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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.
41 lines
2.6 KiB
Diff
41 lines
2.6 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: Mon, 1 May 2023 18:31:26 -0700
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Subject: [PATCH] Break redstone on top of trap doors early
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This logic hooks into the neighbour update which should be invoked
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as a result of redstone powering the trap door.
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diff --git a/src/main/java/net/minecraft/world/level/block/TrapDoorBlock.java b/src/main/java/net/minecraft/world/level/block/TrapDoorBlock.java
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index 82e38b01446d35aa9745be6ff3c7647b46379682..336fcf4af0ffb416b5595a9e65172f36cc36aaa3 100644
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--- a/src/main/java/net/minecraft/world/level/block/TrapDoorBlock.java
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+++ b/src/main/java/net/minecraft/world/level/block/TrapDoorBlock.java
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@@ -153,7 +153,26 @@ public class TrapDoorBlock extends HorizontalDirectionalBlock implements SimpleW
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flag1 = eventRedstone.getNewCurrent() > 0;
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}
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// CraftBukkit end
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- if ((Boolean) state.getValue(TrapDoorBlock.OPEN) != flag1) {
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+ // Paper start - break redstone on trapdoors early
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+ boolean open = (Boolean) state.getValue(TrapDoorBlock.OPEN) != flag1;
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+ // note: this must run before any state for this block/its neighborus are written to the world
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+ // we allow the redstone event to fire so that plugins can block
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+ if (flag1 && open) { // if we are now powered and it caused the trap door to open
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+ // in this case, first check for the redstone on top first
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+ BlockPos abovePos = pos.above();
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+ BlockState above = world.getBlockState(abovePos);
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+ if (above.getBlock() instanceof RedStoneWireBlock) {
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+ world.setBlock(abovePos, Blocks.AIR.defaultBlockState(), Block.UPDATE_CLIENTS | Block.UPDATE_NEIGHBORS);
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+ Block.popResource(world, abovePos, new net.minecraft.world.item.ItemStack(net.minecraft.world.item.Items.REDSTONE));
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+ // now check that this didn't change our state
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+ if (world.getBlockState(pos) != state) {
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+ // our state was changed, so we cannot propagate this update
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+ return;
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+ }
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+ }
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+ }
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+ if (open) {
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+ // Paper end - break redstone on trapdoors early
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state = (BlockState) state.setValue(TrapDoorBlock.OPEN, flag1);
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this.playSound((Player) null, world, pos, flag1);
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}
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