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Fix piston physics inconsistency (fix tnt dupers) (#3544) 

Co-authored-by: Spottedleaf <Spottedleaf@users.noreply.github.com>
This commit is contained in:
Spottedleaf 2020-06-12 00:30:30 -07:00 committed by GitHub
parent 8c41ac1c98
commit 91459fe514
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2 changed files with 71 additions and 0 deletions
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13
Spigot-Server-Patches/0003-MC-Dev-fixes.patch
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@ -640,6 +640,19 @@ index ee2059cf8ef0a0372e02b91a4bf6fa8a0ab31bca..77bb6b092a0763ff27f90f0401a8a81b
}
}
diff --git a/src/main/java/net/minecraft/server/TileEntityPiston.java b/src/main/java/net/minecraft/server/TileEntityPiston.java
index 79df42f5e53464f07e76d22cd1317637145e2056..489175abd8e582a3c082364fec357c4f061a22d7 100644
--- a/src/main/java/net/minecraft/server/TileEntityPiston.java
+++ b/src/main/java/net/minecraft/server/TileEntityPiston.java
@@ -137,7 +137,7 @@ public class TileEntityPiston extends TileEntity implements ITickable {
private static void a(EnumDirection enumdirection, Entity entity, double d0, EnumDirection enumdirection1) {
TileEntityPiston.h.set(enumdirection);
entity.move(EnumMoveType.PISTON, new Vec3D(d0 * (double) enumdirection1.getAdjacentX(), d0 * (double) enumdirection1.getAdjacentY(), d0 * (double) enumdirection1.getAdjacentZ()));
- TileEntityPiston.h.set((Object) null);
+ TileEntityPiston.h.set(null); // Paper - decompile fix
}
private void g(float f) {
diff --git a/src/main/java/net/minecraft/server/VillagePlace.java b/src/main/java/net/minecraft/server/VillagePlace.java
index c137484f66a022f7f4581d0657210d60c619c5fa..c999f8c9bf8a59e19b3d6d1b7ad8b5fb6e48b928 100644
--- a/src/main/java/net/minecraft/server/VillagePlace.java

58
Spigot-Server-Patches/0541-Fix-piston-physics-inconsistency-MC-188840.patch Normal file
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@ -0,0 +1,58 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Thu, 11 Jun 2020 17:29:42 -0700
Subject: [PATCH] Fix piston physics inconsistency - MC-188840
Pistons invoke physics when they move blocks. The physics can cause
tnt blocks to ignite. However, pistons (when storing the blocks they "moved")
don't actually go back to the world state sometimes to check if something
like that happened. As a result they end up moving the tnt like it was
never ignited. This resulted in the ability to create machines
that can duplicate tnt, called "world eaters".
This patch makes the piston logic retrieve the block state from the world
prevent this from occuring.
Tested against the following tnt duper design:
https://www.youtube.com/watch?v=mS7xxNGhjxs
This patch also affects every type of machine that utilises
this mechanic. For example, dead coral is removed by a physics
update when being moved while it is attached to slimeblocks.
Standard piston machines that don't destroy or modify the
blocks they move by physics updates should be entirely
unaffected.
This patch fixes https://bugs.mojang.com/browse/MC-188840
diff --git a/src/main/java/net/minecraft/server/BlockPiston.java b/src/main/java/net/minecraft/server/BlockPiston.java
index b29525c40dc8e3ae747b8ddf5a3bd79b7cc0b792..880aa8c86d1724cd9ef68e0abfff8bb38f389462 100644
--- a/src/main/java/net/minecraft/server/BlockPiston.java
+++ b/src/main/java/net/minecraft/server/BlockPiston.java
@@ -364,11 +364,11 @@ public class BlockPiston extends BlockDirectional {
for (k = list.size() - 1; k >= 0; --k) {
blockposition3 = (BlockPosition) list.get(k);
- iblockdata1 = world.getType(blockposition3);
+ iblockdata1 = world.getType(blockposition3); map.replace(blockposition3, iblockdata1); // Paper - fix piston physics inconsistency
blockposition3 = blockposition3.shift(enumdirection1);
map.remove(blockposition3);
world.setTypeAndData(blockposition3, (IBlockData) Blocks.MOVING_PISTON.getBlockData().set(BlockPiston.FACING, enumdirection), 68);
- world.setTileEntity(blockposition3, BlockPistonMoving.a((IBlockData) list1.get(k), enumdirection, flag, false));
+ world.setTileEntity(blockposition3, BlockPistonMoving.a(iblockdata1, enumdirection, flag, false)); // Paper - fix piston physics inconsistency
--j;
aiblockdata[j] = iblockdata1;
}
diff --git a/src/main/java/net/minecraft/server/TileEntityPiston.java b/src/main/java/net/minecraft/server/TileEntityPiston.java
index 489175abd8e582a3c082364fec357c4f061a22d7..946522f6362638f518fba15172fb7f676d46b67c 100644
--- a/src/main/java/net/minecraft/server/TileEntityPiston.java
+++ b/src/main/java/net/minecraft/server/TileEntityPiston.java
@@ -275,7 +275,7 @@ public class TileEntityPiston extends TileEntity implements ITickable {
IBlockData iblockdata = Block.b(this.a, (GeneratorAccess) this.world, this.position);
if (iblockdata.isAir()) {
- this.world.setTypeAndData(this.position, this.a, 84);
+ this.world.setTypeAndData(this.position, this.a, 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
Block.a(this.a, iblockdata, this.world, this.position, 3);
} else {
if (iblockdata.b((IBlockState) BlockProperties.C) && (Boolean) iblockdata.get(BlockProperties.C)) {