refactor: river (#10)

* fix: correct snowy grass block texture

* refactor: river generation

* fix: water placement error due to interpolation

* perf: improve river naturalness

* feat: add river tab item

* fix: path truncation

src/gameplay/builders/biome_builder.cpp

@@ -15,27 +15,5 @@ void BiomeBuilder::build_bottom() {
         }
     }
 }
-void BiomeBuilder::fill_water() {
-    ChunkGenerator& chunk_generator = get_chunk_generator();
-    Chunk& chunk = chunk_generator.chunk();
-    auto& m_blocks = chunk.blocks();
-    auto& neighbor = chunk_generator.neighbor_biome();
-    auto& heightmap = chunk.heightmap();
-    for (int i = 0; i < 8; i++) {
-        if (neighbor[i] == BiomeType::RIVER) {
-            for (int x = 0; x < SIZE_X; x++) {
-                for (int z = 0; z < SIZE_Z; z++) {
-                    if (heightmap[x][z] >= SEA_LEVEL) {
-                        continue;
-                    }
-                    int height = heightmap[x][z];
-                    for (int y = height; y < SEA_LEVEL; y++) {
-                        m_blocks[Chunk::index(x, y, z)] = 7;
-                    }
-                }
-            }
-            return;
-        }
-    }
-}
+
 } // namespace Cubed