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Paper/patches/server/0920-Properly-handle-experience-dropping-on-block-break.patch
Bjarne Koll c5a10665b8
Remove wall-time / unused skip tick protection (#11412) 
Spigot still maintains some partial implementation of "tick skipping", a
practice in which the MinecraftServer.currentTick field is updated not
by an increment of one per actual tick, but instead set to
System.currentTimeMillis() / 50. This behaviour means that the tracked
tick may "skip" a tick value in case a previous tick took more than the
expected 50ms.

To compensate for this in important paths, spigot/craftbukkit
implements "wall-time". Instead of incrementing/decrementing ticks on
block entities/entities by one for each call to their tick() method,
they instead increment/decrement important values, like
an ItemEntity's age or pickupDelay, by the difference of
`currentTick - lastTick`, where `lastTick` is the value of
`currentTick` during the last tick() call.

These "fixes" however do not play nicely with minecraft's simulation
distance as entities/block entities implementing the above behaviour
would "catch up" their values when moving from a non-ticking chunk to a
ticking one as their `lastTick` value remains stuck on the last tick in
a ticking chunk and hence lead to a large "catch up" once ticked again.

Paper completely removes the "tick skipping" behaviour (See patch
"Further-improve-server-tick-loop"), making the above precautions
completely unnecessary, which also rids paper of the previous described
incompatibility with non-ticking chunks.
2024-09-19 16:36:07 +02:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Sat, 30 Dec 2023 15:00:06 -0500
Subject: [PATCH] Properly handle experience dropping on block break
This causes spawnAfterBreak to spawn xp by default, removing the need to manually add xp wherever this method is used.
For classes that use custom xp amounts, they can drop the resources with disabling
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 3f87e60c0d43703a8450b5920dac59a970809397..471fd54edf6aa962d997878ee638974f7f594fa8 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -617,7 +617,8 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
if (drop) {
BlockEntity tileentity = iblockdata.hasBlockEntity() ? this.getBlockEntity(pos) : null;
- Block.dropResources(iblockdata, this, pos, tileentity, breakingEntity, ItemStack.EMPTY);
+ Block.dropResources(iblockdata, this, pos, tileentity, breakingEntity, ItemStack.EMPTY, false); // Paper - Properly handle xp dropping
+ iblockdata.getBlock().popExperience((ServerLevel) this, pos, xp, breakingEntity); // Paper - Properly handle xp dropping; custom amount
}
boolean flag1 = this.setBlock(pos, fluid.createLegacyBlock(), 3, maxUpdateDepth);
diff --git a/src/main/java/net/minecraft/world/level/block/Block.java b/src/main/java/net/minecraft/world/level/block/Block.java
index c083dc8b2a69c3747b250d13f1a28ad22b5e6119..bf52c36f31992a01a7403d8c85151327c9e944c4 100644
--- a/src/main/java/net/minecraft/world/level/block/Block.java
+++ b/src/main/java/net/minecraft/world/level/block/Block.java
@@ -312,23 +312,31 @@ public class Block extends BlockBehaviour implements ItemLike {
for (ItemStack drop : Block.getDrops(state, serverLevel, pos, blockEntity)) {
items.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(drop));
}
+ Block block = state.getBlock(); // Paper - Properly handle xp dropping
io.papermc.paper.event.block.BlockBreakBlockEvent event = new io.papermc.paper.event.block.BlockBreakBlockEvent(org.bukkit.craftbukkit.block.CraftBlock.at(levelAccessor, pos), org.bukkit.craftbukkit.block.CraftBlock.at(levelAccessor, source), items);
+ event.setExpToDrop(block.getExpDrop(state, serverLevel, pos, net.minecraft.world.item.ItemStack.EMPTY, true)); // Paper - Properly handle xp dropping
event.callEvent();
for (org.bukkit.inventory.ItemStack drop : event.getDrops()) {
popResource(serverLevel, pos, org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(drop));
}
- state.spawnAfterBreak(serverLevel, pos, ItemStack.EMPTY, true);
+ state.spawnAfterBreak(serverLevel, pos, ItemStack.EMPTY, false); // Paper - Properly handle xp dropping
+ block.popExperience(serverLevel, pos, event.getExpToDrop()); // Paper - Properly handle xp dropping
}
return true;
}
// Paper end - Add BlockBreakBlockEvent
public static void dropResources(BlockState state, Level world, BlockPos pos, @Nullable BlockEntity blockEntity, @Nullable Entity entity, ItemStack tool) {
+ // Paper start - Properly handle xp dropping
+ dropResources(state, world, pos, blockEntity, entity, tool, true);
+ }
+ public static void dropResources(BlockState state, Level world, BlockPos pos, @Nullable BlockEntity blockEntity, @Nullable Entity entity, ItemStack tool, boolean dropExperience) {
+ // Paper end - Properly handle xp dropping
if (world instanceof ServerLevel) {
Block.getDrops(state, (ServerLevel) world, pos, blockEntity, entity, tool).forEach((itemstack1) -> {
Block.popResource(world, pos, itemstack1);
});
- state.spawnAfterBreak((ServerLevel) world, pos, tool, true);
+ state.spawnAfterBreak((ServerLevel) world, pos, tool, dropExperience); // Paper - Properly handle xp dropping
}
}
@@ -412,7 +420,7 @@ public class Block extends BlockBehaviour implements ItemLike {
player.awardStat(Stats.BLOCK_MINED.get(this));
player.causeFoodExhaustion(0.005F, org.bukkit.event.entity.EntityExhaustionEvent.ExhaustionReason.BLOCK_MINED); // CraftBukkit - EntityExhaustionEvent
if (includeDrops) { // Paper - fix drops not preventing stats/food exhaustion
- Block.dropResources(state, world, pos, blockEntity, player, tool);
+ Block.dropResources(state, world, pos, blockEntity, player, tool, dropExp); // Paper - Properly handle xp dropping
} // Paper - fix drops not preventing stats/food exhaustion
}
diff --git a/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java b/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
index a8bec3c405732e5863cf717b1fe948d00837bed2..240c250a93289776686d09d7eae17c07d7278da5 100644
--- a/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
+++ b/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
@@ -1119,6 +1119,7 @@ public abstract class BlockBehaviour implements FeatureElement {
public void spawnAfterBreak(ServerLevel world, BlockPos pos, ItemStack tool, boolean dropExperience) {
this.getBlock().spawnAfterBreak(this.asState(), world, pos, tool, dropExperience);
+ if (dropExperience) {getBlock().popExperience(world, pos, this.getBlock().getExpDrop(asState(), world, pos, tool, true));} // Paper - Properly handle xp dropping
}
public List<ItemStack> getDrops(LootParams.Builder builder) {
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
index 461a66c323a74db5a70981fafc5fa20f54f0f40d..ac11f18690434922179b61ffcc3036dea025b0cb 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
@@ -509,7 +509,7 @@ public class CraftBlock implements Block {
// Modelled off EntityHuman#hasBlock
if (block != Blocks.AIR && (item == null || !iblockdata.requiresCorrectToolForDrops() || nmsItem.isCorrectToolForDrops(iblockdata))) {
- net.minecraft.world.level.block.Block.dropResources(iblockdata, this.world.getMinecraftWorld(), this.position, this.world.getBlockEntity(this.position), null, nmsItem);
+ net.minecraft.world.level.block.Block.dropResources(iblockdata, this.world.getMinecraftWorld(), this.position, this.world.getBlockEntity(this.position), null, nmsItem, false); // Paper - Properly handle xp dropping
// Paper start - improve Block#breanNaturally
if (triggerEffect) {
if (iblockdata.getBlock() instanceof net.minecraft.world.level.block.BaseFireBlock) {
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