85 lines
4.2 KiB
Diff
85 lines
4.2 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 cdf1177ca7b4b1b0808176c455f62b395146da50..26db8a5d92d494e5f6ba9498d5a1aa555642a92b 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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@@ -469,4 +469,9 @@ 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/server/EntityItem.java b/src/main/java/net/minecraft/server/EntityItem.java
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index ba73d14437cfdf07ef0f1f6266131c113c2741fd..f41aaa7623c052b9f4044898d1bdee898c03057a 100644
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--- a/src/main/java/net/minecraft/server/EntityItem.java
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+++ b/src/main/java/net/minecraft/server/EntityItem.java
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@@ -523,4 +523,16 @@ public class EntityItem extends Entity {
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public Packet<?> P() {
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return new PacketPlayOutSpawnEntity(this);
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}
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+
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+ // Paper start - fix MC-4
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+ public void setPositionRaw(double x, double y, double z) {
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+ if (com.destroystokyo.paper.PaperConfig.fixEntityPositionDesync) {
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+ // encode/decode from PacketPlayOutEntity
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+ x = MathHelper.floorLong(x * 4096.0D) * (1 / 4096.0D);
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+ y = MathHelper.floorLong(y * 4096.0D) * (1 / 4096.0D);
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+ z = MathHelper.floorLong(z * 4096.0D) * (1 / 4096.0D);
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+ }
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+ super.setPositionRaw(x, y, z);
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+ }
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+ // Paper end - fix MC-4
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}
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diff --git a/src/main/java/net/minecraft/server/MathHelper.java b/src/main/java/net/minecraft/server/MathHelper.java
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index 1731a1bca5ad02fd8cd8701f49c10cb74ee6f503..2e7721a650c5a351b3584665bd236f92ef577761 100644
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--- a/src/main/java/net/minecraft/server/MathHelper.java
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+++ b/src/main/java/net/minecraft/server/MathHelper.java
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@@ -7,7 +7,7 @@ import java.util.function.IntPredicate;
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public class MathHelper {
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public static final float a = c(2.0F);
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- private static final float[] b = (float[]) SystemUtils.a((Object) (new float[65536]), (afloat) -> {
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+ private static final float[] b = (float[]) SystemUtils.a((new float[65536]), (afloat) -> { // Paper - decompile error
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for (int i = 0; i < afloat.length; ++i) {
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afloat[i] = (float) Math.sin((double) i * 3.141592653589793D * 2.0D / 65536.0D);
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}
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@@ -47,6 +47,7 @@ public class MathHelper {
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return d0 < (double) i ? i - 1 : i;
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}
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+ public static long floorLong(double d0) { return d(d0); } // Paper - OBFHELPER
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public static long d(double d0) {
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long i = (long) d0;
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diff --git a/src/main/java/net/minecraft/server/PacketPlayOutEntity.java b/src/main/java/net/minecraft/server/PacketPlayOutEntity.java
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index e5da2b19c1177ba7f88f0aaad9d810bb313ce67b..8e48407fd405ac4c3eece7762b8155c5d0f00fa0 100644
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--- a/src/main/java/net/minecraft/server/PacketPlayOutEntity.java
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+++ b/src/main/java/net/minecraft/server/PacketPlayOutEntity.java
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@@ -15,11 +15,11 @@ public class PacketPlayOutEntity implements Packet<PacketListenerPlayOut> {
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protected boolean i;
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public static long a(double d0) {
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- return MathHelper.d(d0 * 4096.0D);
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+ return MathHelper.d(d0 * 4096.0D); // Paper - check EntityItem#setPositionRaw on update
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}
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public static Vec3D a(long i, long j, long k) {
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- return (new Vec3D((double) i, (double) j, (double) k)).a(2.44140625E-4D);
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+ return (new Vec3D((double) i, (double) j, (double) k)).a(2.44140625E-4D); // Paper - check EntityItem#setPositionRaw on update
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}
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public PacketPlayOutEntity() {}
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