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https://github.com/PaperMC/Paper.git
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4104545b11
"It was from a different time before books were as jank as they are now. As time has gone on they've only proven to be worse and worse."
63 lines
3.4 KiB
Diff
63 lines
3.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: BillyGalbreath <blake.galbreath@gmail.com>
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Date: Tue, 8 Dec 2020 20:24:52 -0600
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Subject: [PATCH] MC-4: Fix item position desync
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This fixes item position desync (MC-4) by running the item coordinates
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through the encode/decode methods of the packet that causes the precision
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loss, which forces the server to lose the same precision as the client
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keeping them in sync.
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diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
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index 652d87fc5d566dba8018c81676329f0e0bca471b..c56e7fb18f9a56c8025eb70a524f028b5942da37 100644
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--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
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+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
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@@ -474,4 +474,9 @@ public class PaperConfig {
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private static void trackPluginScoreboards() {
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trackPluginScoreboards = getBoolean("settings.track-plugin-scoreboards", false);
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}
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+
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+ public static boolean fixEntityPositionDesync = true;
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+ private static void fixEntityPositionDesync() {
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+ fixEntityPositionDesync = getBoolean("settings.fix-entity-position-desync", fixEntityPositionDesync);
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+ }
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}
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diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundMoveEntityPacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundMoveEntityPacket.java
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index b30c08bfb8c55161543a4ef09f2e462e0a1fe4ae..ec93f5300cc7d423ec0d292f0f8443f900d72dab 100644
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--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundMoveEntityPacket.java
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+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundMoveEntityPacket.java
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@@ -21,11 +21,11 @@ public abstract class ClientboundMoveEntityPacket implements Packet<ClientGamePa
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protected final boolean hasPos;
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public static long entityToPacket(double coord) {
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- return Mth.lfloor(coord * 4096.0D);
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+ return Mth.lfloor(coord * 4096.0D); // Paper - check ItemEntity#setPosRaw on update
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}
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public static double packetToEntity(long coord) {
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- return (double)coord / 4096.0D;
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+ return (double)coord / 4096.0D; // Paper - check ItemEntity#setPosRaw on update
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}
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public Vec3 updateEntityPosition(Vec3 orig) {
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diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
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index 9c1b44e45fe9ee1f044e8413002ff4b7c019cfd8..6186a21bd2f6816216c07e18b2eef165ee7bbd32 100644
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--- a/src/main/java/net/minecraft/world/entity/Entity.java
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+++ b/src/main/java/net/minecraft/world/entity/Entity.java
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@@ -3751,6 +3751,16 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n
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}
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public final void setPosRaw(double x, double y, double z) {
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+ // Paper start - fix MC-4
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+ if (this instanceof ItemEntity) {
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+ if (com.destroystokyo.paper.PaperConfig.fixEntityPositionDesync) {
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+ // encode/decode from PacketPlayOutEntity
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+ x = Mth.lfloor(x * 4096.0D) * (1 / 4096.0D);
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+ y = Mth.lfloor(y * 4096.0D) * (1 / 4096.0D);
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+ z = Mth.lfloor(z * 4096.0D) * (1 / 4096.0D);
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+ }
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+ }
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+ // Paper end - fix MC-4
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// Paper start - never allow AABB to become desynced from position
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// hanging has its own special logic
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if (!(this instanceof net.minecraft.world.entity.decoration.HangingEntity) && (this.position.x != x || this.position.y != y || this.position.z != z)) {
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