free opengl resources

app/src/main/java/chess/view/DDDrender/world/BoardEntity.java

@@ -1,5 +1,7 @@
 package chess.view.DDDrender.world;
 
+import java.io.IOException;
+
 import org.joml.Vector3f;
 
 import chess.model.Coordinate;
@@ -38,4 +40,9 @@ public class BoardEntity extends Entity {
 		renderer.RenderVao(renderer.getBoardShader(), vao);
 	}
 
+	@Override
+	public void close() throws IOException {
+		vao.close();
+	}
+
 }

app/src/main/java/chess/view/DDDrender/world/Entity.java

@@ -1,9 +1,11 @@
 package chess.view.DDDrender.world;
 
+import java.io.Closeable;
+
 import chess.view.DDDrender.Renderer;
 
-public abstract class Entity {
+public abstract class Entity implements Closeable{
 
 	public abstract void render(Renderer renderer);
-	
+
 }

app/src/main/java/chess/view/DDDrender/world/ModelEntity.java

@@ -1,5 +1,7 @@
 package chess.view.DDDrender.world;
 
+import java.io.IOException;
+
 import org.joml.Vector3f;
 
 import chess.view.DDDrender.DDDModel;
@@ -36,4 +38,9 @@ public class ModelEntity extends Entity {
 		this.rotation = rotation;
 	}
 
+	@Override
+	public void close() throws IOException {
+		this.model.close();
+	}
+
 }

app/src/main/java/chess/view/DDDrender/world/World.java

@@ -1,5 +1,7 @@
 package chess.view.DDDrender.world;
 
+import java.io.Closeable;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -7,7 +9,7 @@ import chess.model.Coordinate;
 import chess.model.Move;
 import chess.model.Piece;
 
-public class World {
+public class World implements Closeable{
 	/** Renderable entity list */
 	private final List<Entity> entites;
 
@@ -55,4 +57,11 @@ public class World {
 		return entites;
 	}
 
+	@Override
+	public void close() throws IOException {
+		for (Entity entity : entites) {
+			entity.close();
+		}
+	}
+
 }