Add noir glasses (#36923)

hardboiled

Content.Client/Overlays/BlackAndWhiteOverlay.cs

@@ -0,0 +1,47 @@
+using Robust.Client.Graphics;
+using Robust.Client.Player;
+using Robust.Shared.Enums;
+using Robust.Shared.Prototypes;
+
+namespace Content.Client.Overlays;
+
+public sealed partial class BlackAndWhiteOverlay : Overlay
+{
+    [Dependency] private readonly IEntityManager _entityManager = default!;
+    [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
+    [Dependency] private readonly IPlayerManager _playerManager = default!;
+
+    public override OverlaySpace Space => OverlaySpace.WorldSpace;
+    public override bool RequestScreenTexture => true;
+    private readonly ShaderInstance _greyscaleShader;
+
+    public BlackAndWhiteOverlay()
+    {
+        IoCManager.InjectDependencies(this);
+        _greyscaleShader = _prototypeManager.Index<ShaderPrototype>("GreyscaleFullscreen").InstanceUnique();
+        ZIndex = 10; // draw this over the DamageOverlay, RainbowOverlay etc.
+    }
+
+    protected override bool BeforeDraw(in OverlayDrawArgs args)
+    {
+        if (!_entityManager.TryGetComponent(_playerManager.LocalEntity, out EyeComponent? eyeComp))
+            return false;
+
+        if (args.Viewport.Eye != eyeComp.Eye)
+            return false;
+
+        return true;
+    }
+
+    protected override void Draw(in OverlayDrawArgs args)
+    {
+        if (ScreenTexture == null)
+            return;
+
+        var handle = args.WorldHandle;
+        _greyscaleShader.SetParameter("SCREEN_TEXTURE", ScreenTexture);
+        handle.UseShader(_greyscaleShader);
+        handle.DrawRect(args.WorldBounds, Color.White);
+        handle.UseShader(null);
+    }
+}

Content.Client/Overlays/BlackAndWhiteOverlaySystem.cs

@@ -0,0 +1,34 @@
+using Content.Shared.Inventory.Events;
+using Content.Shared.Overlays;
+using Robust.Client.Graphics;
+using Robust.Client.Player;
+
+namespace Content.Client.Overlays;
+
+public sealed partial class BlackAndWhiteOverlaySystem : EquipmentHudSystem<BlackAndWhiteOverlayComponent>
+{
+    [Dependency] private readonly IOverlayManager _overlayMan = default!;
+
+    private BlackAndWhiteOverlay _overlay = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        _overlay = new();
+    }
+
+    protected override void UpdateInternal(RefreshEquipmentHudEvent<BlackAndWhiteOverlayComponent> component)
+    {
+        base.UpdateInternal(component);
+
+        _overlayMan.AddOverlay(_overlay);
+    }
+
+    protected override void DeactivateInternal()
+    {
+        base.DeactivateInternal();
+
+        _overlayMan.RemoveOverlay(_overlay);
+    }
+}