Paper/patches/server/1025-Lag-compensation-ticks.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sat, 23 Sep 2023 22:05:35 -0700
Subject: [PATCH] Lag compensation ticks
Areas affected by lag comepnsation:
- Block breaking and destroying
- Eating food items
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 1bac9f7894321b5710f5475f6598ec9f3ccd94d3..8f31413c939cc2b0454ad3d9a1b618dbae449d00 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -305,6 +305,9 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
public volatile Thread shutdownThread; // Paper
public volatile boolean abnormalExit = false; // Paper
public boolean isIteratingOverLevels = false; // Paper
+ // Paper start - lag compensation
+ public static final long SERVER_INIT = System.nanoTime();
+ // Paper end - lag compensation
public static <S extends MinecraftServer> S spin(Function<Thread, S> serverFactory) {
AtomicReference<S> atomicreference = new AtomicReference();
@@ -1522,6 +1525,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
Iterator iterator = this.getAllLevels().iterator(); // Paper - move down
while (iterator.hasNext()) {
ServerLevel worldserver = (ServerLevel) iterator.next();
+ worldserver.updateLagCompensationTick(); // Paper - lag compensation
worldserver.hasPhysicsEvent = org.bukkit.event.block.BlockPhysicsEvent.getHandlerList().getRegisteredListeners().length > 0; // Paper
net.minecraft.world.level.block.entity.HopperBlockEntity.skipHopperEvents = worldserver.paperConfig().hopper.disableMoveEvent || org.bukkit.event.inventory.InventoryMoveItemEvent.getHandlerList().getRegisteredListeners().length == 0; // Paper
worldserver.hasEntityMoveEvent = io.papermc.paper.event.entity.EntityMoveEvent.getHandlerList().getRegisteredListeners().length > 0; // Paper
diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index d38559bd6071e2e37dea46068ead80a24702ff3b..ee6d9c19dbc01d46c60d0067664266c203087d8e 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -564,6 +564,17 @@ public class ServerLevel extends Level implements WorldGenLevel {
return player != null && player.level() == this ? player : null;
}
// Paper end
+ // Paper start - lag compensation
+ private long lagCompensationTick = net.minecraft.server.MinecraftServer.SERVER_INIT;
+
+ public long getLagCompensationTick() {
+ return this.lagCompensationTick;
+ }
+
+ public void updateLagCompensationTick() {
+ this.lagCompensationTick = (System.nanoTime() - net.minecraft.server.MinecraftServer.SERVER_INIT) / (java.util.concurrent.TimeUnit.MILLISECONDS.toNanos(50L));
+ }
+ // Paper end - lag compensation
// Add env and gen to constructor, IWorldDataServer -> WorldDataServer
public ServerLevel(MinecraftServer minecraftserver, Executor executor, LevelStorageSource.LevelStorageAccess convertable_conversionsession, PrimaryLevelData iworlddataserver, ResourceKey<Level> resourcekey, LevelStem worlddimension, ChunkProgressListener worldloadlistener, boolean flag, long i, List<CustomSpawner> list, boolean flag1, @Nullable RandomSequences randomsequences, org.bukkit.World.Environment env, org.bukkit.generator.ChunkGenerator gen, org.bukkit.generator.BiomeProvider biomeProvider) {
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
index cd57234a5f1131f48c9726f89262f253e61b9811..106a312aba249d1e83e4b535fc6e741e04ccfd14 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
@@ -124,7 +124,7 @@ public class ServerPlayerGameMode {
}
public void tick() {
- this.gameTicks = MinecraftServer.currentTick; // CraftBukkit;
+ this.gameTicks = (int)this.level.getLagCompensationTick(); // CraftBukkit; // Paper - lag compensation
BlockState iblockdata;
if (this.hasDelayedDestroy) {
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 6d4d46163ffcffa98f400c2656703eb5c4818f40..675d695989cef5d8fc2e85673efbb57ec1bb38bd 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3816,6 +3816,10 @@ public abstract class LivingEntity extends Entity implements Attackable {
this.getEntityData().resendPossiblyDesyncedDataValues(java.util.List.of(DATA_LIVING_ENTITY_FLAGS), serverPlayer);
}
// Paper end
+ // Paper start - lag compensate eating
+ protected long eatStartTime;
+ protected int totalEatTimeTicks;
+ // Paper end - lag compensate eating
private void updatingUsingItem() {
if (this.isUsingItem()) {
if (ItemStack.isSameItem(this.getItemInHand(this.getUsedItemHand()), this.useItem)) {
@@ -3834,7 +3838,12 @@ public abstract class LivingEntity extends Entity implements Attackable {
this.triggerItemUseEffects(stack, 5);
}
- if (--this.useItemRemaining == 0 && !this.level().isClientSide && !stack.useOnRelease()) {
+ // Paper start - lag compensate eating
+ // we add 1 to the expected time to avoid lag compensating when we should not
+ boolean shouldLagCompensate = this.useItem.getItem().isEdible() && this.eatStartTime != -1 && (System.nanoTime() - this.eatStartTime) > ((1 + this.totalEatTimeTicks) * 50 * (1000 * 1000));
+ if ((--this.useItemRemaining == 0 || shouldLagCompensate) && !this.level().isClientSide && !stack.useOnRelease()) {
+ this.useItemRemaining = 0;
+ // Paper end
this.completeUsingItem();
}
@@ -3882,7 +3891,10 @@ public abstract class LivingEntity extends Entity implements Attackable {
if (!itemstack.isEmpty() && !this.isUsingItem() || forceUpdate) { // Paper use override flag
this.useItem = itemstack;
- this.useItemRemaining = itemstack.getUseDuration();
+ // Paper start - lag compensate eating
+ this.useItemRemaining = this.totalEatTimeTicks = itemstack.getUseDuration();
+ this.eatStartTime = System.nanoTime();
+ // Paper end
if (!this.level().isClientSide) {
this.setLivingEntityFlag(1, true);
this.setLivingEntityFlag(2, hand == InteractionHand.OFF_HAND);
@@ -3907,7 +3919,10 @@ public abstract class LivingEntity extends Entity implements Attackable {
}
} else if (!this.isUsingItem() && !this.useItem.isEmpty()) {
this.useItem = ItemStack.EMPTY;
- this.useItemRemaining = 0;
+ // Paper start - lag compensate eating
+ this.useItemRemaining = this.totalEatTimeTicks = 0;
+ this.eatStartTime = -1L;
+ // Paper end
}
}
@@ -4042,7 +4057,10 @@ public abstract class LivingEntity extends Entity implements Attackable {
}
this.useItem = ItemStack.EMPTY;
- this.useItemRemaining = 0;
+ // Paper start - lag compensate eating
+ this.useItemRemaining = this.totalEatTimeTicks = 0;
+ this.eatStartTime = -1L;
+ // Paper end
}
public boolean isBlocking() {