diff --git a/fcore/player.sml b/fcore/player.sml
index 87a8af1..aab4e30 100644
--- a/fcore/player.sml
+++ b/fcore/player.sml
@@ -236,7 +236,7 @@ struct
           end
     end
 
-  (* placeholder *)
-  fun getDrawVec ({x, y, ...}: player) =
-    Block.lerp (x, y, realSize, realSize, 1920.0, 1080.0, 0.5, 0.5, 0.5)
+  (* block is placeholder asset *)
+  fun getDrawVec ({x, y, ...}: player, width, height) =
+    Block.lerp (x, y, realSize, realSize, width, height, 0.5, 0.5, 0.5)
 end
diff --git a/fcore/wall.sml b/fcore/wall.sml
index 6dfe571..7c288f8 100644
--- a/fcore/wall.sml
+++ b/fcore/wall.sml
@@ -23,6 +23,7 @@ struct
         val {x, y, width, height, id = _} = wall
         val width = Real32.fromInt width
         val height = Real32.fromInt height
+
         val block = Block.lerp
           (x, y, width, height, winWidth, winHeight, 0.0, 0.0, 0.0)
         val acc = block :: acc
@@ -30,6 +31,6 @@ struct
         helpGetDrawVec (pos + 1, wallVec, acc, winWidth, winHeight)
       end
 
-  fun getDrawVec wallVec =
-    helpGetDrawVec (0, wallVec, [], 1920.0, 1080.0)
+  fun getDrawVec (wallVec, width, height) =
+    helpGetDrawVec (0, wallVec, [], width, height)
 end
diff --git a/ffi/export.h b/ffi/export.h
index 83e8992..9c2eec7 100644
--- a/ffi/export.h
+++ b/ffi/export.h
@@ -158,6 +158,7 @@ extern "C" {
 #endif
 
 MLLIB_PUBLIC(void mltonKeyCallback (Int32 x0, Int32 x1, Int32 x2, Int32 x3);)
+MLLIB_PUBLIC(void mltonFramebufferSizeCallback (Real32 x0, Real32 x1);)
 
 #undef MLLIB_PRIVATE
 #undef MLLIB_PUBLIC
diff --git a/ffi/glfw-input.c b/ffi/glfw-input.c
index dd62dfc..dd873d5 100644
--- a/ffi/glfw-input.c
+++ b/ffi/glfw-input.c
@@ -18,3 +18,13 @@ void keyCallback(GLFWwindow* window, int key, int scancode, int action, int mods
 void setKeyCallback(GLFWwindow* window) {
   glfwSetKeyCallback(window, keyCallback);
 }
+
+void framebufferSizeCallback(GLFWwindow* window, int width, int height) {
+  glViewport(0, 0, width, height);
+  mltonFramebufferSizeCallback((float) width, (float) height);
+}
+
+void setFramebufferSizeCallback(GLFWwindow* window) {
+  glfwSetFramebufferSizeCallback(window, framebufferSizeCallback);
+}
+
diff --git a/ffi/glfw-input.sml b/ffi/glfw-input.sml
index 8e67975..5429f1c 100644
--- a/ffi/glfw-input.sml
+++ b/ffi/glfw-input.sml
@@ -31,4 +31,9 @@ struct
     _export "mltonKeyCallback" public : (int * int * int * int -> unit) -> unit;
   val setKeyCallback =
     _import "setKeyCallback" public : window -> unit;
+
+  val exportFramebufferSizeCallback =
+    _export "mltonFramebufferSizeCallback" public : (Real32.real * Real32.real -> unit) -> unit;
+  val setFramebufferSizeCallback =
+    _import "setFramebufferSizeCallback" public : window -> unit;
 end
diff --git a/shell/gl-draw.sml b/shell/gl-draw.sml
index ea286fa..8010024 100644
--- a/shell/gl-draw.sml
+++ b/shell/gl-draw.sml
@@ -154,10 +154,13 @@ struct
            * *)
 
           val input = InputState.getSnapshot ()
+          val width = InputState.getWidth ()
+          val height = InputState.getHeight ()
+
           val game = GameUpdate.update (game, input)
 
-          val wallVec = Wall.getDrawVec (#walls game)
-          val playerVec = Player.getDrawVec (#player game)
+          val wallVec = Wall.getDrawVec (#walls game, width, height)
+          val playerVec = Player.getDrawVec (#player game, width, height)
 
           val shellState = uploadWall (shellState, wallVec)
           val shellState = uploadPlayer (shellState, playerVec)
diff --git a/shell/input-state.sml b/shell/input-state.sml
index b32b5ba..aea37c6 100644
--- a/shell/input-state.sml
+++ b/shell/input-state.sml
@@ -6,6 +6,8 @@ struct
     , rightHeld = ref false
     , upHeld = ref false
     , downHeld = ref false
+    , width = ref (1920.0 : Real32.real)
+    , height = ref (1080.0 : Real32.real)
     }
 
   fun getSnapshot () =
@@ -15,19 +17,14 @@ struct
     , downHeld = !(#downHeld state)
     }
 
-  fun getPlayerXAxis () =
-    let
-      val lh = #leftHeld state
-      val rh = #rightHeld state
+  fun getWidth () =
+    !(#width state)
 
-      open Player
-    in
-      case (!lh, !rh) of
-        (false, false) => STAY_STILL
-      | (false, true) => MOVE_RIGHT
-      | (true, false) => MOVE_LEFT
-      | (true, true) => STAY_STILL
-    end
+  fun getHeight () =
+    !(#height state)
+
+  fun sizeCallback (width, height) =
+    (#width state := width; #height state := height)
 
   open Input
 
@@ -60,6 +57,9 @@ struct
     let
       val () = Input.exportKeyCallback keyCallback
       val () = Input.setKeyCallback window
+
+      val () = Input.exportFramebufferSizeCallback sizeCallback
+      val () = Input.setFramebufferSizeCallback window
     in
       ()
     end