[Bleeding] Prevent update inconsistencies on generation/decoration that span chunks. Fixes BUKKIT-871

src/main/java/net/minecraft/server/Chunk.java

@@ -30,6 +30,7 @@ public class Chunk {
     public long n;
     private int s;
     boolean o;
+    public boolean sentToClient; // CraftBukkit - flag if chunk has been seen
 
     public Chunk(World world, int i, int j) {
         this.sections = new ChunkSection[16];

src/main/java/net/minecraft/server/ChunkProviderFlat.java

@@ -51,6 +51,13 @@ public class ChunkProviderFlat implements IChunkProvider {
         if (this.c) {
             this.d.a(this, this.a, i, j, abyte);
         }
+        // CraftBukkit start - prime biome data to prevent uninitialized values racing to client
+        BiomeBase[] bb = this.a.getWorldChunkManager().getBiomeBlock(null, i * 16, j * 16, 16, 16);
+        byte[] biomes = chunk.l();
+        for(int idx = 0; idx < biomes.length; idx++) {
+            biomes[idx] = (byte) bb[idx].id;
+        }
+        // CraftBukkit end
 
         chunk.initLighting();
         return chunk;

src/main/java/net/minecraft/server/ChunkProviderHell.java

@@ -192,6 +192,13 @@ public class ChunkProviderHell implements IChunkProvider {
         this.t.a(this, this.o, i, j, abyte);
         this.c.a(this, this.o, i, j, abyte);
         Chunk chunk = new Chunk(this.o, abyte, i, j);
+        // CraftBukkit start - prime biome data to prevent uninitialized values racing to client
+        BiomeBase[] bb = this.o.getWorldChunkManager().getBiomeBlock(null, i * 16, j * 16, 16, 16);
+        byte[] biomes = chunk.l();
+        for(int idx = 0; idx < biomes.length; idx++) {
+            biomes[idx] = (byte) bb[idx].id;
+        }
+        // CraftBukkit end
 
         chunk.m();
         return chunk;

src/main/java/net/minecraft/server/ChunkProviderTheEnd.java

@@ -142,6 +142,13 @@ public class ChunkProviderTheEnd implements IChunkProvider {
         this.b(i, j, abyte, this.o);
         Chunk chunk = new Chunk(this.m, abyte, i, j);
 
+        // CraftBukkit start - prime biome data to prevent uninitialized values racing to client
+        byte[] biomes = chunk.l();
+        for(int idx = 0; idx < biomes.length; idx++) {
+            biomes[idx] = (byte) this.o[idx].id;
+        }
+        // CraftBukkit end
+
         chunk.initLighting();
         return chunk;
     }

src/main/java/net/minecraft/server/Packet51MapChunk.java

@@ -31,6 +31,7 @@ public class Packet51MapChunk extends Packet {
         this.f = flag;
         if (flag) {
             i = '\uffff';
+            chunk.sentToClient = true; // CraftBukkit - flag as seen
         }
 
         ChunkSection[] achunksection = chunk.h();

src/main/java/net/minecraft/server/WorldGenForest.java

@@ -60,7 +60,7 @@ public class WorldGenForest extends WorldGenerator implements BlockSapling.TreeG
             } else {
                 i1 = world.getTypeId(i, j - 1, k);
                 if ((i1 == Block.GRASS.id || i1 == Block.DIRT.id) && j < 256 - l - 1) {
-                    world.setRawTypeId(i, j - 1, k, Block.DIRT.id);
+                    this.setTypeAndData(world, i, j - 1, k, Block.DIRT.id, 0); // CraftBukkit
 
                     int i2;
 

src/main/java/net/minecraft/server/WorldGenGroundBush.java

@@ -31,7 +31,7 @@ public class WorldGenGroundBush extends WorldGenerator implements BlockSapling.T
 
         if (i1 == Block.DIRT.id || i1 == Block.GRASS.id) {
             ++j;
-            world.setRawTypeIdAndData(i, j, k, Block.LOG.id, this.b);
+            this.setTypeAndData(world, i, j, k, Block.LOG.id, this.b); // CraftBukkit
 
             for (int j1 = j; j1 <= j + 2; ++j1) {
                 int k1 = j1 - j;

src/main/java/net/minecraft/server/WorldGenSwampTree.java

@@ -59,7 +59,7 @@ public class WorldGenSwampTree extends WorldGenerator  implements BlockSapling.T
             } else {
                 i1 = world.getTypeId(i, j - 1, k);
                 if ((i1 == Block.GRASS.id || i1 == Block.DIRT.id) && j < 128 - l - 1) {
-                    world.setRawTypeId(i, j - 1, k, Block.DIRT.id);
+                    this.setTypeAndData(world, i, j - 1, k, Block.DIRT.id, 0); // CraftBukkit
 
                     int i2;
                     int j2;
@@ -75,7 +75,7 @@ public class WorldGenSwampTree extends WorldGenerator  implements BlockSapling.T
                                 int l2 = k2 - k;
 
                                 if ((Math.abs(i2) != k1 || Math.abs(l2) != k1 || random.nextInt(2) != 0 && j1 != 0) && !Block.n[world.getTypeId(l1, j2, k2)]) {
-                                    world.setRawTypeId(l1, j2, k2, Block.LEAVES.id);
+                                    this.setTypeAndData(world, l1, j2, k2, Block.LEAVES.id, 0); // CraftBukkit
                                 }
                             }
                         }
@@ -84,7 +84,7 @@ public class WorldGenSwampTree extends WorldGenerator  implements BlockSapling.T
                     for (j2 = 0; j2 < l; ++j2) {
                         j1 = world.getTypeId(i, j + j2, k);
                         if (j1 == 0 || j1 == Block.LEAVES.id || j1 == Block.WATER.id || j1 == Block.STATIONARY_WATER.id) {
-                            world.setRawTypeId(i, j + j2, k, Block.LOG.id);
+                            this.setTypeAndData(world, i, j + j2, k, Block.LOG.id, 0); // CraftBukkit
                         }
                     }
 
@@ -126,7 +126,7 @@ public class WorldGenSwampTree extends WorldGenerator  implements BlockSapling.T
     }
 
     private void a(org.bukkit.BlockChangeDelegate world, int i, int j, int k, int l) { // CraftBukkit - change signature
-        world.setTypeIdAndData(i, j, k, Block.VINE.id, l);
+        this.setTypeAndData(world, i, j, k, Block.VINE.id, l); // CraftBukkit
         int i1 = 4;
 
         while (true) {
@@ -135,7 +135,7 @@ public class WorldGenSwampTree extends WorldGenerator  implements BlockSapling.T
                 return;
             }
 
-            world.setTypeIdAndData(i, j, k, Block.VINE.id, l);
+            this.setTypeAndData(world, i, j, k, Block.VINE.id, l); // CraftBukkit
             --i1;
         }
     }

src/main/java/net/minecraft/server/WorldGenTaiga1.java

@@ -60,7 +60,7 @@ public class WorldGenTaiga1 extends WorldGenerator implements BlockSapling.TreeG
             } else {
                 l1 = world.getTypeId(i, j - 1, k);
                 if ((l1 == Block.GRASS.id || l1 == Block.DIRT.id) && j < 128 - l - 1) {
-                    world.setRawTypeId(i, j - 1, k, Block.DIRT.id);
+                    this.setTypeAndData(world, i, j - 1, k, Block.DIRT.id, 0); // CraftBukkit
                     l2 = 0;
 
                     for (i2 = j + l; i2 >= j + i1; --i2) {
@@ -71,7 +71,7 @@ public class WorldGenTaiga1 extends WorldGenerator implements BlockSapling.TreeG
                                 int j3 = i3 - k;
 
                                 if ((Math.abs(k2) != l2 || Math.abs(j3) != l2 || l2 <= 0) && !Block.n[world.getTypeId(j2, i2, i3)]) {
-                                    world.setRawTypeIdAndData(j2, i2, i3, Block.LEAVES.id, 1);
+                                    this.setTypeAndData(world, j2, i2, i3, Block.LEAVES.id, 1); // CraftBukkit
                                 }
                             }
                         }
@@ -86,7 +86,7 @@ public class WorldGenTaiga1 extends WorldGenerator implements BlockSapling.TreeG
                     for (i2 = 0; i2 < l - 1; ++i2) {
                         j2 = world.getTypeId(i, j + i2, k);
                         if (j2 == 0 || j2 == Block.LEAVES.id) {
-                            world.setRawTypeIdAndData(i, j + i2, k, Block.LOG.id, 1);
+                            this.setTypeAndData(world, i, j + i2, k, Block.LOG.id, 1); // CraftBukkit
                         }
                     }
 

src/main/java/net/minecraft/server/WorldGenTaiga2.java

@@ -61,7 +61,7 @@ public class WorldGenTaiga2 extends WorldGenerator implements BlockSapling.TreeG
             } else {
                 l1 = world.getTypeId(i, j - 1, k);
                 if ((l1 == Block.GRASS.id || l1 == Block.DIRT.id) && j < 256 - l - 1) {
-                    world.setRawTypeId(i, j - 1, k, Block.DIRT.id);
+                    this.setTypeAndData(world, i, j - 1, k, Block.DIRT.id, 0); // CraftBukkit
                     k2 = random.nextInt(2);
                     i2 = 1;
                     byte b0 = 0;

src/main/java/net/minecraft/server/WorldGenTrees.java

@@ -72,7 +72,7 @@ public class WorldGenTrees extends WorldGenerator implements BlockSapling.TreeGe
             } else {
                 i1 = world.getTypeId(i, j - 1, k);
                 if ((i1 == Block.GRASS.id || i1 == Block.DIRT.id) && j < 256 - l - 1) {
-                    world.setRawTypeId(i, j - 1, k, Block.DIRT.id);
+                    this.setTypeAndData(world, i, j - 1, k, Block.DIRT.id, 0); // CraftBukkit
                     b0 = 3;
                     byte b1 = 0;
 
@@ -162,7 +162,7 @@ public class WorldGenTrees extends WorldGenerator implements BlockSapling.TreeGe
 
     // CraftBukkit - Changed world to BlockChangeDelegate
     private void a(BlockChangeDelegate world, int i, int j, int k, int l) {
-        world.setTypeIdAndData(i, j, k, Block.VINE.id, l);
+        this.setTypeAndData(world, i, j, k, Block.VINE.id, l); // CraftBukkit
         int i1 = 4;
 
         while (true) {
@@ -171,7 +171,7 @@ public class WorldGenTrees extends WorldGenerator implements BlockSapling.TreeGe
                 return;
             }
 
-            world.setTypeIdAndData(i, j, k, Block.VINE.id, l);
+            this.setTypeAndData(world, i, j, k, Block.VINE.id, l); // CraftBukkit
             --i1;
         }
     }

src/main/java/net/minecraft/server/WorldGenerator.java

@@ -24,6 +24,13 @@ public abstract class WorldGenerator {
     protected void setTypeAndData(BlockChangeDelegate world, int i, int j, int k, int l, int i1) {
         if (this.a) {
             world.setTypeIdAndData(i, j, k, l, i1);
+        // CraftBukkit start - do equiv of setTypeIdAndData, but skip doing physics to prevent fades
+        }
+        else if ((world instanceof World) && ((World) world).getChunkAt(i >> 4, k >> 4).sentToClient) {
+            if (world.setRawTypeIdAndData(i, j, k, l, i1)) {
+                ((World) world).notify(i, j, k);
+            }
+        // CraftBukkt end
         } else {
             world.setRawTypeIdAndData(i, j, k, l, i1);
         }