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 d5b37301d4e860c019105445001ed7a9a6f849bd..f4935f7fc3cbd6ba8f079def43bd735364a2ce87 100644
--- a/src/main/java/net/minecraft/Util.java
+++ b/src/main/java/net/minecraft/Util.java
@@ -112,6 +112,7 @@ public class Util {
     }).findFirst().orElseThrow(() -> {
         return new IllegalStateException("No jar file system provider found");
     });
+    public static final double COLLISION_EPSILON = 1.0E-7; // Paper
     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 2b40508750c2f70d1988f324f87e599fc62329f3..a7046e42c1935e9a4e529726072d9f88caaa703a 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -1334,7 +1334,7 @@ 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
                         LivingEntity entityliving = (LivingEntity) entity;
 
                         this.blockUsingShield(entityliving);
@@ -1439,11 +1439,12 @@ public abstract class LivingEntity extends Entity implements Attackable {
                 }
 
                 if (entity1 != null && !source.is(DamageTypeTags.IS_EXPLOSION)) {
-                    double d0 = entity1.getX() - this.getX();
+                    final boolean far = entity1.distanceToSqr(this) > (200.0 * 200.0); // Paper
+                    double d0 = far ? (Math.random() - Math.random()) : entity1.getX() - this.getX(); // Paper
 
                     double d1;
 
-                    for (d1 = entity1.getZ() - this.getZ(); d0 * d0 + d1 * d1 < 1.0E-4D; d1 = (Math.random() - Math.random()) * 0.01D) {
+                    for (d1 = far ? Math.random() - Math.random() : entity1.getZ() - this.getZ(); d0 * d0 + d1 * d1 < 1.0E-4D; d1 = (Math.random() - Math.random()) * 0.01D) { // Paper
                         d0 = (Math.random() - Math.random()) * 0.01D;
                     }
 
@@ -2177,7 +2178,7 @@ public abstract class LivingEntity extends Entity implements Attackable {
                 this.hurtCurrentlyUsedShield((float) -event.getDamage(DamageModifier.BLOCKING));
                 Entity entity = damagesource.getDirectEntity();
 
-                if (entity instanceof LivingEntity) {
+                if (entity instanceof LivingEntity && entity.distanceToSqr(this) <= (200.0D * 200.0D)) { // Paper
                     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 8b562ca6cc92c31c764aebf05d511e347cff8a83..12e3209c5246ede89daaf8455fe70b4a517e12f6 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/Boat.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/Boat.java
@@ -709,8 +709,8 @@ public class Boat extends Entity implements VariantHolder<Boat.Type> {
         this.invFriction = 0.05F;
         if (this.oldStatus == Boat.Status.IN_AIR && this.status != Boat.Status.IN_AIR && this.status != Boat.Status.ON_LAND) {
             this.waterLevel = this.getY(1.0D);
-            this.setPos(this.getX(), (double) (this.getWaterLevelAbove() - this.getBbHeight()) + 0.101D, this.getZ());
-            this.setDeltaMovement(this.getDeltaMovement().multiply(1.0D, 0.0D, 1.0D));
+            this.move(MoverType.SELF, new Vec3(0.0, ((double) (this.getWaterLevelAbove() - this.getBbHeight()) + 0.101D) - this.getY(), 0.0)); // Paper
+            this.setDeltaMovement(this.getDeltaMovement().multiply(1.0D, 0.0D, 1.0D)); // Paper
             this.lastYd = 0.0D;
             this.status = Boat.Status.IN_WATER;
         } else {