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https://github.com/PaperMC/Paper.git
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edd6b6a2ba
Blow up if a plugin tries to mutate visibleChunks directly and prevent them from doing so. Also provide a safe get call if any plugins directly call get on it so that it uses the special logic to check pending. Also restores ABI for the visibleChunks field back to what it was too. Additionally, remove the stack trace from Timings Stack Corruption for any error thrown on Minecraft Timings, and tell them to get the error ABOVE this instead, so people stop giving us useless error reports. Also fixes a memory leak when the source map down sizes but dest map didn't, which resulted in lingering references to old chunk holders. Fixes #3414
165 lines
7.8 KiB
Diff
165 lines
7.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: MeFisto94 <MeFisto94@users.noreply.github.com>
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Date: Tue, 12 May 2020 23:02:43 +0200
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Subject: [PATCH] Workaround for Client Lag Spikes (MC-162253)
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When crossing certain chunk boundaries, the client needlessly
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calculates light maps for chunk neighbours. In some specific map
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configurations, these calculations cause a 500ms+ freeze on the Client.
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This patch basically serves as a workaround by sending light maps
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to the client, so that it doesn't attempt to calculate them.
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This mitigates the frametime impact to a minimum (but it's still there).
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diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
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index 8c1f3290d23795b58a30274c9437dc7dc43fa3a1..33cca62d90bf037df1b0b4e901baedb91400aee7 100644
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--- a/src/main/java/net/minecraft/server/Chunk.java
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+++ b/src/main/java/net/minecraft/server/Chunk.java
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@@ -277,7 +277,7 @@ public class Chunk implements IChunkAccess {
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// broadcast
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Object[] backingSet = inRange.getBackingSet();
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- Packet[] chunkPackets = new Packet[2];
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+ Packet[] chunkPackets = new Packet[10];
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for (int index = 0, len = backingSet.length; index < len; ++index) {
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Object temp = backingSet[index];
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if (!(temp instanceof EntityPlayer)) {
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diff --git a/src/main/java/net/minecraft/server/ChunkSection.java b/src/main/java/net/minecraft/server/ChunkSection.java
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index b7b06e082e59f8518be2036637385c7710d524ea..71da9f00b8a969e84414066fb1852cecb9440e14 100644
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--- a/src/main/java/net/minecraft/server/ChunkSection.java
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+++ b/src/main/java/net/minecraft/server/ChunkSection.java
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@@ -99,6 +99,7 @@ public class ChunkSection {
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return this.nonEmptyBlockCount == 0;
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}
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+ public static boolean isEmpty(@Nullable ChunkSection chunksection) { return a(chunksection) ; } // Paper - OBFHELPER
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public static boolean a(@Nullable ChunkSection chunksection) {
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return chunksection == Chunk.a || chunksection.c();
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}
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diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
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index f9252f7e9fbb8785487acf6b332f80bc43bbdfdd..f1c3cb3ff8961bc688a1d38cd79b999e539cf866 100644
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--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
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+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
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@@ -402,7 +402,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
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player.needsChunkCenterUpdate = false;
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player.playerConnection.sendPacket(new PacketPlayOutViewCentre(currPosX, currPosZ));
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}
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- PlayerChunkMap.this.sendChunk(player, new ChunkCoordIntPair(rangeX, rangeZ), new Packet[2], false, true); // unloaded, loaded
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+ PlayerChunkMap.this.sendChunk(player, new ChunkCoordIntPair(rangeX, rangeZ), new Packet[10], false, true); // unloaded, loaded
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},
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(EntityPlayer player, int rangeX, int rangeZ, int currPosX, int currPosZ, int prevPosX, int prevPosZ,
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com.destroystokyo.paper.util.misc.PooledLinkedHashSets.PooledObjectLinkedOpenHashSet<EntityPlayer> newState) -> {
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@@ -1955,12 +1955,112 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
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}
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+ // Paper start
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+ private static int getLightMask(final Chunk chunk) {
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+ final ChunkSection[] chunkSections = chunk.getSections();
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+ int mask = 0;
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+
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+ for (int i = 0; i < chunkSections.length; ++i) {
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+ /*
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+
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+
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+Lightmasks have 18 bits, from the -1 (void) section until the 17th (air) section.
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+Sections go from 0..16. Now whenever a section is not empty, it can potentially change lighting for the section itself, the section below and the section above, hence the bitmask 111b, which is 7d.
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+
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+ */
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+ mask |= (ChunkSection.isEmpty(chunkSections[i]) ? 0 : 7) << i;
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+ }
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+
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+ return mask;
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+ }
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+
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+ private static int getCeilingLightMask(final Chunk chunk) {
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+ int mask = getLightMask(chunk);
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+
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+ /*
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+ It is similar to get highest bit, it would turn an 001010 into an 001111 so basically the highest bit and all below.
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+ We then invert this, so we'd have 110000 and compare that to the "main" chunk.
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+ This is because the bug only appears when the current chunks lightmaps are higher than those of the neighbors, thus we can omit sending neighbors which are lower than the current chunks lights.
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+
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+ so TLDR is that getCeilingLightMask returns a light mask with all bits set below the highest affected section. We could also count the number of leading zeros and invert them, somehow.
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+ @TODO: Implement Leafs suggestion
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+ either use Integer#numberOfLeadingZeros or document what this bithack is supposed to be doing then
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+ */
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+ mask |= mask >> 1;
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+ mask |= mask >> 2;
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+ mask |= mask >> 4;
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+ mask |= mask >> 8;
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+ mask |= mask >> 16;
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+
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+ return mask;
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+ }
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+ // Paper end
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+
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final void sendChunk(EntityPlayer entityplayer, Packet<?>[] apacket, Chunk chunk) { this.a(entityplayer, apacket, chunk); } // Paper - OBFHELPER
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private void a(EntityPlayer entityplayer, Packet<?>[] apacket, Chunk chunk) {
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if (apacket[0] == null) {
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+ // Paper start - add 8 for light fix workaround
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+ if (apacket.length != 10) { // in case Plugins call sendChunk, resize
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+ apacket = new Packet[10];
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+ }
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+ // Paper end
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apacket[0] = new PacketPlayOutMapChunk(chunk, 65535);
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apacket[1] = new PacketPlayOutLightUpdate(chunk.getPos(), this.lightEngine);
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+
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+ // Paper start - Fix MC-162253
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+ final int lightMask = getLightMask(chunk);
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+ int i = 1;
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+ for (int x = -1; x <= 1; x++) {
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+ for (int z = -1; z <= 1; z++) {
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+ if (x == 0 && z == 0) {
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+ continue;
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+ }
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+
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+ ++i;
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+
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+ if (!chunk.isNeighbourLoaded(x, z)) {
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+ continue;
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+ }
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+
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+ final Chunk neighbor = chunk.getRelativeNeighbourIfLoaded(x, z);
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+ final int updateLightMask = lightMask & ~getCeilingLightMask(neighbor);
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+
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+ if (updateLightMask == 0) {
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+ continue;
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+ }
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+
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+ apacket[i] = new PacketPlayOutLightUpdate(new ChunkCoordIntPair(chunk.getPos().x + x, chunk.getPos().z + z), lightEngine, updateLightMask, 0);
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+ }
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+ }
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+ }
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+
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+ final int viewDistance = playerViewDistanceBroadcastMap.getLastViewDistance(entityplayer);
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+ final long lastPosition = playerViewDistanceBroadcastMap.getLastCoordinate(entityplayer);
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+
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+ int j = 1;
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+ for (int x = -1; x <= 1; x++) {
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+ for (int z = -1; z <= 1; z++) {
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+ if (x == 0 && z == 0) {
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+ continue;
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+ }
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+
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+ ++j;
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+
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+ Packet<?> packet = apacket[j];
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+ if (packet == null) {
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+ continue;
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+ }
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+
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+ final int distX = Math.abs(MCUtil.getCoordinateX(lastPosition) - (chunk.getPos().x + x));
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+ final int distZ = Math.abs(MCUtil.getCoordinateZ(lastPosition) - (chunk.getPos().z + z));
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+
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+ if (Math.max(distX, distZ) > viewDistance) {
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+ continue;
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+ }
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+ entityplayer.playerConnection.sendPacket(packet);
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+ }
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}
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+ // Paper end - Fix MC-162253
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entityplayer.a(chunk.getPos(), apacket[0], apacket[1]);
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PacketDebug.a(this.world, chunk.getPos());
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