Resolves ApcVisualizer is Obsolete (#13898)

Content.Client/Power/APC/ApcVisualizerSystem.cs

@@ -0,0 +1,106 @@
+using Content.Shared.APC;
+using JetBrains.Annotations;
+using Robust.Client.GameObjects;
+
+namespace Content.Client.Power.APC;
+
+public sealed class ApcVisualizerSystem : VisualizerSystem<ApcVisualsComponent>
+{
+    protected override void OnAppearanceChange(EntityUid uid, ApcVisualsComponent comp, ref AppearanceChangeEvent args)
+    {
+        if (args.Sprite == null)
+            return;
+
+        // Handle APC screen overlay:
+        if(!AppearanceSystem.TryGetData<ApcChargeState>(uid, ApcVisuals.ChargeState, out var chargeState, args.Component))
+            chargeState = ApcChargeState.Lack;
+
+        if (chargeState >= 0 && chargeState < ApcChargeState.NumStates)
+        {
+            args.Sprite.LayerSetState(ApcVisualLayers.ChargeState, $"{comp.ScreenPrefix}-{comp.ScreenSuffixes[(sbyte)chargeState]}");
+
+            // LockState does nothing currently. The backend doesn't exist.
+            if (AppearanceSystem.TryGetData<byte>(uid, ApcVisuals.LockState, out var lockStates, args.Component))
+            {
+                for(var i = 0; i < comp.LockIndicators; ++i)
+                {
+                    var layer = ((byte)ApcVisualLayers.LockIndicatorOverlayStart + i);
+                    sbyte lockState = (sbyte)((lockStates >> (i << (sbyte)ApcLockState.LogWidth)) & (sbyte)ApcLockState.All);
+                    args.Sprite.LayerSetState(layer, $"{comp.LockPrefix}{i}-{comp.LockSuffixes[lockState]}");
+                    args.Sprite.LayerSetVisible(layer, true);
+                }
+            }
+
+            // ChannelState does nothing currently. The backend doesn't exist.
+            if (AppearanceSystem.TryGetData<byte>(uid, ApcVisuals.ChannelState, out var channelStates, args.Component))
+            {
+                for(var i = 0; i < comp.ChannelIndicators; ++i)
+                {
+                    var layer = ((byte)ApcVisualLayers.ChannelIndicatorOverlayStart + i);
+                    sbyte channelState = (sbyte)((channelStates >> (i << (sbyte)ApcChannelState.LogWidth)) & (sbyte)ApcChannelState.All);
+                    args.Sprite.LayerSetState(layer, $"{comp.ChannelPrefix}{i}-{comp.ChannelSuffixes[channelState]}");
+                    args.Sprite.LayerSetVisible(layer, true);
+                }
+            }
+
+            if (TryComp<SharedPointLightComponent>(uid, out var light))
+                light.Color = comp.ScreenColors[(sbyte)chargeState];
+        }
+        else
+        {
+            /// Overrides all of the lock and channel indicators.
+            args.Sprite.LayerSetState(ApcVisualLayers.ChargeState, comp.EmaggedScreenState);
+            for(var i = 0; i < comp.LockIndicators; ++i)
+            {
+                var layer = ((byte)ApcVisualLayers.LockIndicatorOverlayStart + i);
+                args.Sprite.LayerSetVisible(layer, false);
+            }
+            for(var i = 0; i < comp.ChannelIndicators; ++i)
+            {
+                var layer = ((byte)ApcVisualLayers.ChannelIndicatorOverlayStart + i);
+                args.Sprite.LayerSetVisible(layer, false);
+            }
+
+            if (TryComp<SharedPointLightComponent>(uid, out var light))
+                light.Color = comp.EmaggedScreenColor;
+        }
+    }
+}
+
+enum ApcVisualLayers : byte
+{
+    /// <summary>
+    /// The sprite layer used for the interface lock indicator light overlay.
+    /// </summary>
+    InterfaceLock = 0,
+    /// <summary>
+    /// The sprite layer used for the panel lock indicator light overlay.
+    /// </summary>
+    PanelLock = 1,
+    /// <summary>
+    /// The first of the lock indicator light layers.
+    /// </summary>
+    LockIndicatorOverlayStart = InterfaceLock,
+
+    /// <summary>
+    /// The sprite layer used for the equipment channel indicator light overlay.
+    /// </summary>
+    Equipment = 2,
+    /// <summary>
+    /// The sprite layer used for the lighting channel indicator light overlay.
+    /// </summary>
+    Lighting = 3,
+    /// <summary>
+    /// The sprite layer used for the environment channel indicator light overlay.
+    /// </summary>
+    Environment = 4,
+    /// <summary>
+    /// The first of the channel status indicator light layers.
+    /// </summary>
+    ChannelIndicatorOverlayStart = Equipment,
+
+    /// <summary>
+    /// The sprite layer used for the APC screen overlay.
+    /// </summary>
+    ChargeState = 5,
+}