Difference between revisions of "Pre-release protocol"

From wiki.vg
Jump to navigation Jump to search
(1.16.4 -> 1.16.5)
(Switched to difference between 1.17.1 and 1.18 experimental snapshot 2)
Tag: Replaced
 
(35 intermediate revisions by 9 users not shown)
Line 1: Line 1:
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|20w51a, protocol {{Snapshot PVN|1073741833}}]]). 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|1.17.1, protocol 756]]) to the current pre-release (currently [[Protocol version numbers|1.18 experimental snapshot 2, protocol {{Snapshot PVN|1073741866}}]]). 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 13: Line 13:
 
=== Packets ===
 
=== Packets ===
  
{| class="wikitable"
+
No changes so far.
! ID
 
! Packet name
 
!colspan="2"| Documentation
 
|-
 
!colspan="4"| Play clientbound
 
{{PacketList|0x05|Sculk Vibration Signal|rel=added}}
 
{{PacketList|{{change|0x05|0x06}}|Entity Animation (clientbound)|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|0x09|0x0A}}|Block Entity Data|pre=unchanged}}
 
{{PacketList|{{change|0x0A|0x0B}}|Block Action|pre=unchanged}}
 
{{PacketList|{{change|0x0B|0x0C}}|Block Change|pre=unchanged}}
 
{{PacketList|{{change|0x0C|0x0D}}|Boss Bar|pre=unchanged}}
 
{{PacketList|{{change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
 
{{PacketList|{{change|0x0E|0x0F}}|Chat Message (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x0F|0x10}}|Tab-Complete (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x10|0x11}}|Declare Commands|pre=unchanged}}
 
{{PacketList|{{change|0x11|0x12}}|Window Confirmation (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x12|0x13}}|Close Window (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x13|0x14}}|Window Items|pre=unchanged}}
 
{{PacketList|{{change|0x14|0x15}}|Window Property|pre=unchanged}}
 
{{PacketList|{{change|0x15|0x16}}|Set Slot|pre=unchanged}}
 
{{PacketList|{{change|0x16|0x17}}|Set Cooldown|pre=unchanged}}
 
{{PacketList|{{change|0x17|0x18}}|Plugin Message (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x18|0x19}}|Named Sound Effect|pre=unchanged}}
 
{{PacketList|{{change|0x19|0x1A}}|Disconnect (play)|pre=unchanged}}
 
{{PacketList|{{change|0x1A|0x1B}}|Entity Status|pre=unchanged}}
 
{{PacketList|{{change|0x1B|0x1C}}|Explosion|pre=unchanged}}
 
{{PacketList|{{change|0x1C|0x1D}}|Unload Chunk|pre=unchanged}}
 
{{PacketList|{{change|0x1D|0x1E}}|Change Game State|pre=unchanged}}
 
{{PacketList|{{change|0x1E|0x1F}}|Open Horse Window|pre=unchanged}}
 
{{PacketList|{{change|0x1F|0x20}}|Keep Alive (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x20|0x21}}|Chunk Data}}
 
{{PacketList|{{change|0x21|0x22}}|Effect|pre=unchanged}}
 
{{PacketList|{{change|0x22|0x23}}|Particle|pre=unchanged}}
 
{{PacketList|{{change|0x23|0x24}}|Update Light}}
 
{{PacketList|{{change|0x24|0x25}}|Join Game|pre=unchanged}}
 
{{PacketList|{{change|0x25|0x26}}|Map Data}}
 
{{PacketList|{{change|0x26|0x27}}|Trade List|pre=unchanged}}
 
{{PacketList|{{change|0x27|0x28}}|Entity Position|pre=unchanged}}
 
{{PacketList|{{change|0x28|0x29}}|Entity Position and Rotation|pre=unchanged}}
 
{{PacketList|{{change|0x29|0x2A}}|Entity Rotation|pre=unchanged}}
 
{{PacketList|{{change|0x2A|0x2B}}|Entity Movement|pre=unchanged}}
 
{{PacketList|{{change|0x2B|0x2C}}|Vehicle Move (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x2C|0x2D}}|Open Book|pre=unchanged}}
 
{{PacketList|{{change|0x2D|0x2E}}|Open Window|pre=unchanged}}
 
{{PacketList|{{change|0x2E|0x2F}}|Open Sign Editor|pre=unchanged}}
 
{{PacketList|{{change|0x2F|0x30}}|Craft Recipe Response|pre=unchanged}}
 
{{PacketList|{{change|0x30|0x31}}|Player Abilities (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x31|0x32}}|Combat Event|pre=unchanged}}
 
{{PacketList|{{change|0x32|0x33}}|Player Info|pre=unchanged}}
 
{{PacketList|{{change|0x33|0x34}}|Face Player|pre=unchanged}}
 
{{PacketList|{{change|0x34|0x35}}|Player Position And Look (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x35|0x36}}|Unlock Recipes|pre=unchanged}}
 
{{PacketList|{{change|0x36|0x37}}|Destroy Entities|pre=unchanged}}
 
{{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"| Handshaking serverbound
 
{{PacketList|0x00|Handshake}}
 
|}
 
  
 
== New/modified data types ==
 
== New/modified data types ==
Line 118: Line 21:
 
== Entity Metadata ==
 
== Entity Metadata ==
  
{{#vardefine:meta_prerelease|1}}
+
No changes so far.
 
 
{{Warning2|Note that other entities have had metadata shifts due to these changes, not shown here.}}
 
  
 
=== Entity ===
 
=== Entity ===
  
{{metadata inherit|Entity}}
+
No changes so far.
 
 
{| class="wikitable"
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
|rowspan="9"| {{Metadata id|}}
 
|rowspan="9"| Byte
 
! Bit mask
 
! Meaning
 
|rowspan="9"| 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 {{Minecraft Wiki|elytra}}
 
|-
 
| {{Metadata id|}}
 
| VarInt
 
|colspan="2"| Air ticks
 
| 300
 
|-
 
| {{Metadata id|}}
 
| OptChat
 
|colspan="2"| Custom name
 
| empty
 
|-
 
| {{Metadata id|}}
 
| Boolean
 
|colspan="2"| Is custom name visible
 
| false
 
|-
 
| {{Metadata id|}}
 
| Boolean
 
|colspan="2"| Is silent
 
| false
 
|-
 
| {{Metadata id|}}
 
| Boolean
 
|colspan="2"| Has no gravity
 
| false
 
|-
 
| {{Metadata id|}}
 
| Pose
 
|colspan="2"| Pose
 
| STANDING
 
|- {{added}}
 
| {{Metadata id|added}}
 
| VarInt
 
|colspan="2"| Ticks frozen in powdered snow
 
| 0
 
|}
 
  
 
== Block Actions ==
 
== Block Actions ==
Line 214: Line 43:
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Sculk Vibration Signal ====
+
No changes so far.
 
 
{| 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 long 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"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="11"| {{change|0x20|0x21}}
 
|rowspan="11"| Play
 
|rowspan="11"| 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)
 
|- {{removed}}
 
| Full chunk
 
| Boolean
 
| See [[Chunk Format#Full chunk|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).
 
|-
 
| 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
 
| VarInt
 
| Size of the following array.  {{change|Not present if full chunk is false.|}}
 
|-
 
| Biomes
 
| Array of VarInt
 
| <s>1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.</s> Possibly something else.  {{change|Not present if full chunk is false.|}}
 
|-
 
| 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
 
| 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
 
|-
 
|colspan="2"| Icon Count
 
|colspan="2"| VarInt
 
| Number of elements in the following array. {{change||Only present if "Tracking Position" is true.}}
 
|-
 
|rowspan="6"| Icon
 
| Type
 
|rowspan="6"| 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
 
|-
 
|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
 
|-
 
| 19
 
| Cyan Banner
 
|-
 
| 20
 
| Purple Banner
 
|-
 
| 21
 
| Blue Banner
 
|-
 
| 22
 
| Brown Banner
 
|-
 
| 23
 
| Green Banner
 
|-
 
| 24
 
| Red Banner
 
|-
 
| 25
 
| Black Banner
 
|-
 
| 26
 
| Treasure marker
 
|}
 
 
 
 
 
 
 
==== Resource Pack Send ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| {{change|0x38|0x39}}
 
|rowspan="3"| Play
 
|rowspan="3"| Client
 
| URL
 
| String (32767)
 
| The URL to the resource pack.
 
|-
 
| Hash
 
| String (40)
 
| 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}}
 
| 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 ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
|-
 
|rowspan="8"| {{change|0x5B|0x5C}}
 
|rowspan="8"| Play
 
|rowspan="8"| Client
 
|- {{removed}}
 
| colspan="2"| Block Tags
 
| 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>)
 
|-
 
| Array of Tag
 
| (See below)
 
|
 
|}
 
 
 
Tags look like:
 
 
 
{| class="wikitable"
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
|-
 
|colspan="2"| Length
 
|colspan="2"| VarInt
 
| Number of elements in the following array
 
|-
 
|rowspan="3"| Tags
 
| Tag name
 
|rowspan="3"| 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 ===
 
=== Serverbound ===
  
 
No changes so far.
 
No changes so far.
 
== Handshaking ==
 
 
=== Clientbound ===
 
 
There are no clientbound packets in the Handshaking state, since the protocol immediately switches to a different state after the client sends the first packet.
 
 
=== Serverbound ===
 
 
==== Handshake ====
 
 
This causes the server to switch into the target state.
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="4"| 0x00
 
|rowspan="4"| Handshaking
 
|rowspan="4"| Server
 
| Protocol Version
 
| VarInt
 
| See [[protocol version numbers]] (currently {{change|754|{{Snapshot PVN|1073741833}}}})
 
|-
 
| 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|status]], 2 for [[#Login|login]]
 
|}
 
  
 
== Status ==
 
== Status ==

Latest revision as of 22:32, 7 August 2021

This page documents the changes from the last stable Minecraft release (currently 1.17.1, protocol 756) to the current pre-release (currently 1.18 experimental snapshot 2, protocol Snapshot 42). 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

No changes so far.

New/modified data types

No changes so far.

Entity Metadata

No changes so far.

Entity

No changes so far.

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Play

Clientbound

No changes so far.

Serverbound

No changes so far.

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

No changes so far.

Serverbound

No changes so far.