🤖 Agent: merged after integration wave 1 on the desktop (main e730dc14 + #1108#1114#1131#1157#1158#1162 = ae482a72): fmt, clippy -D warnings, workspace tests (one port-race flake in horizon-server panel, passes on rerun), release build, tools/parity.py --changed origin/main 299/302 then the 3 rerun: save_roundtrip pass, world_reopen pass x2 (one early-count flake), dedicated_server = known flake also failing on main (fixed by #1183/#1184).
🤖 Agent: merged after integration wave 1 on the desktop (main e730dc14 + #1108#1114#1131#1157#1158#1162 = ae482a72): fmt, clippy -D warnings, workspace tests (one port-race flake in horizon-server panel, passes on rerun), release build, tools/parity.py --changed origin/main 299/302 then the 3 rerun: save_roundtrip pass, world_reopen pass x2 (one early-count flake), dedicated_server = known flake also failing on main (fixed by #1183/#1184).
🤖 Agent: merged after integration wave 1 on the desktop (main e730dc14 + #1108#1114#1131#1157#1158#1162 = ae482a72): fmt, clippy -D warnings, workspace tests (one port-race flake in horizon-server panel, passes on rerun), release build, tools/parity.py --changed origin/main 299/302 then the 3 rerun: save_roundtrip pass, world_reopen pass x2 (one early-count flake), dedicated_server = known flake also failing on main (fixed by #1183/#1184).
🤖 Agent: merged after integration wave 1 on the desktop (main e730dc14 + #1108#1114#1131#1157#1158#1162 = ae482a72): fmt, clippy -D warnings, workspace tests (one port-race flake in horizon-server panel, passes on rerun), release build, tools/parity.py --changed origin/main 299/302 then the 3 rerun: save_roundtrip pass, world_reopen pass x2 (one early-count flake), dedicated_server = known flake also failing on main (fixed by #1183/#1184).
🤖 Agent: merged after integration wave 1 on the desktop (main e730dc14 + #1108#1114#1131#1157#1158#1162 = ae482a72): fmt, clippy -D warnings, workspace tests (one port-race flake in horizon-server panel, passes on rerun), release build, tools/parity.py --changed origin/main 299/302 then the 3 rerun: save_roundtrip pass, world_reopen pass x2 (one early-count flake), dedicated_server = known flake also failing on main (fixed by #1183/#1184).
🤖 Agent: merged after integration wave 1 on the desktop (main e730dc14 + #1108#1114#1131#1157#1158#1162 = ae482a72): fmt, clippy -D warnings, workspace tests (one port-race flake in horizon-server panel, passes on rerun), release build, tools/parity.py --changed origin/main 299/302 then the 3 rerun: save_roundtrip pass, world_reopen pass x2 (one early-count flake), dedicated_server = known flake also failing on main (fixed by #1183/#1184).
Pack-wide numbers after the modpacks-12 PRs (#1175, #1176, #1177, #1191):
structures that start, processors carried and dropped per mod, content,
load time and the play-through, and the gaps ranked by how much a player
notices them.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The last two workstation menus guests couldn't use, both now on the
shared menu engine, which single player runs too:
- Lectern: LecternMenu on the engine (Kind::Lectern): the page buttons
(1, 2, 100+) and Take Book (3, mayBuild) as ContainerButtonClick, the
page as data slot 0 clamped to the book, the book in its one slot
(removeItem, setItem a no-op, max 1). The host opens minecraft:lectern
for a guest, applies the menu to the block entity (powered pulse, page
turn level event 1043, has_book), resends changes and closes it on
stillValid. Guests drive it from the book screen.
- Cartography table: CartographyTableMenu on the engine (Kind::Cartography,
setupResultSlot, onTake, onCraftedBy's new map ids through a Maps env),
replacing the old station code; guests get the same through
guest_menu_op.
- LAN item stacks carry map_post_processing and writable/written book
contents (they were blank for guests); map_post_processing is no longer
saved (ItemStack.CODEC never saves it).
- A guest who enchants gets the enchant_item stat.
- Click parity: VanillaMenuOracle and menu_fixture gain both menus.
- lan_e2e: new lectern and cartography checks; enchanting checks the
stat; server_count/server_reply ignore the guest's own operator
broadcast echo on --server-thread; the grindstone check counts levels
as well as points.
Fixes#868
Co-Authored-By: Claude Opus 5.5 <[email protected]>
On Linux an unprivileged thread can't raise itself, so #1179's render
thread hint does nothing there. The dedicated server already lowered its
helper threads instead (world generation, lighting, connection writers:
10 nice levels, or the idle class). The client now does the same, so the
world-generation and meshing workers (two pools with single player's
server thread) no longer hold the render thread back while terrain loads.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Trees of neighbouring chunks overlap on chunk corners, and the one
decorated first wins. With several worker threads vanilla decorates in a
different order each run: seed -2080727421395798566 spawned at Y 64, 66
or 72 over 10 runs. The harness retried vanilla up to 3 times and passed
if any run matched, which still failed when none of them gave 72.
With -Dmax.bg.threads=1 (Util.maxAllowedExecutorThreads) vanilla
decorates in its scheduler's order, the one Horizon follows: that seed
gave 72 in 10 of 10 runs, as Horizon does. The other seeds that varied
are fixed too (10 of 10 each: -8171837717659076940 at 0 67 0,
-5296387317982839690 at -16 73 16, -211473008665507967 at 0 66 112).
The retries go, and vanilla's one spawn is compared exactly.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Three races made the two sides differ with nothing wrong in Horizon:
- Steps ended on a fixed 1.5 s sleep. On a slow run a chat or its
broadcast (vanilla queues the chat, then the broadcast as a later
task) landed in the next step. Each step now also ends on a barrier:
every connected client sends `random value 1..2` twice, and waits for
the answer, which only the sender gets and which is left out of the
transcript.
- The client closed every socket at once, and the server logs
"<name> lost connection" in whatever order its network threads see
the closed connections. The players still connected now leave one at
a time: each waits until it has been told the previous one left
(PlayerList.remove broadcasts that after logging). The harness waits
for Carol's line before stopping the server.
- A player the server kicks (Bob, Mallory) is logged as
"lost connection: <reason>", or as "Disconnected" when vanilla's
network thread closes the connection before disconnect(reason) runs.
The reason sent is still compared in the transcript, so the log line
no longer compares it for kicked players.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Natural spawning was a quarter of a 40-player server thread. Every spawn
attempt cloned the position's whole spawn list (NaturalSpawner.mobsAt) to
check the picked entry is still in it, and every group cloned it again to
pick from; mobs_at now returns the biome's or the structure's list as it is
stored (the fortress list lives in a static). The nearest player's distance,
asked on every attempt, is now the minimum of the distances instead of a
search that kept the player too. Same lists, same draws, same distances.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Single player on the server thread publishes inside the integrated
server, so self.lan alone missed it; and the fps block runs only when a
frame is drawn.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The vanilla protocol client moved on after a fixed time per step. On a
busy machine, either side's server could be slower than that: the
summoned villager was not seen yet when the trade step ran, the furnace
had not smelted the ingot when it was taken, a snowball was not thrown
yet, or the pearl had not landed. Each mode failed now and then on one
side only.
Those steps now keep the same minimum time and then also wait, for up to
30 s, until it happened: the villager is tracked, the furnace's result
slot has the ingot (plus 1 s), the snowball entity was added (plus 1 s),
the pearl teleport and the health update arrived. The respawn line also
leaves out block updates: a lava fall keeps flowing while the game runs,
and how many updates arrive before the respawn depends on timing.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The client asks for its render thread what it already asks for the
server thread (vanilla's MinecraftServer.spin): user-interactive QoS on
macOS, above-normal priority on Windows, on machines with more than four
processors. While terrain loads at 32 chunks, the worker pools (two with
single player's server thread), the chunk encoders and other programs
outnumber the cores. A frame that gave its core up in queue.submit then
waited 10 to 200 ms to get one back: the long frames of #678.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
tick_lan described every tracked entity afresh each tick: a new String for
its type, new vectors for its entity data, equipment and attributes, all
freed again at the end of the tick. The states now live in the LAN host
between ticks and each tick writes over the last tick's in place
(lan::entity::States), so those allocations are kept. The states, and so
every packet built from them, are the same as before.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The game sends an anonymous ping once a minute while it runs (a random
session ID kept only in memory, the version, the platform, whether a LAN
or friends world is open). The telemetry server counts sessions seen in
the last 2 minutes, in memory only, with its own per-address rate limit
and a session cap, and serves rounded counts at GET /v1/live. The
launcher shows "N playing now" on the Play page when the count is
reachable, and tells players what the ping holds on the first-run
question, in Settings, and once on the Play page for players who
answered before. docs/telemetry.md and the privacy page say the same.
Like the rest of telemetry, nothing is sent until HORIZON_TELEMETRY_URL
is set or DEFAULT_ENDPOINT gets a server.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Three races made the comparison of the servers' lines about the player
fail at random:
- a login's lost connection is logged at the server's next tick, and the
next login could start before it: each login now ends once the server
logged its lost connection;
- vanilla's authenticator disconnects a player, then logs why, while the
server thread may already log the lost connection: each login's lines
are compared thread by thread;
- a player the server kicks closes the connection once it reads why; when
that comes first vanilla logs the lost connection as "Disconnected"
(seen once in 12 desktop runs), so a login's kick reason stands for both.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ThrownEnderpearl.onHit teleports the owner to oldPosition() (where the
pearl started its last tick) with ServerPlayer.teleport, which sends the
position packet whatever the distance. A guest's turn sent a teleport only
when the player moved more than 0.01 blocks, and the pearl took the hit
point: a pearl thrown at one's feet often lands within that, and the
dedicated_server harness saw "teleported 0 time(s)" where vanilla's server
sends 1 (about one run in four on the desktop).
The pearl now moves the player to its previous position and marks the
teleport (PlayerMotion.teleported), which the end of the guest's turn
sends even when the player stays put.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A client of a server (single player's server thread, LAN, multiplayer)
handled every received packet in the frame it arrived. Crossing a chunk
border at 32 chunks brings 25 to 60 columns at once, 0.1 ms each to
decode on an M4 Pro: a 3 to 8 ms frame each time. Once a frame has spent
1 ms on chunk packets, the events from the next chunk packet on wait for
the next frame, in order; events that have waited a tick are all handled
at once, so a slow machine's backlog never holds packets longer than
that. The status's pending_chunks counts the waiting events.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Formations' PiecedStructure starts like its SimpleStructure, then lays out
the element's jigsaw children with vanilla's jigsaw. The game's jigsaw
assembler now exposes its child layout (add_children) for a start piece
placed by another structure type; horizon:formations reads horizon:pieced
(max_depth, max_distance_from_center), which carry writes for
formations:pieced.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ctov:modular_compat runs another processor list only when the mod it names
is loaded: carry writes that list in when the mod is ported along and takes
the hook out otherwise (142 copies in ATM10, all for Nature's Spirit).
Repurposed Structures' mineshaft_sky_view_processor (71 lists) becomes the
game's horizon:mineshaft_sky_view: nothing at or above the world's
OCEAN_FLOOR_WG height, except plain rails over a block that can occlude,
waterlogged where the world holds water. Placement contexts gain
can_occlude.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A guest's use of a crafter now opens CrafterMenu (minecraft:crafter_3x3)
over the block entity. The host runs its clicks on the menu engine's
verified Kind::CrafterBlock (a disabled slot refuses items, filling one
enables it), sends the disabled slots and triggered as data slots
(CrafterBlockEntity.containerData), and handles
ServerboundContainerSlotStateChangedPacket (new in horizon-protocol) as
CrafterBlockEntity.setSlotState. The guest shows the server's crafter,
predicts its clicks and sends a slot toggle before the click as
CrafterScreen.slotClicked does.
Part of #868.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
BeaconMenu now runs on horizon_client::menu (Kind::Beacon): the payment
slot (beacon_payment_items, one item), quickMoveStack and updateEffects
with BeaconBlockEntity.validateEffects, verified against the vanilla class
by test_menu_click_parity with a new SET_BEACON op (valid and invalid
powers for each pyramid level).
ServerboundSetBeaconPacket is now in the protocol. The LAN host opens
minecraft:beacon for guests with the block entity's levels and powers as
data slots (kept current while the menu is open), applies a guest's
powers to the block entity (power_select while the beam is up) and drops
the payment when the menu closes, as BeaconMenu.removed does. Guests show
the server's levels and powers and their Done button sends the packet.
Single player's beacon clicks go through the engine too.
Part of #868.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
EnchantmentMenu now runs on horizon_client::menu: the item slot (one
item) and the lapis slot, its quickMoveStack, slotsChanged clearing the
offers without an enchantable item, and clickMenuButton's checks against
the costs, lapis and levels, verified against the vanilla class by
test_menu_click_parity (with its ten data slots and the offer buttons;
the oracle's player now has a profile for the invalid-button log line).
The offers and the enchanting itself, which need a level, stay with the
caller.
Single player routes the table's clicks, drags and double clicks through
the engine. The LAN host opens minecraft:enchantment for guests with
their own enchantment seed (saved with their player data), sends the
costs, seed and clues as data slots, and on ContainerButtonClick
enchants the item, takes the guest's level and lapis and gives a new
seed. Guests show the server's offers and send the button the client
menu accepts.
Part of #868.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
AnvilMenu and SmithingMenu (ItemCombinerMenu) now run on
horizon_client::menu: their slot rules, createResult (the anvil's cost
data slot, repair count and rename, the smithing table's hasRecipeError),
mayPickup with the player's levels, the results' onTake and
quickMoveStack, verified against the vanilla classes by
test_menu_click_parity with repairs, merges, renames (a new RENAME op,
AnvilMenu.setItemName) and the player's levels. The harness found the
anvil treating only enchanted books as books (vanilla: anything with
stored enchantments), now fixed, and the grindstone's and anvil's result
slots now count for a double click's pick-all as in vanilla.
Single player routes both screens' clicks, drags and double clicks
through the engine; the anvil's wear and level events 1030/1029, and the
smithing table's 1044, play with vanilla's random pitch.
The LAN host opens minecraft:anvil and minecraft:smithing for guests,
handles ServerboundRenameItemPacket (new in horizon-protocol), charges the
guest's levels and wears the anvil; guests send the rename box as
AnvilScreen.onNameChanged does and show the server's cost. The control
socket's `type` now reaches the anvil's rename box.
Part of #868.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
GrindstoneMenu now runs on horizon_client::menu (Kind::Grindstone): its
input filter, computeResult, the result's onTake (both inputs cleared,
the experience sum handed to the caller) and quickMoveStack, verified
against the vanilla class by test_menu_click_parity with enchanted,
damaged and cursed tools and books.
Single player routes the grindstone's clicks, drags and double clicks
through the engine and rolls the orbs and level event 1042 (now playing
block.grindstone.use) where the result is taken. The LAN host opens
minecraft:grindstone for guests on the same engine and awards the orbs at
the block; guests read enchantments, stored enchantments, repair cost and
custom names from the server's stacks, and the host now sends repair
cost.
Part of #868.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
StonecutterMenu joins horizon_client::menu (Kind::Stonecutter): the input's
recipe list (slotsChanged / setupRecipeList), selectedRecipeIndex as its data
slot, clickMenuButton (an invalid index is taken too), the result's onTake
(one input used up, awardUsedRecipes, the take sound) and quickMoveStack with
the leftover of a result move dropped. test_menu_click_parity compares it
with vanilla's StonecutterMenu, recipe buttons included.
Single player's stonecutter screen now clicks through the engine (drags and
double clicks included), and its recipe grid calls clickMenuButton as
StonecutterScreen does. A LAN guest's stonecutter opens minecraft:stonecutter
on the host's engine, as the loom does (#868).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A guest's use of a loom opens LoomMenu (minecraft:loom) for the guest. The
host runs the guest's menu on the shared menu engine (horizon_client::menu,
Kind::Loom, as single player does): clicks, the pattern buttons
(ServerboundContainerButtonClickPacket), the content and data slot sync after
each, the take-result sound at the loom, stillValid (the block gone or out of
reach) and clearContainer when it closes or the guest leaves. The guest opens
the loom screen for the server's menu, predicts its clicks and buttons on the
engine and sends them, runs the menu's client-side slotsChanged on the
server's slots and reads the selected pattern from the data slot.
The framework (game/lan_stations.rs, game/remote_stations.rs) takes the other
workstations one by one (#868).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Carry maps mostructures:generic to vanilla's jigsaw with horizon:start_checks
(terrain_radius 2, terrain_range = heightRange) and mostructures:type to a
random spread with the config's default spacing and separation and its sets
to avoid as horizon:exclusion_zone. The game's exclusion zone gains
"their_zones": false, which tests the avoided sets by spread and frequency
alone, as ModStructurePlacement does.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
#1007's white overlay on Hyprland is #1075's washed-out swapchain: a
Wayland compositor with colour management makes Mesa list Rgba16Float
first, and the first non-sRGB format was taken. Reproduced on a real
GPU (Mesa 26.2 ANV, Intel HD 620) under headless weston 16: the old
choice washes the frame out, main's Bgra8Unorm doesn't. This test keeps
that list, as wgpu reports it, choosing an 8-bit format.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A version prepared while the sound copy failed (Mojang's republished 26.3
asset index, #1076, fixed in #1091), or one that reused such a version's
resources when installed, stays silent and showed as plain Prepared. The
Play page now says it is prepared without its sounds and makes Prepare
again the visible fix; versions --installed and the MCP list say so too.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
release.yml and launcher.yml build x86_64-apple-darwin on the Mac mini's
runner beside Apple Silicon: horizon-macos-x64.zip, and the launcher's
horizon-launcher-macos-x64.zip and .dmg, signed and published with the
rest, on the same unsigned path as arm64. Their checks and smoke tests run
the x86_64 programs under Rosetta 2. A launcher picks its assets from one
table (PLATFORMS) by OS and processor, and a test checks the workflows
publish every asset in it. package.sh names the assets per architecture
and refuses a binary built for the other one. The server installer, the
website's Download button (Chromium tells Intel Macs apart; other browsers
get an Intel Mac link) and the docs know the Intel build.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The client asks for its render thread what it already asks for the
server thread (vanilla's MinecraftServer.spin): user-interactive QoS on
macOS, above-normal priority on Windows, on machines with more than four
processors. While terrain loads at 32 chunks, the worker pools (two with
single player's server thread), the chunk encoders and other programs
outnumber the cores. A frame that gave its core up in queue.submit then
waited 10 to 200 ms to get one back: the long frames of #678.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
HORIZON_SPIKES spans keep the thread's CPU time beside their wall time,
and the slow-frame line gives the render thread's CPU time in the frame.
A span that mostly waited (for the GPU, a lock or a core) prints both
(`submit 30.2/0.1`), so a frame that waited reads apart from one that
worked. Found the cause of #678's long frames: the render thread losing
its core in queue.submit.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Releasing a Riptide trident now starts LivingEntity.startAutoSpinAttack(20,
8.0): for 20 ticks the player takes the SPIN_ATTACK pose (0.6x0.6, eye
height 0.4), hits the first living entity its swept box touches for the
spin's damage and bounces back (velocity x -0.2), and stops on a horizontal
collision. The player model spins (setupRotations: rotX(-90 - xRot),
rotY(age * -75)), SpinAttackEffectLayer draws the riptide boxes, and the
first-person hand uses ItemInHandRenderer's spin transform. LAN guests see
the host's spin through living flag bit 4.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
#1113 (moving pistons) and #1115 (break particles, which gave particle_sprite
a position for its biome tint) each passed alone; together main no longer
compiled. A moving block now takes its tint at its own block position, as
vanilla's moving-block renderer reads the level's tint there.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Verify and CI parity pass (the earlier online_mode failure was a race and passed on rerun). Moving blocks are drawn and solid; entity pushing is in FEATURES.md LATER 4h.
🤖 Agent: merged. Verify passes. Proof: the B5 integration of these eight heads (parity --changed 102/102, lan_e2e 46–47/48 with only order-dependent flakes), and the conflict resolution in tools/lan_e2e.py checked def by def against each branch.
🤖 Agent: merged. Verify passes; local parity --changed origin/main passes (101 harnesses; #1159's one online_mode diff reran clean and passes on main). Screenshots and tick-by-tick results in the body.
🤖 Agent: merged. Verify passes; local parity --changed origin/main passes (101 harnesses; #1159's one online_mode diff reran clean and passes on main). Screenshots and tick-by-tick results in the body.
A new Horizon Extras option, Lighting > Dynamic lights (`dynamicLights`,
off by default): a torch, lantern or other light-emitting item held by a
player or mob, dropped as an item, or any entity on fire lights the blocks,
entities and hand around it, as LambDynamicLights and OptiFine do.
Client-only and at render time: the light engine, chunk meshes and saves
never see it. Each frame the game picks the 16 sources nearest the camera
(dynamic_light::select) and passes them in Globals; terrain.wgsl and
entity.wgsl raise each vertex's block light to `level - distance` when that
is brighter. Off, the count in globals.time.z is 0, nothing is gathered and
the shaders' loop runs zero times, so no pipeline is rebuilt either way.
An item glows like its block's default state (torch 14, lantern and
glowstone 15, lit redstone torch 7); a lava bucket 15; burning entities 15.
Fixes#814
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The guest came home into its Nether portal's frame, with an obsidian
ceiling three blocks up, and the host onto the End portal it had set at
spawn; both stayed there for the rest of the run. Under that ceiling a
double jump rises about 1.2 blocks at most, and whether the flight check
saw it depended on timing: `flight` failed in full --server-thread runs
(portals runs only there) and passed alone. The check now clears the
frame and the End portal in the overworld, and puts the guest back where
it started, also when it fails.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
On single player's server thread the broken log's drop and its pickup
both come from the server, a few ticks after `break` answers: the
pickup could land before the scenario looked for the drop, which it
then never found (StopIteration). Step 3 now waits up to 20 ticks for
the logs in the inventory or the drop to walk to.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Step 2 clones a stack in the creative tab and closes the screen. The
clone lived only on the client: ItemPickerMenu's carried stack is the
inventoryMenu's, and AbstractContainerMenu.removed clears the carried
stack only for a ServerPlayer, so vanilla's client still holds it when
the survival inventory opens. With a stack in hand the middle button's
release sends CLONE (AbstractContainerScreen.mouseReleased); the server
finds the carried stack it was told about wrong and sends the empty one
(broadcastChanges). On single player's server thread that answer takes
a round trip, as in vanilla, so step 3 now waits up to 20 ticks for it.
The in-frame world puts the clone away when the menu closes.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
From b9f3821f (fix/server-thread-default): the host window draws what
it was sent on the server thread, and agent_control_e2e waits two ticks
where the server answers a click.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
On a client of a server (single player's server thread, a LAN guest) the
placed block comes with the server's answer: `place` waits up to a second
for it before reporting no change. agent_control_e2e tries the next free
spot when the tree's trunk above the broken log hides a spot's faces.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit 9821bb7ef5)
- The command harness (HORIZON_COMMAND_SCRIPT) drives the world itself,
without the event loop, so it does not start the server thread.
- `status` lists the minecarts a client of a server was sent.
- save_roundtrip: single player's server thread finishes the chunks its
player tracks, as vanilla's integrated server does, including some that
vanilla's server (view distance 4) left before their terrain or light.
Those had no blocks, light or heightmaps to compare yet.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit 2818c89f24)
Single player's world now runs on the integrated server thread unless
asked otherwise, as vanilla's does, so a world tick no longer holds up
a frame. `--no-server-thread` or `HORIZON_SERVER_THREAD=0` keeps the
world in the frame as an escape hatch; `--server-thread` stays.
lan_e2e.py sets the host's mode explicitly either way.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit 4ff23b686d)
🤖 Agent: merged. Verify passes; CI parity's only failure is the known dedicated_server pearl flake. Measured panning against OpenAL Soft's stereo output in the body.
🤖 Agent: merged. Verify passes. CI parity's only failure is server_player_targets, a server harness this client rendering change can't touch; it has flaked before (its log said '109 lines identical' on #1118). Screenshots in the body.
🤖 Agent: merged. Verify and CI parity pass. Mod browser part 1/3: Modrinth source and checksum verification. The CurseForge source stays inactive until a key is configured.
A player who joined already in creative could not fly: the remote
client kept only instabuild and the flying speed of
ClientboundPlayerAbilitiesPacket, and the motion step clears flying for
a player that may not fly. The packet also comes before the client has
a player (it is made at the first teleport). Single player creative on
its server thread could not fly at all; a LAN guest only after a game
mode change.
- The remote client keeps the last abilities and applies flying, may
fly, invulnerable and the flying speed to the player, also when the
player is made (ClientPacketListener.handlePlayerAbilities).
- When its flight turns on or off (double jump, spectator, landing) it
sends ServerboundPlayerAbilitiesPacket (LocalPlayer.onUpdateAbilities).
- The hub keeps it as the guest's flying when the guest may fly
(handlePlayerAbilities), so the save has it, and a game mode change
sets it as GameType.updatePlayerAbilities does.
- lan_e2e `flight`: the guest, and on the server thread the host's
window, fly in creative, stay up, and stop in survival.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Vanilla plays a block use's sound with `level.playSound(player, ...)`: the
player who clicked hears it from their own client's use, and the server
sends it to everyone else. Horizon's guest waited for the server's sound,
one round trip after its predicted door had already opened.
The guest now plays the sounds of the use it predicts (doors, trapdoors,
fence gates, levers, buttons), and the server sends the sounds of such a
use to the other players only. The control socket's `status` counts the
positional sounds each game played (`heard`).
lan_e2e `predict`: with the host frozen, the guest already hears its door;
once the server answers, the guest and the host have each heard it once.
Fixes#869
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A client of a server sent the bow's use but never started using the item
itself, so letting go of the button sent no RELEASE_USE_ITEM: the server
kept the guest drawing and never shot. BowItem.use runs on the client too
(startUsingItem, with an arrow or in creative), and Minecraft.handleKeybinds
releases the item in use once the button is up.
The guest now draws on its own side as well (held until the button lets go
or another slot is picked), so the server shoots when it lets go.
lan_e2e: `arrows` passes both ways now (the guest's arrow hurts the host);
the `pvp` and `arrows` checks allow the victim natural regeneration while
pvp is off (it healed 19.3 -> 20 and failed the exact check).
Fixes#484
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Vanilla's MultiPlayerGameMode.useItemOn runs the use on the client's own
level inside startPrediction, records each block it changes under the
packet's sequence in BlockStatePredictionHandler, and keeps them until
ClientboundBlockChangedAckPacket settles them (a use the server refused
goes back). A Horizon guest only sent the use: its door opened one round
trip later.
The guest already ran the use on a dry copy of its level to know whether
the click ends there; the blocks that use changes are now kept on its
level as predictions under the use's sequence, as the break prediction
does, when they are all hand-operated blocks: a wooden or copper door,
trapdoor or fence gate, a lever or a button (an iron door has no hand use
and changes nothing). The sound still comes from the server.
lan_e2e `predict`: with the host process frozen, the oak door the guest
clicks is already open on the guest's side (both halves), stays open on
both sides once the server answers, and an iron door stays shut.
Fixes#869
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A remote player's projectiles never hit other players: a player's shots
only looked for mobs and the host, a guest's flew as if the host had shot
it (so it could not hit the host until it left the host's box), and a hit
on a guest from another guest ran as the shooter, who has no hub to reach
the victim. No bow PvP on a server or between LAN players.
A player's arrows, snowballs and eggs now meet every player, a guest's
flying from that guest (Projectile.getOwner). A hit on another player runs
as the victim's hurt, refused when the pvp game rule is off or the teams
are allies without friendly fire (ServerPlayer.canHarmPlayer), which turns
the arrow back as a raised shield does (AbstractArrow.onHitEntity).
Pearls, potions and wind charges fly past players as before.
lan_e2e `arrows`: the guest shoots the host and the host the guest with a
bow, both hurt; with pvp off, no harm.
Part of #484
Co-Authored-By: Claude Opus 5.5 <[email protected]>
LivingEntity.die credits the kill to lastHurtByPlayer: the killed
statistic, the mob_kills custom statistic, the kill score criteria and the
player_killed_entity trigger belong to that player. Horizon kept only
whether a player had hurt the mob, and the death ran as the host, so a LAN
or server guest's kills counted in the host's statistics and advancements.
The mobs a player hurt now remember which player (the acting guest's
connection, or the host), and the killer's side of the death runs as that
guest.
lan_e2e `kills`: a pig the guest kills shows in the guest's
minecraft.killed:minecraft.pig score, not the host's.
Part of #484
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The hub's players are server players too, and in vanilla the armour they
wear counts against every hit (LivingEntity.collectEquipmentChanges puts
each piece's attribute modifiers on the player, getDamageAfterArmorAbsorb
reads them). Horizon only put them on the host: a guest who put armour on
in its inventory menu (the hub moves it), joined wearing it, respawned with
it kept or came through a portal (a new body each time) was hurt as if it
wore nothing. Iron armour, 15 points, should take a 10-damage blow down to
6; a guest took the full 10.
Each guest now keeps its own list of applied equipment modifiers, swapped
in with the rest of its state for its turn, and its armour and main hand
are put on its attributes whenever they differ from what they were put on
for (a new body starts with none).
lan_e2e `worn`: the guest shift-clicks iron armour on in its inventory and
takes 10 mob-attack damage: 6 with it, 10 without (failed before: 10 and 10).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit e0549f88ce)
ServerExplosion.hurtEntities takes every entity in range, players
included, but only the host player was hurt and pushed: LAN guests stood
in a blast untouched. The player's part is now its own function, run for
the host and then for each guest in the level, swapped in as the player.
It also follows Player.hurtServer more closely for everyone: the damage
goes through a raised shield (an explosion is blocked like any attack
from where the blast is, the shield takes wear), the push is reduced by
explosion knockback resistance, and a spectator or a creative player
flying is not pushed.
tools/lan_e2e.py gains a `blast` check: primed TNT five blocks from a
survival guest hurts it (20 -> 4.6) and pushes it away; facing it behind
a raised shield, the guest takes nothing. Before this change the guest
took no damage and no push.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit 0782a598fe)
PiglinAi.throwItemsTowardPlayer aims at NEAREST_VISIBLE_PLAYER: the
nearest living, non-spectator player within 16 blocks. Only the host was
considered, so a LAN guest who bartered saw the loot fly to the host.
lan_e2e's new barter check: the guest, in gold boots, drops a gold ingot
to a piglin in a glass corridor with the host on the far side; the
piglin stays calm and the barter reaches the guest. It fails on the old
build (the loot lands on the host's side).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit 896f12f732)
Player.attack on a #minecraft:redirectable_projectile (a ghast's fireball,
a wind charge) deflects it with ProjectileDeflection.AIM_DEFLECT: its
movement becomes the attacker's unit view vector and the attacker its
owner, with the no-damage sound. The crosshair finds these projectiles a
block round their box (AbstractHurtingProjectile.getPickRadius), a remote
client sends the attack for them, and the host turns one a guest strikes
along that guest's view. A fireball a player turned back kills the ghast
it hits (Ghast.isReflectedFireball: no fire immunity, 1000 damage).
lan_e2e.py --check deflect: the host strikes a caged ghast's fireball and
the ghast dies; before, the fireball hit the host.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit 6ba02f5205)
SmallFireball.onHitBlock places fire with Level.setBlockAndUpdate and
BaseFireBlock.getState (soul fire on soul soil and soul sand), and a mob's
fireball only when mobGriefing is on. Horizon wrote a plain fire state
straight into the chunk: no block updates and no scheduled fire tick, so
the fire never aged and never went out, even on stone or nether bricks
where vanilla's goes out within about half a minute (FireBlock.tick). Every
blaze fireball that missed left a fire that stayed for good: fortress
floors round a spawner filled with fire that kept everyone near it burning.
The fire is now the level's fire state for the spot, set with updates
(the fire's tick is scheduled on place), and only with mobGriefing when a
mob shot it.
lan_e2e `fireball`: a dispenser shoots a fire charge onto stone; both
players see the fire and it goes out by itself (failed before: still burning
after 1200 ticks; now out after about 480).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit 5b7235c24b)
🤖 Agent: merged. Verify passes. B5's local integration of all its PRs on main: parity --changed 102/102, plus lan_e2e (flakes listed in FEATURES.md LATER 4l).
🤖 Agent: merged. Verify passes. B5's local integration of all its PRs on main: parity --changed 102/102, plus lan_e2e (flakes listed in FEATURES.md LATER 4l).
🤖 Agent: merged. Verify passes. B5's local integration of all its PRs on main: parity --changed 102/102, plus lan_e2e (flakes listed in FEATURES.md LATER 4l).
🤖 Agent: merged. Verify passes. B5's local integration of all its PRs on main: parity --changed 102/102, plus lan_e2e (flakes listed in FEATURES.md LATER 4l).
🤖 Agent: merged. Verify passes. B5's local integration of all its PRs on main: parity --changed 102/102, plus lan_e2e (flakes listed in FEATURES.md LATER 4l).
🤖 Agent: merged. Verify passes. B5's local integration of all its PRs on main: parity --changed 102/102, plus lan_e2e (flakes listed in FEATURES.md LATER 4l).
🤖 Agent: merged. Verify passes. B5's local integration of all its PRs on main: parity --changed 102/102, plus lan_e2e (flakes listed in FEATURES.md LATER 4l).
🤖 Agent: merged. Verify passes. B5's local integration of all its PRs on main: parity --changed 102/102, plus lan_e2e (flakes listed in FEATURES.md LATER 4l).
The Shader Pack setting cycled through what shaderpacks/ held, so with the
folder empty (or the packs in the launcher's version folder, as brabus_ had
them) it silently stayed Off. The row now opens a Shader Packs page: a
sidebar section in the Horizon menus, Video Settings > Shader Packs... in
the Classic ones. It shows the game home's shaderpacks/ path and an Open
Folder button (made if missing), says when there is no pack, and lists one
switch per pack. A pack that fails to load says why on its row. The list is
read again every second while the page shows.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
GL fills the channels a fragment shader leaves out; wgpu refuses a pipeline
whose output has fewer channels than its target. Steadfast's final pass
writes `out vec3` and failed to build in the game.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Preprocessor (GLSL and shaders.properties), as JCPP does:
- a #define replaces an earlier macro (Bloop, Steadfast: DefineRedefined);
- in #if, a float counts as its integer part (Steadfast's
shaders.properties float token), and a macro always defined empty counts
as 0 (Iris's MC_GL_VENDOR_OTHER, Bloop's TAA_USE_YCOCG);
- an #if may run to the end of the input (Bloop's taa.fsh);
- #error "..." lexes in skipped blocks (Photon);
- shaders.properties keeps its empty lines and hides backslashes from the
preprocessor (IRIS_PASSTHROUGHBACKSLASH), so a continued value no longer
swallows the next directive or line (Photon, Bliss, Steadfast's custom
uniforms; Complementary's isCold uniform is now complete).
Legaliser: % through overloads (naga won't take ivec2 % int: Noble),
sqrt of a negative constant left to the GPU (Bloop's NaN), constants naga
can't fold (?:, mix: Bliss) become globals set in main, and 16/8-bit types
(u16vec2 & co., Noble on NVIDIA) become their 32-bit ones.
horizon-client: real_packs_load runs the game's own load over the packs in
HORIZON_TEST_SHADERPACKS (the compatibility table's source).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A Mods page between Versions and Modpacks: resource packs, shader packs and
modpacks as tabs, a search field, Show everything, and Modrinth / CurseForge
once CurseForge has a key. Results are index rows with summary, author,
downloads, source, licence and how well each runs (with the reason), Page and
Install (Import for a modpack, which then shows on the Modpacks page).
Installed packs list their version, source, file and the checksum they were
checked against, with Update and Remove. Searches, installs and update checks
run on threads; stale search answers are dropped.
Fixes#577
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Verify passes. B5's local integration of all its PRs on main: parity --changed 102/102 (the explosion-dependent 22 rerun after rebasing onto #1101), and lan_e2e passes except checks that fail only after earlier checks and pass alone (in FEATURES.md LATER 4l).
🤖 Agent: merged. Verify passes. B5's local integration of all its PRs on main: parity --changed 102/102 (the explosion-dependent 22 rerun after rebasing onto #1101), and lan_e2e passes except checks that fail only after earlier checks and pass alone (in FEATURES.md LATER 4l).
browser::installed installs a pack and its required dependencies into
resourcepacks/ or shaderpacks/, every file checked before any download
(a dependency that is a Java mod stops it) and checksum-verified on the
way in; mod-browser.json records source, version, file and checksum.
Update swaps the file, remove deletes only what the browser installed (a
player's own file of the same name is never overwritten). A modpack is
downloaded, checked, and imported through the Modpacks page's pipeline.
The CLI gains `mods list|search|install|update|remove`.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The launcher's core gains `browser`: search Modrinth for what Horizon loads
(resource packs, Iris/OptiFine shader packs, modpacks; never Java mod jars),
say how well each result runs, pick the newest version that runs, and
download a file only from Modrinth's or CurseForge's file servers, with a
plain file name, kept only when its size and SHA-512 (SHA-1 on CurseForge)
match. CurseForge is a pluggable source that stays off until an API key
exists (HORIZON_CURSEFORGE_API_KEY at run time or build time; the launcher
workflow passes the repository secret). docs/mod-browser.md.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Three differences from vanilla's Axolotl kept the brain from matching:
- The constructor's setPathfindingMalus(WATER, 0) was missing, so every
swim target in water failed DefaultRandomPos's malus check and idle
axolotls never picked a walk target.
- Axolotl.getWalkTargetValue returns 0 everywhere; Horizon used Animal's
light-based value, which picked the brightest candidate instead of the
first.
- Axolotl.playAttackSound (entity.axolotl.attack at pitch 1) never played.
The mob AI harness gets #64's two scenarios, in a pool sunk into the ground
so no water flows out of it: hunting a cod, and playing dead after repeated
hits. Both now match vanilla on every tick (393/393 mob-ticks, was 26).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Verify passes. CI parity's failures are only the known flakes: world_spawn (vanilla gives several spawn heights for one seed across runs) and dedicated_server (play-pearl). This client rendering change can't move either. B2's integration passed every rendering harness, and before/after screenshots are in the body.
🤖 Agent: merged. Verify passes. CI parity's failures are only the known flakes: world_spawn (vanilla gives several spawn heights for one seed across runs) and dedicated_server (play-pearl). This client rendering change can't move either. B2's integration passed every rendering harness, and before/after screenshots are in the body.
On a server or a world open to LAN, a player saw only their own crack.
The server sent each new stage to the others
(ClientboundBlockDestruction), but a client of a server ignored the
packet, and the host of a LAN world neither drew its guests' cracks nor
sent its own to them.
Vanilla keeps the cracks per breaker (ClientLevel.destroyBlockProgress:
a progress outside 0..9 removes it, 400 ticks without news drops it) and
draws, within 32 blocks, the furthest one on each block
(LevelExtractor.extractBlockDestroyAnimation). Horizon now does the
same: a client of a server takes the packet, a LAN host records its
guests' stages and sends its own (each new stage, then -1 when it
stops), and every crack is drawn with its own stage. A guest's crack
also goes when the block it digs is gone before its STOP_DESTROY_BLOCK
(its own tick broke it), as ServerPlayerGameMode.tick clears it on air:
the others kept its last stage for 400 ticks. Each crack vertex carries
its stage sprite's atlas origin in its light bytes (the crumbling pass
is unlit); the shader keeps the shared sprite size.
lan_e2e `cracks`: each side watches the block the other mines and sees
its crack grow; no crack is left once the blocks break. The screenshots
from both sides show the cracks.
Fixes#1096
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Verify passes. Local integration of #1121–#1125 on main 2d586fac: parity --changed, all 101 affected harnesses pass. Screenshots in the body.
🤖 Agent: merged. Verify passes. Local integration of #1121–#1125 on main 2d586fac: parity --changed, all 101 affected harnesses pass. Screenshots in the body.
🤖 Agent: merged. Verify passes. Local integration of #1121–#1125 on main 2d586fac: parity --changed, all 101 affected harnesses pass. Screenshots in the body.
🤖 Agent: merged. Verify passes. Local integration of #1121–#1125 on main 2d586fac: parity --changed, all 101 affected harnesses pass. Screenshots in the body.
🤖 Agent: merged. Verify passes. Local integration of #1121–#1125 on main 2d586fac: parity --changed, all 101 affected harnesses pass. Screenshots in the body.
PotentSulfurBlock.animateTick sends two sulfur_bubbles up through a water
source above a wet potent sulfur block, and one time in ten plays
block.potent_sulfur.noxious_gas. SulfurBubbleParticle rises at -0.04
gravity with 0.85 friction, wiggles sideways, grows from 0.02 to 0.15 and
pops when it leaves a water source, stops rising or travels 3 blocks. Its
provider passes yAux as the Z speed, which is kept.
The particle providers harness gets water worlds for sulfur_bubbles,
bubble and bubble_column_up.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Verify and CI parity pass, and the independent review is OK: 12 update tests; v0.2.0.1 ranks below every 0.2 tag; a 0.2 install is never offered a dated tag.
From 0.2 the game is tagged vX.Y.Z and the launcher [email protected] (docs/versioning.md). The site
took only vYYYY.MM.DD as a game release and launcher-v as a launcher, so it would keep offering
launcher 0.16 and showing the last dated patch notes.
src/versions.js holds the tag test and order (every 0.2 tag above every tag from before, semver
within, a pre-release before its release), shared by build.mjs and main.js; the download button
picks the newest launcher by tag, the notes the newest stable game releases, and the launcher
lookup falls back to launcher@ tags before launcher-v. Nothing shows "0.2" until a 0.2 release
exists. `npm test` runs its tests (node --test).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Ludovic decided (2026-10-21) that the next release is 0.2 for both the game and the launcher, with one
clear scheme instead of vYYYY.MM.DD(.N) and launcher-vX.Y.Z. This page is the design the other 0.2
pull requests implement:
- tags vX.Y.Z and [email protected] (launcher-v0.2.0 is taken), on a line in .github/release-line.txt;
betas stay pre-releases under their final tag; semver pre-release tags reserved for previews;
- one order for every reader: each 0.2 tag above every tag from before;
- how release.yml, launcher.yml and promote.yml map onto it (HORIZON_VERSION, HORIZON_LAUNCHER_TAG);
- what launchers and servers from before 0.2 do with it, and the bridges that move them
(launcher-v0.17.0, the last dated game release made latest before v0.2.0);
- the orchestrator's steps for the day Ludovic says go, freeze off included.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Verify and CI parity pass, and an independent review found no blocking issue. The release, launcher and promote workflows stay disabled with RELEASES_PAUSED=1. Without .github/release-line.txt the train decides exactly as before (checked against every existing tag).
🤖 Agent: merged. Verify and CI parity pass, and an independent review found no blocking issue. The release, launcher and promote workflows stay disabled with RELEASES_PAUSED=1. Without .github/release-line.txt the train decides exactly as before (checked against every existing tag).
🤖 Agent: merged. Verify passes. CI parity's only failure is world_spawn seed -2080727421395798566, where vanilla itself gives several heights across runs (also on main; see #1112). Screenshots in the body.
🤖 Agent: merged. Thank you @feeldev12! Verify passes. A 2-line fix to benchmark tooling: the world folder is created before the marker is written, so slow devices no longer race the async world open.
An ignored test reads vanilla's advancements and item tags from the
prepared resources (HORIZON_RESOURCES) and reports what an inventory
change and a recipe unlock test now. On the Mac mini (release):
inventory_changed has 1914 criteria, the index is built once in 0.75 ms
with the tree (off the tick), and a nine-stack inventory tests 67 of them
(found in 16 us); recipe_unlocked has 1739, an iron pickaxe tests 1.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ServerWaypointManager.removePlayer disconnects every waypoint the player
was receiving: a player who goes to another level gets an untrack for each
player it tracked in the one it left. Horizon's per-level managers tick
with the players in their own level only, so the untrack had no connection
to go to and the player kept the old level's markers.
Each level's manager now also gets the connections of the players in the
other levels, for these untracks.
The player-targets and dimension-players harnesses compare the waypoints
as each step leaves them (the last packet for each waypoint): arriving in a
level, vanilla sends the same waypoint up to three times within the step,
and the packet by packet order is test_locator_bar_parity's. Both pass:
123 and 40 lines identical.
Part of #843
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Two main-thread costs from the hub tick (found on the companion branch with
HORIZON_SPIKES, commit 060c795e; its companion and metering parts stay there):
- Every inventory change tested all ~1,900 inventory_changed criteria, and
every recipe unlocked (an iron ingot unlocks dozens) all ~1,300
recipe_unlocked ones: 1.5-5 ms on such a tick. The tree now indexes
inventory_changed criteria by the items that can pass them (tags resolved;
the few without an item list are always tried) and recipe_unlocked
criteria by recipe, so a change tests the 20-40 that could match. Same
answers: a criterion with an item-limited predicate can only pass with one
of those items held.
- Each log line was an unbuffered stderr write plus a latest.log write under
a mutex on the calling thread; a full pipe or a slow disk held the tick.
The logger now formats the line and keeps it for crash reports on the
calling thread and hands the I/O to a "Log writer" thread; flush() waits
for it (crash report, exit).
(cherry picked from commit 060c795e, companion parts left out)
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Vanilla keeps a ServerWaypointManager per level: a player in another level
is neither a transmitter nor a receiver there. Horizon passed every player
to one manager whatever their dimension, so a player who went to the
Nether stayed tracked at their Nether coordinates by the players left in
the Overworld (`track Bob block 0 100 0`), and nothing was re-tracked when
they came back.
Each level now has its own manager, ticked with the players in that level:
a player changing level leaves the old one (untracked for everyone there,
as ServerLevel.removePlayerImmediately) and joins the new one
(addDuringTeleport). The player-targets and dimension-players harnesses
now compare the waypoints too, instead of leaving them out.
Fixes#843
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A guest's body is rebuilt when it respawns, and its hurt and attack logs
went with the old one: the control socket's hurtlog lost the hurts that
killed it whenever the death and the respawn fell between two reads.
The logs now pass to the new body, and a dead guest's are read too.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit df9fa5f018)
Every hurt a player takes (PlayerMotion::hurt_blocking, which all player
damage goes through) is kept: the damage type, the amount before blocking
and armour, what a raised blocking item stopped, the health and absorption
lost, the armour and armour toughness it met, the fire ticks, the health
left and, for a mob's blow, the knockback it gave. Every melee blow on a
mob is kept too: the damage after the attack strength
(getAttackStrengthScale), the strength, a critical hit, the mob, whether it
landed and killed. The last 64 of each are kept.
`hurtlog` on the control socket hands them out, per player (the host and
each LAN guest), and clears them: a harness can read what a fight did hit
by hit and compare it with vanilla's numbers.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit fdfa952379)
OminousItemSpawner.addAdditionalSaveData keeps its item and
spawn_item_after_ticks; Horizon saved neither, so an ominous trial
spawner's key or potion floating mid-wave vanished when the world closed
or its chunk unloaded. They are now written with the chunk's entities
(UUID and unmodelled fields kept), read back as live spawners whose tick
count starts again from 0 (Entity.tickCount isn't saved), and leave the
level with their chunk.
Fixes#462
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A sleeping guest stood on top of its bed for everyone else: the server
sent its pose but never its bed (LivingEntity.SLEEPING_POS goes only to
the sleeper itself), Horizon's clients had no sleeping pose for other
players, and the host's own models of its guests ignored the bed. A
player paired with the sleeper later (the host walking up from afar)
saw the same.
The tracked state of a sleeping player (the host or a guest) now holds
its bed, so pairing and updates send it, and its removal sends the empty
position back; the clients and the host's guest models lie the player in
the bed as LivingEntityRenderer.setupRotations does for Pose.SLEEPING
(the villagers' sleeping pose, by the bed's facing).
lan_e2e `sleep`: the host draws the sleeping guest lying, the guest the
sleeping host, and neither once they are up.
Fixes#1045
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Like the dragon, a spike's crystal gets its id from the entity counter as
EndCrystal's constructor does, instead of only once a client tracks it: a
player the level serves without a client can then aim at it. The fight's
control status lists each crystal's id and position.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit e32e5031c1)
The dragon read the window's own player for everything: network players
(LAN guests, players on a server) were never targeted, strafed, charged,
knocked back, bitten, breathed on or hit by its fireballs.
- It sees the level's players (the window's and every guest in the level)
through `TargetingConditions.forCombat` as each phase asks
(`Level.getNearestPlayer`): alive, neither creative nor spectator, none on
Peaceful. The holding pattern strafes the enemy nearest the egg, the
landing approach comes in opposite it, the perched dragon scans within 20
blocks (10 up or down) and charges within 150.
- The strafe keeps its own target (`attackTarget`) and goes back to the
holding pattern when it leaves the level.
- A destroyed crystal sends a holding dragon after the player who destroyed
it, else the nearest player (`EnderDragon.onCrystalDestroyed`), when it can
attack them.
- Wing knockback and the head and neck bites, the breath and fireball clouds
and its fireballs act on every player alike; what hits a guest runs as
that guest, its knockback sent to its client.
- The dragon takes its id and its parts' when it is created, so a guest can
attack them in a world without network players too.
A unit test covers the targeting rules (spectators and creative players
passed over, ranges, Peaceful, the nearest to the egg).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit 2eef4e4bf5)
Primed TNT (and falling blocks, projectiles) spawned from /summon get
their entity id only when first tracked, so the summon found no new id
and answered "Unable to summon entity" though the entity was there and
went off. The summon now also counts those lists, and names the type:
"Summoned new Primed TNT", as vanilla.
Test: a TNT summon in the command execution corpus (world group:
125/126 match vanilla; the one left, /waypoint list, was there before).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit dd733684bc)
The world spawn was only filled in when the world was first saved, from
the player's spawn point at that moment: a bed slept in before then became
the world spawn, and anything asking for the world spawn earlier (a
guest's respawn) fell back on the host's spawn point instead.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit 03e621ed3a)
SetPotionFunction was skipped, so the potions a loot table gives came
out with no contents: a piglin's barter never held fire resistance (the
drinkable and splash ones, 16 of 469), only uncraftable potions. The
merchant and /loot code had it; the shared loot evaluator now does too.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit 1b2767122d)
- A perched dragon (scanning, attacking, flaming, hovering) shrugs arrows
off as `AbstractDragonSittingPhase.onHurt` does: no damage, and the arrow
is set alight for a second and turns back instead of being spent. Arrows
that hit a part or a crystal deal the arrow's damage with its Power bonus,
and turn back when the hit is refused (a dying dragon, an invulnerable
crystal).
- The damage cooldown is `LivingEntity.hurtServer`'s: within it a stronger
hit lands its excess over the last one instead of being dropped; the hurt
sound plays only for a new hit.
- Explosions hit as `ServerExplosion.hurtEntities` does: the dragon itself
(its body) and then each part, each by its distance and its exposure
(`getSeenPercent`, so cover protects it), through the cooldown; and every
end crystal in reach blows up, not only the first.
`Dragon::hurt` and `Dragon::explosion_hits` are pure, with unit tests for
the perched arrows, the cooldown's excess, the parts' quarter plus one,
the take-off after a quarter of its health, and exposure.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit c730ed9ed8)
On a dedicated server (and single player's server thread) the End is ticked
with no local player, and `tick_fight` returned before spawning the dragon:
players in the End found crystals but never a dragon.
- The fight finds its players as `EnderDragonFight.updatePlayers` does, every
20 ticks: every player alive within 192 blocks of (0, 128, 0), the host and
the network players in the level alike. Scanning the state, the respawn
sequence, `createNewDragon` and the crystal count run while it has one;
the dragon and crystals tick whenever the End does.
- The dragon is tracked to network players (`minecraft:ender_dragon`, its
health and `DATA_PHASE` as vanilla pairs them, no attribute instances) and
reserves its eight part ids after its own, as `EnderDragon`'s constructor
does, so clients can attack the parts; a network player's attack on a part
or an end crystal is aimed at it.
tools/test_server_dragon_parity.py sends a lone vanilla-codec client to the
End of vanilla's dedicated server and of Horizon's: the fight starts and the
dragon is tracked with the same spawn data, synched data entries and
attributes. VanillaProtocolClient's entity mode answers a scene's teleport
with the acceptance alone, as the 26.3 client does.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
(cherry picked from commit 618db927d9)
release.yml builds every game release with HORIZON_VERSION, the tag without its v
(docs/versioning.md), as launcher.yml already does for the launcher: no version-bump commits.
- horizon_core::release::{RELEASE, VERSION}: the built-in version, or Cargo.toml's for a build from
source. (horizon_core::version stays Minecraft's, generated by gen_version_consts.py.)
- horizon-server and horizon-prepare --version, the server's /api/v1/status, horizon-ctl's MCP
serverInfo and the "Horizon/<version>" user agents use it; they all said 0.1.0.
- The client's crash reports and telemetry say v0.2.3 from the built-in version wherever the game
is installed; releases from before 0.2 (no version built in) still read the launcher's folder name.
- The launcher's benchmark telemetry used Cargo.toml's version instead of the release's.
- release.yml checks that horizon-prepare and horizon-server --version say the release's version.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Verify passes. Local integration of #1109–#1112 on main ae21bd54: parity --changed 142/142. After the rebase onto #1094: 101/101, with screenshots in the body.
🤖 Agent: merged. Verify passes. Local integration of #1109–#1112 on main ae21bd54: parity --changed 142/142. CI parity's world_spawn diff (seed -2080727421395798566) also happens on main: vanilla itself gives y64/65/66/72 across runs. The other failure is the known dedicated_server pearl flake.
🤖 Agent: merged. Verify passes. Local integration of #1109–#1112 on main ae21bd54: parity --changed 142/142, with before/after item counts in the body.
The station screens' hand-written quick move put a payment stack's first item
into the beacon, fell back to the other inventory half when an enchanting,
grindstone, stonecutter, cartography or anvil rule's own slots were full, and
sent every input back hotbar-last-first. Follow each menu's quickMoveStack
(EnchantmentMenu, BeaconMenu, GrindstoneMenu, StonecutterMenu,
CartographyTableMenu, ItemCombinerMenu with SmithingMenu's
canMoveIntoInputSlots), repeated as doClick's QUICK_MOVE does.
A local brewing stand's clicks now run on the verified menu engine, as a
server's already did, so its shift-clicks, drags (quick craft) and double
clicks are BrewingStandMenu's, which test_menu_click_parity covers.
Part of #275
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The menu style is one process-wide flag, and options tests switch it to lay
out a page in Horizon's or Classic's style. Running in parallel, one test's
switch moved another's widgets (classic_graphics_presets_set_the_distances
failed 4 of 200 runs of the options tests). Under cfg(test) the flag is a
thread local, Classic first; the game keeps the shared atomic.
Fixes#802
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The title box is an unbordered, centred EditBox (black, no shadow) in
vanilla. Horizon kept Ctrl/Cmd+A's selection but never drew it, and centred
the title together with its cursor. Draw it with ui::append_field (now with
a text shadow flag): the value centred alone, the cursor after it, and the
inverted highlight. horizon-ctl gets the super (Cmd) and F6 key names, and
A/C/V/X with the edit modifier held act on the open book.
Part of #275
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Classic Extras laid every setting out as a full-width button. Pair each
section's buttons as vanilla's OptionsList.addSmall does (the same layout as
Video Settings), and shorten "Lower sensitivity while zoomed" to "Slower
turning" so it fits a half-width button.
Horizon's Extras page shows a switch's own settings (Zoom key, Minimap size,
FPS corner...) only while that switch is on, so it stays one row per extra
as the list grows. Classic keeps every button, as vanilla screens do.
Fixes#812Fixes#815
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A world's session.lock is an flock held by the open file. Closing the file
releases it only once every copy of the descriptor is gone, and a process
spawned on another thread holds a copy until it execs. Under a parallel
cargo test (crash reports spawn uname/sw_vers), deleting a world right after
dropping its lock could then fail with "already open". Unlock explicitly
in Drop, as vanilla releases the FileLock before closing the channel.
Fixes#749
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A centred mono source played at full gain on each channel; OpenAL Soft
(vanilla's LWJGL build, HRTF off) renders stereo pairwise: 0.596 per side
ahead, 0.404 behind, 0.5 above or below. Explosions were 4.5 dB louder than
vanilla. Pan with the camera's forward and up vectors, play a mono output
unpanned, and release the limiter over 0.2 s like OpenAL Soft's.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
docs/versioning.md: with .github/release-line.txt (MAJOR.MINOR) the train tags game releases
vMAJOR.MINOR.PATCH and launcher releases [email protected], the patch after the newest
release on the line; the line's first release goes out at once (still not while RELEASES_PAUSED is
set). Without the file nothing changes: vYYYY.MM.DD[.N] and launcher-vX.Y.Z. The file is not added
here; the switch to 0.2 is a separate one-line pull request for the day Ludovic says go.
- tag_key: every 0.2 tag ranks above every dated or launcher-v tag; semver order within, a
pre-release before its release. release_channels.py uses the same key and tag test, so promotion
and "latest only moves forward" work across the switch.
- A line's first release says so in its notes; 0.2.0's explains the numbering and how a server
that says it is up to date takes it (horizon-server update --version v0.2.0).
- launcher.yml strips either prefix for HORIZON_LAUNCHER_VERSION and passes HORIZON_LAUNCHER_TAG,
which the launcher uses to know its own line.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
From 0.2 the game is tagged vX.Y.Z and the launcher [email protected] (docs/versioning.md). The launcher
compared every tag number by number, so it would never offer game v0.2.0 over v2026.10.19.15 nor
update itself to 0.2.0 from 0.16.0 (launcher-v0.2.0 is also taken by an old release).
- release_order(): tags from before 0.2 (vYYYY.MM.DD[.N], launcher-vX.Y.Z, bare versions) compare as
before; every 0.2 tag follows them, in semver's order (a pre-release before its release).
- own_tag(): the tag this launcher was released as. launcher.yml will pass HORIZON_LAUNCHER_TAG; a
release with only HORIZON_LAUNCHER_VERSION was a launcher-v one; a build from source is on 0.2.
So the last launcher-v release (the bridge old launchers can see) updates itself to launcher@.
- The matching-refs fallback looks for launcher@ tags first, then launcher-v.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
From 0.2 Horizon's game releases are tagged vMAJOR.MINOR.PATCH (docs/versioning.md). newer() compared
tags number by number, so v0.2.0 looked older than v2026.10.19.15 and an installed server would never
offer or install it. Every semver tag now outranks every date tag; within semver, patch and minor
compare as numbers and a pre-release (v0.3.0-rc.1) comes before its release. Pruning old releases
sorts with the same order.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Verify passes. Local integration of #1101–#1107 on main caeffffb: parity --changed 302/304, and the two failures (block_particles, entity_model) fail identically on plain main. CI parity's secure_chat failure on #1101 logged 'transcripts identical' (flaky).
🤖 Agent: merged. Verify passes. Local integration of #1101–#1107 on main caeffffb: parity --changed 302/304, and the two failures (block_particles, entity_model) fail identically on plain main. CI parity's secure_chat failure on #1101 logged 'transcripts identical' (flaky).
`open` replies once the world starts opening on a worker, so the save
folder may not exist yet when the benchmark writes horizon-benchmark.txt
into it. On a slower device (an Android phone) the write failed with
"No such file or directory" and the run ended before the first scene.
With the camera above the build height (or below the bottom), vanilla's
SectionOcclusionGraph.initializeQueueForFullUpdate seeds the search with
the top (bottom) layer of sections around the camera instead of the
camera's own section. Horizon started from the camera's section and could
only step one section past the world's edge, so from y 352 up (two
sections above the top) it reached nothing and every chunk vanished.
Fixes#1037
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Verify passes; CI parity passes except dedicated_server, which fails the same way on main (play-pearl teleported 0 vs 1, the known flake in FEATURES.md LATER).
🤖 Agent: merged. Verify passes; CI parity passes except dedicated_server, which fails the same way on main (play-pearl teleported 0 vs 1, the known flake in FEATURES.md LATER).
🤖 Agent: merged. Verify passes; CI parity passes except dedicated_server, which fails the same way on main (play-pearl teleported 0 vs 1, the known flake in FEATURES.md LATER).
Moving blocks are minecraft:moving_piston blocks with a block entity.
The client drew nothing for them and gave them no collision, so pistons
on a clock flickered and players walked through them (#935).
The world now keeps a copy of the level's moving-piston block entities.
SceneCollisions::moving_piston_shape returns their shape
(PistonMovingBlockEntity.getCollisionShape, already in piston_shape),
and game/moving_pistons.rs ports PistonHeadRenderer: the moved block at
its interpolated offset, the moving head's short state, and a retracting
piston's head and extended base.
Entity pushing (moveCollidedEntities) is not ported yet.
Fixes#935
Co-Authored-By: Claude Opus 5.5 <[email protected]>
BoatRenderer draws its water_patch part with RenderTypes.waterMask (depth
only) unless the boat is under water, so translucent water behind it fails
the depth test inside the hull. Horizon loaded the part but never drew it:
the water surface showed through the boat. The patch now draws with a
depth-only Water mask pipeline after the entities and before translucent
terrain (rafts have none, as RaftRenderer).
Turning in a boat stepped the camera at the tick rate: positionRider adds
the boat's deltaRotation to the passenger's yRot after its yRotO was kept,
and LocalPlayer.getViewYRot interpolates a passenger's yaw between them.
The camera now spreads the turn over the tick's frames.
Fixes#1016
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The camera's biome alone gave the sky, fog and water fog colours, so they
jumped at every biome boundary (most visibly the Nether fog). Vanilla's
EnvironmentAttributeProbe weights the noise biomes of a 6x6x6 quart
neighbourhood around the camera with GaussianSampler's kernel and lerps
the spatially interpolated attributes between them
(SpatialAttributeInterpolator, ARGB.srgbLerp); unloaded chunks count as
plains.
Fixes#797
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A thrown splash or lingering potion or experience bottle was a stand-in
terrain particle spawned at its tick position: darkened by the terrain
particle colour, without the potion's colour, two overlapping copies and
no interpolation between ticks. Draw it as vanilla's ThrownItemRenderer
does: the item model (GROUND, with the potion tint) facing the camera,
interpolated, lit at its light probe, hidden for its first two ticks near
the camera (ThrowableProjectile.shouldRenderAtSqrDistance). Witch potions
draw as the splash potion of their effect instead of a bare bottle.
Fixes#818
Co-Authored-By: Claude Opus 5.5 <[email protected]>
EndCrystal.tick advances the crystal's time wherever it is; only the fire
at its block needs a dragon fight. Horizon advanced it only during the End
fight, so a crystal placed elsewhere kept a fixed time and jumped back
every tick (it flickered instead of turning).
Fixes#1051
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Breaking, mining, landing and other block particles took the block's up
face and a fixed grass or foliage colour, so grass blocks crumbled as
tinted grass tops (moss-like). Vanilla's TerrainParticle uses the model's
particle material (first variant / first multipart selector) and tint
source 0's colorAsTerrainParticle: the biome-blended in-world colour,
none for grass blocks (BlockTintSources.grassBlock) or blocks without a
source. The in-wall screen overlay and block markers use the particle
material too.
Fixes#1034
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The glide flag is the server's: LivingEntity.updateFallFlying clears it when
canGlide fails (the player is on the ground), from the position the client
sent, and the client gets the change on its next tick. So in vanilla a glide
that lands goes on for one tick on the ground, with travelFallFlying's drag
instead of ground friction, and a jump on that tick (with its sprint boost)
keeps the speed: the elytra hop. Horizon ended the glide on the landing tick,
so each hop lost about half of the speed to ground friction.
Fixes#1056
Co-Authored-By: Claude Opus 5.5 <[email protected]>
BeehiveDecorator stores 2 or 3 bees in the nest's block entity. World
generation kept them, but trees placed in the live level (a sapling grown next
to flowers, which picks the *_bees_005 trees, and /place feature) dropped them:
LevelFeatureWorld had no store_beehive_occupants, so the nest had no block
entity at all. Breaking it released nothing and bees could not enter it.
LevelAccess gets load_block_entity, the game loads the occupants into the
nest's block entity, and the occupant NBT is shared with world generation.
Fixes#1097
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Player.attack adds causeExtraKnockback after the hurt: the weapon's knockback
enchantment (halved) plus 0.5 for a sprinting full-strength hit, pushed along
the attacker's yaw (sin, -cos) rather than away from it, which lets a player
steer a hit target by turning while attacking (knockback displacement).
Horizon had only the enchantment part, on mobs; sprinting hits added nothing
and players (LAN PvP) got no extra knockback at all. Now:
- player hits on mobs and players: one extra knockback of that strength with
LivingEntity.knockback (knockback resistance, lift only from the ground),
the attack.knockback sound, and the attacker's sprint stops;
- the knockback a player takes (mob and PvP hits, dealDefaultKnockback with
0.4) reads its knockback resistance (netherite) and only lifts from the
ground: an airborne player kept being thrown up by every hit.
Fixes#504
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The player's ATTACK_DAMAGE and ATTACK_SPEED modifiers change in
LivingEntity.detectEquipmentUpdates, once a tick, while Player.attack reads
the weapon's enchantments and smash bonus from the stack in hand at the
attack. So swapping hotbar slots just before an attack hits with the old
item's damage and charge and the new item's enchantments (a Wind Burst or
Breach mace after another weapon): attribute swapping. Horizon read both from
the item in hand at the attack.
Also Player.tick's reset: switching to a different item now resets the attack
strength the damage uses (only the indicator's ticker reset before), for the
host and for LAN guests.
Fixes#505
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Two Blast Protection pieces now cancel explosion knockback (#1049):
- ServerExplosion.hurtEntities scales knockback by EXPLOSION_KNOCKBACK_RESISTANCE
for living entities. The player's knockback ignored it, and mobs used
KNOCKBACK_RESISTANCE (iron golems were never pushed; vanilla pushes them,
every type's explosion resistance base is 0).
- EnchantmentAttributeEffect.idForSlot: the modifier id ends with the slot,
so the same enchantment on two armor pieces adds up. The id was
<id>.<level>, so the second piece replaced the first.
- hitPlayers skips creative players who are flying: no knockback for them.
Fixes#1049
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Minecraft.handleKeybinds only calls startUseItem while the player is not
using an item: use clicks are consumed and held use doesn't repeat. Horizon
repeated held use every 4 ticks regardless, so with a shield raised in the off
hand, aiming at a block placed the main hand's block (or spawn egg, boat...).
Fixes#1050
Co-Authored-By: Claude Opus 5.5 <[email protected]>
LivingEntity.updateFallFlying starts with Entity.checkFallDistanceAccumulation:
while gliding and falling slower than 0.5 blocks a tick, the fall distance is
capped at 1. Horizon kept accumulating it for the whole glide, so landing after
gliding down (or after climbing and gliding back) dealt the full drop's damage.
Fixes#1046
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Verify and CI parity pass on the rebased head (b591c9dc), with before/after frame times in the body (rain 561 → 759 FPS, snow 663 → 981 on the Mac mini).
Low leaves can hide every face of the trunk's bottom log from where the
walk stops ("no face of block ... is visible from here"). The scenario
now breaks inside the tree loop and moves on to the next tree, as it
already did for one it cannot reach.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
- survival and ui asserted that the Create New World click itself
answered `playing`. Since 7f4193f8 the in-frame world is prepared off
the UI thread behind the title screen, so the click answers `title`
and both scenarios failed in the frame (main's default) every time.
They now wait for `loaded`, as the other scenarios do.
- The survival spawn is random within the spawn radius, on the first
full top face below the MOTION_BLOCKING height
(PlayerSpawnFinder.getLevelRespawnPos), so a tree's leaves too: from
there no tree was reachable within goto's three-block drops. The
scenario now drops the player to the ground under the leaves first.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Vanilla's spawn chunks load by ticket level, so the level loading screen's
chunk map fills in Chebyshev rings. While the loading screen is up,
Horizon now picks chunks ring by ring (nearest first inside a ring)
instead of by Euclidean distance, which grew a disc.
Fixes#770
Co-Authored-By: Claude Opus 5.5 <[email protected]>
check_xp makes the host a spectator, out of the orbs' way, and left it
one for the rest of the run. A spectator sinks (Player.travel keeps 0.6
of its vertical speed each tick, about 0.2 blocks from standing), so the
next check that made it survival again, swings, landed it inside the
floor with the guest teleported beside it: the guest's feet were in the
floor's stone, which hid the dirt it tills from every angle ("no face of
block ... is visible from here"). It failed only after the earlier
checks, never alone.
check_xp now ends in survival where the host stood, as check_trials
already does.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ItemEntity.tick merges a dropped stack with mergeable items whose boxes
meet its own grown by half a block sideways, every 2 ticks while it moves
between blocks and every 40 otherwise (mergeWithNeighbours, tryToMerge,
merge). Horizon never merged, so fresh chunks, where water and falling
blocks break leaf litter, moss and plants, filled up with single items.
FallingBlockEntity.tick also places (or breaks) the block within the
entity's own tick. Horizon moved every falling block first and placed them
after, so a block falling right behind another landed in the same cell and
broke into an item: stacked sand and gravel in fresh chunks dropped.
Fixes#996
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The oracle prints every ProtoChunk postprocessing position and chunk_dump
prints Horizon's, so a chunk that schedules different fluid or shape
updates after generation (the blocks that later tick and drop items in
fresh chunks, #996) fails the harness.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Verify passes. The change runs only on the server thread (opt-in today), and the PR body's proof shows lan_e2e --server-thread going from 35/39 to 38/39. #1072's switch needs it.
🤖 Agent: merged after integration C: the desktop ran 322/325 harnesses on main + #1088–#1093, and its 3 failures were the known dedicated_server flake plus the two display harnesses; world_reopen and save_roundtrip pass on the Mac mini (main + the six branches).
🤖 Agent: merged after integration C: the desktop ran 322/325 harnesses on main + #1088–#1093, and its 3 failures were the known dedicated_server flake plus the two display harnesses; world_reopen and save_roundtrip pass on the Mac mini (main + the six branches).
🤖 Agent: merged after integration C: the desktop ran 322/325 harnesses on main + #1088–#1093, and its 3 failures were the known dedicated_server flake plus the two display harnesses; world_reopen and save_roundtrip pass on the Mac mini (main + the six branches).
🤖 Agent: merged after integration C: the desktop ran 322/325 harnesses on main + #1088–#1093, and its 3 failures were the known dedicated_server flake plus the two display harnesses; world_reopen and save_roundtrip pass on the Mac mini (main + the six branches).
🤖 Agent: merged after integration C: the desktop ran 322/325 harnesses on main + #1088–#1093, and its 3 failures were the known dedicated_server flake plus the two display harnesses; world_reopen and save_roundtrip pass on the Mac mini (main + the six branches).
🤖 Agent: merged after integration C: the desktop ran 322/325 harnesses on main + #1088–#1093, and its 3 failures were the known dedicated_server flake plus the two display harnesses; world_reopen and save_roundtrip pass on the Mac mini (main + the six branches).
SectionOcclusionGraph.runUpdates, both rules Horizon left out:
- a section leads on through whatever any face it was entered through
connects to (Node.sourceDirections), not only the first one;
- beyond 3 sections from the camera, a step is taken only if the line
from the section's corner towards the camera, in 28-block steps while
farther than 60 blocks, stays in sections the search has reached.
The search takes the camera position for the ray test. Exact equivalent
of vanilla's, faster: one ray per axis per node (both steps along an
axis share the corner; while the camera stays in the searched-from
section no point falls in a neighbour the loop adds), an answer per
section corner during a full search (neighbours share corners; reached
sections are only added, so a line that stayed in them still does, and
one that failed is checked again from the sample it failed at, stepping
over the earlier ones with the same additions), and an integer floor
instead of libm's on x86-64. Tests compare every cell with a literal
port of runUpdates (map of nodes, FIFO, JOML arithmetic), and a resumed
line with one checked from its corner.
Fixes#782
Co-Authored-By: Claude Opus 5.5 <[email protected]>
WeatherEffectRenderer reads level.getHeight(MOTION_BLOCKING, x, z) for
every column within the weather radius. Horizon scanned each column block
by block from 10 blocks above the radius down to the ground, with a
string search per block, every frame: about half a millisecond of CPU per
frame in rain on a Ryzen, more on laptops (#899). Client chunks now keep
a MOTION_BLOCKING map next to their WORLD_SURFACE one, built on the first
read and dropped by writes that can move it, from the facts world
generation already uses (blocks_motion_in_heightmap or a fluid).
This is also vanilla's rule where the scan differed: slabs, stairs and
other motion-blocking blocks without a full collision box now stop rain,
and a roof more than 20 blocks above the camera does too.
Tiling a column at each texture repeat no longer allocates two vectors
per column.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
owner_console_command ran the window's commands as the world's owner with
the hub taken out, so a selector saw only the owner (`team join … @a` left
the guests out, and friendly fire still hurt) and `defaultgamemode` never
reached the hub (guests joined in the world's old mode). It now puts the
hub back while the command runs, as run_guest_commands does for a guest.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Title backdrop built on a worker (fixes#896). Integration proof (main + #1079#1081#1082#1083#1085#1086#1087), 2026-10-21: desktop parity 103/105; the 2 others (world_reopen, save_roundtrip) need a display and pass on the Mac mini. Verify passed.
🤖 Agent: merged. Creative pick block in inventories (fixes#1048, Visivel). Integration proof (main + #1079#1081#1082#1083#1085#1086#1087), 2026-10-21: desktop parity 103/105; the 2 others (world_reopen, save_roundtrip) need a display and pass on the Mac mini. Verify passed.
🤖 Agent: merged. Firework tooltips (fixes#1047, Visivel). Integration proof (main + #1079#1081#1082#1083#1085#1086#1087), 2026-10-21: desktop parity 103/105; the 2 others (world_reopen, save_roundtrip) need a display and pass on the Mac mini. Verify passed.
🤖 Agent: merged. Cobwebs slow falling blocks (fixes#933). Integration proof (main + #1079#1081#1082#1083#1085#1086#1087), 2026-10-21: desktop parity 103/105; the 2 others (world_reopen, save_roundtrip) need a display and pass on the Mac mini. Verify passed.
🤖 Agent: merged. Stars built once (fixes#1054, Visivel and rdbtCVS). Integration proof (main + #1079#1081#1082#1083#1085#1086#1087), 2026-10-21: desktop parity 103/105; the 2 others (world_reopen, save_roundtrip) need a display and pass on the Mac mini. Verify passed.
🤖 Agent: merged. Blocks can't be placed into entities (fixes#1052, Visivel). Integration proof (main + #1079#1081#1082#1083#1085#1086#1087), 2026-10-21: desktop parity 103/105; the 2 others (world_reopen, save_roundtrip) need a display and pass on the Mac mini. Verify passed.
🤖 Agent: merged. Shears carve pumpkins (fixes#1067, reported by Tydragon). Integration proof (main + #1079#1081#1082#1083#1085#1086#1087), 2026-10-21: desktop parity 103/105; the 2 others (world_reopen, save_roundtrip) need a display and pass on the Mac mini. Verify passed.
- sprites: vanilla models name the missing texture on purpose (block/air.json's
particle is minecraft:missingno), so using it is not worth a warning (#853).
- audio: when the resources hold no sounds.json, the game plays nothing on a
working output and the log said only which device opened. It now says the
sounds were not copied and how to fix it (#1035, #1076).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A player installed Java 25 but JAVA_HOME still named an older JDK, so
Prepare stopped with "Java 25 is needed", and the launcher showed that
error at the foot of the page, out of sight until the window was enlarged.
- horizon-prepare java::find: after JAVA_HOME, the PATH and macOS's
java_home, look in the folders JDK installers use (Program Files vendors
on Windows, /usr/lib/jvm on Linux, JavaVirtualMachines on macOS, ~/.jdks,
SDKMAN), JDKs named for the pinned major first.
- launcher: the preparation's progress and error sit right under the
buttons instead of below the rows.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The client JAR ships an empty font/include/unifont.json; the real provider
list and font/unifont.zip, unifont_jp.zip and unifont_pua.zip (1.9 MB) come
only from the asset index, which preparation never copied. Every character
the bitmap fonts lack showed as a missing-glyph box (a server's "▸").
Full preparation now imports them after extracting the JAR, like the title
panorama, and `horizon-prepare fonts` repairs prepared resources.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Mojang republished the 26.3 version JSON again (sha1 61fff131), with a new
asset index 34 (0c8f43b2) that changes only 142 translation files. A launcher
keeps one indexes/34.json, so every install made since then, official
launcher or Prism, failed the "pinned asset index" check: no sounds and no
title panorama.
- research-lock.json: accept the new version JSON, and list the asset
indexes of every accepted version JSON (accepted_asset_index_sha1).
- horizon-prepare: an index the lock does not know is still used, with a
line in the log, since every object copied from it is checked against its
own SHA-1; the sounds now require minecraft/sounds.json in the index.
- tools/lab.py: the same for the dev tools.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Measured on an Intel HD 620 (#897): rain and snow cost about 3 ms of GPU
per frame there, most of it from the weather radius; FXAA about 0.8 ms;
cave culling saves about 0.6 ms; mipmaps cost nothing measurable and
clouds about 0.1 ms. A new Cost::Saves tag ("Saves time", in the success
colour) marks a setting that makes frames faster when on.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The integrated and dedicated server loops paced every tick at the tick rate,
so /tick sprint ran at 20 tps and never reported, and the integrated server
recorded no tick times for /tick query. They now share
MinecraftServer.runServer's pacing: no wait while sprinting, the sprint's
report sent to the operators as the server's, and tick times recorded.
The hub broadcasts ClientboundTickingStepPacket when a step starts or stops
(ServerTickRateManager.updateStepTicks) and sends a joining player the
steps left, not 0.
The camera, hand, view bobbing and the player's own model use
Camera.getCameraEntityPartialTicks (getGameTimeDeltaPartialTick(true)), so
they stay smooth while the level is frozen instead of moving at 20 Hz.
Fixes#1038
Co-Authored-By: Claude Opus 5.5 <[email protected]>
start_backdrop built VanillaTerrain on the event loop, so the title stopped
drawing for the whole build: 2.1 s cold and 0.86 s warm on an M4 Pro (fast
profile), far longer on slow CPUs. The worker now builds it and finds the
spot; the title draws its panorama until the generator is installed.
Fixes#896
Co-Authored-By: Claude Opus 5.5 <[email protected]>
BlockItem.canPlace now checks every entity whose blocksBuilding is set: mobs,
armor stands (not markers), boats, minecarts, end crystals, primed TNT and
falling blocks, not only players.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Linux dedicated servers lower their world-generation and packet-writer threads behind the server thread; nothing changes elsewhere. verify passed; parity: every harness passes except dedicated_server, which is flaky on main with the same failure modes (7-run A/B against main in the last comment).
The middle button (keyPickItem) over an inventory or the creative screen no
longer clicks like the left button: with infinite materials it clones the
hovered stack at full size (CLONE) or, holding a stack, drags full stacks into
slots (quick craft type 2); otherwise it does nothing. Agents can middle-click
widgets (click ID middle), and creative slots are ui widgets now.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Rockets list their flight duration and each run of equal explosions (shape,
colours, fade colours, trail, twinkle); firework stars list their explosion.
Both honour TooltipDisplay. New harness: tools/test_firework_tooltip_parity.py.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A falling block's move now runs vanilla's checkInsideBlocks along its path: a
cobweb it passes or lands in makes it stuck (0.25, 0.05, 0.25), which scales
its next move and zeroes its velocity, and resets its fall distance.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Right-clicking a pumpkin with shears now carves it like vanilla: a carved
pumpkin facing the clicked side (the side facing the player on the top and
bottom), four pumpkin seeds from carve/pumpkin popped out of that side, the
carve sound, one point of wear, the shear game event and the used
statistic. A pumpkin carved on a golem base builds the golem, as
CarvedPumpkinBlock.onPlace does; the dispenser shares that placement.
use_item_on parity: pumpkin cases on any face with the player turned any
way (the oracle and fixture take an optional yaw and face).
Fixes#1067
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Verify passed. Integration proof (main + #1041#1043#1021#1020#1032#659#1029#1066), 2026-10-21: 97 of 100 harnesses passed on the desktop. world_reopen and save_roundtrip need a display there; they pass on the Mac mini with #1041/#1043. dedicated_server is a pre-existing flake: it fails on plain main too, and is pass/fail in 2 runs on the integration.
🤖 Agent: merged. Verify passed. Integration proof (main + #1041#1043#1021#1020#1032#659#1029#1066), 2026-10-21: 97 of 100 harnesses passed on the desktop. world_reopen and save_roundtrip need a display there; they pass on the Mac mini with #1041/#1043. dedicated_server is a pre-existing flake: it fails on plain main too, and is pass/fail in 2 runs on the integration.
🤖 Agent: merged. Verify passed. Integration proof (main + #1041#1043#1021#1020#1032#659#1029#1066), 2026-10-21: 97 of 100 harnesses passed on the desktop. world_reopen and save_roundtrip need a display there; they pass on the Mac mini with #1041/#1043. dedicated_server is a pre-existing flake: it fails on plain main too, and is pass/fail in 2 runs on the integration.
🤖 Agent: merged, thanks @rdbtCVS! World saves are spread over frames and keep the session lock until every write is durable (with my small clippy fix). Integration proof (main + #1041#1043#1021#1020#1032#659#1029#1066), 2026-10-21: 97 of 100 harnesses passed on the desktop. world_reopen and save_roundtrip need a display there; they pass on the Mac mini with #1041/#1043. dedicated_server is a pre-existing flake: it fails on plain main too, and is pass/fail in 2 runs on the integration.
🤖 Agent: merged, thanks @rdbtCVS! Local worlds are prepared on a worker; the loading screen keeps drawing. Integration proof (main + #1041#1043#1021#1020#1032#659#1029#1066), 2026-10-21: 97 of 100 harnesses passed on the desktop. world_reopen and save_roundtrip need a display there; they pass on the Mac mini with #1041/#1043. dedicated_server is a pre-existing flake: it fails on plain main too, and is pass/fail in 2 runs on the integration.
🤖 Agent: merged, thanks @ItsPotatoTime! The action bar, title, subtitle and boss bar names now resolve legacy § codes, like the sidebar since #1003 and like vanilla's StringDecomposer.
🤖 Agent: merged. Every merge condition holds: the latest stable game release (v2026.10.19.15) and launcher release (launcher-v0.16.0) verify against the release key, legacy_releases.py --check passes, and launcher and horizon-server built from this branch install signed, pinned-legacy and beta releases and refuse an edited SHA256SUMS, an altered archive and a missing signature. verify passed; parity proof in the last comment.
Lithium, FerriteCore, ImmediatelyFast, Gnetum, ScalableLux, Structure
Layout Optimizer, AsyncParticles and Ixeris: per technique, the vanilla
cost it targets, whether Horizon already avoids it, and whether it is
worth measuring. From public descriptions only; no mod code read.
Fixes#991
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged inert. Without the MACOS_SIGN_IDENTITY variable (not set: Ludovic's Developer ID and notary setup don't exist yet), every new signing/notarizing step is skipped and the release, launcher, sign and promote pipelines are unchanged; verify and parity passed on this head, a launcher dry run passed with signing skipped, and today's ad hoc launcher bundle passes the new self-update signature check. Setting it up is in FEATURES.md LATER (4b).
Servers send § codes inside a component's text. Vanilla's font applies them to every literal, but the action bar, title, subtitle and boss bar names drew the component raw, so the codes showed as glyphs. Resolve them before measuring and drawing, as the sidebar already does.
Co-Authored-By: cairn-code (DeepSeek V4.1 Flash) <[email protected]>
🤖 Agent: merged, thanks @ItsPotatoTime! Prefers an 8-bit non-sRGB surface (Bgra8Unorm/Rgba8Unorm) instead of RADV's fp16 ExtendedSrgb one, so colours are no longer washed out on Wayland. Mac and Windows already got Bgra8Unorm. Verify passed; parity doesn't cover surface formats.
SkyRenderer.buildStars builds the 1500 star quads once into a static
buffer; Horizon regenerated them on the CPU and uploaded about 200 KB of
vertices every frame while stars were out, which made nights cost more
than days (#1054). The stars now live in a static vertex buffer built
when the renderer starts, drawn after the sun and moon with one small
uniform: the view projection times the sky's rotation, and the star
brightness.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Rgba16Float is the first non-sRGB format RADV advertises on Wayland, and wgpu gives it the linear ExtendedSrgb color space. The renderer writes gamma-encoded values, so the compositor read them as linear light and washed every colour out.
Prefer Bgra8Unorm or Rgba8Unorm and keep the old choice as the fallback. A screenshot on a surface that is not 32-bit now reports an error instead of copying with an 8-bit row stride, which aborted wgpu validation.
Co-Authored-By: cairn-code (DeepSeek V4.1 Flash) <[email protected]>
🤖 Agent: merged. Docs only (README and website/docs): the Servers page is in launcher 0.15+, and releases go from beta to stable. Verify passed; parity doesn't cover docs. This also redeploys playhorizon.dev, which still showed the 10-19 14:29 build.
horizon_core::VANILLA_VERSION is a re-export, which left the datafix harness's
PARITY_RUST_SCOPE open: its six shards reran on any Rust change.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
lab.VERSION, lab.GAME (.local/minecraft/<version>) and lab.RESOURCES
(.local/horizon-client/<version>) come from the lock, and lab.version_info()
reads the pinned client jar's version.json. Every harness, generator and
tool that named 26.3 (resource folders, jar and source paths, result
records, the vanilla client's --version and asset index, the bare login
client's protocol, the benchmark's options.txt data version, the packet id
table's header) uses them, so a candidate worktree pinned to another version
runs them unchanged.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
tools/gen_version_consts.py writes what the pinned client jar's version.json
states (name, id, protocol, data version, pack formats, Java, stable, build
time) into horizon_core::version, and every Rust site reads it from there:
PROTOCOL_VERSION, GAME_VERSION, DATA_VERSION, the save's and the datafixer's
version name, /version, the crash report, the legacy ping, the dedicated
server's start line, the title screens, the default resource folder, the
resource pack format, and the launcher's and horizon-ctl's fallbacks. CI
checks the file against the pinned jar.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
- crates/horizon-release-sign/legacy-releases.txt pins the SHA-256 of every archive of the 131 releases published
before signing (GitHub's upload digests, written by tools/ci/legacy_releases.py). The launcher and
horizon-server update install those releases only with exactly those files, so rolling back to one works and
nobody can swap its files later; every other release needs its signed SHA256SUMS.
- the_launcher_ships_with_a_release_key and horizon_server_ships_with_a_release_key fail while
release-keys.txt lists no key, so this can't ship refusing everything.
- Test tags moved to v2099.* so they never collide with a pinned release.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The launcher (game installs and its own updates) and `horizon-server update` fetch a release's
SHA256SUMS and SHA256SUMS.sig, check the signature against the keys built in from
crates/horizon-release-sign/release-keys.txt and the archive against the signed SHA-256, and
refuse anything unsigned, signed for another tag or by another key, or that doesn't match, with a
message saying why. Merge only once release-keys.txt lists the key and a signed stable release
exists: until then every download is refused.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
With the repository variable MACOS_SIGN_IDENTITY set, the launcher's Horizon.app and .dmg and the
game's three programs are signed with the hardened runtime and a timestamp, notarized and (app,
dmg) stapled, from a keychain of the Mac mini's own that keychain.sh unlocks with its password from
1Password. Unset, everything is signed ad hoc as before. The launcher checks an updated bundle's
signature before and after swapping it in, and puts the old one back when it doesn't hold.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged on verify. Test-only (a Python test fixture and a temp-folder name inside a #[test] fn), so no harness can see it; it turns main's verify green again after #235 and removes a horizon-server test flake.
a_stopped_server_saves_and_keeps_comments (settings.rs) and
writes_properties_and_syncs_back (config.rs) both used
horizon-server-config-<pid>, so when they ran at the same time one
removed or rewrote the other's horizon.toml and
writes_properties_and_syncs_back failed now and then. The settings test
now has its own folder.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
#235 made Game::capture read the surface size, warp the pointer to the
window's centre and set the HUD cursor, so the fixture's copy of the method
no longer compiled and verify failed on main. The fixture now stubs
winit's PhysicalPosition/PhysicalSize, Window::inner_size and
set_cursor_position, HudBatch and Game's renderer and cursor, and checks
the recentring: one warp on grab, two on release, the HUD cursor at the
centre, and nothing when releasing an already released pointer.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged. Recentres the cursor like vanilla's MouseHandler.grabMouse/releaseMouse. CI verify and parity passed; Ludovic asked on 10-21 to clear the PR queue autonomously. If the cursor misbehaves on a Wayland compositor, file it and we'll follow up.
🤖 Agent: merged. Reviewed the storage host: keys are one [a-z0-9_.-] segment, ids are [a-z0-9_], and the quota, key cap and per-call write budget all hold. Thanks @Yvonne-Aizawa!
🤖 Agent: merged. pr_ready now checks the touched crates and their dependents instead of the whole workspace; CI keeps its workspace-wide checks. The earlier verify failure was an unrelated supervisor test. Thanks @rdbtCVS!
🤖 Agent: merged after verify and CI parity passed (modpacks-11: Chipped's 11 vines carried as vines; the 11 blockstate errors are gone from the game log).
- Reject a second running mod with an id already in use: two mods
sharing an id would also share capability storage's data_dir,
letting one read, overwrite or delete the other's state.
- Cap storage to 64 keys per mod, not just 4 MiB: zero- or near-zero-
byte values could otherwise flood the directory with files the
byte quota never sees.
- Add a 1 MiB per-call write budget, separate from the 4 MiB on-disk
quota: a loop replacing one key stays under the quota on every
check (the total on disk never grows) while still doing unbounded
synchronous disk I/O per call, which fuel never meters.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
A mod with capability storage gets get(key)/set(key, value)/delete(key),
backed by real files beside horizon-mods/ (.horizon-mod-data/<id>/, 4 MiB
quota per mod). Keys are a single path segment so they can't leave the
mod's own directory. Unlike in-memory mod state, this survives a
cargo-horizon-mod dev reload, since it's keyed by the mod's path and id
rather than its Store.
🤖 Agent: merged after verify passed and a local check on main + #988: chunk_generation, command_exec and mob_ai (the three harnesses that failed in CI on its old head, under load) all pass; modpacks-10's integration ran 301/301. Formations' structures generate from the noise column.
WaterlogWhenReplacingWaterProcessor (16 lists: the bottom pillars of its
villages and outposts) waterlogs a block that can be where the world holds
water, makes it dry where it does not, and gives a block placed in water a
block tick. Carry used to drop it; it is now the game's
horizon:waterlog_in_world_water, in the chunk being generated as the mod's.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed, security-1's dry runs on the branch, and an independent review whose findings were all fixed. Every release goes out as a beta and is promoted to stable after 6 hours if its smoke test passed and no release-blocker issue is open; launcher-v0.14.0 (stable by default) is already out.
🤖 Agent: merged after verify passed, security-1's dry runs on the branch, and an independent review whose findings were all fixed. CODEOWNERS for the release pipeline and update code. The protection itself (tools/ci/protect_pipeline.sh --apply) waits for the switch to the GitHub App.
🤖 Agent: merged after verify passed, security-1's dry runs on the branch, and an independent review whose findings were all fixed. docs/security.md: the security model in plain words, with what is live and what still waits.
🤖 Agent: merged after verify passed, security-1's dry runs on the branch, and an independent review whose findings were all fixed. Release builds on the Mac mini start from a clean checkout.
🤖 Agent: merged after verify passed (docs and website only; the site build fails on broken links, anchors or images). The README is a shorter front page that links to the new docs.
🤖 Agent: merged after verify passed (docs and website only; the site build fails on broken links, anchors or images). The website gets a Docs section with 11 pages; /server redirects to /docs/hosting.
One-paragraph pitch, download and install, what works today with links to the
site's documentation, hosting and modpacks in two lines each, then build from
source, contributing and the project status table (moved lower, unchanged in
form so the site and tests/test_parity.py still read it). The stale release
notes section and launcher version are gone: the release notes are linked.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
/docs has a left navigation and eleven pages written for players first, then
hosters, then contributors: what Horizon is, install, settings, multiplayer,
logs and bug reports, hosting (the launcher's Servers page and the command
line), modpacks, mods and data packs, performance, contributing and the FAQ.
/server redirects to /docs/hosting. The build checks every link between the
pages and every image.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed (74 + 9 + 1 launcher tests; launcher-only). The Servers page: create, start/stop, players, settings, backups, updates, run at login, and Friends over the internet with Tailscale (device sharing, an optional rule limiting shared friends to the game port, never Funnel). Ludovic's real-tailnet check is described in the PR.
🤖 Agent: merged after verify passed (launcher-only; no parity harness depends on it). The launcher's server backend and `horizon-launcher servers …` CLI.
🤖 Agent: merged after verify and CI parity passed (40 server tests; the whole create → start → join → whitelist → backup → restore → update → stop flow ran on the Mac mini and the ThinkPad). Adds `horizon-server config`, `backups --json`, `update --check --json`; fixes whitelisting on offline servers and updates as root in containers.
repurposed_structures:structure_void_processor returns null for a
template's structure_void blocks, which is what vanilla's block_ignore
does with blocks: [structure_void]. Carry writes it that way, so the
82 lists that use it (its mineshafts, ocean village and temples, the
jungle pyramid's hidden room, swamp village) no longer place structure
voids over the terrain.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
CloseOffAirSourcesProcessor walls off the air and the other liquids beside
a template's fluids, so its ocean mineshafts keep their water in. The game
runs it as horizon:close_off_air_sources (the same weighted blocks and the
mod's random, neighbours written in their sections as the mod does), and
carry maps the mod's 4 uses to it. The weighted block list is shared with
the fluid fix.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A mod's file for a vanilla, convention or other mod's tag adds its values in
load order; one with "replace": true now drops vanilla's entries and the
earlier mods' first, as a higher data pack does, and the log says which mod
replaced what (kept with the cached root, so a reused root warns too).
Carry keeps such tags instead of setting them aside: Towns and Towers'
seven minecraft:has_structure biome tags load. Mods still own no other
minecraft content.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
26.3's EnterBlockTrigger reads a block list from 'blocks' and skips
1.21.1's 'block', so a carried criterion matched any block the player
entered: Regions Unexplored's Downer, From the Tree Tops and Light as a
Frog were granted on the first dive into the sea. Carry renames the
field (20 advancements in Regions Unexplored, with its boat recipes'
in-water criteria).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Without the oracle, a block's template is guessed from its blockstate's
property names, and a vine's (east, north, south, up, west) fit
cobblestone_wall. The game then refused Chipped's 11 vine blockstates:
a wall's sides are none, low or tall, so 'true' is an unknown multipart
property value. block_template looks at the sides' values and makes those
vines; Luminax's 32 walls stay walls.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed and a local check on main + #983 + #984 (clippy clean; chunk_generation and locator_bar, the two harnesses that failed in CI on the old head, both pass; modpacks-10's integration ran 301/301). Structures built under the sea are flooded and waterlogged; Better Ocean Monuments' processors carried.
🤖 Agent: merged after verify passed and a local check on main + #983 + #984 (clippy clean; chunk_generation and locator_bar, the two harnesses that failed in CI on the old head, both pass; modpacks-10's integration ran 301/301). Structures built under the sea are flooded and waterlogged; Better Ocean Monuments' processors carried.
The relative-dimension check teleported the player from the Nether's
80 100 -40 to the overworld's 644 100 -316, fresh ocean chunks at seed 1.
On some runs vanilla broke some of their kelp and seagrass while they
loaded (its chunk loading is asynchronous), which rolled those blocks'
loot tables, so /random reset * later counted 12 or 13 sequences
against Horizon's 11. 1 230 0 in the Nether lands at 12 230 4, terrain
loaded since the start: the scaling is still checked, and 10 runs in a
row pass (5 of the 16 runs before failed this way).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
- A table of what is live, waiting to merge, or waiting for Ludovic, so the page doesn't read as if it all were.
- Forks: their checks need a maintainer's approval, and run-parity runs them on the Mac mini; the Mac mini
section no longer says forks don't run there, and says what a clean release checkout does and doesn't fix.
- Blockers hold every beta while open; releases from before signing stay installable with pinned files.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
What an attacker could do before (instructions hidden in reports, a skipped check that counted as
passed, releases straight to every player, downloads trusting GitHub alone, pipeline files changed
like any other), what stops it now (untrusted text, verify always running, beta then stable,
signed updates, code owners, the agents' own GitHub App), what still needs Ludovic, and what it
doesn't solve. Written for the website's Contributing page; CONTRIBUTING.md links it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Its work folder is shared with pull requests' parity jobs; with clean: false, whatever they left (target/, an
untracked .cargo/config.toml, a build script's output) could end up in a release. release.yml and launcher.yml
now always check out clean; target/ is rebuilt from scratch, and vanilla-data.sh relinks .local/ from its
preparations outside the checkout.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
- backend.rs downloads, installs and self-updates; links.json says where from; launcher/Cargo.toml and
crates/horizon-server/Cargo.toml pick the crates that check downloads.
- protect_pipeline.sh: ludovic111 is the only owner and can't approve his own pull requests, so he is the one
bypass_pull_request_allowances user. enforce_admins stays on, so verify is still required for everyone.
--apply reads the protection back and fails if GitHub didn't keep it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
.github/, tools/ci/, the release tools, the signing crate and the code that checks updates are
Ludovic's to review. tools/ci/protect_pipeline.sh prints (and with --apply sets) main's protection
with code owners' reviews required and no other approvals, keeping the required verify check;
it is for the orchestrator to apply once agents work as the GitHub App.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed. The secret was set first (RELEASE_SIGNING_KEY in the release environment), so the next release is signed with this key.
- A release-blocker issue's text is never read: its author can edit it after a maintainer labels it, so an
open blocker holds every beta, and one closed as completed still holds the betas published before it closed.
- Even --force never promotes a beta that isn't newer than the stable release: horizon-server update and
install.sh download GitHub's latest.
- When the oldest beta newer than the stable release has waited 24 hours, promote.yml opens a "Promotion to
stable has stalled" issue with the last reason; the next promotion closes it.
- promote.yml: persist-credentials: false; issues: write for the stall issue.
- Website: the newest 100 releases, plus GitHub's latest (the stable one) when a day of betas pushes it out.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Game releases go out as betas (GitHub pre-releases, never "latest") with the Mac mini's smoke
report attached. promote.yml (every 30 minutes, or by hand from a phone) runs
tools/release_channels.py, which makes the newest beta stable and latest once it has been out 6
hours, passed its smoke test and no release-blocker issue covers it, with notes rewritten to cover
everything since the last stable release. release_train.py counts merges from the newest release of
either channel, and a beta's notes say it is one.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The private key was generated by tools/ci/new_release_key.sh straight into
the release environment's RELEASE_SIGNING_KEY secret (never on disk or
printed); from now on every release's SHA256SUMS is signed with it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed, with security-1's dry runs on the branch and an independent review (no regression: parity still runs on every PR from this repo; releases go out unsigned with a warning until the signing key is set).
🤖 Agent: merged after verify passed, with security-1's dry runs on the branch and an independent review (no regression: parity still runs on every PR from this repo; releases go out unsigned with a warning until the signing key is set).
🤖 Agent: merged after verify passed, with security-1's dry runs on the branch and an independent review (no regression: parity still runs on every PR from this repo; releases go out unsigned with a warning until the signing key is set).
As root in a user namespace (an unprivileged LXC or rootless container), GNU tar
keeps the archive's owners by default and fails on IDs it can't map, so the update
stopped at "tar couldn't unpack". Found driving the launcher's Update now from one.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify and CI parity passed, plus modpacks-10's local integration (parity 301/301, structure-start oracle 150/150 and 134/134). Towns and Towers' namespaces carried in its manifest.
🤖 Agent: merged after verify and CI parity passed, plus modpacks-10's local integration (all nine branches on main: parity 301/301, structure-start oracle 150/150 and 134/134). Content mods may own namespaces besides their id; two mods may not share one.
🤖 Agent: merged after verify and CI parity passed, plus modpacks-10's local integration (all nine branches on main: parity 301/301, structure-start oracle 150/150 and 134/134). Mod loot tables from every namespace, so modded structure chests are filled.
The render thread summarized every observed chunk (256 columns, seven
light reads per block) and gathered each mesh job's inputs (neighbour
edges, visited columns, cloned spans) itself, within a budget of about
1 ms and 2 ms a frame but at least one chunk or tile: a large tile or a
chunk on a slow machine still cost tens of milliseconds in one frame.
Both now run on the far-terrain worker. Lod::observe hands the chunk
over (the latest per column, queued once), and the worker returns its
summary with its reductions (Done::Observed): an unchanged one is
dropped, a new one is kept and applied as a reduction was. A mesh job
takes a snapshot of the active tiles, their samples and the visited
summaries (Arc maps, cheap to clone) and gathers every tile's inputs
on the worker, as it did before inputs moved to the render thread.
At most OBSERVE_AHEAD resident chunks wait at once, since an edit
copies a chunk the worker still holds.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
1.21.1 read a {min, max} without a type as a uniform number provider; 26.3
dispatches on type alone. The game read such rolls and counts as 0, so
chests of 304 carried ATM10 tables (When Dungeons Arise 140, Repurposed
Structures 50, Structory and its towers 78, ...) came out empty or short.
Carry now types them in pools (rolls, bonus_rolls) and in the functions
that take one, nested bounds too; ranges such as limit_count's and item
predicates' counts stay ranges.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed and CI parity passed on the stack head (#995; local 98/98). perf-frame-9's terrain LOD follow-ups: band and black cliffs fixed, far quads −36 %, per-frame budgets, LOD cap on non-Apple integrated GPUs. LODs off matches main (screenshots, FPS).
🤖 Agent: merged after verify passed and CI parity passed on the stack head (#995; local 98/98). perf-frame-9's terrain LOD follow-ups: band and black cliffs fixed, far quads −36 %, per-frame budgets, LOD cap on non-Apple integrated GPUs. LODs off matches main (screenshots, FPS).
ring writes Ed25519 keys as PKCS#8 v2 (with the public key), which Ubuntu's OpenSSL 3.0 refuses
("unsupported"); verify caught it on ubuntu-latest. keygen now writes v1, the 32-byte seed alone,
checked to give the same public key as ring's document.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed and CI parity passed on the stack head (#995; local 98/98). perf-frame-9's terrain LOD follow-ups: band and black cliffs fixed, far quads −36 %, per-frame budgets, LOD cap on non-Apple integrated GPUs. LODs off matches main (screenshots, FPS).
🤖 Agent: merged after verify passed and CI parity passed on the stack head (#995; local 98/98). perf-frame-9's terrain LOD follow-ups: band and black cliffs fixed, far quads −36 %, per-frame budgets, LOD cap on non-Apple integrated GPUs. LODs off matches main (screenshots, FPS).
The game resolves names as vanilla does, Mojang first, so on an offline server a name someone owns got that
account's UUID and the player, who joins under the offline UUID, was refused. horizon-server now writes the
offline entry and has the game reload the whitelist.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Any repository code running earlier in the job that holds the key could reach it (a build patched
through Cargo.toml, or a step writing $GITHUB_ENV or $GITHUB_PATH for the next one). The `sign`
job checks out only tools/ci/sign_release.sh, which signs with the runner's OpenSSL; the publish
job, without the key, checks the result with horizon-release-sign as launchers will.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Game releases now go out as betas and become stable 6 hours later (promote.yml). The launcher
installs new versions from the stable channel unless "Beta builds" is on in Settings; turning it
on checks again at once. The Versions page, `versions` and the MCP server show each build's
channel. The website's patch notes list stable releases only.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
crates/horizon-release-sign signs a release's checksums with an Ed25519 key that exists only as a
secret of the `release` environment, and checks them as launchers will, against the public keys
built in from release-keys.txt. Dry runs sign with a throwaway key. Until release-keys.txt lists a
key, releases keep going out with SHA256SUMS alone and a warning; once it does, a missing or
unknown key fails the release before anything is published. tools/ci/new_release_key.sh pipes a
new key straight into the secret and prints only the public key. ring and base64 are already in
the lockfile.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Labels started `checks` runs whose verify job was skipped, and GitHub counts a skipped required
check as passed: auto-merge merged #823 and #837 before the real verify finished. Labels no longer
start `checks` (the fork-only run-parity label has its own workflow), and verify has no condition.
The parity job moves into a reusable workflow both call.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed and local parity (perf-server-12: `tools/parity.py --changed origin/main` 98/98 with the three branches together, sculk / natural_spawn / spawn_rules harnesses pass; before/after numbers in the PR). CI parity was still queued on a busy runner.
🤖 Agent: merged after verify passed and local parity (perf-server-12: `tools/parity.py --changed origin/main` 98/98 with the three branches together, sculk / natural_spawn / spawn_rules harnesses pass; before/after numbers in the PR). CI parity was still queued on a busy runner.
horizon_launcher::servers keeps the list of servers and drives horizon-server
for them: create (init, then config set), start, stop, backups, settings, the
service, and the running supervisor's control API for the live status, the log
and console commands. The programs come from an installed, prepared version,
laid out as install.sh does (server-runtime/releases, current, game-files), so
horizon-server update and its rollback work on them unchanged; the game files
are a copy of the player's own prepared files.
Problems come back in plain words with the fix to offer (a busy port with a
free one, missing game files with Prepare, the EULA).
horizon-launcher servers list|create|set-up|run|forget does the same from a
terminal.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
`config [--json]` prints the settings; `config set KEY=VALUE...` writes them through
toml_edit, checked as server.toml is checked (nothing is written if one is wrong). A
running server takes the difficulty, the default game mode and the whitelist at once
through its console, and the backup settings because the supervisor reads them each
time; the rest waits for the next start, and the command says which.
Also `backups --json` and `update --check --json`, for the launcher's Servers page.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed; cloud_render, environment_render, weather_render and 923 client tests pass, with before/after screenshots of Complementary Unbound. Java shader packs get real eye brightness, custom uniforms, Iris's sun path and tilt, and clouds=off/sun/moon flags. Part of #944 (reported by brabus_); shadows and gbuffers still to come.
🤖 Agent: merged after the verify rerun passed (the first run's failure was a flake; horizon-server tests pass 39/39 locally) and CI parity passed. Old releases are pruned automatically after an update.
🤖 Agent: merged after verify and CI parity passed (modpacks-10, reviewed with local harness proof in the agent's report). Carries Formations' structures.
🤖 Agent: merged after verify and CI parity passed (modpacks-10, reviewed with local harness proof in the agent's report). Carries the mods' pillar and fluid-fix processors in ported packs.
🤖 Agent: merged after verify and CI parity passed (modpacks-10, reviewed with local harness proof in the agent's report). Structure pillars and fluid fixes placed outside the template, like the mods do.
🤖 Agent: merged after verify passed and the HUD harness with new §-coded cases (34/220 on main → all pass). The sidebar applies § formatting codes like vanilla. Fixes#937.
🤖 Agent: merged after verify passed and local proof (menu_click fails on main 7978/8000, passes with the fix; place_recipe passes). The player's armour equip sound and event follow every vanilla path. Fixes#986 (reported by famescare).
Complementary Unbound drew clouds and light shafts inside terrain and a
second sun because the full-screen passes got wrong inputs:
- eyeBrightness was a constant (0, 240), so packs saw open sky
underground. It is now the block and sky light of the camera entity's
eye block (CommonUniforms.getEyeBrightness), and eyeBrightnessSmooth
follows it with the pack's eyeBrightnessHalflife (SmoothedFloat).
- Custom uniforms (uniform.* / variable.* in shaders.properties) were all
0: Complementary's eyeBrightnessM, isEyeInCave, starter, framemod8 and
the rest. horizon-shaderpack's uniforms.rs parses and evaluates them
each frame like Iris (stareval priorities, IrisFunctions, SmoothFloat).
- sunPosition, moonPosition, shadowLightPosition, sunAngle and
shadowAngle now follow CelestialUniforms: the sky's sun and moon angles
turned by Y -90, the pack's sunPathRotation about Z, then the angle. The
old sun vector pointed north-south instead of east-west.
- While a Java pack runs, sunPathRotation tilts Horizon's sun, moon and
stars as Iris tilts vanilla's, and clouds = off | fast | fancy, sun and
moon = false apply. Complementary and Sildur's set clouds = off; the
vanilla clouds Horizon drew anyway wrote depth the packs' light shafts
and fog took for terrain.
Fixes#944
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged, thanks Online5277! Ludovic decided: Classic menus by default for fresh profiles (saved choices and HORIZON_MENU_STYLE still win). We merged current main in; fmt, clippy -D warnings and 1,022 client tests pass, and verify passes. Fixes#548.
VanillaPlaceRecipeOracle prints VanillaMenuOracle.state, so the equips
field the menu_click harness compares broke its lines. Only the
menu_click oracle's own lines carry it now.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
LivingEntity.onEquipItem now runs for the player wherever vanilla calls
it: the inventory menu's ArmorSlot and off-hand slot (setByPlayer, in the
menu engine, so clicks, shift-clicks, number keys, drags and LAN guests'
clicks), right-click equipping (Equippable.swapWithEquipmentSlot), the
creative screen (every changed slot, as handleSetCreativeModeSlot sets it),
the swap-hands key, dispensers (now also a shield into the off hand) and
/item and /loot on armour slots. It plays Equippable.equipSound (the
generic armour sound by default) on PLAYERS when the item lands in its own
slot, and emits equip/unequip game events for armour; nothing for
spectators, on a client, or when the item is unchanged.
The menu click harness's oracle now records vanilla's onEquipItem calls.
Fixes#986
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Vanilla's Font draws every literal through StringDecomposer.iterateFormatted:
a § code styles what follows and is not drawn, a lone trailing § is
dropped. The sidebar drew owner names, team affixes, scores and the title
raw, so servers' sidebars showed § and the code letters. They now go
through Text::resolve_legacy, as the tab list already does.
The HUD harness's sidebar cases gain legacy-coded owners, affixes, titles
and fixed score formats.
Fixes#937
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed. Remote players' projectiles record their owner: ender pearls teleport and hurt the thrower, mobs target the shooter; docs/server.md row updated; part of #484.
🤖 Agent: merged after verify passed. A remote player's item used on a block is used once (a snowball thrown at the ground flew 2× main hand / 3× off hand); part of #484.
🤖 Agent: merged after verify passed. Chat commands from a dead player run, as in vanilla's handleChatCommand (fixes#973); dedicated_server transcript 604/604 lines identical.
A projectile a guest shot was recorded as the local player's (Who::Player), which on a
server means the host, or nobody on a dedicated server. So a guest's ender pearl
teleported the host on a LAN world and did nothing on a dedicated server, what it hit
answered to the host, and clients were told the projectile had no owner.
Projectiles now remember the guest who shot them (Projectile.guest, set when the
guest's turn ends). Clients get the guest as the owner (Projectile.getAddEntityPacket),
and the hit runs as that guest: their pearl teleports and hurts them, and the mob hit
answers to them. ThrownEnderpearl's endermite also needs monsters to spawn, and comes
where the player was.
The dedicated-server harness checks that the snowballs' owner is the player and throws
an ender pearl at the player's feet: vanilla teleports it and takes 5 health, main did
neither.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A vanilla client sends a right click as one packet per hand and part
(Minecraft.startUseItem): UseItemOn for the block's part and ItemStack.useOn, then
UseItem for Item.use when that passed, the main hand first. The server ran the whole
click, both hands, for UseItemOn, then the item again for UseItem: a snowball thrown
at the ground flew twice, three times from the off hand.
Each packet now does its own part with its own hand
(ServerGamePacketListenerImpl.handleUseItemOn / handleUseItem): UseItemOn stops at
useOn (no throwing, drinking, eating, raising, equipping, buckets or an ender eye off a
frame), and neither touches entities (Interact does). Horizon's own client, which
counted on the server trying the off hand, now sends the off hand's packets when the
main hand's use passes, as vanilla's does. UseItem's rotation is the player's now
(absSnapRotationTo) without sending the client a teleport back.
The dedicated-server harness right-clicks the ground with a snowball in the main hand,
then in the off hand, and counts the snowballs against vanilla's (2 and 3 on main,
1 and 1 now).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Player attacks between the host and guests, or two guests, only checked the pvp game
rule. ServerPlayer.canHarmPlayer also asks the victim's team (Player.canHarmPlayer):
an ally on a team with friendlyFire false takes no damage, and the attacker hears the
no-damage sound.
lan_e2e's pvp check puts both players on such a team and checks that neither hurts
the other.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A dead guest's packets were all dropped but the respawn request, so a command typed on
the death screen never ran. ServerGamePacketListenerImpl.handleChatCommand and
handleSignedChatCommand don't look at the player's health: the commands now run.
The dedicated-server harness sends `/trigger nope` from the death screen and compares
the reply with vanilla's before respawning.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
An install kept every release it ever unpacked in releases/. Once the game is up on the
new release (or a stopped server is switched), the update now deletes the old ones,
keeping the release in use, the one `previous` names (rollback's target), the one the
running horizon-server came from, and the `updates.keep` newest of the others (1 by
default, a new server.toml setting). A release that can't be deleted is reported and
left for the next update.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed. If the game crashes natively after its Vulkan adapter line and before its first frame, the launcher switches the Graphics API setting from Auto to DX12 and tells the player; it doesn't relaunch by itself.
🤖 Agent: merged after verify passed. DirectX 12 for Windows: Auto tries Vulkan first and falls back to DX12 when Vulkan has no adapter or its device request fails; Video Settings > Graphics API (Windows only) and HORIZON_GRAPHICS_API override it. We merged main in (kept #771's LOD row and lodDistance next to graphicsApi); clippy -D warnings and 1,021 client tests pass, including the WGSL→HLSL translation of every shader. Not yet run on real Windows hardware.
- Integrated GPUs other than Apple's draw far terrain to 128 chunks at
most, whatever LOD Distance says; its description says so, and the
status reports the distance in use (`lod.effective_distance`).
- On machines with four threads or fewer, far terrain starts no detail and
one sample job per 500 ms while the near terrain loads, so the near
chunks and the frame get the cores first.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
- Upload far meshes within about 2 ms a frame (at least one); the rest
wait, with their removals and the cutout, and apply in order.
- Gather mesh inputs across frames within about 2 ms, from a snapshot of
the active tiles' samples, instead of hundreds at once.
- Select tiles only when the plan, samples, covered columns or dirty tiles
changed; add the covered stand-ins only after a replan.
- Find the tiles touching an invalidated chunk per level, not by scanning
every active tile; share tile samples with mesh jobs (Arc) instead of
cloning them.
- Recompute the full-detail columns only when their completeness, the
center or the radius changed.
- Observe chunks for the far summaries within about 1 ms a frame (at least
one), unloaded ones first, with each block state's kind read once instead
of matching block names per block.
LODs off is unchanged: none of this runs without far terrain.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Far tiles mesh every gap in their columns: caves and aquifers in visited and
refined chunks, and the gaps kelp and seagrass leave in water. Most are closed
on every side, so their floors, ceilings and walls cost vertices and never
show.
Before meshing, a tile fills each gap below a column's top that no
neighbouring column's open air looks into (every neighbour's top is at or
above the gap's top) with the material below it, or with the fluid above it
(kelp in water). Cave mouths stay open; unknown neighbours and cells meeting
full-detail or finer terrain count as open.
Seed 1234, RD12, LOD 64, overview: 4.93 M to 3.17 M far-terrain quads.
Follow-up to Online5277's terrain LODs (#771).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Full-detail sections leaving the render distance stopped being drawn at once,
while the distant tiles still left their columns out until the next mesh job
finished: for a few seconds after moving (longer on slow machines) a hole
opened there, lined with the tiles' seal walls. Those took the light recorded
for buried blocks, none, so the hole showed as a dark band.
Lod::take_cutout hands the renderer the columns the finished meshes leave
out. Their resident sections stay drawn, even past the render distance, and
sections unloaded while still left out are released only once the tiles
cover them. With LODs off the cutout is empty and nothing changes.
Side faces above the top of the column they face open onto air. Reduced
columns and the seals expose sides that were buried, so those parts take at
least the sky light over that top (black cliffs in far tiles). Faces into a
cave keep their recorded light.
Follow-up to Online5277's terrain LODs (#771).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed and CI parity passed 322/323; the one failure, dedicated_server (two extra block updates at respawn, a server-only path this GPU change can't reach), passed 2/2 locally on main + this PR and 2/2 on main. Vendors wgpu-hal 30.0.1 with the upstream fix for gfx-rs/wgpu#9845; should fix#746 on HD 520/530, to be confirmed by the reporters on the release.
🤖 Agent: merged after verify passed (benchmark data and docs only). Four-way equal-work benchmark: Horizon uses 3.8–4.8× less RAM and starts in ~8 s; Paper's average tick is shorter at every count, which is now perf work.
Its formations:simple becomes the game's horizon:formations (its pool and
placement), and its single pool element vanilla's with its ground_level
under horizon:ground_level. Its pieced structure (one) stays out; its
processors are still dropped.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The structure context gets ChunkGenerator.getBaseColumn's blocks
(StartContext::noise_column: air, water, lava, solid or other, from the
noise's minimum Y, air past its ends), which Formations' placements test.
horizon:formations is Formations' SimpleStructure: one element of its pool
at a random spot of the chunk and rotation, at the height its placement
finds under the element's corners and centre (surface, ceiling, on water
or lava, in caves on the floor, under the ceiling, buried, on lava), as
the mod draws and checks them. Single pool elements take a ground level
(`horizon:ground_level`, 1 by default as vanilla's), which moves the piece
and its terrain adaptation as Formations' does.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed. The site's nav links Host a server; README gains a hosting paragraph; tools/server.py and docs/server-quickstart.txt retired.
🤖 Agent: merged after verify and CI parity passed. horizon-server update (SHA-256 check, world backup, switch, health wait, automatic rollback) and rollback; 6-hourly update notice in log, status and panel. Proven end to end on the Mac mini and the ThinkPad (healthy update, crash rollback, timeout rollback, manual rollback, real GitHub download); 37 unit tests.
Better Ocean Monuments' ten processors (no fields; their behaviour is in
its Java) become vanilla's rule, the game's horizon:pick (one new
nextFloat per chance), horizon:flood_air, horizon:waterlog,
horizon:keep_world_block and horizon:yung_pillar; Better Witch Huts' log
and fence legs become horizon:yung_pillar. Its monuments are no longer
dry.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Repurposed Structures' and Moog's pillar_processor, Repurposed's
bottom_pillar_processor and close_off_fluid_sources_processor, YUNG's
pillar_processor (Better Fortresses, Better Jungle Temples) and Better
Fortresses' stair_pillar_processor become the game's horizon:pillar,
horizon:bottom_pillar, horizon:close_off_fluid_sources,
horizon:yung_pillar and horizon:stair_pillar. A pillar's own processor
list is written in, with the Java processors in it dropped.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Towns and Towers ships its 60 structures under kaisyn and towns_and_towers,
not its mod id t_and_t, so carry left them outside. A namespace is now the
mod's when its own files (its id's, its tag additions, the namespaces
already claimed) name ids in it and no mod of the pack has it as its id.
Compat files for other mods and pack mods' configs stay outside; of ATM10's
42 jars only T&T claims any. A replacing tag of its own is an addition.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Adds the game's side of Better Ocean Monuments' Java processors:
- horizon:flood_air: the template's air below sea level becomes water
(its AirProcessor; the monuments' templates are mostly air, so they
stood dry);
- horizon:waterlog: below sea level, blocks that can be waterlogged are,
and water and lava on the edge of the chunk being generated are marked
for postprocessing (its WaterlogProcessor);
- horizon:keep_world_block: a placeholder takes the world's block (its
StructureVoidProcessor);
- horizon:pick gains `redraw` (a new nextFloat for each chance, as its
random processors draw) and `keep_properties` (Block.withPropertiesOf,
for its copper stairs and slabs);
- horizon:yung_pillar gains `keep_properties`, for Better Witch Huts'
fence legs.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A content mod's manifest may list namespaces its files use besides its id
(Towns and Towers ships kaisyn and towns_and_towers under mod id t_and_t).
They are the mod's as its id is: files load, loaders read them. minecraft,
c and horizon cannot be listed. Two mods that are on owning one namespace
is an error naming both; the game keeps the first and leaves the other's
content out.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The loot loader read data/minecraft/ only, so every chest in a carried
mod's structure that names its mod's loot table opened empty. It now reads
every namespace (a vanilla root has only minecraft). Integers written as
floats (rolls 3.0, as Towns and Towers writes them) read as vanilla's int
codecs read them. 534 of the 675 non-block tables in ATM10's carried mods
now fill a chest; vanilla's chest fills are byte-identical.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Adds the game's side of the mods' Java processors that write blocks around
a structure while its template is processed:
- horizon:pillar and horizon:bottom_pillar: Repurposed Structures' and
Moog's PillarProcessor and BottomPillarProcessor, a column from a trigger
block (or the bottom layer) down to the ground, with their nested lists
and Moog's height randomizer;
- horizon:close_off_fluid_sources: their fluid fix, which walls off source
blocks next to the structure's open blocks;
- horizon:yung_pillar and horizon:stair_pillar: YUNG's PillarProcessor
(Better Fortresses, Better Jungle Temples) and Better Fortresses' stair
supports.
They write through PlacementContext::set_chunk_block, the
ProtoChunk.setBlockState the mods call (heightmaps kept), and only inside
the chunk being generated, as the mods check WorldGenRegion's centre.
Processor lists nested in pillars are capped at 16 levels.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify and CI parity passed, and a combined check with rdbt's #796 on current main (fmt, clippy, 359 tests, 14 world-gen harnesses). YUNG/Moog terrain adaptation around structures (Better Fortresses netherrack inside bridges 39–41 % → 2.5–7 %), its carry, and YUNG modifiers.
🤖 Agent: merged after verify and CI parity passed, and a combined check with rdbt's #796 on current main (fmt, clippy, 359 tests, 14 world-gen harnesses). YUNG/Moog terrain adaptation around structures (Better Fortresses netherrack inside bridges 39–41 % → 2.5–7 %), its carry, and YUNG modifiers.
🤖 Agent: merged after verify and CI parity passed, and a combined check with rdbt's #796 on current main (fmt, clippy, 359 tests, 14 world-gen harnesses). YUNG/Moog terrain adaptation around structures (Better Fortresses netherrack inside bridges 39–41 % → 2.5–7 %), its carry, and YUNG modifiers.
🤖 Agent: merged, thanks rdbt! Bulk density arithmetic, the shared Beardifier kernel and Perlin column reuse: 12.685 → 10.069 ms/chunk Overworld terrain (−20.6 %, one worker). We merged current main in (density/tests.rs: kept both test sets) and checked it together with #955/#956/#959: fmt, clippy -D warnings, 359 core/world/port-pack tests, and 14 world-gen harnesses (density, noise, structure_density, server_world_gen, world_spawn, decorated_region, …) all pass.
🤖 Agent: merged after verify passed. The renderer logs each start-up step once per device (driver, requested features and limits, surface, pipelines, first acquire/submit/present), so a native crash's last log line names the step.
🤖 Agent: merged, thanks Online5277! Terrain LOD lands off by default. With LODs off it matches main (0 differing pixels in 6 RD16 views, same FPS/GPU ms on the HD 620, same time to full render distance); CI verify and parity pass. We merged main in three times and adapted it to #905/#939 and the packed texture coordinates. The follow-ups from the review (edge band, integrated-GPU cost, lighter far meshes) we're taking on ourselves.
A native crash in a graphics driver leaves no crash report, only the game's
last lines. When the game ends with no report after its Vulkan adapter line and
before its first frame (Windows only), set graphicsApi:dx12 in its graphics
settings (the game home's and the run's own, only where it was auto) and tell
the player to press Play again, instead of the crash notice.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The Windows client builds wgpu's dx12 backend. With graphicsApi:auto (the
default), the renderer opens Vulkan and falls back to DirectX 12 when Vulkan
has no adapter (no Vulkan driver) or its device request fails; vulkan and dx12
pick one (horizon-graphics.txt, Video Settings > Graphics API on Windows, or
HORIZON_GRAPHICS_API; WGPU_BACKEND still overrides). Other systems keep their
one backend.
DirectX 12 keeps wgpu's indirect-draw validation: it is what passes each
draw's first instance to shaders there. Occlusion culling stays Vulkan-only and
flat draws Metal-only, as before; multi-draw and the GPU timer use DirectX 12's
own. gpu-allocator now resolves to the windows crate wgpu-hal's dx12 code
uses (0.62): with cpal's 0.54 it did not compile. A test translates every WGSL
shader to HLSL as the dx12 backend does for FXC.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A native crash in the graphics driver leaves no panic or crash report: the
last log line is all a player can send. After the adapter line, log the
driver, the features and limits the device is requested with, the surface
configuration, the pipelines (with multi-draw, occlusion culling and the GPU
timer on or off) and the first frame's acquire, submit and present, once per
device.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
wgpu 30 creates a Vulkan descriptor pool with no pool sizes while it creates
the device. Vulkan allows that only since 1.3.215; Intel's Windows driver for
6th-10th gen integrated GPUs (igvk64.dll, HD 520/530, UHD 620/630) reads
past the empty array and crashes with 0xc0000005 inside request_device, right
after the game logs its renderer (gfx-rs/wgpu#9845). Apply the upstream fix
(gfx-rs/wgpu#10124: one sampler entry when the pool would be empty), which no
wgpu release has yet, through [patch.crates-io].
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The crates.io sources of wgpu-hal 30.0.1, minus its examples, lock file and
VCS metadata, so the next commit can apply one upstream fix that has no
release yet. Excluded from the workspace: it keeps its own lints.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify passed and local proof (sculk harness). Sculk drops every unloaded chunk's blocks in one pass: worst tick 583–609 → 38–44 ms with 40 bots.
🤖 Agent: merged after verify passed and local proof (heightmap, chunk_stage, lan, …). Chunk-packet heightmaps are built on the warm-up threads; bytes identical; lan_chunks −11–13 %.
🤖 Agent: merged after verify passed and local proof on the integration commit (8 harnesses, lan_e2e both modes). The server thread runs ahead of the workers on macOS and Windows, like vanilla's Thread.setPriority(8): 40 bots tick p99 101.5/77.7 → 32.8/32.7 ms, ticks over 50 ms 166/146 → 1/2.
🤖 Agent: merged after verify passed. The host clears the hazards box, so a dead guest no longer leaves it behind for pvp/hurt (8/10 → 0/3 failures under --server-thread).
🤖 Agent: merged, thanks Online5277! Server chat now goes through the shared chat component, so the wheel and Page Up/Down scroll it. We merged main into the branch (main had moved the atlas to self.gui.atlas); clippy -D warnings, the 6 chat tests and the LAN chat check (both modes) pass, and verify passes. Fixes#810.
🤖 Agent: merged, thanks LookImEcho-Rick! It was still marked draft, but its description was complete and our checks were done, so we marked it ready. /execute in <dimension> now moves the player across dimensions like vanilla (fixes#592). With main merged in and the #947 fix (#962), command_exec, command_parse, server_dimension_players and dedicated_server pass locally, and verify passes. If you meant to add more, a follow-up PR is welcome.
🤖 Agent: merged after verify passed and parity --changed 311/311 locally. Lithostitched apply_random, condition and set_block in the game: CTOV farms grow carrots, potatoes and beetroot, paths and mossy cobblestone appear.
🤖 Agent: merged after verify passed and parity --changed 311/311 locally on the integration commit. YUNG modifiers, piece_in_range and dead-end pools (game side).
🤖 Agent: merged after verify and CI parity passed. The carry reads data files with comments as Minecraft does; six Better Fortresses pools come back (265 → 3,765 pieces over seed 1234's Nether centre).
🤖 Agent: merged after verify passed and local proof on one integration commit of modpacks-9's PRs: parity --changed 311/311, structure-start oracle 3,153/3,153. CI parity's only failure was secure_chat, which this change doesn't touch. Stronghold rings 3/128 off → 0/128 on seeds 1234, 2, 3, 42, -7.
🤖 Agent: merged after verify and CI parity passed (command_exec 764/764 three times locally, 20 affected harnesses). /summon no longer spawns other pending entities and takes their id; the harness settle waits for entities like vanilla's. Fixes#947.
tools/server.py and docs/server-quickstart.txt are gone (horizon-server replaces them);
build_release.py builds only the client starter, and the docs point to docs/hosting.md.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The void can kill the guest before the hazards check tidies its stone box,
and the LAN server drops a dead guest's packets, so the box stayed: the
guest suffocated in it during pvp, and the hurt check's pig with it. The
host runs the tidying fills instead.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
MinecraftServer.spin raises its server thread (Thread.setPriority(8)) when
there are more than four processors. The new horizon-threads crate makes the
same request for the dedicated server's thread and the integrated server's:
user-interactive QoS on macOS, above-normal priority on Windows, nothing on
Linux (an unprivileged thread can't raise itself).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
`horizon-server run --dir srv` (what init prints) started the game in srv/ with
--control-socket srv/.horizon/engine.json, which the game resolved inside srv/,
so it crashed at every start. spawn now passes absolute paths.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A Vega 11 on Windows (Vulkan) panicked at launch in bytemuck's cast_slice
with TargetAlignmentGreaterAndInputNotAligned, starting with the release
that shipped occlusion culling. The section-test results and the GPU
timer's timestamps were cast in place from the mapped range, which isn't
guaranteed to be 4- or 8-byte aligned. Copy the words out instead.
Fixes#953
Co-Authored-By: Claude Opus 5.5 <[email protected]>
apply_random becomes horizon:apply_random: its weighted lists, or its set
of lists at weight 1, with the inline lists carried like any other (their
Java processors dropped and counted). condition becomes horizon:condition
when the game runs every condition in it (true, all_of, any_of, not,
random_chance, matching_blocks with plain property values), with its then
and else lists carried. set_block with a simple or weighted state provider
and no block entity change becomes horizon:set_block. Anything else stays
Java and is dropped as before.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
horizon:apply_random runs one processor list drawn by weight
(WeightedList.getRandom); horizon:condition runs `then` or `else` by a
test of the block (true, all_of, any_of, not, random_chance and
matching_blocks on the placed or the existing block). Both take their
random from Lithostitched's RandomSettings: seeded with the world seed
plus the name's hash, forked positionally at the block, the piece or the
structure's pivot. process_block now gets the piece's position for it.
horizon:set_block is Lithostitched's set_block with a simple or weighted
state provider: the block becomes the state (drawn at the chosen position
from the unsalted seed), keeping the properties it shares with the old one
unless preserve_state is off.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged, thanks rdbt! Terrain sampler scratch buffers are reused between chunks; byte-identical output across the 22 world-gen parity harnesses on the combined commit.
🤖 Agent: merged, thanks rdbt! Spectator scroll-wheel flight speed now follows vanilla (6,791 oracle cases); verified on the combined commit with local_input and the client tests. Fixes#945.
lithostitched:reference runs the processors of other lists in turn.
Carry now writes their processors in its place, in order and references
in them too, from the mod's own processor lists. A reference to a tag or
to a list the mod lacks stays, and is dropped and counted as before.
ChoiceTheorem's Overhauled Village builds most of its lists this way.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Lod::update sorted every unsampled plan node each frame to take at most
four (none while every sample slot is busy), and woke the workers every
frame. It now skips the selection while the slots are full, keeps only
the best 2 * (SAMPLE_JOBS + pending) entries before sorting (a key is
listed at most twice, so the same tiles are taken in the same order),
takes the best fallback with min(), and wakes the workers only when a job
was queued. A finished chunk's detail now goes straight to the tile at
each level 0-4 holding it instead of scanning every ready tile (the others
never overlapped it).
Mac mini, RD12, LOD 256 while far terrain generates, `sample` of the main
thread over 30 s, alternating: Lod::update 10.4 % and 12.3 % of the
samples before, 3.4 % and 3.5 % after; update_world 3497 and 3373
samples before, 668 and 864 after.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
YUNG's API and MoogsStructureLib add their own kernel to the Beardifier:
a size and falloff of its own, carving or burying above and below a piece's
floor, around rigid pieces and junctions. Better Strongholds buries its
stronghold, Better Fortresses carves the netherrack over its bridges and
Moog's mega fortress carves a band around its corridors. A structure or a
pool element holding `horizon:enhanced_terrain_adaptation` now gets that
kernel (horizon_core's TerrainKernel), summed after vanilla's density as
the libraries' mixins do; YUNG's also grows the start's box by its radius.
Vanilla data never has the key, so vanilla worlds are unchanged.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Better Nether Fortresses relies on three parts of YUNG's API the game did
not have:
- piece_in_range: another piece (of some templates, or any) inside the
piece's box grown sideways, below and above.
- Modifiers, applied once the layout is done, in piece order and with the
assembler's random: a condition, then actions on the piece itself.
transform swaps its template for one picked by setFeatureSeed(x, y, x)
and moves it by an offset turned with the piece; delay_generation moves
it to the end of the piece list.
- Dead-end pools: a piece that got no child though it has other jigsaws
is taken out (its parent's junction, its room and its count given back)
and a piece of its dead-end pool is chosen for the same parent jigsaw.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Minecraft reads data JSON with Gson's lenient reader, which skips `//`,
`#` and `/* */` comments. Six of YUNG's template pools have them (Better
Fortresses' bridges, halls and hall ends; Better Jungle Temples' floors),
so carry refused them as unreadable and the structures lost those pieces:
seed 1234's seven Better Fortresses had 265 pieces in all, now 3,765, and
five Better Jungle Temples 170, now 196. A file that parses once its
comments are gone is carried as plain JSON.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ChunkGeneratorStructureState's ring searches call findBiomeHorizontal,
which samples its 57x57 quarts in order through one resolver; vanilla's
climate index starts each lookup from the previous result and keeps it on
a tie. Horizon built a fresh resolver for every quart, so ties went the
other way: three of seed 1234's 128 strongholds were up to 6 chunks off
(the first one 96 blocks from vanilla's). StartContext::noise_biomes
samples a batch through one resolver and the search hands it the square.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
YUNG's single elements keep their dead-end pool and their modifiers under
horizon:yungsapi, which the game's assembler now reads: the modifier's
condition, and its transform and delay_generation actions on the piece
itself. piece_in_range carries as is. A modifier aimed at another target
than self, or another action, is counted lost.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
YUNG's API's `enhanced_terrain_adaptation` (its presets spelled out, NONE
as size 0) and MoogsStructureLib's (with its band) were counted lost. Carry
now writes them as `horizon:enhanced_terrain_adaptation` on the structure
and on the pool elements that have their own: YUNG's with every piece's
junctions and the start's box grown by the radius, Moog's with only the
terrain-matching pieces' junctions, as each library does.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged after verify and CI parity passed. tick_blocks finds the motion-blocking height from the top of the terrain: 1.98 → 1.36 ms per tick with 10 bots on the Mac mini (−31%).
🤖 Agent: merged after verify and CI parity passed. Non-living entities (TNT, falling blocks, boats, frames…) now tick only in entity-ticking chunks, as in vanilla.
🤖 Agent: merged after verify and CI parity passed; 301/301 harnesses locally on the combination with #951/#952. Dedicated servers now spawn mobs around every player (0 → ~70 per bot, 139–144 for two, matching vanilla's caps).
Coming back to a level, the entities saved with its chunks wait in
World::loaded_entities until the next tick spawns them, as vanilla's
PersistentEntitySectionManager.processPendingLoads does. /summon pushed its
compound onto that queue and drained all of it, so the first waiting
entity took the id counted as the summon's root: after a Nether round trip
`/summon minecraft:armor_stand ...` reported "Summoned new Pig". Summon now
spawns only its own stack and leaves the queue to the tick.
The command harness's settle now waits for the entities of the chunks
around the player as well, like the oracle's settle
(areEntitiesActuallyLoadedAndTicking), and a `portal` op sends the player
through the nether portal it stands in (Entity.handlePortal:
NetherPortalBlock.getPortalDestination, teleportToPortalDestination). The
corpus's new `levels` group makes the round trip and checks the Overworld's
pig and a summon's feedback on the way back.
Fixes#947
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The soft 4 ms yield per frame (also with Unlimited budgets) made a saved
RD32 world reach full render distance about 1 s later on the Mac mini
(streaming time after launch, 4 alternating pairs: main 1.9 s mean, yield
2.8 s; t100 from a first batch of 3 pairs: 6.1 s vs 7.1 s) without better
loading frame times (max 133-210 ms vs 31-150 ms). Without a budget every
finished mesh uploads at once again, as on main. The budgeted path keeps
this branch's fixes: only loaded chunks' sections wait, and sizes count the
24-byte terrain vertex.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: thanks rdbt! Verify passes. A per-worker memo of the carver biome lookups in front of the shared mutex: the resolved biome per origin is a pure function of seed, dimension and position, so results can't change, and the test checks eviction leaves the terrain identical. Paired benchmarks: +3.3–3.9 % terrain throughput at six workers (16 pairs, two sites), up to +5.9 % at size 32, no single-worker regression.
getHeightmapPos(MOTION_BLOCKING) walked every column from y 319 down,
one block lookup per y. Each precipitation roll (3 in 48 per ticking
chunk per tick) and each isRainingAt paid for it: with the chunks of 10
players ticking it was most of tick_blocks. Only air lies above the
WORLD_SURFACE heightmap the chunk already keeps, and air neither blocks
motion nor holds a fluid, so the scan starts there. LevelAccess gains
world_surface (the build limit by default, so other levels scan as before).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ServerLevel.tick ticks an entity only where the chunk tickets make it
entity ticking (inEntityTickingRange, and EntityTickList holds only the
entities of entity-ticking chunks). Mobs, items and minecarts already
checked it (#931); these six entity kinds ticked wherever they were
loaded, so TNT went off and sand fell past the simulation distance.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Natural spawning returned without a local player, so a dedicated or
--server-thread server spawned no mobs and a LAN host spawned them only
around itself. ServerChunkCache.tickChunks now takes its spawning chunks
from every player in the level (ChunkMap.collectSpawningChunks), the
global caps from the natural spawn chunk tracker's size, and the local
caps from each player (LocalMobCapCalculator). Inhabited time and
thunder follow the same chunks (tickSpawningChunk), the wandering trader
picks a random living player (getRandomPlayer), and mobs despawn by
their distance to the nearest non-spectator of any kind.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
main's #880 added Source::level and Source::elsewhere for server players
teleported into another level; this branch adds Source::dimension and
moves the local player. Kept dimension (it covers what elsewhere was read
for) and level; /tp tries main's teleport_across for a server's players
first, then this branch's local-player level switch.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: reviewed; verify passes. Ports removeWhenFarAway = false for Villager, WanderingTrader and AbstractGolem (iron/snow/copper golems, shulkers). Seed 1234 plains village: main 0 villagers, this PR 14, vanilla 26.3 server 14. 95/96 affected harnesses pass; world_spawn timed out on a busy machine, then 59/60 seeds alone (the one off is the known chunk-order flake #308). Fixes#917.
🤖 Agent: reviewed; verify passes. Re-checked all four perf-server-10 PRs merged on current main (after #887#931#912#916): fmt/clippy clean, horizon-client tests 893 passed, lan, dedicated_server, server_world_gen, chunk_stage, world_reopen, server_entities, server_player_targets, server_dimension_players pass, lan_e2e growth/plates/eating/hurt/chat/light pass in both modes (eating with --server-thread failed once in the long sequence, then passed twice alone). Numbers in the PR.
🤖 Agent: reviewed; verify passes. Re-checked all four perf-server-10 PRs merged on current main (after #887#931#912#916): fmt/clippy clean, horizon-client tests 893 passed, lan, dedicated_server, server_world_gen, chunk_stage, world_reopen, server_entities, server_player_targets, server_dimension_players pass, lan_e2e growth/plates/eating/hurt/chat/light pass in both modes (eating with --server-thread failed once in the long sequence, then passed twice alone). Numbers in the PR.
🤖 Agent: reviewed; verify passes. Re-checked all four perf-server-10 PRs merged on current main (after #887#931#912#916): fmt/clippy clean, horizon-client tests 893 passed, lan, dedicated_server, server_world_gen, chunk_stage, world_reopen, server_entities, server_player_targets, server_dimension_players pass, lan_e2e growth/plates/eating/hurt/chat/light pass in both modes (eating with --server-thread failed once in the long sequence, then passed twice alone). Numbers in the PR.
🤖 Agent: reviewed; verify passes. Re-checked all four perf-server-10 PRs merged on current main (after #887#931#912#916): fmt/clippy clean, horizon-client tests 893 passed, lan, dedicated_server, server_world_gen, chunk_stage, world_reopen, server_entities, server_player_targets, server_dimension_players pass, lan_e2e growth/plates/eating/hurt/chat/light pass in both modes (eating with --server-thread failed once in the long sequence, then passed twice alone). Numbers in the PR.
Sections arrive back to front (visible is sorted by distance, then key), so
the merged list only needs sorting when a distant tile adds translucent
draws, and ties now break the same way as main's reversed visible order:
with LODs off the draw order and cost are exactly main's.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: reviewed; verify passes. Main merged into the stack (processors.rs tests kept from both sides; port-pack tests pass on each layer, clippy clean). Parity: all 269 game-side harnesses on modpacks-8's integration commit, structure-start oracle 35/35.
🤖 Agent: reviewed; verify passes. Main merged into the stack (processors.rs tests kept from both sides; port-pack tests pass on each layer, clippy clean). Parity: all 269 game-side harnesses on modpacks-8's integration commit, structure-start oracle 35/35.
🤖 Agent: reviewed; verify passes. Main merged into the stack (processors.rs tests kept from both sides; port-pack tests pass on each layer, clippy clean). Parity: all 269 game-side harnesses on modpacks-8's integration commit, structure-start oracle 35/35.
🤖 Agent: reviewed; verify passes. Main merged into the stack (processors.rs tests kept from both sides; port-pack tests pass on each layer, clippy clean). Parity: all 269 game-side harnesses on modpacks-8's integration commit, structure-start oracle 35/35.
processors.rs tests: keep both #926's trial spawner and vault tests and
#920's Repurposed rule-test test.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Keeps #905's single command buffer and #939's occlusion culling: distant
tiles draw in phase 1, so phase 2 stays exactly the deferred sections the
culling test reads back, and the flat path's origins include the tiles in
main's relocated upload block.
Adapts to main's APIs: block sprites and models now live in RenderAssets
(WorkerContext::render), BlockFacts behind Resources::facts(), and
terrain vertices hold the UV as 16-bit fixed point (#df58a474). Merged
distant faces repeat their sprite once per block, which the [0, 2) section
UVs cannot hold, so tile vertices now store UVs from the face's corner in
1/32-block steps (TerrainVertex::tiled, faces split at 1024 blocks) and the
instance's origin.w carries the UV step: 1/32768 for sections (decodes
exactly as before), 1/32 for tiles.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: reviewed; verify passes. HD 620 (Vulkan/Mesa) culling off → on: RD16 +22–42 % FPS (peak unchanged, culling paused), RD32 +14–109 %; 1 % lows and CPU ms equal or better except RD32 peak's 1 % low (38.8 → 37.4). Screenshots: static views within main-vs-main noise, 21 frames after 30–40° camera jumps identical (no popping). parity section_mesh, translucency, light, hud locally; CI parity covers the rest. On only on Vulkan devices with SHADER_EARLY_DEPTH_TEST, INDIRECT_FIRST_INSTANCE and fragment-writable storage; Metal draws as before. Not yet checked on NVIDIA/AMD or Windows Vulkan: HORIZON_GPU_CULL=0 turns it off.
Sections that terrain in front hides entirely are drawn with an instance
count of 0. Phase 1 draws the sections the last test read back saw; in the
same pass every other section's box (and an eighth of phase 1's) is drawn
against phase 1's depth, front faces only, with a fragment shader forced
past an early depth test that marks the section seen. Phase 2, in a second
pass, draws what the test saw. The test is exact per pixel and needs no depth
read or Hi-Z, and every solid draw stays one entry of one list, so the CPU
records as many draws as before (Mesa unrolls a multi-draw per entry on
Intel Gen9). Culling pauses while the last result hid under a tenth of the
solid indices, with one frame in 64 testing everything.
HD 620 at RD16: +23-42% FPS in five of perf-frame-6's six views, the peak
view unchanged; RD32: +14-109%. Pixels unchanged, also on camera jumps.
Vulkan only: naga's MSL has no early fragment tests. HORIZON_GPU_CULL=0
turns it off, `all` culls every frame; `section-cull on|off` in a game.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: reviewed; verify passes. Release dry run on this branch (run 39167763008): linux, macos, windows builds and publish all succeed; horizon-server-linux-x86_64.tar.gz (28 MB) built and import-checked (no libasound/libudev). Agent's proof: 880/879 client tests in both builds, dedicated_server/server_entities/lan on the server build, install → init → start → bot join on the ThinkPad without the libraries.
🤖 Agent: reviewed; verify passes. Equal-work server benchmark: fixed exploring speed, 300 s warm-up, chunk-work comparison per run. Horizon 1.8/4.7/11.7/23.8 ms per tick at 1/10/25/50 bots vs vanilla 11.3/34.3/50.5/stopped by its watchdog; single runs on the ThinkPad, caveats in the README.
🤖 Agent: reviewed; verify and parity pass. tools/vanilla_client.py runs on macOS (vsync off so a hidden window doesn't block the join); the owner's vanilla 26.3 client joined a Horizon server and stayed connected 4 min.
Explore bots paced at 0.8 blocks a second and a 300-second warm-up, so both servers serve the same
paths; the work table shows it. Horizon ran as horizon-engine (the server build, from its archive).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: thanks rdbt! Verify passes. Checked locally merged with current main: fmt and clippy clean, cargo test -p horizon-client (885 passed), 14 harnesses including your two new oracles (player_sync, interaction_input, local_input, sprint_input, item_use, item_use_start, item_use_lifecycle, use_item_on, teleport_consume, lan, dedicated_server, server_player_combat, server_player_targets, server_entities), and lan_e2e pvp, hurt, eat, eating, clicks, chat, respawn in both modes: all pass. Fixes#903.
Village villagers are placed from the jigsaw templates without
PersistenceRequired (the village's iron golem has it), so Mob.checkDespawn
discarded every villager of a village generated more than 128 blocks from
the player, and the rest after a while beyond 32 blocks. Vanilla's
Villager, WanderingTrader and AbstractGolem (iron, snow and copper golems,
shulkers) override removeWhenFarAway to false.
Fixes#917.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: reviewed; verify passes. parity --changed 95/95 before the rebase; the 9 block-tick harnesses (dedicated_server byte-identical, 591 lines) and lan_e2e plates/growth/time in both modes after it; growth fails on main. Fixes#890: blocks tick from vanilla's ticket levels around every player. MSPT with 10 bots rises from ~1.6 to ~14 ms because blocks now tick at all on a server (vanilla: 40).
ChoiceTheorem's Overhauled Village swaps blocks in its templates through
Lithostitched's block_swap processor (137 lists): a map of block to
block, the new one taking Block.withPropertiesOf the old state, and the
block left alone when the new one is not registered. Carry dropped it.
- Game: horizon:block_swap, the same map; the new block's default state
with each property of the old one it has too (by name, when the value
is one of its own).
- Carry: lithostitched:block_swap becomes it.
ATM10: processors carried 136 -> 273 of 1,427 (dropped 1,291 -> 1,154).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Better Dungeons' small dungeon templates hold several chests; its Java
chest processor keeps the first, then each other one on nextFloat <= 0.2
until two have stayed, and turns the rest into cave air. Carry dropped it,
so every chest stayed.
- Game: horizon:count_cap. Of `blocks`, the first `min` a placement meets
stay, then each stays on settings.getRandom(pos).nextFloat() <= chance
until `max` have; the others become `replacement`. Counted per
placement (PlaceSettings, reset in process_infos), like the mod's
DungeonContext, set up per StructureTemplate.placeInWorld.
- Carry: betterdungeons:small_dungeon_chest_processor becomes it with the
mod's config defaults (1, 2, 0.2; chest and trapped chest).
Seed 1234, five small dungeons decorated: 12 chests -> 6.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Better Desert Temples builds its temples with placeholder blocks (orange,
red and white glass, blue and yellow concrete, red wool, polished diorite,
blank pots) that its Java processors turn into suspicious sand, sand and
sandstone, upside-down stairs, cobwebs, terracotta, TNT and pots with
sherds. Carry dropped them, so the placeholders stayed in the world.
- Game: a horizon:pick processor. A block of `block` takes the first
pick whose `below` is past one settings.getRandom(pos).nextFloat(),
else `default`; an outcome is a state or one of several by nextInt
(Util.getRandom), a new block entity or the block's own, and NBT lists
of picked strings (one float each).
- Carry: the fixed swaps become vanilla's rule; the random ones
horizon:pick with the mod's bounds (BlockStateRandomizer's sums as
floats). The processors that read or change the world around (pillars,
Diorite's waterlogging) stay dropped.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Without a local player (dedicated server, --server-thread) no block ticked:
tick_blocks returned early, so crops, fluids, redstone, pistons and pressure
plates stood still, and a LAN host ticked only around itself.
ticket_levels ports DistanceManager's levels: PLAYER_LOADING at 31 within the
view distance and PLAYER_SIMULATION at 31 - simulation distance for every
player in the level (the local player, LAN guests, a server's players), and
FORCED at 31. Random ticks run in simulation entity-ticking chunks that are
ticking chunks, scheduled ticks, block events and block entities in block
ticking ones, entities in entity ticking ones; the sculk blocks follow the
same rule. Saved ticks unpack when a chunk starts ticking
(startTickingChunk), not when it loads.
The hub keeps the tick-rate state current while nobody is in the game, so a
player joining a frozen server is told once (updateJoiningPlayer).
dedicated_server parity froze nothing while the client was sent its chunks:
saved fluid ticks there (a lava fall that never settles) ran before or after
the chunk was sent depending on each server's loading speed, and it failed on
main too. It now freezes the game until the client has its chunks.
lan_e2e gets a growth check: water flows and wheat grows next to a guest
1000 blocks from the host.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Moog's trial spawner and vault randomizing processors keep the block and
change its block entity. The templates were saved with state that breaks
them in a new world: a vault's server_data holds
state_updating_resumes_at far in the future (it never opens) and a
spawner's spawn_data an empty entity (it spawns nothing of its own).
- Game: a horizon:edit block entity modifier takes `remove`'s keys out,
then merges `data` in. append_static now merges as CompoundTag.merge
does (compounds in both are merged), not a shallow replace.
- Carry: each processor becomes vanilla's rule processor, one rule per
block state (12 trial spawner, 32 vault), with horizon:edit: the
spawner's normal and ominous configs by id, the vault's loot table and
key (the ominous ones on ominous vaults). trial_spawner/ files get their
mobs' 1.21.1 ArmorItems/HandItems as 26.3's equipment.
ATM10: 6 more processors carried (125 of 1,427).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The tool picks this machine's natives (macOS arm64 or Linux), adds -XstartOnFirstThread on macOS
and turns vsync off there: with it on, an unseen window (a locked session) blocks in
SDL_GL_SwapWindow before the client joins. docs/server.md records the join.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Repurposed Structures' jungle fortress and End stronghold still write
vertical_distance_from_start_piece, but no codec of the mod (or of Moog's
Structure Lib) reads it any more: its own structures ignore it. Carry
drops it without counting it in rules_lost, which now lists only rules
the mods do run.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
betterdungeons:small_nether_dungeon is YUNG's jigsaw structure (the same
fields and YungJigsawManager assembly) behind the mod's
smallNetherDungeons config switch, which ships on. Carry maps it as it
maps yungsapi:yung_jigsaw: minecraft:jigsaw with horizon:yungsapi.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Repurposed Structures' 10 overworld mineshafts (birch, desert, icy,
jungle, ocean...) are its generic jigsaw with one change in
MineshaftStructure.postLayoutAdjustments: the layout is not centred on
the chunk; its top goes 15 blocks under the lowest ocean floor at the
chunk's middle and 16 blocks to each side (taking one off after each
side, as the mod does), never up, within y_allowance.
- Game: "layout": "mineshaft" in horizon:piece_limited runs that step.
- Carry: repurposed_structures:generic_mineshaft becomes minecraft:jigsaw
with the piece-limited layout and that key, as its generic jigsaw does.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A merged or closed pull request's queued runs held the self-hosted runners
until someone cancelled them by hand. pull_request_target lets the token
cancel runs of fork pull requests too; the job checks out nothing. It
matches the branch and the head commit, so a fork's branch named like
another doesn't cancel that one's runs.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Two things kept Repurposed Structures' mineshaft processor lists from
loading in 26.3, and with them the mod's 5 Nether mineshaft pools:
- Its three rule tests written in Java. Carry renames them to the game's
horizon:matter_phase, horizon:piece_origin_axis_aligned_linear_pos and
horizon:y_value (213 in 75 lists), counted in the report's
rule_tests_carried.
- 1.21.1's minecraft:chain, which 26.3 calls minecraft:iron_chain (its
datafixers rename it in worlds). Carry renames it in recipes, loot
tables and worldgen files: 112 files in 5 of ATM10's mods.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Repurposed Structures' mineshafts and Nether monument test blocks with
three rule tests of their own. Vanilla, and the game, refuse a processor
list naming a type they do not know, and with it every pool naming the
list: the 5 Nether mineshaft start pools in a ported pack never load.
The game now runs them under its own types, with the mod's fields:
- horizon:matter_phase (MatterPhaseRuleTest): solid (not air, no fluid,
canOcclude), liquid, air, and air or liquid with rails and chains,
optionally inverted. Structure processors now bind the block
properties to read canOcclude.
- horizon:piece_origin_axis_aligned_linear_pos: vanilla's axis-aligned
chance over the block's distance from its template's origin.
- horizon:y_value: the block's world height in a range.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Conflicts: the hub's player state keeps both main's attributes (#857) and
#887's living_flags; remote.rs and lan.rs debug JSON keep swinging and
using; the guests' model tick keeps both the swing update and the item
in use; lan_e2e.py checks unioned. remote_player_eating reads main's
Option<Consumable> (#799): any consumable with particles, its own use
time and should_emit, as the local player does.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: reviewed; verify passes. Mac mini RD32 standing, 4 alternating pairs: 116.1 → 163.3 FPS, CPU 7.09 → 4.98 ms/frame. Screenshots of 6 views plus HUD and inventory: no pixel differs beyond main-vs-main noise. parity --changed 95/95 locally. No early return after the copies encoder is taken, so staged section copies can't be dropped.
horizon-client's cpal output and its controllers (gilrs, the DualSense's HID output) move behind the
audio and controllers features, on by default, so the game is unchanged. Built with
--no-default-features it links neither libasound.so.2 nor libudev.so.1. release.yml packages that
build as horizon-engine in horizon-server-linux-x86_64.tar.gz (xtask package-server, checked by
check_imports.py --server); install.sh installs it on Linux (and --archive installs a local one);
horizon-server already prefers horizon-engine. The Dockerfile uses it too, and CI lints it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: reviewed; verify passes. Parity: 298/298 harnesses on the integration commit 234bd101 (main + #907/#908/#910); vanilla structure-start oracle 35/35 with all five modpacks-7 changes. Merged in the required order #907 → #908 → #909 → #910 → #911.
🤖 Agent: reviewed; verify passes. Parity: 298/298 harnesses on the integration commit 234bd101 (main + #907/#908/#910); vanilla structure-start oracle 35/35 with all five modpacks-7 changes. Merged in the required order #907 → #908 → #909 → #910 → #911.
🤖 Agent: reviewed; verify passes. Parity: 298/298 harnesses on the integration commit 234bd101 (main + #907/#908/#910); vanilla structure-start oracle 35/35 with all five modpacks-7 changes. Merged in the required order #907 → #908 → #909 → #910 → #911.
🤖 Agent: reviewed; verify passes. Parity: 298/298 harnesses on the integration commit 234bd101 (main + #907/#908/#910); vanilla structure-start oracle 35/35 with all five modpacks-7 changes. Merged in the required order #907 → #908 → #909 → #910 → #911.
🤖 Agent: reviewed; verify passes. Parity: 298/298 harnesses on the integration commit 234bd101 (main + #907/#908/#910); vanilla structure-start oracle 35/35 with all five modpacks-7 changes. Merged in the required order #907 → #908 → #909 → #910 → #911.
🤖 Agent: reviewed; verify passes (client --help exits 0 without loading the game, so the start check only catches a program the system can't load). Linux installs now name the missing ALSA/udev libraries; services run through the installer's current link.
A dedicated server printed refused logins on its console as vanilla
does ("[Server thread/INFO]: Disconnecting <name> ..."), but wrote them
to logs/latest.log under the connection thread's own name
("[horizon-lan-conn/INFO]"): the file logger used the OS thread's name,
not the one vanilla logs the line from. The engine's lines now go to the
file under the same thread as on the console.
The console's times were UTC while logs/latest.log and vanilla's
console (Log4j's %d{HH:mm:ss}) use local time, so the two disagreed by
the time zone, as did the supervisor's own lines in
logs/supervisor.log and the web panel's console. Both now print local
time. Backup names keep their UTC time, as documented.
Found by the end-to-end install check on the Mac mini and the ThinkPad.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The first published benchmark for the working version (docs/server.md
section 10, item 4). It ran the v2026.10.18.15 release, as install.sh
installs it, against vanilla 26.3 with 1, 10, 25 and 50 mixed bots. The
servers ran on the ThinkPad (quiet, under nice 19) and the bots on the
Mac mini over the tailnet. Vanilla's default game rules applied on both;
Horizon's server runs the locator bar now.
Both servers kept 20 TPS throughout. Horizon used 3.7 to 5.2 times less
memory. Its average tick was shorter with 1, 10 and 25 bots and 18 %
longer with 50, while it generated about twice the new terrain a second
(the exploring bots fly as fast as each server sends chunks). Its P99
was lower at every count.
benchmarks/server-mixed-2026-10-18/ holds the README, the report and the
machine's load; docs/server.md links it from sections 9 and 10.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
On the server thread, lan_e2e --check light failed its border step (#891):
the guest's border chunk still had block light 0 next to glowstone placed
in the chunk past it. The server was right; the check was not.
same_light() waits until the host's light equals the guest's, but on the
server thread the host's game is a client too, and both are dark until
the light update arrives. They agreed at once, same_light returned, and
the next line read the guest's light before the update came.
The check now waits up to 100 ticks for the guest's border light, then
compares the host's with it.
With temporary logging on the server thread: the glowstone lands in a
finished chunk that isn't lit (the ring past what the guest tracks), so
the edit queues a full light job for its neighbours. The border chunk's
job then relights sections 15 to 17, and Hub::broadcast_light_changes
sends them to both clients as a tracked border chunk, as
ChunkMap.isChunkOnTrackedBorder does. Nothing in the engine changes.
Fixes#891
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: Merged. Bit-exact against the per-corner oracle (unit test over a dense grid, 7 seeds, wrapping extremes), CI parity passed, and the surface pass is about 10% faster in chunkgen_bench. Thanks rdbt!
On a Linux without ALSA's library (most minimal server images), the
game exits at once with the loader's "error while loading shared
libraries: libasound.so.2". The supervisor took that for a crash and
restarted it five times over two and a half minutes before giving up
with "see logs/latest.log", which holds nothing about it.
Now:
- `run` starts the game with --help first (it loads no game files) and,
if the system can't load it, stops at once with the loader's line and
the packages to install on Debian/Ubuntu, Fedora, Arch and NixOS;
- `init` prints the same as a warning after "Game:";
- install.sh lists the libraries `ldd` can't find, with the same advice;
- docs/server.md says so in the install section.
Also, a service installed without the installer's launcher on the PATH
ran `<dir>/releases/<tag>/horizon-server`: Linux reports the running
program with links resolved, so the unit pinned that release and an
update never reached it. The fallback now goes through `<dir>/current`
while it points at that release.
Found by the end-to-end install check on the ThinkPad (NixOS, no
nix-ld libraries) with v2026.10.18.15.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: Merged. Thanks rdbt for the consolidation and for merging main yourself! On de6f15e6: fmt, workspace clippy, horizon-client tests and the client build pass, and 19/19 covering harnesses pass (options, world_reopen, lan, dedicated_server, block_removal, section_mesh, resource_pack, menu_click, screen_layout, the pack, world-options, chat and container screens, and the consumable ones). We'll handle the two follow-ups noted in the comment above (the 120 s fatal timeout, and the backdrop terrain built on the event loop).
init and run looked for asset-index.json to recognise a prepared folder,
but horizon-prepare writes that file only with the optional sounds
(`horizon-prepare sounds`). A server prepared the usual way, without
sounds, was never found: init said "no prepared game files" and listed
the folder that held them. They are now recognised by
horizon-resources.json, the manifest every preparation writes and the
one the game itself reads.
Found by installing v2026.10.18.15 with install.sh on the Mac mini and
preparing from the release folder.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: Merged. Matches 26.3's KeyboardHandler.keyPress: the F3 toggle isn't conditional on a world or the absence of a screen, and the title counts as an open screen so it gets no gameplay keys. Fixes#811. Thanks rdbt!
wgpu-core ends its Metal command buffer at every pass: each render or
compute pass costs two command buffers (the pass and its barriers), each
run of copies between passes one more, and Metal creates and commits every
one on its own. The frame made about 18: the section copies in their own
encoder, the queue's pending writes for the HUD's fire animation, copies
before and after the flatten pass, and the screen effects' and HUD's
vertex uploads between later passes. At render distance 32 that cost 2-5 ms
of submit per frame, mostly waiting on the command queue's lock.
The frame now records after the section copies in their encoder, stages
the fire animation and the HUD's glyph patches through the frame's belt
instead of Queue::write_texture, and records every upload (screen
effects, HUD, flatten inputs, indirect draws) before the first pass.
The commands and their order within each pass are unchanged.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A `fly` benchmark replied with frame times only. With single player on its
server thread, the world's ticks no longer show in the frames, so a flight
could not tell how long the server took.
The summary now has tick_ms and tick_ms_max: the world's smoothed tick time
(the F3 server line) averaged and at its highest over the flight. On the
server thread it is the server's.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Block triggers counted only the host's own player and the minecarts, so a
guest stepping on a plate did nothing. The guests in the level, not
spectators, now trigger them through Entity.checkInsideBlocks and are
counted by the plates' entity queries. On the server thread no block
ticks run at all yet (#890).
lan_e2e.py plates: a stone plate under the guest, on both sides.
Part of #848
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: Merged. Fixes#861: a ctl tp/fly move is sent even while the destination chunk isn't loaded, the single-player owner is exempt from the move check as in vanilla, and wait-ready waits for the level around the player. lan, dedicated_server, server_entities and server_dimension_players pass.
🤖 Agent: Merged. CI parity and verify passed, and on current main with this branch, horizon-client clippy is clean and all its tests pass (873 lib + integration). Consumables now finish as in vanilla 26.3.
With the world on its server thread, a horizon-ctl `tp` or `fly` moved the
window's player to chunks the server had not sent. The client skips its
tick while its own chunk isn't loaded, so it never sent the move, and the
server kept streaming the old area: "loading terrain..." forever.
- The client sends a move made where nothing is loaded (by horizon-ctl;
a player who walks there has already sent it), so the server streams
the chunks there.
- The integrated server doesn't check its owner's moves, as vanilla's
`shouldCheckPlayerMovement` (`isSingleplayerOwner`); a long `tp` was
"moved too quickly".
- `wait-ready` on a server also waits for the level around the player
(`PlayerLoaded`); the status shows it as `server.loaded`.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
BrewingStandBlock opens BrewingStandMenu for a guest: the host clicks it on
the menu engine over the stand's slots (one bottle per slot, ingredient and
fuel slots, quick moves by item) and sends its four data slots
(BrewingStandBlockEntity.dataAccess). The guest opens minecraft:brewing_stand
menus, maps their slots, predicts clicks on Kind::Brewing and shows the
times. Reported by Tydragon00.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Neither side sent LivingEntity.DATA_LIVING_ENTITY_FLAGS for players, so
no one saw another player eat, draw a bow or raise a shield. The host now
sends the item in use and its hand for itself and every guest (always:
the trackers send only the entries that changed, and stopping is a change
back to 0), and draws its guests' bodies using their items. A guest's
client starts and stops the other players' item use from the flags and
drops their eating crumbs at their mouth (Consumable.onConsumeTick); the
eating sounds already come from the server.
lan_e2e.py eating: the host and the guest each see the other eat bread,
and stop.
Part of #803
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The host ignored ServerboundPunchPacket, so a guest mining or hitting
swung only on its own screen; only the first swing a guest's use ever
started went out, the host's own swings never did, the host drew no swing
on guests' bodies and a guest's client ignored
ClientboundSwingAnimationPacket.
The host now swings the guest's hand on a punch (handlePunch), sends each
tick's guest swings to the players around and the host's own to the
guests, and swings and ticks the guests' bodies it draws. A use the server
ran that swung goes back to the guest too: Horizon's client does not run
uses itself, so it never predicted that swing (the hoe). The guest's
client swings itself or the other entity on the packet.
lan_e2e.py swings: mining swings seen from each side, and the guest's own
hoe swing.
Part of #848
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The host told guests of a hurt mob with EntityEvent 2, which 26.3's
clients read as a kinetic hit, not a hurt. It now sends
ClientboundDamageEventPacket (ServerLevel.broadcastDamageEvent) with the
damage type and the attacker, and the guest's client restarts the hurt
flash and jolts the walk animation (LivingEntity.handleDamageEvent).
lan_e2e.py hurt: a pig the guest hits and one the host hits flash on
both sides.
Part of #848
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The guest's client closed every menu it had no screen for, so hoppers
(MenuType.HOPPER) and dispensers and droppers (GENERIC_3x3) did nothing.
They open as their 5 and 9 slot screens now, drawn by the menu's type
and under the server's title.
lan_e2e.py machines: each opens with its slots and keeps a stack the guest
shift-clicks in.
Part of #848
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The host sent the overworld clock's rate even while /time pause held it
(ServerClockInstance.packNetworkState sends 0 when paused), so a guest's
day kept running. A guest also moved its clock by the rounded rate each
client tick and never caught up when the server's game-time sync moved
game_time on, so a guest whose game lagged fell behind for good.
ClientClockManager.tick advances the clock by the game time passed, with
its partial tick; the guest now does the same.
lan_e2e.py time: the paused clock and a guest stalled for 4 seconds.
Part of #848
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A client joined to a server (and the window on the server thread) keeps the
server's chat lines in its own list. The event log only counted the local
chat's lines, so `wait-for chat` never saw a line from the server.
The remote client counts the lines it receives. The event log reads that
count and those lines while connected.
lan_e2e gets a `chat` check: a line the host sends reaches the guest's
event log, and on the server thread the host window's too.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
They are Repurposed's generic jigsaw with a start check of their own:
carried as minecraft:jigsaw with the piece-limited layout and the
check named in horizon:start_checks.repurposed.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Repurposed Structures' city_nether, shipwreck_nether and stronghold_end
types are its generic jigsaw with one more start check each. The
`repurposed` key of horizon:start_checks names the check:
- city_nether: no block from sea level + 20 to sea level + 45 at the
corners of the eight chunks around;
- shipwreck_nether: no solid, filled block in a 33x30x33 grid above the start;
- stronghold_end: land at least 45 above the bottom at 70 and 35 blocks
in each direction and at the start.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Carry used to take every processor written in Java out of its list (#822),
so spawners kept what the template has: an empty spawner in Moog's
templates, a placeholder pig in Better Dungeons'. The new processors module
rewrites the ones with a data form before that:
- Moog's Structure Lib's and Repurposed Structures' spawner randomizing
processors become horizon:spawner_mobs, with Repurposed's rs_spawners list
written in (weight-0 entries left out, as its loader does);
- YUNG's Better Dungeons and Better Desert Temples spawner processors (a
spawner or a placeholder block becomes a spawner of a fixed mob) become
vanilla's rule processor with an append_static block entity, the entity in
26.3's shape (equipment, drop_chances);
- Moog's vanilla loot swap is a no-op while its "replace vanilla" preset is
off, as they ship, and is taken out.
Each is counted in carry-report.json's processors_carried. The game's own
horizon: types stay in the lists.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Moog's Structure Lib and Repurposed Structures register a spawner
randomizing processor in Java: each spawner of the template gets one mob of
a weighted list, picked with settings.getRandom(pos).nextFloat(), and the
spawner NBT they write (Delay ... SpawnRange as shorts, the mob as the only
potential and the next spawn, optional custom spawn rules). With nothing to
pick the spawner becomes the replacement block.
horizon:spawner_mobs does the same from data; horizon-port-pack writes it in
place of theirs. Without it carry drops the processors, and Moog's templates
keep their spawners empty.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A rule processor's position predicate and block entity modifier types are
identifiers: vanilla reads "always_true" as minecraft:always_true. Horizon
matched the full string, so a list writing the short form failed, and with it
every pool naming the list. ChoiceTheorem's Overhauled Village writes
"always_true" in four village pools (plains, plains fortified, halloween), whose
houses then never generated.
The two decoders move out of Rule's decode into PosRule::decode and
Modifier::decode, which normalize the type first.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
With single player on its server thread, the window is a client of the
server. The agent's `command` went out as the owner's chat and returned no
output, so harnesses that read a command's feedback (lan_e2e trials) failed.
Control `give` and `time` changed only the window's copy of the world.
The server now runs them as single player's console does without a server
thread (`as_console`): as the world's owner, in the owner's level. The
feedback goes to the owner's chat and comes back to the agent. `give` runs
`give @s`, and `time` sets the server's clock too.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: Merged after #855 and the real verify. block_removal 4000/4000 including 319 mining cases; dispenser, crafter, composter, mace and use_item_on pass.
🤖 Agent: Merged after the real verify passed. Prism's metadata renames native jars (same sha1), so prepare now also looks under Prism's name, still checked against Mojang's sha1, with nothing downloaded. Launcher and horizon-prepare tests pass.
With HORIZON_SPIKES=MS, a dedicated or integrated server tick longer than
MS ms is logged with the server thread's CPU time over the tick and the
tick's spans (tick_mobs, streaming, ...). A tick with much more wall time
than CPU time waited for a lock or for a core.
The spans recorded on a server thread were never taken before, so they
grew for as long as the server ran with HORIZON_SPIKES set.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Every spawn attempt (`NaturalSpawner.getRandomPosWithin`) asks for the
WORLD_SURFACE height of a column. Horizon scanned the column down for it
each time, a chunk-map lookup and a block-name compare per block. Vanilla
reads the chunk's heightmap.
Chunks now keep WORLD_SURFACE: built on the first read, and dropped by a
`set` that can move a column's surface (`Heightmap.update` leaves writes
two or more below it alone). Natural spawning, the spawn rules' bat check
and beacons read it.
The unused `heights` field (never written after `Chunk::empty`) is gone.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ServerLevel.removePlayerImmediately and addRespawnedPlayer: when a player
respawns, every other player tracking it gets RemoveEntities and the next
tick pairs it again as a new entity. The hub only cleared the respawned
player's own tracker, so the others kept the dead body, lying down, wherever
the player went (the host window too, on the server thread).
The in-frame LAN host's death now reaches its guests (LivingEntity.die's
EntityEvent DEATH), and its respawn goes through the same path.
lan_e2e gets a `respawn` check: the host dies and respawns (and on the
server thread the guest too), and the other side's client draws it dead,
then alive. `status` lists the other players a client draws dead.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
test_block_removal_parity gains a "mine" removal: VanillaDispenserOracle
calls the real ServerPlayerGameMode.destroyBlock for a survival player holding
a pickaxe, axe, shovel, sword, shears, a mace or nothing, and Horizon's
dispense fixture calls break_block, the path every player's mining takes (the
single player game, the server thread and LAN guests). It compares the drops,
the spilled contents, experience, sounds, events, statistics and the held
stack. On main it shows every mined container losing its contents (#844, fixed
by #855) and three gaps of Horizon's own, fixed here:
- ItemStack.mineBlock: an item with a tool component counts as used, and wears
its damage_per_block (2 for swords, the mace and the trident), also the mace
and trident, whose tool component has no rules. Shears wear on every block
but fire (ShearsItem.mineBlock).
- DecoratedPotBlock.playerWillDestroy: a pot mined with an item in
breaks_decorated_pots, unless an enchantment prevents it, cracks first and
shatters.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The generator's structure-start cache was one Mutex<HashMap>. Each
generated chunk reads the 289 start chunks around it for its references,
and the server thread reads the starts of the chunks its mobs and spawn
attempts are in (`structures_reaching`). While workers generated, the
server thread spent most of its start lookups waiting for that lock.
The cache is now 64 RwLock shards keyed by a hash of the chunk: a lookup
read-locks one shard. Vanilla keeps the starts on each chunk
(`StructureManager.getStartForStructure` -> `chunk.getStartForStructure`),
so its lookups share no lock either. The first starts built for a chunk
are still the ones everyone keeps.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: Merged after the real verify passed. Waypoints::tick −33% (166 → 111 µs median), with byte-identical packets (530,834, same hash). locator_bar, lan, dedicated_server and server_dimension_players pass.
🤖 Agent: Merged. Entities::tick −37% (112–116 → 71–75 µs median per tick at 40 bots + 570 entities), with the same 14,159,154 packets before and after. 9 covering harnesses pass (server_entities, lan, dedicated_server, server_dimension_players, locator_bar and the entity ones); main has no lan/ changes since.
🤖 Agent: Merged after the real verify passed. Combined check on this branch: fmt, clippy, workspace tests, and the worldgen, structure_density, chunk_generation and world_spawn harnesses pass. modpacks-6's own integration passed 298/298 harnesses with the start oracle at 35/35.
🤖 Agent: Merged. Mesh scheduling while flying at RD32: 0.62/0.72 → 0.36/0.22 ms per frame; at rest with ~12,000 waiting sections: 0.30–0.91 → 0.06–0.22 ms. Same checks as #865.
🤖 Agent: Merged. Terrain vertices go 28→24 B: vertex memory −14%, Metal GPU 0.62→0.54 ms. HD 620 FPS is unchanged (vertex size isn't its bottleneck). Screenshots: the only differing pixels are on water, at main-vs-main noise level, with identical drawn sections. 95/95 covering harnesses on an integration with #866 and #867.
A moving player updates its connection with every other player, three
times a tick (updateWaypoint, then updatePlayer at the position change and
at ServerChunkCache.move), so with 40 players there are about 4800
updates a tick. Each looked the connection up twice and both players up
four to six times. Now an update finds the connection's place once and
resolves the two players once, then checks, updates or remakes it there.
The same packets go out, in the same order.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Entity tracking still asks every client about every entity each tick
(vanilla re-checks each pair whenever the player sends a move, so for
moving players it does the same), but the check is cheaper:
- each entity's position, id, range and chunk are read once a tick into
a compact list, not from its EntityState once per client;
- each client looks up each of the tick's chunks once in the chunks it
holds, not once per entity in it;
- an entity with no changes and no client starting to track it skips the
loop over the clients.
The decisions and the packets are the same, in the same order.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A value back at its default is left out of an entity's state, so the
tracker never told clients that a player stopped crouching or a mob stopped
burning: Entity's shared flags and pose now go back to 0. On a client of a
server (the host window on the server thread), another player's crouch flag
now reaches their model and name tag.
From #731's server-thread list; lan_e2e's walls check passed in-frame and
failed with --server-thread.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: Merged after the real verify passed. Output is byte-identical (palettes / region files), and 17 covering harnesses passed with both PRs on main 256f7c20 (since then main has only #751, a settings UI change).
🤖 Agent: Merged after the real verify passed. Output is byte-identical (palettes / region files), and 17 covering harnesses passed with both PRs on main 256f7c20 (since then main has only #751, a settings UI change).
Prism's metadata moves a native jar's classifier into its artifact name
(com.mojang:jtracy:1.14.38:natives-windows becomes
com.mojang:jtracy-natives-windows:1.14.38) and Prism stores libraries at their
name's path, so every native jar of a Prism 26.3 install is in
com/mojang/jtracy-natives-windows/1.14.38/jtracy-natives-windows-1.14.38.jar,
not at the version JSON's path. The bytes and sha1 are Mojang's. Preparing
from a linked Prism folder stopped on the first one (jtracy on Windows).
horizon-prepare now looks there when the version JSON's path is missing; the
copy is still checked against the version JSON's sha1. The missing-file hints
no longer tell players of other launchers to install the official one.
Reported by famescare on Discord.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ClientboundUpdateAttributesPacket, as vanilla's ServerEntity sends it: every
client-syncable instance when an entity is paired, the changed ones with the
dirty entity data, and a player's dirty set to the player itself.
- Mobs and armor stands report the instances vanilla would have created
(movement speed, finalizeSpawn's bases and modifiers, the baby modifier,
effects', equipment's and /attribute's), players their LiveAttributes.
- Guests get the per-tick movement speed instance and the creative reach
modifiers (ServerPlayer.updatePlayerAttributes).
- cube::set_size sets the attribute bases as AbstractCubeMob.setSize does,
so a summoned slime has its size's health and speed.
- server_entities compares attributes again, the player's own too, with a
slime and a scaled pig in its scene.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Reads every chunk of a saved dimension, then times SaveDir's save_later and
flush against the same encoding and compression done on one thread, and
checks the written chunks byte for byte.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Sections waiting to be remeshed were one hash set that the render thread
walked section by section every frame, though every check (column loaded,
in view, its 3x3 lit, its region) holds for a whole column. At RD 32 about
12,000 sections wait at the edge of the lit area at any time. They are now
kept per column (a bit per section index), so each frame looks at each
column once and meshes all of its ready sections together.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Relighting block edits and relit chunks collected every changed cell,
sorted and de-duplicated them, then marked the sections around each cell
for remeshing. Vanilla's light engine reports changed sections to
LevelRenderer instead. LightChanges now keeps, per changed section, which
of 27 border classes (low face, inside, high face per axis) its changed
cells fall in; that gives exactly the same dirty sections and light log
without keeping or sorting the cells.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
TerrainVertex goes from 28 to 24 bytes: the UV becomes two u16 in 32768
steps per unit, which hold model UVs (multiples of 1/16 and their halves)
exactly and decode exactly in terrain.wgsl. The position stays a float:
fixed point moves the edges of offset plants and rotated elements by a
fraction of a pixel.
Section vertex memory drops 14% (RD 16: 380 -> 325 MB, arena 503 -> 369 MB);
pixels are unchanged on Metal and Vulkan outside animated water.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: Merged. CI parity passed 94 of 95. The one miss, tooltip_display, passes locally on main with this branch, and so does options. Thanks LookImEcho-Rick!
The writer thread encoded (NBT) and zlib-compressed every chunk of a batch
one after another before writing them. A batch of at least 8 chunks is now
shared out to scoped helper threads (at most half the hardware threads),
which take the next chunk as they finish one. The results are put back in
submission order and written exactly as before, so the region files are
byte-identical: each chunk's bytes depend only on the chunk, and sector
allocation follows the same write order.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
palette_ids (behind PalettedContainer::pack, every saved and sent section,
and from_values, every generated one) scanned the palette for each of the
4096 values while it had up to 16 entries, then hashed every value with
SipHash. A run of one value is now matched once, and past 16 entries a
thread-local table indexed by value (block states and biomes are below
65536) replaces the hash map; only the palette's entries are set, and they
are cleared before returning. The output is unchanged: palette in
first-occurrence order and the same ids.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: Merged. tick_lan is 40–55% cheaper and MSPT about 20% lower (40 bots, ~600 entities). The agent ran 95/95 harnesses (--changed) with #842 on main 4b43242a. The orchestrator then ran clippy and the lan tests on current main with both: clean.
🤖 Agent: Merged. light_chunk is 28% faster, light parity shows 0 differing values against vanilla 26.3, and CI parity passed on a merge with main after #824's light changes. Thanks rdbt!
🤖 Agent: Merged. Reviewed against vanilla: landing comes from Entity.move's vertical collision, the landing position is blockPosition(), velocity is zeroed per axis, and placement goes through Level.isUnobstructed with the collision shape. Locally on this head, fmt and clippy are clean, and contextual_collision, level_place, placement, powder_snow_collision and world_movement all PASS. Thanks LookImEcho-Rick!
Their jigsaw structures, the Nether variants too, get a
horizon:piece_limited key for the game's piece-limited assembler:
y_allowance, burying_type, cannot_spawn_in_liquid, the pools whose
fallbacks ignore the bounds, the Nether variants' land search and ledge,
and each structure's piece counts from the mod's rs_pieces_spawn_counts
or msl_pieces_spawn_counts files. use_bounding_box_hack becomes vanilla's
use_expansion_hack. Lithostitched's jigsaw stays vanilla's.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
YUNG's enhanced random spread becomes vanilla's random spread with its
enhanced exclusion zone as horizon:exclusion_zone; the desert and jungle
temples' placements add horizon:avoid_biomes (no ocean or river within 48
blocks of the chunk's middle at y 120); Better Strongholds' adds
horizon:ring_sections. A YUNG's structure the game can start gets
horizon:disables with the vanilla type its mod's mixin turns off; Better
Mineshafts, a Java structure type, leaves vanilla's mineshafts in place.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A jigsaw structure with "horizon:piece_limited" is laid out as
PieceLimitedJigsawManager does (the same code in both mods): a fresh
random seeded by the chunk, the start piece drawn uniformly and moved to
the surface at its center, a volume 120 blocks down and 180 up, children
drawn by weight from the pools' entries in order, pieces capped per
template and some required (retried up to 40 times), pools whose
fallbacks ignore the bounds, y_allowance clipping. After the layout, the
structure's postLayoutAdjustments: the pieces centred on the chunk corner,
then buried (lowest corner, average land, lowest side) or, for the Nether
variants, moved onto the highest or lowest land or a fixed height.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: Merged. CI parity passed 88 of 89 harnesses. The one miss, dedicated_server (a known intermittent failure), passes locally on this head. Thanks rdbt!
EntitySelector.findPlayers and EntityArgument's player targets on a
hosted world or dedicated server: every guest other than the one in place
is Target::Guest, found by name, UUID or selector, and what a command does
to them (give, gamemode, tp, kill, effect give/clear, data) runs with
their state swapped in, their own messages going to their chat. The
console, operators and command blocks can all target them; execute
as/at reads their position, rotation and eye height; a teleport into
another level (execute in, the console's Overworld, a destination in
another level) moves them there.
as_guest splits into enter_guest/leave_guest so that guest turns nest,
and a guest's commands run with the hub back in self.lan (queued per
packet), so they reach the other players (and /kick works for ops).
Item and advancement names and player names in feedback take vanilla's
component shape; /kill on a guest sends vanilla's death message.
Harness: tools/test_server_player_targets_parity.py.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ServerWaypointManager's per-tick work for every moving player copied each
connection out of its row (its icon's style string too), scanned the row
again to put it back, copied the lists of players and waypoints it walked,
and looked players up through SipHash. Connections are now updated where
they are (the same row order and the same packets), the lists are walked
by index and the maps use FxHash.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Every guest had its own copy of what it was last told about every entity,
so each tick compared each entity's data and built and encoded its update
packets once per guest. A level now keeps one ServerEntity state per
entity (ChunkMap.entityMap), whose changes are worked out once a tick,
encoded once and sent to every guest tracking it; a guest's Tracker is the
set of entities it is paired with. The update cadence is the entity's own
tickCount, as vanilla's, and late clients are paired with the data the
others hold. The per-tick copy of every entity state, the id lists and the
packet lists are gone too.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Three keys a carried mod's data can hold, which vanilla data never has:
- "horizon:ring_sections" on a random spread (BetterStrongholdsPlacement):
starts only in the odd rings around the origin, with Java's int math.
- "horizon:avoid_biomes" (BetterDesertTemplePlacement and
BetterJungleTemplePlacement): no start when one of the biomes is found
around the chunk's middle block, as findBiomeHorizontal samples it.
- "horizon:disables" on a structure: every structure of the listed types
fails to start, as YUNG's DisableVanilla*Mixin makes
ChunkGenerator.tryGenerateStructure return false; in a set of several
structures the next one is tried, as in vanilla.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged: decoration_order::vanilla_order on flat arrays (RD32 8.14→1.06 ms per call; ticket order unchanged, checked against the old version). Combined on current main with #834/#835: clippy, client + world tests PASS.
🤖 Agent: merged: section uploads through one reused staging buffer and one encoder, as vanilla's SectionRenderDispatcher (RD32 exploring: FPS 43.5→56.0, CPU 23.7→18.6 ms/frame, p99 122→106 ms; sections drawn identical in 12 views). Combined on current main with #834/#835: clippy, client + world tests PASS.
Rust's bool parser takes only true/false, so the fixture failed on Python's
True/False; Java's Boolean.parseBoolean ignores case.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A jigsaw structure with "horizon:yungsapi" (min_y/max_y) assembles the way
YUNG's API's JigsawManager does: the start piece by priority then weight
from the shuffled raw entries, children breadth-first, pool or fallback per
depth, and per-element rules from the element's "horizon:yungsapi": a name
capped by max_count, a depth range, a priority, ignore_bounds and a
condition (true, false, not, all_of, any_of, depth, altitude,
random_chance, rotation, piece_in_horizontal_direction).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Vanilla reads structure templates with NbtAccounter.unlimitedHeap()
(TemplateSource.readStructure). Horizon used the default 1,000,000-node
cap, so a template past it loaded as empty: YUNG's Better Ocean
Monuments' start piece (115x64x126 blocks) never started. Limits::templates
keeps the 256 MiB byte cap and drops the node cap, for worldgen and /place.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged: LAN guests and the server-thread game keep each chunk's light and get vanilla light updates (travel CPU −17%, light_chunk −35%; lan_e2e light PASS with and without --server-thread).
🤖 Agent: merged: brewing stands tick in the level's single ticker list, in vanilla's order. perf-ticks-7's four PRs together on main d85a3603: clippy, 861 client + world tests, 19 harnesses (light, lan, dedicated_server, save_roundtrip, world_reopen, disk, datafix ×6, world, server_world_gen, block_entity ×4, chunk_stage) PASS.
🤖 Agent: merged: chunks saved in place in their region file, as vanilla (save into a full region 80.3→7.1 ms). perf-ticks-7's four PRs together on main d85a3603: clippy, 861 client + world tests, 19 harnesses (light, lan, dedicated_server, save_roundtrip, world_reopen, disk, datafix ×6, world, server_world_gen, block_entity ×4, chunk_stage) PASS.
Queue::write_buffer creates a staging buffer for every call: on Metal a
kernel call to make the buffer, then page faults while the mesh is copied
into fresh memory. While exploring at render distance 32 the render thread
made two such writes per uploaded section, plus one for its flat-draw ids.
Section meshes and flat ids now go through their own StagingBelt (4 MiB
mapped buffers, reused once the GPU has read them) into one encoder that
the frame's submission runs ahead of its own commands. A page of the
section arena that grows records its copy into that encoder too, so copies
recorded before the grow reach the grown buffer. A frame that is not drawn
still submits the copies, and more than 64 MiB of them are submitted early.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A remote client (a LAN guest, or the game on its server thread) threw away
the light in each LevelChunkWithLight and relit the column and its
neighbours itself. It now applies the sky and block layers as
ClientPacketListener.applyLightData does, and relights only block changes,
as vanilla's client does.
The hub now sends ClientboundLightUpdatePacket for the light sections that
changed in a column to the players for whom it is on the tracked border
(ChunkHolder.broadcastChanges), so light from blocks a guest doesn't track
reaches it.
horizon-ctl gains 'light X1 Y1 Z1 X2 Y2 Z2', and lan_e2e a 'light' check
comparing the guest's light with the host's.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Lithostitched's add_structure_set_entries and add_template_pool_elements
modifiers become horizon:add_to files under worldgen/<kind>/horizon_added/,
upgraded as the mod's own pools are. Their load conditions (lithostitched's
predicate, NeoForge's, else Fabric's) are checked against the mods ported
along; other modifier types and tag targets are counted, not carried.
ChoiceTheorem's Overhauled Village adds its villages and outposts to
vanilla's sets in Java code; carry writes them with its default config
(small, medium and large villages weighted 10, 4 and 1, outposts 1).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A content mod's structure set or template pool file holding
"horizon:add_to" appends its entries to the sets or pools it names
(vanilla's, another mod's) instead of being one of its own, as
lithostitched's add_structure_set_entries and add_template_pool_elements
modifiers do on NeoForge and Fabric. The content root merges them after
every mod's own files, in mod and file order; a name nobody defines is
skipped. Vanilla data never has the key.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged: worldgen block states rewritten to 26.3's format (1,005 files in 17 mods). Combined check of main + modpacks-5's six: clippy, tests, worldgen structure_density block_properties registry_fluid chunk_stage PASS.
🤖 Agent: merged secure chat as vanilla 26.3's server (chat sessions, signed chat and commands, enforce-secure-profile; secure_chat harness identical to vanilla offline and online; 7 server harnesses pass).
🤖 Agent: merged: the integrated server follows the window's render distance past 32 (fixes#804), and the lan_e2e hazards check now finds the guest by name (the server-thread hunger gap was a test bug).
IntegratedServer.tickServer: the server takes the window's render and
simulation distances when they change ("Changing view distance to N, from
M"), tells every player (SetChunkCacheRadius, SetSimulationDistance), and
each player's chunks follow, up to what they asked for. The integrated
server no longer clamps the view distance to 32, and a remote client sends
its render distance again when it changes (Options.broadcastOptions),
past 32 too. Fixes#804.
lan_e2e: a distance check (--server-thread), and the guest is found by
name in lan status, where the server thread lists the owner too: the
hazards check read the owner's food (the "no hunger from moving" gap).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
tick_block_entity_anims rebuilt a map of every drawn block entity, sorted
it and swept the animation states against it every tick. The renderer now
keeps a revision that changes when its block entities do, and the sorted
ticker list is rebuilt only then. The animation states use FxHashMap.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Chat session updates with their profile key checked against the services'
keys, signed chat and the message chain, last-seen acknowledgements, the
signature cache, signed say/me/msg, enforce-secure-profile, and vanilla's
log lines. Offline servers and players without a chat session chat
unsigned, as on vanilla. tools/test_secure_chat_parity.py compares both
servers with test keys and a mock services server.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Repurposed Structures' and Moog's jigsaws check biomes and terrain height in
a radius and refuse to start in liquid; their spreads keep a minimum
distance from the world origin and away from several other sets. Carry maps
them to vanilla's jigsaw and random spread and writes those rules under
horizon: keys; the game now runs them (start_checks.rs, the spread's
min distance and exclusion sets). Vanilla data has none of the keys.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The game, like vanilla, refuses a processor list holding a type it does not
know, and with it every pool naming the list, so those structures did not
generate at all. Carry now takes the library types out of processor lists
(files and inline ones in pool elements) and counts them by type in the
carry report: the structures generate, undecorated. On ATM10's carried
mods: 1,427 processors of 146 types; pool decode failures 31 -> 0.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Repurposed Structures' and Moog's jigsaws and spreads add rules on top of
vanilla's; mapped to vanilla they were lost, and Moog's spreads structures
1.65 times as far apart as its files say, so MVS alone started 9x as often
as on NeoForge. Carry now writes the start rules under
horizon:start_checks, the minimum distance and the super exclusion zone's
sets (from the mod's structure set tags) under horizon: placement keys,
and scales Moog's spacing. Layout rules (piece clipping, burying) are still
lost and counted in the carry report's rules_lost.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
1.21.1 writes a block or fluid state in worldgen JSON as {"Name", "Properties"};
26.3's codec reads {"id", "properties"} and refuses the old shape, so every
processor list, feature or pool holding one failed to decode. Carry now
rewrites them. On ATM10's carried mods: 1,005 files in 17 mods.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The game and the assets step each parsed facts.json into a JSON tree, then
copied each state into an NBT tree, before building the registry. With a
pack's 214,000 states each step peaked at 816 MB for a 139 MB registry.
The registry now deserializes the rows it needs straight from the file
(each row's state and its air and fluid columns, and the defaults):
registry peak 816 -> 153 MB, assets peak 816 -> 235 MB, RSS after the
assets step 1,344 -> 442 MB. Vanilla: 138 -> 27 MB.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Saving a chunk read every chunk of its region file and wrote them all to a
new file. The writer now writes only the saved chunk, into the first free
run of sectors (RegionBitmap), points the header at it and then frees its
old sectors (RegionFile.write / clear), with one flush per region and batch.
Readers and the writer share one open file per region. A chunk queued again
before the writer reached it is written once, by its newest batch
(IOWorker.pendingWrites).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Brewing stands were the last server ticker with a pass of its own over the
whole block entity map every tick. They now tick in their place in
Level.blockEntityTickers, as BrewingStandBlock.getTicker makes them: in
list order, only in block-ticking range and inside the world border, with
their bottle states written as each one ticks.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged: creaking heart scan only in sections whose palette holds a heart (240→3 ms per 15 s). Combined check of main + perf-ticks-6's six: clippy, tests, 8 harnesses PASS.
🤖 Agent: merged: vanilla FULL ticket square per server player (RD32 finished chunks 8809→4761, spawn CPU 153→98 s). Combined check of main + perf-ticks-6's six: clippy, tests, 8 harnesses PASS.
vanilla_order replays vanilla's ticket scheduler over every chunk in view
each time the player crosses into another chunk, on the render thread. At
render distance 32 that is about 200,000 level updates in SipHash maps:
8 ms per call. Over dense grids covering the square it can touch, the
same replay takes 1 ms. A test checks the order against the hash map
version for several centres and radii.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A content mod's data/<ns>/worldgen/ files were copied into the content root,
where nothing reads them: the worldgen loader reads bundles. The build now
adds a mod's structures, structure sets, template pools, processor lists and
configured and placed features to their bundles, its data/<ns>/structure/
templates to worldgen/structure/<ns>/, and its biome tags to the biome tag
bundle. The loader refuses a biome tag naming what it lacks (another mod's
biomes, a loader's convention tags), so those entries are dropped, as they are
from block and item tags. Biomes, noise and density functions stay out: they
would change vanilla's terrain.
Structure and placement types Horizon does not have stay unsupported, as
before; carry-over maps the common mod ones next.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
26.3's copper and iron vein rules both bind minecraft:overworld/ore_vein/richness
eagerly, so the material stage sampled the same root over the same chunk volume
twice. Bindings of one compiled root now share its buffer; sampling is
deterministic, so the values are identical.
The two vein density reads per solid block went through
DensityVolume::index_of_block, which divides and takes the remainder by the
step on each axis. The stage's volumes are unit-step, so index them directly
(falling back for strided volumes).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A remote client's chat now sends ServerboundCommandSuggestionPacket for an
argument node whose provider is minecraft:ask_server (bossbar ids, data
storage, datapacks, team names, functions...), as ClientSuggestionProvider.customSuggestion
does. The suggestions are done when ClientboundCommandSuggestionsPacket
answers that id; its completions join the local ones (Suggestions.merge).
Replies to older requests are dropped.
The remote tree takes each node's provider from the packet only: a local
provider the server didn't send stood in for the server's before.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A dedicated server draws nothing, like the integrated server, yet its
streaming still meshed every section it lit (Streaming::mesh followed only
options.integrated). It now skips meshing too.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
TitleCommand sends the targeted player ClientboundSetTitleText,
SetSubtitleText, SetActionBarText, SetTitlesAnimation and ClearTitles. A
guest's /title (the window's own player on the server thread too) only
changed the server's HUD; it is now sent to the guest. The remote client
showed titles and action bars as a bare line and ignored subtitles, times
and clearing; it now feeds the HUD's titles as ClientPacketListener does
(the action bar of a SystemChat overlay too) and ticks them (Gui.tick).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The hub held SetHealth back once a guest died, so the guest's health
stayed at its last positive value under the death screen. ServerPlayer
sends it every tick it changes, dead or not, and only when the health or
the food level changes or the saturation reaches or leaves zero: the hub
sent it on every change of saturation too.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
DistanceManager.PlayerTicketTracker gives every chunk within the server's
view distance (Chebyshev) of a player a PLAYER_LOADING ticket at level 31,
so FULL (33) reaches two chunks past it and FEATURES and TERRAIN one and
two more. A server player's streaming area was a circle of radius
(view distance + 2) * 3 / 2 + 1, finished one further: 2.1x the chunks at
view distance 12. It is now that square, and lan status reports the
server world's chunk counts.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged vanilla-order block entity ticking (new harness: 21,590/21,590 ticks match vanilla; block-entity share of the tick 19.5%→9.6% with 50 bots; 90/90 harnesses locally).
Follow-up to #773 (consume effects on food):
- ApplyStatusEffectsConsumeEffect always draws its float and skips the
effects when the draw is >= probability (#773 skipped the draw at 1.0
and applied on <=).
- on_consume_effects run for every consumable, not only food: milk can be
drunk (clear_all_effects, then the bucket), honey removes poison and
leaves its glass bottle, stews their bowl (UseRemainder).
- The consumable's own timing, sound, animation and particles
(consume_seconds, sound, has_consume_particles) through horizon-world's
Consumable.emit, in vanilla's draw order; FoodProperties.onConsume's
sound and burp; the used statistic; the eat or drink game event after
the effects.
- teleport_randomly (chorus fruit) through horizon-world's verified
TeleportConsume port, with LivingEntity.randomTeleport for the player
(border clamp, entities_can_teleport_to ground, collision and liquid
checks), the teleport game event and sound, level event 2017's
directional particles and entity event 46's portal particles.
- tools/agent_control_e2e.py: a consume scenario (golden apple at full
hunger, milk, honey, chorus fruit).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
CommandSourceStack.broadcastToAdmins beyond a guest on a dedicated server:
- The dedicated server's console tells every operator what its commands
did, as `[Server: ...]`, when `broadcast-console-to-ops` is on
(DedicatedServer.shouldInformAdmins). This covers the game's commands
and the dedicated-only ones vanilla broadcasts (op, deop, ban, pardon,
kick, whitelist, save-all, save-on/off, stop).
- In a world open to LAN, the host, an operator when commands are
allowed, hears of its guests' commands, and op guests hear of the
host's.
- A player's name in the line is their display name, with the `/tell`
suggestion, the entity hover and the insertion (Player.getDisplayName).
New harness test_server_ops_feedback_parity: two vanilla-codec
operators' system chat while the console and one of them run commands,
deop and op, toggle send_command_feedback and save, with
broadcast-console-to-ops on and off. LocatorBarClient can record system
chat (`chat on`). lan_e2e's feedback check also asserts the host is told.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
On a dedicated server, `execute in <dimension> run tp @s ...` from a player
moved them inside the level they were in. It now does what vanilla's
TeleportCommand does: ServerPlayer.teleport into the other level, with the
Respawn packet keeping all data and no portal sound, then the feedback. The
players there are tracked to them and they are removed from the ones they
left.
tools/test_server_dimension_players_parity.py joins two players to a vanilla
and a Horizon server and compares, step by step, the players each is sent and
loses and the dimensions it respawns into, while they go to the Nether and
the End by command and through an End portal. LocatorBarClient gains
`players on` and `still NAME` (the position reminder a still client sends).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
`generate-structures=false` (server.properties, stored by #733) and the
world screen's Generate Structures were written to the world's settings
but the generator ignored them. VanillaTerrain now builds its generator
from the world's `generate_structures`
(OverworldGenerator::for_world): without structures there are no starts,
terrain adaptation or structure pieces, as in
ChunkStatusTasks.generateStructureStarts, and `locate structure` and eyes
of ender find nothing (ChunkGenerator.findNearestMapStructure).
The server world gen harness's world without structures now also
compares `locate structure` for a village and a mineshaft and the saved
chunks' structure starts and references.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A Horizon client of a server places what PR #766 sends: primed TNT with
its fuse, falling blocks with their block state and start position,
arrows (critical, in the ground), snowballs, eggs, pearls, fireballs,
wither skulls, wind charges and llama spit, tridents, firework rockets
and end crystals with their beam and base. They interpolate like mobs,
turn with the move packets, and are cleared with the connection, a
respawn or a dimension change.
`status` lists them (`projectiles`), and lan_e2e has a `projectiles`
check: the guest sees the host's primed TNT, end crystal and landed
arrow where the host has them, and a falling block lands on both sides.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
`/summon minecraft:tnt` and primed TNT in a saved chunk were kept as an
unsimulated entity. They now become primed TNT with the fuse (80 when
absent) and motion they were saved with (PrimedTnt.readAdditionalSaveData).
The entity harness runs its scene for a fixed 200 ticks (`tick step`),
so what still changes when the client stops recording (a fuse) ends the
same on both servers. Its scene has two primed TNT (one falling), a
floating falling block, an arrow that lands and an end crystal. Unit
tests cover arrows' position and rotation, fireballs' bundled power and
precise position syncs.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
These entities had no id in Horizon, so a server could not send them to
its clients. Each now has one, given from the entity counter before it is
first tracked, and goes to guests as vanilla's ServerEntity sends it:
- primed TNT with its fuse (sent each tick it changes) and falling blocks
with their block state and start position; both sync their exact
position while they touch a block (requiresPrecisePosition);
- arrows and tridents send their position and rotation every update
(AbstractArrow), with their flags, pierce level, in-ground state,
loyalty and foil; their owner is the spawn data;
- fireballs, wither skulls and wind charges bundle their velocity with
ClientboundProjectilePowerPacket (new in horizon-protocol);
- snowballs, eggs, pearls, llama spit, shulker bullets and splash potions;
- firework rockets with their item, the player they boost and whether
they were shot at an angle; end crystals with their beam and base.
The entity harness's scene gains primed TNT, a falling block, an arrow, a
snowball and a trident that land, a fireball, a firework and a crystal.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ClientPacketListener.handleAddEntity for the objects a server tracks: a
Horizon client of a server (a LAN host, a dedicated server, single
player's server thread) now places the boats, minecarts, armor stands,
item frames and paintings it is sent, where the server says.
- Spawn: carts by kind, boats and rafts by wood (with a chest), armor
stands, frames and paintings at their block with the direction from the
spawn data.
- Entity data: frame items and rotation, painting variants (a registry
holder), armor stand flags and health, boat paddles, vehicle hurt.
- Equipment: what an armor stand wears and holds.
- Moves interpolate like mobs'; rotation and ground state follow.
- They are cleared with the connection, a respawn or a dimension change.
`status` lists them (`objects`), and lan_e2e has an `objects` check: the
host summons them, the guest sees each as the host has it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A server sent its clients only mobs and dropped items. Boats, every kind of
minecart, armor stands, item frames, paintings and the entities Horizon keeps
without simulating are now tracked as ServerEntity does: the AddEntity data
(hanging entities at their block, with their direction), the synched data that
differs from the defaults, equipment, passengers (ClientboundSetPassengersPacket
at pairing and on change; a passenger syncs only its rotation and resyncs its
position when it dismounts), and the type's update interval and range.
Also vanilla-exact on the way, as the new harness found:
- mobs pair with their health (always non-default) and Mob flags (no AI, left-handed);
- /summon without NBT summons any type from an empty compound;
- armor stands move before gravity (LivingEntity.travelInAir), so a stand at rest
keeps vanilla's -0.0784 vertical motion.
tools/test_server_entities_parity.py compares, from a vanilla-codec client, what
vanilla's dedicated server and Horizon's track for a scene of 20 entities.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
scan_for_hearts read all 4,096 blocks of every non-air section of each new
chunk on the server thread to find creaking hearts. A section whose palette
holds no heart state (PalettedContainer.maybeHas) cannot have one, so it is
skipped. Same block entities, same order.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged the six LAN guest fixes for #696 (#722–#727), combined on main and checked locally (clippy, tests, parity lan/dedicated_server/mob_ai, lan_e2e clicks/sleep/push/eat/xp).
These entities were drawn every frame wherever they were in the loaded
world: every armor stand, item frame and painting of every loaded village
or base went through its model, item and per-vertex occlusion test even
far behind the camera. EntityRenderer.shouldRender now decides, as for
mobs and minecarts:
- Entity.shouldRenderAtSqrDistance from the current position: 64 times the
bounding box's mean edge times the entity distance option (boats about
71 blocks, primed TNT 63, paintings by size); item frames 1024 blocks;
armor stands 256 times the box's mean edge whatever the option (4 for a
marker's empty box); tridents ten times the default (AbstractArrow);
firework rockets 64 blocks.
- the interpolated culling box grown by 0.5 in the view; tridents grow it
by 1.5 more (ThrownTridentRenderer), armor stands with a dragon head by
0.5 (LivingEntityRenderer), item frames holding a map use the block-wide
box.
The fishing bobber is unchanged: vanilla never frustum-culls it
(FishingHookRenderer.affectedByCulling) and Horizon only draws the
player's own, always within its 64 blocks.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The section occlusion search (SectionOcclusionGraph) ran on the render
thread whenever a section was meshed or the camera entered another
section: at render distance 32 that is a breadth-first walk over about
124,000 cells, and while exploring it ran nearly every frame.
As in vanilla 26.3, the full search now runs off the render thread. A
worker keeps its own copy of every section's face connectivity, fed the
changes with each job, and searches over dense arrays around the camera.
Frames use the last finished graph and never wait for the next. The search
starts at the top of the frame, as soon as the camera is known, so it
usually lands before the frame builds its visible list. A section meshed in
between propagates into the graph the frame has (vanilla's
runPartialUpdate), so a wall that opens shows what is behind it at once; a
section that closes goes at the next full search. A graph that never
reached the camera's section (after a teleport, say) is not used: until the
next one lands every section in the frustum is drawn.
The search itself is unchanged: the same box, steps and first-entry rule,
checked cell for cell against the previous code in a test.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
light_chunk's sky and block spreads read LightTables::cells for every
neighbour, and the fill and both spreads dominated lighting. Pack each
cell into two bytes (occlusion type and dampening) with a per-type
blocking mask, step neighbours by linear offset with an axis bounds
check, and precompute the per-column present table.
1156-column probe: 1.81 -> 1.31 ms/col (~28%). Vanilla light parity is
unchanged (1,179,648 sky/block values, 0 differences).
entity_motion_events looked up each moving mob in a SipHash map every
tick. The keys are mob ids the server gives out, so the fast hasher is
safe there.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Their particles, ambient sounds and the turning display mob are for a
window. A dedicated or integrated server has none, yet made a display
mob for every spawner it ticked.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The list kept its slots for the whole tick; sweeping it every tick cost
two hash lookups per ticker. Now it is swept only when a slot was freed
or a block entity was taken out and not brought back.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
BlockSection::get and set check the section index and the state id once,
then read and write through new PackedStorage::read/write, which skip the
storage-level bounds and value checks and the Result that get/set keep for
external callers. A section index is below 4,096 and a palette id always
fits the width bits_for_palette chose; both methods debug_assert that
contract. Used for the hot read, the hot write and the growth re-encode.
Benchmark (ignored tests, best of alternating-order rounds, fast profile):
BlockSection::set 13.15 -> 9.12 ns/write (1.44x), get 2.33 -> 1.45 ns/read
(1.61x). See docs/performance/paletted-container-access-results.md.
World::block_entities keeps vanilla's Level.blockEntityTickers beside the
map: a slot when a block entity whose state has a ticker is added, kept
when it is replaced, freed when it is removed, unloaded or its state loses
the ticker; a loaded chunk's in its block entity map's order. The tick
visits that list once, in block-ticking chunks within the world border,
instead of scanning the whole map once per kind.
New harness block_entity_tickers: real LevelChunks of a server level
against BlockEntities.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged by Ludovic's AI agent. CI parity passed (harness paths stay synchronous). Smoke test of the new path on current main (macOS, --offscreen, normal launch): resources loaded on the worker in 9.3 s, renderer swapped, title screen up and running for 60 s, no panic. Thanks @rdbtCVS!
The NBT tables stream, the fluid tables reuse the game's facts and the content
root is kept between starts (#753, #754, #756). Horizon with ATM10's 40 data-tier
mods against the same mods on NeoForge 21.1.259. Worldgen carry-over and what it
does not cover yet (#763, #764). Chipped's harness row with its self-drop tables
(#762). The overlay cache line said it was cached; it is now.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
BlockSection::set resolved the old cell through get and then probed the
section palette three times per non-trivial write: keying the old state by
id, testing the incoming state and finding it. The slot at the written index
already is the old state's id, so read it straight from storage and resolve
only the incoming state, with a single map probe. Palette reuse, free slots
and growth are unchanged, so palette, counts, free list and NBT are identical.
PalettedContainer::unpack and unpack_u16 matched the palette variant inside
the per-cell loop; dispatch Single/List/Global once before it.
Measured against copies of the pre-optimization code (ignored tests):
BlockSection::set 12.73 -> 11.37 ns/write (1.12x), unpack list 1.956 ->
1.860 us/call (1.05x), global 2.255 -> 2.172 (1.04x). See
docs/performance/paletted-container-access-results.md.
set_matches_baseline_under_random_edits drives both implementations over the
same 50k-edit streams for 1/2/16/17/24/64 distinct states, with periodic
whole-section collapses, and asserts equal results, bits, palette, counts,
free list and NBT.
Structure mods build on libraries whose structure, placement and pool element
types are vanilla's with extra rules: Lithostitched's, Moog's Structure Lib's
and Repurposed Structures' jigsaw structures, their advanced random spreads,
versioned and ocean-bottom single pool elements. Carry rewrites them as
vanilla's types; the extra rules (no start in liquid, a minimum distance from
the origin) are lost, so a structure may start where the mod would not. Types
with no vanilla counterpart (YUNG's, Formations', the nether variants) are left
as they are and counted in the carry report.
The structures' biomes name the loader's convention tags (#c:is_plains). fetch
now also gets the pack's NeoForge jar from NeoForge's Maven repository, checked
against its SHA-1, and carry copies the convention biome tags each mod's
structures use, with those they include, into the mod.
ATM10's 42 carried mods: 1,061 files rewritten, 103 convention biome tags.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Chipped registers its blocks' loot in code: its jar ships 7 loot tables for
about 7,000 blocks, so carried over they dropped nothing, while in the NeoForge
oracle every one drops itself. When a declared block has no loot table in the
jar and the oracle shows vanilla's dropSelf (one of itself with every tool,
nothing only where the state needs a tool it did not get), carry writes that
table in 26.3's shape. When only the states with one property value drop it
and the rest drop nothing (a door's lower half), the entry gets vanilla's
match_block condition on that value, as createDoorTable writes. Chipped:
6,843 tables added.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The nether-portal section precheck from #661 answered "does this section's
palette hold a portal?" per section, per tick. Keep the answer per resident
chunk in `portal_sections`, keyed by a weak handle: an edit or a chunk
replacement rebuilds it, and it is dropped when a chunk unloads and cleared
when the block facts change, so a portal block always forces the sweep. The
entity sweep now finds portal blocks without the per-tick map.
This is a scan microbenchmark, not a whole-game claim: steady improves 2.4x
to 17x over the fixtures and the run parity-checks the cached and per-tick
answers. Rescanning every chunk every tick (cold, reload, edit_all) is slower
because a miss reads all 24 sections of a chunk; see
docs/portal-scan-benchmark.md.
Halves the CPU of deflating a chunk column and makes small packets about
20 % cheaper. The compressed bytes change; what they inflate to doesn't.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
getFiddledDistance restarts a six-step LinearCongruentialGenerator mix for
each of the eight quart corners. Its first two steps depend only on the X
and Y corner offsets, so quart_at_block now mixes the two X states and the
four XY states once, then runs the remaining steps across the eight corners.
next(m, salt + offset) == next(m, salt) + offset, so a coordinate folds into
its step with one addition.
Bit-identical to BiomeManager.getBiome and getFiddledDistance; a reference
oracle test pins the equivalence over a dense grid and wrapping extremes.
🤖 Agent: merged by Ludovic's AI agent: perf-server-5. Before/after in the PR body; agent parity 87/87 stacked; orchestrator combined check with the perf-ticks-5 stack on current main: clippy clean, client+protocol tests pass (one flaky world-delete test, #749), dedicated_server/lan/chunk_stage/block_entity_storage PASS.
🤖 Agent: merged by Ludovic's AI agent: perf-server-5. Before/after in the PR body; agent parity 87/87 stacked; orchestrator combined check with the perf-ticks-5 stack on current main: clippy clean, client+protocol tests pass (one flaky world-delete test, #749), dedicated_server/lan/chunk_stage/block_entity_storage PASS.
resource_root built the content root again on every start. With ATM10's 40
carried data-tier mods that is about 25 s on a quiet machine (50 s on a busy
one) and the biggest memory peak of the start, above 3 GB of footprint. The
root now records a stamp of what it was built from (this build of the game,
the base's manifest and rewritten tables, every mod file by size and time) and
later starts with the same stamp use it as it is.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
FluidResources decoded gameplay-facts.json a second time for three per-state
columns the game's BlockFacts already has. With ATM10's carried mods that file
is 211 MB: the second decode took a few seconds and peaked about 500 MB above
what the game keeps. MotionResources::load_with_facts takes the game's facts;
load still decodes them itself for tests and tools.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged by Ludovic's AI agent: verify passed, parity proven (CI or perf-frame-2's local run), before/after numbers and screenshots in the PR body.
🤖 Agent: merged by Ludovic's AI agent: verify passed, parity proven (CI or perf-frame-2's local run), before/after numbers and screenshots in the PR body.
🤖 Agent: merged by Ludovic's AI agent: verify passed, parity proven (CI or perf-frame-2's local run), before/after numbers and screenshots in the PR body.
The title's GUI atlas and its panorama both come from the resource root and
are only needed to draw the title and menus, but they lived apart: the atlas
on Game and the panorama inside PackResources. Gather them into UiResources so
Stage 2 can load the title bundle before the world bundle. No behaviour change.
Part of #712 (stage 2a).
A Horizon game with content mods builds its content root and block behaviour
snapshot on its first start, in its game folder, and reuses them afterwards.
perf_bench starts every game from an empty folder, so it only measured first
starts. --warm starts the game once to the title screen first, unmeasured.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged by Ludovic's AI agent once CI parity passed; screenshots identical to main (perf-frame-2), CPU frame time about 40% lower on a chest field.
occlusion.nbt, cached-collision.nbt, cached-support.nbt, block-properties.nbt and
movement-properties.nbt each carry the identity of every block state, and every
loader parsed them into an NBT tree first: 240 MB per table for ATM10's 153,511
states, about 1.4 GB allocated and freed while the game starts.
nbt::read_named_streaming hands a named list to a visitor element by element.
registry::BlockTableFile reads a table that way, checking each state against the
registry as it comes, and loaders build from a checked registry::BlockTable.
from_nbt stays for trees built in memory (tests, fixtures).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Each player's writer thread compressed every packet it sent, so a chunk
column sent to fifty players was deflated fifty times; compression was
most of the writer threads' time and about half of the server's CPU.
Bodies of 8 KiB or more (chunk columns, mostly) now go through a shared
cache of compressed frame contents keyed by their length, two
independently keyed 64-bit hashes and the threshold, holding the newest
32 MiB. The bytes on the wire are the same: frame::encode is split into
frame::contents and frame::prefixed, and ConnWriter::send_contents
sends a frame from its contents.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The synchronous startup loaded every resource before the first window
existed, so the game hung on a blank screen for seconds. An ordinary
launch now enters the event loop at once, opens the window, and draws a
loading screen with the current stage and a progress bar while a
resource-loader thread runs the existing load sequence. When it finishes,
audio is created on the render thread and the real renderer, game and
title screen replace the loading screen on the same window.
Harness, dedicated and scripted runs (--frames, --world-frames,
--benchmark, --control, --dedicated, HORIZON_MENU_STYLE=classic and the
parity fixtures) keep the fully-synchronous path unchanged, so their
output stays byte-identical. title_shown still fires on the real title,
not on the loading screen.
🤖 Agent: merged by Ludovic's AI agent once verify passed (the earlier failure was a flaky client test #721 doesn't touch; main passes it). Launcher tests run locally on main + #719 + #721: all pass. Thanks @rdbtCVS!
🤖 Agent: merged by Ludovic's AI agent. CI doesn't build the launcher on PRs, so launcher tests were run locally on main + #719 + #721 (cargo test --locked, macOS): all pass. Thanks @rdbtCVS!
Six scenes from one fixed-seed world (seed 8675309): a plains village among
savanna hills, sunset over it and the river, moonrise over its lit square, a
crimson forest with a zombified piglin, tropical fish over a warm-ocean coral
reef, and survival at dusk with a zombie and the full HUD. Plus Horizon's own
title, Singleplayer, Video options and pause screens.
Captured with horizon-ctl screenshot from the offscreen client (fullscreen
2560x1286 on the Mac mini, default graphics settings, GUI scale Auto), scenes
cropped to 16:9 and menus to 16:10 (left-aligned) and scaled to the old sizes
(1600x900, 1280x800). The scene sources are JPEGs in docs/media again, the
names scripts/assets.mjs already reads; the README's WebP copies are the
rebuilt website media. Alt texts and LEGAL.md follow the new pictures.
The launcher screenshots are unchanged: the Mac mini's session is locked, so
no window capture works.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged by Ludovic's AI agent. CI parity passed on the head; combined with current main (and #680) locally: workspace clippy clean, horizon-client 826 + horizon-world tests pass, mob_ai/save_roundtrip/spawner PASS. Thanks @Online5277!
A Prism or MultiMC instance keeps no jar of its own: the client sits in the
launcher root's shared libraries, two or three folders above `instances/`,
and the game is downloaded only once the instance is launched. Choosing
`%APPDATA%\PrismLauncher\instances` (or an instance's `minecraft`/`.minecraft`
folder) as the Minecraft folder failed Prepare when the jar was not there yet,
and the error only listed every launcher without saying what to do.
resolve now also looks in the launcher root above an `instances` folder, so a
folder deeper than the four walked above the chosen one still finds the
libraries. When nothing is found and the chosen folder is inside a launcher
Horizon knows, the error names it and says to launch the instance once so it
downloads the game.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
🤖 Agent: merged by Ludovic's AI agent after local checks on a6592eb1: workspace clippy clean; horizon-client/world/protocol tests pass; lan, chunk_stage, dedicated_server, block_entity_storage, chunk_generation PASS.
Settings gains a one-line Game arguments field, kept as `game_args` in
settings.json and appended to the client's command line after the
launcher's own, so a player can pass things like `--server-thread` or
`--render-distance 40`. Quotes group a word with spaces in it.
`horizon-launcher game-args [<line>]` shows or sets the line,
`play --arg <ARG>` passes one for a single run, and the MCP launch_client
tool takes an args array. The same splitter feeds all three.
Closes#716.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
tick_hoppers read the block under every plain container block entity
each tick (chests, barrels, shulker boxes, dispensers, droppers) to find
the hoppers. A hopper's block entity is the only five-slot one
(BlockEntity::for_block, and BlockEntity::id already names it the
hopper), so only those are looked up now; a position still needs a
hopper block to tick.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
On a LAN world or a server, guests never got experience: orbs followed and
were taken only by the host's own player (none on a dedicated server), and
guests weren't sent orbs at all.
- Each orb follows the nearest living, non-spectator player within 8
blocks, the host or a guest (ExperienceOrb.followNearbyPlayer).
- A guest takes an orb as Player.aiStep does: one of those in its box grown
by 1, 0.5, 1, at random, at most every 2 ticks (takeXpDelay), repairing
with Mending first; the rest goes to the guest's experience (sent with
SetExperience as before), the level-up sound every fifth level.
TakeItemEntity goes to the players around, the pickup sound plays at the
orb.
- Orbs have entity ids and are tracked to guests (AddEntity, DATA_VALUE).
The client shows a server's orbs, moves them with the server's packets and
flies them to their collector.
tools/lan_e2e.py xp: three 7-point orbs near the guest: it sees three and
ends at level 2 (21 points); the host gets none.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A mob's push of a guest went to the guest as SetEntityMotion carrying the
server copy's velocity, which nothing damps: every tick of contact added
to it and replaced what the guest's client was doing. Vanilla pushes
players on their own client only (EntitySelector.pushableBy): the server
no longer sends those pushes, and a server client now pushes its player
away from every living entity it touches (Entity.push, team rules, no
spectators, bats or passengers of the same vehicle).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Minecarts were drawn every frame wherever they were: at render distance 32
every chest minecart of every loaded mineshaft went through the rail
lookups, display block and model, and the per-vertex terrain occlusion
test. Vanilla draws a cart only within 64 times its bounding box's mean
edge (about 57 blocks at entity distance 100%), measured from its current
position, and only when its interpolated box, grown by 0.5 and stretched
up by the display block's offset, is in the view
(EntityRenderer.shouldRender, AbstractMinecartRenderer
.getBoundingBoxForCulling). The cart the player rides always draws.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
On a LAN world or a server, other entities' heads flickered between two
directions. The client wrote ClientboundRotateHeadPacket's head yaw into
the entity's yRot and the move packets' yRot into the body yaw, never moved
the head's previous yaw and pitch on, and never ran the body rotation, so
each frame interpolated the head from stale values.
As vanilla: move packets interpolate the position, yRot and xRot over three
ticks (LinearInterpolationHandler), RotateHead the head yaw over three
(lerpHeadTo), each tick keeps the previous head rotation for the frames, and
the body follows (a mob's BodyRotationControl, a player's walk direction
within 50 degrees of the look). AddEntity sets yRot and xRot and puts the
body and head at the packet's head yaw (recreateFromPacket).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
On a LAN world or a server, a guest's clicks that went through the menu
engine (placing a carried stack, quick craft drags, double clicks, number
keys, Q) ran only on the guest's own copy and were never sent: the item
showed in the chest or furnace, the server still had it in the inventory,
and the next menu brought it back.
menu_ops now sends every click of the server's open menu as vanilla's
MultiPlayerGameMode.handleContainerInput does: the engine predicts it on
the client's copy, then a ContainerClick goes out with the slots it changed
and the carried stack after it (a drag is its three kinds of clicks). The
plain inventory and crafting table are predicted too, the Shift double click
sends each QUICK_MOVE, and a prediction no longer drops, crafts or makes maps
on the client (the server does).
tools/lan_e2e.py clicks: real mouse presses put a stack into a chest and a
furnace, drag planks over the crafting grid and craft; the server has each.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
At the end of each tick the game thread handed every player's held
packets to that player's writer thread, waking each one: a system call
per player, and on a busy machine often the rest of the core's time
slice to the woken writer. Now the batches go to one post thread in a
single send, and it wakes the writers. A packet sent to a player while
its batch is still with the post thread goes the same way, so each
player's packets keep their order.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ChunkEncoder::body_in writes the LevelChunkWithLight body that
Clientbound::encode would give, into one buffer sized up front: the
cached section bytes and light layers are copied once, uniform light
layers are filled in place, and the heightmaps are shared rather than
cloned. Before, each chunk sent built a packet (growing its buffer,
cloning every 2048-byte layer), then encode copied all of it again.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
A server client sent UseItem and never started the use itself, so food
showed no eating animation or crumbs, and holding right click sent a new
UseItem every 4 ticks. Like MultiPlayerGameMode.useItem, the client now
starts eating (Consumable.startConsuming), counts the use down for the
animation and its particles, and starts no other use until it ends; the
server still eats the item. Looking at another player no longer stops
the item from being used (Player.interactOn passes).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The bed's sleeping state, timer and respawn point were the host's fields,
so a guest clicking a bed put the host to sleep and moved the host's
spawn. as_guest now swaps them with the guest's own; the guest gets its
sleeping pose and bed (entity data 14), wakes on STOP_SLEEPING with the
WAKE_UP animation, and the night skips only once enough players sleep
(players_sleeping_percentage). Guests respawn at their own bed, else the
world spawn. Server clients lie in the bed from the synced position.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
wgpu replays an indirect multi-draw on Metal as one draw call per entry, so
every frame encoded a draw per visible face range and translucent section
(9,300 at render distance 32). Where multi-draw is emulated (Metal) and a
frame has at least 4,096 section draws, a compute pass now copies the
frame's section draws into one index list, in draw order, and each run of
sections in the same arena page is one draw call: 9,309 draw calls become
about 750 at RD32. Smaller frames keep the per-section draws, where the
list's GPU cost (about 0.4 ms on an M4 Pro at RD16) outweighs the CPU saved.
The picture is unchanged by construction: the same triangles from the same
vertices in the same order through the same shader code. Only where a
vertex finds its section's origin changes, from the instance attribute to
a table: a section's vertices fill whole 256-vertex blocks of its page, each
block names the section, and the section's camera-relative origin is
computed on the CPU exactly as before.
Vulkan keeps the native multi-draw. HORIZON_FLAT_DRAWS=1 draws every frame
flat (any backend that supports it), 0 never; the control command
`section-draws flat|indirect` switches in a running game for A/B checks.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Apple GPUs time only pass boundaries (no TIMESTAMP_QUERY_INSIDE_ENCODERS),
so the GPU timer was off on every Mac and benchmarks reported no GPU time.
Where only pass boundaries can be timed, the frame is now bracketed by two
empty compute passes that write the timestamps.
HORIZON_SPIKES also names the renderer's parts (occlusion, visibility,
encode, submit), and the status reply counts the frame's section draws and
the draw calls that submit them.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
TickCtx gained `collision` here; main's two newer initializers
(lan_actions respawn, server_travel's server_ctx) now pass it too, as
every other one does.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
DedicatedServerProperties.WorldDimensionData: a world that doesn't exist
yet gets level-type's preset (flat or normal; an unknown name warns and
falls back to minecraft:normal), a flat world's generator-settings
(FlatLevelGeneratorSettings: layers, biome, lakes, features; a layer that
doesn't parse is logged and left out, and settings without layers use the
preset's classic ones) and generate-structures, written to
world_gen_settings.dat before the world opens, with vanilla's log lines.
Horizon ignored all three and always made a normal world.
New harness server_world_gen compares world_gen_settings.dat and the lines
logged with vanilla's for five server.properties.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
/give, /clear, /gamemode, /experience, /advancement, /playsound and the
whisper-to-yourself lines printed the host's placeholder name for the
acting player. They now use the acting player's name (a guest's own while
their command runs), as target_name and the scoreboard do.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
While a guest's command or action runs, the score holder, team, display
name and death and kill criteria of the acting player use the guest's own
name (ScoreHolder.getScoreboardName), as on vanilla's server.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
CommandSourceStack.broadcastToAdmins: on a dedicated server, a guest's
command success (sendSuccess with broadcast) is logged on the console as
"[Name: message]" when log_admin_commands is on, and sent gray and italic
to every other operator when send_command_feedback is on. The queries and
lists vanilla sends with broadcast false (commands/admin.rs) stay with the
player who asked. Lines are queued while the guest acts and sent once the
command returns.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
ditto without --norsrc --noextattr --noqtn stores an AppleDouble ._ entry
beside every file that has extended attributes, so the macOS release zip
held hundreds of them (horizon-macos-arm64/._horizon-ctl, tools/._*.py).
Package it as packaging/macos/package.sh already does, and fail the job if
any ._ or __MACOSX entry is left.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
With an explicit Present Mode (Mailbox, Immediate), the VSync option did
nothing: the setting replaced vanilla's choice even with VSync on, so a
window kept running uncapped. Vanilla's VSync means Fifo, in a window and in
fullscreen alike. Now VSync on always presents with Fifo, and the Present
Mode setting chooses only while VSync is off (Auto keeps vanilla's choice:
Immediate, else Mailbox, else Fifo). The choice is one tested function,
window::chosen_present_mode.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The LAN chunk encoder's section cache (#623) and dimension range (#668)
are kept; a cached section's wire bytes use the registry's palette width,
set once per process before any encoder exists, so the cache stays keyed
on the section alone. The sculk scan's palette check takes the u32 state.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
LAUNCHER_PATHS and launcher.yml's push paths now list horizon-bench,
horizon-friends, horizon-mods and horizon-port-pack too, the launcher's
path packages per cargo metadata. A change there (like the horizon-mods
dependency that left launcher/Cargo.lock stale) then builds and releases
the launcher instead of going unnoticed.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
horizon-port-pack now depends on horizon-mods (1f1d5a5a), which the
launcher's own lock file didn't have, so every --locked build of the launcher
failed.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
On Windows the launcher links another launcher's client jar with a hard link
(a copy across volumes) and its libraries and assets with a junction, since
symlinks need developer mode. canonicalize() of a hard link is its own path,
so the sources tests, which compared canonical paths, failed on Windows and
blocked every launcher release since launcher-v0.4.0. They now check that the
linked jar is the launcher's file (a byte written through one shows in the
other), which holds for a symlink and a hard link alike.
The modpack profile test compares paths as paths rather than strings ending
in "a/carry".
mklink /J's paths are always quoted: Rust only quotes arguments with spaces,
and cmd reads an unquoted & or ^ in a user folder as its own syntax.
CI runs every launcher test target, not just the library's.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The first criterion trigger of a world's first tick loaded the
advancement tree: about 1,400 JSON files read and parsed on the game
thread, about 60 ms of a 125 ms first tick. open_world now starts that
read on a thread, and the first advancement_tree() takes its result,
the same tree as before.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The hub tests every player's sent-chunk set for every entity and every
column of the view each tick, and each player's tracked-entity map for
every entity: tens of thousands of SipHash lookups a tick with 50
players. Both now use the Fx hash. Their iteration order was random
before and carries no meaning.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Every chunk packet scanned all 4,096 blocks of each section holding a
block entity block to list them, though the section's wire bytes were
already cached. The cache now keeps those blocks (index and state, in
scan order) beside the bytes, made in the same pass that encodes them.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
encode_in asks whether each of the nine surrounding columns' 24 sections
holds anything, to decide which light layers exist: 216 cache lookups,
each locking the cache and SipHashing a section's address. The column's
sections now share one lock, and the cache uses the Fx hash.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The hub looked up an entity's tracking range (a binary search over type
names) for every player and every entity each tick: about 87,000 string
comparisons a tick with 50 players. The ranges are now worked out once
per entity per tick; the visibility test is the same.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The generation scan walked every area's square of columns, so with 50
players standing near each other it tested about 100,000 columns a tick
(each against every player's range) to find the few hundred around them.
The squares are now merged into one run per row first. The candidates
are the same: they were sorted and deduplicated before.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
tick_hoppers read the block under every block entity in the loaded world
each tick to find the hoppers. A hopper's block entity is always a plain
container (BlockEntity::Chest), so only those need the lookup.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
PlayerAdvancements.flushDirty only works when it is the first packet or
progress changed. Horizon walked the whole advancement tree for every
network player every tick to find nothing new: a fifth of the server
tick with 50 players.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Online mode checks accounts since v2026.10.17.07; until #589, players added
before they join get offline UUIDs, with a workaround. Portals follow a
lone player since v2026.10.17.09. Copied game files need v2026.10.17.07 or
newer. Section 10 links the 2026-10-17 benchmark and says plainly that 25
moving players are too many for now. Links to other docs are absolute, so
they work both on GitHub and on the site.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
horizon-bots and tools/server_bench.py at 1, 10, 25, 50 and 100 bots,
walk and explore, Horizon (main at 123987c4) and vanilla 26.3 taking turns.
The Mac mini was overloaded by other work (load 55-141), so only the 1-
and 10-bot rows are a fair comparison; the README says so and gives the
load of every run. It also records where Horizon's server thread goes at
25 walking bots: 96 % in ChunkEncoder::encode_in.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
- perf_bench.py samples the physical footprint on macOS as well as
RSS. RSS counts the pages the allocator freed and marked reusable,
so the six mods' "+1.1 GB" is about 0.5 GB of footprint.
- examples/resource_memory.rs: live heap, peak, RSS and footprint after
each resource loader, for a prepared or a content-mod root.
- BlockRegistry indexes ids by a hash of the state, checked against
the states, instead of keeping every state twice: -22 MB live for
vanilla, -124 MB for ATM10's 42 mods (193,762 states).
- docs/modpacks.md: the per-loader breakdown and the next cut (the
per-state tables parsed whole at startup).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
With the wide state ids, ATM10's 42 data-tier mods (193,762 states)
reach the world once these loaders stop refusing them:
- Block sprites: eight texture arrays of 2048 layers instead of four
(9,790 block textures for the 42).
- Per-state tables read as NBT: the table limits cover 2^20 states, and
the collision table in level data uses them.
- Worldgen block tags: 2^20 blocks instead of 8,192 (mineable/pickaxe
holds every stone block of a pack).
- As vanilla's loaders do, a blockstate definition that does not bind,
a missing or broken block model of a mod, and a recipe that does not
parse are logged and skipped instead of dropping every mod (or
stopping the game).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Chunk sections keep block states as u32 and size the global palette
to the registry: 16 bits for vanilla's 35,723 states, wider when
content mods take the registry past 65,536. The content-mod limit
goes from 2^16 to 2^20 states.
The LAN host writes chunks at the registry's width, so with vanilla
(or mods within 16 bits) the wire is unchanged. Remote chunks are read
at the server's width, 16 from a vanilla server, and widened to ours.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
What works on main today (install, game files, first run, server.toml, the commands, the web panel,
backups, services, Docker built by hand) and, plainly, what doesn't yet: offline mode only, no
published image, no secure chat or locator bar, the open PRs that are coming. The site renders the
guide into /server at build time, so it has one source. The CSP hashes now cover every page's inline
script, so the privacy page's theme script is allowed too.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Walk and explore passes at 1 to 100 bots on the ThinkPad (bots on the Mac
mini), vanilla with the locator bar off, plus an explore pass at a rate both
servers keep up with. The README has the method, the tables, the profile of
what remains at 25 walking bots and the earlier runs; docs/server.md section
9 and the Scale row summarise it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Block collision scans (vanilla's BlockCollisions) are most of every mob's
move, and moves were the largest share of the world tick with 600 mobs.
Per cell and per hit, the scan did work vanilla's JIT makes cheap:
- the cursor divided its index by the box width and height for every cell;
it now counts x, then y, then z, as Cursor3D does (same cells, same order,
same budget);
- the unit cube test cloned the shared unit cube to compare identities
(`VoxelShape::is_block` compares with it in place), and built a
normalised box to test it against the entity box (`intersects_corners`);
- every non-empty block looked its state up in the contextual rule map
(scaffolding, liquids, powder snow); a flag in the scan table now says
which states have one;
- a moved shape decomposed its occupancy into boxes again; the moved
shape's boxes are its own boxes moved, the same values.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Horizon has no locator bar yet, so equal-work runs turn vanilla's off
(--gamerule locator_bar=false): its waypoint updates cost every move
a pass over every other player.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The bots acknowledge chunk batches with ChunkBatchSizeCalculator's
desired chunks per tick, from how long each batch takes to arrive,
instead of a fixed 25. A bot moves only while it holds the chunk it
stands in, as vanilla's client stops ticking its player in a chunk it
hasn't received, so no bot outruns a server's chunk sending. Each bot
keeps the chunks it holds, so the report separates chunks that entered
its view from chunks sent again while it still held them, and counts
the moves the server refused and the ticks it waited for its chunk.
server_bench.py runs one pass per behaviour (walk, explore), spawns
every bot on the world spawn itself (respawn_radius 0) so both servers
see the same paths, can run the bots on another machine (--bots-via,
--bots-bin, --connect) and the servers under nice, and reports new,
dropped and re-sent chunks per second, pull-backs and the server's
"moved too quickly" lines.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
PlayerChunkSender: one unacknowledged batch until the client's first
acknowledgement and ten after it, batches capped at the client's
desired chunks per tick (not twice that), and the quota reset to one
chunk whenever every batch is acknowledged.
ServerGamePacketListenerImpl.handleMovePlayer: a move further from
where the tick began (firstGood) than 100 blocks squared per move
packet (300 while gliding; the count falls back to 1 past 5 packets)
logs "<name> moved too quickly!" and pulls the player back, as the
player_movement_check and elytra_movement_check game rules allow.
NaN coordinates or non-finite angles and two position moves in one
client tick disconnect with invalid_player_movement, positions are
clamped to the world's limits, an unanswered teleport is sent again
after 20 ticks, and accepting a teleport runs the move it carries.
The move is then replayed against the blocks: a survival or adventure
player who ends more than 0.25 blocks short of the target (horizontally;
vanilla drops the vertical part) logs "<name> moved wrongly!" and is
sent back unless they were already stuck, and any move into a block
the old box did not touch (isEntityCollidingWithAnythingNew) is sent
back silently. Spectators and sleepers skip both. Angles wrap as
Mth.wrapDegrees does.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Resolve minecarts.rs against the resources split (#537): the block model
catalog now lives in self.pack. Fill MobData's new villager_hats and pois
fields in the sulfur cube render test.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Releasing the pointer only ungrabbed it, so the cursor showed up wherever
the system had it: on Wayland, where the locked pointer last stopped (often
where the previous screen was closed), elsewhere wherever the hidden pointer
had drifted. Opening the inventory, a chest, the pause menu, chat, a sign or
a book could put it anywhere.
Game::capture now follows MouseHandler.grabMouse/releaseMouse: both move the
pointer to the window centre, and releasing also sets Horizon's own cursor
(what every screen hit-tests and draws hover with) to that point. On Wayland
the position can only be set as the locked pointer's hint, applied by the
compositor as the lock goes, so it is set before ungrabbing; X11, Windows
and macOS warp, so it is set again once the pointer is free. Releasing an
already released pointer does nothing, so screen-to-screen changes keep the
cursor where it is, as in vanilla, and nothing warps while the window is
unfocused (GLFW's glfwSetCursorPos does the same), so losing focus never
pulls the pointer back into the game.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-10-15 01:12:18 +02:00
905 changed files with 155728 additions and 9741 deletions
A Rust rewrite of Minecraft: Java Edition 26.3 built for one-to-one vanilla parity, checked against the game itself with differential tests.
Every subsystem matches vanilla in all 281 parity harnesses, on Linux and macOS: 100% of what the harnesses compare (see [Project status](#project-status)). The native client is playable on Linux, macOS (Apple Silicon) and Windows.
Horizon is Minecraft: Java Edition 26.3 rewritten in Rust: a native game that reads the same worlds, follows the same rules and generates the same terrain as the Java game, and is checked against it by 281 differential harnesses. You play it through a small launcher, on the files from your own copy of Minecraft. It is free, open source and unofficial.
> Not an official Minecraft product. Not approved by or associated with Mojang or Microsoft. Horizon contains no Minecraft code, assets or data: you need your own legally obtained copy of Minecraft: Java Edition 26.3.
## What changed in v2026.10.13.1
The latest release ([notes](https://github.com/ludovic111/horizon/releases/tag/v2026.10.13.1)):
- **Horizon's own menus:** a new title screen, world list, options and pause menu in the launcher's style, over a live frozen landscape. The vanilla look is still available: Options → Interface → Menu style → Classic.
- **Graphics settings, Simple and Advanced:** presets (Performance, Balanced, Quality, Ultra), or every rendering, quality, display and performance setting, each with a short description and its cost, plus a performance overlay.
- **Much faster rendering:** for example, at render distance 8 over a village, 363 → 2,409 FPS on an RTX 4080. Render distance 32 still stutters in places.
- **Fixed:** no sound on Linux; Linux builds that only ran on the machine they were built on; a missing DLL on Windows (the launcher no longer needs the Visual C++ runtime); memory growing and the frame rate dropping near villages (mobs were duplicated when chunks reloaded); resource preparation failing on Linux with "Missing … java-objc-bridge" ([#41](https://github.com/ludovic111/horizon/issues/41)); the hand and held item at high FOV; missing swing animations.
## Download
Horizon is downloaded only through **the Horizon launcher**: get it from [playhorizon.dev](https://playhorizon.dev) or from [the launcher's releases](https://github.com/ludovic111/horizon/releases?q=launcher-v&expanded=true) (the newest `launcher-v*` release, currently [launcher-v0.1.3](https://github.com/ludovic111/horizon/releases/tag/launcher-v0.1.3)), for Linux x86-64, macOS Apple Silicon or Windows x64. The launcher installs and updates the game, prepares its resources from your own copy of Minecraft, starts the client or a dedicated server, and updates itself.
Horizon is installed through **the Horizon launcher**. Get it from [playhorizon.dev](https://playhorizon.dev) (the Download button picks your system) or from [the launcher releases](https://github.com/ludovic111/horizon/releases?q=launcher-v&expanded=true), for Linux x86-64, macOS on Apple Silicon (Intel Macs from the next release) or Windows x64. The launcher installs and updates the game, prepares its files from your own copy of Minecraft, and updates itself.
**You need** Minecraft: Java Edition installed with the official launcher, with 26.3 played once; Python 3.10 or newer and Java 25 (a JDK, e.g. Eclipse Temurin 25) for the one-time resource preparation; and a GPU with Vulkan on Linux and Windows, or any Apple Silicon Mac.
### The launcher
**You need** Minecraft: Java Edition 26.3, played once (the official launcher, Prism, MultiMC and other launchers all work); a Java 25 JDK, for the one-time preparation; and a GPU with Vulkan on Linux and Windows, or a Mac on macOS 11 or later. Step by step, with macOS's first-open prompt and the first launch: [Install and first launch](https://playhorizon.dev/docs/install).
<table>
<tr>
<td width="50%"><img src="docs/media/launcher-play.webp" alt="The launcher's Play page: v2026.10.14.1 ready to play, its summary, Client and Server, the version picker and Play, the resources and the Minecraft folder as a numbered list"></td>
<td width="50%"><img src="docs/media/launcher-patch-notes.webp" alt="The launcher's Patch notes page, showing the notes of Horizon 2026.10.14.1"></td>
<td width="50%"><img src="docs/media/launcher-play.webp" alt="The launcher's Play page: a version ready to play, its summary, Client and Server, the version picker and Play"></td>
It lists Horizon's releases and installs the build for your platform, shows each release's patch notes, updates Horizon and itself, and doubles as a command-line tool and an MCP server. See [the launcher's README](launcher/README.md).
## What works today
## Screenshots
The [documentation](https://playhorizon.dev/docs/) covers each of these.
Captured in the Rust client itself, with vanilla assets and no mods or shaders.
- **The game:** singleplayer with vanilla's world generation, mobs, villagers, raids, redstone, every command, the HUD and the recipe book, on saves in vanilla's format. Worlds from 1.8 to 26.2 are upgraded as vanilla does. [Status table](#project-status).
- **Horizon's own extras:** new menus (vanilla's are one setting away), graphics presets, distant terrain up to 1024 chunks, controller support, optional zoom, minimap and more, all off by default where they would change the vanilla look. See [Settings](https://playhorizon.dev/docs/settings).
- **Resource packs, shader packs and data packs:** resource packs work, Java shader packs run their full-screen effects (experimental), and data packs load functions, predicates and item modifiers.
- **Playing with others:** invite friends from the pause menu with a code, Open to LAN, and joining offline-mode servers. Horizon cannot sign in to a Microsoft account yet, so it cannot join servers that check accounts. See [Multiplayer](https://playhorizon.dev/docs/multiplayer).
- **Mods:** Horizon has its own mod system (Rust compiled to WebAssembly). Java mod jars do not run. See [Mods and data packs](https://playhorizon.dev/docs/mods).
### Menus and settings
<table>
<tr>
<td colspan="2"><img src="docs/media/menu-title.webp" alt="Horizon's title screen: the mark and the pages on the left, the Horizon title, Singleplayer and Multiplayer, and the last world played and the faint wordmark, over a veiled snowy landscape"></td>
</tr>
<tr>
<td width="50%"><img src="docs/media/menu-worlds.webp" alt="The Singleplayer page: three worlds with their dates and game modes, and Create world and Play buttons"></td>
<td width="50%"><img src="docs/media/settings.webp" alt="The Video settings in their Simple view: a preset, render distance, field of view, framerate, VSync and GUI scale, each with what it costs"></td>
</tr>
</table>
The vanilla menus are one setting away: Options → Interface → Menu style → Classic. See [Graphics settings](docs/graphics.md).
### In game
Screenshots, captured in the Rust client itself with vanilla assets and no mods or shaders:
<table>
<tr>
<td colspan="2"><img src="docs/media/sunset.webp" alt="Sunset over a savanna river valley and a plains village"></td>
</tr>
<tr>
<td width="50%"><img src="docs/media/village.webp" alt="A plains village with farms, an iron golem and animals"></td>
<td width="50%"><img src="docs/media/survival.webp" alt="Survival at dusk: a zombie attacks near the village"></td>
<td width="50%"><img src="docs/media/menu-title.webp" alt="Horizon's title screen over a veiled snowy landscape"></td>
<td width="50%"><img src="docs/media/settings.webp" alt="The Video settings in their Simple view: a preset, render distance, field of view, framerate, VSync and GUI scale, each with what it costs"></td>
</tr>
<tr>
<td width="50%"><img src="docs/media/village.webp" alt="A plains village among savanna hills, with farms, villagers and an iron golem"></td>
<td width="50%"><img src="docs/media/nether.webp" alt="A crimson forest in the Nether with a zombified piglin"></td>
<td width="50%"><img src="docs/media/night.webp" alt="Moonrise over a torch-lit village and river"></td>
</tr>
<tr>
<td width="50%"><img src="docs/media/underwater.webp" alt="Salmon swimming in a river"></td>
<td width="50%" valign="middle">
Vanilla world generation ported to Rust (terrain, aquifers, carvers, features, villages and the Nether), every block model with smooth lighting and biome tints, the vanilla sky and fog, mobs, the HUD, chat and advancements: everything in these frames is drawn by Horizon.
</td>
</tr>
</table>
## What it does
## Host a server
Horizon reimplements the Minecraft Java client and its game logic in Rust, one subsystem at a time, and compares each piece with the vanilla game. Each `tools/test_*_parity.py` harness drives the same inputs through Horizon and through the vanilla client and server bytecode from your own copy of the game, then checks that the outputs are identical. It is for players and developers interested in game reimplementation, and for anyone who wants to see how far a behaviour-exact native rewrite can go.
The launcher's **Servers** page creates, starts, backs up and updates a Horizon server with buttons, and invites friends over Tailscale. On a VPS, `horizon-server` installs with one command and runs without Java. Guide: [Host a server](https://playhorizon.dev/docs/hosting) ([reference](docs/hosting.md)).
The [native client](docs/native-client.md) opens on a vanilla-style title screen with world creation and selection, and generates worlds with the Rust port of the vanilla generators: noise terrain, aquifers, surface rules, carvers and placed features, all checked against vanilla. It streams and lights chunks on worker threads and renders every vanilla block model with smooth lighting, biome tints, the vanilla sky, sun, moon, stars and clouds. Gameplay includes:
## Modpacks
- validated player physics, health and hunger;
- mining with vanilla tool rules and loot tables;
- placing, crafting, chests and furnaces;
- dropped items, particles and sounds;
- passive and hostile mobs with combat and vanilla AI, including guardians, shulkers, illagers, ravagers, the wither, the ender dragon fight, the breeze, the creaking, the sniffer, the happy ghast, llamas and the copper golem;
- villagers that take jobs, trade, restock, meet at the bell and sleep in beds, on a port of vanilla's brain;
- raids and pillager patrols;
- dispensers, crafters, the loom and the recipe book;
- every command, scoreboards and teams, the player list, subtitles and the HUD overlays;
- boats, minecarts, item frames, paintings and armor stands;
- shields, maps, books, fireworks, beacons, advancements and statistics;
- Anvil saves, joining vanilla servers, and opening a world to LAN.
The launcher's **Modpacks** page imports a Modrinth or CurseForge pack, shows which of its mods Horizon can carry over, and plays the ones it can as their own profile. Today that means content mods made of data and assets; mods with Java code are not ported yet. See [Modpacks](https://playhorizon.dev/docs/modpacks).
## Agent control
@@ -147,7 +107,18 @@ cargo run --release -p horizon-client
Everything prepared lands in the gitignored `.local/`. It is derived from the game: never commit it or share it.
The client starts on the title screen. Command-line options (`--world`, `--seed`, `--creative`, `--render-distance`, `--dedicated`), controls, playing and scripting through `horizon-ctl` and its MCP server, and the architecture are described in [the native client guide](docs/native-client.md). The rest of the documentation is indexed in [docs/README.md](docs/README.md), including [the parity workflow](docs/parity-workflow.md).
The client starts on the title screen. Command-line options (`--world`, `--seed`, `--creative`, `--render-distance`, `--dedicated`), controls, scripting through `horizon-ctl` and the architecture are described in [the native client guide](docs/native-client.md). The rest of the developer documentation is indexed in [docs/README.md](docs/README.md), including [the parity workflow](docs/parity-workflow.md).
## Contributing
Issues and pull requests are welcome: see [CONTRIBUTING.md](CONTRIBUTING.md) for how we work (vanilla first, small pull requests, labels), or [the contributing guide](https://playhorizon.dev/docs/contributing) on the site. Questions and ideas: [Discord](https://discord.gg/HcTeMZxe5E). Before opening a pull request, run the self-check and paste the block it prints:
```sh
git config core.hooksPath .githooks
python3 tools/pr_ready.py
```
It runs rustfmt, clippy with warnings denied, the tests of the crates you touched, the Python tests, the public-tree check, and the vanilla harnesses your change can affect. CI runs the same checks on GitHub's Linux runners; the vanilla harnesses need the game, which Horizon never downloads, so they run on a maintainer's computer holding their own copy. Never commit game files, decompiled source or prepared resources: `tools/check_public_tree.py` rejects them, and tracked Java is allowed only under the project's own `dev/horizonlab` namespace.
## Project status
@@ -182,18 +153,7 @@ them too (Rust uses Java's own float maths on each platform).
### Known issues
Online-mode servers (Mojang's session servers) are not supported; skins served over https show the default skin unless already cached; pack icons show the unknown-pack texture in game; the creative hotbar keys (C/X) aren't wired to the hotbar loader; item tooltips lack attribute lines.
## Contributing
Issues and pull requests are welcome: see [CONTRIBUTING.md](CONTRIBUTING.md) for how we work (vanilla first, small pull requests, labels). Before opening a pull request, run the self-check and paste the block it prints:
```sh
git config core.hooksPath .githooks
python3 tools/pr_ready.py
```
It runs rustfmt, clippy with warnings denied, the tests of the crates you touched, the Python tests, the public-tree check, and the vanilla harnesses your change can affect. CI runs the same checks on GitHub's Linux runners; the vanilla harnesses need the game, which Horizon never downloads, so they run on a self-hosted runner holding the maintainer's own copy. Never commit game files, decompiled source or prepared resources: `tools/check_public_tree.py` rejects them, and tracked Java is allowed only under the project's own `dev/horizonlab` namespace.
Horizon can't sign in to a Microsoft account yet, so it can't join online-mode servers (it joins offline-mode ones); skins served over https show the default skin unless already cached; pack icons show the unknown-pack texture in game; the creative hotbar keys (C/X) aren't wired to the hotbar loader; item tooltips lack attribute lines.
| 100 | Vanilla | stopped by its watchdog (a 60 s tick) | | | | | | | | 15.1 / 120 |
Both servers sent each walking bot the same number of distinct chunks over the whole run (680–690). Horizon's
"new chunks/s" inside the measured window is lower, so compare the totals, not that column.
### `explore` at full speed: unequal work
Bots fly outwards as fast as chunks arrive (`horizon-bots`' default, up to 22 blocks a second). Both servers now pull them back ("moved too quickly"), but Horizon sends
more new terrain, so this pass doesn't compare equal work. The server-machine load of Horizon's 1-bot run is
estimated from the time between the runs around it: its log was overwritten before it was read.
| Bots | Server | MSPT | P95 | TPS | RSS | CPU | Chunks/s | New chunks/s | Pulled back | Load (server / bots) |
"engine":"horizon-engine: the server build of #916 (horizon-client --no-default-features) at 519ec121, as install.sh --archive installed it",
"java":[
"openjdk 25.0.4.1 2026-08-18"
],
"settings":{
"servers":"horizon,vanilla",
"bots":"1,10,25,50",
"behaviour":"mixed",
"join_every":1.0,
"warmup":300,
"seconds":300,
"seed":12345,
"explore_speed":0.8,
"gamerule":"",
"heap":"4g",
"nice":19,
"bots_via":"ssh macmini",
"connect":"the ThinkPad's tailnet address",
"properties":{
"level-seed":"12345",
"view-distance":"10",
"simulation-distance":"10",
"online-mode":"false",
"white-list":"false",
"gamemode":"creative",
"force-gamemode":"true",
"spawn-protection":"0",
"max-players":"200",
"difficulty":"easy",
"sync-chunk-writes":"true"
}
},
"note":"server_bench.py was stopped after vanilla's 50-bot server crashed, before it wrote this file; the runs are the lines it printed, and the vanilla 50 entry is taken from that server's log.",
"runs":[
{
"server":"horizon",
"bots":1,
"behaviour":"mixed",
"start_seconds":19.73,
"mspt":{
"average":1.77,
"p50":1.34,
"p95":4.21,
"p99":13.04
},
"mspt_worst_p99":47.5,
"tps":20.0,
"rss_mb":{
"mean":686.54,
"max":686.7
},
"cpu_percent":27.92,
"chunks_per_second":9.94,
"unique_per_second":0.01,
"forgotten_per_second":9.9,
"waited_ticks_per_second":0.0,
"chunks_total":6092,
"chunks_per_bot":{
"walk":6092.0
},
"unique_chunks_per_bot":{
"walk":699.0
},
"resent":0,
"pulled_back":0,
"moved_too_quickly":0,
"moved_wrongly":0,
"bots_joined":1,
"bots_failed":[],
"tick_queries":58
},
{
"server":"vanilla",
"bots":1,
"behaviour":"mixed",
"start_seconds":20.45,
"mspt":{
"average":11.34,
"p50":10.6,
"p95":17.12,
"p99":33.22
},
"mspt_worst_p99":119.1,
"tps":20.0,
"rss_mb":{
"mean":3404.16,
"max":3416.3
},
"cpu_percent":35.93,
"chunks_per_second":9.98,
"unique_per_second":0.01,
"forgotten_per_second":9.93,
"waited_ticks_per_second":0.0,
"chunks_total":6084,
"chunks_per_bot":{
"walk":6084.0
},
"unique_chunks_per_bot":{
"walk":699.0
},
"resent":0,
"pulled_back":0,
"moved_too_quickly":0,
"moved_wrongly":0,
"bots_joined":1,
"bots_failed":[],
"tick_queries":59
},
{
"server":"horizon",
"bots":10,
"behaviour":"mixed",
"start_seconds":19.54,
"mspt":{
"average":4.74,
"p50":3.83,
"p95":10.48,
"p99":19.69
},
"mspt_worst_p99":120.1,
"tps":20.0,
"rss_mb":{
"mean":855.26,
"max":882.7
},
"cpu_percent":29.78,
"chunks_per_second":61.35,
"unique_per_second":1.79,
"forgotten_per_second":61.47,
"waited_ticks_per_second":0.0,
"chunks_total":40762,
"chunks_per_bot":{
"walk":6247.67,
"explore":1165.0,
"idle":473.0
},
"unique_chunks_per_bot":{
"walk":701.83,
"explore":1086.0,
"idle":473.0
},
"resent":0,
"pulled_back":4159,
"moved_too_quickly":0,
"moved_wrongly":0,
"bots_joined":10,
"bots_failed":[],
"tick_queries":58
},
{
"server":"vanilla",
"bots":10,
"behaviour":"mixed",
"start_seconds":19.95,
"mspt":{
"average":34.3,
"p50":32.2,
"p95":53.72,
"p99":89.08
},
"mspt_worst_p99":375.8,
"tps":20.0,
"rss_mb":{
"mean":3713.5,
"max":3754.9
},
"cpu_percent":128.07,
"chunks_per_second":61.66,
"unique_per_second":1.93,
"forgotten_per_second":61.71,
"waited_ticks_per_second":0.0,
"chunks_total":37568,
"chunks_per_bot":{
"walk":5729.0,
"explore":1124.0,
"idle":473.0
},
"unique_chunks_per_bot":{
"walk":701.17,
"explore":1055.0,
"idle":473.0
},
"resent":0,
"pulled_back":3976,
"moved_too_quickly":20,
"moved_wrongly":0,
"bots_joined":10,
"bots_failed":[],
"tick_queries":58
},
{
"server":"horizon",
"bots":25,
"behaviour":"mixed",
"start_seconds":9.61,
"mspt":{
"average":11.72,
"p50":9.88,
"p95":24.45,
"p99":43.79
},
"mspt_worst_p99":129.8,
"tps":20.0,
"rss_mb":{
"mean":947.35,
"max":1086.1
},
"cpu_percent":57.83,
"chunks_per_second":158.57,
"unique_per_second":5.78,
"forgotten_per_second":158.45,
"waited_ticks_per_second":0.0,
"chunks_total":108126,
"chunks_per_bot":{
"walk":6628.53,
"explore":1266.6,
"idle":473.0
},
"unique_chunks_per_bot":{
"walk":704.67,
"explore":1189.2,
"idle":473.0
},
"resent":0,
"pulled_back":3496,
"moved_too_quickly":0,
"moved_wrongly":0,
"bots_joined":25,
"bots_failed":[],
"tick_queries":58
},
{
"server":"vanilla",
"bots":25,
"behaviour":"mixed",
"start_seconds":37.78,
"mspt":{
"average":50.45,
"p50":46.39,
"p95":74.09,
"p99":191.21
},
"mspt_worst_p99":1388.1,
"tps":19.82,
"rss_mb":{
"mean":3866.18,
"max":4745.0
},
"cpu_percent":192.42,
"chunks_per_second":157.63,
"unique_per_second":8.25,
"forgotten_per_second":156.12,
"waited_ticks_per_second":0.0,
"chunks_total":88763,
"chunks_per_bot":{
"walk":5387.0,
"explore":1118.6,
"idle":473.0
},
"unique_chunks_per_bot":{
"walk":699.0,
"explore":1075.0,
"idle":473.0
},
"resent":2,
"pulled_back":3629,
"moved_too_quickly":296,
"moved_wrongly":0,
"bots_joined":25,
"bots_failed":[],
"tick_queries":58
},
{
"server":"horizon",
"bots":50,
"behaviour":"mixed",
"start_seconds":14.93,
"mspt":{
"average":23.82,
"p50":20.11,
"p95":50.98,
"p99":74.64
},
"mspt_worst_p99":195.9,
"tps":20.0,
"rss_mb":{
"mean":1031.41,
"max":1201.2
},
"cpu_percent":98.21,
"chunks_per_second":302.81,
"unique_per_second":10.96,
"forgotten_per_second":303.47,
"waited_ticks_per_second":0.0,
"chunks_total":212181,
"chunks_per_bot":{
"walk":6496.53,
"explore":1255.5,
"idle":473.0
},
"unique_chunks_per_bot":{
"walk":701.9,
"explore":1184.7,
"idle":473.0
},
"resent":0,
"pulled_back":7565,
"moved_too_quickly":0,
"moved_wrongly":0,
"bots_joined":50,
"bots_failed":[],
"tick_queries":58
},
{
"server":"vanilla",
"bots":50,
"behaviour":"mixed",
"start_seconds":11.16,
"error":"stopped by its watchdog 30 s after the last bot joined: \"A single server tick took 60.01 seconds (should be max 0.05)\" (Player.tick)"
| 100 | Vanilla | stopped by its watchdog | | | | | | |
Vanilla's watchdog stopped it at 50 bots (in `ClientboundLightUpdatePacketData`, copying light for a chunk
packet) and at 100 (in `Entity.move` from a move packet).
## Findings
- Horizon's RSS is 1.9 to 2.6 times smaller in every run, and it starts in 11 s against vanilla's 15 s.
Vanilla's heap is fixed at 4 GB (`-Xms4g`), so part of its RSS is that setting rather than need.
- With 1 bot Horizon's tick is 3.3 times shorter walking and 4.5 times shorter exploring at equal work;
at 10 bots it is still shorter in both.
- At equal exploring work Horizon's tick is about half of vanilla's at 10 and 25 bots.
- When the bots only fly around spawn (`walk`), vanilla's tick hardly grows with players (16 to 20 ms from
1 to 50 bots) while Horizon's grows by about 0.5 ms per bot, so vanilla is ahead from about 20 bots: 16.0
against 20.7 ms at 25 and 20.5 against 31.4 ms at 50. Both keep 20 TPS up to 50.
- With 100 bots vanilla's watchdog stops it in every pass, and Horizon keeps running at 9 to 11 TPS.
### Where Horizon's walk tick goes at 25 bots
Profiled on the ThinkPad with `perf` (the server thread, 20 s, self time):
| Share | What | Whose |
|---:|---|---|
| 18 % | `Streaming::update`: every tick it walks all loaded columns and proto chunks and tests each against every player's area (unloading, dropping protos, finishing and decoration candidates), so the cost grows with players times chunks | streaming / engine tick |
| 20 % | `PalettedContainer::get` and `World::block`, mostly from block entity ticks: on the Mac profile `tick_hoppers` looks up the block under every block entity in the loaded world each tick and compares names as strings, and spawners rebuild their display id | engine tick |
| 8 % | `light_data` when a chunk is sent: the light layers were built twice per chunk; a follow-up commit on #623 builds them once and keeps each section's packed layers | server (this work) |
| 7 % | encoding chunk sections and heightmaps for the chunks each bot newly sees | server |
| 4 % | `Hub::tick` (moves, tracking) | server |
| 2 % | the moved-wrongly collision check | server |
The first two grow with the number of players but aren't specific to the server: they are the
engine's tick and streaming, reported to perf-server-2. Before #623 and #649, encoding every chunk section
once per player and waking each connection's writer thread once per packet cost more than everything above
(at 50 walking bots the tick was 281 ms; see the earlier runs).
## Earlier runs (same machine and method)
-`run-1-before-chunk-cache.json`: before #623, with vanilla's locator bar on. Horizon's walk tick was
27.5, 40.7, 281 and 467 ms at 10, 25, 50 and 100 bots, and vanilla's 33.2 ms at 50 (the locator bar).
-`run-2-chunk-cache.json`: Horizon with #623 only: 13.2, 23.5, 31.4 and 84.4 ms walking at 10 to 100
bots.
## Files
-`horizon.json`, `vanilla.json`: the walk and explore passes (vanilla with `locator_bar=false`).
-`explore-equal-rate.json`: the explore pass at 0.8 blocks a second, both servers.
-`run-1-before-chunk-cache.json`, `run-2-chunk-cache.json`: the earlier runs.
To run it again (bots on another machine reached at `--connect`):
cmd!("ui",Screens,"ui","every widget of the open screen: id, kind, label, bounds, value",
"Kinds: button, slider (value 0..1), field, row (worlds, servers, packs, languages), tab (selected), slot (slot-ID, with its stack). Ids come from labels (\"FOV: 70\" is fov, a repeat gets -2) or kind-N without one, and stay put when a value changes. Reflects the last drawn frame (frame counts them).",
["horizon-ctl ui"],&[],mcp: true,local: false),
cmd!("click",Screens,"click ID [right] [shift]","click a widget of ui by its id, as the mouse would",
"A field takes focus (then type); slot-ID clicks a slot like click-slot.",
cmd!("click",Screens,"click ID [right|middle] [shift]","click a widget of ui by its id, as the mouse would",
"A field takes focus (then type); slot-ID clicks a slot like click-slot. middle presses the middle button (pick block: a creative player clones the stack).",
&[p("id",Ty::Str,"widget id from ui"),opt("right",Ty::Bool,"right-click"),opt("shift",Ty::Bool,"shift-click (slots)")],mcp: true,local: false),
&[p("id",Ty::Str,"widget id from ui"),opt("right",Ty::Bool,"right-click"),opt("middle",Ty::Bool,"middle-click"),opt("shift",Ty::Bool,"shift-click (slots)")],mcp: true,local: false),
cmd!("set",Screens,"set ID VALUE","move a slider of ui to VALUE (0..1), as a click on its track",
"The option behind it rounds to its own steps; read the new label with ui.",
["horizon-ctl set fov 0.5","horizon-ctl set render-distance 0"],
cmd!("bench",Scripting,"bench SECONDS","reset frame stats, wait, reply with the summary","",["horizon-ctl bench 10"],&[],mcp: false,local: false),
cmd!("stats",Scripting,"stats [reset]","frame-time summary since the last reset","",["horizon-ctl stats"],&[],mcp: false,local: false),
cmd!("fly",Scripting,"fly X1 Y1 Z1 X2 Y2 Z2 SECONDS [PITCH [raw]]","fly the camera along a line, then reply with the frame summary",
"With raw, the reply also lists every frame time in milliseconds (frame_ms).",
"The reply's tick_ms and tick_ms_max are the world's smoothed tick time over the flight (the server thread's when single player runs on one). With raw, the reply also lists every frame time in milliseconds (frame_ms).",
"instructions": "Play Horizon, a Rust reimplementation of Minecraft Java Edition. Start with launch (it finds the game installed by the Horizon launcher and opens or creates a world), then read the world with state, inventory, screen, entities and find_block, and act with goto, look_at_block, break, place, interact, click_slot and click_button. Actions block until they finish and report what happened. Coordinates are block coordinates; yaw 0 faces south (+Z).",
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Ludovic Marie