From 03a5bbc6127c86e3c71c9ea293663681d1c6ba40 Mon Sep 17 00:00:00 2001
From: Raphfrk <raphfrk@gmail.com>
Date: Wed, 2 Mar 2011 20:27:44 +0000
Subject: [PATCH] Regenerate and refresh chunk methods

---
 .../minecraft/server/ChunkProviderServer.java |  4 +-
 .../org/bukkit/craftbukkit/CraftWorld.java    | 92 ++++++++++++++-----
 2 files changed, 71 insertions(+), 25 deletions(-)

diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 86f3d60b0d..a7932c3b8a 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -21,8 +21,8 @@ import org.bukkit.event.world.ChunkUnloadEvent;
 
 public class ChunkProviderServer implements IChunkProvider {
     public LongHashset a = new LongHashset(); // CraftBukkit
-    private Chunk b;
-    private IChunkProvider c;
+    public Chunk b; // CraftBukkit
+    public IChunkProvider c; // CraftBukkit
     private IChunkLoader d;
     public LongHashtable<Chunk> e = new LongHashtable<Chunk>(); // CraftBukkit
     public List f = new ArrayList(); // CraftBukkit
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 9781c48b89..18cbe19fc5 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -149,6 +149,48 @@ public class CraftWorld implements World {
         return true;
     }
 
+    public boolean regenerateChunk(int x, int z) {
+        unloadChunk(x, z, false, false);
+
+        provider.a.remove(x, z);
+
+        net.minecraft.server.Chunk chunk = null;
+
+        if(provider.c == null) {
+            chunk = provider.b;
+        } else {
+            chunk = provider.c.b(x, z);
+        }
+
+        chunkLoadPostProcess(chunk, x, z);
+
+        refreshChunk(x, z);
+
+        return chunk != null;
+    }
+
+    public boolean refreshChunk(int x, int z) {
+        if(!isChunkLoaded(x, z)) {
+            return false;
+        }
+
+        int px = x<<4;
+        int pz = z<<4;
+
+        // If there are more than 10 updates to a chunk at once, it carries out the update as a cuboid
+        // This flags 16 blocks in a line along the bottom for update and then flags a block at the opposite corner at the top
+        // The cuboid that contains these 17 blocks covers the entire chunk
+        // The server will compress the chunk and send it to all clients
+
+        for(int xx = px; xx < (px + 16); xx++) {
+            world.g(xx, 0, pz);
+        }
+        world.g(px, 127, pz+15);
+
+        return true;
+    }
+
+
     public boolean isChunkInUse(int x, int z) {
         Player[] players = server.getOnlinePlayers();
         
@@ -180,33 +222,37 @@ public class CraftWorld implements World {
         if (chunk == null) {
             chunk = provider.e(x, z);
 
-            if (chunk != null) {
-                provider.e.put(x, z, chunk);
-                provider.f.add(chunk);
-
-                chunk.c();
-                chunk.d();
-
-                if (!chunk.n && provider.a(x + 1, z + 1) && provider.a(x, z + 1) && provider.a(x + 1, z)) {
-                    provider.a(provider, x, z);
-                }
-
-                if (provider.a(x - 1, z) && !provider.b(x - 1, z).n && provider.a(x - 1, z + 1) && provider.a(x, z + 1) && provider.a(x - 1, z)) {
-                    provider.a(provider, x - 1, z);
-                }
-
-                if (provider.a(x, z - 1) && !provider.b(x, z - 1).n && provider.a(x + 1, z - 1) && provider.a(x, z - 1) && provider.a(x + 1, z)) {
-                    provider.a(provider, x, z - 1);
-                }
-
-                if (provider.a(x - 1, z - 1) && !provider.b(x - 1, z - 1).n && provider.a(x - 1, z - 1) && provider.a(x, z - 1) && provider.a(x - 1, z)) {
-                    provider.a(provider, x - 1, z - 1);
-                }
-            }
+            chunkLoadPostProcess(chunk, x, z);
         }
         return chunk != null;
     }
 
+    private void chunkLoadPostProcess(net.minecraft.server.Chunk chunk, int x, int z) {
+        if (chunk != null) {
+            provider.e.put(x, z, chunk);
+            provider.f.add(chunk);
+
+            chunk.c();
+            chunk.d();
+
+            if (!chunk.n && provider.a(x + 1, z + 1) && provider.a(x, z + 1) && provider.a(x + 1, z)) {
+                provider.a(provider, x, z);
+            }
+
+            if (provider.a(x - 1, z) && !provider.b(x - 1, z).n && provider.a(x - 1, z + 1) && provider.a(x, z + 1) && provider.a(x - 1, z)) {
+                provider.a(provider, x - 1, z);
+            }
+
+            if (provider.a(x, z - 1) && !provider.b(x, z - 1).n && provider.a(x + 1, z - 1) && provider.a(x, z - 1) && provider.a(x + 1, z)) {
+                provider.a(provider, x, z - 1);
+            }
+
+            if (provider.a(x - 1, z - 1) && !provider.b(x - 1, z - 1).n && provider.a(x - 1, z - 1) && provider.a(x, z - 1) && provider.a(x - 1, z)) {
+                provider.a(provider, x - 1, z - 1);
+            }
+        }
+    }
+
     public boolean isChunkLoaded(Chunk chunk) {
         return isChunkLoaded(chunk.getX(), chunk.getZ());
     }