New science unlock: the H.A.R.M.P.A.C.K (#38824)

Content.Shared/Hands/Components/ExtraHandsEquipmentComponent.cs

@@ -0,0 +1,18 @@
+using Robust.Shared.GameStates;
+using Content.Shared.Hands.EntitySystems;
+
+namespace Content.Shared.Hands.Components;
+
+/// <summary>
+/// An entity with this component will give you extra hands when you equip it in your inventory.
+/// </summary>
+[RegisterComponent, NetworkedComponent]
+[Access(typeof(ExtraHandsEquipmentSystem))]
+public sealed partial class ExtraHandsEquipmentComponent : Component
+{
+    /// <summary>
+    /// Dictionary relating a unique hand ID corresponding to a container slot on the attached entity to a struct containing information about the Hand itself.
+    /// </summary>
+    [DataField]
+    public Dictionary<string, Hand> Hands = new();
+}

Content.Shared/Hands/EntitySystems/ExtraHandsEquipmentSystem.cs

@@ -0,0 +1,43 @@
+using Content.Shared.Hands.Components;
+using Content.Shared.Inventory.Events;
+
+namespace Content.Shared.Hands.EntitySystems;
+
+public sealed class ExtraHandsEquipmentSystem : EntitySystem
+{
+    [Dependency] private readonly SharedHandsSystem _hands = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<ExtraHandsEquipmentComponent, GotEquippedEvent>(OnEquipped);
+        SubscribeLocalEvent<ExtraHandsEquipmentComponent, GotUnequippedEvent>(OnUnequipped);
+    }
+
+    private void OnEquipped(Entity<ExtraHandsEquipmentComponent> ent, ref GotEquippedEvent args)
+    {
+        if (!TryComp<HandsComponent>(args.Equipee, out var handsComp))
+            return;
+
+        foreach (var (handName, hand) in ent.Comp.Hands)
+        {
+            // add the NetEntity id to the container name to prevent multiple items with this component from conflicting
+            var handId = $"{GetNetEntity(ent.Owner).Id}-{handName}";
+            _hands.AddHand((args.Equipee, handsComp), handId, hand.Location);
+        }
+    }
+
+    private void OnUnequipped(Entity<ExtraHandsEquipmentComponent> ent, ref GotUnequippedEvent args)
+    {
+        if (!TryComp<HandsComponent>(args.Equipee, out var handsComp))
+            return;
+
+        foreach (var handName in ent.Comp.Hands.Keys)
+        {
+            // add the NetEntity id to the container name to prevent multiple items with this component from conflicting
+            var handId = $"{GetNetEntity(ent.Owner).Id}-{handName}";
+            _hands.RemoveHand((args.Equipee, handsComp), handId);
+        }
+    }
+}

Resources/Locale/en-US/research/technologies.ftl

@@ -39,6 +39,7 @@ research-technology-kinetic-modifications = Kinetic Modifications
 research-technology-basic-shuttle-armament = Shuttle Basic Armament
 research-technology-advanced-shuttle-weapon = Advanced Shuttle Weapons
 research-technology-thermal-weaponry = Thermal Weaponry
+research-technology-dual-wielding-technology = Dual Wielding Technology
 
 research-technology-basic-robotics = Basic Robotics
 research-technology-basic-anomalous-research = Basic Anomalous Research

Resources/Prototypes/Entities/Clothing/Back/specific.yml

@@ -98,3 +98,25 @@
   - type: Construction
     graph: ClothingBagPet
     node: bagPet
+
+- type: entity
+  parent: Clothing
+  id: ClothingBackpackHarmpack
+  name: H.A.R.M.P.A.C.K.
+  description: Now you can reload, punch, and eat a snack - simultaneously.
+  components:
+  - type: Sprite
+    sprite: Clothing/Back/Specific/harmpack.rsi
+    state: icon
+  - type: Item
+    size: Ginormous
+  - type: Clothing
+    slots: BACK
+  - type: ExtraHandsEquipment
+    hands:
+      # middle hands to prevent overlapping inhand sprites
+      # This can be changed once we have per-hand displacement maps
+      extra_hand_1:
+        location: Middle
+      extra_hand_2:
+        location: Middle

Resources/Prototypes/Recipes/Lathes/Packs/science.yml

@@ -30,6 +30,7 @@
   - SignallerAdvanced
   - DeviceQuantumSpinInverter
   - DeviceDesynchronizer
+  - ClothingBackpackHarmpack
 
 - type: latheRecipePack
   id: ScienceClothing

Resources/Prototypes/Recipes/Lathes/Packs/security.yml

@@ -75,6 +75,7 @@
   - PowerCageMedium
   - PowerCageSmall
   - TelescopicShield
+  - ClothingBackpackHarmpack
 
 - type: latheRecipePack
   id: SecurityBoards

Resources/Prototypes/Recipes/Lathes/security.yml

@@ -84,6 +84,18 @@
     Plasma: 500
     Glass: 500
 
+- type: latheRecipe
+  id: ClothingBackpackHarmpack
+  result: ClothingBackpackHarmpack
+  categories:
+  - Clothing
+  completetime: 15
+  materials:
+    Steel: 2000
+    Plastic: 1000
+    Plasma: 500
+    Gold: 500
+
 # Shields
 - type: latheRecipe
   parent: BaseShieldRecipe

Resources/Prototypes/Research/arsenal.yml

@@ -191,6 +191,18 @@
   technologyPrerequisites:
   - SalvageWeapons
 
+- type: technology
+  id: DualWieldingTechnology
+  name: research-technology-dual-wielding-technology
+  icon:
+    sprite: Clothing/Back/Specific/harmpack.rsi
+    state: icon
+  discipline: Arsenal
+  tier: 2
+  cost: 10000
+  recipeUnlocks:
+  - ClothingBackpackHarmpack
+
 # Tier 3
 
 - type: technology

Resources/Textures/Clothing/Back/Specific/harmpack.rsi/meta.json

@@ -0,0 +1,26 @@
+{
+    "version": 1,
+    "license": "CC0-1.0",
+    "copyright": "Created by EmoGarbage404 (github) for Space Station 14",
+    "size": {
+        "x": 32,
+        "y": 32
+    },
+    "states": [
+        {
+            "name": "icon"
+        },
+        {
+            "name": "equipped-BACKPACK",
+            "directions": 4
+        },
+        {
+            "name": "inhand-left",
+            "directions": 4
+        },
+        {
+            "name": "inhand-right",
+            "directions": 4
+        }
+    ]
+}