Make atmos Turing-complete (#10520)

* Add pneumatic valves

Pneumatic valves permit bidirectional flow between the inlet and outlet
if the pressure at the control port is high enough.

* Add construction recipe

Content.Server/Atmos/Piping/Trinary/Components/PressureControlledValveComponent.cs

@@ -0,0 +1,35 @@
+using Content.Shared.Atmos;
+
+namespace Content.Server.Atmos.Piping.Trinary.Components
+{
+    [RegisterComponent]
+    public sealed class PressureControlledValveComponent : Component
+    {
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("inlet")]
+        public string InletName { get; set; } = "inlet";
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("control")]
+        public string ControlName { get; set; } = "control";
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("outlet")]
+        public string OutletName { get; set; } = "outlet";
+
+        [ViewVariables(VVAccess.ReadOnly)]
+        [DataField("enabled")]
+        public bool Enabled { get; set; } = false;
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("gain")]
+        public float Gain { get; set; } = 10;
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("threshold")]
+        public float Threshold { get; set; } = Atmospherics.OneAtmosphere;
+
+        [DataField("maxTransferRate")]
+        public float MaxTransferRate { get; set; } = Atmospherics.MaxTransferRate;
+    }
+}

Content.Server/Atmos/Piping/Trinary/EntitySystems/PressureControlledValveSystem.cs

@@ -0,0 +1,96 @@
+using Content.Server.Atmos.EntitySystems;
+using Content.Server.Atmos.Piping.Components;
+using Content.Server.Atmos.Piping.Trinary.Components;
+using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
+using Content.Shared.Atmos.Piping;
+using Content.Shared.Audio;
+using JetBrains.Annotations;
+using Robust.Shared.Timing;
+
+namespace Content.Server.Atmos.Piping.Trinary.EntitySystems
+{
+    [UsedImplicitly]
+    public sealed class PressureControlledValveSystem : EntitySystem
+    {
+        [Dependency] private IGameTiming _gameTiming = default!;
+        [Dependency] private readonly AtmosphereSystem _atmosphereSystem = default!;
+        [Dependency] private readonly SharedAmbientSoundSystem _ambientSoundSystem = default!;
+
+        public override void Initialize()
+        {
+            base.Initialize();
+            SubscribeLocalEvent<PressureControlledValveComponent, ComponentInit>(OnInit);
+            SubscribeLocalEvent<PressureControlledValveComponent, AtmosDeviceUpdateEvent>(OnUpdate);
+            SubscribeLocalEvent<PressureControlledValveComponent, AtmosDeviceDisabledEvent>(OnFilterLeaveAtmosphere);
+        }
+
+        private void OnInit(EntityUid uid, PressureControlledValveComponent comp, ComponentInit args)
+        {
+            UpdateAppearance(uid, comp);
+        }
+
+        private void OnUpdate(EntityUid uid, PressureControlledValveComponent comp, AtmosDeviceUpdateEvent args)
+        {
+            if (!EntityManager.TryGetComponent(uid, out NodeContainerComponent? nodeContainer)
+                || !EntityManager.TryGetComponent(uid, out AtmosDeviceComponent? device)
+                || !nodeContainer.TryGetNode(comp.InletName, out PipeNode? inletNode)
+                || !nodeContainer.TryGetNode(comp.ControlName, out PipeNode? controlNode)
+                || !nodeContainer.TryGetNode(comp.OutletName, out PipeNode? outletNode))
+            {
+                _ambientSoundSystem.SetAmbience(comp.Owner, false);
+                comp.Enabled = false;
+                return;
+            }
+
+            // If output is higher than input, flip input/output to enable bidirectional flow.
+            if (outletNode.Air.Pressure > inletNode.Air.Pressure)
+            {
+                PipeNode temp = outletNode;
+                outletNode = inletNode;
+                inletNode = temp;
+            }
+
+            float control = (controlNode.Air.Pressure - outletNode.Air.Pressure) - comp.Threshold;
+            float transferRate;
+            if (control < 0)
+            {
+                comp.Enabled = false;
+                transferRate = 0;
+            }
+            else
+            {
+                comp.Enabled = true;
+                transferRate = Math.Min(control * comp.Gain, comp.MaxTransferRate);
+            }
+            UpdateAppearance(uid, comp);
+
+            // We multiply the transfer rate in L/s by the seconds passed since the last process to get the liters.
+            var transferRatio = (float)(transferRate * (_gameTiming.CurTime - device.LastProcess).TotalSeconds) / inletNode.Air.Volume;
+            if (transferRatio <= 0)
+            {
+                _ambientSoundSystem.SetAmbience(comp.Owner, false);
+                return;
+            }
+
+            _ambientSoundSystem.SetAmbience(comp.Owner, true);
+            var removed = inletNode.Air.RemoveRatio(transferRatio);
+            _atmosphereSystem.Merge(outletNode.Air, removed);
+        }
+
+        private void OnFilterLeaveAtmosphere(EntityUid uid, PressureControlledValveComponent comp, AtmosDeviceDisabledEvent args)
+        {
+            comp.Enabled = false;
+            UpdateAppearance(uid, comp);
+            _ambientSoundSystem.SetAmbience(comp.Owner, false);
+        }
+
+        private void UpdateAppearance(EntityUid uid, PressureControlledValveComponent? comp = null, AppearanceComponent? appearance = null)
+        {
+            if (!Resolve(uid, ref comp, ref appearance, false))
+                return;
+
+            appearance.SetData(FilterVisuals.Enabled, comp.Enabled);
+        }
+    }
+}

Resources/Prototypes/Entities/Structures/Piping/Atmospherics/trinary.yml

@@ -198,3 +198,58 @@
         !type:PipeNode
         nodeGroupID: Pipe
         pipeDirection: North
+
+- type: entity
+  parent: GasPipeBase
+  id: PressureControlledValve
+  name: pneumatic valve
+  description: Valve controlled by pressure.
+  placement:
+    mode: SnapgridCenter
+  components:
+    - type: AtmosDevice
+    - type: SubFloorHide
+      blockInteractions: false
+      blockAmbience: false
+    - type: NodeContainer
+      nodes:
+        inlet:
+          !type:PipeNode
+          nodeGroupID: Pipe
+          pipeDirection: North
+        control:
+          !type:PipeNode
+          nodeGroupID: Pipe
+          pipeDirection: West
+        outlet:
+          !type:PipeNode
+          nodeGroupID: Pipe
+          pipeDirection: South
+    - type: Sprite
+      netsync: false
+      sprite: Structures/Piping/Atmospherics/pneumaticvalve.rsi
+      layers:
+        - sprite: Structures/Piping/Atmospherics/pipe.rsi
+          state: pipeTJunction
+          rotation: -90
+          map: [ "enum.PipeVisualLayers.Pipe" ]
+        - state: off
+          map: [ "enum.SubfloorLayers.FirstLayer", "enabled" ]
+    - type: Appearance
+    - type: GenericVisualizer
+      visuals:
+        enum.FilterVisuals.Enabled:
+          enabled:
+            True: { state: on }
+            False: { state: off }
+    - type: PipeColorVisuals
+    - type: PressureControlledValve
+    - type: AmbientSound
+      enabled: false
+      volume: -9
+      range: 5
+      sound:
+        path: /Audio/Ambience/Objects/gas_hiss.ogg
+    - type: Construction
+      graph: GasTrinary
+      node: pneumaticvalve

Resources/Prototypes/Recipes/Construction/Graphs/utilities/atmos_trinary.yml

@@ -16,6 +16,12 @@
         amount: 2
         doAfter: 1
 
+    - to: pneumaticvalve
+      steps:
+      - material: Steel
+        amount: 2
+        doAfter: 1
+
   - node: filter
     entity: GasFilter
     edges:
@@ -47,3 +53,19 @@
       steps:
       - tool: Welding
         doAfter: 1
+
+  - node: pneumaticvalve
+    entity: PressureControlledValve
+    edges:
+    - to: start
+      conditions:
+      - !type:EntityAnchored
+        anchored: false
+      completed:
+      - !type:SpawnPrototype
+        prototype: SheetSteel1
+        amount: 2
+      - !type:DeleteEntity
+      steps:
+      - tool: Welding
+        doAfter: 1

Resources/Prototypes/Recipes/Construction/utilities.yml

@@ -12,7 +12,7 @@
     state: camera
   objectType: Structure
   placementMode: SnapgridCenter
-  
+
 - type: construction
   name: telescreen
   id: WallmountTelescreen
@@ -511,3 +511,17 @@
   conditions:
     - !type:TileNotBlocked {}
 
+- type: construction
+  id: PressureControlledValve
+  name: pneumatic valve
+  graph: GasTrinary
+  startNode: start
+  targetNode: pneumaticvalve
+  category: Utilities
+  placementMode: SnapgridCenter
+  canBuildInImpassable: false
+  icon:
+    sprite: Structures/Piping/Atmospherics/pneumaticvalve.rsi
+    state: off
+  conditions:
+    - !type:TileNotBlocked {}

Resources/Textures/Structures/Piping/Atmospherics/pneumaticvalve.rsi/meta.json

@@ -0,0 +1,19 @@
+{
+  "version": 1,
+  "license": "CC-BY-SA-4.0",
+  "copyright": "Kevin Zheng 2022",
+  "size": {
+    "x": 32,
+    "y": 32
+  },
+  "states": [
+    {
+      "name": "off",
+      "directions": 4
+    },
+    {
+      "name": "on",
+      "directions": 4
+    }
+  ]
+}