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https://github.com/PaperMC/Paper.git
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595734a57e
Upstream has released updates that appears to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing Bukkit Changes: 01e22e09 Misc maven build updates 746f5324 #556: Allow sending messages from specific UUIDs 92b99cde #501: Add PersistentDataHolder to Chunk CraftBukkit Changes: 4ef13f94 Misc maven build updates 04639f5a #759: Allow sending messages from specific UUIDs 77c894a2 #672: Add PersistentDataHolder to Chunk Spigot Changes: 57bbdd8e Rebuild patches Co-authored-by: Shane Freeder <theboyetronic@gmail.com>
155 lines
7 KiB
Diff
155 lines
7 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 b7bfdab0e8ba47cd78bff77efabc6a2a1936157b..083da88c1dd78b8ecdc8329c94430189cecb9d95 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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@@ -233,7 +233,7 @@ 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 39572cdce691a459cb9df0cc064fbf7bde83a99e..e52df8096e399c84ff8a2637fdd65ea57d9001d0 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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@@ -100,6 +100,7 @@ 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 21aba92fe1b5036a4df3add7688019446a1d5fe5..fba7c9b5724114eab35a3d24febdee3cd3e30aa0 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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@@ -1959,12 +1959,112 @@ 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, true);
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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, true);
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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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