Dynamic Surroundings (Expanded) Mixins

Dynamic Surroundings (Expanded) Mixins

A Mixin patch mod for Dynamic Surroundings (Expanded) (CurseForge) that fixes its failure to properly recognize tool/weapon sound effects from certain mods on Minecraft Forge 1.20.1.

Patches are injected at runtime via Mixin.

Core Features

• Fixes missing switching sounds and sword hum sounds for tools/weapons from mods like Tinkers’ Construct 3.
• Specifically: lets Dynamic Surroundings correctly classify items as sword / axe / tool… based on item tags (e.g. #minecraft:swords) instead of relying only on class inheritance.

Root Cause

• Dynamic Surroundings’ ItemLibrary#resolveClassType() determines item type using only instanceof against vanilla item classes — it never uses item tags (#minecraft:swords, etc.).
• Tinkers’ Construct 3 swords inherit as (roughly):

ModifiableSwordItem → ModifiableItem → TieredItem

• They are not SwordItem, but TieredItem. Thus:

• So Tinkers’ swords appear silent — they were simply misclassified as tools.

In fact, Dynamic Surroundings already defines these tags (ItemEffectTags.SWORDS, etc., and effects/swords.json mapped to #minecraft:swords / #c:swords) — it just forgot to use them in resolveClassType.

The Fix

A Mixin is injected at the HEAD of ItemLibrary#resolveClassType, applying tag-based classification before the instanceof check (preemptive interception):

1. When the method is called, the tag check runs first.
2. Tag matches → setReturnValue returns the correct type immediately; the original instanceof logic is skipped.
3. No tag match → nothing happens; the original instanceof logic runs unchanged.

Therefore:

• Vanilla items behave identically (tag result matches instanceof).
• Items like Tinkers’ (TieredItem but carrying #minecraft:swords) are correctly classified as swords.
• All other Dynamic Surroundings features (books, potions, ambient/environment, footsteps, etc.) are unaffected.

Extra Patches

• The original mod’s effects/tools.json omitted #minecraft:pickaxes, so pickaxes weren’t recognized as tools. This mod adds a direct stack.is(ItemTags.PICKAXES) check against the vanilla tag to fix that.
• The original ItemSwingEffect#tick hard-coded the main hand (getItemInHand(MAIN_HAND)), so off-hand swings couldn’t fetch the off-hand weapon and produced no sword hum. This mod uses @ModifyVariable to instead fetch the item via entity.swingingArm (main-hand behavior unchanged).

Features

• Fixes tool/weapon switch sounds and sword hum for mods like Tinkers’ Construct 3
• Mixin-based patching
• Zero impact on vanilla item behavior
• Compatible with data/resource packs: add tags like #minecraft:swords to extend classification
• Client-side only (clientSideOnly)

Dependencies