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# Objective Implement a new `AssetChanged` query filter that allows users to query for entities whose related assets may have changed. - Closes https://github.com/bevyengine/bevy/issues/5069 - Unblocks #16420. Currently, `cold-specialization`, a key rendering optimization for unlocking ancillary benefits of the retained render world, is blocked on being unable detect all scenarios in which an entity's mesh/material changes using events and observers. An `AssetChanged` filter will drastically simplify our implementation and be more robust to future changes. Originally implemented by @nicopap in #5080. ## Solution - Adds a new `AssetChanged` query filter that initializes a `AssetChanges<A>` resource that tracks changed assets and ticks in `asset_events`. - ~Reverts #13343 and changes the api of `get_state` to accept `impl Into<UnsafeWorldCell<'w>>` to allow accessing the `AssetChanges<A>` resource.~ - Adds a `AsAssetId` trait used for newtype handle wrappers (e.g. `Mesh3d`) that allows associating a component with the underlying `Asset` it represents. ## Testing - Tests are added for `AssetChanged`. - TBD on performance. We are going to add this `Mesh3d` and `MeshMaterial3d` (etc) in the renderer. Long term wins in render performance this unblocks should swamp tracking overhead for any realistic workload. ## Migration Guide - The `asset_events` system is no longer public. Users should order their systems relative to the `AssetEvents` system set. --------- Co-authored-by: Nicola Papale <nico@nicopap.ch> Co-authored-by: Patrick Walton <pcwalton@mimiga.net> Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> Co-authored-by: Chris Russell <8494645+chescock@users.noreply.github.com> |
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Bevy Asset
