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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -0,0 +0,0 @@ public class ServerLevel extends Level implements WorldGenLevel {
     public boolean isPositionTickingWithEntitiesLoaded(BlockPos blockposition) {
         long i = ChunkPos.asLong(blockposition);
 
-        return this.chunkSource.isPositionTicking(i) && this.areEntitiesLoaded(i);
+        // Paper start - optimize is ticking ready type functions
+        ChunkHolder chunkHolder = this.chunkSource.chunkMap.getVisibleChunkIfPresent(i);
+        return chunkHolder != null && chunkHolder.isTickingReady() && this.areEntitiesLoaded(i);
+        // Paper end
     }
 
     public boolean isPositionEntityTicking(BlockPos blockposition) {
-        return this.entityManager.isPositionTicking(blockposition);
+        return this.entityManager.isPositionTicking(ChunkPos.asLong(blockposition)); // Paper
     }
 
     public boolean isPositionEntityTicking(ChunkPos chunkcoordintpair) {
-        return this.entityManager.isPositionTicking(chunkcoordintpair);
+        return this.entityManager.isPositionTicking(chunkcoordintpair.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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/level/ChunkPos.java
+++ b/src/main/java/net/minecraft/world/level/ChunkPos.java
@@ -0,0 +0,0 @@ public class ChunkPos {
     }
 
     public static long asLong(BlockPos blockPos) {
-        return asLong(SectionPos.blockToSectionCoord(blockPos.getX()), SectionPos.blockToSectionCoord(blockPos.getZ()));
+        return (((long)blockPos.getX() >> 4) & 4294967295L) | ((((long)blockPos.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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/level/entity/PersistentEntitySectionManager.java
+++ b/src/main/java/net/minecraft/world/level/entity/PersistentEntitySectionManager.java
@@ -0,0 +0,0 @@ public class PersistentEntitySectionManager<T extends EntityAccess> implements A
     public LevelEntityGetter<T> getEntityGetter() {
         return this.entityGetter;
     }
+    // Paper start
+    public final boolean isPositionTicking(long position) {
+        return this.chunkVisibility.get(position).isTicking();
+    }
+    // Paper end
 
     public boolean isPositionTicking(BlockPos blockposition) {
         return ((Visibility) this.chunkVisibility.get(ChunkPos.asLong(blockposition))).isTicking();