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41 lines
2.2 KiB
Diff
41 lines
2.2 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Bjarne Koll <git@lynxplay.dev>
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Date: Mon, 11 Nov 2024 21:35:22 +0100
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Subject: [PATCH] Fix incorrect invulnerability damage reduction
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Fixes incorrect spigot handling of the invulnerability damage
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reduction applied when an already invulnerable entity is damaged with a
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larger damage amount than the initial damage.
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Vanilla still damages entities even if invulnerable if the damage to be
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applied is larger than the previous damage taken. In that case, vanilla
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applies the difference between the previous damage taken and the
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proposed damage.
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Spigot's damage modifier API takes over the computation of damage
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reducing effects, however spigot invokes this handling with the initial
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damage before computing the difference to the previous damage amount.
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This leads to the reduction values to generally be larger than expected,
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as they are computed on the not-yet-reduced value.
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Spigot applies these reductions after calling the EntityDamageEvent and
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*then* subtracts the previous damage point, leading to the final damage
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amount being smaller than expected.
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This patch cannot simply call the EntityDamageEvent with the reduced
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damage, as that would lead to EntityDamageEvent#getDamage() returning
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the already reduced damage, which breaks its method contract.
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Instead, this patch makes use of the DamageModifier API, implementing
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the last-damage-reduction as a DamageModifier.
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diff --git a/src/main/java/org/bukkit/event/entity/EntityDamageEvent.java b/src/main/java/org/bukkit/event/entity/EntityDamageEvent.java
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index ef5b2a0f18c1c126db0b0c4a4d2a57483680665a..73aa5dc079ecb1c38c55ae1916b12edf81b723f5 100644
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--- a/src/main/java/org/bukkit/event/entity/EntityDamageEvent.java
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+++ b/src/main/java/org/bukkit/event/entity/EntityDamageEvent.java
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@@ -247,6 +247,7 @@ public class EntityDamageEvent extends EntityEvent implements Cancellable {
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* raw {@link EntityDamageEvent#getDamage()}.
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*/
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BASE,
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+ INVULNERABILITY_REDUCTION, // Paper - fix invulnerability reduction in EntityDamageEvent - needs to be right under BASE as its the first reduction all others are based on
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/**
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* This represents the damage increased by freezing status.
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*/
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