Resource Loading, Tile Mapper, and Biome Painter implementation

engine/world_generation/src/tile_mapper.rs

@@ -11,15 +11,30 @@ use crate::tile_manager::TileAsset;
 pub struct TileMapper;
 
 #[derive(Serialize, Deserialize, Debug, TypePath, Asset)]
-struct TileMapperAsset {
+pub struct TileMapperAsset {
 	#[serde(skip)]
 	pub tiles: Vec<Handle<TileAsset>>,
 	pub tiles_path: Vec<String>,
+	pub thresholds: Vec<f32>,
+}
+
+impl TileMapperAsset {
+	pub fn sample_tile(&self, height: f32) -> Handle<TileAsset> {
+		for i in 0..self.thresholds.len() {
+			let t = self.thresholds[i];
+			if t >= height {
+				return self.tiles[i].clone();
+			}
+		}
+		return self.tiles.last().unwrap().clone();
+	}
 }
 
 create_asset_loader!(
 	TileMapperAssetPlugin,
 	TileMapperAssetLoader,
 	TileMapperAsset,
-	&["mapper.json"],
+	&["mapper.json"],;
+	tiles_path -> tiles
+	?
 );