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Remove wall-time / unused skip tick protection (#11412)

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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.
This commit is contained in:
Bjarne Koll 2024-09-19 16:36:07 +02:00 • committed by GitHub
parent 5c82955733
commit c5a10665b8
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GPG key ID: B5690EEEBB952194
794 changed files with 402 additions and 282 deletions
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219
patches/server/0432-Add-Destroy-Speed-API.patch Normal file
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@ -0,0 +1,219 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Ineusia <ineusia@yahoo.com>
Date: Mon, 26 Oct 2020 11:48:06 -0500
Subject: [PATCH] Add Destroy Speed API
Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
diff --git a/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeInstance.java b/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeInstance.java
index 36c943d709c1c0ae49ec0baf0ccf7b6cb9a2ecf3..d28f9e077a50122e86848cfa9db83f6b0e8eef6c 100644
--- a/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeInstance.java
+++ b/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeInstance.java
@@ -143,20 +143,20 @@ public class AttributeInstance {
double d = this.getBaseValue();
for (AttributeModifier attributeModifier : this.getModifiersOrEmpty(AttributeModifier.Operation.ADD_VALUE)) {
- d += attributeModifier.amount();
+ d += attributeModifier.amount(); // Paper - destroy speed API - diff on change
}
double e = d;
for (AttributeModifier attributeModifier2 : this.getModifiersOrEmpty(AttributeModifier.Operation.ADD_MULTIPLIED_BASE)) {
- e += d * attributeModifier2.amount();
+ e += d * attributeModifier2.amount(); // Paper - destroy speed API - diff on change
}
for (AttributeModifier attributeModifier3 : this.getModifiersOrEmpty(AttributeModifier.Operation.ADD_MULTIPLIED_TOTAL)) {
- e *= 1.0 + attributeModifier3.amount();
+ e *= 1.0 + attributeModifier3.amount(); // Paper - destroy speed API - diff on change
}
- return this.attribute.value().sanitizeValue(e);
+ return attribute.value().sanitizeValue(e); // Paper - destroy speed API - diff on change
}
private Collection<AttributeModifier> getModifiersOrEmpty(AttributeModifier.Operation operation) {
diff --git a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
index 9953b6b36cbcbfd1756bac478b568ca5700fc898..33869e725c3b3f2120fa36ca468019a78321e862 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
@@ -721,4 +721,35 @@ public class CraftBlockData implements BlockData {
public BlockState createBlockState() {
return CraftBlockStates.getBlockState(this.state, null);
}
+
+ // Paper start - destroy speed API
+ @Override
+ public float getDestroySpeed(final ItemStack itemStack, final boolean considerEnchants) {
+ net.minecraft.world.item.ItemStack nmsItemStack = CraftItemStack.unwrap(itemStack);
+ float speed = nmsItemStack.getDestroySpeed(this.state);
+ if (speed > 1.0F && considerEnchants) {
+ final net.minecraft.core.Holder<net.minecraft.world.entity.ai.attributes.Attribute> attribute = net.minecraft.world.entity.ai.attributes.Attributes.MINING_EFFICIENCY;
+ // Logic sourced from AttributeInstance#calculateValue
+ final double initialBaseValue = attribute.value().getDefaultValue();
+ final org.apache.commons.lang3.mutable.MutableDouble modifiedBaseValue = new org.apache.commons.lang3.mutable.MutableDouble(initialBaseValue);
+ final org.apache.commons.lang3.mutable.MutableDouble baseValMul = new org.apache.commons.lang3.mutable.MutableDouble(1);
+ final org.apache.commons.lang3.mutable.MutableDouble totalValMul = new org.apache.commons.lang3.mutable.MutableDouble(1);
+
+ net.minecraft.world.item.enchantment.EnchantmentHelper.forEachModifier(
+ nmsItemStack, net.minecraft.world.entity.EquipmentSlot.MAINHAND, (attributeHolder, attributeModifier) -> {
+ switch (attributeModifier.operation()) {
+ case ADD_VALUE -> modifiedBaseValue.add(attributeModifier.amount());
+ case ADD_MULTIPLIED_BASE -> baseValMul.add(attributeModifier.amount());
+ case ADD_MULTIPLIED_TOTAL -> totalValMul.setValue(totalValMul.doubleValue() * (1D + attributeModifier.amount()));
+ }
+ }
+ );
+
+ final double actualModifier = modifiedBaseValue.doubleValue() * baseValMul.doubleValue() * totalValMul.doubleValue();
+
+ speed += (float) attribute.value().sanitizeValue(actualModifier);
+ }
+ return speed;
+ }
+ // Paper end - destroy speed API
}
diff --git a/src/test/java/io/papermc/paper/block/CraftBlockDataDestroySpeedTest.java b/src/test/java/io/papermc/paper/block/CraftBlockDataDestroySpeedTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..62aef9abab896491f7806490184fc6899ec36c57
--- /dev/null
+++ b/src/test/java/io/papermc/paper/block/CraftBlockDataDestroySpeedTest.java
@@ -0,0 +1,137 @@
+package io.papermc.paper.block;
+
+import java.util.List;
+import java.util.Optional;
+import net.minecraft.core.Holder;
+import net.minecraft.core.HolderSet;
+import net.minecraft.core.component.DataComponentMap;
+import net.minecraft.core.component.DataComponents;
+import net.minecraft.network.chat.Component;
+import net.minecraft.world.entity.EquipmentSlot;
+import net.minecraft.world.entity.EquipmentSlotGroup;
+import net.minecraft.world.entity.ai.attributes.AttributeInstance;
+import net.minecraft.world.entity.ai.attributes.AttributeModifier;
+import net.minecraft.world.entity.ai.attributes.Attributes;
+import net.minecraft.world.item.Items;
+import net.minecraft.world.item.enchantment.Enchantment;
+import net.minecraft.world.item.enchantment.EnchantmentEffectComponents;
+import net.minecraft.world.item.enchantment.EnchantmentHelper;
+import net.minecraft.world.item.enchantment.ItemEnchantments;
+import net.minecraft.world.item.enchantment.LevelBasedValue;
+import net.minecraft.world.item.enchantment.effects.EnchantmentAttributeEffect;
+import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.level.block.state.BlockState;
+import org.bukkit.craftbukkit.block.data.CraftBlockData;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.support.AbstractTestingBase;
+import org.bukkit.util.Vector;
+import org.jetbrains.annotations.NotNull;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import static net.minecraft.resources.ResourceLocation.fromNamespaceAndPath;
+
+/**
+ * CraftBlockData's {@link org.bukkit.craftbukkit.block.data.CraftBlockData#getDestroySpeed(ItemStack, boolean)}
+ * uses a reimplementation of AttributeValue without any map to avoid attribute instance allocation and mutation
+ * for 0 gain.
+ * <p>
+ * This test is responsible for ensuring that said logic emits the expected destroy speed under heavy attribute
+ * modifier use.
+ */
+public class CraftBlockDataDestroySpeedTest extends AbstractTestingBase {
+
+ @Test
+ public void testCorrectEnchantmentDestroySpeedComputation() {
+ // Construct fake enchantment that has *all and multiple of* operations
+ final Enchantment speedEnchantment = speedEnchantment();
+ final BlockState blockStateToMine = Blocks.STONE.defaultBlockState();
+
+ final ItemEnchantments.Mutable mutable = new ItemEnchantments.Mutable(ItemEnchantments.EMPTY);
+ mutable.set(Holder.direct(speedEnchantment), 1);
+
+ final net.minecraft.world.item.ItemStack itemStack = new net.minecraft.world.item.ItemStack(Items.DIAMOND_PICKAXE);
+ itemStack.set(DataComponents.ENCHANTMENTS, mutable.toImmutable());
+
+ // Compute expected value by running the entire attribute instance chain
+ final AttributeInstance dummyInstance = new AttributeInstance(Attributes.MINING_EFFICIENCY, $ -> {
+ });
+ EnchantmentHelper.forEachModifier(itemStack, EquipmentSlot.MAINHAND, (attributeHolder, attributeModifier) -> {
+ if (attributeHolder.is(Attributes.MINING_EFFICIENCY)) dummyInstance.addTransientModifier(attributeModifier);
+ });
+
+ final double toolSpeed = itemStack.getDestroySpeed(blockStateToMine);
+ final double expectedSpeed = toolSpeed <= 1.0F ? toolSpeed : toolSpeed + dummyInstance.getValue();
+
+ // API stack + computation
+ final CraftItemStack craftMirror = CraftItemStack.asCraftMirror(itemStack);
+ final CraftBlockData data = CraftBlockData.createData(blockStateToMine);
+ final float actualSpeed = data.getDestroySpeed(craftMirror, true);
+
+ Assertions.assertEquals(expectedSpeed, actualSpeed, Vector.getEpsilon());
+ }
+
+ /**
+ * Complex enchantment that holds attribute modifiers for the mining efficiency.
+ * The enchantment holds 2 of each operation to also ensure that such behaviour works correctly.
+ *
+ * @return the enchantment.
+ */
+ private static @NotNull Enchantment speedEnchantment() {
+ return new Enchantment(
+ Component.empty(),
+ new Enchantment.EnchantmentDefinition(
+ HolderSet.empty(),
+ Optional.empty(),
+ 0, 0,
+ Enchantment.constantCost(0),
+ Enchantment.constantCost(0),
+ 0,
+ List.of(EquipmentSlotGroup.ANY)
+ ),
+ HolderSet.empty(),
+ DataComponentMap.builder()
+ .set(EnchantmentEffectComponents.ATTRIBUTES, List.of(
+ new EnchantmentAttributeEffect(
+ fromNamespaceAndPath("paper", "base1"),
+ Attributes.MINING_EFFICIENCY,
+ LevelBasedValue.constant(1),
+ AttributeModifier.Operation.ADD_VALUE
+ ),
+ new EnchantmentAttributeEffect(
+ fromNamespaceAndPath("paper", "base2"),
+ Attributes.MINING_EFFICIENCY,
+ LevelBasedValue.perLevel(3),
+ AttributeModifier.Operation.ADD_VALUE
+ ),
+ new EnchantmentAttributeEffect(
+ fromNamespaceAndPath("paper", "base-mul1"),
+ Attributes.MINING_EFFICIENCY,
+ LevelBasedValue.perLevel(7),
+ AttributeModifier.Operation.ADD_MULTIPLIED_BASE
+ ),
+ new EnchantmentAttributeEffect(
+ fromNamespaceAndPath("paper", "base-mul2"),
+ Attributes.MINING_EFFICIENCY,
+ LevelBasedValue.constant(10),
+ AttributeModifier.Operation.ADD_MULTIPLIED_BASE
+ ),
+ new EnchantmentAttributeEffect(
+ fromNamespaceAndPath("paper", "total-mul1"),
+ Attributes.MINING_EFFICIENCY,
+ LevelBasedValue.constant(.2f),
+ AttributeModifier.Operation.ADD_MULTIPLIED_TOTAL
+ ),
+ new EnchantmentAttributeEffect(
+ fromNamespaceAndPath("paper", "total-mul2"),
+ Attributes.MINING_EFFICIENCY,
+ LevelBasedValue.constant(-.5F),
+ AttributeModifier.Operation.ADD_MULTIPLIED_TOTAL
+ )
+ ))
+ .build()
+ );
+ }
+
+}