SpeechBubble occlusion (#8018)

Content.Client/Chat/ChatSystem.cs

@@ -0,0 +1,56 @@
+using Content.Client.Chat.Managers;
+using Content.Client.Chat.UI;
+using Content.Client.Examine;
+using Content.Shared.Chat;
+using Content.Shared.Examine;
+using Robust.Client.Player;
+using Robust.Shared.Map;
+
+namespace Content.Client.Chat;
+
+public sealed class ChatSystem : SharedChatSystem
+{
+    [Dependency] private readonly IChatManager _manager = default!;
+    [Dependency] private readonly IPlayerManager _player = default!;
+
+    public override void FrameUpdate(float frameTime)
+    {
+        base.FrameUpdate(frameTime);
+
+        var player = _player.LocalPlayer?.ControlledEntity;
+        var predicate = static (EntityUid uid, (EntityUid compOwner, EntityUid? attachedEntity) data)
+            => uid == data.compOwner || uid == data.attachedEntity;
+        var bubbles = _manager.GetSpeechBubbles();
+        var playerPos = player != null ? Transform(player.Value).MapPosition : MapCoordinates.Nullspace;
+
+        foreach (var (ent, bubs) in bubbles)
+        {
+            if (ent == player)
+            {
+                SetBubbles(bubs, true);
+                continue;
+            }
+
+            var otherPos = Transform(ent).MapPosition;
+
+            if (!ExamineSystemShared.InRangeUnOccluded(
+                    playerPos,
+                    otherPos, 0f,
+                    (ent, player), predicate))
+            {
+                SetBubbles(bubs, false);
+                continue;
+            }
+
+            SetBubbles(bubs, true);
+        }
+    }
+
+    private void SetBubbles(List<SpeechBubble> bubbles, bool value)
+    {
+        foreach (var bubble in bubbles)
+        {
+            bubble.Visible = value;
+        }
+    }
+}