Add grass layer

Author: CuddlyBunion341

src/server/terrain/util/generator.rs

@@ -10,10 +10,10 @@ macro_rules! for_each_chunk_coordinate {
                     #[cfg(feature = "skip_chunk_padding")]
                     if x == 0
                         || x == CHUNK_SIZE + 1
-                        || y == 0
-                        || y == CHUNK_SIZE + 1
-                        || z == 0
-                        || z == CHUNK_SIZE + 1
+                            || y == 0
+                            || y == CHUNK_SIZE + 1
+                            || z == 0
+                            || z == CHUNK_SIZE + 1
                     {
                         continue;
                     }
@@ -52,6 +52,24 @@ impl Generator {
             let block = self.generate_block(block_position);
             chunk.set_unpadded(x, y, z, block);
         });
+
+        for_each_chunk_coordinate!(chunk, |x, y, z, _| {
+            let block = chunk.get_unpadded(x, y, z);
+
+            if block == BlockId::Stone {
+
+                let x = x as usize;
+                let y = y as usize;
+                let z = z as usize;
+
+                if Chunk::valid_unpadded(x,y + 1,z) {
+                    let top_block = chunk.get_unpadded(x, y + 1, z);
+                    if top_block == BlockId::Air {
+                        chunk.set_unpadded(x, y, z, BlockId::Grass);
+                    }
+                }
+            }
+        });
     }
 
     fn generate_block(&self, position: Vec3) -> BlockId {

src/shared/terrain.rs

@@ -24,6 +24,18 @@ impl Chunk {
         }
     }
 
+    pub fn valid_padded(x: usize, y: usize, z: usize) -> bool {
+        (x >= 1 && x < CHUNK_SIZE) && 
+        (y >= 1 && y < CHUNK_SIZE) && 
+        (z >= 1 && z < CHUNK_SIZE)
+    }
+
+    pub fn valid_unpadded(x: usize, y: usize, z: usize) -> bool {
+        x < PADDED_CHUNK_SIZE && 
+        y < PADDED_CHUNK_SIZE && 
+        z < PADDED_CHUNK_SIZE
+    }
+
     pub fn get(&self, x: usize, y: usize, z: usize) -> BlockId {
         self.get_unpadded(x + 1, y + 1, z + 1)
     }