generating wood caves

1 files changed, 10 insertions, 6 deletions

diff --git a/src/sim/cell_manager/manager.rs b/src/sim/cell_manager/manager.rs
index 64b97f1..c8015f7 100644
--- a/src/sim/cell_manager/manager.rs
+++ b/src/sim/cell_manager/manager.rs
@@ -48,10 +48,14 @@ impl CellManager {
         }
     }
 
-    pub fn insert(&mut self, x: i32, y: i32, chunk: Chunk) {
-        self.chunk_position_to_chunk_idx
-            .insert((x, y), self.chunks.len());
-        self.chunks.push(chunk);
+    pub fn upsert(&mut self, x: i32, y: i32, chunk: Chunk) {
+        if let Some(&idx) = self.chunk_position_to_chunk_idx.get(&(x, y)) {
+            self.chunks[idx] = chunk;
+        } else {
+            self.chunk_position_to_chunk_idx
+                .insert((x, y), self.chunks.len());
+            self.chunks.push(chunk);
+        }
     }
 
     pub fn tick(&mut self, use_threading: bool) {
@@ -70,9 +74,9 @@ impl CellManager {
         for y in -10..1 {
             for x in -100..100 {
                 if y == 0 {
-                    world.insert(x, y, Chunk::floor());
+                    world.upsert(x, y, Chunk::floor());
                 } else {
-                    world.insert(x, y, Chunk::void());
+                    world.upsert(x, y, Chunk::void());
                 }
             }
         }