Improve normal maps on ground and walls

src/Data/Preload/Render.hs

@@ -60,6 +60,8 @@ data RenderData = RenderData
     , _floorShader :: FullShader
     , _toNormalMaps :: TO
     , _toDiffuse :: TO
+    , _wallVBO :: VBO
+    , _wallShader :: FullShader
     }
 
 makeLenses ''RenderData