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This upstreams the code changes used by the new renderer to enable cross-app Entity reuse: * Spawning at specific entities * get_or_spawn: spawns an entity if it doesn't already exist and returns an EntityMut * insert_or_spawn_batch: the batched equivalent to `world.get_or_spawn(entity).insert_bundle(bundle)` * Clearing entities and storages * Allocating Entities with "invalid" archetypes. These entities cannot be queried / are treated as "non existent". They serve as "reserved" entities that won't show up when calling `spawn()`. They must be "specifically spawned at" using apis like `get_or_spawn(entity)`. In combination, these changes enable the "render world" to clear entities / storages each frame and reserve all "app world entities". These can then be spawned during the "render extract step". This refactors "spawn" and "insert" code in a way that I think is a massive improvement to legibility and re-usability. It also yields marginal performance wins by reducing some duplicate lookups (less than a percentage point improvement on insertion benchmarks). There is also some potential for future unsafe reduction (by making BatchSpawner and BatchInserter generic). But for now I want to cut down generic usage to a minimum to encourage smaller binaries and faster compiles. This is currently a draft because it needs more tests (although this code has already had some real-world testing on my custom-shaders branch). I also fixed the benchmarks (which currently don't compile!) / added new ones to illustrate batching wins. After these changes, Bevy ECS is basically ready to accommodate the new renderer. I think the biggest missing piece at this point is "sub apps". |
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| .. | ||
| map_entities.rs | ||
| mod.rs | ||
| serde.rs | ||