New Atlas + Texture Pipeline

World/Blocks/GrassBlock.cs

@@ -7,10 +7,10 @@ public sealed class GrassBlock : IBlock
     public bool IsOpaque => true;
     public bool IsSolid => true;
 
-    public int GetTextureIndex(BlockFace face) => face switch
+    public TileCoord GetTextureTile(BlockFace face) => face switch
     {
-        BlockFace.Top => 0,    // grass top
-        BlockFace.Bottom => 1, // dirt
-        _ => 3                 // grass side
+        BlockFace.Top => new(0, 1),    // grass top
+        BlockFace.Bottom => new(0, 0), // dirt
+        _ => new(1, 1)                 // grass side
     };
 }