VGRoid support (#27659)

* Dungeon spawn support for grid spawns

* Recursive dungeons working

* Mask approach working

* zack

* More work

* Fix recursive dungeons

* Heap of work

* weh

* the cud

* rar

* Job

* weh

* weh

* weh

* Master merges

* orch

* weh

* vgroid most of the work

* Tweaks

* Tweaks

* weh

* do do do do do do

* Basic layout

* Ore spawning working

* Big breaking changes

* Mob gen working

* weh

* Finalising

* emo

* More finalising

* reverty

* Reduce distance

Content.Server/Procedural/DungeonSystem.Rooms.cs

@@ -64,6 +64,7 @@ public sealed partial class DungeonSystem
         Vector2i origin,
         DungeonRoomPrototype room,
         Random random,
+        HashSet<Vector2i>? reservedTiles,
         bool clearExisting = false,
         bool rotation = false)
     {
@@ -78,7 +79,7 @@ public sealed partial class DungeonSystem
         var roomTransform = Matrix3Helpers.CreateTransform((Vector2) room.Size / 2f, roomRotation);
         var finalTransform = Matrix3x2.Multiply(roomTransform, originTransform);
 
-        SpawnRoom(gridUid, grid, finalTransform, room, clearExisting);
+        SpawnRoom(gridUid, grid, finalTransform, room, reservedTiles, clearExisting);
     }
 
     public Angle GetRoomRotation(DungeonRoomPrototype room, Random random)
@@ -103,6 +104,7 @@ public sealed partial class DungeonSystem
         MapGridComponent grid,
         Matrix3x2 roomTransform,
         DungeonRoomPrototype room,
+        HashSet<Vector2i>? reservedTiles = null,
         bool clearExisting = false)
     {
         // Ensure the underlying template exists.
@@ -150,6 +152,10 @@ public sealed partial class DungeonSystem
 
                 var tilePos = Vector2.Transform(indices + tileOffset, roomTransform);
                 var rounded = tilePos.Floored();
+
+                if (!clearExisting && reservedTiles?.Contains(rounded) == true)
+                    continue;
+
                 _tiles.Add((rounded, tileRef.Tile));
             }
         }
@@ -165,6 +171,10 @@ public sealed partial class DungeonSystem
         {
             var templateXform = _xformQuery.GetComponent(templateEnt);
             var childPos = Vector2.Transform(templateXform.LocalPosition - roomCenter, roomTransform);
+
+            if (!clearExisting && reservedTiles?.Contains(childPos.Floored()) == true)
+                continue;
+
             var childRot = templateXform.LocalRotation + finalRoomRotation;
             var protoId = _metaQuery.GetComponent(templateEnt).EntityPrototype?.ID;
 
@@ -192,8 +202,11 @@ public sealed partial class DungeonSystem
                 // Offset by 0.5 because decals are offset from bot-left corner
                 // So we convert it to center of tile then convert it back again after transform.
                 // Do these shenanigans because 32x32 decals assume as they are centered on bottom-left of tiles.
-                var position = Vector2.Transform(decal.Coordinates + Vector2Helpers.Half - roomCenter, roomTransform);
-                position -= Vector2Helpers.Half;
+                var position = Vector2.Transform(decal.Coordinates + grid.TileSizeHalfVector - roomCenter, roomTransform);
+                position -= grid.TileSizeHalfVector;
+
+                if (!clearExisting && reservedTiles?.Contains(position.Floored()) == true)
+                    continue;
 
                 // Umm uhh I love decals so uhhhh idk what to do about this
                 var angle = (decal.Angle + finalRoomRotation).Reduced();