Adds barotrauma (pressure damage) (#1605)

* Adds barotrauma, disables it for now

* At least show status effect, but don't damage the mobs

* Fix switch misuse

Content.Server/GameObjects/Components/Atmos/BarotraumaComponent.cs

@@ -0,0 +1,98 @@
+using System.Runtime.CompilerServices;
+using CannyFastMath;
+using Content.Server.GameObjects.Components.Mobs;
+using Content.Server.GameObjects.EntitySystems;
+using Content.Server.Interfaces.GameObjects;
+using Content.Shared.Atmos;
+using Content.Shared.GameObjects.Components.Mobs;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Systems;
+
+namespace Content.Server.GameObjects.Components.Atmos
+{
+    /// <summary>
+    ///     Barotrauma: injury because of changes in air pressure.
+    /// </summary>
+    [RegisterComponent]
+    public class BarotraumaComponent : Component
+    {
+        public override string Name => "Barotrauma";
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public void Update(float frameTime)
+        {
+            if (!Owner.TryGetComponent(out DamageableComponent damageable)) return;
+            Owner.TryGetComponent(out ServerStatusEffectsComponent status);
+
+            var coordinates = Owner.Transform.GridPosition;
+            var gridAtmos = EntitySystem.Get<AtmosphereSystem>().GetGridAtmosphere(coordinates.GridID);
+            var tile = gridAtmos?.GetTile(coordinates);
+
+            var pressure = 1f;
+            var highPressureMultiplier = 1f;
+            var lowPressureMultiplier = 1f;
+
+            foreach (var protection in Owner.GetAllComponents<IPressureProtection>())
+            {
+                highPressureMultiplier *= protection.HighPressureMultiplier;
+                lowPressureMultiplier *= protection.LowPressureMultiplier;
+            }
+
+            if (tile?.Air != null)
+                pressure = MathF.Max(tile.Air.Pressure, 1f);
+
+            switch (pressure)
+            {
+                // Low pressure.
+                case var p when p <= Atmospherics.WarningLowPressure:
+                    pressure *= lowPressureMultiplier;
+
+                    if(pressure > Atmospherics.WarningLowPressure)
+                        goto default;
+
+                    // TODO ATMOS Uncomment this when saltern is pressurized
+                    //damageable.TakeDamage(DamageType.Brute, Atmospherics.LowPressureDamage, Owner, null);
+
+                    if (status == null) break;
+
+                    if (pressure <= Atmospherics.HazardLowPressure)
+                    {
+                        status.ChangeStatusEffect(StatusEffect.Pressure, "/Textures/Interface/StatusEffects/Pressure/lowpressure2.png", null);
+                        break;
+                    }
+
+                    status.ChangeStatusEffect(StatusEffect.Pressure, "/Textures/Interface/StatusEffects/Pressure/lowpressure1.png", null);
+                    break;
+
+                // High pressure.
+                case var p when p >= Atmospherics.WarningHighPressure:
+                    pressure *= highPressureMultiplier;
+
+                    if(pressure < Atmospherics.WarningHighPressure)
+                        goto default;
+
+                    var damage = (int) MathF.Min((pressure / Atmospherics.HazardHighPressure) * Atmospherics.PressureDamageCoefficient, Atmospherics.MaxHighPressureDamage);
+
+                    // TODO ATMOS Uncomment this when saltern is pressurized
+                    //damageable.TakeDamage(DamageType.Brute, damage, Owner, null);
+
+                    if (status == null) break;
+
+                    if (pressure >= Atmospherics.HazardHighPressure)
+                    {
+                        status.ChangeStatusEffect(StatusEffect.Pressure, "/Textures/Interface/StatusEffects/Pressure/highpressure2.png", null);
+                        break;
+                    }
+
+                    status.ChangeStatusEffect(StatusEffect.Pressure, "/Textures/Interface/StatusEffects/Pressure/highpressure1.png", null);
+                    break;
+
+                // Normal pressure.
+                default:
+                    status?.RemoveStatusEffect(StatusEffect.Pressure);
+                    break;
+            }
+
+        }
+    }
+}

Content.Server/GameObjects/Components/Atmos/PressureProtectionComponent.cs

@@ -0,0 +1,27 @@
+using Content.Server.Interfaces.GameObjects;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Server.GameObjects.Components.Atmos
+{
+    [RegisterComponent]
+    public class PressureProtectionComponent : Component, IPressureProtection
+    {
+        public override string Name => "PressureProtection";
+
+        [ViewVariables]
+        public float HighPressureMultiplier { get; private set; }
+
+        [ViewVariables]
+        public float LowPressureMultiplier { get; private set; }
+
+        public override void ExposeData(ObjectSerializer serializer)
+        {
+            base.ExposeData(serializer);
+
+            serializer.DataField(this, x => HighPressureMultiplier, "highPressureMultiplier", 1f);
+            serializer.DataField(this, x => LowPressureMultiplier, "lowPressureMultiplier", 1f);
+        }
+    }
+}

Content.Server/GameObjects/Components/GUI/InventoryComponent.cs

@@ -8,6 +8,7 @@ using Content.Server.GameObjects.Components.Items.Storage;
 using Content.Server.GameObjects.EntitySystems.Click;
 using Content.Server.Interfaces.GameObjects.Components.Interaction;
 using Content.Server.Interfaces;
+using Content.Server.Interfaces.GameObjects;
 using Content.Shared.GameObjects;
 using Content.Shared.GameObjects.EntitySystems;
 using Robust.Server.GameObjects.Components.Container;
@@ -26,7 +27,7 @@ using static Content.Shared.GameObjects.SharedInventoryComponent.ClientInventory
 namespace Content.Server.GameObjects
 {
     [RegisterComponent]
-    public class InventoryComponent : SharedInventoryComponent, IExAct, IEffectBlocker
+    public class InventoryComponent : SharedInventoryComponent, IExAct, IEffectBlocker, IPressureProtection
     {
 #pragma warning disable 649
         [Dependency] private readonly IEntitySystemManager _entitySystemManager;
@@ -51,6 +52,52 @@ namespace Content.Server.GameObjects
             }
         }
 
+        // Optimization: Cache this
+        [ViewVariables]
+        public float HighPressureMultiplier
+        {
+            get
+            {
+                var multiplier = 1f;
+
+                foreach (var (slot, containerSlot) in SlotContainers)
+                {
+                    foreach (var entity in containerSlot.ContainedEntities)
+                    {
+                        foreach (var protection in entity.GetAllComponents<IPressureProtection>())
+                        {
+                            multiplier *= protection.HighPressureMultiplier;
+                        }
+                    }
+                }
+
+                return multiplier;
+            }
+        }
+
+        // Optimization: Cache this
+        [ViewVariables]
+        public float LowPressureMultiplier
+        {
+            get
+            {
+                var multiplier = 1f;
+
+                foreach (var (slot, containerSlot) in SlotContainers)
+                {
+                    foreach (var entity in containerSlot.ContainedEntities)
+                    {
+                        foreach (var protection in entity.GetAllComponents<IPressureProtection>())
+                        {
+                            multiplier *= protection.LowPressureMultiplier;
+                        }
+                    }
+                }
+
+                return multiplier;
+            }
+        }
+
         bool IEffectBlocker.CanSlip()
         {
             if(Owner.TryGetComponent(out InventoryComponent inventoryComponent) &&

Content.Server/GameObjects/EntitySystems/BarotraumaSystem.cs

@@ -0,0 +1,29 @@
+using Content.Server.GameObjects.Components.Atmos;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects.Systems;
+
+namespace Content.Server.GameObjects.EntitySystems
+{
+    [UsedImplicitly]
+    public class BarotraumaSystem : EntitySystem
+    {
+        private const float TimePerUpdate = 0.5f;
+
+        private float _timer = 0f;
+
+        /// <inheritdoc />
+        public override void Update(float frameTime)
+        {
+            _timer += frameTime;
+
+            if (_timer < TimePerUpdate) return;
+
+            _timer = 0f;
+
+            foreach (var barotraumaComp in ComponentManager.EntityQuery<BarotraumaComponent>())
+            {
+                barotraumaComp.Update(frameTime);
+            }
+        }
+    }
+}