Paper/patches/server/0375-Don-t-run-entity-collision-code-if-not-needed.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Wed, 15 Apr 2020 17:56:07 -0700
Subject: [PATCH] Don't run entity collision code if not needed
Will not run if:
Max entity cramming is disabled and the max collisions per entity is less than or equal to 0.
Entity#isPushable() returns false, meaning all entities will not be able to collide with this
entity anyways.
The entity's current team collision rule causes them to NEVER collide.
Co-authored-by: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 1a6581a1524ab6599b13e6ae3fd419d59a1c915d..4c4a0f8d9c48f15095d9ce5c1773bf58b35137af 100644
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--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
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@@ -3399,10 +3399,24 @@ public abstract class LivingEntity extends Entity implements Attackable {
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if (this.level().isClientSide()) {
this.level().getEntities(EntityTypeTest.forClass(net.minecraft.world.entity.player.Player.class), this.getBoundingBox(), EntitySelector.pushableBy(this)).forEach(this::doPush);
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} else {
+ // Paper start - don't run getEntities if we're not going to use its result
+ if (!this.isPushable()) {
+ return;
+ }
+ net.minecraft.world.scores.Team team = this.getTeam();
+ if (team != null && team.getCollisionRule() == net.minecraft.world.scores.Team.CollisionRule.NEVER) {
+ return;
+ }
+
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+ int i = this.level().getGameRules().getInt(GameRules.RULE_MAX_ENTITY_CRAMMING);
+ if (i <= 0 && this.level().paperConfig().collisions.maxEntityCollisions <= 0) {
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+ return;
+ }
+ // Paper end - don't run getEntities if we're not going to use its result
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List<Entity> list = this.level().getEntities((Entity) this, this.getBoundingBox(), EntitySelector.pushableBy(this));
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if (!list.isEmpty()) {
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- int i = this.level().getGameRules().getInt(GameRules.RULE_MAX_ENTITY_CRAMMING);
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+ // Paper - moved up
if (i > 0 && list.size() > i - 1 && this.random.nextInt(4) == 0) {
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int j = 0;