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# Objective Right now, all assets in the main world get extracted and prepared in the render world (if the asset's using the RenderAssetPlugin). This is unfortunate for two cases: 1. **TextureAtlas** / **FontAtlas**: This one's huge. The individual `Image` assets that make up the atlas are cloned and prepared individually when there's no reason for them to be. The atlas textures are built on the CPU in the main world. *There can be hundreds of images that get prepared for rendering only not to be used.* 2. If one loads an Image and needs to transform it in a system before rendering it, kind of like the [decompression example](https://github.com/bevyengine/bevy/blob/main/examples/asset/asset_decompression.rs#L120), there's a price paid for extracting & preparing the asset that's not intended to be rendered yet. ------ * References #10520 * References #1782 ## Solution This changes the `RenderAssetPersistencePolicy` enum to bitflags. I felt that the objective with the parameter is so similar in nature to wgpu's [`TextureUsages`](https://docs.rs/wgpu/latest/wgpu/struct.TextureUsages.html) and [`BufferUsages`](https://docs.rs/wgpu/latest/wgpu/struct.BufferUsages.html), that it may as well be just like that. ```rust // This asset only needs to be in the main world. Don't extract and prepare it. RenderAssetUsages::MAIN_WORLD // Keep this asset in the main world and RenderAssetUsages::MAIN_WORLD | RenderAssetUsages::RENDER_WORLD // This asset is only needed in the render world. Remove it from the asset server once extracted. RenderAssetUsages::RENDER_WORLD ``` ### Alternate Solution I considered introducing a third field to `RenderAssetPersistencePolicy` enum: ```rust enum RenderAssetPersistencePolicy { /// Keep the asset in the main world after extracting to the render world. Keep, /// Remove the asset from the main world after extracting to the render world. Unload, /// This doesn't need to be in the render world at all. NoExtract, // <----- } ``` Functional, but this seemed like shoehorning. Another option is renaming the enum to something like: ```rust enum RenderAssetExtractionPolicy { /// Extract the asset and keep it in the main world. Extract, /// Remove the asset from the main world after extracting to the render world. ExtractAndUnload, /// This doesn't need to be in the render world at all. NoExtract, } ``` I think this last one could be a good option if the bitflags are too clunky. ## Migration Guide * `RenderAssetPersistencePolicy::Keep` → `RenderAssetUsage::MAIN_WORLD | RenderAssetUsage::RENDER_WORLD` (or `RenderAssetUsage::default()`) * `RenderAssetPersistencePolicy::Unload` → `RenderAssetUsage::RENDER_WORLD` * For types implementing the `RenderAsset` trait, change `fn persistence_policy(&self) -> RenderAssetPersistencePolicy` to `fn asset_usage(&self) -> RenderAssetUsages`. * Change any references to `cpu_persistent_access` (`RenderAssetPersistencePolicy`) to `asset_usage` (`RenderAssetUsage`). This applies to `Image`, `Mesh`, and a few other types. |
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