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use crate::{
io::{AssetReaderError, MissingAssetSourceError, MissingProcessedAssetReaderError, Reader},
loader_builders::NestedLoader,
meta::{AssetHash, AssetMeta, AssetMetaDyn, ProcessedInfoMinimal, Settings},
path::AssetPath,
Asset, AssetLoadError, AssetServer, AssetServerMode, Assets, Handle, UntypedAssetId,
UntypedHandle,
};
use bevy_ecs::world::World;
use bevy_utils::{BoxedFuture, ConditionalSendFuture, CowArc, HashMap, HashSet};
use downcast_rs::{impl_downcast, Downcast};
use futures_lite::AsyncReadExt;
use ron::error::SpannedError;
use serde::{Deserialize, Serialize};
use std::{
any::{Any, TypeId},
path::{Path, PathBuf},
};
use thiserror::Error;
/// Loads an [`Asset`] from a given byte [`Reader`]. This can accept [`AssetLoader::Settings`], which configure how the [`Asset`]
/// should be loaded.
pub trait AssetLoader: Send + Sync + 'static {
/// The top level [`Asset`] loaded by this [`AssetLoader`].
type Asset: crate::Asset;
/// The settings type used by this [`AssetLoader`].
type Settings: Settings + Default + Serialize + for<'a> Deserialize<'a>;
/// The type of [error](`std::error::Error`) which could be encountered by this loader.
type Error: Into<Box<dyn std::error::Error + Send + Sync + 'static>>;
/// Asynchronously loads [`AssetLoader::Asset`] (and any other labeled assets) from the bytes provided by [`Reader`].
fn load<'a>(
&'a self,
reader: &'a mut Reader,
settings: &'a Self::Settings,
load_context: &'a mut LoadContext,
) -> impl ConditionalSendFuture<Output = Result<Self::Asset, Self::Error>>;
/// Returns a list of extensions supported by this [`AssetLoader`], without the preceding dot.
/// Note that users of this [`AssetLoader`] may choose to load files with a non-matching extension.
fn extensions(&self) -> &[&str] {
&[]
}
}
/// Provides type-erased access to an [`AssetLoader`].
pub trait ErasedAssetLoader: Send + Sync + 'static {
/// Asynchronously loads the asset(s) from the bytes provided by [`Reader`].
fn load<'a>(
&'a self,
reader: &'a mut Reader,
meta: Box<dyn AssetMetaDyn>,
load_context: LoadContext<'a>,
) -> BoxedFuture<
'a,
Result<ErasedLoadedAsset, Box<dyn std::error::Error + Send + Sync + 'static>>,
>;
/// Returns a list of extensions supported by this asset loader, without the preceding dot.
fn extensions(&self) -> &[&str];
/// Deserializes metadata from the input `meta` bytes into the appropriate type (erased as [`Box<dyn AssetMetaDyn>`]).
fn deserialize_meta(&self, meta: &[u8]) -> Result<Box<dyn AssetMetaDyn>, DeserializeMetaError>;
/// Returns the default meta value for the [`AssetLoader`] (erased as [`Box<dyn AssetMetaDyn>`]).
fn default_meta(&self) -> Box<dyn AssetMetaDyn>;
/// Returns the type name of the [`AssetLoader`].
fn type_name(&self) -> &'static str;
/// Returns the [`TypeId`] of the [`AssetLoader`].
fn type_id(&self) -> TypeId;
/// Returns the type name of the top-level [`Asset`] loaded by the [`AssetLoader`].
fn asset_type_name(&self) -> &'static str;
/// Returns the [`TypeId`] of the top-level [`Asset`] loaded by the [`AssetLoader`].
fn asset_type_id(&self) -> TypeId;
}
impl<L> ErasedAssetLoader for L
where
L: AssetLoader + Send + Sync,
{
/// Processes the asset in an asynchronous closure.
fn load<'a>(
&'a self,
reader: &'a mut Reader,
meta: Box<dyn AssetMetaDyn>,
mut load_context: LoadContext<'a>,
) -> BoxedFuture<
'a,
Result<ErasedLoadedAsset, Box<dyn std::error::Error + Send + Sync + 'static>>,
> {
Box::pin(async move {
let settings = meta
.loader_settings()
.expect("Loader settings should exist")
.downcast_ref::<L::Settings>()
.expect("AssetLoader settings should match the loader type");
let asset = <L as AssetLoader>::load(self, reader, settings, &mut load_context)
.await
.map_err(|error| error.into())?;
Ok(load_context.finish(asset, Some(meta)).into())
})
}
fn extensions(&self) -> &[&str] {
<L as AssetLoader>::extensions(self)
}
fn deserialize_meta(&self, meta: &[u8]) -> Result<Box<dyn AssetMetaDyn>, DeserializeMetaError> {
let meta = AssetMeta::<L, ()>::deserialize(meta)?;
Ok(Box::new(meta))
}
fn default_meta(&self) -> Box<dyn AssetMetaDyn> {
Box::new(AssetMeta::<L, ()>::new(crate::meta::AssetAction::Load {
loader: self.type_name().to_string(),
settings: L::Settings::default(),
}))
}
fn type_name(&self) -> &'static str {
std::any::type_name::<L>()
}
fn type_id(&self) -> TypeId {
TypeId::of::<L>()
}
fn asset_type_name(&self) -> &'static str {
std::any::type_name::<L::Asset>()
}
fn asset_type_id(&self) -> TypeId {
TypeId::of::<L::Asset>()
}
}
pub(crate) struct LabeledAsset {
pub(crate) asset: ErasedLoadedAsset,
pub(crate) handle: UntypedHandle,
}
/// The successful result of an [`AssetLoader::load`] call. This contains the loaded "root" asset and any other "labeled" assets produced
/// by the loader. It also holds the input [`AssetMeta`] (if it exists) and tracks dependencies:
/// * normal dependencies: dependencies that must be loaded as part of this asset load (ex: assets a given asset has handles to).
/// * Loader dependencies: dependencies whose actual asset values are used during the load process
pub struct LoadedAsset<A: Asset> {
pub(crate) value: A,
pub(crate) dependencies: HashSet<UntypedAssetId>,
pub(crate) loader_dependencies: HashMap<AssetPath<'static>, AssetHash>,
pub(crate) labeled_assets: HashMap<CowArc<'static, str>, LabeledAsset>,
pub(crate) meta: Option<Box<dyn AssetMetaDyn>>,
}
impl<A: Asset> LoadedAsset<A> {
/// Create a new loaded asset. This will use [`VisitAssetDependencies`](crate::VisitAssetDependencies) to populate `dependencies`.
pub fn new_with_dependencies(value: A, meta: Option<Box<dyn AssetMetaDyn>>) -> Self {
let mut dependencies = HashSet::new();
value.visit_dependencies(&mut |id| {
dependencies.insert(id);
});
LoadedAsset {
value,
dependencies,
loader_dependencies: HashMap::default(),
labeled_assets: HashMap::default(),
meta,
}
}
/// Cast (and take ownership) of the [`Asset`] value of the given type.
pub fn take(self) -> A {
self.value
}
/// Retrieves a reference to the internal [`Asset`] type.
pub fn get(&self) -> &A {
&self.value
}
/// Returns the [`ErasedLoadedAsset`] for the given label, if it exists.
pub fn get_labeled(
&self,
label: impl Into<CowArc<'static, str>>,
) -> Option<&ErasedLoadedAsset> {
self.labeled_assets.get(&label.into()).map(|a| &a.asset)
}
/// Iterate over all labels for "labeled assets" in the loaded asset
pub fn iter_labels(&self) -> impl Iterator<Item = &str> {
self.labeled_assets.keys().map(|s| &**s)
}
}
impl<A: Asset> From<A> for LoadedAsset<A> {
fn from(asset: A) -> Self {
LoadedAsset::new_with_dependencies(asset, None)
}
}
/// A "type erased / boxed" counterpart to [`LoadedAsset`]. This is used in places where the loaded type is not statically known.
pub struct ErasedLoadedAsset {
pub(crate) value: Box<dyn AssetContainer>,
pub(crate) dependencies: HashSet<UntypedAssetId>,
pub(crate) loader_dependencies: HashMap<AssetPath<'static>, AssetHash>,
pub(crate) labeled_assets: HashMap<CowArc<'static, str>, LabeledAsset>,
pub(crate) meta: Option<Box<dyn AssetMetaDyn>>,
}
impl<A: Asset> From<LoadedAsset<A>> for ErasedLoadedAsset {
fn from(asset: LoadedAsset<A>) -> Self {
ErasedLoadedAsset {
value: Box::new(asset.value),
dependencies: asset.dependencies,
loader_dependencies: asset.loader_dependencies,
labeled_assets: asset.labeled_assets,
meta: asset.meta,
}
}
}
impl ErasedLoadedAsset {
/// Cast (and take ownership) of the [`Asset`] value of the given type. This will return [`Some`] if
/// the stored type matches `A` and [`None`] if it does not.
pub fn take<A: Asset>(self) -> Option<A> {
self.value.downcast::<A>().map(|a| *a).ok()
}
/// Retrieves a reference to the internal [`Asset`] type, if it matches the type `A`. Otherwise returns [`None`].
pub fn get<A: Asset>(&self) -> Option<&A> {
self.value.downcast_ref::<A>()
}
/// Retrieves the [`TypeId`] of the stored [`Asset`] type.
pub fn asset_type_id(&self) -> TypeId {
(*self.value).type_id()
}
/// Retrieves the `type_name` of the stored [`Asset`] type.
pub fn asset_type_name(&self) -> &'static str {
self.value.asset_type_name()
}
/// Returns the [`ErasedLoadedAsset`] for the given label, if it exists.
pub fn get_labeled(
&self,
label: impl Into<CowArc<'static, str>>,
) -> Option<&ErasedLoadedAsset> {
self.labeled_assets.get(&label.into()).map(|a| &a.asset)
}
/// Iterate over all labels for "labeled assets" in the loaded asset
pub fn iter_labels(&self) -> impl Iterator<Item = &str> {
self.labeled_assets.keys().map(|s| &**s)
}
/// Cast this loaded asset as the given type. If the type does not match,
/// the original type-erased asset is returned.
#[allow(clippy::result_large_err)]
pub fn downcast<A: Asset>(mut self) -> Result<LoadedAsset<A>, ErasedLoadedAsset> {
match self.value.downcast::<A>() {
Ok(value) => Ok(LoadedAsset {
value: *value,
dependencies: self.dependencies,
loader_dependencies: self.loader_dependencies,
labeled_assets: self.labeled_assets,
meta: self.meta,
}),
Err(value) => {
self.value = value;
Err(self)
}
}
}
}
/// A type erased container for an [`Asset`] value that is capable of inserting the [`Asset`] into a [`World`]'s [`Assets`] collection.
pub trait AssetContainer: Downcast + Any + Send + Sync + 'static {
fn insert(self: Box<Self>, id: UntypedAssetId, world: &mut World);
fn asset_type_name(&self) -> &'static str;
}
impl_downcast!(AssetContainer);
impl<A: Asset> AssetContainer for A {
fn insert(self: Box<Self>, id: UntypedAssetId, world: &mut World) {
world.resource_mut::<Assets<A>>().insert(id.typed(), *self);
}
fn asset_type_name(&self) -> &'static str {
std::any::type_name::<A>()
}
}
/// An error that occurs when attempting to call [`LoadContext::load_direct`]
#[derive(Error, Debug)]
#[error("Failed to load dependency {dependency:?} {error}")]
pub struct LoadDirectError {
pub dependency: AssetPath<'static>,
pub error: AssetLoadError,
}
/// An error that occurs while deserializing [`AssetMeta`].
#[derive(Error, Debug, Clone, PartialEq, Eq)]
pub enum DeserializeMetaError {
#[error("Failed to deserialize asset meta: {0:?}")]
DeserializeSettings(#[from] SpannedError),
#[error("Failed to deserialize minimal asset meta: {0:?}")]
DeserializeMinimal(SpannedError),
}
/// A context that provides access to assets in [`AssetLoader`]s, tracks dependencies, and collects asset load state.
/// Any asset state accessed by [`LoadContext`] will be tracked and stored for use in dependency events and asset preprocessing.
pub struct LoadContext<'a> {
pub(crate) asset_server: &'a AssetServer,
pub(crate) should_load_dependencies: bool,
populate_hashes: bool,
asset_path: AssetPath<'static>,
pub(crate) dependencies: HashSet<UntypedAssetId>,
/// Direct dependencies used by this loader.
pub(crate) loader_dependencies: HashMap<AssetPath<'static>, AssetHash>,
pub(crate) labeled_assets: HashMap<CowArc<'static, str>, LabeledAsset>,
}
impl<'a> LoadContext<'a> {
/// Creates a new [`LoadContext`] instance.
pub(crate) fn new(
asset_server: &'a AssetServer,
asset_path: AssetPath<'static>,
should_load_dependencies: bool,
populate_hashes: bool,
) -> Self {
Self {
asset_server,
asset_path,
populate_hashes,
should_load_dependencies,
dependencies: HashSet::default(),
loader_dependencies: HashMap::default(),
labeled_assets: HashMap::default(),
}
}
/// Begins a new labeled asset load. Use the returned [`LoadContext`] to load
/// dependencies for the new asset and call [`LoadContext::finish`] to finalize the asset load.
/// When finished, make sure you call [`LoadContext::add_labeled_asset`] to add the results back to the parent
/// context.
/// Prefer [`LoadContext::labeled_asset_scope`] when possible, which will automatically add
/// the labeled [`LoadContext`] back to the parent context.
/// [`LoadContext::begin_labeled_asset`] exists largely to enable parallel asset loading.
///
/// See [`AssetPath`] for more on labeled assets.
///
/// ```no_run
/// # use bevy_asset::{Asset, LoadContext};
/// # use bevy_reflect::TypePath;
/// # #[derive(Asset, TypePath, Default)]
/// # struct Image;
/// # let load_context: LoadContext = panic!();
/// let mut handles = Vec::new();
/// for i in 0..2 {
/// let mut labeled = load_context.begin_labeled_asset();
/// handles.push(std::thread::spawn(move || {
/// (i.to_string(), labeled.finish(Image::default(), None))
/// }));
/// }
/// for handle in handles {
/// let (label, loaded_asset) = handle.join().unwrap();
/// load_context.add_loaded_labeled_asset(label, loaded_asset);
/// }
/// ```
pub fn begin_labeled_asset(&self) -> LoadContext {
LoadContext::new(
self.asset_server,
self.asset_path.clone(),
self.should_load_dependencies,
self.populate_hashes,
)
}
/// Creates a new [`LoadContext`] for the given `label`. The `load` function is responsible for loading an [`Asset`] of
/// type `A`. `load` will be called immediately and the result will be used to finalize the [`LoadContext`], resulting in a new
/// [`LoadedAsset`], which is registered under the `label` label.
///
/// This exists to remove the need to manually call [`LoadContext::begin_labeled_asset`] and then manually register the
/// result with [`LoadContext::add_labeled_asset`].
///
/// See [`AssetPath`] for more on labeled assets.
pub fn labeled_asset_scope<A: Asset>(
&mut self,
label: String,
load: impl FnOnce(&mut LoadContext) -> A,
) -> Handle<A> {
let mut context = self.begin_labeled_asset();
let asset = load(&mut context);
let loaded_asset = context.finish(asset, None);
self.add_loaded_labeled_asset(label, loaded_asset)
}
/// This will add the given `asset` as a "labeled [`Asset`]" with the `label` label.
///
/// # Warning
///
/// This will not assign dependencies to the given `asset`. If adding an asset
/// with dependencies generated from calls such as [`LoadContext::load`], use
/// [`LoadContext::labeled_asset_scope`] or [`LoadContext::begin_labeled_asset`] to generate a
/// new [`LoadContext`] to track the dependencies for the labeled asset.
///
/// See [`AssetPath`] for more on labeled assets.
pub fn add_labeled_asset<A: Asset>(&mut self, label: String, asset: A) -> Handle<A> {
self.labeled_asset_scope(label, |_| asset)
}
/// Add a [`LoadedAsset`] that is a "labeled sub asset" of the root path of this load context.
/// This can be used in combination with [`LoadContext::begin_labeled_asset`] to parallelize
/// sub asset loading.
///
/// See [`AssetPath`] for more on labeled assets.
pub fn add_loaded_labeled_asset<A: Asset>(
&mut self,
label: impl Into<CowArc<'static, str>>,
loaded_asset: LoadedAsset<A>,
) -> Handle<A> {
let label = label.into();
let loaded_asset: ErasedLoadedAsset = loaded_asset.into();
let labeled_path = self.asset_path.clone().with_label(label.clone());
let handle = self
.asset_server
.get_or_create_path_handle(labeled_path, None);
self.labeled_assets.insert(
label,
LabeledAsset {
asset: loaded_asset,
handle: handle.clone().untyped(),
},
);
handle
}
/// Returns `true` if an asset with the label `label` exists in this context.
///
/// See [`AssetPath`] for more on labeled assets.
pub fn has_labeled_asset<'b>(&self, label: impl Into<CowArc<'b, str>>) -> bool {
let path = self.asset_path.clone().with_label(label.into());
!self.asset_server.get_handles_untyped(&path).is_empty()
}
/// "Finishes" this context by populating the final [`Asset`] value (and the erased [`AssetMeta`] value, if it exists).
/// The relevant asset metadata collected in this context will be stored in the returned [`LoadedAsset`].
pub fn finish<A: Asset>(self, value: A, meta: Option<Box<dyn AssetMetaDyn>>) -> LoadedAsset<A> {
LoadedAsset {
value,
dependencies: self.dependencies,
loader_dependencies: self.loader_dependencies,
labeled_assets: self.labeled_assets,
meta,
}
}
/// Gets the source path for this load context.
pub fn path(&self) -> &Path {
self.asset_path.path()
}
/// Gets the source asset path for this load context.
pub fn asset_path(&self) -> &AssetPath<'static> {
&self.asset_path
}
/// Reads the asset at the given path and returns its bytes
pub async fn read_asset_bytes<'b, 'c>(
&'b mut self,
path: impl Into<AssetPath<'c>>,
) -> Result<Vec<u8>, ReadAssetBytesError> {
let path = path.into();
let source = self.asset_server.get_source(path.source())?;
let asset_reader = match self.asset_server.mode() {
AssetServerMode::Unprocessed { .. } => source.reader(),
AssetServerMode::Processed { .. } => source.processed_reader()?,
};
let mut reader = asset_reader.read(path.path()).await?;
let hash = if self.populate_hashes {
// NOTE: ensure meta is read while the asset bytes reader is still active to ensure transactionality
// See `ProcessorGatedReader` for more info
let meta_bytes = asset_reader.read_meta_bytes(path.path()).await?;
let minimal: ProcessedInfoMinimal = ron::de::from_bytes(&meta_bytes)
.map_err(DeserializeMetaError::DeserializeMinimal)?;
let processed_info = minimal
.processed_info
.ok_or(ReadAssetBytesError::MissingAssetHash)?;
processed_info.full_hash
} else {
Default::default()
};
let mut bytes = Vec::new();
reader
.read_to_end(&mut bytes)
.await
.map_err(|source| ReadAssetBytesError::Io {
path: path.path().to_path_buf(),
source,
})?;
self.loader_dependencies.insert(path.clone_owned(), hash);
Ok(bytes)
}
/// Returns a handle to an asset of type `A` with the label `label`. This [`LoadContext`] must produce an asset of the
/// given type and the given label or the dependencies of this asset will never be considered "fully loaded". However you
/// can call this method before _or_ after adding the labeled asset.
pub fn get_label_handle<'b, A: Asset>(
&mut self,
label: impl Into<CowArc<'b, str>>,
) -> Handle<A> {
let path = self.asset_path.clone().with_label(label);
let handle = self.asset_server.get_or_create_path_handle::<A>(path, None);
self.dependencies.insert(handle.id().untyped());
handle
}
pub(crate) async fn load_direct_internal(
&mut self,
path: AssetPath<'static>,
meta: Box<dyn AssetMetaDyn>,
loader: &dyn ErasedAssetLoader,
reader: &mut Reader<'_>,
) -> Result<ErasedLoadedAsset, LoadDirectError> {
let loaded_asset = self
.asset_server
.load_with_meta_loader_and_reader(
&path,
meta,
loader,
reader,
false,
self.populate_hashes,
)
.await
.map_err(|error| LoadDirectError {
dependency: path.clone(),
error,
})?;
let info = loaded_asset
.meta
.as_ref()
.and_then(|m| m.processed_info().as_ref());
let hash = info.map(|i| i.full_hash).unwrap_or(Default::default());
self.loader_dependencies.insert(path, hash);
Ok(loaded_asset)
}
/// Create a builder for loading nested assets in this context.
#[must_use]
pub fn loader(&mut self) -> NestedLoader<'a, '_> {
NestedLoader::new(self)
}
/// Retrieves a handle for the asset at the given path and adds that path as a dependency of the asset.
/// If the current context is a normal [`AssetServer::load`], an actual asset load will be kicked off immediately, which ensures the load happens
/// as soon as possible.
/// "Normal loads" kicked from within a normal Bevy App will generally configure the context to kick off loads immediately.
/// If the current context is configured to not load dependencies automatically (ex: [`AssetProcessor`](crate::processor::AssetProcessor)),
/// a load will not be kicked off automatically. It is then the calling context's responsibility to begin a load if necessary.
///
/// If you need to override asset settings, asset type, or load directly, please see [`LoadContext::loader`].
pub fn load<'b, A: Asset>(&mut self, path: impl Into<AssetPath<'b>>) -> Handle<A> {
self.loader().load(path)
}
}
/// An error produced when calling [`LoadContext::read_asset_bytes`]
#[derive(Error, Debug)]
pub enum ReadAssetBytesError {
#[error(transparent)]
DeserializeMetaError(#[from] DeserializeMetaError),
#[error(transparent)]
AssetReaderError(#[from] AssetReaderError),
#[error(transparent)]
MissingAssetSourceError(#[from] MissingAssetSourceError),
#[error(transparent)]
MissingProcessedAssetReaderError(#[from] MissingProcessedAssetReaderError),
/// Encountered an I/O error while loading an asset.
#[error("Encountered an io error while loading asset at `{path}`: {source}")]
Io {
path: PathBuf,
#[source]
source: std::io::Error,
},
#[error("The LoadContext for this read_asset_bytes call requires hash metadata, but it was not provided. This is likely an internal implementation error.")]
MissingAssetHash,
}