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ItemEntity: fixed O(n^2) performance issue when many of the same unstackable item are in the same place

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this produced a 40% performance improvement in a simulation with 800 item entities.

If the items were all different, then this would still be a problem. However, many of the same unstackable items occupying the same space is a problem for SkyBlock farms, so this should improve performance for SkyBlock quite a bit.
This commit is contained in:
Dylan K. Taylor 2023-07-28 16:06:29 +01:00
parent 1c611a03e6
commit eb53b795d5
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GPG Key ID: 8927471A91CAFD3D
1 changed files with 9 additions and 2 deletions
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11
src/entity/object/ItemEntity.php
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@ -131,7 +131,7 @@ class ItemEntity extends Entity{
}
}
if($this->hasMovementUpdate() && $this->despawnDelay % self::MERGE_CHECK_PERIOD === 0){
if($this->hasMovementUpdate() && $this->isMergeCandidate() && $this->despawnDelay % self::MERGE_CHECK_PERIOD === 0){
$mergeable = [$this]; //in case the merge target ends up not being this
$mergeTarget = $this;
foreach($this->getWorld()->getNearbyEntities($this->boundingBox->expandedCopy(0.5, 0.5, 0.5), $this) as $entity){
@ -173,12 +173,19 @@ class ItemEntity extends Entity{
}
}
private function isMergeCandidate() : bool{
return $this->pickupDelay !== self::NEVER_DESPAWN && $this->item->getCount() < $this->item->getMaxStackSize();
}
/**
* Returns whether this item entity can merge with the given one.
*/
public function isMergeable(ItemEntity $entity) : bool{
if(!$this->isMergeCandidate() || !$entity->isMergeCandidate()){
return false;
}
$item = $entity->item;
return $entity !== $this && $entity->pickupDelay !== self::NEVER_DESPAWN && $item->canStackWith($this->item) && $item->getCount() + $this->item->getCount() <= $item->getMaxStackSize();
return $entity !== $this && $item->canStackWith($this->item) && $item->getCount() + $this->item->getCount() <= $item->getMaxStackSize();
}
/**