Add tile graphic

src/world.rs

@@ -1,4 +1,5 @@
 use fnv::FnvHashMap;
+use rand::{thread_rng, Rng};
 
 type ChunkPosScalar = i16;
 
@@ -12,6 +13,14 @@ pub struct World {
     chunks: FnvHashMap<ChunkPos, Chunk>,
 }
 
+impl Default for World {
+    fn default() -> Self {
+        Self {
+            chunks: Default::default(),
+        }
+    }
+}
+
 const CHUNK_EXTENT: u16 = 256;
 const CHUNK_N_BLOCKS: usize = CHUNK_EXTENT as usize * CHUNK_EXTENT as usize;
 
@@ -21,8 +30,20 @@ pub struct Chunk {
     blocks: ChunkBlocks,
 }
 
+impl Chunk {
+    pub fn new_rand() -> Self {
+        let mut rng = thread_rng();
+        let mut blocks = [Block { id: 0 }; CHUNK_N_BLOCKS];
+        for b in &mut blocks {
+            b.id = rng.gen();
+        }
+        Self { blocks }
+    }
+}
+
 type BlockId = u16;
 
+#[derive(Clone, Copy)]
 pub struct Block {
     id: BlockId,
 }