Litematica Container Filler (Backport for 1.20.1)

A Minecraft 1.20.1 Fabric port of Litematica Container Filler with performance optimizations and stability improvements.

What's Different from the Original

This is a backport of the original mod to Minecraft 1.20.1 Fabric. Key improvements over the upstream:

• Rendering overhaul — Replaced the VertexBuffer-based cache architecture with immediate-mode rendering, fixing 3D camera rotation issues on 1.20.1
• Split-frame highlight scanning — Highlight scanning is now spread across multiple frames (HighlightScanPass) to eliminate single-frame performance spikes
• Highlight render cache — Introduced a render cache to reduce redundant draw calls; highlight budget is configurable
• Async PCA queue — PCA sync and region scanning are now fully async; removed MiniHUD reflection cache for better responsiveness
• Configurable cache TTL — Cache capacity and time-to-live are now user-configurable, with a GUI cache status monitor
• Accurate item routing — Improved item transport path calculation for container filling
• Pre-fill block validation — Validates the real block state before filling to prevent mismatches
• UI timeout diagnostics — Automatic diagnostics when container data requests time out, making troubleshooting easier
• Configurable interaction distance — Adjust player interaction range to suit different server environments
• Categorized debug logging — Structured debug log system with performance hotspot timing
• Queued PCA requests — PCA requests are now queued with timeout and retry cooldown for improved stability
• PCA compatibility wrapper — PCA receiver is wrapped for compatibility with other mods using the PCA protocol

Main Features

Schematic Container Filling

• Fills real containers according to the container NBT and slot layout stored in the Litematica schematic.
• One-shot filling: look at a target container and press the fill hotkey.
• Work State: continuously scans nearby containers, queues valid tasks, and fills them automatically.
• Crafter slot locking: even if materials are missing, the mod still prioritizes required slot locks.
• Handles double chests as one connected container.
• Supports Carpet largeBarrels (must be enabled manually in config).
• Configurable fill radius, action delay, safety delay, and state protection.

Container State Highlights

Renders container status directly in the 3D world:

• Unfilled / Partial / Satisfied / Overfilled
• Wrong item / Unknown data / Unplaced container
• Manually completed / Manually needs fill

The renderer uses translucent bodies, top plates, and animated 3D task markers. Containers being filled, queued containers, and missing-material events each have separate animated markers.

Highlight colors, opacity, task markers, animation FPS limits, render radius, and per-state toggles are all configurable. X-ray highlights are disabled by default.

Item Replacement

Item replacement affects actual filling behavior, not only the material list display:

• Supports global replacement rules and per-schematic rules (per-schematic takes priority).
• Visual replacement picker.
• Supports exact item data: custom names, enchantments, and data components.
• Format: minecraft:stone->minecraft:cobblestone
• Custom-name matching: minecraft:paper#slot1->minecraft:iron_ingot
• Replacing an item with minecraft:air makes the filler ignore that item.

Material List Integration

• Show only building blocks / only container items / both together.
• Open the replacement picker directly from the material list.
• Replacement markers and tooltips for replaced items.
• Collect missing material-list items from the container you are looking at.

Inventory & Shulker Logistics

• Extracts required items from shulker boxes in the player inventory.
• Supports QuickShulker.
• Supports the TakeItOut server-side protocol.
• Shulker boxes with different colors are treated as compatible if their contents match.
• Orderly item storage: items are returned to source shulkers or matching shulkers first when space is needed.
• Slow click packet mode for plugin-heavy or stricter anti-cheat servers.

Container Tools

Independent look-at-container tools:

• Clear Container — clears the target container. Output can be dropped, moved to inventory, or both.
• Fill Full — fills the target container with an unambiguous item from your inventory.
• Sync Container — reads a template container and syncs other targets to the same layout.
• Container Packing — packs items from the target container into shulker boxes in your inventory.
• Collect Materials — collects missing Litematica material-list items from the target container.

Tools support next/previous switching, closing all tools, hold-to-repeat, same-container cooldowns, and an optional tool HUD.

Container Filter

• Disabled / Whitelist / Blacklist modes.
• Apply the filter to schematic filling, container tools, or both.
• Visual container picker.
• Wildcard rules: minecraft:*_shulker_box
• Auto-detects modded containers via block entities, inventory interfaces, and common container-like block IDs.

Manual Container Marks

Manually cycle container state:

• Automatic / Manually completed / Manually needs fill

Works on containers outside the current schematic range.

Usage

• Default config hotkey: L + C
• Default one-shot fill hotkey: V
• For continuous filling, enable Work State in the config, bind a hotkey, and adjust the fill radius and action delay.

Dependencies

Required:

• Fabric Loader
• Fabric API
• MaLiLib
• Litematica

Optional:

• Mod Menu — config screen access
• QuickShulker — fast inventory shulker opening and extraction
• PCA — fetch real container data without opening containers
• MiniHUD — the mod may read its container preview cache
• TakeItOut — server-side shulker extraction support

Notes & Warnings

Server risk: Automated container operations may be flagged by server plugins or anti-cheat systems as abnormal clicking or auto-sorting. Increase the action delay or enable slow click packet mode if needed.

Empty-schematic container clearing: If enabled, the mod may remove items from real containers that are empty in the schematic. Verify your schematic and range before enabling.

Carpet large barrels: Only enable this if the server actually runs Carpet with largeBarrels enabled.

License

This project is licensed under LGPL-3.0-only.