Initial Commit

Assets/Scripts/World/ErosionPassJob.cs

@@ -0,0 +1,50 @@
+using Unity.Collections;
+using Unity.Jobs;
+using UnityEngine;
+
+namespace DefaultNamespace.World
+{
+	public struct ErosionPassJob : IJobParallelFor
+	{
+		public static int[][] emptyTable =
+		{
+			new[] { 0, 1, 1, 1, 1, 0, 1, -1, 0, -1 }, new[] { -1, 0, -1, 1, 0, 1, 1, 1, 1, 0 }, new[] { -1, 0, 1, 0, 0, 1, 0, -1 }
+		};
+
+		[ReadOnly] public NativeArray<int> readOnlyMap;
+		public NativeArray<int> map;
+		public Vector2Int size;
+
+		public void Execute(int index)
+		{
+			var pos = new Vector2Int(index % size.x, Mathf.FloorToInt(index / (float)size.x));
+
+			for (var i = 0; i < emptyTable.Length; i++)
+			{
+				var valid = true;
+				var table = emptyTable[i];
+
+				for (var j = 0; j < table.Length; j += 2)
+				{
+					var p = pos + new Vector2Int(table[j], table[j + 1]);
+					if (!p.InRange(size) || IsSolid(p))
+					{
+						valid = false;
+						break;
+					}
+				}
+
+				if (valid)
+				{
+					map[index] = 0;
+					break;
+				}
+			}
+		}
+
+		private bool IsSolid(Vector2Int pos)
+		{
+			return readOnlyMap[pos.y * size.x + pos.x] != 0;
+		}
+	}
+}