From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: tr7zw <tr7zw@live.de>
Date: Fri, 26 Jun 2020 01:11:47 +0200
Subject: [PATCH] Optimize Hopper logic


diff --git a/src/main/java/net/minecraft/server/BlockDropper.java b/src/main/java/net/minecraft/server/BlockDropper.java
index 65c212690d8ba7c8ea55d4d3b6af1ba3d9f4a7f6..da8c0ee5184a234f485c2f05e2c6edd965576cbe 100644
--- a/src/main/java/net/minecraft/server/BlockDropper.java
+++ b/src/main/java/net/minecraft/server/BlockDropper.java
@@ -36,7 +36,7 @@ public class BlockDropper extends BlockDispenser {
 
             if (!itemstack.isEmpty()) {
                 EnumDirection enumdirection = (EnumDirection) worldserver.getType(blockposition).get(BlockDropper.FACING);
-                IInventory iinventory = TileEntityHopper.b((World) worldserver, blockposition.shift(enumdirection));
+                IInventory iinventory = TileEntityHopper.b((World) worldserver, blockposition.shift(enumdirection), false); // Yatopia
                 ItemStack itemstack1;
 
                 if (iinventory == null) {
diff --git a/src/main/java/net/minecraft/server/BlockHopper.java b/src/main/java/net/minecraft/server/BlockHopper.java
index a29294fbc7cd6fcfff0df9eadd11de3bd7f1405e..2f66740de68667e5c0054a0bc7990256163087cd 100644
--- a/src/main/java/net/minecraft/server/BlockHopper.java
+++ b/src/main/java/net/minecraft/server/BlockHopper.java
@@ -110,6 +110,12 @@ public class BlockHopper extends BlockTileEntity {
     @Override
     public void doPhysics(IBlockData iblockdata, World world, BlockPosition blockposition, Block block, BlockPosition blockposition1, boolean flag) {
         this.a(world, blockposition, iblockdata);
+        // Yatopia start
+        TileEntity tileEntity = world.getTileEntity(blockposition);
+        if (tileEntity instanceof TileEntityHopper) {
+            ((TileEntityHopper) tileEntity).flushCaches();
+        }
+        // Yatopia end
     }
 
     private void a(World world, BlockPosition blockposition, IBlockData iblockdata) {
diff --git a/src/main/java/net/minecraft/server/TileEntityHopper.java b/src/main/java/net/minecraft/server/TileEntityHopper.java
index 95bede605c6401af10f18b641cd12c9d8ec2f207..b4ec6fb407f86bd03d003d9b555df0c58cd6ced5 100644
--- a/src/main/java/net/minecraft/server/TileEntityHopper.java
+++ b/src/main/java/net/minecraft/server/TileEntityHopper.java
@@ -661,14 +661,47 @@ public class TileEntityHopper extends TileEntityLootable implements IHopper, ITi
 
     @Nullable
     private IInventory l() {
+        // Yatopia start
+        if (cachedPush != null) {
+            return cachedPush;
+        }
+        // Yatopia end
         EnumDirection enumdirection = (EnumDirection) this.getBlock().get(BlockHopper.FACING);
 
-        return b(this.getWorld(), this.position.shift(enumdirection));
+        // Yatopia start - replace logic
+        //return b(this.getWorld(), this.position.shift(enumdirection));
+        IInventory tmp = b(this.getWorld(), this.position.shift(enumdirection), cachedPushAir);
+        if (tmp != null && !(tmp instanceof IWorldInventory) && !(tmp instanceof Entity)) {
+            this.cachedPush = tmp;
+        } else {
+            cachedPushAir = true;
+            return tmp;
+        }
+        if (this.cachedPush == null) {
+            this.cachedPushAir = true;
+        }
+        return this.cachedPush;
+        // Yatopia end
     }
 
     @Nullable
     public static IInventory b(IHopper ihopper) {
+        // Yatopia start - replaced logic
+        if (ihopper instanceof TileEntityHopper) {
+            TileEntityHopper hopper = (TileEntityHopper) ihopper;
+            if (hopper.cachedAbove != null) {
+                return hopper.cachedAbove;
+            }
+            IInventory inv = a(ihopper.getWorld(), ihopper.x(), ihopper.z() + 1.0D, ihopper.A(), hopper.cachedPullAir);
+            hopper.cachedAbove = inv;
+            if (hopper.cachedAbove == null) {
+                hopper.cachedPullAir = true;
+            }
+            return inv;
+        } else {
         return a(ihopper.getWorld(), ihopper.x(), ihopper.z() + 1.0D, ihopper.A());
+        }
+        // Yatopia end
     }
 
     public static List<EntityItem> c(IHopper ihopper) {
@@ -683,14 +716,16 @@ public class TileEntityHopper extends TileEntityLootable implements IHopper, ITi
     }
 
     @Nullable
-    public static IInventory b(World world, BlockPosition blockposition) {
-        return a(world, (double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D, true); // Paper
+    public static IInventory b(World world, BlockPosition blockposition, boolean skipBlockCheck) { // Yatopia
+        return a(world, (double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D, true, skipBlockCheck); // Paper // Yatopia
     }
 
     @Nullable
-    public static IInventory a(World world, double d0, double d1, double d2) { return a(world, d0, d1, d2, false); } // Paper - overload to default false
-    public static IInventory a(World world, double d0, double d1, double d2, boolean optimizeEntities) { // Paper
+    public static IInventory a(World world, double d0, double d1, double d2) { return a(world, d0, d1, d2, false); } // Yatopia
+    public static IInventory a(World world, double d0, double d1, double d2, boolean skipBlockCheck) { return a(world, d0, d1, d2, false, skipBlockCheck); } // Paper - overload to default false // Yatopia
+    public static IInventory a(World world, double d0, double d1, double d2, boolean optimizeEntities, boolean skipBlockCheck) { // Paper // Yatopia
         Object object = null;
+        if (!skipBlockCheck) { // Yatopia
         BlockPosition blockposition = new BlockPosition(d0, d1, d2);
         if ( !world.isLoaded( blockposition ) ) return null; // Spigot
         IBlockData iblockdata = world.getType(blockposition);
@@ -708,8 +743,9 @@ public class TileEntityHopper extends TileEntityLootable implements IHopper, ITi
                 }
             }
         }
+        } // Yatopia
 
-        if (object == null && (!optimizeEntities || !org.bukkit.craftbukkit.util.CraftMagicNumbers.getMaterial(block).isOccluding())) { // Paper
+        if (object == null && !optimizeEntities) { // Paper // Yatopia
             List<Entity> list = world.getEntities((Entity) null, new AxisAlignedBB(d0 - 0.5D, d1 - 0.5D, d2 - 0.5D, d0 + 0.5D, d1 + 0.5D, d2 + 0.5D), IEntitySelector.d);
 
             if (!list.isEmpty()) {
@@ -779,4 +815,16 @@ public class TileEntityHopper extends TileEntityLootable implements IHopper, ITi
     protected Container createContainer(int i, PlayerInventory playerinventory) {
         return new ContainerHopper(i, playerinventory, this);
     }
+
+    // Yatopia start
+    private IInventory cachedAbove = null;
+    private IInventory cachedPush = null;
+    private boolean cachedPushAir = false;
+    private boolean cachedPullAir = false;
+    public void flushCaches() {
+        cachedAbove = null;
+        cachedPush = null;
+        cachedPushAir = false;
+        cachedPullAir = false;
+    }
 }