feat: grass (#11)

* feat: add grass texture and update grass_block texture

* feat: add block data

* feat: add blocks_tool

* feat: add sync info and change function in blocks_tools

* feat: add check and new function

* refactor: make block texture loading data-driven

* feat: add rendering for grass

* feat: passable grass

* feat: random grass place

* fix: memory leak in TextureManager::load_cross_plane_texture

src/gameplay/builders/biome_builder.cpp

@@ -15,5 +15,28 @@ void BiomeBuilder::build_bottom() {
         }
     }
 }
-
+void BiomeBuilder::place_grass() {
+    ChunkGenerator& chunk_generator = get_chunk_generator();
+    Chunk& chunk = chunk_generator.chunk();
+    auto& blocks = chunk.blocks();
+    const auto& heightmap = chunk.get_heightmap();
+    auto& random = chunk_generator.random();
+    for (int x = 0; x < SIZE_X; ++x) {
+        for (int z = 0; z < SIZE_Z; ++z) {
+            int y = heightmap[x][z];
+            BlockType top_id = blocks[Chunk::index(x, y, z)];
+            if (top_id != 1) {
+                continue;
+            }
+            if (blocks[Chunk::index(x, y + 1, z)] != 0) {
+                continue;
+            }
+            if (random.random_bool(0.2)) {
+                if (y + 1 < SIZE_Y) {
+                    blocks[Chunk::index(x, y + 1, z)] = 9;
+                }
+            }
+        }
+    }
+}
 } // namespace Cubed