `Reflect::apply` implementation. So in other words, much like `GetTypeRegistration` and `Typed`, it is very much a core reflection trait. The problem is that it is not currently treated like a core trait and is not automatically derived alongside `Reflect`. This makes using it a bit cumbersome and easy to forget. ## Solution Automatically derive `FromReflect` when deriving `Reflect`. Users can then choose to opt-out if needed using the `#[reflect(from_reflect = false)]` attribute. ```rust #[derive(Reflect)] struct Foo; #[derive(Reflect)] #[reflect(from_reflect = false)] struct Bar; fn test<T: FromReflect>(value: T) {} test(Foo); // <-- OK test(Bar); // <-- Panic! Bar does not implement trait `FromReflect` ``` #### `ReflectFromReflect` This PR also automatically adds the `ReflectFromReflect` (introduced in #6245) registration to the derived `GetTypeRegistration` impl— if the type hasn't opted out of `FromReflect` of course. <details> <summary><h4>Improved Deserialization</h4></summary> > **Warning** > This section includes changes that have since been descoped from this PR. They will likely be implemented again in a followup PR. I am mainly leaving these details in for archival purposes, as well as for reference when implementing this logic again. And since we can do all the above, we might as well improve deserialization. We can now choose to deserialize into a Dynamic type or automatically convert it using `FromReflect` under the hood. `[Un]TypedReflectDeserializer::new` will now perform the conversion and return the `Box`'d Real type. `[Un]TypedReflectDeserializer::new_dynamic` will work like what we have now and simply return the `Box`'d Dynamic type. ```rust // Returns the Real type let reflect_deserializer = UntypedReflectDeserializer::new(&registry); let mut deserializer = ron:🇩🇪:Deserializer::from_str(input)?; let output: SomeStruct = reflect_deserializer.deserialize(&mut deserializer)?.take()?; // Returns the Dynamic type let reflect_deserializer = UntypedReflectDeserializer::new_dynamic(&registry); let mut deserializer = ron:🇩🇪:Deserializer::from_str(input)?; let output: DynamicStruct = reflect_deserializer.deserialize(&mut deserializer)?.take()?; ``` </details> --- ## Changelog * `FromReflect` is now automatically derived within the `Reflect` derive macro * This includes auto-registering `ReflectFromReflect` in the derived `GetTypeRegistration` impl * ~~Renamed `TypedReflectDeserializer::new` and `UntypedReflectDeserializer::new` to `TypedReflectDeserializer::new_dynamic` and `UntypedReflectDeserializer::new_dynamic`, respectively~~ **Descoped** * ~~Changed `TypedReflectDeserializer::new` and `UntypedReflectDeserializer::new` to automatically convert the deserialized output using `FromReflect`~~ **Descoped** ## Migration Guide * `FromReflect` is now automatically derived within the `Reflect` derive macro. Items with both derives will need to remove the `FromReflect` one. ```rust // OLD #[derive(Reflect, FromReflect)] struct Foo; // NEW #[derive(Reflect)] struct Foo; ``` If using a manual implementation of `FromReflect` and the `Reflect` derive, users will need to opt-out of the automatic implementation. ```rust // OLD #[derive(Reflect)] struct Foo; impl FromReflect for Foo {/* ... */} // NEW #[derive(Reflect)] #[reflect(from_reflect = false)] struct Foo; impl FromReflect for Foo {/* ... */} ``` <details> <summary><h4>Removed Migrations</h4></summary> > **Warning** > This section includes changes that have since been descoped from this PR. They will likely be implemented again in a followup PR. I am mainly leaving these details in for archival purposes, as well as for reference when implementing this logic again. * The reflect deserializers now perform a `FromReflect` conversion internally. The expected output of `TypedReflectDeserializer::new` and `UntypedReflectDeserializer::new` is no longer a Dynamic (e.g., `DynamicList`), but its Real counterpart (e.g., `Vec<i32>`). ```rust let reflect_deserializer = UntypedReflectDeserializer::new_dynamic(&registry); let mut deserializer = ron:🇩🇪:Deserializer::from_str(input)?; // OLD let output: DynamicStruct = reflect_deserializer.deserialize(&mut deserializer)?.take()?; // NEW let output: SomeStruct = reflect_deserializer.deserialize(&mut deserializer)?.take()?; ``` Alternatively, if this behavior isn't desired, use the `TypedReflectDeserializer::new_dynamic` and `UntypedReflectDeserializer::new_dynamic` methods instead: ```rust // OLD let reflect_deserializer = UntypedReflectDeserializer::new(&registry); // NEW let reflect_deserializer = UntypedReflectDeserializer::new_dynamic(&registry); ``` </details> --------- Co-authored-by: Carter Anderson <mcanders1@gmail.com>	2023-06-29 01:31:34 +00:00
radiish	e17fc53aa1	reflect: avoid deadlock in GenericTypeCell (#8957) ... # Objective - There was a deadlock discovered in the implementation of `bevy_reflect::utility::GenericTypeCell`, when called on a recursive type, e.g. `Vec<Vec<VariableCurve>>` ## Solution - Drop the lock before calling the initialisation function, and then pick it up again afterwards. ## Additional Context - [Discussed on Discord](https://discord.com/channels/691052431525675048/1002362493634629796/1122706835284185108)	2023-06-27 18:07:49 +00:00
Giacomo Stevanato	0f4d16aa3c	Don't ignore additional entries in UntypedReflectDeserializerVisitor (#7112) ... # Objective Currently when `UntypedReflectDeserializerVisitor` deserializes a `Box<dyn Reflect>` it only considers the first entry of the map, silently ignoring any additional entries. For example the following RON data: ```json { "f32": 1.23, "u32": 1, } ``` is successfully deserialized as a `f32`, completly ignoring the `"u32": 1` part. ## Solution `UntypedReflectDeserializerVisitor` was changed to check if any other key could be deserialized, and in that case returns an error. --- ## Changelog `UntypedReflectDeserializer` now errors on malformed inputs instead of silently disgarding additional data. ## Migration Guide If you were deserializing `Box<dyn Reflect>` values with multiple entries (i.e. entries other than `"type": { /* fields */ }`) you should remove them or deserialization will fail.	2023-06-26 19:32:27 +00:00
Joaquín León	af4336c501	Reflect UUID (#8905) ... For those who wish to be able to `#[reflect]` stuff using the `Uuid` type I'm very unfamiliar with the codebase, so please tell me if I'm missing something	2023-06-21 17:24:32 +00:00
Nicola Papale	23863d526a	Do not require mut on ParsedPath::element_mut (#8891) ... # Objective `ParsedPath` does not need to be mut to access a field of a `Reflect`. Be that access mutable or not. Yet `element_mut` requires a mutable borrow on `self`. ## Solution - Make `element_mut` take a `&self` over a `&mut self`. #8887 fixes this, but this is a major limitation in the API and I'd rather see it merged before 0.11. --- ## Changelog - `ParsedPath::element_mut` and `ParsedPath::reflect_element_mut` now accept a non-mutable `ParsedPath` (only the accessed `Reflect` needs to be mutable)	2023-06-19 15:27:45 +00:00
EliasPrescott	e6b655fb25	adding reflection for Cow<'static, [T]> (#7454) ... # Objective - Implementing reflection for Cow<'static, [T]> - Hopefully fixes #7429 ## Solution - Implementing Reflect, Typed, GetTypeRegistration, and FromReflect for Cow<'static, [T]> --- ## Notes I have not used bevy_reflection much yet, so I may not fully understand all the use cases. This is also my first attempt at contributing, so I would appreciate any feedback or recommendations for changes. I tried to add cases for using Cow<'static, str> and Cow<'static, [u8]> to some of the bevy_reflect tests, but I can't guarantee those tests are comprehensive enough. --------- Co-authored-by: MinerSebas <66798382+MinerSebas@users.noreply.github.com> Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>	2023-06-19 14:58:49 +00:00
Thierry Berger	b559e9b6b4	bevy_reflect: implement Reflect for SmolStr (#8771) ... # Objective To upgrade winit's dependency, it's useful to reuse SmolStr, which replaces/improves the too restrictive Key letter enums. As Input<Key> is a resource it should implement Reflect through all its fields. ## Solution Add smol_str to bevy_reflect supported types, behind a feature flag. This PR blocks winit's upgrade PR: https://github.com/bevyengine/bevy/pull/8745. # Current state - I'm discovering bevy_reflect, I appreciate all feedbacks, and send me your nitpicks! - Lacking more tests --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> Co-authored-by: Gino Valente <49806985+MrGVSV@users.noreply.github.com>	2023-06-08 20:33:21 +00:00
Carter Anderson	8b9d88f4d0	Reflect now requires DynamicTypePath. Remove Reflect::get_type_path() (#8764) ... Followup to #7184 This makes `Reflect: DynamicTypePath` which allows us to remove `Reflect::get_type_path`, reducing unnecessary codegen and simplifying `Reflect` implementations.	2023-06-06 17:23:58 +00:00
Jamie Ridding	1e97c79ec1	bevy_reflect: Disambiguate type bounds in where clauses. (#8761) ... # Objective It was accidentally found that rustc is unable to parse certain constructs in `where` clauses properly. `bevy_reflect::Reflect`'s habit of copying and pasting the field types in a type's definition to its `where` clauses made it very easy to accidentally run into this behaviour - particularly with the construct ```rust where for<'a> fn(&'a T) -> &'a T: Trait1 + Trait2 ``` which was incorrectly parsed as ```rust where for<'a> (fn(&'a T) -> &'a T: Trait1 + Trait2) ^ ^ incorrect syntax grouping ``` instead of ```rust where (for<'a> fn(&'a T) -> &'a T): Trait1 + Trait2 ^ ^ correct syntax grouping ``` Fixes #8759 ## Solution This commit fixes the issue by inserting explicit parentheses to disambiguate types from their bound lists.	2023-06-05 22:47:08 +00:00
radiish	1efc762924	reflect: stable type path v2 (#7184) ... # Objective - Introduce a stable alternative to [`std::any::type_name`](https://doc.rust-lang.org/std/any/fn.type_name.html). - Rewrite of #5805 with heavy inspiration in design. - On the path to #5830. - Part of solving #3327. ## Solution - Add a `TypePath` trait for static stable type path/name information. - Add a `TypePath` derive macro. - Add a `impl_type_path` macro for implementing internal and foreign types in `bevy_reflect`. --- ## Changelog - Added `TypePath` trait. - Added `DynamicTypePath` trait and `get_type_path` method to `Reflect`. - Added a `TypePath` derive macro. - Added a `bevy_reflect::impl_type_path` for implementing `TypePath` on internal and foreign types in `bevy_reflect`. - Changed `bevy_reflect::utility::(Non)GenericTypeInfoCell` to `(Non)GenericTypedCell<T>` which allows us to be generic over both `TypeInfo` and `TypePath`. - `TypePath` is now a supertrait of `Asset`, `Material` and `Material2d`. - `impl_reflect_struct` needs a `#[type_path = "..."]` attribute to be specified. - `impl_reflect_value` needs to either specify path starting with a double colon (`::core::option::Option`) or an `in my_crate::foo` declaration. - Added `bevy_reflect_derive::ReflectTypePath`. - Most uses of `Ident` in `bevy_reflect_derive` changed to use `ReflectTypePath`. ## Migration Guide - Implementors of `Asset`, `Material` and `Material2d` now also need to derive `TypePath`. - Manual implementors of `Reflect` will need to implement the new `get_type_path` method. ## Open Questions - [x] ~This PR currently does not migrate any usages of `std::any::type_name` to use `bevy_reflect::TypePath` to ease the review process. Should it?~ Migration will be left to a follow-up PR. - [ ] This PR adds a lot of `#[derive(TypePath)]` and `T: TypePath` to satisfy new bounds, mostly when deriving `TypeUuid`. Should we make `TypePath` a supertrait of `TypeUuid`? [Should we remove `TypeUuid` in favour of `TypePath`?](2afbd85532 (r961067892))	2023-06-05 20:31:20 +00:00
Егор Куклин	6b4c7d5d88	Add get_at_mut to bevy_reflect::Map trait (#8691) ... # Objective Fixes #8596 ## Solution Change interface of the trait Map. Adjust implementations of this trait --- ## Changelog ### Changed - Interface of Map trait ### Added - `Map::get_at_mut` ## Migration Guide Every implementor of Map trait would need to implement `get_at_mut`. Which, judging by changes in this PR, should be fairly trivial.	2023-06-02 12:24:40 +00:00
Gauthier Acquitter	acf1362b9a	bevy_reflect: Allow construction of MapIter outside of the bevy_reflect crate. (#8723) ... # Objective Right now it's impossible to construct a MapIter outside of the bevy_reflect crate, making it impossible to implement the Map trait for custom map types. ## Solution Addition of a pub constructor to MapIter.	2023-06-01 10:12:57 +00:00
Gino Valente	6b292d4263	bevy_reflect: Allow #[reflect(default)] on enum variant fields (#8514) ... # Objective When using `FromReflect`, fields can be optionally left out if they are marked with `#[reflect(default)]`. This is very handy for working with serialized data as giant structs only need to list a subset of defined fields in order to be constructed. <details> <summary>Example</summary> Take the following struct: ```rust #[derive(Reflect, FromReflect)] struct Foo { #[reflect(default)] a: usize, #[reflect(default)] b: usize, #[reflect(default)] c: usize, #[reflect(default)] d: usize, } ``` Since all the fields are default-able, we can successfully call `FromReflect` on deserialized data like: ```rust ( "foo::Foo": ( // Only set `b` and default the rest b: 123 ) ) ``` </details> Unfortunately, this does not work with fields in enum variants. Marking a variant field as `#[reflect(default)]` does nothing when calling `FromReflect`. ## Solution Allow enum variant fields to define a default value using `#[reflect(default)]`. ### `#[reflect(Default)]` One thing that structs and tuple structs can do is use their `Default` implementation when calling `FromReflect`. Adding `#[reflect(Default)]` to the struct or tuple struct both registers `ReflectDefault` and alters the `FromReflect` implementation to use `Default` to generate any missing fields. This works well enough for structs and tuple structs, but for enums it's not as simple. Since the `Default` implementation for an enum only covers a single variant, it's not as intuitive as to what the behavior will be. And (imo) it feels weird that we would be able to specify default values in this way for one variant but not the others. Because of this, I chose to not implement that behavior here. However, I'm open to adding it in if anyone feels otherwise. --- ## Changelog - Allow enum variant fields to define a default value using `#[reflect(default)]`	2023-05-29 15:29:29 +00:00
François	0736195a1e	update syn, encase, glam and hexasphere (#8573) ... # Objective - Fixes #8282 - Update `syn` to 2.0, `encase` to 0.6, `glam` to 0.24 and `hexasphere` to 9.0 Blocked ~~on https://github.com/teoxoy/encase/pull/42~~ and ~~on https://github.com/OptimisticPeach/hexasphere/pull/17~~ --------- Co-authored-by: Nicola Papale <nicopap@users.noreply.github.com> Co-authored-by: JoJoJet <21144246+JoJoJet@users.noreply.github.com>	2023-05-16 01:24:17 +00:00
Mincho Paskalev	fe57b9f744	Add Reflect and FromReflect for AssetPath (#8531) ... # Objective - Add Reflect and FromReflect for AssetPath - Fixes #8458 ## Solution - Straightforward derive of `Reflect` and `FromReflect` for `AssetPath` - Implement `Reflect` and `FromReflect` for `Cow<'static, Path>` as to satisfy the 'static lifetime requierments of bevy_reflect. Implementation is a direct copy of that for `Cow<'static, str>` so maybe it begs the question that was already asked in #7429 - maybe it would be benefitial to write a general implementation for `Reflect` for `Cow<'static, T>`.	2023-05-08 19:19:19 +00:00
Gino Valente	75130bd5ec	bevy_reflect: Better proxies (#6971) ... # Objective > This PR is based on discussion from #6601 The Dynamic types (e.g. `DynamicStruct`, `DynamicList`, etc.) act as both: 1. Dynamic containers which may hold any arbitrary data 2. Proxy types which may represent any other type Currently, the only way we can represent the proxy-ness of a Dynamic is by giving it a name. ```rust // This is just a dynamic container let mut data = DynamicStruct::default(); // This is a "proxy" data.set_name(std::any::type_name::<Foo>()); ``` This type name is the only way we check that the given Dynamic is a proxy of some other type. When we need to "assert the type" of a `dyn Reflect`, we call `Reflect::type_name` on it. However, because we're only using a string to denote the type, we run into a few gotchas and limitations. For example, hashing a Dynamic proxy may work differently than the type it proxies: ```rust #[derive(Reflect, Hash)] #[reflect(Hash)] struct Foo(i32); let concrete = Foo(123); let dynamic = concrete.clone_dynamic(); let concrete_hash = concrete.reflect_hash(); let dynamic_hash = dynamic.reflect_hash(); // The hashes are not equal because `concrete` uses its own `Hash` impl // while `dynamic` uses a reflection-based hashing algorithm assert_ne!(concrete_hash, dynamic_hash); ``` Because the Dynamic proxy only knows about the name of the type, it's unaware of any other information about it. This means it also differs on `Reflect::reflect_partial_eq`, and may include ignored or skipped fields in places the concrete type wouldn't. ## Solution Rather than having Dynamics pass along just the type name of proxied types, we can instead have them pass around the `TypeInfo`. Now all Dynamic types contain an `Option<&'static TypeInfo>` rather than a `String`: ```diff pub struct DynamicTupleStruct { - type_name: String, + represented_type: Option<&'static TypeInfo>, fields: Vec<Box<dyn Reflect>>, } ``` By changing `Reflect::get_type_info` to `Reflect::represented_type_info`, hopefully we make this behavior a little clearer. And to account for `None` values on these dynamic types, `Reflect::represented_type_info` now returns `Option<&'static TypeInfo>`. ```rust let mut data = DynamicTupleStruct::default(); // Not proxying any specific type assert!(dyn_tuple_struct.represented_type_info().is_none()); let type_info = <Foo as Typed>::type_info(); dyn_tuple_struct.set_represented_type(Some(type_info)); // Alternatively: // let dyn_tuple_struct = foo.clone_dynamic(); // Now we're proxying `Foo` assert!(dyn_tuple_struct.represented_type_info().is_some()); ``` This means that we can have full access to all the static type information for the proxied type. Future work would include transitioning more static type information (trait impls, attributes, etc.) over to the `TypeInfo` so it can actually be utilized by Dynamic proxies. ### Alternatives & Rationale > **Note** > These alternatives were written when this PR was first made using a `Proxy` trait. This trait has since been removed. <details> <summary>View</summary> #### Alternative: The `Proxy<T>` Approach I had considered adding something like a `Proxy<T>` type where `T` would be the Dynamic and would contain the proxied type information. This was nice in that it allows us to explicitly determine whether something is a proxy or not at a type level. `Proxy<DynamicStruct>` proxies a struct. Makes sense. The reason I didn't go with this approach is because (1) tuples, (2) complexity, and (3) `PartialReflect`. The `DynamicTuple` struct allows us to represent tuples at runtime. It also allows us to do something you normally can't with tuples: add new fields. Because of this, adding a field immediately invalidates the proxy (e.g. our info for `(i32, i32)` doesn't apply to `(i32, i32, NewField)`). By going with this PR's approach, we can just remove the type info on `DynamicTuple` when that happens. However, with the `Proxy<T>` approach, it becomes difficult to represent this behavior— we'd have to completely control how we access data for `T` for each `T`. Secondly, it introduces some added complexities (aside from the manual impls for each `T`). Does `Proxy<T>` impl `Reflect`? Likely yes, if we want to represent it as `dyn Reflect`. What `TypeInfo` do we give it? How would we forward reflection methods to the inner type (remember, we don't have specialization)? How do we separate this from Dynamic types? And finally, how do all this in a way that's both logical and intuitive for users? Lastly, introducing a `Proxy` trait rather than a `Proxy<T>` struct is actually more inline with the [Unique Reflect RFC](https://github.com/bevyengine/rfcs/pull/56). In a way, the `Proxy` trait is really one part of the `PartialReflect` trait introduced in that RFC (it's technically not in that RFC but it fits well with it), where the `PartialReflect` serves as a way for proxies to work _like_ concrete types without having full access to everything a concrete `Reflect` type can do. This would help bridge the gap between the current state of the crate and the implementation of that RFC. All that said, this is still a viable solution. If the community believes this is the better path forward, then we can do that instead. These were just my reasons for not initially going with it in this PR. #### Alternative: The Type Registry Approach The `Proxy` trait is great and all, but how does it solve the original problem? Well, it doesn't— yet! The goal would be to start moving information from the derive macro and its attributes to the generated `TypeInfo` since these are known statically and shouldn't change. For example, adding `ignored: bool` to `[Un]NamedField` or a list of impls. However, there is another way of storing this information. This is, of course, one of the uses of the `TypeRegistry`. If we're worried about Dynamic proxies not aligning with their concrete counterparts, we could move more type information to the registry and require its usage. For example, we could replace `Reflect::reflect_hash(&self)` with `Reflect::reflect_hash(&self, registry: &TypeRegistry)`. That's not the _worst_ thing in the world, but it is an ergonomics loss. Additionally, other attributes may have their own requirements, further restricting what's possible without the registry. The `Reflect::apply` method will require the registry as well now. Why? Well because the `map_apply` function used for the `Reflect::apply` impls on `Map` types depends on `Map::insert_boxed`, which (at least for `DynamicMap`) requires `Reflect::reflect_hash`. The same would apply when adding support for reflection-based diffing, which will require `Reflect::reflect_partial_eq`. Again, this is a totally viable alternative. I just chose not to go with it for the reasons above. If we want to go with it, then we can close this PR and we can pursue this alternative instead. #### Downsides Just to highlight a quick potential downside (likely needs more investigation): retrieving the `TypeInfo` requires acquiring a lock on the `GenericTypeInfoCell` used by the `Typed` impls for generic types (non-generic types use a `OnceBox which should be faster). I am not sure how much of a performance hit that is and will need to run some benchmarks to compare against. </details> ### Open Questions 1. Should we use `Cow<'static, TypeInfo>` instead? I think that might be easier for modding? Perhaps, in that case, we need to update `Typed::type_info` and friends as well? 2. Are the alternatives better than the approach this PR takes? Are there other alternatives? --- ## Changelog ### Changed - `Reflect::get_type_info` has been renamed to `Reflect::represented_type_info` - This method now returns `Option<&'static TypeInfo>` rather than just `&'static TypeInfo` ### Added - Added `Reflect::is_dynamic` method to indicate when a type is dynamic - Added a `set_represented_type` method on all dynamic types ### Removed - Removed `TypeInfo::Dynamic` (use `Reflect::is_dynamic` instead) - Removed `Typed` impls for all dynamic types ## Migration Guide - The Dynamic types no longer take a string type name. Instead, they require a static reference to `TypeInfo`: ```rust #[derive(Reflect)] struct MyTupleStruct(f32, f32); let mut dyn_tuple_struct = DynamicTupleStruct::default(); dyn_tuple_struct.insert(1.23_f32); dyn_tuple_struct.insert(3.21_f32); // BEFORE: let type_name = std::any::type_name::<MyTupleStruct>(); dyn_tuple_struct.set_name(type_name); // AFTER: let type_info = <MyTupleStruct as Typed>::type_info(); dyn_tuple_struct.set_represented_type(Some(type_info)); ``` - `Reflect::get_type_info` has been renamed to `Reflect::represented_type_info` and now also returns an `Option<&'static TypeInfo>` (instead of just `&'static TypeInfo`): ```rust // BEFORE: let info: &'static TypeInfo = value.get_type_info(); // AFTER: let info: &'static TypeInfo = value.represented_type_info().unwrap(); ``` - `TypeInfo::Dynamic` and `DynamicInfo` has been removed. Use `Reflect::is_dynamic` instead: ```rust // BEFORE: if matches!(value.get_type_info(), TypeInfo::Dynamic) { // ... } // AFTER: if value.is_dynamic() { // ... } ``` --------- Co-authored-by: radiish <cb.setho@gmail.com>	2023-04-26 12:17:46 +00:00
Gino Valente	74d425263a	bevy_reflect: Add ReflectFromReflect to the prelude (#8496) ... # Objective Considering that `FromReflect` is a very common trait to derive, it would make sense to include `ReflectFromReflect` in the `bevy_reflect` prelude so users don't need to import it separately. ## Solution Add `ReflectFromReflect` to the prelude.	2023-04-26 12:16:17 +00:00
Wybe Westra	abf12f3b3b	Fixed several missing links in docs. (#8117) ... Links in the api docs are nice. I noticed that there were several places where structs / functions and other things were referenced in the docs, but weren't linked. I added the links where possible / logical. --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> Co-authored-by: François <mockersf@gmail.com>	2023-04-23 17:28:36 +00:00
Noah	a9f766ceb2	Fix Box<dyn Reflect> struct with a hashmap in it panicking when clone_value is called on it (#8184) ... # Objective - Fix the issue described in #8183: Box<dyn Reflect> structs with a hashmap in them will panic when clone_value is called on it - Fixes: #8183 ## Solution - Updates the implementation of Reflect for Hashmaps to make clone_value call from_reflect on the key before inserting it into the new struct	2023-04-22 02:55:53 +00:00