make syndie bag and rigs explosion resistant (#22088)

* remove empty file real

* support explosion resistance for non-worn things

* remove redundant entitystorage resistance

* port entitystorage optimisation to apply for everything with 100% resistance

* add explosion resistance for bag contents

* make thing reusable

* add resistance to chest rig too

* medical chest rig too

---------

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/Explosion/Components/ExplosionResistanceComponent.cs

@@ -6,6 +6,8 @@ namespace Content.Server.Explosion.Components;
 
 /// <summary>
 /// Component that provides entities with explosion resistance.
+/// By default this is applied when worn, but to solely protect the entity itself and
+/// not the wearer use <c>worn: false</c>.
 /// </summary>
 /// <remarks>
 ///     This is desirable over just using damage modifier sets, given that equipment like bomb-suits need to
@@ -21,6 +23,20 @@ public sealed partial class ExplosionResistanceComponent : Component
     [DataField("damageCoefficient")]
     public float DamageCoefficient = 1;
 
+    /// <summary>
+    /// When true, resistances will be applied to the entity wearing this item.
+    /// When false, only this entity will get th resistance.
+    /// </summary>
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public bool Worn = true;
+
+    /// <summary>
+    /// Examine string for explosion resistance.
+    /// Passed <c>value</c> from 0 to 100.
+    /// </summary>
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public LocId Examine = "explosion-resistance-coefficient-value";
+
     /// <summary>
     ///     Modifiers specific to each explosion type for more customizability.
     /// </summary>

Content.Server/Explosion/EntitySystems/ExplosionSystem.Processing.cs

@@ -389,7 +389,13 @@ public sealed partial class ExplosionSystem
     private void GetEntitiesToDamage(EntityUid uid, DamageSpecifier originalDamage, string prototype)
     {
         _toDamage.Clear();
-        _toDamage.Add((uid, GetDamage(uid, prototype, originalDamage)));
+
+        // don't raise BeforeExplodeEvent if the entity is completely immune to explosions
+        var thisDamage = GetDamage(uid, prototype, originalDamage);
+        if (!thisDamage.Any())
+            return;
+
+        _toDamage.Add((uid, thisDamage));
 
         for (var i = 0; i < _toDamage.Count; i++)
         {

Content.Server/Explosion/EntitySystems/ExplosionSystem.cs

@@ -132,6 +132,7 @@ public sealed partial class ExplosionSystem : EntitySystem
     private void RelayedResistance(EntityUid uid, ExplosionResistanceComponent component,
         InventoryRelayedEvent<GetExplosionResistanceEvent> args)
     {
+        if (component.Worn)
             OnGetResistance(uid, component, ref args.Args);
     }
 
@@ -378,9 +379,9 @@ public sealed partial class ExplosionSystem : EntitySystem
 
     private void OnArmorExamine(EntityUid uid, ExplosionResistanceComponent component, ref ArmorExamineEvent args)
     {
+        var value = MathF.Round((1f - component.DamageCoefficient) * 100, 1);
+
         args.Msg.PushNewline();
-        args.Msg.AddMarkup(Loc.GetString("explosion-resistance-coefficient-value",
-            ("value", MathF.Round((1f - component.DamageCoefficient) * 100, 1))
-            ));
+        args.Msg.AddMarkup(Loc.GetString(component.Examine, ("value", value)));
     }
 }

Content.Server/Storage/EntitySystems/EntityStorageSystem.cs

@@ -102,11 +102,7 @@ public sealed class EntityStorageSystem : SharedEntityStorageSystem
 
     private void OnExploded(Entity<EntityStorageComponent> ent, ref BeforeExplodeEvent args)
     {
-        if (ent.Comp.ExplosionDamageCoefficient <= 0)
-            return;
-
         args.Contents.AddRange(ent.Comp.Contents.ContainedEntities);
-        args.DamageCoefficient *= ent.Comp.ExplosionDamageCoefficient;
     }
 
     protected override void TakeGas(EntityUid uid, SharedEntityStorageComponent component)

Content.Shared/Storage/Components/SharedEntityStorageComponent.cs

@@ -124,12 +124,6 @@ public abstract partial class SharedEntityStorageComponent : Component
     /// </summary>
     [ViewVariables]
     public Container Contents = default!;
-
-    /// <summary>
-    /// Multiplier for explosion damage that gets applied to contained entities.
-    /// </summary>
-    [DataField]
-    public float ExplosionDamageCoefficient = 1;
 }
 
 [Serializable, NetSerializable]

Resources/Locale/en-US/explosions/explosion-resistance.ftl

@@ -1 +1,2 @@
 explosion-resistance-coefficient-value = - [color=orange]Explosion[/color] damage reduced by [color=lightblue]{$value}%[/color].
+explosion-resistance-contents-coefficient-value = - [color=orange]Explosion[/color] damage [color=white]to contents[/color] reduced by [color=lightblue]{$value}%[/color].

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

@@ -1,5 +1,5 @@
 - type: entity
-  parent: Clothing
+  parent: [Clothing, ContentsExplosionResistanceBase]
   id: ClothingBackpack
   name: backpack
   description: You wear this on your back and put items into it.
@@ -28,6 +28,8 @@
   # to prevent bag open/honk spam
   - type: UseDelay
     delay: 0.5
+  - type: ExplosionResistance
+    damageCoefficient: 0.9
 
 - type: entity
   parent: ClothingBackpack

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

@@ -165,6 +165,8 @@
   components:
   - type: Sprite
     sprite: Clothing/Back/Duffels/syndicate.rsi
+  - type: ExplosionResistance
+    damageCoefficient: 0.1
 
 - type: entity
   parent: ClothingBackpackDuffelSyndicate

Resources/Prototypes/Entities/Clothing/Belt/belts.yml

@@ -511,7 +511,7 @@
     sprite: Clothing/Belt/salvagewebbing.rsi
 
 - type: entity
-  parent: ClothingBeltStorageBase
+  parent: [ClothingBeltStorageBase, ContentsExplosionResistanceBase]
   id: ClothingBeltMilitaryWebbing
   name: chest rig
   description: A set of tactical webbing worn by Syndicate boarding parties.
@@ -520,9 +520,11 @@
     sprite: Clothing/Belt/militarywebbing.rsi
   - type: Clothing
     sprite: Clothing/Belt/militarywebbing.rsi
+  - type: ExplosionResistance
+    damageCoefficient: 0.5
 
 - type: entity
-  parent: ClothingBeltStorageBase
+  parent: ClothingBeltMilitaryWebbing
   id: ClothingBeltMilitaryWebbingMed
   name: medical chest rig
   description: A set of tactical webbing worn by Gorlex Marauder medic operatives.

Resources/Prototypes/Entities/Clothing/base_clothing.yml

@@ -29,3 +29,16 @@
   - type: ContainerContainer
     containers:
       item: !type:ContainerSlot
+
+# a piece of clothing that has explosion resistance *for its contents*, not the wearer
+- type: entity
+  abstract: true
+  id: ContentsExplosionResistanceBase
+  components:
+  - type: ExplosionResistance
+    worn: true # only apply to the clothing itself and items inside, not the wearer
+    examine: explosion-resistance-contents-coefficient-value
+  # to show explosion resistance examine
+  - type: GroupExamine
+  - type: Armor
+    modifiers: {}