Struct bevy::asset::AssetServer

pub struct AssetServer { /* private fields */ }

Loads and tracks the state of Asset values from a configured AssetReader. This can be used to kick off new asset loads and retrieve their current load states.

The general process to load an asset is:

1. Initialize a new Asset type with the AssetServer via AssetApp::init_asset, which will internally call AssetServer::register_asset and set up related ECS Assets storage and systems.
2. Register one or more AssetLoaders for that asset with AssetApp::init_asset_loader
3. Add the asset to your asset folder (defaults to assets).
4. Call AssetServer::load with a path to your asset.

AssetServer can be cloned. It is backed by an Arc so clones will share state. Clones can be freely used in parallel.

Implementations

impl AssetServer

pub fn new( sources: AssetSources, mode: AssetServerMode, watching_for_changes: bool ) -> AssetServer

Create a new instance of AssetServer. If watch_for_changes is true, the AssetReader storage will watch for changes to asset sources and hot-reload them.

pub fn get_source<'a>( &'a self, source: impl Into<AssetSourceId<'a>> ) -> Result<&'a AssetSource, MissingAssetSourceError>

Retrieves the AssetReader for the given source.

pub fn register_loader<L>(&self, loader: L)where L: AssetLoader,

Registers a new AssetLoader. AssetLoaders must be registered before they can be used.

pub fn register_asset<A>(&self, assets: &Assets<A>)where A: Asset,

Registers a new Asset type. Asset types must be registered before assets of that type can be loaded.

pub async fn get_asset_loader_with_extension( &self, extension: &str ) -> Result<Arc<dyn ErasedAssetLoader>, MissingAssetLoaderForExtensionError>

Returns the registered AssetLoader associated with the given extension, if it exists.

pub async fn get_asset_loader_with_type_name( &self, type_name: &str ) -> Result<Arc<dyn ErasedAssetLoader>, MissingAssetLoaderForTypeNameError>

Returns the registered AssetLoader associated with the given std::any::type_name, if it exists.

pub async fn get_path_asset_loader<'a>( &self, path: impl Into<AssetPath<'a>> ) -> Result<Arc<dyn ErasedAssetLoader>, MissingAssetLoaderForExtensionError>

Retrieves the default AssetLoader for the given path, if one can be found.

pub fn load<'a, A>(&self, path: impl Into<AssetPath<'a>>) -> Handle<A>where A: Asset,

Begins loading an Asset of type A stored at path. This will not block on the asset load. Instead, it returns a “strong” Handle. When the Asset is loaded (and enters LoadState::Loaded), it will be added to the associated Assets resource.

You can check the asset’s load state by reading AssetEvent events, calling AssetServer::load_state, or checking the Assets storage to see if the Asset exists yet.

The asset load will fail and an error will be printed to the logs if the asset stored at path is not of type A.

pub fn load_with_settings<'a, A, S>( &self, path: impl Into<AssetPath<'a>>, settings: impl Fn(&mut S) + Send + Sync + 'static ) -> Handle<A>where A: Asset, S: Settings,

Begins loading an Asset of type A stored at path. The given settings function will override the asset’s AssetLoader settings. The type S must match the configured AssetLoader::Settings or settings changes will be ignored and an error will be printed to the log.

pub fn load_untyped<'a>( &self, path: impl Into<AssetPath<'a>> ) -> Handle<LoadedUntypedAsset>

Load an asset without knowing it’s type. The method returns a handle to a LoadedUntypedAsset.

Once the LoadedUntypedAsset is loaded, an untyped handle for the requested path can be retrieved from it.

use bevy_asset::{Assets, Handle, LoadedUntypedAsset};
use bevy_ecs::system::{Res, Resource};

#[derive(Resource)]
struct LoadingUntypedHandle(Handle<LoadedUntypedAsset>);

fn resolve_loaded_untyped_handle(loading_handle: Res<LoadingUntypedHandle>, loaded_untyped_assets: Res<Assets<LoadedUntypedAsset>>) {
    if let Some(loaded_untyped_asset) = loaded_untyped_assets.get(&loading_handle.0) {
        let handle = loaded_untyped_asset.handle.clone();
        // continue working with `handle` which points to the asset at the originally requested path
    }
}

This indirection enables a non blocking load of an untyped asset, since I/O is required to figure out the asset type before a handle can be created.

pub fn reload<'a>(&self, path: impl Into<AssetPath<'a>>)

Kicks off a reload of the asset stored at the given path. This will only reload the asset if it currently loaded.

pub fn add<A>(&self, asset: A) -> Handle<A>where A: Asset,

Queues a new asset to be tracked by the AssetServer and returns a Handle to it. This can be used to track dependencies of assets created at runtime.

After the asset has been fully loaded by the AssetServer, it will show up in the relevant Assets storage.

pub fn load_folder<'a>( &self, path: impl Into<AssetPath<'a>> ) -> Handle<LoadedFolder>

Loads all assets from the specified folder recursively. The LoadedFolder asset (when it loads) will contain handles to all assets in the folder. You can wait for all assets to load by checking the LoadedFolder’s RecursiveDependencyLoadState.

Loading the same folder multiple times will return the same handle. If the file_watcher feature is enabled, LoadedFolder handles will reload when a file in the folder is removed, added or moved. This includes files in subdirectories and moving, adding, or removing complete subdirectories.

pub fn get_load_states( &self, id: impl Into<UntypedAssetId> ) -> Option<(LoadState, DependencyLoadState, RecursiveDependencyLoadState)>

Retrieves all loads states for the given asset id.

pub fn get_load_state(&self, id: impl Into<UntypedAssetId>) -> Option<LoadState>

Retrieves the main LoadState of a given asset id.

pub fn get_recursive_dependency_load_state( &self, id: impl Into<UntypedAssetId> ) -> Option<RecursiveDependencyLoadState>

Retrieves the RecursiveDependencyLoadState of a given asset id.

pub fn load_state(&self, id: impl Into<UntypedAssetId>) -> LoadState

Retrieves the main LoadState of a given asset id.

pub fn recursive_dependency_load_state( &self, id: impl Into<UntypedAssetId> ) -> RecursiveDependencyLoadState

Retrieves the RecursiveDependencyLoadState of a given asset id.

pub fn get_handle<'a, A>( &self, path: impl Into<AssetPath<'a>> ) -> Option<Handle<A>>where A: Asset,

Returns an active handle for the given path, if the asset at the given path has already started loading, or is still “alive”.

pub fn get_id_handle<A>(&self, id: AssetId<A>) -> Option<Handle<A>>where A: Asset,

pub fn get_id_handle_untyped(&self, id: UntypedAssetId) -> Option<UntypedHandle>

pub fn get_handle_untyped<'a>( &self, path: impl Into<AssetPath<'a>> ) -> Option<UntypedHandle>

Returns an active untyped handle for the given path, if the asset at the given path has already started loading, or is still “alive”.

pub fn get_path(&self, id: impl Into<UntypedAssetId>) -> Option<AssetPath<'_>>

Returns the path for the given id, if it has one.

pub fn mode(&self) -> AssetServerMode

Returns the AssetServerMode this server is currently in.

pub fn preregister_loader<L>(&self, extensions: &[&str])where L: AssetLoader,

Pre-register a loader that will later be added.

Assets loaded with matching extensions will be blocked until the real loader is added.

Trait Implementations

impl Clone for AssetServer

fn clone(&self) -> AssetServer

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for AssetServer

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Resource for AssetServerwhere AssetServer: Send + Sync + 'static,