riversong code showcase

Source/Riversong/Game/WorldGen/ChunkGenerators/GrassTileMask.cs

@@ -0,0 +1,16 @@
+using Unity.Collections;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    public struct GrassTileMask : IGrassTileMask
+    {
+        public NativeArray<int> Heightmap;
+
+        public NativeArray<FertilityMapValue> Fertility;
+
+        public bool CanGenerateAtTile(int tileIndex)
+        {
+            return Heightmap[tileIndex] > 0 && Fertility[tileIndex].MaxFertility == 0;
+        }
+    }
+}