From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Thu, 16 Apr 2020 16:13:59 -0700
Subject: [PATCH] Optimize ServerLevels chunk level checking methods

These can be hot functions (i.e entity ticking and block ticking),
so inline where possible, and avoid the abstraction of the
Either class.

diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index e531c2ed2432b0184878cc3fcfe0bc91a551977c..c3db29bc1b24a976617068a4ddae062857d61097 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -2251,19 +2251,22 @@ public class ServerLevel extends Level implements WorldGenLevel {
     }
 
     private boolean isPositionTickingWithEntitiesLoaded(long chunkPos) {
-        return this.areEntitiesLoaded(chunkPos) && this.chunkSource.isPositionTicking(chunkPos);
+        // Paper start - optimize is ticking ready type functions
+        ChunkHolder chunkHolder = this.chunkSource.chunkMap.getVisibleChunkIfPresent(chunkPos);
+        return chunkHolder != null && this.chunkSource.isPositionTicking(chunkPos) && chunkHolder.isTickingReady() && this.areEntitiesLoaded(chunkPos);
+        // Paper end
     }
 
     public boolean isPositionEntityTicking(BlockPos pos) {
-        return this.entityManager.canPositionTick(pos) && this.chunkSource.chunkMap.getDistanceManager().inEntityTickingRange(ChunkPos.asLong(pos));
+        return this.entityManager.canPositionTick(ChunkPos.asLong(pos)) && this.chunkSource.chunkMap.getDistanceManager().inEntityTickingRange(ChunkPos.asLong(pos)); // Paper
     }
 
     public boolean isNaturalSpawningAllowed(BlockPos pos) {
-        return this.entityManager.canPositionTick(pos);
+        return this.entityManager.canPositionTick(ChunkPos.asLong(pos)); // Paper
     }
 
     public boolean isNaturalSpawningAllowed(ChunkPos pos) {
-        return this.entityManager.canPositionTick(pos);
+        return this.entityManager.canPositionTick(pos.toLong()); // Paper
     }
 
     private final class EntityCallbacks implements LevelCallback<Entity> {
diff --git a/src/main/java/net/minecraft/world/level/ChunkPos.java b/src/main/java/net/minecraft/world/level/ChunkPos.java
index 2d41f619577b41d6420159668bbab70fb6c762eb..ed0b136e99def41d4377f2004477826b3546a145 100644
--- a/src/main/java/net/minecraft/world/level/ChunkPos.java
+++ b/src/main/java/net/minecraft/world/level/ChunkPos.java
@@ -60,7 +60,7 @@ public class ChunkPos {
     }
 
     public static long asLong(BlockPos pos) {
-        return asLong(SectionPos.blockToSectionCoord(pos.getX()), SectionPos.blockToSectionCoord(pos.getZ()));
+        return (((long)pos.getX() >> 4) & 4294967295L) | ((((long)pos.getZ() >> 4) & 4294967295L) << 32); // Paper - inline
     }
 
     public static int getX(long pos) {
diff --git a/src/main/java/net/minecraft/world/level/entity/PersistentEntitySectionManager.java b/src/main/java/net/minecraft/world/level/entity/PersistentEntitySectionManager.java
index 6e3d02fb68741fc3cf7d74ec659a37e5a1ecac5c..e53e912351a0753c429512f018281a656837bde2 100644
--- a/src/main/java/net/minecraft/world/level/entity/PersistentEntitySectionManager.java
+++ b/src/main/java/net/minecraft/world/level/entity/PersistentEntitySectionManager.java
@@ -383,6 +383,11 @@ public class PersistentEntitySectionManager<T extends EntityAccess> implements A
     public LevelEntityGetter<T> getEntityGetter() {
         return this.entityGetter;
     }
+    // Paper start
+    public final boolean canPositionTick(long position) {
+        return this.chunkVisibility.get(position).isTicking();
+    }
+    // Paper end
 
     public boolean canPositionTick(BlockPos pos) {
         return ((Visibility) this.chunkVisibility.get(ChunkPos.asLong(pos))).isTicking();