Difference between revisions of "Pre-release protocol"

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(Added changes for block entity data and chunk data & update light combined packet)
(Updated to 1.21-pre2)
 
(129 intermediate revisions by 16 users not shown)
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−
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|21w44a, protocol {{Snapshot PVN|1073741872}}]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
+
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.20.6, protocol 766]]) to the current pre-release (currently [[Protocol version numbers|1.21-pre2, protocol {{Snapshot PVN|1073742024}}]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
  
 
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
 
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
Line 9: Line 9:
 
=== Data types ===
 
=== Data types ===
  
−
No changes so far.
+
No changes documented so far.
  
 
=== Packets ===
 
=== Packets ===
−
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 19: Line 18:
 
  !colspan="2"| Documentation
 
  !colspan="2"| Documentation
 
  |-
 
  |-
−
!colspan="4"| Play clientbound
+
!colspan="4"| Configuration clientbound
−
{{PacketList|0x0A|Block Entity Data}}
+
{{PacketList|0x0F|Clientbound Report Details (configuration)|rel=added}}
−
{{PacketList|0x22|Chunk Data and Update Light}}
+
{{PacketList|0x10|Clientbound Server Links (configuration)|rel=added}}
−
  |}
+
|-
 +
!colspan="4"| Play clientbound
 +
{{PacketList|0x7A|Clientbound Report Details (play)|rel=added}}
 +
{{PacketList|0x7B|Clientbound Server Links (play)|rel=added}}
 +
  |-
 +
|}
  
−
== New/modified data types ==
+
== Handshake ==
  
 
No changes so far.
 
No changes so far.
  
−
== Entity Metadata ==
+
== Status ==
  
 
No changes so far.
 
No changes so far.
  
−
=== Entity ===
+
== Login ==
  
 
No changes so far.
 
No changes so far.
  
−
== Block Actions ==
+
== Configuration ==
−
 
 
−
No changes so far.
 
−
 
 
−
== Inventories ==
 
−
 
 
−
No changes so far.
 
−
 
 
−
== Plugin Channels ==
 
−
 
 
−
No changes so far.
 
−
 
 
−
== Play ==
 
  
 
=== Clientbound ===
 
=== Clientbound ===
  
−
==== Block Entity Data ====
+
==== Clientbound Report Details (configuration) ====
  
−
Sets the block entity associated with the block at the given location.
+
Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
−
  ! Field Name
+
  ! colspan="2"| Field Name
−
  ! Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  |rowspan="3"| 0x0A
+
  | rowspan="3"| 0x0F
−
  |rowspan="3"| Play
+
  | rowspan="3"| Configuration
−
  |rowspan="3"| Client
+
  | rowspan="3"| Client
−
  | Location
+
  | colspan="2"| Details Count
−
| Position
+
  | colspan="2"| {{Type|VarInt}} (32)
−
  |  
+
  | The number of details in the following array.
−
|- {{removed}}
+
  |-
−
  | Action
+
| rowspan="2"| Details
−
  | Unsigned Byte
+
  | Title
−
  | The type of update to perform, see below.
+
  | rowspan="2"| {{Type|Array}}
−
  |- {{added}}
+
  | {{Type|String}} (128)
−
  | Type
+
  |
−
| VarInt
 
−
  | The type of block entity
 
 
  |-
 
  |-
−
  | NBT Data
+
  | Description
−
  | [[NBT|NBT Tag]]
+
  | {{Type|String}} (4096)
−
| Data to set.  May be a TAG_END (0), in which case the block entity at the given location is removed (though this is not required since the client will remove the block entity automatically on chunk unload or block removal).
+
  |
−
  |}
+
|}
−
 
 
−
==== Chunk Data and Update Light ====
 
−
{{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)}}
+
==== Clientbound Server Links (configuration) ====
  
−
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).
+
This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
−
  !colspan="2"| Field Name
+
  ! colspan="2"| Field Name
−
  !colspan="2"| Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  |rowspan="32"| {{change|0x20|0x22}}
+
  | rowspan="4"| 0x10
−
  |rowspan="32"| Play
+
  | rowspan="4"| Configuration
−
  |rowspan="32"| Client
+
  | rowspan="4"| Client
−
  |colspan="2"| Chunk X
+
  | colspan="2"| Links Count
−
  |colspan="2"| Int
+
  | colspan="2"| {{Type|VarInt}}
−
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | The number of links in the following array.
 
  |-
 
  |-
−
  |colspan="2"| Chunk Z
+
  | rowspan="3"| Links
−
|colspan="2"| Int
+
  | Is built-in
−
| Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | rowspan="3"| {{Type|Array}}
−
  |- {{removed}}
+
  | {{Type|Boolean}}
−
  |colspan="2"| Bit Mask Length
+
  | Determines if the following label is built-in (from enum) or custom (text component).
−
|colspan="2"| VarInt
 
−
| Length of the following array
 
−
  |- {{removed}}
 
−
  |colspan="2"| Primary Bit Mask
 
−
|colspan="2"| 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).
 
 
  |-
 
  |-
−
  |colspan="2"| Heightmaps
+
  | Label
−
|colspan="2"| [[NBT]]
+
  | {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
−
| 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.
+
  | See below.
−
  |- {{removed}}
 
−
|colspan="2"| Biomes length
 
−
|colspan="2"| VarInt
 
−
| Size of the following array; should always be 1024.  {{change|Not present if full chunk is false.|}}
 
−
|- {{removed}}
 
−
  |colspan="2"| Biomes
 
−
|colspan="2"| 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]].
 
−
|-
 
−
|colspan="2"| Size
 
−
|colspan="2"| VarInt
 
−
| Size of Data in bytes
 
 
  |-
 
  |-
−
  |colspan="2"| Data
+
  | URL
−
  |colspan="2"| Byte array
+
| {{Type|String}}
−
  | See [[Chunk Format#Data structure|data structure]] in Chunk Format
+
| Valid URL.
 +
|}
 +
 
 +
 
 +
{| class="wikitable" {{added}}
 +
! ID
 +
! Name
 +
! Notes
 +
|-
 +
| 0
 +
| Bug Report
 +
| Displayed on connection error screen; included as a comment in the disconnection report.
 +
|-
 +
| 1
 +
| Community Guidelines
 +
|
 +
|-
 +
  | 2
 +
| Support
 +
|
 +
|-
 +
| 3
 +
| Status
 +
|
 +
|-
 +
| 4
 +
| Feedback
 +
|
 +
|-
 +
| 5
 +
| Community
 +
|
 +
|-
 +
| 6
 +
| Website
 +
|
 +
|-
 +
| 7
 +
| Forums
 +
|
 +
|-
 +
| 8
 +
| News
 +
|
 +
|-
 +
| 9
 +
  | Announcements
 +
|  
 
  |-
 
  |-
−
|colspan="2"| Number of block entities
 
−
|colspan="2"| VarInt
 
−
| Number of elements in the following array
 
−
|- {{removed}}
 
−
|colspan="2"| Block entities
 
−
|colspan="2"| 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.
 
−
|- {{added}}
 
−
|rowspan="4" | Block Entity
 
−
| Packed XZ
 
−
|rowspan="4" | Array
 
−
| Byte
 
−
| The packed section coordinates, calculated from ((blockX & 15) << 4) | (blockZ & 15)
 
−
|- {{added}}
 
−
| Y
 
−
| Short
 
−
| The height relative to the world
 
−
|- {{added}}
 
−
| Type
 
−
| VarInt
 
−
| The type of block entity
 
−
|- {{added}}
 
−
| Data
 
−
| [[NBT]]
 
−
| The block entity's data, without the X, Y, and Z values
 
−
|- {{added}}
 
−
|colspan="2"| Trust Edges
 
−
|colspan="2"| Boolean
 
−
| If edges should be trusted for light updates.
 
−
|- {{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
 
−
|- {{added}}
 
−
|rowspan="2"| Sky Light arrays
 
−
| Length
 
−
|rowspan="2"| Array
 
−
| VarInt
 
−
| Length of the following array in bytes (always 2048)
 
−
|- {{added}}
 
−
| 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
 
−
|- {{added}}
 
−
|rowspan="2"| Block Light arrays
 
−
| Length
 
−
|rowspan="2"| Array
 
−
| VarInt
 
−
| Length of the following array in bytes (always 2048)
 
−
|- {{added}}
 
−
| 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.
 
 
  |}
 
  |}
−
 
−
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>
 
  
 
=== Serverbound ===
 
=== Serverbound ===
Line 243: Line 160:
 
No changes so far.
 
No changes so far.
  
−
== Status ==
+
== Play ==
  
 
=== Clientbound ===
 
=== Clientbound ===
  
−
No changes so far.
+
==== Clientbound Report Details (play) ====
 +
 
 +
Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.
  
−
=== Serverbound ===
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="3"| 0x7A
 +
| rowspan="3"| Configuration
 +
| rowspan="3"| Client
 +
| colspan="2"| Details Count
 +
| colspan="2"| {{Type|VarInt}} (32)
 +
| The number of details in the following array.
 +
|-
 +
| rowspan="2"| Details
 +
| Title
 +
| rowspan="2"| {{Type|Array}}
 +
| {{Type|String}} (128)
 +
|
 +
|-
 +
| Description
 +
| {{Type|String}} (4096)
 +
|
 +
|}
  
−
No changes so far.
+
==== Clientbound Server Links (play) ====
  
−
== Login ==
+
This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).
  
−
=== Clientbound ===
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="4"| 0x7B
 +
| rowspan="4"| Configuration
 +
| rowspan="4"| Client
 +
| colspan="2"| Links Count
 +
| colspan="2"| {{Type|VarInt}}
 +
| The number of links in the following array.
 +
|-
 +
| rowspan="3"| Links
 +
| Is built-in
 +
| rowspan="3"| {{Type|Array}}
 +
| {{Type|Boolean}}
 +
| Determines if the following label is built-in (from enum) or custom (text component).
 +
|-
 +
| Label
 +
| {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
 +
| See below.
 +
|-
 +
| URL
 +
| {{Type|String}}
 +
| Valid URL.
 +
|}
  
−
No changes so far.
+
{| class="wikitable" {{added}}
 +
! ID
 +
! Name
 +
! Notes
 +
|-
 +
| 0
 +
| Bug Report
 +
| Displayed on connection error screen; included as a comment in the disconnection report.
 +
|-
 +
| 1
 +
| Community Guidelines
 +
|
 +
|-
 +
| 2
 +
| Support
 +
|
 +
|-
 +
| 3
 +
| Status
 +
|
 +
|-
 +
| 4
 +
| Feedback
 +
|
 +
|-
 +
| 5
 +
| Community
 +
|
 +
|-
 +
| 6
 +
| Website
 +
|
 +
|-
 +
| 7
 +
| Forums
 +
|
 +
|-
 +
| 8
 +
| News
 +
|
 +
|-
 +
| 9
 +
| Announcements
 +
|
 +
|-
 +
|}
  
 
=== Serverbound ===
 
=== Serverbound ===
  
 
No changes so far.
 
No changes so far.
−
 
  
 
[[Category:Minecraft Modern]]
 
[[Category:Minecraft Modern]]

Latest revision as of 10:40, 8 June 2024

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

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

Contents

Data types

No changes documented so far.

Packets

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

Handshake

No changes so far.

Status

No changes so far.

Login

No changes so far.

Configuration

Clientbound

Clientbound Report Details (configuration)

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

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

Clientbound Server Links (configuration)

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

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


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

Serverbound

No changes so far.

Play

Clientbound

Clientbound Report Details (play)

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

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

Clientbound Server Links (play)

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

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