Difference between revisions of "Pre-release protocol"

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(18w50a, part 1)
(Updated to 1.21-pre2)
 
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−
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.13.2, protocol 404]]) to the current pre-release (currently [[Protocol version numbers|18w50a, protocol 451]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
+
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.20.6, protocol 766]]) to the current pre-release (currently [[Protocol version numbers|1.21-pre2, protocol {{Snapshot PVN|1073742024}}]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
  
 
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
 
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
Line 9: Line 9:
 
=== Data types ===
 
=== Data types ===
  
−
==== Position ====
+
No changes documented so far.
−
 
 
−
64-bit value split in to three parts
 
−
 
 
−
* x: 26 MSBs
 
−
* z: 26 {{change|LSBs|middle bits}}
 
−
* y: 12 {{change|bits between them|LSBs}}
 
−
 
 
−
Encoded as followed:
 
−
 
 
−
((x & 0x3FFFFFF) << 38) | {{change|((y & 0xFFF) << 26) {{!}} (z & 0x3FFFFFF)|((z & 0x3FFFFFF) << 12) {{!}} (y & 0xFFF)}}
 
−
 
 
−
And decoded as:
 
−
 
 
−
val = read_unsigned_long();
 
−
x = val >> 38;
 
−
y = {{change|(val >> 26) & 0xFFF|val & 0xFFF}};
 
−
z = {{change|val << 38 >> 38|(val << 38 >> 38) >> 12}};
 
−
 
 
−
Note: The details of bit shifting are rather language dependent; the above may work in Java but probably won't in other languages without some tweaking. In particular, you will usually receive positive numbers even if the actual coordinates are negative. This can be fixed by adding something like the following:
 
−
 
 
−
if x >= 2^25 { x -= 2^26 }
 
−
if y >= 2^11 { y -= 2^12 }
 
−
if z >= 2^25 { z -= 2^26 }
 
  
 
=== Packets ===
 
=== Packets ===
Line 41: Line 18:
 
  !colspan="2"| Documentation
 
  !colspan="2"| Documentation
 
  |-
 
  |-
−
!colspan="4"| Handshaking serverbound
+
!colspan="4"| Configuration clientbound
−
{{PacketList|0x00|Handshake}}
+
{{PacketList|0x0F|Clientbound Report Details (configuration)|rel=added}}
 +
{{PacketList|0x10|Clientbound Server Links (configuration)|rel=added}}
 
  |-
 
  |-
−
!colspan="4"| Play clientbound
+
!colspan="4"| Play clientbound
−
{{PacketList|0x09|Update Block Entity}}
+
{{PacketList|0x7A|Clientbound Report Details (play)|rel=added}}
−
{{PacketList|0x22|Chunk Data}}
+
{{PacketList|0x7B|Clientbound Server Links (play)|rel=added}}
−
{{PacketList|0x2C|Unknown|rel=added}}
 
−
|colspan="4"|shift of +1 for all I'm not typing right now
 
−
{{PacketList|0x4E|Entity Sound Effect|rel=added}}
 
−
{{PacketList|{{change|0x4E|0x4F}}|Player List Header And Footer|pre=unchanged}}
 
−
{{PacketList|{{change|0x4F|0x50}}|Collect Item|pre=unchanged}}
 
−
{{PacketList|{{change|0x50|0x51}}|Entity Teleport|pre=unchanged}}
 
−
{{PacketList|{{change|0x51|0x52}}|Advancements|pre=unchanged}}
 
−
{{PacketList|{{change|0x52|0x53}}|Entity Properties|pre=unchanged}}
 
−
{{PacketList|{{change|0x53|0x54}}|Entity Effect|pre=unchanged}}
 
−
{{PacketList|{{change|0x54|0x55}}|Declare Recipes|pre=unchanged}}
 
−
{{PacketList|{{change|0x55|0x56}}|Tags}}
 
−
{{PacketList|0x57|Update Light|rel=added}}
 
 
  |-
 
  |-
−
!colspan="4"| Play serverbound
+
|}
−
{{PacketList|0x1B|Recipe Book Data}}
 
−
|}
 
  
−
== New/modified data types ==
+
== Handshake ==
  
 
No changes so far.
 
No changes so far.
  
−
== Entity Metadata ==
+
== Status ==
  
−
=== Mobs ===
+
No changes so far.
  
−
Entity IDs have shifted with the addition of some new mobs.
+
== Login ==
−
 
 
−
=== Arrow ===
 
−
 
 
−
Extends [[#Entity|Entity]].
 
−
 
 
−
Abstract base class for [[#TippedArrow|TippedArrow]] (which is used for regular arrows as well as tipped ones) and Spectral Arrow.
 
−
 
 
−
{| class="wikitable"
 
−
! Index
 
−
! Type
 
−
!style="width: 250px;" colspan="2"| Meaning
 
−
! Default
 
−
|-
 
−
| rowspan="3" | 6
 
−
| rowspan="3" | Byte
 
−
! Bit mask
 
−
! Meaning
 
−
| rowspan="3" | 0
 
−
|-
 
−
| 0x01
 
−
| Is critical
 
−
|-
 
−
| 0x02
 
−
| Is noclip (used by loyalty tridents when returning)
 
−
|-
 
−
| 7
 
−
| OptUUID
 
−
|colspan="2"| Shooter UUID
 
−
| Empty
 
−
|- {{added}}
 
−
| 8
 
−
| Byte
 
−
|colspan="2"| Piercing level
 
−
| 0
 
−
|}
 
−
 
 
−
=== TippedArrow ===
 
−
 
 
−
Extends [[#Arrow|Arrow]].
 
−
 
 
−
Used for both tipped and regular arrows.  If not tipped, then color is set to -1 and no tipped arrow particles are used.
 
−
 
 
−
{| class="wikitable"
 
−
! Index
 
−
! Type
 
−
!style="width: 250px;" colspan="2"| Meaning
 
−
! Default
 
−
|-
 
−
| {{change|8|9}}
 
−
| VarInt
 
−
|colspan="2"| Color (-1 for no particles)
 
−
| -1
 
−
|}
 
−
 
 
−
=== Trident ===
 
−
 
 
−
Extends [[#Arrow|Arrow]].
 
−
 
 
−
{| class="wikitable"
 
−
! Index
 
−
! Type
 
−
!style="width: 250px;" colspan="2"| Meaning
 
−
! Default
 
−
|-
 
−
| {{change|8|9}}
 
−
| VarInt
 
−
|colspan="2"| Loyalty level (enchantment)
 
−
| 0
 
−
|}
 
−
 
 
−
=== Fireworks ===
 
−
 
 
−
Extends [[#Entity|Entity]].
 
−
 
 
−
{| class="wikitable"
 
−
! Index
 
−
! Type
 
−
!style="width: 250px;" colspan="2"| Meaning
 
−
! Default
 
−
|-
 
−
| 6
 
−
| [[Slot]]
 
−
|colspan="2"| Firework info
 
−
| empty
 
−
|-
 
−
| 7
 
−
| {{Change|VarInt|OptUUID}}
 
−
|colspan="2"| Entity {{change|ID|UUID}} of entity which used firework (for elytra boosting)
 
−
| 0
 
−
|- {{Added}}
 
−
| 8
 
−
| Boolean
 
−
|colspan="2"| Shot at angle (from a crossbow)
 
−
| false
 
−
|}
 
−
 
 
−
=== Illager Beast ===
 
−
 
 
−
Extends [[#Monster|Monster]]
 
−
 
 
−
No additional metadata.
 
−
 
 
−
{| class="wikitable" {{added}}
 
−
! Status
 
−
!colspan="2"| Description
 
−
|-
 
−
| 4
 
−
|colspan="2"| Starts the attack animation.
 
−
|-
 
−
| 39
 
−
|colspan="2"| Starts the stun animation.
 
−
|}
 
−
 
 
−
=== Panda ===
 
−
 
 
−
Extends [[#Animal|Animal]].
 
−
 
 
−
{| class="wikitable" {{added}}
 
−
! Index
 
−
! Type
 
−
!style="width: 250px;" colspan="2"| Meaning
 
−
! Default
 
−
|-
 
−
| 13
 
−
| Integer
 
−
|colspan="2"| Breed timer?  Set to 32 when something happens, and then counts down to 0 again.  At 29 and 14 (before counting down), will play the <code>entity.panda.cant_breed</code> sound event.
 
−
| 0
 
−
|-
 
−
| 14
 
−
| Integer
 
−
|colspan="2"| Sneeze timer.  Counts up from 0; when it hits 1 the <code>entity.panda.pre_sneeze</code> event plays and when it hits 21 the <code>entity.panda.sneeze</code> event plays (and it is set back to 0 and the sneeze flag is cleared).
 
−
| 0
 
−
|-
 
−
| 15
 
−
| Integer
 
−
|colspan="2"| Eat timer.  If nonzero, counts upwards.
 
−
| 0
 
−
|-
 
−
| 16
 
−
| Byte
 
−
|colspan="2"| Main Gene
 
−
| 0
 
−
|-
 
−
| 17
 
−
| Byte
 
−
|colspan="2"| Hidden Gene
 
−
| 0
 
−
|-
 
−
|rowspan="6"| 18
 
−
|rowspan="6"| Byte
 
−
! Bit mask
 
−
! Meaning
 
−
|rowspan="6"| 0
 
−
|-
 
−
| 0x01
 
−
| Unused
 
−
|-
 
−
| 0x02
 
−
| Is sneezing
 
−
|-
 
−
| 0x04
 
−
| Is eating
 
−
|-
 
−
| 0x08
 
−
| Unknown
 
−
|-
 
−
| 0x10
 
−
| Unknown
 
−
|}
 
−
 
 
−
=== Pillager ===
 
−
 
 
−
Extends [[#Abstract Illager|Abstract Illlager]].
 
−
 
 
−
{| class="wikitable" {{added}}
 
−
! Index
 
−
! Type
 
−
!style="width: 250px;" colspan="2"| Meaning
 
−
! Default
 
−
|-
 
−
| 13
 
−
| Boolean
 
−
| colspan="2"| Using crossbow
 
−
| false
 
−
|}
 
−
 
 
−
=== Ocelot ===
 
−
 
 
−
Extends {{change|[[#TameableAnimal|TameableAnimal]]|[[#Ageable|Ageable]]}}.
 
−
 
 
−
{| class="wikitable"
 
−
! Index
 
−
! Type
 
−
!style="width: 250px;" colspan="2"| Meaning
 
−
! Default
 
−
|- {{removed}}
 
−
| 15
 
−
| VarInt
 
−
|colspan="2"| Type (0 = untamed, 1 = tuxedo, 2 = tabby, 3 = siamese).  Used to render regardless as to whether it is tamed or not.
 
−
| 0
 
−
|- {{added}}
 
−
| 13
 
−
| Boolean
 
−
|colspan="2"| Is trusting
 
−
| false
 
−
|}
 
−
 
 
−
{| class="wikitable" {{added}}
 
−
! Status
 
−
!colspan="2"| Description
 
−
|-
 
−
| 40
 
−
|colspan="2"| Spawn smoke particles (trust gaining failed)
 
−
|-
 
−
| 41
 
−
|colspan="2"| Spawn heart particles (trust gaining succeeded)
 
−
|}
 
−
 
 
−
=== Cat ===
 
−
 
 
−
Extends [[#TameableAnimal|TameableAnimal]].
 
−
 
 
−
{| class="wikitable" {{added}}
 
−
! Index
 
−
! Type
 
−
!style="width: 250px;" colspan="2"| Meaning
 
−
! Default
 
−
|-
 
−
| 15
 
−
| VarInt
 
−
|colspan="2"| Type (0 = tabby, 1 = black, 2 = red, 3 = siamese, 4 = british_shorthair, 5 = calico, 6 = persian, 7 = ragdoll, 8 = white, 9 = all_black)
 
−
| 1
 
−
|-
 
−
| 16
 
−
| Boolean
 
−
|colspan="2"| Unknown
 
−
| false
 
−
|-
 
−
| 17
 
−
| Boolean
 
−
|colspan="2"| Unknown
 
−
| false
 
−
|-
 
−
| 18
 
−
| VarInt
 
−
|colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
 
−
| 14 (Red)
 
−
|}
 
−
 
 
−
== Block Actions ==
 
  
 
No changes so far.
 
No changes so far.
  
−
== Play ==
+
== Configuration ==
  
 
=== Clientbound ===
 
=== Clientbound ===
  
−
==== Update Block Entity ====
+
==== Clientbound Report Details (configuration) ====
  
−
Sets the block entity associated with the block at the given location.
+
Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
−
  ! Field Name
+
  ! colspan="2"| Field Name
−
  ! Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  |rowspan="3"| 0x09
+
  | rowspan="3"| 0x0F
−
  |rowspan="3"| Play
+
  | rowspan="3"| Configuration
−
  |rowspan="3"| Client
+
  | rowspan="3"| Client
−
  | Location
+
  | colspan="2"| Details Count
−
  | Position
+
  | colspan="2"| {{Type|VarInt}} (32)
−
  |  
+
  | The number of details in the following array.
 
  |-
 
  |-
−
  | Action
+
  | rowspan="2"| Details
−
  | Unsigned Byte
+
| Title
−
  | The type of update to perform, see below
+
| rowspan="2"| {{Type|Array}}
 +
  | {{Type|String}} (128)
 +
  |
 
  |-
 
  |-
−
  | NBT Data
+
  | Description
−
  | [[NBT|NBT Tag]]
+
  | {{Type|String}} (4096)
−
  | Data to set.  May be a TAG_END (0), in which case the block entity at the given location is removed (though this is not required since the client will remove the block entity automatically on chunk unload or block removal)
+
  |
−
|}
+
|}
  
−
''Action'' field:
+
==== Clientbound Server Links (configuration) ====
  
−
* '''1''': Set data of a mob spawner (everything except for SpawnPotentials: current delay, min/max delay, mob to be spawned, spawn count, spawn range, etc.)
+
This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).
−
* '''2''': Set command block text (command and last execution status)
 
−
* '''3''': Set the level, primary, and secondary powers of a beacon
 
−
* '''4''': Set rotation and skin of mob head
 
−
* '''5''': Declare a conduit
 
−
* '''6''': Set base color and patterns on a banner
 
−
* '''7''': Set the data for a Structure tile entity
 
−
* '''8''': Set the destination for a end gateway
 
−
* '''9''': Set the text on a sign
 
−
* '''10''': Declare a shulker box, no data appears to be sent and the client seems to do fine without this packet. Perhaps it is a leftover from earlier versions?
 
−
* '''11''': Declare a bed
 
−
* '''12''': {{Change||Set data of a jigsaw block}}
 
  
−
==== Chunk Data ====
+
{| class="wikitable" {{added}}
−
{{Main|Chunk Format}}
 
−
{{See also|#Unload Chunk}}
 
−
 
 
−
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.  This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with [[#Update Block Entity|Update Block Entity]] later).
 
−
 
 
−
{| class="wikitable"
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
−
  ! Field Name
+
  ! colspan="2"| Field Name
−
  ! Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  |rowspan="9"| 0x22
+
  | rowspan="4"| 0x10
−
  |rowspan="9"| Play
+
  | rowspan="4"| Configuration
−
  |rowspan="9"| Client
+
  | rowspan="4"| Client
−
  | Chunk X
+
  | colspan="2"| Links Count
−
  | Int
+
  | colspan="2"| {{Type|VarInt}}
−
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | The number of links in the following array.
 
  |-
 
  |-
−
  | Chunk Z
+
  | rowspan="3"| Links
−
  | Int
+
| Is built-in
−
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
| rowspan="3"| {{Type|Array}}
 +
  | {{Type|Boolean}}
 +
  | Determines if the following label is built-in (from enum) or custom (text component).
 
  |-
 
  |-
−
  | Ground-Up Continuous
+
  | Label
−
  | Boolean
+
  | {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
−
  | See [[Chunk Format#Ground-up continuous|Chunk Format]]
+
  | See below.
 
  |-
 
  |-
−
  | Primary Bit Mask
+
  | URL
−
  | VarInt
+
  | {{Type|String}}
−
| Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
+
  | Valid URL.
−
|- {{Added}}
+
|}
−
  | Heightmaps
+
 
−
| [[NBT]]
+
 
−
| Compound containing one long array named <code>MOTION_BLOCKING</code>, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry).
+
{| class="wikitable" {{added}}
−
|-
+
  ! ID
−
  | Size
+
  ! Name
−
  | VarInt
+
  ! Notes
−
  | Size of Data in bytes
 
 
  |-
 
  |-
−
  | Data
+
  | 0
−
  | Byte array
+
  | Bug Report
−
  | See [[Chunk Format#Data structure|data structure]] in Chunk Format
+
  | Displayed on connection error screen; included as a comment in the disconnection report.
 
  |-
 
  |-
−
  | Number of block entities
+
  | 1
−
  | VarInt
+
  | Community Guidelines
−
  | Number of elements in the following array
+
  |  
 
  |-
 
  |-
−
  | Block entities
+
  | 2
−
  | Array of [[NBT]]
+
  | Support
−
  | All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
+
  |  
−
|}
 
−
 
 
−
===== Data structure =====
 
−
 
 
−
The data section of the packet contains most of the useful data for the chunk.
 
−
 
 
−
{| class="wikitable"
 
 
  |-
 
  |-
−
  ! Field Name
+
  | 3
−
  ! Field Type
+
  | Status
−
  ! Notes
+
  |
 
  |-
 
  |-
−
  | Data
+
  | 4
−
  | Array of [[#Chunk Section structure|Chunk Section]]
+
  | Feedback
−
  | The number of elements in the array is equal to the number of bits set in Primary Bit Mask. Sections are sent bottom-to-top, i.e. the first section, if sent, extends from Y=0 to Y=15.
+
  |  
 
  |-
 
  |-
−
  | Biomes
+
  | 5
−
  | Optional Int Array
+
  | Community
−
  | Only sent if Ground-Up Continuous is true; 256 entries if present
+
  |  
−
|}
 
−
 
 
−
===== Chunk Section structure =====
 
−
 
 
−
A Chunk Section is defined in terms of other [[data types]]. A Chunk Section consists of the following fields:
 
−
 
 
−
{| class="wikitable"
 
 
  |-
 
  |-
−
! Field Name
+
  | 6
−
! Field Type
+
  | Website
−
! Notes
+
  |  
−
  |- {{added}}
 
−
  | Block count
 
−
  | Short
 
−
| Number of non-air blocks present in the chunk section, for lighting purposes.  "Non-air" is defined as any block other than air, cave air, and void air (in particular, note that fluids such as water are still counted).
 
 
  |-
 
  |-
−
  | Bits Per Block
+
  | 7
−
  | Unsigned Byte
+
  | Forums
−
  | Determines how many bits are used to encode a block. Note that not all numbers are valid here.
+
  |  
 
  |-
 
  |-
−
  | Palette
+
  | 8
−
  | Varies
+
  | News
−
  | See below for the format.
+
  |  
 
  |-
 
  |-
−
  | Data Array Length
+
  | 9
−
  | VarInt
+
  | Announcements
−
  | Number of longs in the following array
+
  |  
 
  |-
 
  |-
−
| Data Array
 
−
| Array of Long
 
−
| Compacted list of 4096 indices pointing to state IDs in the Palette
 
−
|- {{removed}}
 
−
| Block Light
 
−
| Byte Array
 
−
| Half byte per block
 
−
|- {{removed}}
 
−
| Sky Light
 
−
| Optional Byte Array
 
−
| Only if in the Overworld; half byte per block
 
 
  |}
 
  |}
  
−
Data Array{{change|, Block Light, and Sky Light are|is}} given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates. {{change|For the half-byte light arrays, even-indexed items (those with an even x coordinate, starting at 0) are packed into the ''low bits'', odd-indexed into the ''high bits''.}}
+
=== Serverbound ===
 +
 
 +
No changes so far.
  
−
==== Unknown ====
+
== Play ==
  
−
{| class="wikitable" {{Added}}
+
=== Clientbound ===
−
! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
−
|-
 
−
|rowspan="1"| 0x2C
 
−
|rowspan="1"| Play
 
−
|rowspan="1"| Client
 
−
| Unknown
 
−
| VarInt enum
 
−
|
 
−
|}
 
  
−
==== Entity Sound Effect ====
+
==== Clientbound Report Details (play) ====
  
−
Plays a sound effect from an entity.
+
Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
−
  ! Field Name
+
  ! colspan="2"| Field Name
−
  ! Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  |rowspan="5"| 0x4E
+
  | rowspan="3"| 0x7A
−
  |rowspan="5"| Play
+
  | rowspan="3"| Configuration
−
  |rowspan="5"| Client
+
  | rowspan="3"| Client
−
  | Sound ID
+
  | colspan="2"| Details Count
−
  | VarInt
+
  | colspan="2"| {{Type|VarInt}} (32)
−
  | ID of hardcoded sound event ([https://pokechu22.github.io/Burger/18w48a.html#sounds events] as of 18w48a)
+
  | The number of details in the following array.
 
  |-
 
  |-
−
  | Sound Category
+
  | rowspan="2"| Details
−
  | VarInt Enum
+
  | Title
−
  | The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories])
+
| rowspan="2"| {{Type|Array}}
 +
  | {{Type|String}} (128)
 +
|
 
  |-
 
  |-
−
  | Entity ID
+
  | Description
−
  | VarInt
+
  | {{Type|String}} (4096)
 
  |
 
  |
−
|-
+
|}
−
| Volume
 
−
| Float
 
−
| 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients
 
−
|-
 
−
| Pitch
 
−
| Float
 
−
| Float between 0.5 and 2.0 by Notchian clients
 
−
|}
 
  
−
==== Tags ====
+
==== Clientbound Server Links (play) ====
  
−
{| class="wikitable"
+
This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).
−
! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
−
|-
 
−
|rowspan="4"| {{Change|0x55|0x56}}
 
−
|rowspan="4"| Play
 
−
|rowspan="4"| Client
 
−
| Block Tags
 
−
| (See below)
 
−
| IDs are block IDs
 
−
|-
 
−
| Item Tags
 
−
| (See below)
 
−
| IDs are item IDs
 
−
|-
 
−
| Fluid Tags
 
−
| (See below)
 
−
| IDs are fluid IDs
 
−
|- {{added}}
 
−
| Entity Tags
 
−
| (See below)
 
−
| IDs are entity type IDs
 
−
|}
 
  
−
==== Update Light ====
+
{| class="wikitable" {{added}}
−
 
 
−
Updates light levels for a chunk.
 
−
 
 
−
{| class="wikitable"
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
−
  ! Field Name
+
  ! colspan="2"| Field Name
−
  ! Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  |rowspan="8"| 0x57
+
  | rowspan="4"| 0x7B
−
  |rowspan="8"| Play
+
  | rowspan="4"| Configuration
−
  |rowspan="8"| Client
+
  | rowspan="4"| Client
−
  | Chunk X
+
  | colspan="2"| Links Count
−
  | VarInt
+
  | colspan="2"| {{Type|VarInt}}
−
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | The number of links in the following array.
 
  |-
 
  |-
−
  | Chunk Z
+
  | rowspan="3"| Links
−
  | VarInt
+
| Is built-in
−
  | Chunk coordinate (block coordinate divided by 16, rounded down)  
+
| rowspan="3"| {{Type|Array}}
 +
  | {{Type|Boolean}}
 +
  | Determines if the following label is built-in (from enum) or custom (text component).
 
  |-
 
  |-
−
  | Sky Light Mask
+
  | Label
−
  | VarInt
+
  | {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
−
  | Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
+
  | See below.
 
  |-
 
  |-
−
  | Block Light Mask
+
  | URL
−
  | VarInt
+
  | {{Type|String}}
−
| Mask containing 18 bits, with the same order as sky light
+
  | Valid URL.
−
|-
+
|}
−
| Empty Sky Light Mask
 
−
| VarInt
 
−
| Mask containing 18 bits, which indicates sections that have 0 for all their sky light values.  If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the sky light arrays.
 
−
|-
 
−
| Empty Block Light Mask
 
−
| VarInt
 
−
  | Mask containing 18 bits, which indicates sections that have 0 for all their block light values.  If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the block light arrays.
 
−
|-
 
−
| Sky Light arrays
 
−
| Array of arrays of 2048 bytes
 
−
| There is 1 array for each bit set to true in the sky light mask, starting with the lowest value.  Half a byte per light value.
 
−
|-
 
−
| Block Light arrays
 
−
| Array of arrays of 2048 bytes
 
−
| There is 1 array for each bit set to true in the block light mask, starting with the lowest value.  Half a byte per light value.
 
−
|}
 
  
−
Individual block or sky light arrays are is given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates. Even-indexed items (those with an even x coordinate, starting at 0) are packed into the low bits, odd-indexed into the high bits.
+
{| class="wikitable" {{added}}
−
 
+
  ! ID
−
=== Serverbound ===
+
  ! Name
−
 
 
−
==== Recipe Book Data ====
 
−
 
 
−
{| class="wikitable"
 
−
  ! Packet ID
 
−
  ! State
 
−
! Bound To
 
−
!colspan="2"| Field Name
 
−
! Field Type
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  |rowspan="7"| 0x1B
+
  | 0
−
|rowspan="7"| Play
+
  | Bug Report
−
  |rowspan="7"| Server
+
  | Displayed on connection error screen; included as a comment in the disconnection report.
−
  |colspan="2"| Type
 
−
| VarInt
 
−
| Determines the format of the rest of the packet
 
 
  |-
 
  |-
−
  ! Type
+
  | 1
−
  ! Field Name
+
  | Community Guidelines
−
  !
+
  |
−
!
 
 
  |-
 
  |-
−
  | 0: Displayed Recipe
+
  | 2
−
  | Recipe ID
+
  | Support
−
  | Identifier
+
  |  
−
| A recipe ID
 
 
  |-
 
  |-
−
  |rowspan="4"| 1: Recipe Book States
+
  | 3
−
  | Crafting Recipe Book Open
+
| Status
−
  | Boolean
+
|
−
  | Whether the player has the crafting recipe book currently opened/active.
+
|-
 +
  | 4
 +
  | Feedback
 +
  |  
 
  |-
 
  |-
−
  | Crafting Recipe Filter Active
+
  | 5
−
  | Boolean
+
  | Community
−
  | Whether the player has the crafting recipe book filter option currently active.
+
  |  
 
  |-
 
  |-
−
  | Smelting Recipe Book Open
+
  | 6
−
  | Boolean
+
  | Website
−
  | Whether the player has the smelting recipe book currently opened/active.
+
  |  
 
  |-
 
  |-
−
  | Smelting Recipe Filter Active
+
  | 7
−
  | Boolean
+
  | Forums
−
  | Whether the player has the smelting recipe book filter option currently active.
+
  |  
−
|- {{Added}}
 
−
| Unknown 1
 
−
| Boolean
 
−
| (may actually be above and some of the other things have shifted)
 
−
|- {{Added}}
 
−
| Unknown 2
 
−
| Boolean
 
−
| (may actually be above and some of the other things have shifted)
 
−
|- {{Added}}
 
−
| Unknown 3
 
−
| Boolean
 
−
| (may actually be above and some of the other things have shifted)
 
−
|- {{Added}}
 
−
| Unknown 4
 
−
| Boolean
 
−
| (may actually be above and some of the other things have shifted)
 
−
|}
 
−
 
 
−
The Recipe Book Status type is sent when one of the states changes.
 
−
 
 
−
== Handshaking ==
 
−
 
 
−
=== Clientbound ===
 
−
 
 
−
There are no clientbound packets in the Handshaking state, since the protocol immediately switches to a different state after the client sends the first packet.
 
−
 
 
−
=== Serverbound ===
 
−
 
 
−
==== Handshake ====
 
−
 
 
−
This causes the server to switch into the target state.
 
−
 
 
−
{| class="wikitable"
 
−
! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
 
  |-
 
  |-
−
  |rowspan="4"| 0x00
+
  | 8
−
|rowspan="4"| Handshaking
+
  | News
−
|rowspan="4"| Server
+
  |  
−
  | Protocol Version
 
−
  | VarInt
 
−
| See [[protocol version numbers]] (currently {{change|404|451}})
 
 
  |-
 
  |-
−
  | Server Address
+
  | 9
−
  | String
+
  | Announcements
−
  | Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect.  The Notchian server does not use this information.
+
  |  
−
|-
 
−
| Server Port
 
−
| Unsigned Short
 
−
| Default is 25565.  The Notchian server does not use this information.
 
 
  |-
 
  |-
−
| Next State
 
−
| VarInt Enum
 
−
| 1 for [[#Status|status]], 2 for [[#Login|login]]
 
 
  |}
 
  |}
−
 
−
== Status ==
 
−
 
−
=== Clientbound ===
 
−
 
−
No changes so far.
 
  
 
=== Serverbound ===
 
=== Serverbound ===
  
 
No changes so far.
 
No changes so far.
−
 
−
== Login ==
 
−
 
−
=== Clientbound ===
 
−
 
−
No changes so far.
 
−
 
−
=== Serverbound ===
 
−
 
−
No changes so far.
 
−
 
  
 
[[Category:Minecraft Modern]]
 
[[Category:Minecraft Modern]]

Latest revision as of 10:40, 8 June 2024

This page documents the changes from the last stable Minecraft release (currently 1.20.6, protocol 766) to the current pre-release (currently 1.21-pre2, protocol Snapshot 200). Note that this page contains bleeding-edge information that may not be completely or correctly documented.

One who wishes to commandeer the merging of this into Protocol when an update is made must be sure to respect any changes that may have occurred to the respective packets there.

Contents

Data types

No changes documented so far.

Packets

ID Packet name Documentation
Configuration clientbound
0x0F Clientbound Report Details (configuration) Pre
0x10 Clientbound Server Links (configuration) Pre
Play clientbound
0x7A Clientbound Report Details (play) Pre
0x7B Clientbound Server Links (play) Pre

Handshake

No changes so far.

Status

No changes so far.

Login

No changes so far.

Configuration

Clientbound

Clientbound Report Details (configuration)

Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.

Packet ID State Bound To Field Name Field Type Notes
0x0F Configuration Client Details Count VarInt (32) The number of details in the following array.
Details Title Array String (128)
Description String (4096)

Clientbound Server Links (configuration)

This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).

Packet ID State Bound To Field Name Field Type Notes
0x10 Configuration Client Links Count VarInt The number of links in the following array.
Links Is built-in Array Boolean Determines if the following label is built-in (from enum) or custom (text component).
Label VarInt Enum / Text Component See below.
URL String Valid URL.


ID Name Notes
0 Bug Report Displayed on connection error screen; included as a comment in the disconnection report.
1 Community Guidelines
2 Support
3 Status
4 Feedback
5 Community
6 Website
7 Forums
8 News
9 Announcements

Serverbound

No changes so far.

Play

Clientbound

Clientbound Report Details (play)

Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.

Packet ID State Bound To Field Name Field Type Notes
0x7A Configuration Client Details Count VarInt (32) The number of details in the following array.
Details Title Array String (128)
Description String (4096)

Clientbound Server Links (play)

This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).

Packet ID State Bound To Field Name Field Type Notes
0x7B Configuration Client Links Count VarInt The number of links in the following array.
Links Is built-in Array Boolean Determines if the following label is built-in (from enum) or custom (text component).
Label VarInt Enum / Text Component See below.
URL String Valid URL.
ID Name Notes
0 Bug Report Displayed on connection error screen; included as a comment in the disconnection report.
1 Community Guidelines
2 Support
3 Status
4 Feedback
5 Community
6 Website
7 Forums
8 News
9 Announcements

Serverbound

No changes so far.

Retrieved from "https://wiki.vg/index.php?title=Pre-release_protocol&oldid=19307"