91 lines
5.3 KiB
Diff
91 lines
5.3 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: Thu, 11 Jun 2020 17:29:42 -0700
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Subject: [PATCH] Fix piston physics inconsistency - MC-188840
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Pistons invoke physics when they move blocks. The physics can cause
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tnt blocks to ignite. However, pistons (when storing the blocks they "moved")
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don't actually go back to the world state sometimes to check if something
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like that happened. As a result they end up moving the tnt like it was
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never ignited. This resulted in the ability to create machines
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that can duplicate tnt, called "world eaters".
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This patch makes the piston logic retrieve the block state from the world
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prevent this from occuring.
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This patch also sets the moved pos to air immediately after creating
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the moving piston TE. This prevents the block from being updated from
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other physics calls by the piston.
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Tested against the following tnt duper design:
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https://www.youtube.com/watch?v=mS7xxNGhjxs
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This patch also affects every type of machine that utilises
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this mechanic. For example, dead coral is removed by a physics
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update when being moved while it is attached to slimeblocks.
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Standard piston machines that don't destroy or modify the
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blocks they move by physics updates should be entirely
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unaffected.
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This patch fixes https://bugs.mojang.com/browse/MC-188840
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This patch also fixes rail duping and carpet duping.
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diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
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index 08f744ee5e83d317f872f9c48e2037a24327d76f..f9831b1ac15c9fa08c7201a43fe9f1824ddc03c3 100644
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--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
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+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
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@@ -421,4 +421,9 @@ public class PaperConfig {
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consoleHasAllPermissions = getBoolean("settings.console-has-all-permissions", consoleHasAllPermissions);
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}
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+ public static boolean allowPistonDuplication;
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+ private static void allowPistonDuplication() {
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+ allowPistonDuplication = getBoolean("settings.unsupported-settings.allow-piston-duplication", config.getBoolean("settings.unsupported-settings.allow-tnt-duplication", false));
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+ set("settings.unsupported-settings.allow-tnt-duplication", null);
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+ }
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}
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diff --git a/src/main/java/net/minecraft/server/BlockPiston.java b/src/main/java/net/minecraft/server/BlockPiston.java
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index 6b1253fe7e8d4bb71d4d19c063d3e84c167c4d7b..0fb6debc0cd5f522614f32f3df1b5f37a415a0f5 100644
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--- a/src/main/java/net/minecraft/server/BlockPiston.java
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+++ b/src/main/java/net/minecraft/server/BlockPiston.java
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@@ -368,12 +368,24 @@ public class BlockPiston extends BlockDirectional {
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}
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for (k = list.size() - 1; k >= 0; --k) {
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- blockposition3 = (BlockPosition) list.get(k);
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- iblockdata1 = world.getType(blockposition3);
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+ // Paper start - fix a variety of piston desync dupes
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+ boolean allowDesync = com.destroystokyo.paper.PaperConfig.allowPistonDuplication;
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+ BlockPosition oldPos = blockposition3 = (BlockPosition) list.get(k);
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+ iblockdata1 = allowDesync ? world.getType(oldPos) : null;
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+ // Paper end - fix a variety of piston desync dupes
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blockposition3 = blockposition3.shift(enumdirection1);
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map.remove(blockposition3);
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world.setTypeAndData(blockposition3, (IBlockData) Blocks.MOVING_PISTON.getBlockData().set(BlockPiston.FACING, enumdirection), 68);
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+ // Paper start - fix a variety of piston desync dupes
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+ if (!allowDesync) {
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+ iblockdata1 = world.getType(oldPos);
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+ map.replace(oldPos, iblockdata1);
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+ }
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world.setTileEntity(blockposition3, BlockPistonMoving.a((IBlockData) list1.get(k), enumdirection, flag, false));
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+ if (!allowDesync) {
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+ world.setTypeAndData(oldPos, Blocks.AIR.getBlockData(), 2 | 4 | 16 | 1024); // set air to prevent later physics updates from seeing this block
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+ }
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+ // Paper end - fix a variety of piston desync dupes
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aiblockdata[j++] = iblockdata1;
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}
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diff --git a/src/main/java/net/minecraft/server/TileEntityPiston.java b/src/main/java/net/minecraft/server/TileEntityPiston.java
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index 5b941321a7fdc561e6b794a1dce5d600083c505d..e7b7e468fc874b0fbcd43f87d816a42420f9b05e 100644
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--- a/src/main/java/net/minecraft/server/TileEntityPiston.java
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+++ b/src/main/java/net/minecraft/server/TileEntityPiston.java
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@@ -256,7 +256,7 @@ public class TileEntityPiston extends TileEntity implements ITickable {
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IBlockData iblockdata = Block.b(this.a, (GeneratorAccess) this.world, this.position);
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if (iblockdata.isAir()) {
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- this.world.setTypeAndData(this.position, this.a, 84);
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+ this.world.setTypeAndData(this.position, this.a, com.destroystokyo.paper.PaperConfig.allowPistonDuplication ? 84 : (84 | 2)); // Paper - force notify (flag 2), it's possible the set type by the piston block (which doesn't notify) set this block to air
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Block.a(this.a, iblockdata, this.world, this.position, 3);
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} else {
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if (iblockdata.b(BlockProperties.C) && (Boolean) iblockdata.get(BlockProperties.C)) {
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