fixes#6709
we really need a better way to reverse-engineer the chance parameter for these
as the wiki just gives a probability table, which is quite tiresome to extract
patterns from.
PlayerRespawnAnchorUseEvent is also added with options SET_SPAWN and EXPLODE, which allows plugins to customise the outcome of using the anchor in PM, which currently doesn't support dimensions. The event is also cancellable.
I want to do the same for items, but items are going to be a pain in the ass.
For items there are multiple possible entry points and all of them will need to be checked:
- dropped items
- inventory contents
- lecterns
- item frames
I don't see a good way to deal with all these. We can't check for registration in the constructor
because we need to fully construct the item in order to register it.
Blocks are also a potential issue in other areas, but setBlock() is definitely the biggest offender.
if not, this will cause random crashes in core code, which assumes that state IDs found on runtime chunk memory are valid and registered.
this problem exists in other places too, and probably requires a rethink of how we're dealing with this, but for now, this will do as a band-aid.
This PR significantly improves performance of entity movement calculation.
Previous attempts to optimise this were ineffective, as they used a cache to mitigate the cost of recomputing AABBs. Entities tend to move around randomly, so the non-cached pathway really needed to be optimized.
This change improves performance on multiple fronts:
1) avoiding Block allocations for blocks with 1x1x1 AABBs and with no AABBs (the most common)
2) avoiding Block allocations and overlapping intersection checks unless a stateID is specifically known to potentially exceed its cell boundaries (like fences)
3) avoiding overlapping AABB checks when overlaps can't make any difference anyway (cubes)
Together, these changes improve the performance of World->getBlockCollisionBoxes() by a factor of 5. In real-world terms, this shows up as a major performance improvement in situations with lots of entities moving in random directions. Testing with item entities showed an increase from 400 to 1200 moving items with the same CPU usage.
This change is built on the assumption that `Block->recalculateCollisionBoxes()` and its overrides don't interact with any world. This is technically possible due to the crappy design of the `Block` architecture, but should be avoided. As a world is not available during `RuntimeBlockStateRegistry` initialization, attempting to interact with a world during `recalculateCollisionBoxes()` will now cause a crash.
This turned out to be a problem for `ChorusPlant`, which was fixed by 70fb9bbdfd06c7eda00b4cd2c2c3840755e6b8f6. The correct solution in this case was to use dynamic states similar to how we currently deal with fence connections.
