1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407
#[cfg(feature = "embedded_watcher")]
mod embedded_watcher;
#[cfg(feature = "embedded_watcher")]
pub use embedded_watcher::*;
use crate::io::{
memory::{Dir, MemoryAssetReader, Value},
AssetSource, AssetSourceBuilders,
};
use bevy_ecs::system::Resource;
use std::path::{Path, PathBuf};
pub const EMBEDDED: &str = "embedded";
/// A [`Resource`] that manages "rust source files" in a virtual in memory [`Dir`], which is intended
/// to be shared with a [`MemoryAssetReader`].
/// Generally this should not be interacted with directly. The [`embedded_asset`] will populate this.
///
/// [`embedded_asset`]: crate::embedded_asset
#[derive(Resource, Default)]
pub struct EmbeddedAssetRegistry {
dir: Dir,
#[cfg(feature = "embedded_watcher")]
root_paths: std::sync::Arc<parking_lot::RwLock<bevy_utils::HashMap<Box<Path>, PathBuf>>>,
}
impl EmbeddedAssetRegistry {
/// Inserts a new asset. `full_path` is the full path (as [`file`] would return for that file, if it was capable of
/// running in a non-rust file). `asset_path` is the path that will be used to identify the asset in the `embedded`
/// [`AssetSource`]. `value` is the bytes that will be returned for the asset. This can be _either_ a `&'static [u8]`
/// or a [`Vec<u8>`].
#[allow(unused)]
pub fn insert_asset(&self, full_path: PathBuf, asset_path: &Path, value: impl Into<Value>) {
#[cfg(feature = "embedded_watcher")]
self.root_paths
.write()
.insert(full_path.into(), asset_path.to_owned());
self.dir.insert_asset(asset_path, value);
}
/// Inserts new asset metadata. `full_path` is the full path (as [`file`] would return for that file, if it was capable of
/// running in a non-rust file). `asset_path` is the path that will be used to identify the asset in the `embedded`
/// [`AssetSource`]. `value` is the bytes that will be returned for the asset. This can be _either_ a `&'static [u8]`
/// or a [`Vec<u8>`].
#[allow(unused)]
pub fn insert_meta(&self, full_path: &Path, asset_path: &Path, value: impl Into<Value>) {
#[cfg(feature = "embedded_watcher")]
self.root_paths
.write()
.insert(full_path.into(), asset_path.to_owned());
self.dir.insert_meta(asset_path, value);
}
/// Registers a `embedded` [`AssetSource`] that uses this [`EmbeddedAssetRegistry`].
// NOTE: unused_mut because embedded_watcher feature is the only mutable consumer of `let mut source`
#[allow(unused_mut)]
pub fn register_source(&self, sources: &mut AssetSourceBuilders) {
let dir = self.dir.clone();
let processed_dir = self.dir.clone();
let mut source = AssetSource::build()
.with_reader(move || Box::new(MemoryAssetReader { root: dir.clone() }))
.with_processed_reader(move || {
Box::new(MemoryAssetReader {
root: processed_dir.clone(),
})
})
// Note that we only add a processed watch warning because we don't want to warn
// noisily about embedded watching (which is niche) when users enable file watching.
.with_processed_watch_warning(
"Consider enabling the `embedded_watcher` cargo feature.",
);
#[cfg(feature = "embedded_watcher")]
{
let root_paths = self.root_paths.clone();
let dir = self.dir.clone();
let processed_root_paths = self.root_paths.clone();
let processd_dir = self.dir.clone();
source = source
.with_watcher(move |sender| {
Some(Box::new(EmbeddedWatcher::new(
dir.clone(),
root_paths.clone(),
sender,
std::time::Duration::from_millis(300),
)))
})
.with_processed_watcher(move |sender| {
Some(Box::new(EmbeddedWatcher::new(
processd_dir.clone(),
processed_root_paths.clone(),
sender,
std::time::Duration::from_millis(300),
)))
});
}
sources.insert(EMBEDDED, source);
}
}
/// Returns the [`Path`] for a given `embedded` asset.
/// This is used internally by [`embedded_asset`] and can be used to get a [`Path`]
/// that matches the [`AssetPath`](crate::AssetPath) used by that asset.
///
/// [`embedded_asset`]: crate::embedded_asset
#[macro_export]
macro_rules! embedded_path {
($path_str: expr) => {{
embedded_path!("src", $path_str)
}};
($source_path: expr, $path_str: expr) => {{
let crate_name = module_path!().split(':').next().unwrap();
$crate::io::embedded::_embedded_asset_path(
crate_name,
$source_path.as_ref(),
file!().as_ref(),
$path_str.as_ref(),
)
}};
}
/// Implementation detail of `embedded_path`, do not use this!
///
/// Returns an embedded asset path, given:
/// - `crate_name`: name of the crate where the asset is embedded
/// - `src_prefix`: path prefix of the crate's source directory, relative to the workspace root
/// - `file_path`: `std::file!()` path of the source file where `embedded_path!` is called
/// - `asset_path`: path of the embedded asset relative to `file_path`
#[doc(hidden)]
pub fn _embedded_asset_path(
crate_name: &str,
src_prefix: &Path,
file_path: &Path,
asset_path: &Path,
) -> PathBuf {
let mut maybe_parent = file_path.parent();
let after_src = loop {
let Some(parent) = maybe_parent else {
panic!("Failed to find src_prefix {src_prefix:?} in {file_path:?}")
};
if parent.ends_with(src_prefix) {
break file_path.strip_prefix(parent).unwrap();
}
maybe_parent = parent.parent();
};
let asset_path = after_src.parent().unwrap().join(asset_path);
Path::new(crate_name).join(asset_path)
}
/// Creates a new `embedded` asset by embedding the bytes of the given path into the current binary
/// and registering those bytes with the `embedded` [`AssetSource`].
///
/// This accepts the current [`App`](bevy_app::App) as the first parameter and a path `&str` (relative to the current file) as the second.
///
/// By default this will generate an [`AssetPath`] using the following rules:
///
/// 1. Search for the first `$crate_name/src/` in the path and trim to the path past that point.
/// 2. Re-add the current `$crate_name` to the front of the path
///
/// For example, consider the following file structure in the theoretical `bevy_rock` crate, which provides a Bevy [`Plugin`](bevy_app::Plugin)
/// that renders fancy rocks for scenes.
///
/// ```text
/// bevy_rock
/// ├── src
/// │ ├── render
/// │ │ ├── rock.wgsl
/// │ │ └── mod.rs
/// │ └── lib.rs
/// └── Cargo.toml
/// ```
///
/// `rock.wgsl` is a WGSL shader asset that the `bevy_rock` plugin author wants to bundle with their crate. They invoke the following
/// in `bevy_rock/src/render/mod.rs`:
///
/// `embedded_asset!(app, "rock.wgsl")`
///
/// `rock.wgsl` can now be loaded by the [`AssetServer`](crate::AssetServer) with the following path:
///
/// ```no_run
/// # use bevy_asset::{Asset, AssetServer};
/// # use bevy_reflect::TypePath;
/// # let asset_server: AssetServer = panic!();
/// # #[derive(Asset, TypePath)]
/// # struct Shader;
/// let shader = asset_server.load::<Shader>("embedded://bevy_rock/render/rock.wgsl");
/// ```
///
/// Some things to note in the path:
/// 1. The non-default `embedded://` [`AssetSource`]
/// 2. `src` is trimmed from the path
///
/// The default behavior also works for cargo workspaces. Pretend the `bevy_rock` crate now exists in a larger workspace in
/// `$SOME_WORKSPACE/crates/bevy_rock`. The asset path would remain the same, because [`embedded_asset`] searches for the
/// _first instance_ of `bevy_rock/src` in the path.
///
/// For most "standard crate structures" the default works just fine. But for some niche cases (such as cargo examples),
/// the `src` path will not be present. You can override this behavior by adding it as the second argument to [`embedded_asset`]:
///
/// `embedded_asset!(app, "/examples/rock_stuff/", "rock.wgsl")`
///
/// When there are three arguments, the second argument will replace the default `/src/` value. Note that these two are
/// equivalent:
///
/// `embedded_asset!(app, "rock.wgsl")`
/// `embedded_asset!(app, "/src/", "rock.wgsl")`
///
/// This macro uses the [`include_bytes`] macro internally and _will not_ reallocate the bytes.
/// Generally the [`AssetPath`] generated will be predictable, but if your asset isn't
/// available for some reason, you can use the [`embedded_path`] macro to debug.
///
/// Hot-reloading `embedded` assets is supported. Just enable the `embedded_watcher` cargo feature.
///
/// [`AssetPath`]: crate::AssetPath
/// [`embedded_asset`]: crate::embedded_asset
/// [`embedded_path`]: crate::embedded_path
#[macro_export]
macro_rules! embedded_asset {
($app: ident, $path: expr) => {{
$crate::embedded_asset!($app, "src", $path)
}};
($app: ident, $source_path: expr, $path: expr) => {{
let mut embedded = $app
.world_mut()
.resource_mut::<$crate::io::embedded::EmbeddedAssetRegistry>();
let path = $crate::embedded_path!($source_path, $path);
let watched_path = $crate::io::embedded::watched_path(file!(), $path);
embedded.insert_asset(watched_path, &path, include_bytes!($path));
}};
}
/// Returns the path used by the watcher.
#[doc(hidden)]
#[cfg(feature = "embedded_watcher")]
pub fn watched_path(source_file_path: &'static str, asset_path: &'static str) -> PathBuf {
PathBuf::from(source_file_path)
.parent()
.unwrap()
.join(asset_path)
}
/// Returns an empty PathBuf.
#[doc(hidden)]
#[cfg(not(feature = "embedded_watcher"))]
pub fn watched_path(_source_file_path: &'static str, _asset_path: &'static str) -> PathBuf {
PathBuf::from("")
}
/// Loads an "internal" asset by embedding the string stored in the given `path_str` and associates it with the given handle.
#[macro_export]
macro_rules! load_internal_asset {
($app: ident, $handle: expr, $path_str: expr, $loader: expr) => {{
let mut assets = $app.world_mut().resource_mut::<$crate::Assets<_>>();
assets.insert($handle.id(), ($loader)(
include_str!($path_str),
std::path::Path::new(file!())
.parent()
.unwrap()
.join($path_str)
.to_string_lossy()
));
}};
// we can't support params without variadic arguments, so internal assets with additional params can't be hot-reloaded
($app: ident, $handle: ident, $path_str: expr, $loader: expr $(, $param:expr)+) => {{
let mut assets = $app.world_mut().resource_mut::<$crate::Assets<_>>();
assets.insert($handle.id(), ($loader)(
include_str!($path_str),
std::path::Path::new(file!())
.parent()
.unwrap()
.join($path_str)
.to_string_lossy(),
$($param),+
));
}};
}
/// Loads an "internal" binary asset by embedding the bytes stored in the given `path_str` and associates it with the given handle.
#[macro_export]
macro_rules! load_internal_binary_asset {
($app: ident, $handle: expr, $path_str: expr, $loader: expr) => {{
let mut assets = $app.world_mut().resource_mut::<$crate::Assets<_>>();
assets.insert(
$handle.id(),
($loader)(
include_bytes!($path_str).as_ref(),
std::path::Path::new(file!())
.parent()
.unwrap()
.join($path_str)
.to_string_lossy()
.into(),
),
);
}};
}
#[cfg(test)]
mod tests {
use super::_embedded_asset_path;
use std::path::Path;
// Relative paths show up if this macro is being invoked by a local crate.
// In this case we know the relative path is a sub- path of the workspace
// root.
#[test]
fn embedded_asset_path_from_local_crate() {
let asset_path = _embedded_asset_path(
"my_crate",
"src".as_ref(),
"src/foo/plugin.rs".as_ref(),
"the/asset.png".as_ref(),
);
assert_eq!(asset_path, Path::new("my_crate/foo/the/asset.png"));
}
// A blank src_path removes the embedded's file path altogether only the
// asset path remains.
#[test]
fn embedded_asset_path_from_local_crate_blank_src_path_questionable() {
let asset_path = _embedded_asset_path(
"my_crate",
"".as_ref(),
"src/foo/some/deep/path/plugin.rs".as_ref(),
"the/asset.png".as_ref(),
);
assert_eq!(asset_path, Path::new("my_crate/the/asset.png"));
}
#[test]
#[should_panic(expected = "Failed to find src_prefix \"NOT-THERE\" in \"src")]
fn embedded_asset_path_from_local_crate_bad_src() {
let _asset_path = _embedded_asset_path(
"my_crate",
"NOT-THERE".as_ref(),
"src/foo/plugin.rs".as_ref(),
"the/asset.png".as_ref(),
);
}
#[test]
fn embedded_asset_path_from_local_example_crate() {
let asset_path = _embedded_asset_path(
"example_name",
"examples/foo".as_ref(),
"examples/foo/example.rs".as_ref(),
"the/asset.png".as_ref(),
);
assert_eq!(asset_path, Path::new("example_name/the/asset.png"));
}
// Absolute paths show up if this macro is being invoked by an external
// dependency, e.g. one that's being checked out from a crates repo or git.
#[test]
fn embedded_asset_path_from_external_crate() {
let asset_path = _embedded_asset_path(
"my_crate",
"src".as_ref(),
"/path/to/crate/src/foo/plugin.rs".as_ref(),
"the/asset.png".as_ref(),
);
assert_eq!(asset_path, Path::new("my_crate/foo/the/asset.png"));
}
#[test]
fn embedded_asset_path_from_external_crate_root_src_path() {
let asset_path = _embedded_asset_path(
"my_crate",
"/path/to/crate/src".as_ref(),
"/path/to/crate/src/foo/plugin.rs".as_ref(),
"the/asset.png".as_ref(),
);
assert_eq!(asset_path, Path::new("my_crate/foo/the/asset.png"));
}
// Although extraneous slashes are permitted at the end, e.g., "src////",
// one or more slashes at the beginning are not.
#[test]
#[should_panic(expected = "Failed to find src_prefix \"////src\" in")]
fn embedded_asset_path_from_external_crate_extraneous_beginning_slashes() {
let asset_path = _embedded_asset_path(
"my_crate",
"////src".as_ref(),
"/path/to/crate/src/foo/plugin.rs".as_ref(),
"the/asset.png".as_ref(),
);
assert_eq!(asset_path, Path::new("my_crate/foo/the/asset.png"));
}
// We don't handle this edge case because it is ambiguous with the
// information currently available to the embedded_path macro.
#[test]
fn embedded_asset_path_from_external_crate_is_ambiguous() {
let asset_path = _embedded_asset_path(
"my_crate",
"src".as_ref(),
"/path/to/.cargo/registry/src/crate/src/src/plugin.rs".as_ref(),
"the/asset.png".as_ref(),
);
// Really, should be "my_crate/src/the/asset.png"
assert_eq!(asset_path, Path::new("my_crate/the/asset.png"));
}
}