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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.
25 lines
1.7 KiB
Diff
25 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jake Potrebic <jake.m.potrebic@gmail.com>
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Date: Mon, 13 Sep 2021 18:55:45 -0700
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Subject: [PATCH] prevent unintended light block manipulation
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diff --git a/src/main/java/net/minecraft/world/level/block/LightBlock.java b/src/main/java/net/minecraft/world/level/block/LightBlock.java
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index 01722473a4861533dba0ab6edf3982c0278c41e1..2b3c395529a15c9f07a4c0cff7f82199298bcb6d 100644
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--- a/src/main/java/net/minecraft/world/level/block/LightBlock.java
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+++ b/src/main/java/net/minecraft/world/level/block/LightBlock.java
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@@ -49,6 +49,14 @@ public class LightBlock extends Block implements SimpleWaterloggedBlock {
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builder.add(LEVEL, WATERLOGGED);
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}
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+ // Paper start - prevent unintended light block manipulation
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+ @Override
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+ protected net.minecraft.world.ItemInteractionResult useItemOn(final ItemStack stack, final BlockState state, final Level world, final BlockPos pos, final Player player, final net.minecraft.world.InteractionHand hand, final BlockHitResult hit) {
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+ if (player.getItemInHand(hand).getItem() != Items.LIGHT || !player.mayInteract(world, pos) || !player.mayUseItemAt(pos, hit.getDirection(), player.getItemInHand(hand))) { return net.minecraft.world.ItemInteractionResult.SKIP_DEFAULT_BLOCK_INTERACTION; } // Paper - Prevent unintended light block manipulation
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+ return super.useItemOn(stack, state, world, pos, player, hand, hit);
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+ }
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+ // Paper end - prevent unintended light block manipulation
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+
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@Override
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protected InteractionResult useWithoutItem(BlockState state, Level world, BlockPos pos, Player player, BlockHitResult hit) {
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if (!world.isClientSide && player.canUseGameMasterBlocks()) {
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