Cached barotrauma resistance and immunity values instead of computing them each Update() (#15055)

Content.Server/Atmos/Components/BarotraumaComponent.cs

@@ -26,6 +26,25 @@ namespace Content.Server.Atmos.Components
         ///     These are the inventory slots that are checked for pressure protection. If a slot is missing protection, no protection is applied.
         /// </summary>
         [DataField("protectionSlots")]
-        public List<string> ProtectionSlots = new() { "head", "outerClothing" }; 
+        public List<string> ProtectionSlots = new() { "head", "outerClothing" };
+
+        /// <summary>
+        /// Cached pressure protection values
+        /// </summary>
+        [ViewVariables]
+        public float HighPressureMultiplier = 1f;
+        [ViewVariables]
+        public float HighPressureModifier = 0f;
+        [ViewVariables]
+        public float LowPressureMultiplier = 1f;
+        [ViewVariables]
+        public float LowPressureModifier = 0f;
+
+        /// <summary>
+        /// Whether the entity is immuned to pressure (i.e possess the PressureImmunity component)
+        /// </summary>
+        [ViewVariables]
+        public bool HasImmunity = false;
+
     }
 }