Biome blending

Dithering to biome edges

engine/world_generation/src/map/chunk.rs

@@ -8,6 +8,7 @@ pub struct Chunk {
 	pub heights: [f32; Chunk::AREA],
 	pub textures: [[u32; 2]; Chunk::AREA],
 	pub biome_data: [BiomeData; Chunk::AREA],
+	pub biome_id: [usize; Chunk::AREA],
 	pub chunk_offset: IVec2,
 }
 
@@ -17,6 +18,7 @@ impl Default for Chunk {
 			heights: [0.; Chunk::AREA],
 			textures: [[0; 2]; Chunk::AREA],
 			biome_data: [BiomeData::default(); Chunk::AREA],
+			biome_id: [0; Chunk::AREA],
 			chunk_offset: Default::default(),
 		}
 	}