93 lines
3.1 KiB
Rust
93 lines
3.1 KiB
Rust
//! Implements a custom asset io loader.
|
|
//! An [`AssetIo`] is what the asset server uses to read the raw bytes of assets.
|
|
//! It does not know anything about the asset formats, only how to talk to the underlying storage.
|
|
|
|
use bevy::{
|
|
asset::{AssetIo, AssetIoError, Metadata},
|
|
prelude::*,
|
|
utils::BoxedFuture,
|
|
};
|
|
use std::path::{Path, PathBuf};
|
|
|
|
/// A custom asset io implementation that simply defers to the platform default
|
|
/// implementation.
|
|
///
|
|
/// This can be used as a starting point for developing a useful implementation
|
|
/// that can defer to the default when needed.
|
|
struct CustomAssetIo(Box<dyn AssetIo>);
|
|
|
|
impl AssetIo for CustomAssetIo {
|
|
fn load_path<'a>(&'a self, path: &'a Path) -> BoxedFuture<'a, Result<Vec<u8>, AssetIoError>> {
|
|
info!("load_path({path:?})");
|
|
self.0.load_path(path)
|
|
}
|
|
|
|
fn read_directory(
|
|
&self,
|
|
path: &Path,
|
|
) -> Result<Box<dyn Iterator<Item = PathBuf>>, AssetIoError> {
|
|
info!("read_directory({path:?})");
|
|
self.0.read_directory(path)
|
|
}
|
|
|
|
fn watch_path_for_changes(
|
|
&self,
|
|
to_watch: &Path,
|
|
to_reload: Option<PathBuf>,
|
|
) -> Result<(), AssetIoError> {
|
|
info!("watch_path_for_changes({to_watch:?}, {to_reload:?})");
|
|
self.0.watch_path_for_changes(to_watch, to_reload)
|
|
}
|
|
|
|
fn watch_for_changes(&self) -> Result<(), AssetIoError> {
|
|
info!("watch_for_changes()");
|
|
self.0.watch_for_changes()
|
|
}
|
|
|
|
fn get_metadata(&self, path: &Path) -> Result<Metadata, AssetIoError> {
|
|
info!("get_metadata({path:?})");
|
|
self.0.get_metadata(path)
|
|
}
|
|
}
|
|
|
|
/// A plugin used to execute the override of the asset io
|
|
struct CustomAssetIoPlugin;
|
|
|
|
impl Plugin for CustomAssetIoPlugin {
|
|
fn build(&self, app: &mut App) {
|
|
let default_io = AssetPlugin::default().create_platform_default_asset_io();
|
|
|
|
// create the custom asset io instance
|
|
let asset_io = CustomAssetIo(default_io);
|
|
|
|
// the asset server is constructed and added the resource manager
|
|
app.insert_resource(AssetServer::new(asset_io));
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(
|
|
DefaultPlugins
|
|
.build()
|
|
// the custom asset io plugin must be inserted in-between the
|
|
// `CorePlugin' and `AssetPlugin`. It needs to be after the
|
|
// CorePlugin, so that the IO task pool has already been constructed.
|
|
// And it must be before the `AssetPlugin` so that the asset plugin
|
|
// doesn't create another instance of an asset server. In general,
|
|
// the AssetPlugin should still run so that other aspects of the
|
|
// asset system are initialized correctly.
|
|
.add_before::<bevy::asset::AssetPlugin, _>(CustomAssetIoPlugin),
|
|
)
|
|
.add_systems(Startup, setup)
|
|
.run();
|
|
}
|
|
|
|
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
|
|
commands.spawn(Camera2dBundle::default());
|
|
commands.spawn(SpriteBundle {
|
|
texture: asset_server.load("branding/icon.png"),
|
|
..default()
|
|
});
|
|
}
|