Fixed Chunk.Has (#167)

* Fixed Has

* Update comment

* This is the comment

* Source gen Has fixed

src/Arch.SourceGen/Fundamentals/Has.cs

@@ -31,7 +31,7 @@ public static StringBuilder AppendChunkHas(this StringBuilder sb, int amount)
         var ifs = new StringBuilder();
         for (var index = 0; index <= amount; index++)
         {
-            ifs.AppendLine($"if (ComponentIdToArrayIndex[t{index}ComponentId] != 1) return false;");
+            ifs.AppendLine($"if (ComponentIdToArrayIndex[t{index}ComponentId] == -1) return false;");
         }
 
         var template =

src/Arch.Tests/ChunkTest.cs

@@ -116,4 +116,28 @@ public void ChunkRemoveAndSetAgain()
         That(_chunk.Entities[0].Id, Is.EqualTo(2)); // Needs to be 1, because it will be the last one getting removed and being moved to that position
         That(_chunk.Entities[1].Id, Is.EqualTo(1)); // Needs to be 1, because it will be the last one getting removed and being moved to that position
     }
+
+    /// <summary>
+    ///     Checks if chunk has a component.
+    /// </summary>
+    [Test]
+    public void ChunkHas()
+    {
+        _chunk = new Chunk(1000, _types);
+
+        for (var index = 0; index < _chunk.Capacity; index++)
+        {
+            var entity = new Entity(index, 0);
+            _chunk.Add(entity);
+
+            var t = new Transform();
+            var r = new Rotation();
+            _chunk.Set(index, t);
+            _chunk.Set(index, r);
+        }
+
+        That(_chunk.Has<Transform>(), Is.True);
+        That(_chunk.Has<Ai>(), Is.False);
+        That(_chunk.Has<Rotation>(), Is.True);
+    }
 }

src/Arch/Core/Chunk.cs

@@ -116,7 +116,7 @@ public void Set<T>(int index, in T cmp)
     public bool Has<T>()
     {
         var id = Component<T>.ComponentType.Id;
-        return id < ComponentIdToArrayIndex.Length && ComponentIdToArrayIndex[id] != 1;
+        return id < ComponentIdToArrayIndex.Length && ComponentIdToArrayIndex[id] != -1;
     }
 
     /// <summary>