124 lines
4.5 KiB
Markdown
124 lines
4.5 KiB
Markdown
# Retail item useability and AutoWear rejection
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Date: 2026-07-23
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## Retail anchors
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- `ItemUses::ItemUses @ 0x004FCCB0`
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- `ItemUses::IsUseable @ 0x004FCCC0`
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- `PublicWeenieDesc::Reset @ 0x005ACC70`
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- `PublicWeenieDesc::UnPack @ 0x005AD470`
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- `ItemHolder::DetermineUseResult @ 0x00588460`
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- `ItemHolder::UseObject @ 0x00588A80`
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- `CPlayerSystem::UsingItem @ 0x00562F70`
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- `CPlayerSystem::AutoWearIsLegal @ 0x0055EF40`
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- `CPlayerSystem::AutoWear @ 0x005601C0`
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- `ACCWeenieObject::GetObjectAtLocation @ 0x0058CE00`
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The named pseudo-C is the behavioral oracle. The matching v11.4186 binary was
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also inspected because an older project note interpreted
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`ItemUses::IsUseable` as a nonzero test. The actual instructions are:
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```text
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004fccc0 mov eax,[ecx]
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004fccc2 not eax
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004fccc4 and eax,1
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004fccc7 ret
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```
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Therefore the method tests only `USEABLE_NO` (bit zero). A zero-valued
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`ITEM_USEABLE` is usable; `USEABLE_NEVER_WALK` is a movement modifier and does
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not make the object unusable. The literal AutoWear rejection at `0x007CC868`
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is:
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```text
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You must remove your %s to wear that
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```
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The staged ACE, holtburger, and ACViewer reference directories are currently
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empty in this checkout. Their established roles were still checked: ACE owns
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the authoritative use/wield outcome, while the two client references do not
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replace the retail UI-side legality and notice oracle. No server behavior is
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being inferred or moved client-side here.
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## Pseudocode
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```text
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ItemUses.IsUseable():
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return (useableBitfield & USEABLE_NO) == 0
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```
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`PublicWeenieDesc::Reset` zeros the useability field. `UnPack` replaces it only
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when the optional useability word is present. Consequently an absent wire word
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and an explicitly packed zero both have retail `USEABLE_UNDEF` value zero and
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both pass `IsUseable`.
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For a direct-use item, `ItemHolder::UseObject` then sends
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`CM_Inventory::Event_UseEvent`, increments the UI busy count, and calls
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`CPlayerSystem::UsingItem`. That latter presentation function handles local
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pickup/wield/container state; it does not require a carried source to have a
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world position. Therefore an owned inventory object must cross the wire
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directly. Only world objects participate in acdream's registered AD-27 local
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approach compatibility seam.
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```text
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AutoWearIsLegal(itemId, out alreadyWorn, silent):
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alreadyWorn = false
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if player is not ready for an inventory request:
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return false
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item = GetWeenieObject(itemId)
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if item is null:
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return false
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if (item.validLocations & 0x08007FFF) == 0:
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return false
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if (item.priority & playerSystem.clothingPriorityMask) == 0:
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return true
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player = GetWeenieObject(playerId)
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if player contains item at a worn location:
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alreadyWorn = true
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if not silent:
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if alreadyWorn:
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display "The <item appropriate name> is already being worn"
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else:
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occupied = playerSystem.inventoryMask & item.validLocations
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blocker = player.GetObjectAtLocation(occupied, item.priority)
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if blocker exists:
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display "You must remove your <blocker appropriate name> to wear that"
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return false
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```
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```text
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AutoWear(itemId, out alreadyWorn, silent):
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if not AutoWearIsLegal(itemId, alreadyWorn, silent):
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return false
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item = GetWeenieObject(itemId)
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if item exists:
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item.UIAttemptWield(item.validLocations)
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return true
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```
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## Port boundary
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- `ItemUseability.IsUseable` is the one Core implementation of the low-bit
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rule. Toolbar enablement, item activation, and world interaction consume it.
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- `ItemInteractionController` remains the shared double-click and toolbar-hand
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path. A zero-valued carried gem such as Blackmoor's Favor therefore emits the
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ordinary Use request directly from its inventory identity; it is never sent
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through the world-approach query. ACE remains authoritative for its spell
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and consumption outcome.
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- `SelectionInteractionController` keeps the AD-27 turn/approach seam only for
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non-owned spatial objects. Owned self, equipped, and nested-container sources
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have no live world pose and send immediately.
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- `AutoWieldController` remains the shared inventory/paperdoll equip owner. It
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resolves AutoWear blockers from `ClientObjectTable`'s retail-ordered
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equipment projection and emits the retail literal through system chat.
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- Weapon replacement is unchanged. Retail automatically moves primary weapon,
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incompatible shield, and incompatible ammunition blockers, while AutoWear
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rejects overlapping clothing/armor and tells the player what to remove.
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