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This patch replaces the vanilla collision code for both block and entity collisions with faster implementations by JellySquid, used originally in her Lithium mod. Optimizes Full Block voxel collisions, and removes streams from Entity collisions Original code by JellySquid, licensed under GNU Lesser General Public License v3.0 you can find the original code on https://github.com/jellysquid3/lithium-fabric/tree/1.15.x/fabric (Yarn mappings) Ported by Co-authored-by: Zoutelande <54509836+Zoutelande@users.noreply.github.com> Touched up by Aikar to keep previous paper optimizations
95 lines
5.8 KiB
Diff
95 lines
5.8 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: Sat, 25 Apr 2020 06:46:35 -0400
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Subject: [PATCH] Fix numerous item duplication issues and teleport issues
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This notably fixes the newest "Donkey Dupe", but also fixes a lot
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of dupe bugs in general around nether portals and entity world transfer
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We also fix item duplication generically by anytime we clone an item
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to drop it on the ground, destroy the source item.
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This avoid an itemstack ever existing twice in the world state pre
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clean up stage.
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So even if something NEW comes up, it would be impossible to drop the
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same item twice because the source was destroyed.
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diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
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index c4f56fc4ba0e6da5e24ab3c1ac4e4a15235442bc..08895dfa7ad856f66c8577834dc875d115896216 100644
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--- a/src/main/java/net/minecraft/server/Entity.java
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+++ b/src/main/java/net/minecraft/server/Entity.java
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@@ -1967,11 +1967,12 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
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} else {
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// CraftBukkit start - Capture drops for death event
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if (this instanceof EntityLiving && !((EntityLiving) this).forceDrops) {
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- ((EntityLiving) this).drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(itemstack));
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+ ((EntityLiving) this).drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemstack)); // Paper - mirror so we can destroy it later
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return null;
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}
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// CraftBukkit end
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- EntityItem entityitem = new EntityItem(this.world, this.locX(), this.locY() + (double) f, this.locZ(), itemstack);
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+ EntityItem entityitem = new EntityItem(this.world, this.locX(), this.locY() + (double) f, this.locZ(), itemstack.cloneItemStack()); // Paper - clone so we can destroy original
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+ itemstack.setCount(0); // Paper - destroy this item - if this ever leaks due to game bugs, ensure it doesn't dupe
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entityitem.defaultPickupDelay();
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// CraftBukkit start
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@@ -2634,6 +2635,12 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
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@Nullable
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public Entity teleportTo(DimensionManager dimensionmanager, BlockPosition location) {
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// CraftBukkit end
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+ // Paper start - fix bad state entities causing dupes
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+ if (!isAlive() || !valid) {
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+ LOGGER.warn("Illegal Entity Teleport " + this + " to " + dimensionmanager + ":" + location, new Throwable());
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+ return null;
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+ }
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+ // Paper end
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if (!this.world.isClientSide && !this.dead) {
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this.world.getMethodProfiler().enter("changeDimension");
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MinecraftServer minecraftserver = this.getMinecraftServer();
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@@ -2759,7 +2766,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
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}
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public boolean canPortal() {
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- return true;
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+ return isAlive() && valid; // Paper
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}
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public float a(Explosion explosion, IBlockAccess iblockaccess, BlockPosition blockposition, IBlockData iblockdata, Fluid fluid, float f) {
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diff --git a/src/main/java/net/minecraft/server/EntityArmorStand.java b/src/main/java/net/minecraft/server/EntityArmorStand.java
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index 8ad131e4fc20efc61b938a5f6ab64379da23bf0d..d35a0b2d94e4f52c257375c35f55b5a41c9f2c12 100644
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--- a/src/main/java/net/minecraft/server/EntityArmorStand.java
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+++ b/src/main/java/net/minecraft/server/EntityArmorStand.java
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@@ -557,7 +557,7 @@ public class EntityArmorStand extends EntityLiving {
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for (i = 0; i < this.handItems.size(); ++i) {
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itemstack = (ItemStack) this.handItems.get(i);
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if (!itemstack.isEmpty()) {
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- drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(itemstack)); // CraftBukkit - add to drops
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+ drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemstack)); // CraftBukkit - add to drops // Paper - mirror so we can destroy it later - though this call site was safe
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this.handItems.set(i, ItemStack.a);
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}
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}
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@@ -565,7 +565,7 @@ public class EntityArmorStand extends EntityLiving {
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for (i = 0; i < this.armorItems.size(); ++i) {
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itemstack = (ItemStack) this.armorItems.get(i);
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if (!itemstack.isEmpty()) {
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- drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(itemstack)); // CraftBukkit - add to drops
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+ drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemstack)); // CraftBukkit - add to drops // Paper - mirror so we can destroy it later - though this call site was safe
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this.armorItems.set(i, ItemStack.a);
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}
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}
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diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
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index 08471184b04690653761a17d79941cd4ae8b1f81..ce8d7877adcc4635ebf2f5743c8b02aa95691102 100644
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--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
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+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
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@@ -777,7 +777,8 @@ public class CraftEventFactory {
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for (org.bukkit.inventory.ItemStack stack : event.getDrops()) {
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if (stack == null || stack.getType() == Material.AIR || stack.getAmount() == 0) continue;
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- world.dropItem(entity.getLocation(), stack);
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+ world.dropItem(entity.getLocation(), stack); // Paper - note: dropItem already clones due to this being bukkit -> NMS
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+ if (stack instanceof CraftItemStack) stack.setAmount(0); // Paper - destroy this item - if this ever leaks due to game bugs, ensure it doesn't dupe, but don't nuke bukkit stacks of manually added items
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}
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return event;
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