Difference between revisions of "Pre-release protocol"

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(Updated to 1.21-pre2)
 
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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently 1.7.4, protocol 4) to the current pre-release. 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.
−
He 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 occured to the respective packets there.
 
  
−
== Protocol History ==
+
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.
  
−
=== 14w02a ===
+
== Contents ==
  
−
* Added 'Position' to Chat Message Clientbound
+
<div style="float:right;">__TOC__</div>
−
* Remove Player Position And Look's 'OnGround' clientbound
 
−
* Added 'Flags' to Player Position And Look clientbound
 
−
* Changed Open Inventory's 'Inventory Type' type from byte to string
 
−
* Added Server Difficulty
 
−
* Removed Client Settings' 'Difficulty'
 
  
−
== Protocol Version ==
+
=== Data types ===
 +
 
 +
No changes documented so far.
 +
 
 +
=== Packets ===
  
 
{| class="wikitable"
 
{| class="wikitable"
−
! Version !! Protocol
+
! ID
−
|-
+
! Packet name
−
| 14w02a || 5
+
!colspan="2"| Documentation
 +
|-
 +
!colspan="4"| Configuration clientbound
 +
{{PacketList|0x0F|Clientbound Report Details (configuration)|rel=added}}
 +
{{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}}
 +
|-
 
|}
 
|}
  
−
== Play ==
+
== Handshake ==
 +
 
 +
No changes so far.
 +
 
 +
== Status ==
 +
 
 +
No changes so far.
 +
 
 +
== Login ==
 +
 
 +
No changes so far.
 +
 
 +
== Configuration ==
  
 
=== Clientbound ===
 
=== Clientbound ===
  
−
==== Chat Message ====  
+
==== 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.
  
−
Identifying the difference between Chat/System Message is important as it helps respect the user's chat visibility options. While position 2 accepts json formatting it will not display, old style formatting works
+
{| class="wikitable" {{added}}
−
+
! Packet ID
−
{| class="wikitable"
+
! State
−
! Packet ID !! Field Name !! Field Type !! Notes
+
! Bound To
−
|-
+
! colspan="2"| Field Name
−
| rowspan=2 | 0x02
+
! colspan="2"| Field Type
−
| JSON Data || String || https://gist.github.com/thinkofdeath/e882ce057ed83bac0a1c , Limited to 32767 bytes
+
! Notes
−
|-
+
|-
−
| Position || Byte || 0 - Chat (chat box) ,1 - System Message (chat box), 2 - Above action bar
+
| rowspan="3"| 0x0F
 +
| 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)
 +
|
 
|}
 
|}
−
{{Warning|Malformed JSON will disconnect the client}}
 
  
−
==== Player Position And Look ====  
+
==== Clientbound Server Links (configuration) ====
  
−
Updates the players position on the server.
+
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).
−
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 units will result in the client being kicked for "You moved too quickly :( (Hacking?)"
 
−
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"
 
  
−
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.
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="4"| 0x10
 +
| 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.
 +
|}
  
−
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
 
  
−
The yaw of player (in degrees), standing at point (x0,z0) and looking towards point (x,z) one can be calculated with:
+
{| class="wikitable" {{added}}
−
  l = x-x0
+
! ID
−
  w = z-z0
+
! Name
−
  c = sqrt( l*l + w+w )
+
! Notes
−
  alpha1 = -arcsin(l/c)/PI*180
+
|-
−
  alpha2 = arccos(w/c)/PI*180
+
| 0
−
  if alpha2 > 90 then
+
| Bug Report
−
    yaw = 180 - alpha1
+
| Displayed on connection error screen; included as a comment in the disconnection report.
−
  else
+
|-
−
    yaw = alpha1
+
| 1
 +
| Community Guidelines
 +
|
 +
|-
 +
| 2
 +
| Support
 +
|
 +
|-
 +
| 3
 +
| Status
 +
|
 +
|-
 +
| 4
 +
| Feedback
 +
|
 +
|-
 +
| 5
 +
| Community
 +
|
 +
|-
 +
| 6
 +
| Website
 +
|
 +
|-
 +
| 7
 +
| Forums
 +
|
 +
|-
 +
| 8
 +
| News
 +
|
 +
|-
 +
  | 9
 +
| Announcements
 +
|
 +
|-
 +
|}
 +
 
 +
=== Serverbound ===
  
−
You can get a unit vector from a given yaw/pitch via:
+
No changes so far.
−
  x = -cos(pitch) * sin(yaw)
 
−
  y = -sin(pitch)
 
−
  z =  cos(pitch) * cos(yaw)
 
  
−
About the flags field:
+
== Play ==
−
  <Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
 
  
−
{| class="wikitable"
+
=== Clientbound ===
−
! Packet ID !! Field Name !! Field Type !! Notes
 
−
|-
 
−
| rowspan=6| 0x08
 
−
| X || Double || Absolute/Relative position
 
−
|-
 
−
| Y || Double || Absolute/Relative position
 
−
|-
 
−
| Z || Double || Absolute/Relative position
 
−
|-
 
−
| Yaw || Float || Absolute/Relative rotation on the X Axis, in degrees
 
−
|-
 
−
| Pitch || Float || Absolute/Relative rotation on the Y Axis, in degrees
 
−
|-
 
−
| Flags || Byte ||
 
−
{| class="wikitable"
 
−
| X || 0x01
 
−
|-
 
−
| Y || 0x02
 
−
|-
 
−
| Z || 0x04
 
−
|-
 
−
| Y_ROT || 0x08
 
−
|-
 
−
| X_ROT || 0x10
 
−
|}
 
−
|}
 
  
−
==== Open Window ====
+
==== Clientbound Report Details (play) ====
  
−
This is sent to the client when it should open an inventory, such as a chest, workbench, or furnace. This message is not sent anywhere for clients opening their own inventory.
+
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 !! Field Name !! Field Type !! Notes
+
! Packet ID
−
|-
+
! State
−
| rowspan="6" | 0x2D
+
! Bound To
−
| Window id || Unsigned Byte || A unique id number for the window to be displayed. Notchian server implementation is a counter, starting at 1.
+
! colspan="2"| Field Name
−
|-
+
! colspan="2"| Field Type
−
| Inventory Type || String || The window type to use for display.  Check below
+
! Notes
−
|-
+
|-
−
| Window title || String || The title of the window.
+
| rowspan="3"| 0x7A
−
|-
+
| rowspan="3"| Configuration
−
| Number of Slots || Unsigned Byte || Number of slots in the window (excluding the number of slots in the player inventory).
+
| rowspan="3"| Client
−
|-
+
| colspan="2"| Details Count
−
| Use provided window title || Bool || If false, the client will look up a string like "window.minecart". If true, the client uses what the server provides.
+
  | colspan="2"| {{Type|VarInt}} (32)
−
|-
+
| The number of details in the following array.
−
| Entity ID || Int || EntityHorse's entityId. Only sent when window type is equal to "EntityHorse".
+
  |-
 +
| rowspan="2"| Details
 +
| Title
 +
| rowspan="2"| {{Type|Array}}
 +
| {{Type|String}} (128)
 +
|
 +
|-
 +
| Description
 +
| {{Type|String}} (4096)
 +
|
 
|}
 
|}
  
−
See [[Inventory#Windows|inventory windows]] for further information.
+
==== Clientbound Server Links (play) ====
  
−
==== Server Difficulty ====
+
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).
  
−
Changes the difficulty setting in the client's option menu
+
{| class="wikitable" {{added}}
−
{| class="wikitable"
+
! Packet ID
−
! Packet ID !! Field Name !! Field Type !! Notes
+
! State
−
|-
+
! Bound To
−
| rowspan="1" | 0x41
+
! colspan="2"| Field Name
−
| Difficulty || Unsigned Byte || 0:PEACEFUL, 1:EASY, 2:NORMAL, 3: HARD
+
! 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.
 
|}
 
|}
 +
 +
{| 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 ===
  
−
==== Client Settings ====
+
No changes so far.
−
 
 
−
Sent when the player connects, or when settings are changed.
 
−
 
 
−
{| class="wikitable"
 
−
! Packet ID !! Field Name !! Field Type !! Notes
 
−
|-
 
−
| rowspan="6" | 0x15
 
−
| Locale || String || en_GB
 
−
|-
 
−
| View distance || Byte || 0-3 for 'far', 'normal', 'short', 'tiny'.
 
−
|-
 
−
| Chat flags || Byte || Chat settings. See notes below.
 
−
|-
 
−
| Chat colours || Bool || "Colours" multiplayer setting
 
−
|-
 
−
| Show Cape || Bool || Client-side "show cape" option
 
−
|}
 
−
 
 
−
Chat flags has several values packed into one byte.
 
  
−
'''Chat Enabled:''' Bits 0-1. 00: Enabled.  01: Commands only.  10: Hidden.
+
[[Category:Minecraft Modern]]

Latest revision as of 10:40, 8 June 2024

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

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

Contents

Data types

No changes documented so far.

Packets

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

Handshake

No changes so far.

Status

No changes so far.

Login

No changes so far.

Configuration

Clientbound

Clientbound Report Details (configuration)

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

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

Clientbound Server Links (configuration)

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

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


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

Serverbound

No changes so far.

Play

Clientbound

Clientbound Report Details (play)

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

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

Clientbound Server Links (play)

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

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

Serverbound

No changes so far.

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