Add emp grenade (#14393)

Content.Server/Emp/EmpOnTriggerComponent.cs

@@ -0,0 +1,17 @@
+namespace Content.Server.Emp;
+
+/// <summary>
+/// Upon being triggered will EMP area around it.
+/// </summary>
+[RegisterComponent]
+sealed class EmpOnTriggerComponent : Component
+{
+    [DataField("range"), ViewVariables(VVAccess.ReadWrite)]
+    public float Range = 1.0f;
+
+    /// <summary>
+    /// How much energy will be consumed per battery in range
+    /// </summary>
+    [DataField("energyConsumption"), ViewVariables(VVAccess.ReadWrite)]
+    public float EnergyConsumption;
+}

Content.Server/Emp/EmpSystem.cs

@@ -0,0 +1,39 @@
+using Content.Server.Explosion.EntitySystems;
+using Robust.Shared.Map;
+
+namespace Content.Server.Emp;
+
+public sealed class EmpSystem : EntitySystem
+{
+    [Dependency] private readonly EntityLookupSystem _lookup = default!;
+
+    public const string EmpPulseEffectPrototype = "EffectEmpPulse";
+    public const string EmpDisabledEffectPrototype = "EffectEmpDisabled";
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<EmpOnTriggerComponent, TriggerEvent>(HandleEmpTrigger);
+    }
+
+    public void EmpPulse(MapCoordinates coordinates, float range, float energyConsumption)
+    {
+        foreach (var uid in _lookup.GetEntitiesInRange(coordinates, range))
+        {
+            var ev = new EmpPulseEvent(energyConsumption, false);
+            RaiseLocalEvent(uid, ref ev);
+            if (ev.Affected)
+                Spawn(EmpDisabledEffectPrototype, Transform(uid).Coordinates);
+        }
+        Spawn(EmpPulseEffectPrototype, coordinates);
+    }
+
+    private void HandleEmpTrigger(EntityUid uid, EmpOnTriggerComponent comp, TriggerEvent args)
+    {
+        EmpPulse(Transform(uid).Coordinates.ToMap(EntityManager), comp.Range, comp.EnergyConsumption);
+        args.Handled = true;
+    }
+}
+
+[ByRefEvent]
+public record struct EmpPulseEvent(float EnergyConsumption, bool Affected);

Content.Server/Light/EntitySystems/PoweredLightSystem.cs

@@ -22,6 +22,7 @@ using Robust.Shared.Containers;
 using Robust.Shared.Player;
 using Robust.Shared.Timing;
 using Content.Shared.DoAfter;
+using Content.Server.Emp;
 
 namespace Content.Server.Light.EntitySystems
 {
@@ -63,6 +64,8 @@ namespace Content.Server.Light.EntitySystems
             SubscribeLocalEvent<PoweredLightComponent, PowerChangedEvent>(OnPowerChanged);
 
             SubscribeLocalEvent<PoweredLightComponent, DoAfterEvent>(OnDoAfter);
+
+            SubscribeLocalEvent<PoweredLightComponent, EmpPulseEvent>(OnEmpPulse);
         }
 
         private void OnInit(EntityUid uid, PoweredLightComponent light, ComponentInit args)
@@ -421,5 +424,11 @@ namespace Content.Server.Light.EntitySystems
 
             args.Handled = true;
         }
+
+        private void OnEmpPulse(EntityUid uid, PoweredLightComponent component, ref EmpPulseEvent args)
+        {
+            args.Affected = true;
+            TryDestroyBulb(uid, component);  
+        }
     }
 }

Content.Server/Power/EntitySystems/ApcSystem.cs

@@ -1,3 +1,4 @@
+using Content.Server.Emp;
 using Content.Server.Popups;
 using Content.Server.Power.Components;
 using Content.Shared.Access.Components;
@@ -44,6 +45,8 @@ namespace Content.Server.Power.EntitySystems
             SubscribeLocalEvent<ApcToolFinishedEvent>(OnToolFinished);
             SubscribeLocalEvent<ApcComponent, InteractUsingEvent>(OnInteractUsing);
             SubscribeLocalEvent<ApcComponent, ExaminedEvent>(OnExamine);
+
+            SubscribeLocalEvent<ApcComponent, EmpPulseEvent>(OnEmpPulse);
         }
 
         // Change the APC's state only when the battery state changes, or when it's first created.
@@ -247,5 +250,14 @@ namespace Content.Server.Power.EntitySystems
                 ? "apc-component-on-examine-panel-open"
                 : "apc-component-on-examine-panel-closed"));
         }
+
+        private void OnEmpPulse(EntityUid uid, ApcComponent component, ref EmpPulseEvent args)
+        {
+            if (component.MainBreakerEnabled)
+            {
+                args.Affected = true;
+                ApcToggleBreaker(uid, component);
+            }
+        }
     }
 }

Content.Server/Power/EntitySystems/BatterySystem.cs

@@ -1,4 +1,5 @@
 using Content.Server.Cargo.Systems;
+using Content.Server.Emp;
 using Content.Server.Power.Components;
 using Content.Shared.Examine;
 using Content.Shared.Rejuvenate;
@@ -17,6 +18,7 @@ namespace Content.Server.Power.EntitySystems
             SubscribeLocalEvent<PowerNetworkBatteryComponent, RejuvenateEvent>(OnNetBatteryRejuvenate);
             SubscribeLocalEvent<BatteryComponent, RejuvenateEvent>(OnBatteryRejuvenate);
             SubscribeLocalEvent<BatteryComponent, PriceCalculationEvent>(CalculateBatteryPrice);
+            SubscribeLocalEvent<BatteryComponent, EmpPulseEvent>(OnEmpPulse);
 
             SubscribeLocalEvent<NetworkBatteryPreSync>(PreSync);
             SubscribeLocalEvent<NetworkBatteryPostSync>(PostSync);
@@ -87,5 +89,11 @@ namespace Content.Server.Power.EntitySystems
         {
             args.Price += component.CurrentCharge * component.PricePerJoule;
         }
+
+        private void OnEmpPulse(EntityUid uid, BatteryComponent component, ref EmpPulseEvent args)
+        {
+            args.Affected = true;
+            component.UseCharge(args.EnergyConsumption);   
+        }
     }
 }

Resources/Locale/en-US/store/uplink-catalog.ftl

@@ -39,6 +39,9 @@ uplink-c4-desc = Use it to breach walls, airlocks or sabotage equipment. It can
 uplink-c4-bundle-name = C-4 bundle
 uplink-c4-bundle-desc = Because sometimes quantity is quality. Contains 8 C-4 plastic explosives.
 
+uplink-emp-grenade-name = Emp Grenade
+uplink-emp-grenade-desc = Releases electromagnetic pulses that disrupt or damage many electronic devices or drain power cells.
+
 # Ammo
 uplink-pistol-magazine-name = Pistol Magazine (.35 auto)
 uplink-pistol-magazine-desc = Pistol magazine with 10 catridges. Compatible with Viper.

Resources/Prototypes/Catalog/uplink_catalog.yml

@@ -142,6 +142,16 @@
   categories:
   - UplinkExplosives
 
+- type: listing
+  id: UplinkEmpGrenade
+  name: uplink-emp-grenade-name
+  description: uplink-emp-grenade-desc
+  productEntity: EmpGrenade
+  cost:
+    Telecrystal: 4
+  categories:
+  - UplinkExplosives
+
 # Ammo
 
 - type: listing

Resources/Prototypes/Entities/Effects/emp_effects.yml

@@ -0,0 +1,44 @@
+- type: entity
+  id: EffectEmpPulse
+  noSpawn: true
+  components:
+  - type: TimedDespawn
+    lifetime: 0.8
+  - type: Sprite
+    netsync: false
+    drawdepth: Effects
+    noRot: true
+    layers:
+      - shader: unshaded
+        map: ["enum.EffectLayers.Unshaded"]
+        sprite: Effects/emp.rsi
+        state: emp_pulse
+  - type: EffectVisuals
+  - type: Tag
+    tags:
+      - HideContextMenu
+  - type: EmitSoundOnSpawn
+    sound: 
+      path: /Audio/Effects/Lightning/lightningbolt.ogg
+  - type: AnimationPlayer
+
+- type: entity
+  id: EffectEmpDisabled
+  noSpawn: true
+  components:
+  - type: TimedDespawn
+    lifetime: 0.4
+  - type: Sprite
+    netsync: false
+    drawdepth: Effects
+    noRot: true
+    layers:
+      - shader: unshaded
+        map: ["enum.EffectLayers.Unshaded"]
+        sprite: Effects/emp.rsi
+        state: emp_disable
+  - type: EffectVisuals
+  - type: Tag
+    tags:
+      - HideContextMenu
+  - type: AnimationPlayer

Resources/Prototypes/Entities/Objects/Weapons/Throwable/grenades.yml

@@ -154,3 +154,21 @@
         enum.Trigger.TriggerVisualState.Unprimed: complete
   - type: StaticPrice
     price: 25
+
+- type: entity
+  name: emp grenade
+  description: Releases electromagnetic pulses that disrupt or damage many electronic devices or drain power cells.
+  parent: GrenadeBase
+  id: EmpGrenade
+  components:
+  - type: Sprite
+    sprite: Objects/Weapons/Grenades/empgrenade.rsi
+  - type: EmpOnTrigger
+    range: 4
+    energyConsumption: 50000
+  - type: DeleteOnTrigger
+  - type: Appearance
+    visuals:
+    - type: TimerTriggerVisualizer
+      countdown_sound:
+        path: /Audio/Effects/countdown.ogg

Resources/Textures/Effects/emp.rsi/meta.json

@@ -0,0 +1,56 @@
+{
+  "version": 1,
+  "license": "CC-BY-SA-3.0",
+  "copyright": "Taken from tgstation at https://github.com/tgstation/tgstation/commit/e52683d3872347af447bb0ff74c420d4a4e91ea8",
+  "size": {
+    "x": 32,
+    "y": 32
+  },
+  "states": [
+    {
+      "name": "emp_disable",
+      "directions": 4,
+      "delays": [
+        [
+          0.1,
+          0.1,
+          0.1,
+          0.1
+        ],
+        [
+          0.1,
+          0.1,
+          0.1,
+          0.1
+        ],
+        [
+          0.1,
+          0.1,
+          0.1,
+          0.1
+        ],
+        [
+          0.1,
+          0.1,
+          0.1,
+          0.1
+        ]
+      ]
+    },
+    {
+      "name": "emp_pulse",
+      "delays": [
+        [
+          0.1,
+          0.1,
+          0.1,
+          0.1,
+          0.1,
+          0.1,
+          0.1,
+          0.1
+        ]
+      ]
+    }
+  ]
+}

Resources/Textures/Objects/Weapons/Grenades/empgrenade.rsi/meta.json

@@ -0,0 +1,27 @@
+{
+  "version": 1,
+  "license": "CC-BY-SA-3.0",
+  "copyright": "Taken from tgstation at https://github.com/tgstation/tgstation/commit/e52683d3872347af447bb0ff74c420d4a4e91ea8",
+  "size": {
+    "x": 32,
+    "y": 32
+  },
+  "states": [
+    {
+      "name": "icon"
+    },
+    {
+      "name": "primed",
+      "delays": [
+        [
+          0.1,
+          0.1
+        ]
+      ]
+    },
+    {
+      "name": "equipped-BELT",
+      "directions": 4
+    }
+  ]
+}