From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Mon, 2 Aug 2021 10:10:40 +0200
Subject: [PATCH] Improve boat collision performance


diff --git a/src/main/java/net/minecraft/Util.java b/src/main/java/net/minecraft/Util.java
index 42d7ecfab6f72517904451d9df3f0404b176fdb2..5869f2f5c72f736e6b077683327c64b9e0e0c733 100644
--- a/src/main/java/net/minecraft/Util.java
+++ b/src/main/java/net/minecraft/Util.java
@@ -125,6 +125,7 @@ public class Util {
         .filter(fileSystemProvider -> fileSystemProvider.getScheme().equalsIgnoreCase("jar"))
         .findFirst()
         .orElseThrow(() -> new IllegalStateException("No jar file system provider found"));
+    public static final double COLLISION_EPSILON = 1.0E-7; // Paper - Improve boat collision performance
     private static Consumer<String> thePauser = message -> {
     };
 
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index eedbf5e73dcf4019f408a9098e020488d32ccf4c..ba4d69415a68442a93026c3ca9213f0fa44ca62e 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -1437,7 +1437,7 @@ public abstract class LivingEntity extends Entity implements Attackable {
                 if (!source.is(DamageTypeTags.IS_PROJECTILE)) {
                     Entity entity = source.getDirectEntity();
 
-                    if (entity instanceof LivingEntity) {
+                    if (entity instanceof LivingEntity && entity.distanceToSqr(this) <= (200.0D * 200.0D)) { // Paper - Improve boat collision performance
                         LivingEntity entityliving = (LivingEntity) entity;
 
                         this.blockUsingShield(entityliving);
@@ -1547,8 +1547,13 @@ public abstract class LivingEntity extends Entity implements Attackable {
                     double d0 = 0.0D;
                     double d1 = 0.0D;
                     Entity entity2 = source.getDirectEntity();
-
-                    if (entity2 instanceof Projectile) {
+                    // Paper start - improve boat collision performance
+                    final boolean far = entity2.distanceToSqr(this) > (200.0D * 200.0D);
+                    if (far) {
+                        d0 = Math.random() - Math.random();
+                        d1 = Math.random() - Math.random();
+                    } else if (entity2 instanceof Projectile) {
+                        // Paper end - improve boat collision performance
                         Projectile iprojectile = (Projectile) entity2;
                         DoubleDoubleImmutablePair doubledoubleimmutablepair = iprojectile.calculateHorizontalHurtKnockbackDirection(this, source);
 
@@ -2352,7 +2357,7 @@ public abstract class LivingEntity extends Entity implements Attackable {
                 this.hurtCurrentlyUsedShield((float) -event.getDamage(DamageModifier.BLOCKING));
                 Entity entity = damagesource.getDirectEntity();
 
-                if (!damagesource.is(DamageTypeTags.IS_PROJECTILE) && entity instanceof LivingEntity) { // Paper - Fix shield disable inconsistency
+                if (!damagesource.is(DamageTypeTags.IS_PROJECTILE) && entity instanceof LivingEntity && entity.distanceToSqr(this) <= (200.0D * 200.0D)) { // Paper - Fix shield disable inconsistency & improve boat collision performance
                     this.blockUsingShield((LivingEntity) entity);
                 }
             }
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/Boat.java b/src/main/java/net/minecraft/world/entity/vehicle/Boat.java
index 907f751c859855484151fb5d607acee2f2a35076..edd30d872d151f953df28c8f6d40efa8d39f5e36 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/Boat.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/Boat.java
@@ -718,7 +718,7 @@ public class Boat extends VehicleEntity implements Leashable, VariantHolder<Boat
             double d2 = (double) (this.getWaterLevelAbove() - this.getBbHeight()) + 0.101D;
 
             if (this.level().noCollision(this, this.getBoundingBox().move(0.0D, d2 - this.getY(), 0.0D))) {
-                this.setPos(this.getX(), d2, this.getZ());
+                this.move(MoverType.SELF, new Vec3(0.0D, d2 - this.getY(), 0.0D)); // Paper - improve boat collision performance
                 this.setDeltaMovement(this.getDeltaMovement().multiply(1.0D, 0.0D, 1.0D));
                 this.lastYd = 0.0D;
             }