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da9d110d5b
This patch does not appear to be doing anything useful, and may hide errors. Currently, the save logic does not run through this path either so it did not do anything. Additionally, properly implement support for handling RegionFileSizeException in Moonrise.
50 lines
2.5 KiB
Diff
50 lines
2.5 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/net/minecraft/network/protocol/game/VecDeltaCodec.java b/src/main/java/net/minecraft/network/protocol/game/VecDeltaCodec.java
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index 488ebd443903af812913437f1ade3002093f2470..a043ac10834562d357ef0b5aded2e916e2a0d056 100644
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--- a/src/main/java/net/minecraft/network/protocol/game/VecDeltaCodec.java
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+++ b/src/main/java/net/minecraft/network/protocol/game/VecDeltaCodec.java
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@@ -9,12 +9,12 @@ public class VecDeltaCodec {
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@VisibleForTesting
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static long encode(double value) {
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- return Math.round(value * 4096.0);
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+ return Math.round(value * 4096.0); // Paper - Fix MC-4; diff on change
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}
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@VisibleForTesting
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static double decode(long value) {
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- return (double)value / 4096.0;
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+ return value / 4096.0; // Paper - Fix MC-4; diff on change
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}
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public Vec3 decode(long x, long y, long z) {
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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 7a4aaa56f8d547ebc537657855d5fcdb4ef21e36..e08d20b65fdea46be94228b4b10ba1cb7b3beeb6 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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@@ -4479,6 +4479,16 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
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return;
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}
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// Paper end - Block invalid positions and bounding box
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+ // Paper start - Fix MC-4
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+ if (this instanceof ItemEntity) {
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+ if (io.papermc.paper.configuration.GlobalConfiguration.get().misc.fixEntityPositionDesync) {
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+ // encode/decode from ClientboundMoveEntityPacket
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+ x = Mth.lfloor(x * 4096.0) * (1 / 4096.0);
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+ y = Mth.lfloor(y * 4096.0) * (1 / 4096.0);
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+ z = Mth.lfloor(z * 4096.0) * (1 / 4096.0);
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+ }
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+ }
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+ // Paper end - Fix MC-4
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if (this.position.x != x || this.position.y != y || this.position.z != z) {
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this.position = new Vec3(x, y, z);
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int i = Mth.floor(x);
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