69b2ae871c
We were calling `clear()` on the work item buffer table, which caused us to deallocate all the CPU side buffers. This patch changes the logic to instead just clear the buffers individually, but leave their backing stores. This has two consequences: 1. To effectively retain work item buffers from frame to frame, we need to key them off `RetainedViewEntity` values and not the render world `Entity`, which is transient. This PR changes those buffers accordingly. 2. We need to clean up work item buffers that belong to views that went away. Amusingly enough, we actually have a system, `delete_old_work_item_buffers`, that tries to do this already, but it wasn't doing anything because the `clear_batched_gpu_instance_buffers` system already handled that. This patch actually makes the `delete_old_work_item_buffers` system useful, by removing the clearing behavior from `clear_batched_gpu_instance_buffers` and instead making `delete_old_work_item_buffers` delete buffers corresponding to nonexistent views. On Bistro, this PR improves the performance of `batch_and_prepare_binned_render_phase` from 61.2 us to 47.8 us, a 28% speedup.  |
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Bevy Render
