Upgraded to latest Piston

src/app.rs

@@ -5,6 +5,10 @@ use piston::*;
 use board::Board;
 use number_renderer::NumberRenderer;
 use settings::Settings;
+use opengl_graphics::{
+    Gl,
+    Texture,
+};
 
 pub struct App<'a> {
     board: Board<'a>,

src/board.rs

@@ -4,6 +4,9 @@ use std::collections::hashmap::HashSet;
 use std::rand::random;
 use graphics::*;
 use piston::*;
+use opengl_graphics::{
+    Gl,
+};
 use number_renderer::NumberRenderer;
 use settings::Settings;
 use tile::{

src/main.rs

@@ -5,8 +5,11 @@ extern crate serialize;
 
 extern crate graphics;
 extern crate piston;
+extern crate opengl_graphics;
+extern crate sdl2_game_window;
 
 use piston::*;
+use sdl2_game_window::GameWindowSDL2;
 
 mod app;
 mod board;

src/number_renderer.rs

@@ -3,6 +3,10 @@ use graphics::*;
 use piston::{
     AssetStore,
 };
+use opengl_graphics::{
+    Gl,
+    Texture,
+};
 
 static DIGITS_WIDTH: f64 = 20.0;
 static DIGITS_HEIGHT: f64 = 26.0;

src/tile.rs

@@ -1,6 +1,7 @@
 
 use graphics::*;
 use piston::*;
+use opengl_graphics::Gl;
 use number_renderer::NumberRenderer;
 use settings::Settings;