exchange block updates with clients

[blank.git] / doc / protocol

diff --git a/doc/protocol b/doc/protocol
index 432a3e9413d6604e75808424ab35bb29fd7bdf96..3347158e516ff7b567dbd101e65535d7213f3378 100644 (file)
--- a/doc/protocol
+++ b/doc/protocol
@@ -17,6 +17,15 @@ with native LE (or BE if the server and all clients are on that,
 but that's by accident and will break if conversion code is ever
 added)
 
+Common Types
+------------
+
+Name          Size  Type
+vec3          12    3x 32bit float
+vec3i         12    3x 32bit signed int
+quat          16    4x 32bit float
+entity state  64    vec3i, vec3, vec3, quat, vec3
+
 
 Packets
 =======
@@ -56,8 +65,7 @@ it's changing worlds.
 Code: 2
 Payload:
         0 entity ID of the player, 32bit unsigned int
-        4 chunk coords of the player, 3x 32bit signed int
-       16 pos/vel/rot/ang of the player, 13x 32bit float
+        4 entity state of the player
        68 name of the world the server's currently running
           max 32 byte UTF-8 string
 Length: 68-100
@@ -82,9 +90,13 @@ Sent by clients to notify the server of their changes to the player.
 
 Code: 4
 Payload:
-        0 chunk coords of the player, 3x 32bit signed int
-       12 pos/vel/rot/ang of the player, 13x 32bit float
-Length: 64
+        0 player's entity state as predicted by the client
+       64 movement input, 3x 16bit signed int, each component mapped from [-1,1] to [-32767,32767]
+       70 pitch input, 16bit signed int, mapped from [-PI/2,PI/2] to [-32767,32767]
+       72 yaw input, 16bit signed int, mapped from [-PI,PI] to [-32767,32767]
+       74 active actions, 8bit bit field, first three bits are primary, secondary, and tertiary
+       75 selected inventory slot, 8bit unsigned int
+Length: 76
 
 
 Spawn Entity
@@ -96,13 +108,12 @@ Code: 5
 Payload:
          0 entity ID, 32bit unsigned int
          4 entity's skeleton ID, 32bit unsigned int
-         8 chunk coords of the entity, 3x 32bit signed int
-        20 pos/vel/rot/ang of the entity, 13x 32bit float
+         8 entity state
         72 bounding box of the entity, 6x 32bit float
         96 flags, 32bit bitfield with boolean values
            1: world collision
        100 entity name, max 32 byte UTF-8 string
-Length: 132
+Length: 100 - 132
 
 
 Despawn Entity
@@ -125,7 +136,63 @@ Contained entities must be ordered by ascending entity ID.
 Code: 7
 Payload:
         0 number of entities, 32bit int, 1-7
-        4 chunk coords of the entity, 3x 32bit signed int
-       16 pos/vel/rot/ang of the entity, 13x 32bit float
-       68 next entity...
-Length: 4 + multiple of 64, max 452
+        4 entity ID, 32bit unsigned int
+        8 entity state
+       72 next entity...
+Length: 4 + multiple of 68, max 480
+
+
+Player Correction
+-----------------
+
+Sent by the server to tell a client that its prediction is way off.
+
+Code: 8
+Payload:
+        0 sequence number of the offending packet, 16bit unsigned int
+        2 entity state of the player's entity on the server
+Length: 66
+
+
+Chunk Begin
+-----------
+
+Sent by the server to inform the client of an upcoming chunk transmission.
+
+Code: 9
+Payload:
+        0 transmission ID, used for reference with Chunk Data packets, 32bit unsigned int
+        4 flags, 32bit bitfield with boolean values
+          1: compressed
+        8 chunk coordinates, vec3i
+       20 data size, 32bit unsigned int
+Length: 24
+
+
+Chunk Data
+----------
+
+Raw chunk data sent by the server, optionally compressed with zlib.
+
+Code: 10
+Payload:
+        0 transmission ID, references the Chunk Begin packet this data belongs to, 32bit unsigned int
+        4 block offset, offset of this block inside the whole data, 32bit unsigned int
+        8 block size, size of the data block, 32bit unsigned int
+       12 data, raw data
+Length: 12-484
+
+
+Block Update
+------------
+
+Sent by the server whenever one or more block in a chunk have changed.
+
+Code: 11
+Payload:
+        0 chunk coordinates, vec3i
+       12 number of blocks, 32bit unsigned int, 1-78
+       16 first block index, 16bit unsigned int
+       18 first block data, 32bit
+       22 second block index...
+Length: 16 + multiple of 6, max 484