Add haloperidol, potassium iodide (#27454)

* add haloperidol, potassium iodide

* review fixes

* review and tuning

* shader review

* use timespan and AutoPausedField

Content.Client/Drowsiness/DrowsinessOverlay.cs

@@ -0,0 +1,80 @@
+using Content.Shared.Drowsiness;
+using Content.Shared.StatusEffect;
+using Robust.Client.Graphics;
+using Robust.Client.Player;
+using Robust.Shared.Enums;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Timing;
+
+namespace Content.Client.Drowsiness;
+
+public sealed class DrowsinessOverlay : Overlay
+{
+    [Dependency] private readonly IEntityManager _entityManager = default!;
+    [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
+    [Dependency] private readonly IPlayerManager _playerManager = default!;
+    [Dependency] private readonly IEntitySystemManager _sysMan = default!;
+    [Dependency] private readonly IGameTiming _timing = default!;
+
+    public override OverlaySpace Space => OverlaySpace.WorldSpace;
+    public override bool RequestScreenTexture => true;
+    private readonly ShaderInstance _drowsinessShader;
+
+    public float CurrentPower = 0.0f;
+
+    private const float PowerDivisor = 250.0f;
+    private const float Intensity = 0.2f; // for adjusting the visual scale
+    private float _visualScale = 0; // between 0 and 1
+
+    public DrowsinessOverlay()
+    {
+        IoCManager.InjectDependencies(this);
+        _drowsinessShader = _prototypeManager.Index<ShaderPrototype>("Drowsiness").InstanceUnique();
+    }
+
+    protected override void FrameUpdate(FrameEventArgs args)
+    {
+        var playerEntity = _playerManager.LocalEntity;
+
+        if (playerEntity == null)
+            return;
+
+        if (!_entityManager.HasComponent<DrowsinessComponent>(playerEntity)
+            || !_entityManager.TryGetComponent<StatusEffectsComponent>(playerEntity, out var status))
+            return;
+
+        var statusSys = _sysMan.GetEntitySystem<StatusEffectsSystem>();
+        if (!statusSys.TryGetTime(playerEntity.Value, SharedDrowsinessSystem.DrowsinessKey, out var time, status))
+            return;
+
+        var curTime = _timing.CurTime;
+        var timeLeft = (float)(time.Value.Item2 - curTime).TotalSeconds;
+
+        CurrentPower += 8f * (0.5f * timeLeft - CurrentPower) * args.DeltaSeconds / (timeLeft + 1);
+    }
+
+    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;
+
+        _visualScale = Math.Clamp(CurrentPower / PowerDivisor, 0.0f, 1.0f);
+        return _visualScale > 0;
+    }
+
+    protected override void Draw(in OverlayDrawArgs args)
+    {
+        if (ScreenTexture == null)
+            return;
+
+        var handle = args.WorldHandle;
+        _drowsinessShader.SetParameter("SCREEN_TEXTURE", ScreenTexture);
+        _drowsinessShader.SetParameter("Strength", _visualScale * Intensity);
+        handle.UseShader(_drowsinessShader);
+        handle.DrawRect(args.WorldBounds, Color.White);
+        handle.UseShader(null);
+    }
+}