Reimplement hopper optimization patch (#2388)

Co-authored-by: Shane Freeder <theboyetronic@gmail.com>

Spigot-Server-Patches/0407-Avoid-hopper-searches-if-there-are-no-items.patch

@@ -13,24 +13,25 @@ And since minecart hoppers are used _very_ rarely near we can avoid alot of sear
 
 Combined, this adds up a lot.
 
+
 diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
-index a9aa13fbf8..cb56d067b9 100644
+index d604f96c1..67dc837f4 100644
 --- a/src/main/java/net/minecraft/server/Chunk.java
 +++ b/src/main/java/net/minecraft/server/Chunk.java
-@@ -95,6 +95,10 @@ public class Chunk implements IChunkAccess {
+@@ -84,6 +84,10 @@ public class Chunk implements IChunkAccess {
+             return removed;
          }
      }
-     final PaperLightingQueue.LightingQueue lightingQueue = new PaperLightingQueue.LightingQueue(this);
 +    // Track the number of minecarts and items
 +    // Keep this synced with entitySlices.add() and entitySlices.remove()
 +    private final int[] itemCounts = new int[16];
 +    private final int[] inventoryEntityCounts = new int[16];
      // Paper end
-     public boolean areNeighborsLoaded(final int radius) {
+ 
-         switch (radius) {
+     public Chunk(World world, ChunkCoordIntPair chunkcoordintpair, BiomeBase[] abiomebase, ChunkConverter chunkconverter, TickList<Block> ticklist, TickList<FluidType> ticklist1, long i, @Nullable ChunkSection[] achunksection, @Nullable Consumer<Chunk> consumer) {
-@@ -690,6 +694,13 @@ public class Chunk implements IChunkAccess {
+@@ -436,6 +440,13 @@ public class Chunk implements IChunkAccess {
          entity.chunkY = k;
-         entity.chunkZ = this.locZ;
+         entity.chunkZ = this.loc.z;
          this.entitySlices[k].add(entity);
 +        // Paper start
 +        if (entity instanceof EntityItem) {
@@ -39,10 +40,10 @@ index a9aa13fbf8..cb56d067b9 100644
 +            inventoryEntityCounts[k]++;
 +        }
 +        // Paper end
+         entity.entitySlice = this.entitySlices[k]; // Paper
+         this.markDirty(); // Paper
      }
- 
+@@ -466,6 +477,11 @@ public class Chunk implements IChunkAccess {
-     public void a(HeightMap.Type heightmap_type, long[] along) {
-@@ -714,6 +725,11 @@ public class Chunk implements IChunkAccess {
          if (!this.entitySlices[i].remove(entity)) {
              return;
          }
@@ -52,25 +53,25 @@ index a9aa13fbf8..cb56d067b9 100644
 +            inventoryEntityCounts[i]--;
 +        }
          entityCounts.decrement(entity.getMinecraftKeyString());
+         this.markDirty(); // Paper
          // Paper end
-     }
+@@ -715,6 +731,15 @@ public class Chunk implements IChunkAccess {
-@@ -959,6 +975,15 @@ public class Chunk implements IChunkAccess {
+         for (int k = i; k <= j; ++k) {
-             if (!this.entitySlices[k].isEmpty()) {
+             Iterator iterator = this.entitySlices[k].iterator(); // Spigot
-                 Iterator iterator = this.entitySlices[k].iterator();
  
-+                // Paper start - Don't search for inventories if we have none, and that is all we want
++            // Paper start - Don't search for inventories if we have none, and that is all we want
-+                /*
++            /*
-+                * We check if they want inventories by seeing if it is the static `IEntitySelector.c`
++             * We check if they want inventories by seeing if it is the static `IEntitySelector.c`
-+                *
++             *
-+                * Make sure the inventory selector stays in sync.
++             * Make sure the inventory selector stays in sync.
-+                * It should be the one that checks `var1 instanceof IInventory && var1.isAlive()`
++             * It should be the one that checks `var1 instanceof IInventory && var1.isAlive()`
-+                */
++             */
-+                if (predicate == IEntitySelector.isInventory() && inventoryEntityCounts[k] <= 0) continue;
++            if (predicate == IEntitySelector.isInventory() && inventoryEntityCounts[k] <= 0) continue;
-+                // Paper end
++            // Paper end
-                 while (iterator.hasNext()) {
+             while (iterator.hasNext()) {
-                     Entity entity1 = (Entity) iterator.next();
+                 Entity entity = (Entity) iterator.next();
- 
+                 if (entity.shouldBeRemoved) continue; // Paper
-@@ -995,7 +1020,18 @@ public class Chunk implements IChunkAccess {
+@@ -734,7 +759,18 @@ public class Chunk implements IChunkAccess {
          i = MathHelper.clamp(i, 0, this.entitySlices.length - 1);
          j = MathHelper.clamp(j, 0, this.entitySlices.length - 1);
  
@@ -90,7 +91,7 @@ index a9aa13fbf8..cb56d067b9 100644
  
              while (iterator.hasNext()) {
 diff --git a/src/main/java/net/minecraft/server/IEntitySelector.java b/src/main/java/net/minecraft/server/IEntitySelector.java
-index bbcbb62325..f6916fd455 100644
+index 56488b78d..56739e6ed 100644
 --- a/src/main/java/net/minecraft/server/IEntitySelector.java
 +++ b/src/main/java/net/minecraft/server/IEntitySelector.java
 @@ -11,6 +11,7 @@ public final class IEntitySelector {
@@ -102,5 +103,5 @@ index bbcbb62325..f6916fd455 100644
          return entity instanceof IInventory && entity.isAlive();
      };
 -- 
-2.21.0
+2.22.0