Difference between revisions of "Pre-release protocol"

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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|19w06a, protocol 459]]). 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|1.16.5, protocol 754]]) to the current pre-release (currently [[Protocol version numbers|21w07a, protocol {{Snapshot PVN|1073741839}}]]). 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 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 40: Line 17:
 
  ! Packet name
 
  ! Packet name
 
  !colspan="2"| Documentation
 
  !colspan="2"| Documentation
|-
 
!colspan="4"| Handshaking serverbound
 
{{PacketList|0x00|Handshake}}
 
 
  |-
 
  |-
 
!colspan="4"| Play clientbound
 
!colspan="4"| Play clientbound
{{PacketList|0x00|Spawn Object}}
+
{{PacketList|0x05|Sculk Vibration Signal|rel=added}}
{{PacketList|0x09|Update Block Entity}}
+
{{PacketList|{{change|0x05|0x06}}|Entity Animation (clientbound)|pre=unchanged}}
{{PacketList|0x14|Open Horse Window|rel=added}}
+
{{PacketList|{{change|0x06|0x07}}|Statistics|pre=unchanged}}
{{PacketList|0x22|Chunk Data}}
+
{{PacketList|{{change|0x07|0x08}}|Acknowledge Player Digging|pre=unchanged}}
{{PacketList|0x26|Map Data}}
+
{{PacketList|{{change|0x08|0x09}}|Block Break Animation|pre=unchanged}}
{{PacketList|0x2C|Open Book|rel=added}}
+
{{PacketList|{{change|0x09|0x0A}}|Block Entity Data|pre=unchanged}}
{{PacketList|{{change|0x2C|0x2D}}|Open Sign Editor|pre=unchanged}}
+
{{PacketList|{{change|0x0A|0x0B}}|Block Action|pre=unchanged}}
{{PacketList|{{change|0x2D|0x2E}}|Craft Recipe Response|pre=unchanged}}
+
{{PacketList|{{change|0x0B|0x0C}}|Block Change|pre=unchanged}}
{{PacketList|{{change|0x2E|0x2F}}|Player Abilities (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x0C|0x0D}}|Boss Bar|pre=unchanged}}
{{PacketList|{{change|0x2F|0x30}}|Combat Event|pre=unchanged}}
+
{{PacketList|{{change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
{{PacketList|{{change|0x30|0x31}}|Player List Item|pre=unchanged}}
+
{{PacketList|{{change|0x0E|0x0F}}|Chat Message (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x31|0x32}}|Face Player|pre=unchanged}}
+
{{PacketList|{{change|0x0F|0x10}}|Tab-Complete (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x32|0x33}}|Player Position And Look (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x10|0x11}}|Declare Commands|pre=unchanged}}
{{PacketList|{{change|0x33|0x34}}|Use Bed|pre=unchanged}}
+
{{PacketList|{{change|0x11|0x12}}|Window Confirmation (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x34|0x35}}|Unlock Recipes|pre=unchanged}}
+
{{PacketList|{{change|0x12|0x13}}|Close Window (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x35|0x36}}|Destroy Entities|pre=unchanged}}
+
{{PacketList|{{change|0x13|0x14}}|Window Items|pre=unchanged}}
{{PacketList|{{change|0x36|0x37}}|Remove Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x14|0x15}}|Window Property|pre=unchanged}}
{{PacketList|{{change|0x37|0x38}}|Resource Pack Send|pre=unchanged}}
+
{{PacketList|{{change|0x15|0x16}}|Set Slot|pre=unchanged}}
{{PacketList|{{change|0x38|0x39}}|Respawn|pre=unchanged}}
+
{{PacketList|{{change|0x16|0x17}}|Set Cooldown|pre=unchanged}}
{{PacketList|{{change|0x39|0x3A}}|Entity Head Look|pre=unchanged}}
+
{{PacketList|{{change|0x17|0x18}}|Plugin Message (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x3A|0x3B}}|Select Advancement Tab|pre=unchanged}}
+
{{PacketList|{{change|0x18|0x19}}|Named Sound Effect|pre=unchanged}}
{{PacketList|{{change|0x3B|0x3C}}|World Border|pre=unchanged}}
+
{{PacketList|{{change|0x19|0x1A}}|Disconnect (play)|pre=unchanged}}
{{PacketList|{{change|0x3C|0x3D}}|Camera|pre=unchanged}}
+
{{PacketList|{{change|0x1A|0x1B}}|Entity Status|pre=unchanged}}
{{PacketList|{{change|0x3D|0x3E}}|Held Item Change (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x1B|0x1C}}|Explosion|pre=unchanged}}
{{PacketList|{{change|0x3E|0x3F}}|Display Scoreboard|pre=unchanged}}
+
{{PacketList|{{change|0x1C|0x1D}}|Unload Chunk|pre=unchanged}}
{{PacketList|{{change|0x3F|0x40}}|Entity Metadata|pre=unchanged}}
+
{{PacketList|{{change|0x1D|0x1E}}|Change Game State|pre=unchanged}}
{{PacketList|{{change|0x40|0x41}}|Attach Entity|pre=unchanged}}
+
{{PacketList|{{change|0x1E|0x1F}}|Open Horse Window|pre=unchanged}}
{{PacketList|{{change|0x41|0x42}}|Entity Velocity|pre=unchanged}}
+
{{PacketList|{{change|0x1F|0x20}}|Keep Alive (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x42|0x43}}|Entity Equipment|pre=unchanged}}
+
{{PacketList|{{change|0x20|0x21}}|Chunk Data}}
{{PacketList|{{change|0x43|0x44}}|Set Experience|pre=unchanged}}
+
{{PacketList|{{change|0x21|0x22}}|Effect|pre=unchanged}}
{{PacketList|{{change|0x44|0x45}}|Update Health|pre=unchanged}}
+
{{PacketList|{{change|0x22|0x23}}|Particle|pre=unchanged}}
{{PacketList|{{change|0x45|0x46}}|Scoreboard Objective|pre=unchanged}}
+
{{PacketList|{{change|0x23|0x24}}|Update Light}}
{{PacketList|{{change|0x46|0x47}}|Set Passengers|pre=unchanged}}
+
{{PacketList|{{change|0x24|0x25}}|Join Game|pre=unchanged}}
{{PacketList|{{change|0x47|0x48}}|Teams|pre=unchanged}}
+
{{PacketList|{{change|0x25|0x26}}|Map Data}}
{{PacketList|{{change|0x48|0x49}}|Update Score|pre=unchanged}}
+
{{PacketList|{{change|0x26|0x27}}|Trade List|pre=unchanged}}
{{PacketList|{{change|0x49|0x4A}}|Spawn Position|pre=unchanged}}
+
{{PacketList|{{change|0x27|0x28}}|Entity Position|pre=unchanged}}
{{PacketList|{{change|0x4A|0x4B}}|Time Update|pre=unchanged}}
+
{{PacketList|{{change|0x28|0x29}}|Entity Position and Rotation|pre=unchanged}}
{{PacketList|{{change|0x4B|0x4C}}|Title|pre=unchanged}}
+
{{PacketList|{{change|0x29|0x2A}}|Entity Rotation|pre=unchanged}}
{{PacketList|{{change|0x4C|0x4D}}|Stop Sound|pre=unchanged}}
+
{{PacketList|{{change|0x2A|0x2B}}|Entity Movement|pre=unchanged}}
{{PacketList|{{change|0x4D|0x4E}}|Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x2B|0x2C}}|Vehicle Move (clientbound)|pre=unchanged}}
{{PacketList|0x4F|Entity Sound Effect|rel=added}}
+
{{PacketList|{{change|0x2C|0x2D}}|Open Book|pre=unchanged}}
{{PacketList|{{change|0x4E|0x50}}|Player List Header And Footer|pre=unchanged}}
+
{{PacketList|{{change|0x2D|0x2E}}|Open Window|pre=unchanged}}
{{PacketList|{{change|0x4F|0x51}}|Collect Item|pre=unchanged}}
+
{{PacketList|{{change|0x2E|0x2F}}|Open Sign Editor|pre=unchanged}}
{{PacketList|{{change|0x50|0x52}}|Entity Teleport|pre=unchanged}}
+
{{PacketList|{{change|0x2F|0x30}}|Craft Recipe Response|pre=unchanged}}
{{PacketList|{{change|0x51|0x53}}|Advancements|pre=unchanged}}
+
{{PacketList|{{change|0x30|0x31}}|Player Abilities (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x52|0x54}}|Entity Properties|pre=unchanged}}
+
{{PacketList|{{change|0x31|0x32}}|Combat Event|pre=unchanged}}
{{PacketList|{{change|0x53|0x55}}|Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x32|0x33}}|Player Info|pre=unchanged}}
{{PacketList|{{change|0x54|0x56}}|Declare Recipes|pre=unchanged}}
+
{{PacketList|{{change|0x33|0x34}}|Face Player|pre=unchanged}}
{{PacketList|{{change|0x55|0x57}}|Tags}}
+
{{PacketList|{{change|0x34|0x35}}|Player Position And Look (clientbound)}}
{{PacketList|0x58|Update Light|rel=added}}
+
{{PacketList|{{change|0x35|0x36}}|Unlock Recipes|pre=unchanged}}
{{PacketList|{{change|0x14|0x59}}|Open Window}}
+
{{PacketList|{{change|0x36|0x37}}|Destroy Entities|pre=unchanged}}
{{PacketList|0x5A|Trade List|rel=added}}
+
{{PacketList|{{change|0x37|0x38}}|Remove Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x38|0x39}}|Resource Pack Send}}
 +
{{PacketList|{{change|0x39|0x3A}}|Respawn|pre=unchanged}}
 +
{{PacketList|{{change|0x3A|0x3B}}|Entity Head Look|pre=unchanged}}
 +
{{PacketList|{{change|0x3B|0x3C}}|Multi Block Change|pre=unchanged}}
 +
{{PacketList|{{change|0x3C|0x3D}}|Select Advancement Tab|pre=unchanged}}
 +
{{PacketList|{{change|0x3D|0x3E}}|World Border|pre=unchanged}}
 +
{{PacketList|{{change|0x3E|0x3F}}|Camera|pre=unchanged}}
 +
{{PacketList|{{change|0x3F|0x40}}|Held Item Change (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x40|0x41}}|Update View Position|pre=unchanged}}
 +
{{PacketList|{{change|0x41|0x42}}|Update View Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x42|0x43}}|Spawn Position|pre=unchanged}}
 +
{{PacketList|{{change|0x43|0x44}}|Display Scoreboard|pre=unchanged}}
 +
{{PacketList|{{change|0x44|0x45}}|Entity Metadata|pre=unchanged}}
 +
{{PacketList|{{change|0x45|0x46}}|Attach Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x46|0x47}}|Entity Velocity|pre=unchanged}}
 +
{{PacketList|{{change|0x47|0x48}}|Entity Equipment|pre=unchanged}}
 +
{{PacketList|{{change|0x48|0x49}}|Set Experience|pre=unchanged}}
 +
{{PacketList|{{change|0x49|0x4A}}|Update Health|pre=unchanged}}
 +
{{PacketList|{{change|0x4A|0x4B}}|Scoreboard Objective|pre=unchanged}}
 +
{{PacketList|{{change|0x4B|0x4C}}|Set Passengers|pre=unchanged}}
 +
{{PacketList|{{change|0x4C|0x4D}}|Teams|pre=unchanged}}
 +
{{PacketList|{{change|0x4D|0x4E}}|Update Score|pre=unchanged}}
 +
{{PacketList|{{change|0x4E|0x4F}}|Time Update|pre=unchanged}}
 +
{{PacketList|{{change|0x4F|0x50}}|Title|pre=unchanged}}
 +
{{PacketList|{{change|0x50|0x51}}|Entity Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x51|0x52}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x52|0x53}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x54}}|Player List Header And Footer|pre=unchanged}}
 +
{{PacketList|{{change|0x54|0x55}}|NBT Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x56}}|Collect Item|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x57}}|Entity Teleport|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x58}}|Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x59}}|Entity Properties|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x5A}}|Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x5A|0x5B}}|Declare Recipes|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x5C}}|Tags}}
 
  |-
 
  |-
 
!colspan="4"| Play serverbound
 
!colspan="4"| Play serverbound
{{PacketList|0x1B|Recipe Book Data}}
+
{{PacketList|0x05|Client Settings}}
{{PacketList|0x29|Player Block Placement}}
+
|-
 +
!colspan="4"| Handshaking serverbound
 +
{{PacketList|0x00|Handshake}}
 
  |}
 
  |}
  
Line 109: Line 121:
 
== Entity Metadata ==
 
== Entity Metadata ==
  
=== Entity Metadata Format ===
+
{{#vardefine:meta_prerelease|1}}
 
 
Note that entity metadata is a totally distinct concept from block metadata.  It is not required to send all metadata fields, or even any metadata fields, so long as the terminating entry is correctly sent.
 
 
 
Entity Metadata is an array of entries, each of which looks like the following:
 
 
 
{| class="wikitable"
 
! Name
 
! Type
 
! Meaning
 
|-
 
| Index
 
| Unsigned Byte
 
| Unique index key determining the meaning of the following value, see the table below. If this is <code>0xff</code> then the it is the end of the Entity Metadata array and no more is read.
 
|-
 
| Type
 
| Optional VarInt Enum
 
| Only if Index is not <code>0xff</code>; the type of the index, see the table below
 
|-
 
| Value
 
| Optional ''value of Type''
 
| Only if Index is not <code>0xff</code>: the value of the metadata field
 
|}
 
 
 
{| class="wikitable"
 
! Value of Type field
 
! [[Data types|Type]] of Value field
 
! Notes
 
|-
 
| 0
 
| Byte
 
|
 
|-
 
| 1
 
| VarInt
 
|
 
|-
 
| 2
 
| Float
 
|
 
|-
 
| 3
 
| String
 
|
 
|-
 
| 4
 
| [[Chat]]
 
|
 
|-
 
| 5
 
| OptChat (Boolean + Optional [[Chat]])
 
| [[Chat]] is present if the Boolean is set to true
 
|-
 
| 6
 
| [[Slot]]
 
|
 
|-
 
| 7
 
| Boolean
 
|
 
|-
 
| 8
 
| Rotation
 
| 3 floats: rotation on x, rotation on y, rotation on z
 
|-
 
| 9
 
| [[Data Types#Position|Position]]
 
|
 
|-
 
| 10
 
| OptPosition (Boolean + Optional Position)
 
| Position is present if the Boolean is set to true
 
|-
 
| 11
 
| Direction (VarInt)
 
| (Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5)
 
|-
 
| 12
 
| OptUUID (Boolean + Optional UUID)
 
| UUID is present if the Boolean is set to true
 
|-
 
| 13
 
| OptBlockID (VarInt)
 
| 0 for absent otherwise, <code><nowiki>id &lt;&lt; 4 | data</nowiki></code>
 
|-
 
| 14
 
| [[NBT]]
 
|
 
|-
 
| 15
 
| [[Data Types#Particle|Particle]]
 
|
 
|- {{Added}}
 
| 16
 
| Villager Data
 
| 3 VarInts: villager type, villager profession, level
 
|- {{Added}}
 
| 17
 
| OptVarInt
 
| 0 for absent; 1 + actual value otherwise.  Used for entity IDs.
 
|}
 
 
 
Villager type (<code>minecraft:villager_type</code> registry):
 
 
 
{| class="wikitable"
 
! Name !! ID
 
|-
 
| <code>minecraft:desert</code> || 0
 
|-
 
| <code>minecraft:jungle</code> || 1
 
|-
 
| <code>minecraft:plains</code> || 2
 
|-
 
| <code>minecraft:savanna</code> || 3
 
|-
 
| <code>minecraft:snow</code> || 4
 
|-
 
| <code>minecraft:swamp</code> || 5
 
|-
 
| <code>minecraft:taiga</code> || 6
 
|}
 
 
 
Villager professions (<code>minecraft:villager_profession</code> registry):
 
 
 
{| class="wikitable"
 
! Name !! ID
 
|-
 
| <code>minecraft:none</code> || 0
 
|-
 
| <code>minecraft:armorer</code> || 1
 
|-
 
| <code>minecraft:butcher</code> || 2
 
|-
 
| <code>minecraft:cartographer</code> || 3
 
|-
 
| <code>minecraft:cleric</code> || 4
 
|-
 
| <code>minecraft:farmer</code> || 5
 
|-
 
| <code>minecraft:fisherman</code> || 6
 
|-
 
| <code>minecraft:fletcher</code> || 7
 
|-
 
| <code>minecraft:leatherworker</code> || 8
 
|-
 
| <code>minecraft:librarian</code> || 9
 
|-
 
| <code>minecraft:mason</code> || 10
 
|-
 
| <code>minecraft:nitwit</code> || 11
 
|-
 
| <code>minecraft:shepherd</code> || 12
 
|-
 
| <code>minecraft:toolsmith</code> || 13
 
|-
 
| <code>minecraft:weaponsmith</code> || 14
 
|}
 
 
 
=== Mobs ===
 
 
 
Entity IDs have shifted with the addition of some new mobs.
 
 
 
=== Itemed Throwable ===
 
 
 
Extends [[#Throwable|Throwable]].
 
 
 
Used for all things that previously extended throwable other than potions, which already had an item.
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
| 6
 
| Slot
 
|colspan="2"| Item
 
| empty (which behaves as if it were a specific item, depending on the subclass)
 
|}
 
 
 
=== Egg ===
 
 
 
Extends [[#Throwable|Throwable]].
 
 
 
No additional metadata.
 
 
 
An empty item behaves as if the item were a <code>minecraft:egg</code>.
 
 
 
=== Ender Pearl ===
 
 
 
Extends [[#Throwable|Throwable]].
 
 
 
No additional metadata.
 
 
 
An empty item behaves as if the item were a <code>minecraft:ender_pearl</code>.
 
 
 
=== Experience Bottle ===
 
 
 
Extends [[#Throwable|Throwable]].
 
 
 
No additional metadata.
 
 
 
<code>minecraft:experience_bottle</code>
 
 
 
=== Snowball ===
 
 
 
Extends [[#Throwable|Throwable]].
 
 
 
No additional metadata.
 
 
 
<code>minecraft:snowball</code>
 
 
 
=== Eye of Ender ===
 
 
 
Extends [[#Entity|Entity]].
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
| 6
 
| Slot
 
|colspan="2"| Item
 
| empty (which behaves as if it were a <code>minecraft:ender_eye</code>)
 
|}
 
 
 
=== 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
 
|}
 
 
 
=== Itemed Fireball ===
 
 
 
Extends [[#Entity|Entity]].
 
 
 
Used for regular and small fireballs.  Not used for dragon fireballs and wither skulls.  Interestingly, regular fireballs do not come from an item.
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
| 6
 
| Slot
 
|colspan="2"| Item
 
| empty (which behaves as if it were a <code>minecraft:fire_charge</code>)
 
|}
 
 
 
=== Fireball ===
 
 
 
Extends {{change|[[#Abstract Fireball|Abstract Fireball]]|[[#Itemed Fireball|Itemed Fireball]]}}.  This is the large fireball shot by ghasts.
 
 
 
No additional metadata.
 
 
 
=== Small Fireball ===
 
 
 
Extends {{change|[[#Abstract Fireball|Abstract Fireball]]|[[#Itemed Fireball|Itemed Fireball]]}}.  This is the fireball shot by blazes and dispensers with fire charges.
 
  
No additional metadata.
+
{{Warning2|Note that other entities have had metadata shifts due to these changes, not shown here.}}
  
=== Fireworks ===
+
=== Entity ===
  
Extends [[#Entity|Entity]].
+
{{metadata inherit|Entity}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 446: Line 135:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | 6
+
  |rowspan="9"| {{Metadata id|}}
| [[Slot]]
+
  |rowspan="9"| Byte
|colspan="2"| Firework info
 
| empty
 
|-
 
| 7
 
| {{Change|VarInt|OptVarInt}}
 
|colspan="2"| Entity ID 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
 
  ! Bit mask
 
  ! Meaning
 
  ! Meaning
  |rowspan="6"| 0
+
  |rowspan="9"| 0
 
  |-
 
  |-
 
  | 0x01
 
  | 0x01
  | Unused
+
  | Is on fire
 
  |-
 
  |-
 
  | 0x02
 
  | 0x02
  | Is sneezing
+
  | Is crouching
 
  |-
 
  |-
 
  | 0x04
 
  | 0x04
  | Is eating
+
  | Unused (previously riding)
 
  |-
 
  |-
 
  | 0x08
 
  | 0x08
  | Unknown
+
  | Is sprinting
 
  |-
 
  |-
 
  | 0x10
 
  | 0x10
  | Unknown
+
  | Is swimming
|}
 
 
 
=== Pillager ===
 
 
 
Extends [[#Abstract Illager|Abstract Illlager]].
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
  | 13
+
  | 0x20
  | Boolean
+
  | Is invisible
| 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
+
  | 0x40
  |colspan="2"| Spawn smoke particles (trust gaining failed)
+
  | has glowing effect
 
  |-
 
  |-
  | 41
+
  | 0x80
  |colspan="2"| Spawn heart particles (trust gaining succeeded)
+
  | Is flying with an {{Minecraft Wiki|elytra}}
|}
 
 
 
=== Cat ===
 
 
 
Extends [[#TameableAnimal|TameableAnimal]].
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
  | 15
+
  | {{Metadata id|}}
 
  | VarInt
 
  | 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)
+
  |colspan="2"| Air ticks
  | 1
+
| 300
 +
|-
 +
| {{Metadata id|}}
 +
| OptChat
 +
|colspan="2"| Custom name
 +
  | empty
 
  |-
 
  |-
  | 16
+
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Unknown
+
  |colspan="2"| Is custom name visible
 
  | false
 
  | false
 
  |-
 
  |-
  | 17
+
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Unknown
+
  |colspan="2"| Is silent
 
  | false
 
  | false
 
  |-
 
  |-
  | 18
+
  | {{Metadata id|}}
| VarInt
 
|colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
 
| 14 (Red)
 
|}
 
 
 
=== Villager ===
 
 
 
Extends [[#Ageable|Ageable]].
 
 
 
{| class="wikitable"
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
| 13
 
| {{change|VarInt|Villager Data}}
 
|colspan="2"| {{Change|Profession (Farmer = 0, Librarian = 1, Priest = 2, Blacksmith = 3, Butcher = 4, Nitwit = 5)|Villager Data}}
 
| {{change|0|Plains/None/1}}
 
|}
 
 
 
=== Zombie Villager ===
 
 
 
Extends [[#Zombie|Zombie]].
 
 
 
{| class="wikitable"
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
| 16
 
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is converting
+
  |colspan="2"| Has no gravity
 
  | false
 
  | false
  |-  
+
  |-
| 17
+
  | {{Metadata id|}}
  | {{Change|VarInt|Villager Data}}
+
| Pose
  |colspan="2"| {{Change|Profession|Villager Data}}
+
  |colspan="2"| Pose
  | {{change|0|Plains/None/1}}
+
| STANDING
 +
|- {{added}}
 +
  | {{Metadata id|added}}
 +
| VarInt
 +
|colspan="2"| Ticks frozen in powdered snow
 +
| 0
 
  |}
 
  |}
  
Line 656: Line 205:
 
No changes so far.
 
No changes so far.
  
== Plugin Channels ==
+
== Inventories ==
  
=== <code>minecraft:book_open</code> ===
+
No changes so far.
{{change|''Server to client''}}
 
  
{{change|When a player right clicks with a signed book. This tells the client to open the book GUI.}}
+
== Plugin Channels ==
  
{{change|The payload is a VarInt enum for the selected hand: 0 for the main hand, 1 for the offhand.}}
+
No changes so far.
 
 
{{change||Replaced with [[#Open Book|Open Book]] packet.}}
 
 
 
=== <code>minecraft:trader_list</code> ===
 
{{change|''Server to client''}}
 
 
 
{{change|The list of trades a villager NPC is offering.}}
 
 
 
{{change||Replaced with [[#Trade List|Trade List]] packet.}}
 
  
 
== Play ==
 
== Play ==
Line 678: Line 217:
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Spawn Object ====
+
==== Sculk Vibration Signal ====
  
Sent by the server when a vehicle or other object is created.
+
{| class="wikitable" {{Added}}
 
 
{| class="wikitable"
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 690: Line 227:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="12"| 0x00
+
  |rowspan="4"| 0x05
  |rowspan="12"| Play
+
  |rowspan="4"| Play
  |rowspan="12"| Client
+
  |rowspan="4"| Client
  | Entity ID
+
  | Source Position
| VarInt
 
| EID of the object
 
|-
 
| Object UUID
 
| UUID
 
|
 
|-
 
| Type
 
| {{change|Byte|VarInt}}
 
| The type of object. {{change|(see [[Entities#Objects]])|Uses the same entity type IDs as in Spawn Mob}}
 
|-
 
| X
 
| Double
 
|
 
|-
 
| Y
 
| Double
 
|
 
|-
 
| Z
 
| Double
 
|
 
|-
 
| Pitch
 
| Angle
 
|
 
|-
 
| Yaw
 
| Angle
 
|
 
|-
 
| Data
 
| Int
 
| Meaning dependent on the value of the Type field, see [[Object Data]] for details.
 
|-
 
| Velocity X
 
| Short
 
|rowspan="3"| Same units as [[#Entity Velocity|Entity Velocity]].  Always sent, but only used when Data is greater than 0 (except for some entities which always ignore it; see [[Object Data]] for details).
 
|-
 
| Velocity Y
 
| Short
 
|-
 
| Velocity Z
 
| Short
 
|}
 
 
 
==== Update Block Entity ====
 
 
 
Sets the block entity associated with the block at the given location.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| 0x09
 
|rowspan="3"| Play
 
|rowspan="3"| Client
 
| Location
 
 
  | Position
 
  | Position
  |  
+
  | Source position for the vibration.
 
  |-
 
  |-
  | Action
+
  | Destination Identifier
  | Unsigned Byte
+
  | Identifier
  | The type of update to perform, see below
+
  | Identifier of the destination codec type.
 
  |-
 
  |-
  | NBT Data
+
  | Destination
  | [[NBT|NBT Tag]]
+
  | Varies
  | 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)
+
  | Vanilla default destinations are a block position encoded as a [https://wiki.vg/Protocol#Data_types Position] for "block" or an entity id encoded as a VarInt for "entity".
|}
 
 
 
''Action'' field:
 
 
 
* '''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.)
 
* '''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''': {{change|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}}
 
* '''13''': {{Change||Set items in a campfire}}
 
 
 
==== Open Horse Window ====
 
 
 
{{Change||This packet is used exclusively for opening the horse GUI.  [[#Open Window|Open Window]] is used for all other GUIs, and now has ID 0x59.}}
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x14
+
  | Arrival Ticks
|rowspan="3"| Play
 
|rowspan="3"| Client
 
| Window ID?
 
| Byte
 
|
 
|-
 
| Number of slots?
 
 
  | VarInt
 
  | VarInt
  |
+
  | Ticks for the signal to arrive at the destination.
|-
 
| Entity ID?
 
| Integer
 
|
 
 
  |}
 
  |}
 +
This packet shows a permanent particle.
  
 
==== Chunk Data ====
 
==== Chunk Data ====
Line 816: Line 252:
 
{{See also|#Unload Chunk}}
 
{{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).
+
{{Need Info|How do biomes work now?  The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed...  ([https://www.reddit.com/r/Mojira/comments/e5at6i/a_discussion_for_the_changes_to_how_biomes_are/ /r/mojira discussion] which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)}}
 +
 
 +
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimension 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"
 
{| class="wikitable"
Line 826: Line 264:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| 0x22
+
  |rowspan="13"| {{change|0x20|0x21}}
  |rowspan="9"| Play
+
  |rowspan="13"| Play
  |rowspan="9"| Client
+
  |rowspan="13"| Client
 
  | Chunk X
 
  | Chunk X
 
  | Int
 
  | Int
Line 836: Line 274:
 
  | Int
 
  | Int
 
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  | Chunk coordinate (block coordinate divided by 16, rounded down)
  |-
+
  |- {{removed}}
 
  | Full chunk
 
  | Full chunk
 
  | Boolean
 
  | Boolean
 
  | See [[Chunk Format#Full chunk|Chunk Format]]
 
  | See [[Chunk Format#Full chunk|Chunk Format]]
  |-
+
  |- {{removed}}
 
  | Primary Bit Mask
 
  | Primary Bit Mask
 
  | VarInt
 
  | VarInt
 
  | 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).
 
  | 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).
  |- {{Added}}
+
  |- {{added}}
 +
| Bit Mask Length
 +
| VarInt
 +
| Length of the following array
 +
|- {{added}}
 +
| Primary Bit Mask
 +
| Array of Long
 +
| BitSet with bits (world height in blocks / 16) 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 the lowest y to 15 blocks above).
 +
|-
 
  | Heightmaps
 
  | Heightmaps
 
  | [[NBT]]
 
  | [[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).
+
  | 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 totaling 36 longs). The Notchian server also adds a <code>WORLD_SURFACE</code> long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
 +
|-
 +
| Biomes length
 +
| {{change|Optional|}} VarInt
 +
| Size of the following array; should always be 1024.  {{change|Not present if full chunk is false.|}}
 +
|-
 +
| Biomes
 +
| {{change|Optional|}} Array of VarInt
 +
| 1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.  {{change|Not present if full chunk is false.|}}  See [[Chunk Format#Biomes|Chunk Format § Biomes]].
 
  |-  
 
  |-  
 
  | Size
 
  | Size
Line 862: Line 316:
 
  |-
 
  |-
 
  | Block entities
 
  | Block entities
  | Array of [[NBT]]
+
  | Array of [[NBT|NBT Tag]]
 
  | All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
 
  | All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
 
  |}
 
  |}
  
===== Data structure =====
+
Note that the Notchian client requires an [[#Update View Position|Update View Position]] packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.
  
The data section of the packet contains most of the useful data for the chunk.
+
The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.
 +
 
 +
New format, 5 bits per block, containing the following references to blocks in a palette (not shown): <span style="border: solid 2px hsl(0, 90%, 60%)">1</span><span style="border: solid 2px hsl(30, 90%, 60%)">2</span><span style="border: solid 2px hsl(60, 90%, 60%)">2</span><span style="border: solid 2px hsl(90, 90%, 60%)">3</span><span style="border: solid 2px hsl(120, 90%, 60%)">4</span><span style="border: solid 2px hsl(150, 90%, 60%)">4</span><span style="border: solid 2px hsl(180, 90%, 60%)">5</span><span style="border: solid 2px hsl(210, 90%, 60%)">6</span><span style="border: solid 2px hsl(240, 90%, 60%)">6</span><span style="border: solid 2px hsl(270, 90%, 60%)">4</span><span style="border: solid 2px hsl(300, 90%, 60%)">8</span><span style="border: solid 2px hsl(330, 90%, 60%)">0</span><span style="border: solid 2px hsl(0, 90%, 30%)">7</span><span style="border: solid 2px hsl(30, 90%, 30%)">4</span><span style="border: solid 2px hsl(60, 90%, 30%)">3</span><span style="border: solid 2px hsl(90, 90%, 30%)">13</span><span style="border: solid 2px hsl(120, 90%, 30%)">15</span><span style="border: solid 2px hsl(150, 90%, 30%)">16</span><span style="border: solid 2px hsl(180, 90%, 30%)">9</span><span style="border: solid 2px hsl(210, 90%, 30%)">14</span><span style="border: solid 2px hsl(240, 90%, 30%)">10</span><span style="border: solid 2px hsl(270, 90%, 30%)">12</span><span style="border: solid 2px hsl(300, 90%, 30%)">0</span><span style="border: solid 2px hsl(330, 90%, 30%)">2</span>
 +
 
 +
<code>0020863148418841</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 60%)">00000</span><span style="outline: solid 2px hsl(300, 90%, 60%)">01000</span><span style="outline: solid 2px hsl(270, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(240, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(210, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(180, 90%, 60%)">00101</span><span style="outline: solid 2px hsl(150, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(120, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(90, 90%, 60%)">00011</span><span style="outline: solid 2px hsl(60, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(30, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(0, 90%, 60%)">00001</span></code><br>
 +
<code>01018A7260F68C87</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 30%)">00010</span><span style="outline: solid 2px hsl(300, 90%, 30%)">00000</span><span style="outline: solid 2px hsl(270, 90%, 30%)">01100</span><span style="outline: solid 2px hsl(240, 90%, 30%)">01010</span><span style="outline: solid 2px hsl(210, 90%, 30%)">01110</span><span style="outline: solid 2px hsl(180, 90%, 30%)">01001</span><span style="outline: solid 2px hsl(150, 90%, 30%)">10000</span><span style="outline: solid 2px hsl(120, 90%, 30%)">01111</span><span style="outline: solid 2px hsl(90, 90%, 30%)">01101</span><span style="outline: solid 2px hsl(60, 90%, 30%)">00011</span><span style="outline: solid 2px hsl(30, 90%, 30%)">00100</span><span style="outline: solid 2px hsl(0, 90%, 30%)">00111</span></code>
 +
 
 +
==== Update Light ====
 +
 
 +
Updates light levels for a chunk.
  
 
{| class="wikitable"
 
{| class="wikitable"
  |-
+
  ! Packet ID
  ! Field Name
+
! State
  ! Field Type
+
! Bound To
 +
  !colspan="2"| Field Name
 +
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | Data
+
  |rowspan="21"| {{change|0x23|0x24}}
  | Array of [[#Chunk Section structure|Chunk Section]]
+
|rowspan="21"| Play
  | 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.
+
|rowspan="21"| Client
 +
  |colspan="2"| Chunk X
 +
|colspan="2"| VarInt
 +
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  | Biomes
+
  |colspan="2"| Chunk Z
  | Optional Int Array
+
  |colspan="2"| VarInt
| Only sent if Ground-Up Continuous is true; 256 entries if present
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
  |}
 
 
 
===== 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
+
  |colspan="2"| Trust Edges
  ! Field Type
+
  |colspan="2"| Boolean
  ! Notes
+
  | If edges should be trusted for light updates.
 +
|- {{removed}}
 +
|colspan="2"| Sky Light Mask
 +
|colspan="2"| VarInt
 +
| 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)
 +
|- {{removed}}
 +
|colspan="2"| Block Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, with the same order as sky light
 +
|- {{removed}}
 +
|colspan="2"| Empty Sky Light Mask
 +
|colspan="2"| 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.
 +
|- {{removed}}
 +
|colspan="2"| Empty Block Light Mask
 +
|colspan="2"| 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.
 +
|- {{Added}}
 +
|colspan="2"| Length 1
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Sky Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing bits for each sections in the world + 2 (lowest bit 16-1 blocks below min world height, highest 1-16 above max world height)
 +
|- {{Added}}
 +
|colspan="2"| Length 2
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Block Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing bits for each sections in the world + 2, same order as sky light
 +
|- {{Added}}
 +
|colspan="2"| Length 3
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Empty Sky Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their sky light values
 +
|- {{Added}}
 +
|colspan="2"| Length 4
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Empty Block Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their block light values
 
  |- {{added}}
 
  |- {{added}}
  | Block count
+
  |colspan="2"| Sky Light array count
  | Short
+
  |colspan="2"| VarInt
  | 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).
+
  | Number of entries in the following array
 
  |-
 
  |-
  | Bits Per Block
+
  |rowspan="2"| Sky Light arrays
  | Unsigned Byte
+
| Length
  | Determines how many bits are used to encode a block. Note that not all numbers are valid here.
+
|rowspan="2"| Array
 +
  | VarInt
 +
  | Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Palette
+
  | Sky Light array
  | Varies
+
  | Array of 2048 bytes
  | See below for the format.
+
  | 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.
 +
|- {{added}}
 +
|colspan="2"| Block Light array count
 +
|colspan="2"| VarInt
 +
| Number of entries in the following array
 
  |-
 
  |-
  | Data Array Length
+
  |rowspan="2"| Block Light arrays
 +
| Length
 +
|rowspan="2"| Array
 
  | VarInt
 
  | VarInt
  | Number of longs in the following array
+
  | Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Data Array
+
  | Block Light array
  | Array of Long
+
  | Array of 2048 bytes
  | Compacted list of 4096 indices pointing to state IDs in the Palette
+
  | 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.
|- {{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''.}}
 
  
 
==== Map Data ====
 
==== Map Data ====
Line 938: Line 446:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="17"| 0x26
+
  |rowspan="18"| {{change|0x25|0x26}}
  |rowspan="17"| Play
+
  |rowspan="18"| Play
  |rowspan="17"| Client
+
  |rowspan="18"| Client
 
  |colspan="2"| Map ID
 
  |colspan="2"| Map ID
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
Line 948: Line 456:
 
  |colspan="2"| Byte
 
  |colspan="2"| Byte
 
  | From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
 
  | From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
  |-  
+
  |- {{removed}}
 
  |colspan="2"| Tracking Position
 
  |colspan="2"| Tracking Position
 
  |colspan="2"| Boolean
 
  |colspan="2"| Boolean
 
  | Specifies whether player and item frame icons are shown
 
  | Specifies whether player and item frame icons are shown
  |- {{Added}}
+
  |-
 
  |colspan="2"| Locked
 
  |colspan="2"| Locked
 
  |colspan="2"| Boolean
 
  |colspan="2"| Boolean
 
  | True if the map has been locked in a cartography table
 
  | True if the map has been locked in a cartography table
 
  |-  
 
  |-  
 +
|- {{added}}
 +
|colspan="2"| Tracking Position
 +
|colspan="2"| Boolean
 +
| Specifies whether player and item frame icons are shown
 +
|-
 
  |colspan="2"| Icon Count
 
  |colspan="2"| Icon Count
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | Number of elements in the following array
+
  | Number of elements in the following array. {{change||Only present if "Tracking Position" is true.}}
 
  |-
 
  |-
  |rowspan="5"| Icon
+
  |rowspan="6"| Icon
 
  | Type
 
  | Type
 
  |rowspan="6"| Array
 
  |rowspan="6"| Array
Line 988: Line 501:
 
  |-  
 
  |-  
 
  |colspan="2"| Columns
 
  |colspan="2"| Columns
  |colspan="2"| Byte
+
  |colspan="2"| Unsigned Byte
 
  | Number of columns updated
 
  | Number of columns updated
 
  |-
 
  |-
Line 1,103: Line 616:
 
  |}
 
  |}
  
==== Open Book ====
+
==== Player Position And Look (clientbound) ====  
  
Sent when a player right clicks with a signed book. This tells the client to open the book GUI.
+
Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.
  
{| class="wikitable" {{Added}}
+
If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.
! Packet ID
+
 
! State
+
Also if the fixed-point number of X or Z is set greater than <code>3.2E7D</code> the client will be kicked for “Illegal position”.
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="1"| 0x2C
 
|rowspan="1"| Play
 
|rowspan="1"| Client
 
| Hand
 
| VarInt enum
 
| 0: Main hand, 1: Off hand
 
|}
 
  
==== Entity Sound Effect ====
+
Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.
  
Plays a sound effect from an entity.
+
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,135: Line 636:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x4F
+
  |rowspan="8"| {{change|0x34|0x35}}
  |rowspan="5"| Play
+
  |rowspan="8"| Play
  |rowspan="5"| Client
+
  |rowspan="8"| Client
  | Sound ID
+
  | X
  | VarInt
+
  | Double
  | ID of hardcoded sound event ([https://pokechu22.github.io/Burger/18w48a.html#sounds events] as of 18w48a)
+
  | Absolute or relative position, depending on Flags.
 
  |-
 
  |-
  | Sound Category
+
  | Y
  | VarInt Enum
+
  | Double
  | The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories])
+
  | Absolute or relative position, depending on Flags.
 
  |-
 
  |-
  | Entity ID
+
  | Z
  | VarInt
+
  | Double
  |
+
  | Absolute or relative position, depending on Flags.
 
  |-
 
  |-
  | Volume
+
  | Yaw
 
  | Float
 
  | Float
  | 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients
+
  | Absolute or relative rotation on the X axis, in degrees.
 
  |-
 
  |-
 
  | Pitch
 
  | Pitch
 
  | Float
 
  | Float
  | Float between 0.5 and 2.0 by Notchian clients
+
  | Absolute or relative rotation on the Y axis, in degrees.
|}
 
 
 
==== Tags ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="4"| {{Change|0x55|0x57}}
+
  | Flags
|rowspan="4"| Play
+
  | Byte
|rowspan="4"| Client
+
  | Bit field, see below.
  | Block Tags
 
  | (See below)
 
| IDs are block IDs
 
 
  |-
 
  |-
  | Item Tags
+
  | Teleport ID
  | (See below)
+
  | VarInt
  | IDs are item IDs
+
  | Client should confirm this packet with [[#Teleport Confirm|Teleport Confirm]] containing the same Teleport ID.
|-
 
| Fluid Tags
 
| (See below)
 
| IDs are fluid IDs
 
 
  |- {{added}}
 
  |- {{added}}
  | Entity Tags
+
  | Dismount Vehicle
  | (See below)
+
  | Boolean
  | IDs are entity type IDs
+
  | True if the player should dismount their vehicle.
 
  |}
 
  |}
  
==== Declare Recipes ====
+
About the Flags field:
  
{| class="wikitable"
+
  <Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
  ! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
|-
 
|rowspan="5"| {{Change|0x54|0x56}}
 
|rowspan="5"| Play
 
|rowspan="5"| Client
 
|colspan="2"| Num Recipes
 
|colspan="2"| VarInt
 
| Number of elements in the following array
 
|-
 
|rowspan="4"| Recipe
 
|{{removed}}| Recipe ID
 
|rowspan="4"| Array
 
|{{removed}}| Identifier
 
|{{removed}}|
 
|-
 
| Type
 
| {{Change|String|Identifier}}
 
| The recipe serializer, see below
 
|- {{Added}}
 
| Recipe ID
 
| Identifier
 
|
 
|-
 
| Data
 
| Optional, varies
 
| Additional data for the recipe. For some types, there will be no data.
 
|}
 
 
 
Recipe serializers:
 
  
 
{| class="wikitable"
 
{| class="wikitable"
! Serializer
 
! Description
 
! Data
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_shapeless</code>
+
  ! Field
| Shapeless crafting recipe.  All items in the ingredient list must be present, but in any order/slot.
+
  ! Bit
  | As follows:
 
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Group
 
    | String
 
    | Used to group similar recipes together in the recipe book.  Tag is present in recipe JSON.
 
    |-
 
    | Ingredient count
 
    | VarInt
 
    | Number of elements in the following array
 
    |-
 
    | Ingredients
 
    | Array of Ingredient
 
    |
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |}
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_shaped</code>
+
  | X
  | Shaped crafting recipe.  All items must be present in the same pattern (which may be flipped horizontally or translated)
+
  | 0x01
| As follows:
 
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Width
 
    | VarInt
 
    |
 
    |-
 
    | Height
 
    | VarInt
 
    |
 
    |-
 
    | Group
 
    | String
 
    | Used to group similar recipes together in the recipe book.  Tag is present in recipe JSON.
 
    |-
 
    | Ingredients
 
    | Array of Ingredient
 
    | Length is width * height.  Indexed by x + (y * width).
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |}
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_armordye</code>
+
  | Y
| Recipe for dying leather armor
+
  | 0x02
  | None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_bookcloning</code>
+
  | Z
| Recipe for copying contents of written books
+
  | 0x04
  | None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_mapcloning</code>
+
  | Y_ROT
| Recipe for copying maps
+
  | 0x08
  | None
 
 
  |-
 
  |-
  | <code>{{change||minecraft:}}crafting_special_mapextending</code>
+
  | X_ROT
| Recipe for adding paper to maps
+
  | 0x10
| None
 
|-
 
| <code>{{change||minecraft:}}crafting_special_firework_rocket</code>
 
| Recipe for making firework rockets
 
| None
 
|-
 
| <code>{{change||minecraft:}}crafting_special_firework_star</code>
 
| Recipe for making firework stars
 
| None
 
|-
 
| <code>{{change||minecraft:}}crafting_special_firework_star_fade</code>
 
| Recipe for making firework stars fade between multiple colors
 
| None
 
|-
 
| <code>{{change||minecraft:}}crafting_special_repairitem</code>
 
| Recipe for repairing items via crafting
 
| None
 
|-
 
| <code>{{change||minecraft:}}crafting_special_tippedarrow</code>
 
| Recipe for crafting tipped arrows
 
| None
 
|-
 
| <code>{{change||minecraft:}}crafting_special_bannerduplicate</code>
 
| Recipe for copying banner patterns
 
| None
 
|-
 
| <code>{{change||minecraft:}}crafting_special_banneraddpattern</code>
 
| Recipe for adding patterns to banners
 
| None
 
|-
 
| <code>{{change||minecraft:}}crafting_special_shielddecoration</code>
 
| Recipe for applying a banner's pattern to a shield
 
| None
 
|-
 
| <code>{{change||minecraft:}}crafting_special_shulkerboxcoloring</code>
 
| Recipe for recoloring a shulker box
 
| None
 
|- {{Added}}
 
| <code>minecraft:crafting_special_suspiciousstew</code>
 
| Recipe for crafting suspicious stew with various affects.
 
| None
 
|-
 
| <code>{{change||minecraft:}}smelting</code>
 
| Smelting recipe
 
|rowspan="4"| All of these have the same format, as follows:
 
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Group
 
    | String
 
    | Used to group similar recipes together in the recipe book.
 
    |-
 
    | Ingredient
 
    | Ingredient
 
    |
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |-
 
    | Experience
 
    | Float
 
    |
 
    |-
 
    | Cooking time
 
    | VarInt
 
    |
 
    |}
 
|- {{Added}}
 
| <code>minecraft:blasting</code>
 
| Recipes in a blast furnace.
 
|- {{Added}}
 
| <code>minecraft:smoking</code>
 
| Recipes in a smoker.
 
|- {{Added}}
 
| <code>minecraft:campfire_cooking</code>
 
  | Recipes in a campfire.
 
 
  |}
 
  |}
  
Ingredient is defined as:
+
==== Resource Pack Send ====  
 
 
{| class="wikitable"
 
! Name
 
! Type
 
! Description
 
|-
 
| Count
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Items
 
| Array of [[Slot]]
 
| Any item in this array may be used for the recipe.  The count of each item should be 1.
 
|}
 
 
 
==== Update Light ====
 
 
 
Updates light levels for a chunk.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,409: Line 707:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="8"| 0x58
+
  |rowspan="3"| {{change|0x38|0x39}}
  |rowspan="8"| Play
+
  |rowspan="3"| Play
  |rowspan="8"| Client
+
  |rowspan="3"| Client
  | Chunk X
+
  | URL
  | VarInt
+
  | String (32767)
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | The URL to the resource pack.
 
  |-
 
  |-
  | Chunk Z
+
  | Hash
  | VarInt
+
  | String (40)
| Chunk coordinate (block coordinate divided by 16, rounded down)  
+
  | A 40 character hexadecimal and lowercase [[wikipedia:SHA-1|SHA-1]] hash of the resource pack file. (must be lower case in order to work)<br />If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
  |-
+
  |- {{Added}}
| Sky Light Mask
+
  | Forced
| VarInt
+
  | Boolean
| 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)
+
  | The notchian client will be forced to use the resource pack from the server. If they decline they will be kicked from the server.
|-
 
| Block Light Mask
 
| VarInt
 
| Mask containing 18 bits, with the same order as sky light
 
|-
 
| 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.
+
==== Tags ====
 
 
==== Open Window ====
 
 
 
This is sent to the client when it should open an inventory, such as a chest, workbench, or furnace. This message is not sent anywhere for clients opening their own inventory.  {{change||For horses, use [[#Open Horse Window|Open Horse Window]]}}
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,455: Line 729:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| {{change|0x14|0x59}}
+
  |rowspan="8"| {{change|0x5B|0x5C}}
  |rowspan="5"| Play
+
  |rowspan="8"| Play
  |rowspan="5"| Client
+
  |rowspan="8"| Client
  | Window ID
+
  |- {{removed}}
| {{change|Unsigned Byte|VarInt}}
+
  | colspan="2"| Block Tags
  | A unique id number for the window to be displayed. Notchian server implementation is a counter, starting at 1.
+
  | colspan="2"| (See below)
|-
+
| IDs are block IDs
  | Window Type
+
  |- {{removed}}
| {{change|String (32)|VarInt}}
+
  | colspan="2"| Item Tags
  | The window type to use for display. {{change|See [[Inventory]] for a list|contained in the <code>minecraft:menu</code> regisry}}.
+
  | colspan="2"| (See below)
  |-
+
  | IDs are item IDs
  | Window Title
 
| [[Chat]]
 
  | The title of the window
 
 
  |- {{removed}}
 
  |- {{removed}}
  | Number Of Slots
+
  | colspan="2"| Fluid Tags
  | Unsigned Byte
+
  | colspan="2"| (See below)
  | Number of slots in the window (excluding the number of slots in the player inventory). Always 0 for non-storage windows (e.g. Workbench, Anvil).
+
  | IDs are fluid IDs
 
  |- {{removed}}
 
  |- {{removed}}
  | Entity ID
+
  | colspan="2"| Entity Tags
  | Optional Int
+
| colspan="2"| (See below)
  | EntityHorse's EID. Only sent when Window Type is “EntityHorse”
+
| IDs are entity IDs
 +
|- {{added}}
 +
| colspan="2"| Length of the array
 +
| colspan="2"| VarInt
 +
|
 +
|- {{added}}
 +
|rowspan="2"| Array of tags
 +
| Tag type
 +
|rowspan="2"| Array
 +
| Identifier
 +
| Tag identifier (Vanilla required tags are <code>minecraft:block</code>, <code>minecraft:item</code>, <code>minecraft:fluid</code>, <code>minecraft:entity_type</code>, and <code>minecraft:game_event</code>)
 +
|-
 +
| Array of Tag
 +
  | (See below)
 +
  |
 
  |}
 
  |}
  
==== Trade List ====
+
Tags look like:
 
 
The list of trades a villager NPC is offering.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID
 
! State
 
! Bound To
 
 
  !colspan="2"| Field Name
 
  !colspan="2"| Field Name
 
  !colspan="2"| Field Type
 
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="10"| 0x5A
+
  |colspan="2"| Length
  |rowspan="10"| Play
+
  |colspan="2"| VarInt
  |rowspan="10"| Client
+
  | Number of elements in the following array
 
  |-
 
  |-
  | colspan="2" | Window ID
+
  |rowspan="3"| Tags
  | colspan="2" | VarInt
+
  | Tag name
  | The ID of the window that is open; this is an int rather than a byte.
+
|rowspan="3"| Array
 +
| Identifier
 +
  |
 
  |-
 
  |-
  | colspan="2" | Size
+
  | Count
  | colspan="2" | Byte
+
  | VarInt
  | The number of trades in the following array
+
  | Number of elements in the following array
|-
 
| rowspan="7" | Trades
 
| Input item 1
 
| rowspan="7" | Array
 
| [[Slot]]
 
| The first item the villager is buying
 
|-
 
| Output item
 
| [[Slot]]
 
| The item the villager is selling
 
|-
 
| Has second item
 
| Boolean
 
| Whether there is a second item
 
 
  |-
 
  |-
  | Input item 2
+
  | Entries
  | Optional [[Slot]]
+
  | Array of VarInt
  | The second item the villager is buying; only present if they have a second item.
+
  | Numeric ID of the given type (block, item, etc.).
|-
 
| Trade disabled
 
| Boolean
 
| True if the trade is disabled; false if the trade is enabled.
 
|-
 
| Number of trade uses
 
| Integer
 
| Number of times the trade has been used so far
 
|-
 
| Maximum number of trade uses
 
| Integer
 
| Number of times this trade can be used
 
 
  |}
 
  |}
 +
  
 
=== Serverbound ===
 
=== Serverbound ===
  
==== Recipe Book Data ====
+
==== Client Settings ====
 +
 
 +
Sent when the player connects, or when settings are changed.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,546: Line 805:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="11"| 0x1B
+
  |rowspan="7"| 0x05
  |rowspan="11"| Play
+
  |rowspan="7"| Play
  |rowspan="11"| Server
+
  |rowspan="7"| Server
  |colspan="2"| Type
+
  | Locale
  | VarInt
+
  | String (16)
  | Determines the format of the rest of the packet
+
  | e.g. <code>en_GB</code>.
 
  |-
 
  |-
  ! Type
+
  | View Distance
  ! Field Name
+
  | Byte
  !
+
  | Client-side render distance, in chunks.
!
 
 
  |-
 
  |-
  | 0: Displayed Recipe
+
  | Chat Mode
  | Recipe ID
+
  | VarInt Enum
  | Identifier
+
  | 0: enabled, 1: commands only, 2: hidden. See [[Chat#Processing chat|processing chat]] for more information.
  | A recipe ID
 
 
  |-
 
  |-
  |rowspan="8"| 1: Recipe Book States
+
  | Chat Colors
| Crafting Recipe Book Open
 
 
  | Boolean
 
  | Boolean
  | Whether the player has the crafting recipe book currently opened/active.
+
  | “Colors” multiplayer setting.
 
  |-
 
  |-
  | Crafting Recipe Filter Active
+
  | Displayed Skin Parts
  | Boolean
+
  | Unsigned Byte
  | Whether the player has the crafting recipe book filter option currently active.
+
  | Bit mask, see below.
 
  |-
 
  |-
  | Smelting Recipe Book Open
+
  | Main Hand
  | Boolean
+
  | VarInt Enum
  | Whether the player has the smelting recipe book currently opened/active.
+
  | 0: Left, 1: Right.
|-
 
| Smelting Recipe Filter Active
 
| Boolean
 
| Whether the player has the smelting recipe book filter option currently active.
 
|- {{Added}}
 
| Blasting Recipe Book Open
 
| Boolean
 
| May be swapped with smoking recipe book.  Also, the notchian client appears to use the same value for both of those books currently.
 
 
  |- {{Added}}
 
  |- {{Added}}
  | Blasting Recipe Filter Active
+
  | Disable text filtering
| Boolean
 
| May be swapped with smoking recipe book.  Also, the notchian client appears to use the same value for both of those books currently.
 
|- {{Added}}
 
| Smoking Recipe Book Open
 
| Boolean
 
|
 
|- {{Added}}
 
| Smoking Recipe Filter Active
 
| Boolean
 
|
 
|}
 
 
 
The Recipe Book Status type is sent when one of the states changes.
 
 
 
==== Player Block Placement ====
 
 
 
{| class="wikitable"
 
|-
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="9"| 0x29
 
|rowspan="9"| Play
 
|rowspan="9"| Server
 
|{{removed}}| Location
 
|{{removed}}| Position
 
|{{removed}}| Block position
 
|- {{removed}}
 
| Face
 
| VarInt Enum
 
| The face on which the block is placed (as documented at [[#Player Digging|Player Digging]])
 
|-
 
| Hand
 
| VarInt Enum
 
| The hand from which the block is placed; 0: main hand, 1: off hand
 
|- {{added}}
 
| Location
 
| Position
 
| Block position
 
|- {{added}}
 
| Face
 
| VarInt Enum
 
| The face on which the block is placed (as documented at [[#Player Digging|Player Digging]])
 
|-
 
| Cursor Position X
 
| Float
 
| The position of the crosshair on the block, from 0 to 1 increasing from west to east
 
|-
 
| Cursor Position Y
 
| Float
 
| The position of the crosshair on the block, from 0 to 1 increasing from bottom to top
 
|-
 
| Cursor Position Z
 
| Float
 
| The position of the crosshair on the block, from 0 to 1 increasing from north to south
 
|- {{added}}
 
| Inside block
 
 
  | Boolean
 
  | Boolean
  | True when the player's head is inside of a block.
+
  | Disables filtering of text on signs and written book titles.  Currently always true (i.e. the filtering is disabled)
 
  |}
 
  |}
  
Upon placing a block, this packet is sent once.
+
''Displayed Skin Parts'' flags:
  
The Cursor Position X/Y/Z fields (also known as in-block coordinates) are calculated using raytracing. The unit corresponds to sixteen pixel in the default resource pack. For example, let's say a slab is being placed against the south face of a full block. The Cursor Position X will be higher if the player was pointing near the right (east) edge of the face, lower if pointing near the left. The Cursor Position Y will be used to determine whether it will appear as a bottom slab (values 0.0–0.5) or as a top slab (values 0.5-1.0). The Cursor Position Z should be 1.0 since the player was looking at the southernmost part of the block.
+
* Bit 0 (0x01): Cape enabled
 +
* Bit 1 (0x02): Jacket enabled
 +
* Bit 2 (0x04): Left Sleeve enabled
 +
* Bit 3 (0x08): Right Sleeve enabled
 +
* Bit 4 (0x10): Left Pants Leg enabled
 +
* Bit 5 (0x20): Right Pants Leg enabled
 +
* Bit 6 (0x40): Hat enabled
  
{{Change||Inside block is true when a player's head (specifically eyes) are inside of a block's collision.  In 1.13 and later versions, collision is rather complicated and individual blocks can have multiple collision boxes.  For instance, a ring of vines has a non-colliding hole in the middle.  This value is only true when the player is directly in the box.  In practice, though, this value is only used by scaffolding to place in front of the player when sneaking inside of it (other blocks will place behind when you intersect with them -- try with glass for instance).}}
+
The most significant bit (bit 7, 0x80) appears to be unused.
  
 
== Handshaking ==
 
== Handshaking ==
Line 1,685: Line 878:
 
  | Protocol Version
 
  | Protocol Version
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently {{change|404|459}})
+
  | See [[protocol version numbers]] (currently {{change|754|{{Snapshot PVN|1073741839}}}})
 
  |-
 
  |-
 
  | Server Address
 
  | Server Address
 
  | String
 
  | String
  | Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information.
+
  | Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
 
  |-  
 
  |-  
 
  | Server Port
 
  | Server Port

Latest revision as of 00:28, 2 April 2021

This page documents the changes from the last stable Minecraft release (currently 1.16.5, protocol 754) to the current pre-release (currently 21w07a, protocol Snapshot 15). 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 so far.

Packets

ID Packet name Documentation
Play clientbound
0x05 Sculk Vibration Signal Pre
0x05 0x06 Entity Animation (clientbound) Current (unchanged)
0x06 0x07 Statistics Current (unchanged)
0x07 0x08 Acknowledge Player Digging Current (unchanged)
0x08 0x09 Block Break Animation Current (unchanged)
0x09 0x0A Block Entity Data Current (unchanged)
0x0A 0x0B Block Action Current (unchanged)
0x0B 0x0C Block Change Current (unchanged)
0x0C 0x0D Boss Bar Current (unchanged)
0x0D 0x0E Server Difficulty Current (unchanged)
0x0E 0x0F Chat Message (clientbound) Current (unchanged)
0x0F 0x10 Tab-Complete (clientbound) Current (unchanged)
0x10 0x11 Declare Commands Current (unchanged)
0x11 0x12 Window Confirmation (clientbound) Current (unchanged)
0x12 0x13 Close Window (clientbound) Current (unchanged)
0x13 0x14 Window Items Current (unchanged)
0x14 0x15 Window Property Current (unchanged)
0x15 0x16 Set Slot Current (unchanged)
0x16 0x17 Set Cooldown Current (unchanged)
0x17 0x18 Plugin Message (clientbound) Current (unchanged)
0x18 0x19 Named Sound Effect Current (unchanged)
0x19 0x1A Disconnect (play) Current (unchanged)
0x1A 0x1B Entity Status Current (unchanged)
0x1B 0x1C Explosion Current (unchanged)
0x1C 0x1D Unload Chunk Current (unchanged)
0x1D 0x1E Change Game State Current (unchanged)
0x1E 0x1F Open Horse Window Current (unchanged)
0x1F 0x20 Keep Alive (clientbound) Current (unchanged)
0x20 0x21 Chunk Data Current Pre
0x21 0x22 Effect Current (unchanged)
0x22 0x23 Particle Current (unchanged)
0x23 0x24 Update Light Current Pre
0x24 0x25 Join Game Current (unchanged)
0x25 0x26 Map Data Current Pre
0x26 0x27 Trade List Current (unchanged)
0x27 0x28 Entity Position Current (unchanged)
0x28 0x29 Entity Position and Rotation Current (unchanged)
0x29 0x2A Entity Rotation Current (unchanged)
0x2A 0x2B Entity Movement Current (unchanged)
0x2B 0x2C Vehicle Move (clientbound) Current (unchanged)
0x2C 0x2D Open Book Current (unchanged)
0x2D 0x2E Open Window Current (unchanged)
0x2E 0x2F Open Sign Editor Current (unchanged)
0x2F 0x30 Craft Recipe Response Current (unchanged)
0x30 0x31 Player Abilities (clientbound) Current (unchanged)
0x31 0x32 Combat Event Current (unchanged)
0x32 0x33 Player Info Current (unchanged)
0x33 0x34 Face Player Current (unchanged)
0x34 0x35 Player Position And Look (clientbound) Current Pre
0x35 0x36 Unlock Recipes Current (unchanged)
0x36 0x37 Destroy Entities Current (unchanged)
0x37 0x38 Remove Entity Effect Current (unchanged)
0x38 0x39 Resource Pack Send Current Pre
0x39 0x3A Respawn Current (unchanged)
0x3A 0x3B Entity Head Look Current (unchanged)
0x3B 0x3C Multi Block Change Current (unchanged)
0x3C 0x3D Select Advancement Tab Current (unchanged)
0x3D 0x3E World Border Current (unchanged)
0x3E 0x3F Camera Current (unchanged)
0x3F 0x40 Held Item Change (clientbound) Current (unchanged)
0x40 0x41 Update View Position Current (unchanged)
0x41 0x42 Update View Distance Current (unchanged)
0x42 0x43 Spawn Position Current (unchanged)
0x43 0x44 Display Scoreboard Current (unchanged)
0x44 0x45 Entity Metadata Current (unchanged)
0x45 0x46 Attach Entity Current (unchanged)
0x46 0x47 Entity Velocity Current (unchanged)
0x47 0x48 Entity Equipment Current (unchanged)
0x48 0x49 Set Experience Current (unchanged)
0x49 0x4A Update Health Current (unchanged)
0x4A 0x4B Scoreboard Objective Current (unchanged)
0x4B 0x4C Set Passengers Current (unchanged)
0x4C 0x4D Teams Current (unchanged)
0x4D 0x4E Update Score Current (unchanged)
0x4E 0x4F Time Update Current (unchanged)
0x4F 0x50 Title Current (unchanged)
0x50 0x51 Entity Sound Effect Current (unchanged)
0x51 0x52 Sound Effect Current (unchanged)
0x52 0x53 Stop Sound Current (unchanged)
0x53 0x54 Player List Header And Footer Current (unchanged)
0x54 0x55 NBT Query Response Current (unchanged)
0x55 0x56 Collect Item Current (unchanged)
0x56 0x57 Entity Teleport Current (unchanged)
0x57 0x58 Advancements Current (unchanged)
0x58 0x59 Entity Properties Current (unchanged)
0x59 0x5A Entity Effect Current (unchanged)
0x5A 0x5B Declare Recipes Current (unchanged)
0x5B 0x5C Tags Current Pre
Play serverbound
0x05 Client Settings Current Pre
Handshaking serverbound
0x00 Handshake Current Pre

New/modified data types

No changes so far.

Entity Metadata

Warning.png Note that other entities have had metadata shifts due to these changes, not shown here.

Entity

The base class.

Index Type Meaning Default
0 Byte Bit mask Meaning 0
0x01 Is on fire
0x02 Is crouching
0x04 Unused (previously riding)
0x08 Is sprinting
0x10 Is swimming
0x20 Is invisible
0x40 has glowing effect
0x80 Is flying with an elytra
1 VarInt Air ticks 300
2 OptChat Custom name empty
3 Boolean Is custom name visible false
4 Boolean Is silent false
5 Boolean Has no gravity false
6 Pose Pose STANDING
7 VarInt Ticks frozen in powdered snow 0

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Play

Clientbound

Sculk Vibration Signal

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Client Source Position Position Source position for the vibration.
Destination Identifier Identifier Identifier of the destination codec type.
Destination Varies Vanilla default destinations are a block position encoded as a Position for "block" or an entity id encoded as a VarInt for "entity".
Arrival Ticks VarInt Ticks for the signal to arrive at the destination.

This packet shows a permanent particle.

Chunk Data

Main article: Chunk Format
See also: #Unload Chunk
Huh.png The following information needs to be added to this page:
How do biomes work now? The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed... (/r/mojira discussion which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)

The server only sends skylight information for chunk pillars in the Overworld, it's up to the client to know in which dimension 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 later).

Packet ID State Bound To Field Name Field Type Notes
0x20 0x21 Play Client Chunk X Int Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z Int Chunk coordinate (block coordinate divided by 16, rounded down)
Full chunk Boolean See Chunk Format
Primary Bit Mask VarInt 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).
Bit Mask Length VarInt Length of the following array
Primary Bit Mask Array of Long BitSet with bits (world height in blocks / 16) 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 the lowest y to 15 blocks above).
Heightmaps NBT Compound containing one long array named MOTION_BLOCKING, 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 totaling 36 longs). The Notchian server also adds a WORLD_SURFACE long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
Biomes length Optional VarInt Size of the following array; should always be 1024. Not present if full chunk is false.
Biomes Optional Array of VarInt 1024 biome IDs, ordered by x then z then y, in 4×4×4 blocks. Not present if full chunk is false. See Chunk Format § Biomes.
Size VarInt Size of Data in bytes
Data Byte array See data structure in Chunk Format
Number of block entities VarInt Number of elements in the following array
Block entities Array of NBT Tag All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.

Note that the Notchian client requires an Update View Position packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.

The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.

New format, 5 bits per block, containing the following references to blocks in a palette (not shown): 122344566480743131516914101202

0020863148418841 0000000000100000100001100011000101001000010000011000100001000001
01018A7260F68C87 0000000100000001100010100111001001100000111101101000110010000111

Update Light

Updates light levels for a chunk.

Packet ID State Bound To Field Name Field Type Notes
0x23 0x24 Play Client Chunk X VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Trust Edges Boolean If edges should be trusted for light updates.
Sky Light Mask VarInt 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)
Block Light Mask VarInt Mask containing 18 bits, with the same order as sky light
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.
Length 1 VarInt Length of the following array
Sky Light Mask Array of Long BitSet containing bits for each sections in the world + 2 (lowest bit 16-1 blocks below min world height, highest 1-16 above max world height)
Length 2 VarInt Length of the following array
Block Light Mask Array of Long BitSet containing bits for each sections in the world + 2, same order as sky light
Length 3 VarInt Length of the following array
Empty Sky Light Mask Array of Long BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their sky light values
Length 4 VarInt Length of the following array
Empty Block Light Mask Array of Long BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their block light values
Sky Light array count VarInt Number of entries in the following array
Sky Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Sky Light array Array 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 array count VarInt Number of entries in the following array
Block Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Block Light array Array 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.


Map Data

Updates a rectangular area on a map item.

Packet ID State Bound To Field Name Field Type Notes
0x25 0x26 Play Client Map ID VarInt Map ID of the map being modified
Scale Byte From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
Tracking Position Boolean Specifies whether player and item frame icons are shown
Locked Boolean True if the map has been locked in a cartography table
Tracking Position Boolean Specifies whether player and item frame icons are shown
Icon Count VarInt Number of elements in the following array. Only present if "Tracking Position" is true.
Icon Type Array VarInt enum See below
X Byte Map coordinates: -128 for furthest left, +127 for furthest right
Z Byte Map coordinates: -128 for highest, +127 for lowest
Direction Byte 0-15
Has Display Name Boolean
Display Name Optional Chat Only present if previous Boolean is true
Columns Unsigned Byte Number of columns updated
Rows Optional Byte Only if Columns is more than 0; number of rows updated
X Optional Byte Only if Columns is more than 0; x offset of the westernmost column
Z Optional Byte Only if Columns is more than 0; z offset of the northernmost row
Length Optional VarInt Only if Columns is more than 0; length of the following array
Data Optional Array of Unsigned Byte Only if Columns is more than 0; see Map item format

For icons, a direction of 0 is a vertical icon and increments by 22.5° (360/16).

Types are based off of rows and columns in map_icons.png:

Icon type Result
0 White arrow (players)
1 Green arrow (item frames)
2 Red arrow
3 Blue arrow
4 White cross
5 Red pointer
6 White circle (off-map players)
7 Small white circle (far-off-map players)
8 Mansion
9 Temple
10 White Banner
11 Orange Banner
12 Magenta Banner
13 Light Blue Banner
14 Yellow Banner
15 Lime Banner
16 Pink Banner
17 Gray Banner
18 Light Gray Banner
19 Cyan Banner
20 Purple Banner
21 Blue Banner
22 Brown Banner
23 Green Banner
24 Red Banner
25 Black Banner
26 Treasure marker

Player Position And Look (clientbound)

Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.

If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.

Also if the fixed-point number of X or Z is set greater than 3.2E7D the client will be kicked for “Illegal position”.

Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.

Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.

Packet ID State Bound To Field Name Field Type Notes
0x34 0x35 Play Client X Double Absolute or relative position, depending on Flags.
Y Double Absolute or relative position, depending on Flags.
Z Double Absolute or relative position, depending on Flags.
Yaw Float Absolute or relative rotation on the X axis, in degrees.
Pitch Float Absolute or relative rotation on the Y axis, in degrees.
Flags Byte Bit field, see below.
Teleport ID VarInt Client should confirm this packet with Teleport Confirm containing the same Teleport ID.
Dismount Vehicle Boolean True if the player should dismount their vehicle.

About the Flags field:

<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
Field Bit
X 0x01
Y 0x02
Z 0x04
Y_ROT 0x08
X_ROT 0x10

Resource Pack Send

Packet ID State Bound To Field Name Field Type Notes
0x38 0x39 Play Client URL String (32767) The URL to the resource pack.
Hash String (40) A 40 character hexadecimal and lowercase SHA-1 hash of the resource pack file. (must be lower case in order to work)
If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
Forced Boolean The notchian client will be forced to use the resource pack from the server. If they decline they will be kicked from the server.

Tags

Packet ID State Bound To Field Name Field Type Notes
0x5B 0x5C Play 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
Entity Tags (See below) IDs are entity IDs
Length of the array VarInt
Array of tags Tag type Array Identifier Tag identifier (Vanilla required tags are minecraft:block, minecraft:item, minecraft:fluid, minecraft:entity_type, and minecraft:game_event)
Array of Tag (See below)

Tags look like:

Field Name Field Type Notes
Length VarInt Number of elements in the following array
Tags Tag name Array Identifier
Count VarInt Number of elements in the following array
Entries Array of VarInt Numeric ID of the given type (block, item, etc.).


Serverbound

Client Settings

Sent when the player connects, or when settings are changed.

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Server Locale String (16) e.g. en_GB.
View Distance Byte Client-side render distance, in chunks.
Chat Mode VarInt Enum 0: enabled, 1: commands only, 2: hidden. See processing chat for more information.
Chat Colors Boolean “Colors” multiplayer setting.
Displayed Skin Parts Unsigned Byte Bit mask, see below.
Main Hand VarInt Enum 0: Left, 1: Right.
Disable text filtering Boolean Disables filtering of text on signs and written book titles. Currently always true (i.e. the filtering is disabled)

Displayed Skin Parts flags:

  • Bit 0 (0x01): Cape enabled
  • Bit 1 (0x02): Jacket enabled
  • Bit 2 (0x04): Left Sleeve enabled
  • Bit 3 (0x08): Right Sleeve enabled
  • Bit 4 (0x10): Left Pants Leg enabled
  • Bit 5 (0x20): Right Pants Leg enabled
  • Bit 6 (0x40): Hat enabled

The most significant bit (bit 7, 0x80) appears to be unused.

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.

Packet ID State Bound To Field Name Field Type Notes
0x00 Handshaking Server Protocol Version VarInt See protocol version numbers (currently 754 Snapshot 15)
Server Address String Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
Server Port Unsigned Short Default is 25565. The Notchian server does not use this information.
Next State VarInt Enum 1 for status, 2 for login

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

No changes so far.

Serverbound

No changes so far.