Add Sprite changes to Logic Gates to show the input/output state

Content.Server/DeviceLinking/Components/LogicGateComponent.cs

@@ -18,6 +18,15 @@ public sealed partial class LogicGateComponent : Component
     [DataField]
     public LogicGate Gate = LogicGate.Or;
 
+    [DataField]
+    public LogicGateState InputA = LogicGateState.Low;
+
+    [DataField]
+    public LogicGateState InputB = LogicGateState.Low;
+
+    [DataField]
+    public LogicGateState Output = LogicGateState.Low;
+
     /// <summary>
     /// Tool quality to use for cycling logic gate operations.
     /// Cannot be pulsing since linking uses that.

Content.Server/DeviceLinking/Systems/LogicGateSystem.cs

@@ -102,10 +102,12 @@ private void OnSignalReceived(EntityUid uid, LogicGateComponent comp, ref Signal
         if (args.Port == comp.InputPortA)
         {
             comp.StateA = state;
+            _appearance.SetData(uid, LogicGateVisuals.InputA, SignalToLogicState(state));
         }
         else if (args.Port == comp.InputPortB)
         {
             comp.StateB = state;
+            _appearance.SetData(uid, LogicGateVisuals.InputB, SignalToLogicState(state));
         }
 
         UpdateOutput(uid, comp);
@@ -143,6 +145,8 @@ private void UpdateOutput(EntityUid uid, LogicGateComponent comp)
                 break;
         }
 
+        _appearance.SetData(uid, LogicGateVisuals.Output, output ? LogicGateState.High : LogicGateState.Low);
+
         // only send a payload if it actually changed
         if (output != comp.LastOutput)
         {
@@ -151,4 +155,14 @@ private void UpdateOutput(EntityUid uid, LogicGateComponent comp)
             _deviceLink.SendSignal(uid, comp.OutputPort, output);
         }
     }
+
+    private static LogicGateState SignalToLogicState(SignalState state)
+    {
+        return state switch
+        {
+            SignalState.High => LogicGateState.High,
+            SignalState.Low => LogicGateState.Low,
+            _ => LogicGateState.Momentary,
+        };
+    }
 }

Content.Shared/DeviceLinking/SharedLogicGate.cs

@@ -23,7 +23,10 @@ public enum LogicGate : byte
 [Serializable, NetSerializable]
 public enum LogicGateVisuals : byte
 {
-    Gate
+    Gate,
+    InputA,
+    InputB,
+    Output
 }
 
 /// <summary>
@@ -32,5 +35,16 @@ public enum LogicGateVisuals : byte
 [Serializable, NetSerializable]
 public enum LogicGateLayers : byte
 {
-    Gate
+    Gate,
+    InputA,
+    InputB,
+    Output
+}
+
+[Serializable, NetSerializable]
+public enum LogicGateState : byte
+{
+    Low,
+    High,
+    Momentary
 }

Resources/Prototypes/Entities/Structures/gates.yml

@@ -36,6 +36,12 @@
     layers:
     - state: base
     - state: logic
+    - state: empty
+      map: [ "enum.LogicGateLayers.InputA" ]
+    - state: empty
+      map: [ "enum.LogicGateLayers.InputB" ]
+    - state: empty
+      map: [ "enum.LogicGateLayers.Output" ]
     - state: or
       map: [ "enum.LogicGateLayers.Gate" ]
   - type: LogicGate
@@ -63,6 +69,18 @@
           Nor: { state: nor }
           Nand: { state: nand }
           Xnor: { state: xnor }
+      enum.LogicGateVisuals.InputA:
+        enum.LogicGateLayers.InputA:
+          High: { state: logic_a }
+          Low:  { state: empty }
+      enum.LogicGateVisuals.InputB:
+        enum.LogicGateLayers.InputB:
+          High: { state: logic_b }
+          Low:  { state: empty }
+      enum.LogicGateVisuals.Output:
+        enum.LogicGateLayers.Output:
+          High: { state: logic_o }
+          Low:  { state: empty }
 
 - type: entity
   parent: LogicGateOr

Resources/Textures/Objects/Devices/gates.rsi/meta.json

@@ -13,6 +13,18 @@
     {
       "name": "logic"
     },
+    {
+       "name":  "logic_o"
+    },
+    {
+       "name":  "logic_b"
+    },
+    {
+      "name":  "logic_a"
+    },
+    {
+      "name":  "empty"
+    },
     {
       "name": "or"
     },