Spawn point system.

Hey we can place spawn points on the map now instead of hardcoding them!
Spawn points are simply invisible bare bones entities.

Content.Server/Content.Server.csproj

@@ -80,6 +80,7 @@
     <Compile Include="GameObjects\Components\Items\Storage\StoreableComponent.cs" />
     <Compile Include="GameObjects\Components\Items\Storage\ServerStorageComponent.cs" />
     <Compile Include="GameObjects\Components\Items\Storage\ItemComponent.cs" />
+    <Compile Include="GameObjects\Components\Markers\SpawnPointComponent.cs" />
     <Compile Include="GameObjects\Components\Mobs\DamageStates.cs" />
     <Compile Include="GameObjects\Components\Mobs\DamageThresholdTemplates\DamageThresholdTemplates.cs" />
     <Compile Include="GameObjects\Components\Mobs\DamageThresholdTemplates\HumanTemplate.cs" />

Content.Server/EntryPoint.cs

@@ -34,11 +34,13 @@ using Content.Server.GameObjects.EntitySystems;
 using Content.Server.Mobs;
 using Content.Server.Players;
 using Content.Server.GameObjects.Components.Interactable;
+using Content.Server.GameObjects.Components.Markers;
 using Content.Server.GameObjects.Components.Weapon.Ranged;
 using Content.Server.GameTicking;
 using Content.Server.Interfaces;
 using Content.Server.Interfaces.GameTicking;
 using Content.Shared.GameObjects.Components.Inventory;
+using Content.Shared.GameObjects.Components.Markers;
 using Content.Shared.Interfaces;
 using SS14.Server.Interfaces.ServerStatus;
 using SS14.Shared.Timing;
@@ -119,6 +121,9 @@ namespace Content.Server
             factory.Register<MindComponent>();
             factory.Register<SpeciesComponent>();
 
+            factory.Register<SpawnPointComponent>();
+            factory.RegisterReference<SpawnPointComponent, SharedSpawnPointComponent>();
+
             IoCManager.Register<ISharedNotifyManager, ServerNotifyManager>();
             IoCManager.Register<IServerNotifyManager, ServerNotifyManager>();
             IoCManager.Register<IGameTicker, GameTicker>();

Content.Server/GameObjects/Components/Markers/SpawnPointComponent.cs

@@ -0,0 +1,28 @@
+using System;
+using Content.Shared.GameObjects.Components.Markers;
+using SS14.Shared.GameObjects;
+using SS14.Shared.Serialization;
+using SS14.Shared.ViewVariables;
+
+namespace Content.Server.GameObjects.Components.Markers
+{
+    public sealed class SpawnPointComponent : SharedSpawnPointComponent
+    {
+        private SpawnPointType _spawnType;
+        [ViewVariables]
+        public SpawnPointType SpawnType => _spawnType;
+
+        public override void ExposeData(ObjectSerializer serializer)
+        {
+            base.ExposeData(serializer);
+
+            serializer.DataField(ref _spawnType, "spawn_type", SpawnPointType.Unset);
+        }
+    }
+
+    public enum SpawnPointType
+    {
+        Unset = 0,
+        LateJoin,
+    }
+}

Content.Server/GameTicking/GameTicker.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using Content.Server.GameObjects;
+using Content.Server.GameObjects.Components.Markers;
 using Content.Server.GameTicking.GamePresets;
 using Content.Server.Interfaces.GameTicking;
 using Content.Server.Mobs;
@@ -16,6 +17,7 @@ using SS14.Server.Player;
 using SS14.Shared.Configuration;
 using SS14.Shared.Console;
 using SS14.Shared.Enums;
+using SS14.Shared.GameObjects;
 using SS14.Shared.Interfaces.Configuration;
 using SS14.Shared.Interfaces.GameObjects;
 using SS14.Shared.Interfaces.Map;
@@ -75,6 +77,8 @@ namespace Content.Server.GameTicking
         [ViewVariables] private bool _roundStartCountdownHasNotStartedYetDueToNoPlayers;
         private DateTime _roundStartTimeUtc;
 
+        private readonly Random _spawnRandom = new Random();
+
 #pragma warning disable 649
         [Dependency] private IEntityManager _entityManager;
         [Dependency] private IMapManager _mapManager;
@@ -217,7 +221,7 @@ namespace Content.Server.GameTicking
 
         private IEntity _spawnPlayerMob()
         {
-            var entity = _entityManager.ForceSpawnEntityAt(PlayerPrototypeName, _spawnPoint);
+            var entity = _entityManager.ForceSpawnEntityAt(PlayerPrototypeName, _getLateJoinSpawnPoint());
             var shoes = _entityManager.SpawnEntity("ShoesItem");
             var uniform = _entityManager.SpawnEntity("UniformAssistant");
             if (entity.TryGetComponent(out InventoryComponent inventory))
@@ -231,7 +235,29 @@ namespace Content.Server.GameTicking
 
         private IEntity _spawnObserverMob()
         {
-            return _entityManager.ForceSpawnEntityAt(ObserverPrototypeName, _spawnPoint);
+            return _entityManager.ForceSpawnEntityAt(ObserverPrototypeName, _getLateJoinSpawnPoint());
+        }
+
+        private GridCoordinates _getLateJoinSpawnPoint()
+        {
+            var location = _spawnPoint;
+
+            var possiblePoints = new List<GridCoordinates>();
+            foreach (var entity in _entityManager.GetEntities(new TypeEntityQuery(typeof(SpawnPointComponent))))
+            {
+                var point = entity.GetComponent<SpawnPointComponent>();
+                if (point.SpawnType == SpawnPointType.LateJoin)
+                {
+                    possiblePoints.Add(entity.Transform.GridPosition);
+                }
+            }
+
+            if (possiblePoints.Count != 0)
+            {
+                location = _spawnRandom.Pick(possiblePoints);
+            }
+
+            return location;
         }
 
         /// <summary>