PaperMC/patches/server/0749-Preserve-overstacked-loot.patch
Spottedleaf 01a13871de
Rewrite chunk system (#8177)
Patch documentation to come

Issues with the old system that are fixed now:
- World generation does not scale with cpu cores effectively.
- Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps.
- Unreliable prioritisation of chunk gen/load calls that block the main thread.
- Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved.
- Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal.
- Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles.

The above list is not complete. The patch documentation will complete it.

New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil.

Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft.

The old legacy chunk system patches have been moved to the removed folder in case we need them again.
2022-09-26 01:02:51 -07:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: lexikiq <noellekiq@gmail.com>
Date: Mon, 21 Jun 2021 23:21:58 -0400
Subject: [PATCH] Preserve overstacked loot
Preserves overstacked items in loot tables, such as shulker box drops, to prevent the items
from being deleted (as they'd overflow past the bounds of the container)-- or worse, causing
chunk bans via the large amount of NBT created by unstacking the items.
Fixes GH-5140 and GH-4748.
diff --git a/src/main/java/net/minecraft/world/level/storage/loot/LootTable.java b/src/main/java/net/minecraft/world/level/storage/loot/LootTable.java
index 9459b912615c692de7d0ceb6cf5a1cd3516d438b..375d26ac2453f637bac3fa89873b6760095916b7 100644
--- a/src/main/java/net/minecraft/world/level/storage/loot/LootTable.java
+++ b/src/main/java/net/minecraft/world/level/storage/loot/LootTable.java
@@ -56,9 +56,17 @@ public class LootTable {
this.compositeFunction = LootItemFunctions.compose(functions);
}
+ @Deprecated // Paper - preserve overstacked items
public static Consumer<ItemStack> createStackSplitter(Consumer<ItemStack> lootConsumer) {
+ // Paper start - preserve overstacked items
+ return createStackSplitter(lootConsumer, null);
+ }
+
+ public static Consumer<ItemStack> createStackSplitter(Consumer<ItemStack> lootConsumer, @org.jetbrains.annotations.Nullable net.minecraft.server.level.ServerLevel world) {
+ boolean skipSplitter = world != null && !world.paperConfig().fixes.splitOverstackedLoot;
+ // Paper end
return (itemstack) -> {
- if (itemstack.getCount() < itemstack.getMaxStackSize()) {
+ if (skipSplitter || itemstack.getCount() < itemstack.getMaxStackSize()) { // Paper - preserve overstacked items
lootConsumer.accept(itemstack);
} else {
int i = itemstack.getCount();
@@ -95,7 +103,7 @@ public class LootTable {
}
public void getRandomItems(LootContext context, Consumer<ItemStack> lootConsumer) {
- this.getRandomItemsRaw(context, LootTable.createStackSplitter(lootConsumer));
+ this.getRandomItemsRaw(context, LootTable.createStackSplitter(lootConsumer, context.getLevel())); // Paper - preserve overstacked items
}
public ObjectArrayList<ItemStack> getRandomItems(LootContext context) {
diff --git a/src/main/java/net/minecraft/world/level/storage/loot/functions/SetContainerContents.java b/src/main/java/net/minecraft/world/level/storage/loot/functions/SetContainerContents.java
index 057676201aa2d19032537832849f3857425d357a..b5c6b7280a9c6964e2ad4aa9bd4517146c98e727 100644
--- a/src/main/java/net/minecraft/world/level/storage/loot/functions/SetContainerContents.java
+++ b/src/main/java/net/minecraft/world/level/storage/loot/functions/SetContainerContents.java
@@ -46,7 +46,7 @@ public class SetContainerContents extends LootItemConditionalFunction {
NonNullList<ItemStack> nonNullList = NonNullList.create();
this.entries.forEach((entry) -> {
entry.expand(context, (choice) -> {
- choice.createItemStack(LootTable.createStackSplitter(nonNullList::add), context);
+ choice.createItemStack(LootTable.createStackSplitter(nonNullList::add, context.getLevel()), context); // Paper - preserve overstacked items
});
});
CompoundTag compoundTag = new CompoundTag();