Difference between revisions of "Pre-release protocol"

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(→‎Chunk Data: 1024 biomes is what that array is)
 
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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.14.4, protocol 498]]) to the current pre-release (currently [[Protocol version numbers|19w39a, protocol 556]]). 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 17: 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|0x03|Spawn Mob}}
+
{{PacketList|0x05|Sculk Vibration Signal|rel=added}}
{{PacketList|0x05|Spawn Player}}
+
{{PacketList|{{change|0x05|0x06}}|Entity Animation (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x5C|0x08}}|Player Digging|pre=unchanged}}
+
{{PacketList|{{change|0x06|0x07}}|Statistics|pre=unchanged}}
 +
{{PacketList|{{change|0x07|0x08}}|Acknowledge Player Digging|pre=unchanged}}
 
{{PacketList|{{change|0x08|0x09}}|Block Break Animation|pre=unchanged}}
 
{{PacketList|{{change|0x08|0x09}}|Block Break Animation|pre=unchanged}}
{{PacketList|{{change|0x09|0x0A}}|Update Block Entity|pre=unchanged}}
+
{{PacketList|{{change|0x09|0x0A}}|Block Entity Data|pre=unchanged}}
 
{{PacketList|{{change|0x0A|0x0B}}|Block Action|pre=unchanged}}
 
{{PacketList|{{change|0x0A|0x0B}}|Block Action|pre=unchanged}}
 
{{PacketList|{{change|0x0B|0x0C}}|Block Change|pre=unchanged}}
 
{{PacketList|{{change|0x0B|0x0C}}|Block Change|pre=unchanged}}
Line 32: Line 30:
 
{{PacketList|{{change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
 
{{PacketList|{{change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
 
{{PacketList|{{change|0x0E|0x0F}}|Chat Message (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x0E|0x0F}}|Chat Message (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x0F|0x10}}|Multi Block Change|pre=unchanged}}
+
{{PacketList|{{change|0x0F|0x10}}|Tab-Complete (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x10|0x11}}|Tab-Complete (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x10|0x11}}|Declare Commands|pre=unchanged}}
{{PacketList|{{change|0x11|0x12}}|Declare Commands|pre=unchanged}}
+
{{PacketList|{{change|0x11|0x12}}|Window Confirmation (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x12|0x13}}|Confirm Transaction (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x12|0x13}}|Close Window (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x13|0x14}}|Close Window (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x13|0x14}}|Window Items|pre=unchanged}}
{{PacketList|{{change|0x14|0x15}}|Window Items|pre=unchanged}}
+
{{PacketList|{{change|0x14|0x15}}|Window Property|pre=unchanged}}
{{PacketList|{{change|0x15|0x16}}|Window Property|pre=unchanged}}
+
{{PacketList|{{change|0x15|0x16}}|Set Slot|pre=unchanged}}
{{PacketList|{{change|0x16|0x17}}|Set Slot|pre=unchanged}}
+
{{PacketList|{{change|0x16|0x17}}|Set Cooldown|pre=unchanged}}
{{PacketList|{{change|0x17|0x18}}|Set Cooldown|pre=unchanged}}
+
{{PacketList|{{change|0x17|0x18}}|Plugin Message (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x18|0x19}}|Plugin Message (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x18|0x19}}|Named Sound Effect|pre=unchanged}}
{{PacketList|{{change|0x19|0x1A}}|Named Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x19|0x1A}}|Disconnect (play)|pre=unchanged}}
{{PacketList|{{change|0x1A|0x1B}}|Disconnect (play)|pre=unchanged}}
+
{{PacketList|{{change|0x1A|0x1B}}|Entity Status|pre=unchanged}}
{{PacketList|{{change|0x1B|0x1C}}|Entity Status|pre=unchanged}}
+
{{PacketList|{{change|0x1B|0x1C}}|Explosion|pre=unchanged}}
{{PacketList|{{change|0x1C|0x1D}}|Explosion|pre=unchanged}}
+
{{PacketList|{{change|0x1C|0x1D}}|Unload Chunk|pre=unchanged}}
{{PacketList|{{change|0x1D|0x1E}}|Unload Chunk|pre=unchanged}}
+
{{PacketList|{{change|0x1D|0x1E}}|Change Game State|pre=unchanged}}
{{PacketList|{{change|0x1E|0x1F}}|Change Game State|pre=unchanged}}
+
{{PacketList|{{change|0x1E|0x1F}}|Open Horse Window|pre=unchanged}}
{{PacketList|{{change|0x1F|0x20}}|Open Horse Window|pre=unchanged}}
+
{{PacketList|{{change|0x1F|0x20}}|Keep Alive (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x20|0x21}}|Keep Alive (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x20|0x21}}|Chunk Data}}
{{PacketList|{{change|0x21|0x22}}|Chunk Data}}
+
{{PacketList|{{change|0x21|0x22}}|Effect|pre=unchanged}}
{{PacketList|{{change|0x22|0x23}}|Effect|pre=unchanged}}
+
{{PacketList|{{change|0x22|0x23}}|Particle|pre=unchanged}}
{{PacketList|{{change|0x23|0x24}}|Particle|pre=unchanged}}
+
{{PacketList|{{change|0x23|0x24}}|Update Light}}
{{PacketList|{{change|0x24|0x25}}|Update Light|pre=unchanged}}
+
{{PacketList|{{change|0x24|0x25}}|Join Game|pre=unchanged}}
{{PacketList|{{change|0x25|0x26}}|Join Game}}
+
{{PacketList|{{change|0x25|0x26}}|Map Data}}
{{PacketList|{{change|0x26|0x27}}|Map Data|pre=unchanged}}
+
{{PacketList|{{change|0x26|0x27}}|Trade List|pre=unchanged}}
{{PacketList|{{change|0x27|0x28}}|Trade List|pre=unchanged}}
+
{{PacketList|{{change|0x27|0x28}}|Entity Position|pre=unchanged}}
{{PacketList|{{change|0x28|0x29}}|Entity Relative Move|pre=unchanged}}
+
{{PacketList|{{change|0x28|0x29}}|Entity Position and Rotation|pre=unchanged}}
{{PacketList|{{change|0x29|0x2A}}|Entity Look And Relative Move|pre=unchanged}}
+
{{PacketList|{{change|0x29|0x2A}}|Entity Rotation|pre=unchanged}}
{{PacketList|{{change|0x2A|0x2B}}|Entity Look|pre=unchanged}}
+
{{PacketList|{{change|0x2A|0x2B}}|Entity Movement|pre=unchanged}}
{{PacketList|{{change|0x2B|0x2C}}|Entity|pre=unchanged}}
+
{{PacketList|{{change|0x2B|0x2C}}|Vehicle Move (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x2C|0x2D}}|Vehicle Move (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x2C|0x2D}}|Open Book|pre=unchanged}}
{{PacketList|{{change|0x2D|0x2E}}|Open Book|pre=unchanged}}
+
{{PacketList|{{change|0x2D|0x2E}}|Open Window|pre=unchanged}}
{{PacketList|{{change|0x2E|0x2F}}|Open Window|pre=unchanged}}
+
{{PacketList|{{change|0x2E|0x2F}}|Open Sign Editor|pre=unchanged}}
{{PacketList|{{change|0x2F|0x30}}|Open Sign Editor|pre=unchanged}}
+
{{PacketList|{{change|0x2F|0x30}}|Craft Recipe Response|pre=unchanged}}
{{PacketList|{{change|0x30|0x31}}|Craft Recipe Response|pre=unchanged}}
+
{{PacketList|{{change|0x30|0x31}}|Player Abilities (clientbound)|pre=unchanged}}
{{PacketList|{{change|0x31|0x32}}|Player Abilities (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x31|0x32}}|Combat Event|pre=unchanged}}
{{PacketList|{{change|0x32|0x33}}|Combat Event|pre=unchanged}}
+
{{PacketList|{{change|0x32|0x33}}|Player Info|pre=unchanged}}
{{PacketList|{{change|0x33|0x34}}|Player Info|pre=unchanged}}
+
{{PacketList|{{change|0x33|0x34}}|Face Player|pre=unchanged}}
{{PacketList|{{change|0x34|0x35}}|Face Player|pre=unchanged}}
+
{{PacketList|{{change|0x34|0x35}}|Player Position And Look (clientbound)}}
{{PacketList|{{change|0x35|0x36}}|Player Position And Look (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x35|0x36}}|Unlock Recipes|pre=unchanged}}
{{PacketList|{{change|0x36|0x37}}|Unlock Recipes|pre=unchanged}}
+
{{PacketList|{{change|0x36|0x37}}|Destroy Entities|pre=unchanged}}
{{PacketList|{{change|0x37|0x38}}|Destroy Entities|pre=unchanged}}
+
{{PacketList|{{change|0x37|0x38}}|Remove Entity Effect|pre=unchanged}}
{{PacketList|{{change|0x38|0x39}}|Remove Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x38|0x39}}|Resource Pack Send}}
{{PacketList|{{change|0x39|0x3A}}|Resource Pack Send|pre=unchanged}}
+
{{PacketList|{{change|0x39|0x3A}}|Respawn|pre=unchanged}}
{{PacketList|{{change|0x3A|0x3B}}|Respawn}}
+
{{PacketList|{{change|0x3A|0x3B}}|Entity Head Look|pre=unchanged}}
{{PacketList|{{change|0x3B|0x3C}}|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|0x3C|0x3D}}|Select Advancement Tab|pre=unchanged}}
 
{{PacketList|{{change|0x3D|0x3E}}|World Border|pre=unchanged}}
 
{{PacketList|{{change|0x3D|0x3E}}|World Border|pre=unchanged}}
Line 83: Line 81:
 
{{PacketList|{{change|0x40|0x41}}|Update View Position|pre=unchanged}}
 
{{PacketList|{{change|0x40|0x41}}|Update View Position|pre=unchanged}}
 
{{PacketList|{{change|0x41|0x42}}|Update View Distance|pre=unchanged}}
 
{{PacketList|{{change|0x41|0x42}}|Update View Distance|pre=unchanged}}
{{PacketList|{{change|0x42|0x43}}|Display Scoreboard|pre=unchanged}}
+
{{PacketList|{{change|0x42|0x43}}|Spawn Position|pre=unchanged}}
{{PacketList|{{change|0x43|0x44}}|Entity Metadata|pre=unchanged}}
+
{{PacketList|{{change|0x43|0x44}}|Display Scoreboard|pre=unchanged}}
{{PacketList|{{change|0x44|0x45}}|Attach Entity|pre=unchanged}}
+
{{PacketList|{{change|0x44|0x45}}|Entity Metadata|pre=unchanged}}
{{PacketList|{{change|0x45|0x46}}|Entity Velocity|pre=unchanged}}
+
{{PacketList|{{change|0x45|0x46}}|Attach Entity|pre=unchanged}}
{{PacketList|{{change|0x46|0x47}}|Entity Equipment|pre=unchanged}}
+
{{PacketList|{{change|0x46|0x47}}|Entity Velocity|pre=unchanged}}
{{PacketList|{{change|0x47|0x48}}|Set Experience|pre=unchanged}}
+
{{PacketList|{{change|0x47|0x48}}|Entity Equipment|pre=unchanged}}
{{PacketList|{{change|0x48|0x49}}|Update Health|pre=unchanged}}
+
{{PacketList|{{change|0x48|0x49}}|Set Experience|pre=unchanged}}
{{PacketList|{{change|0x49|0x4A}}|Scoreboard Objective|pre=unchanged}}
+
{{PacketList|{{change|0x49|0x4A}}|Update Health|pre=unchanged}}
{{PacketList|{{change|0x4A|0x4B}}|Set Passengers|pre=unchanged}}
+
{{PacketList|{{change|0x4A|0x4B}}|Scoreboard Objective|pre=unchanged}}
{{PacketList|{{change|0x4B|0x4C}}|Teams|pre=unchanged}}
+
{{PacketList|{{change|0x4B|0x4C}}|Set Passengers|pre=unchanged}}
{{PacketList|{{change|0x4C|0x4D}}|Update Score|pre=unchanged}}
+
{{PacketList|{{change|0x4C|0x4D}}|Teams|pre=unchanged}}
{{PacketList|{{change|0x4D|0x4E}}|Spawn Position|pre=unchanged}}
+
{{PacketList|{{change|0x4D|0x4E}}|Update Score|pre=unchanged}}
 
{{PacketList|{{change|0x4E|0x4F}}|Time Update|pre=unchanged}}
 
{{PacketList|{{change|0x4E|0x4F}}|Time Update|pre=unchanged}}
 
{{PacketList|{{change|0x4F|0x50}}|Title|pre=unchanged}}
 
{{PacketList|{{change|0x4F|0x50}}|Title|pre=unchanged}}
Line 108: Line 106:
 
{{PacketList|{{change|0x59|0x5A}}|Entity Effect|pre=unchanged}}
 
{{PacketList|{{change|0x59|0x5A}}|Entity Effect|pre=unchanged}}
 
{{PacketList|{{change|0x5A|0x5B}}|Declare Recipes|pre=unchanged}}
 
{{PacketList|{{change|0x5A|0x5B}}|Declare Recipes|pre=unchanged}}
{{PacketList|{{change|0x5B|0x5C}}|Tags|pre=unchanged}}
+
{{PacketList|{{change|0x5B|0x5C}}|Tags}}
 +
|-
 +
!colspan="4"| Play serverbound
 +
{{PacketList|0x05|Client Settings}}
 +
|-
 +
!colspan="4"| Handshaking serverbound
 +
{{PacketList|0x00|Handshake}}
 
  |}
 
  |}
  
Line 117: Line 121:
 
== Entity Metadata ==
 
== Entity Metadata ==
  
{{warning2|Lots of shifts, of course}}
+
{{#vardefine:meta_prerelease|1}}
  
=== Living ===
+
{{Warning2|Note that other entities have had metadata shifts due to these changes, not shown here.}}
  
Extends [[#Entity|Entity]].
+
=== Entity ===
 +
 
 +
{{metadata inherit|Entity}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 129: Line 135:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  |rowspan="5"| 7
+
  |rowspan="9"| {{Metadata id|}}
  |rowspan="5"| Byte
+
  |rowspan="9"| Byte
|colspan="2"| Hand states, used to trigger blocking/eating/drinking animation.
 
|rowspan="5"| 0
 
|-
 
 
  ! Bit mask
 
  ! Bit mask
 
  ! Meaning
 
  ! Meaning
 +
|rowspan="9"| 0
 
  |-
 
  |-
 
  | 0x01
 
  | 0x01
  | Is hand active
+
  | Is on fire
 
  |-
 
  |-
 
  | 0x02
 
  | 0x02
  | Active hand (0 = main hand, 1 = offhand)
+
  | Is crouching
 
  |-
 
  |-
 
  | 0x04
 
  | 0x04
  | In riptide spin attack
+
  | Unused (previously riding)
 
  |-
 
  |-
  | 8
+
  | 0x08
  | Float
+
  | Is sprinting
|colspan="2"| Health
 
| 1.0
 
 
  |-
 
  |-
  | 9
+
  | 0x10
  | VarInt
+
  | Is swimming
|colspan="2"| Potion effect color (or 0 if there is no effect)
 
| 0
 
 
  |-
 
  |-
  | 10
+
  | 0x20
  | Boolean
+
  | Is invisible
|colspan="2"| Is potion effect ambient: reduces the number of particles generated by potions to 1/5 the normal amount
 
| false
 
 
  |-
 
  |-
  | 11
+
  | 0x40
  | VarInt
+
  | has glowing effect
|colspan="2"| Number of arrows in entity
 
| 0
 
|- {{Added}}
 
| 12
 
| VarInt
 
|colspan="2"| Unknown
 
| 0
 
 
  |-
 
  |-
  | {{change|12|13}}
+
  | 0x80
  | OptBlockPos
+
  | Is flying with an {{Minecraft Wiki|elytra}}
|colspan="2"| Unknown (Bed location?)
 
| Absent
 
|}
 
 
 
=== Bee ===
 
 
 
Extends [[#Insentient|Insentient]].
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
  | 16
+
  | {{Metadata id|}}
  | Byte
+
  | VarInt
  |colspan="2"| Unknown
+
  |colspan="2"| Air ticks
  | 0
+
  | 300
 
  |-
 
  |-
  | 17
+
  | {{Metadata id|}}
  | VarInt
+
  | OptChat
  |colspan="2"| Unknown
+
  |colspan="2"| Custom name
| 0
+
  | empty
|}
 
 
 
=== Enderman ===
 
 
 
Extends [[#Monster|Monster]].
 
 
 
{| class="wikitable"
 
! Index
 
! Type
 
  !style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
  | 15
+
  | {{Metadata id|}}
  | Opt BlockID
+
  | Boolean
  |colspan="2"| Carried block
+
  |colspan="2"| Is custom name visible
  | Absent
+
  | false
 
  |-
 
  |-
  | 16
+
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is screaming
+
  |colspan="2"| Is silent
 
  | false
 
  | false
  |- {{added}}
+
  |-
| 17
+
| {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Unknown
+
  |colspan="2"| Has no gravity
 
  | false
 
  | false
 +
|-
 +
| {{Metadata id|}}
 +
| Pose
 +
|colspan="2"| Pose
 +
| STANDING
 +
|- {{added}}
 +
| {{Metadata id|added}}
 +
| VarInt
 +
|colspan="2"| Ticks frozen in powdered snow
 +
| 0
 
  |}
 
  |}
  
Line 239: Line 216:
  
 
=== Clientbound ===
 
=== Clientbound ===
==== Spawn Mob ====
 
  
Sent by the server when a mob entity is spawned.
+
==== Sculk Vibration Signal ====
 +
 
 +
{| class="wikitable" {{Added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="4"| 0x05
 +
|rowspan="4"| Play
 +
|rowspan="4"| 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 [https://wiki.vg/Protocol#Data_types 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|Chunk Format}}
 +
{{See also|#Unload Chunk}}
 +
 
 +
{{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 251: Line 264:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="13"| 0x03
+
  |rowspan="13"| {{change|0x20|0x21}}
 
  |rowspan="13"| Play
 
  |rowspan="13"| Play
 
  |rowspan="13"| Client
 
  |rowspan="13"| Client
  | Entity ID
+
  | Chunk X
 +
| Int
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|-
 +
| Chunk Z
 +
| Int
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|- {{removed}}
 +
| Full chunk
 +
| Boolean
 +
| See [[Chunk Format#Full chunk|Chunk Format]]
 +
|- {{removed}}
 +
| 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).
 +
|- {{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
 +
| [[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 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
 +
| VarInt
 +
| Size of Data in bytes
 +
|-
 +
| Data
 +
| Byte array
 +
| See [[Chunk Format#Data structure|data structure]] in Chunk Format
 +
|-
 +
| Number of block entities
 +
| VarInt
 +
| Number of elements in the following array
 +
|-
 +
| Block entities
 +
| 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.
 +
|}
 +
 
 +
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 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"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
!colspan="2"| Field Name
 +
!colspan="2"| Field Type
 +
! Notes
 +
|-
 +
|rowspan="21"| {{change|0x23|0x24}}
 +
|rowspan="21"| Play
 +
|rowspan="21"| Client
 +
|colspan="2"| Chunk X
 +
|colspan="2"| VarInt
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|-
 +
|colspan="2"| Chunk Z
 +
|colspan="2"| VarInt
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|-
 +
|colspan="2"| Trust Edges
 +
|colspan="2"| Boolean
 +
| 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}}
 +
|colspan="2"| Sky Light array count
 +
|colspan="2"| VarInt
 +
| Number of entries in the following array
 +
|-
 +
|rowspan="2"| Sky Light arrays
 +
| Length
 +
|rowspan="2"| 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.
 +
|- {{added}}
 +
|colspan="2"| Block Light array count
 +
|colspan="2"| VarInt
 +
| Number of entries in the following array
 +
|-
 +
|rowspan="2"| Block Light arrays
 +
| Length
 +
|rowspan="2"| Array
 
  | VarInt
 
  | 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 {{Minecraft Wiki|map}} item.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
!colspan="2"| Field Name
 +
!colspan="2"| Field Type
 +
! Notes
 +
|-
 +
|rowspan="18"| {{change|0x25|0x26}}
 +
|rowspan="18"| Play
 +
|rowspan="18"| Client
 +
|colspan="2"| Map ID
 +
|colspan="2"| VarInt
 +
| Map ID of the map being modified
 +
|-
 +
|colspan="2"| Scale
 +
|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)
 +
|- {{removed}}
 +
|colspan="2"| Tracking Position
 +
|colspan="2"| Boolean
 +
| Specifies whether player and item frame icons are shown
 +
|-
 +
|colspan="2"| Locked
 +
|colspan="2"| Boolean
 +
| 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
 
  |-
 
  |-
  | Entity UUID
+
  |colspan="2"| Icon Count
  | UUID
+
  |colspan="2"| VarInt
  |  
+
  | Number of elements in the following array. {{change||Only present if "Tracking Position" is true.}}
 
  |-
 
  |-
 +
|rowspan="6"| Icon
 
  | Type
 
  | Type
  | VarInt
+
|rowspan="6"| Array
  | The type of mob. See [[Entities#Mobs]]
+
  | VarInt enum
 +
  | See below
 
  |-
 
  |-
 
  | X
 
  | X
  | Double
+
  | 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
 +
|-
 +
|colspan="2"| Columns
 +
|colspan="2"| Unsigned Byte
 +
| Number of columns updated
 +
|-
 +
|colspan="2"| Rows
 +
|colspan="2"| Optional Byte
 +
| Only if Columns is more than 0; number of rows updated
 +
|-
 +
|colspan="2"| X
 +
|colspan="2"| Optional Byte
 +
| Only if Columns is more than 0; x offset of the westernmost column
 +
|-
 +
|colspan="2"| Z
 +
|colspan="2"| Optional Byte
 +
| Only if Columns is more than 0; z offset of the northernmost row
 +
|-
 +
|colspan="2"| Length
 +
|colspan="2"| Optional VarInt
 +
| Only if Columns is more than 0; length of the following array
 +
|-
 +
|colspan="2"| Data
 +
|colspan="2"| Optional Array of Unsigned Byte
 +
| Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
 +
|}
 +
 
 +
For icons, a direction of 0 is a vertical icon and increments by 22.5&deg; (360/16).
 +
 
 +
Types are based off of rows and columns in <code>map_icons.png</code>:
 +
 
 +
{| class="wikitable"
 +
|-
 +
! 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
 
  |-
 
  |-
  | Y
+
  | 19
| Double
+
  | Cyan Banner
  |  
 
 
  |-
 
  |-
  | Z
+
  | 20
| Double
+
  | Purple Banner
  |  
 
 
  |-
 
  |-
  | Yaw
+
  | 21
| Angle
+
  | Blue Banner
  |  
 
 
  |-
 
  |-
  | Pitch
+
  | 22
| Angle
+
  | Brown Banner
  |  
 
 
  |-
 
  |-
  | Head Pitch
+
  | 23
| Angle
+
  | Green Banner
  |  
 
 
  |-
 
  |-
  | Velocity X
+
  | 24
  | Short
+
  | Red Banner
| Same units as [[#Entity Velocity|Entity Velocity]]
 
 
  |-
 
  |-
  | Velocity Y
+
  | 25
  | Short
+
  | Black Banner
| Same units as [[#Entity Velocity|Entity Velocity]]
 
 
  |-
 
  |-
  | Velocity Z
+
  | 26
| Short
+
  | Treasure marker
| Same units as [[#Entity Velocity|Entity Velocity]]
 
|- {{removed}}
 
| Metadata
 
| [[Entities#Entity Metadata Format|Entity Metadata]]
 
  |  
 
 
  |}
 
  |}
  
==== Spawn Player ====
+
==== 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.
  
This packet is sent by the server when a player comes into visible range, ''not'' when a player joins.
+
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?)”.
  
This packet must be sent after the [[#Player Info|Player Info]] packet that adds the player data for the client to use when spawning a player. If the Player Info for the player spawned by this packet is not present when this packet arrives, Notchian clients will not spawn the player entity. The Player Info packet includes skin/cape data.
+
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”.
  
Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.
+
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.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 323: Line 636:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="8"| 0x05
+
  |rowspan="8"| {{change|0x34|0x35}}
 
  |rowspan="8"| Play
 
  |rowspan="8"| Play
 
  |rowspan="8"| Client
 
  |rowspan="8"| Client
| Entity ID
 
| VarInt
 
| Player's EID
 
|-
 
| Player UUID
 
| UUID
 
| See below for notes on {{Minecraft Wiki|Server.properties#online-mode|offline mode}} and NPCs
 
|-
 
 
  | X
 
  | X
 
  | Double
 
  | Double
  |  
+
  | Absolute or relative position, depending on Flags.
 
  |-
 
  |-
 
  | Y
 
  | Y
 
  | Double
 
  | Double
  |  
+
  | Absolute or relative position, depending on Flags.
 
  |-
 
  |-
 
  | Z
 
  | Z
 
  | Double
 
  | Double
  |  
+
  | Absolute or relative position, depending on Flags.
 
  |-
 
  |-
 
  | Yaw
 
  | Yaw
  | Angle
+
  | Float
  |  
+
  | Absolute or relative rotation on the X axis, in degrees.
 
  |-
 
  |-
 
  | Pitch
 
  | Pitch
  | Angle
+
  | Float
  |  
+
  | Absolute or relative rotation on the Y axis, in degrees.
  |- {{removed}}
+
  |-
  | Metadata
+
  | Flags
  | [[Entities#Entity Metadata Format|Entity Metadata]]
+
| Byte
  |  
+
| Bit field, see below.
 +
|-
 +
| Teleport ID
 +
| VarInt
 +
  | Client should confirm this packet with [[#Teleport Confirm|Teleport Confirm]] containing the same Teleport ID.
 +
|- {{added}}
 +
| Dismount Vehicle
 +
| Boolean
 +
  | True if the player should dismount their vehicle.
 
  |}
 
  |}
  
When in {{Minecraft Wiki|Server.properties#online-mode|online mode}}, the UUIDs must be valid and have valid skin blobs.
+
About the Flags field:
  
In offline mode, [[Wikipedia:Universally unique identifier#Versions 3 and 5 (namespace name-based)|UUID v3]] is used with the String <code>OfflinePlayer:&lt;player name&gt;</code>, encoded in UTF-8 (and case-sensitive).
+
<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
  
For NPCs UUID v2 should be used. Note:
+
{| class="wikitable"
 +
|-
 +
! Field
 +
! Bit
 +
|-
 +
| X
 +
| 0x01
 +
|-
 +
| Y
 +
| 0x02
 +
|-
 +
| Z
 +
| 0x04
 +
|-
 +
| Y_ROT
 +
| 0x08
 +
|-
 +
| X_ROT
 +
| 0x10
 +
|}
  
<+Grum> i will never confirm this as a feature you know that :)
+
==== Resource Pack Send ====  
 
 
In an example UUID, <code>xxxxxxxx-xxxx-Yxxx-xxxx-xxxxxxxxxxxx</code>, the UUID version is specified by <code>Y</code>. So, for UUID v3, <code>Y</code> will always be <code>3</code>, and for UUID v2, <code>Y</code> will always be <code>2</code>.
 
 
 
==== Update Block Entity ====
 
 
 
Sets the block entity associated with the block at the given location.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 381: Line 707:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{change|0x09|0x0A}}
+
  |rowspan="3"| {{change|0x38|0x39}}
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
 
  |rowspan="3"| Client
 
  |rowspan="3"| Client
  | Location
+
  | URL
  | Position
+
  | String (32767)
  |  
+
  | The URL to the resource pack.
 
  |-
 
  |-
  | Action
+
  | Hash
  | Unsigned Byte
+
  | String (40)
  | The type of update to perform, see below
+
  | 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}}
  | NBT Data
+
  | Forced
  | [[NBT|NBT Tag]]
+
  | Boolean
  | 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)
+
  | The notchian client will be forced to use the resource pack from the server. If they decline they will be kicked from the server.
 
  |}
 
  |}
  
''Action'' field:
+
==== Tags ====
 
 
* '''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''': Unused
 
* '''11''': Declare a bed
 
* '''12''': Set data of a jigsaw block
 
* '''13''': Set items in a campfire
 
* {{change||'''14''': Beehive information}}
 
 
 
==== Chunk Data ====
 
{{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"
 
{| class="wikitable"
Line 424: Line 729:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="10"| {{change|0x21|0x22}}
+
  |rowspan="8"| {{change|0x5B|0x5C}}
  |rowspan="10"| Play
+
  |rowspan="8"| Play
  |rowspan="10"| Client
+
  |rowspan="8"| Client
  | Chunk X
+
  |- {{removed}}
  | Int
+
  | colspan="2"| Block Tags
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | colspan="2"| (See below)
 +
| IDs are block IDs
 +
|- {{removed}}
 +
| colspan="2"| Item Tags
 +
| colspan="2"| (See below)
 +
| IDs are item IDs
 +
|- {{removed}}
 +
| colspan="2"| Fluid Tags
 +
| colspan="2"| (See below)
 +
| IDs are fluid IDs
 +
|- {{removed}}
 +
| colspan="2"| Entity Tags
 +
| colspan="2"| (See below)
 +
| 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>)
 
  |-
 
  |-
  | Chunk Z
+
  | Array of Tag
  | Int
+
  | (See below)
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
|
 +
|}
 +
 
 +
Tags look like:
 +
 
 +
{| class="wikitable"
 +
!colspan="2"| Field Name
 +
  !colspan="2"| Field Type
 +
! Notes
 
  |-
 
  |-
  | Full chunk
+
  |colspan="2"| Length
| Boolean
+
  |colspan="2"| VarInt
  | See [[Chunk Format#Full chunk|Chunk Format]]
+
  | Number of elements in the following array
|-
 
| 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).
 
|-
 
| 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 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.
 
|- {{Added}}
 
| Biomes
 
| Optional array of Integer
 
| 1024 biome IDs, unknown order.  Not present if full chunk is false.
 
|-
 
| Size
 
| VarInt
 
| Size of Data in bytes
 
 
  |-
 
  |-
  | Data
+
  |rowspan="3"| Tags
  | Byte array
+
  | Tag name
  | See [[Chunk Format#Data structure|data structure]] in Chunk Format
+
  |rowspan="3"| Array
 +
| Identifier
 +
|
 
  |-
 
  |-
  | Number of block entities
+
  | Count
 
  | VarInt
 
  | VarInt
 
  | Number of elements in the following array
 
  | Number of elements in the following array
 
  |-
 
  |-
  | Block entities
+
  | Entries
  | Array of [[NBT|NBT Tag]]
+
  | Array of VarInt
  | All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
+
  | Numeric ID of the given type (block, item, etc.).
 
  |}
 
  |}
  
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.
 
  
==== Join Game ====
+
=== Serverbound ===
 +
 
 +
==== Client Settings ====
  
See [[Protocol Encryption]] for information on logging in.
+
Sent when the player connects, or when settings are changed.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 486: Line 809:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| {{change|0x25|0x26}}
+
  |rowspan="7"| 0x05
  |rowspan="9"| Play
+
  |rowspan="7"| Play
  |rowspan="9"| Client
+
  |rowspan="7"| Server
  | Entity ID
+
  | Locale
  | Int
+
  | String (16)
| The player's Entity ID (EID)
+
  | e.g. <code>en_GB</code>.
  |-
 
| Gamemode
 
| Unsigned Byte
 
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. Bit 3 (0x8) is the hardcore flag.
 
|-
 
| Dimension
 
| Int Enum
 
| -1: Nether, 0: Overworld, 1: End; also, note that this is not a VarInt but instead a regular int.
 
|- {{Added}}
 
| Unknown
 
| Long
 
| Unknown
 
|-
 
| Max Players
 
| Unsigned Byte
 
| Was once used by the client to draw the player list, but now is ignored
 
|-
 
| Level Type
 
| String Enum (16)
 
| default, flat, largeBiomes, amplified, customized, buffet, default_1_1
 
 
  |-
 
  |-
 
  | View Distance
 
  | View Distance
  | VarInt
+
  | Byte
  | Render distance (2-32)
+
  | Client-side render distance, in chunks.
 
  |-
 
  |-
  | Reduced Debug Info
+
  | Chat Mode
  | Boolean
+
  | VarInt Enum
  | If true, a Notchian client shows reduced information on the {{Minecraft Wiki|debug screen}}For servers in development, this should almost always be false.
+
  | 0: enabled, 1: commands only, 2: hiddenSee [[Chat#Processing chat|processing chat]] for more information.
 
  |-
 
  |-
  | Unknown
+
  | Chat Colors
 
  | Boolean
 
  | Boolean
  | Added
+
  | “Colors” multiplayer setting.
|}
 
 
 
==== Respawn ====
 
 
 
To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet. You do not need to unload chunks, the client will do it automatically.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="4"| {{change|0x3A|0x3B}}
 
|rowspan="4"| Play
 
|rowspan="4"| Client
 
| Dimension
 
| Int Enum
 
| -1: The Nether, 0: The Overworld, 1: The End
 
|- {{added}}
 
| Unknown
 
| Long
 
| Unknown
 
 
  |-
 
  |-
  | Gamemode
+
  | Displayed Skin Parts
 
  | Unsigned Byte
 
  | Unsigned Byte
  | 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
+
  | Bit mask, see below.
 
  |-
 
  |-
  | Level Type
+
  | Main Hand
  | String (16)
+
  | VarInt Enum
  | Same as [[#Join Game|Join Game]]
+
| 0: Left, 1: Right.
 +
|- {{Added}}
 +
| Disable text filtering
 +
  | Boolean
 +
| Disables filtering of text on signs and written book titles.  Currently always true (i.e. the filtering is disabled)
 
  |}
 
  |}
  
{{Warning2|Avoid changing player's dimension to same dimension they were already in unless they are dead. If you change the dimension to one they are already in, weird bugs can occur, such as the player being unable to attack other players in new world (until they die and respawn).
+
''Displayed Skin Parts'' flags:
  
If you must respawn a player in the same dimension without killing them, send two respawn packets, one to a different world and then another to the world you want. You do not need to complete the first respawn; it only matters that you send two packets.}}
+
* 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
  
=== Serverbound ===
+
The most significant bit (bit 7, 0x80) appears to be unused.
 
 
No changes so far.
 
  
 
== Handshaking ==
 
== Handshaking ==
Line 591: Line 878:
 
  | Protocol Version
 
  | Protocol Version
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently {{change|498|556}})
+
  | See [[protocol version numbers]] (currently {{change|754|{{Snapshot PVN|1073741839}}}})
 
  |-
 
  |-
 
  | Server Address
 
  | Server Address

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.