106 Zeilen
6.2 KiB
Diff
106 Zeilen
6.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Tue, 20 Feb 2024 18:24:16 -0800
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Subject: [PATCH] Fix entity tracker desync when new players are added to the
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tracker
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The delta position packet instructs the client to update
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the entity position by a position difference. However, this position
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difference is relative to the last position in the entity tracker
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state, not the last position which has been sent to the player. As
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a result, if the last position the player has recorded is different
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than the one stored in the entity tracker (which occurs when a new
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player is added to an existing entity tracker state) then the sent
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position difference will cause a position desync for the client.
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We can resolve this problem by either tracking the last position
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sent per-player, or by simply resetting the last sent position
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in the entity tracker state every time a new player is added.
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Resetting the last sent position every time a new player is
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added to the tracker is just easier to do, so that is what
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this patch does.
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This patch also fixes entities appearing to disappear when
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teleporting to players by changing the initial position
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in the spawn packet to the entities current tracking position.
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When teleporting, the spawn packet will contain the old position
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which is most likely in an unloaded chunk - which means that the
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client will not tick the entity and thus not lerp the entity
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from its old position to its new position.
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diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundAddEntityPacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundAddEntityPacket.java
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index f6e1deb2f849d8b01b15cfa69e2f6cd5f2b1512b..f66e40326c510aa3267542b1a24ed75d1ed6d3f1 100644
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--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundAddEntityPacket.java
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+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundAddEntityPacket.java
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@@ -42,9 +42,11 @@ public class ClientboundAddEntityPacket implements Packet<ClientGamePacketListen
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this(
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entity.getId(),
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entity.getUUID(),
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- entityTrackerEntry.getPositionBase().x(),
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- entityTrackerEntry.getPositionBase().y(),
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- entityTrackerEntry.getPositionBase().z(),
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+ // Paper start - fix entity tracker desync
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+ entity.trackingPosition().x(),
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+ entity.trackingPosition().y(),
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+ entity.trackingPosition().z(),
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+ // Paper end - fix entity tracker desync
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entityTrackerEntry.getLastSentXRot(),
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entityTrackerEntry.getLastSentYRot(),
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entity.getType(),
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diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
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index 67cfc3236a39008cfcf3acffefafda1a604b8573..7833c53b4eff67f2ff37c091b5926cb081205921 100644
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--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
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+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
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@@ -1265,6 +1265,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
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this.serverEntity.addPairing(player);
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}
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// Paper end - entity tracking events
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+ this.serverEntity.onPlayerAdd(); // Paper - fix desync when a player is added to the tracker
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}
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} else if (this.seenBy.remove(player.connection)) {
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this.serverEntity.removePairing(player);
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diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
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index 301e8d6599d200cb0f1328f0e386af2f9a619939..103e2c414780be66324bcb9cd4ea539bbdfe12ad 100644
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--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
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+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
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@@ -100,6 +100,13 @@ public class ServerEntity {
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this.trackedDataValues = entity.getEntityData().getNonDefaultValues();
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}
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+ // Paper start - fix desync when a player is added to the tracker
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+ private boolean forceStateResync;
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+ public void onPlayerAdd() {
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+ this.forceStateResync = true;
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+ }
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+ // Paper end - fix desync when a player is added to the tracker
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+
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public void sendChanges() {
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// Paper start - optimise collisions
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if (((ca.spottedleaf.moonrise.patches.chunk_system.entity.ChunkSystemEntity)this.entity).moonrise$isHardColliding()) {
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@@ -149,7 +156,7 @@ public class ServerEntity {
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}
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}
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- if (this.tickCount % this.updateInterval == 0 || this.entity.hasImpulse || this.entity.getEntityData().isDirty()) {
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+ if (this.forceStateResync || this.tickCount % this.updateInterval == 0 || this.entity.hasImpulse || this.entity.getEntityData().isDirty()) { // Paper - fix desync when a player is added to the tracker
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byte b0 = Mth.packDegrees(this.entity.getYRot());
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byte b1 = Mth.packDegrees(this.entity.getXRot());
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boolean flag = Math.abs(b0 - this.lastSentYRot) >= 1 || Math.abs(b1 - this.lastSentXRot) >= 1;
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@@ -199,7 +206,7 @@ public class ServerEntity {
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long k = this.positionCodec.encodeZ(vec3d);
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boolean flag5 = i < -32768L || i > 32767L || j < -32768L || j > 32767L || k < -32768L || k > 32767L;
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- if (!flag5 && this.teleportDelay <= 400 && !this.wasRiding && this.wasOnGround == this.entity.onGround()) {
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+ if (!this.forceStateResync && !flag5 && this.teleportDelay <= 400 && !this.wasRiding && this.wasOnGround == this.entity.onGround()) { // Paper - fix desync when a player is added to the tracker
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if ((!flag2 || !flag) && !(this.entity instanceof AbstractArrow)) {
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if (flag2) {
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packet1 = new ClientboundMoveEntityPacket.Pos(this.entity.getId(), (short) ((int) i), (short) ((int) j), (short) ((int) k), this.entity.onGround());
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@@ -265,6 +272,7 @@ public class ServerEntity {
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}
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this.entity.hasImpulse = false;
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+ this.forceStateResync = false; // Paper - fix desync when a player is added to the tracker
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}
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++this.tickCount;
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