Create an index of interesting blocks

protocol/packets.py

@@ -10,6 +10,8 @@ from minecraft.networking.types import (
 
 from protocol.types import Nbt, Slot, Entry
 
+import blocks
+
 
 class ChunkDataPacket(Packet):
     id = 0x20
@@ -75,6 +77,7 @@ class Chunk:
         self.z = z
         self.empty = empty
         self.entities = []
+        self.sub_index = {}
 
     def __repr__(self):
         return 'Chunk(%r, %r, %r)' % (self.x, self.y, self.z)
@@ -111,6 +114,11 @@ class Chunk:
                 n = self.palette[n]
             self.blocks.append(n)
 
+            if n in blocks.INDEXED_IDS:
+                if n not in self.sub_index:
+                    self.sub_index[n] = []
+                self.sub_index[n].append(i)
+
     def write_fields(self, packet_buffer):
         pass # TODO