1 files changed, 128 insertions, 0 deletions
diff --git a/paper-server/patches/features/0023-Lag-compensation-ticks.patch b/paper-server/patches/features/0023-Lag-compensation-ticks.patch
new file mode 100644
index 0000000000..c764bdee4a
--- /dev/null
+++ b/paper-server/patches/features/0023-Lag-compensation-ticks.patch
@@ -0,0 +1,128 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <[email protected]>
+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/net/minecraft/server/MinecraftServer.java b/net/minecraft/server/MinecraftServer.java
+index 0c35921acebd88f3a9a37676e47e7482dfea6d9c..1ff57c17f7fe3af3fb7fc5fbc5148ca333b5e618 100644
+--- a/net/minecraft/server/MinecraftServer.java
++++ b/net/minecraft/server/MinecraftServer.java
+@@ -301,6 +301,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
+     public final io.papermc.paper.configuration.PaperConfigurations paperConfigurations; // Paper - add paper configuration files
+     public boolean isIteratingOverLevels = false; // Paper - Throw exception on world create while being ticked
+     private final Set<String> pluginsBlockingSleep = new java.util.HashSet<>(); // Paper - API to allow/disallow tick sleeping
++    public static final long SERVER_INIT = System.nanoTime(); // Paper - Lag compensation
+ 
+     public static <S extends MinecraftServer> S spin(Function<Thread, S> threadFunction) {
+         ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry.init(); // Paper - rewrite data converter system
+@@ -1643,6 +1644,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
+         for (ServerLevel serverLevel : this.getAllLevels()) {
+             serverLevel.hasPhysicsEvent = org.bukkit.event.block.BlockPhysicsEvent.getHandlerList().getRegisteredListeners().length > 0; // Paper - BlockPhysicsEvent
+             serverLevel.hasEntityMoveEvent = io.papermc.paper.event.entity.EntityMoveEvent.getHandlerList().getRegisteredListeners().length > 0; // Paper - Add EntityMoveEvent
++            serverLevel.updateLagCompensationTick(); // Paper - lag compensation
+             profilerFiller.push(() -> serverLevel + " " + serverLevel.dimension().location());
+             /* Drop global time updates
+             if (this.tickCount % 20 == 0) {
+diff --git a/net/minecraft/server/level/ServerLevel.java b/net/minecraft/server/level/ServerLevel.java
+index ffb5bfdd76a92bac61c7c352fdded4200d13b3ae..651a65aaa37f2cf26d54f75529cbda71e6fc2bc4 100644
+--- a/net/minecraft/server/level/ServerLevel.java
++++ b/net/minecraft/server/level/ServerLevel.java
+@@ -2678,4 +2678,16 @@ public class ServerLevel extends Level implements ServerEntityGetter, WorldGenLe
+         return this.server.getPlayerList().getPlayer(uuid);
+     }
+     // Paper end - check global player list where appropriate
++
++    // Paper start - lag compensation
++    private long lagCompensationTick = MinecraftServer.SERVER_INIT;
++
++    public long getLagCompensationTick() {
++        return this.lagCompensationTick;
++    }
++
++    public void updateLagCompensationTick() {
++        this.lagCompensationTick = (System.nanoTime() - MinecraftServer.SERVER_INIT) / (java.util.concurrent.TimeUnit.MILLISECONDS.toNanos(50L));
++    }
++    // Paper end - lag compensation
+ }
+diff --git a/net/minecraft/server/level/ServerPlayerGameMode.java b/net/minecraft/server/level/ServerPlayerGameMode.java
+index bf2a4c03afb73367a6d2530c78ff9f7c06f7f6a6..6207f45e7b84af4e6a2e4eb7b9fabf6b1e22a63a 100644
+--- a/net/minecraft/server/level/ServerPlayerGameMode.java
++++ b/net/minecraft/server/level/ServerPlayerGameMode.java
+@@ -111,7 +111,7 @@ public class ServerPlayerGameMode {
+     }
+ 
+     public void tick() {
+-        this.gameTicks = net.minecraft.server.MinecraftServer.currentTick; // CraftBukkit
++        this.gameTicks = (int) this.level.getLagCompensationTick(); // Paper - lag compensation
+         if (this.hasDelayedDestroy) {
+             BlockState blockState = this.level.getBlockStateIfLoaded(this.delayedDestroyPos); // Paper - Don't allow digging into unloaded chunks
+             if (blockState == null || blockState.isAir()) { // Paper - Don't allow digging into unloaded chunks
+diff --git a/net/minecraft/world/entity/LivingEntity.java b/net/minecraft/world/entity/LivingEntity.java
+index 635e6e49483194c43b0ab47b5e1bacfe84613c3a..195e1151f7b2a32d6c4eb67edd1952e38f58b266 100644
+--- a/net/minecraft/world/entity/LivingEntity.java
++++ b/net/minecraft/world/entity/LivingEntity.java
+@@ -3828,6 +3828,10 @@ public abstract class LivingEntity extends Entity implements Attackable {
+         this.resendPossiblyDesyncedDataValues(java.util.List.of(DATA_LIVING_ENTITY_FLAGS), serverPlayer);
+     }
+     // Paper end - Properly cancel usable items
++    // 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)) {
+@@ -3841,7 +3845,12 @@ public abstract class LivingEntity extends Entity implements Attackable {
+ 
+     protected void updateUsingItem(ItemStack usingItem) {
+         usingItem.onUseTick(this.level(), this, this.getUseItemRemainingTicks());
+-        if (--this.useItemRemaining == 0 && !this.level().isClientSide && !usingItem.useOnRelease()) {
++        // Paper start - lag compensate eating
++        // we add 1 to the expected time to avoid lag compensating when we should not
++        final boolean shouldLagCompensate = this.useItem.has(DataComponents.FOOD) && this.eatStartTime != -1 && (System.nanoTime() - this.eatStartTime) > ((1L + this.totalEatTimeTicks) * 50L * (1000L * 1000L));
++        if ((--this.useItemRemaining == 0 || shouldLagCompensate) && !this.level().isClientSide && !usingItem.useOnRelease()) {
++            this.useItemRemaining = 0;
++            // Paper end - lag compensate eating
+             this.completeUsingItem();
+         }
+     }
+@@ -3875,7 +3884,10 @@ public abstract class LivingEntity extends Entity implements Attackable {
+         ItemStack itemInHand = this.getItemInHand(hand);
+         if (!itemInHand.isEmpty() && !this.isUsingItem() || forceUpdate) { // Paper - Prevent consuming the wrong itemstack
+             this.useItem = itemInHand;
+-            this.useItemRemaining = itemInHand.getUseDuration(this);
++            // Paper start - lag compensate eating
++            this.useItemRemaining = this.totalEatTimeTicks = itemInHand.getUseDuration(this);
++            this.eatStartTime = System.nanoTime();
++            // Paper end - lag compensate eating
+             if (!this.level().isClientSide) {
+                 this.setLivingEntityFlag(1, true);
+                 this.setLivingEntityFlag(2, hand == InteractionHand.OFF_HAND);
+@@ -3899,7 +3911,10 @@ 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 - lag compensate eating
+             }
+         }
+     }
+@@ -4023,7 +4038,10 @@ 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 - lag compensate eating
+     }
+ 
+     public boolean isBlocking() {