[2 lines] fix blinding (#9690)

* Adds blinding + blindfolds (#8688)

* Adds blinding + blindfolds

* Don't break examining lol

* moment

* fix toggle lights behavior

* move checks around

* Sloth review

* Added a salvage funny

* review

* woops

* Switch circle shader

Co-authored-by: wrexbe <wrexbe@protonmail.com>

* resolve merge conflict

Co-authored-by: wrexbe <wrexbe@protonmail.com>

Content.Shared/Eye/Blinding/BlindableComponent.cs

@@ -0,0 +1,26 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Eye.Blinding
+{
+    [RegisterComponent]
+    [NetworkedComponent]
+    public sealed class BlindableComponent : Component
+    {
+        /// <description>
+        /// How many sources of blindness are affecting us?
+        /// </description>
+        [DataField("sources")]
+        public int Sources = 0;
+
+        /// <description>
+        /// Used to ensure that this doesn't break with sandbox or admin tools.
+        /// This is not "enabled/disabled".
+        /// </description>
+        public bool LightSetup = false;
+
+        /// <description>
+        /// Gives an extra frame of blindness to reenable light manager during
+        /// </description>
+        public bool GraceFrame = false;
+    }
+}

Content.Shared/Eye/Blinding/BlindfoldComponent.cs

@@ -0,0 +1,12 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Eye.Blinding
+{
+    [RegisterComponent]
+    [NetworkedComponent]
+    public sealed class BlindfoldComponent : Component
+    {
+        [ViewVariables]
+        public bool IsActive = false;
+    }
+}

Content.Shared/Eye/Blinding/SharedBlindingSystem.cs

@@ -0,0 +1,40 @@
+using Content.Shared.Inventory.Events;
+using Content.Shared.Inventory;
+using Content.Shared.Item;
+
+namespace Content.Shared.Eye.Blinding
+{
+    public sealed class SharedBlindingSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+            SubscribeLocalEvent<BlindfoldComponent, GotEquippedEvent>(OnEquipped);
+            SubscribeLocalEvent<BlindfoldComponent, GotUnequippedEvent>(OnUnequipped);
+        }
+
+        private void OnEquipped(EntityUid uid, BlindfoldComponent component, GotEquippedEvent args)
+        {
+            if (!TryComp<SharedItemComponent>(uid, out var clothing) || clothing.SlotFlags == SlotFlags.PREVENTEQUIP) // we live in a society
+                return;
+            // Is the clothing in its actual slot?
+            if (!clothing.SlotFlags.HasFlag(args.SlotFlags))
+                return;
+
+            component.IsActive = true;
+            if (!TryComp<BlindableComponent>(args.Equipee, out var blindComp))
+                return;
+            blindComp.Sources++;
+        }
+
+        private void OnUnequipped(EntityUid uid, BlindfoldComponent component, GotUnequippedEvent args)
+        {
+            if (!component.IsActive)
+                return;
+            component.IsActive = false;
+            if (!TryComp<BlindableComponent>(args.Equipee, out var blindComp))
+                return;
+            blindComp.Sources--;
+        }
+    }
+}