WorldCell queries and commands #3092
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bjorn3
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Nov 9, 2021
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| //! A copy of "appendlist" crate sources, extended with draining iterator. | |||
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WorldCell was removed in #12551, visit the linked PR for the rationale. |
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A proof of concept implementation for RFC #42.
Implements runtime-checked ECS queries and commands through shared access to
WorldCellinstance. Those queries see the world as if all queued commands up to their creation point were applied. Every query iterator has its own snapshot of world saved essentially as a diff applied during iteration over the true world data.This PR is currently not feature-complete, but already useful subset of what would have to be implemented. A few commands are missing (mostly bundles support), and the implementation definitely could be improved in many places. But it does serve a purpose of proving that the proposed RFC design is possible to implement, and should be a good starting point for future work.