implement blocks data saving/loading

src/voxels/Chunk.hpp

@@ -18,6 +18,8 @@ class Inventory;
 using chunk_inventories_map =
     std::unordered_map<uint, std::shared_ptr<Inventory>>;
 
+using BlocksMetadata = util::SmallHeap<uint16_t, uint8_t>;
+
 class Chunk {
 public:
     int x, z;
@@ -32,12 +34,13 @@ public:
         bool unsaved : 1;
         bool loadedLights : 1;
         bool entities : 1;
+        bool blocksData : 1;
     } flags {};
 
     /// @brief Block inventories map where key is index of block in voxels array
     chunk_inventories_map inventories;
     /// @brief Blocks metadata heap
-    util::SmallHeap<uint16_t, uint8_t> blocksMetadata;
+    BlocksMetadata blocksMetadata;
 
     Chunk(int x, int z);
 

src/voxels/Chunks.cpp

@@ -383,7 +383,11 @@ void Chunks::set(
         eraseSegments(prevdef, vox.state, gx, y, gz);
     }
     if (prevdef.dataStruct) {
-        chunk->blocksMetadata.free(chunk->blocksMetadata.find(index));
+        if (auto found = chunk->blocksMetadata.find(index)) {
+            chunk->blocksMetadata.free(found);
+            chunk->flags.unsaved = true;
+            chunk->flags.blocksData = true;
+        }
     }
 
     // block initialization

src/voxels/ChunksStorage.cpp

@@ -81,6 +81,7 @@ std::shared_ptr<Chunk> ChunksStorage::create(int x, int z) {
         chunk->lightmap.set(lights.get());
         chunk->flags.loadedLights = true;
     }
+    chunk->blocksMetadata = regions.getBlocksData(chunk->x, chunk->z);
     return chunk;
 }