add MaterialTileMappingJsonLoader

src/main/java/ca/blarg/gdx/tilemap3d/json/tilemesh/MaterialTileMappingJsonLoader.java

@@ -0,0 +1,52 @@
+package ca.blarg.gdx.tilemap3d.json.tilemesh;
+
+import ca.blarg.gdx.graphics.atlas.TextureAtlas;
+import ca.blarg.gdx.loaders.textureatlas.TextureAtlasJsonLoader;
+import ca.blarg.gdx.tilemap3d.tilemesh.MaterialTileMapping;
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.assets.AssetManager;
+import com.badlogic.gdx.files.FileHandle;
+import com.badlogic.gdx.utils.Json;
+
+public class MaterialTileMappingJsonLoader {
+	public static JsonMaterialMapping load(FileHandle file) {
+		Json json = new Json();
+		return json.fromJson(JsonMaterialMapping.class, file);
+	}
+
+	public static MaterialTileMapping create(JsonMaterialMapping definition) {
+		return create(definition, null);
+	}
+
+	public static MaterialTileMapping create(JsonMaterialMapping definition, AssetManager assetManager) {
+		if (definition.materials == null || definition.materials.size() == 0)
+			throw new RuntimeException("No material mappings defined.");
+
+		TextureAtlas atlas;
+		if (assetManager != null)
+			atlas = assetManager.get(definition.textureAtlas, TextureAtlas.class);
+		else
+			atlas = TextureAtlasJsonLoader.loadAndCreate(Gdx.files.internal(definition.textureAtlas));
+
+		MaterialTileMapping materialMapping = new MaterialTileMapping();
+		for (int i = 0; i < definition.materials.size(); ++i) {
+			JsonMaterialMapping.Material mapping = definition.materials.get(i);
+			materialMapping.add(
+				mapping.name, atlas.get(mapping.tile),
+				mapping.minU, mapping.maxU, mapping.minV, mapping.maxV
+			);
+		}
+
+		return materialMapping;
+	}
+
+	public static MaterialTileMapping loadAndCreate(FileHandle file) {
+		JsonMaterialMapping definition = load(file);
+		return create(definition);
+	}
+
+	public static MaterialTileMapping loadAndCreate(FileHandle file, AssetManager assetManager) {
+		JsonMaterialMapping definition = load(file);
+		return create(definition, assetManager);
+	}
+}