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c5a10665b8
Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
20 lines
1.1 KiB
Diff
20 lines
1.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sun, 7 Jun 2020 19:25:13 -0400
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Subject: [PATCH] Use seed based lookup for Treasure Maps - Fixes lag from
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carto/sunken maps
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diff --git a/src/main/java/net/minecraft/world/item/MapItem.java b/src/main/java/net/minecraft/world/item/MapItem.java
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index 36de7c63370c529579d31ba1d77ec12b754ef313..ce461b1a8d7fab87ae28e30205f6fab67f1808b6 100644
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--- a/src/main/java/net/minecraft/world/item/MapItem.java
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+++ b/src/main/java/net/minecraft/world/item/MapItem.java
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@@ -206,7 +206,7 @@ public class MapItem extends ComplexItem {
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for (int n = 0; n < 128; n++) {
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for (int o = 0; o < 128; o++) {
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- Holder<Biome> holder = world.getBiome(mutableBlockPos.set((l + o) * i, 0, (m + n) * i));
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+ Holder<Biome> holder = world.getUncachedNoiseBiome((l + o) * i, 0, (m + n) * i); // Paper - Perf: Use seed based lookup for treasure maps
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bls[n * 128 + o] = holder.is(BiomeTags.WATER_ON_MAP_OUTLINES);
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}
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}
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