add automatic biome-based structures placement

src/world/generator/WorldGenerator.hpp

@@ -47,8 +47,6 @@ class WorldGenerator {
     /// @brief Chunk prototypes loading surround map
     SurroundMap surroundMap;
 
-    std::vector<std::array<std::shared_ptr<VoxelFragment>, 4>> structures;
-
     /// @brief Generate chunk prototype (see ChunkPrototype)
     /// @param x chunk position X divided by CHUNK_W
     /// @param z chunk position Y divided by CHUNK_D
@@ -61,6 +59,11 @@ class WorldGenerator {
     void generateBiomes(ChunkPrototype& prototype, int x, int z);
 
     void generateHeightmap(ChunkPrototype& prototype, int x, int z);
+
+    void placeStructure(
+        const glm::ivec3 offset, size_t structure, uint8_t rotation,
+        int chunkX, int chunkZ
+    );
 public:
     WorldGenerator(
         const GeneratorDef& def,