From c86880704c90a04a4f7a660823757fea8f2a7f0c Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Fri, 18 Mar 2016 20:16:03 -0400
Subject: [PATCH] Add World Util Methods

Methods that can be used for other patches to help improve logic.

diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index cc4a9dbe6..84a880561 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -581,6 +581,7 @@ public class Chunk {
 
     }
 
+    public final int getLightSubtracted(BlockPosition blockposition, int i) { return this.a(blockposition, i); } // Paper - OBFHELPER
     public int a(BlockPosition blockposition, int i) {
         int j = blockposition.getX() & 15;
         int k = blockposition.getY();
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 6be9c1815..b8ae41704 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -77,7 +77,7 @@ public abstract class World implements IBlockAccess {
     public final List<Entity> j = Lists.newArrayList();
     protected final IntHashMap<Entity> entitiesById = new IntHashMap();
     private final long K = 16777215L;
-    private int L;
+    private int L; private int getSkylightSubtracted() { return this.L; } // Paper - OBFHELPER
     protected int l = (new Random()).nextInt();
     protected final int m = 1013904223;
     protected float n;
@@ -156,6 +156,12 @@ public abstract class World implements IBlockAccess {
         return (CraftServer) Bukkit.getServer();
     }
 
+    // Paper start
+    public Chunk getChunkIfLoaded(BlockPosition blockposition) {
+        return ((ChunkProviderServer) this.chunkProvider).getChunkIfLoaded(blockposition.getX() >> 4, blockposition.getZ() >> 4);
+    }
+    // Paper end
+
     public Chunk getChunkIfLoaded(int x, int z) {
         return ((ChunkProviderServer) this.chunkProvider).getChunkIfLoaded(x, z);
     }
@@ -686,10 +692,46 @@ public abstract class World implements IBlockAccess {
         }
     }
 
+    // Paper start - test if meets light level, return faster
+    // logic copied from below
+    public boolean isLightLevel(BlockPosition blockposition, int level) {
+        if (isValidLocation(blockposition)) {
+            if (this.getType(blockposition).f()) {
+                if (this.c(blockposition.up(), false) >= level) {
+                    return true;
+                }
+                if (this.c(blockposition.east(), false) >= level) {
+                    return true;
+                }
+                if (this.c(blockposition.west(), false) >= level) {
+                    return true;
+                }
+                if (this.c(blockposition.south(), false) >= level) {
+                    return true;
+                }
+                if (this.c(blockposition.north(), false) >= level) {
+                    return true;
+                }
+                return false;
+            } else {
+                if (blockposition.getY() >= 256) {
+                    blockposition = new BlockPosition(blockposition.getX(), 255, blockposition.getZ());
+                }
+
+                Chunk chunk = this.getChunkAtWorldCoords(blockposition);
+                return chunk.getLightSubtracted(blockposition, this.getSkylightSubtracted()) >= level;
+            }
+        } else {
+            return true;
+        }
+    }
+    // Paper end
+
     public int getLightLevel(BlockPosition blockposition) {
         return this.c(blockposition, true);
     }
 
+    public final int getLight(BlockPosition blockposition, boolean checkNeighbors) { return this.c(blockposition, checkNeighbors); } // Paper - OBFHELPER
     public int c(BlockPosition blockposition, boolean flag) {
         if (blockposition.getX() >= -30000000 && blockposition.getZ() >= -30000000 && blockposition.getX() < 30000000 && blockposition.getZ() < 30000000) {
             if (flag && this.getType(blockposition).f()) {
@@ -805,6 +847,27 @@ public abstract class World implements IBlockAccess {
         return this.worldProvider.o()[this.getLightLevel(blockposition)];
     }
 
+    // Paper start - reduces need to do isLoaded before getType
+    public IBlockData getTypeIfLoaded(BlockPosition blockposition) {
+        // CraftBukkit start - tree generation
+        if (captureTreeGeneration) {
+            Iterator<BlockState> it = capturedBlockStates.iterator();
+            while (it.hasNext()) {
+                BlockState previous = it.next();
+                if (previous.getX() == blockposition.getX() && previous.getY() == blockposition.getY() && previous.getZ() == blockposition.getZ()) {
+                    return CraftMagicNumbers.getBlock(previous.getTypeId()).fromLegacyData(previous.getRawData());
+                }
+            }
+        }
+        // CraftBukkit end
+        Chunk chunk = this.getChunkIfLoaded(blockposition);
+        if (chunk != null) {
+            return this.isValidLocation(blockposition) ? chunk.getBlockData(blockposition) : Blocks.AIR.getBlockData();
+        }
+        return null;
+    }
+    // Paper end
+
     public IBlockData getType(BlockPosition blockposition) {
         // CraftBukkit start - tree generation
         if (captureTreeGeneration) {
-- 
2.17.1