diff --git a/oms.mlb b/oms.mlb
index 79d9932..810912c 100644
--- a/oms.mlb
+++ b/oms.mlb
@@ -63,6 +63,12 @@ in
   ffi/glfw-input.sml
 end
 
+ann
+  "allowVectorExps true"
+in
+  shell/glfw-key-map.sml
+end
+
 shell/input-state.sml
 shell/gl-shaders.sml
 shell/gl-draw.sml
diff --git a/shell/glfw-key-map.sml b/shell/glfw-key-map.sml
new file mode 100644
index 0000000..9050401
--- /dev/null
+++ b/shell/glfw-key-map.sml
@@ -0,0 +1,162 @@
+structure GlfwKeyMap =
+struct
+  open CoreKey
+
+  structure KeyMap =
+    MakeGapMap
+      (struct
+         type key = int
+         type value = CoreKey.key_code
+
+         fun l (a: int, b: int) = a < b
+         fun eq (a: int, b: int) = a = b
+         fun g (a: int, b: int) = a > b
+
+         val maxNodeSize = 1024
+       end)
+
+  val map = ref KeyMap.empty
+
+  fun codeFromKey (key: int) =
+    KeyMap.get (key, !map)
+
+  fun helpInitKeyMap (pos, pairs, acc) =
+    if pos = Vector.length pairs then
+      map := acc
+    else
+      let
+        val (code, key) = Vector.sub (pairs, pos)
+        val acc = KeyMap.add (code, key, acc)
+      in
+        helpInitKeyMap (pos + 1, pairs, acc)
+      end
+
+  fun initKeyMap () =
+    let
+      (* vector of (glfw_key_code, Core.key_code) tuples. *)
+      val pairs =
+       #[ (32, KEY_SPACE)
+        , (39, KEY_APOSTROPHE)
+        , (44, KEY_COMMA)
+        , (45, KEY_MINUS)
+        , (46, KEY_PERIOD)
+        , (47, KEY_SLASH)
+        , (48, KEY_0)
+        , (49, KEY_1)
+        , (50, KEY_2)
+        , (51, KEY_3)
+        , (52, KEY_4)
+        , (53, KEY_5)
+        , (54, KEY_6)
+        , (55, KEY_7)
+        , (56, KEY_8)
+        , (57, KEY_9)
+        , (59, KEY_SEMICOLON)
+        , (61, KEY_EQUAL)
+        , (65, KEY_A)
+        , (66, KEY_B)
+        , (67, KEY_C)
+        , (68, KEY_D)
+        , (69, KEY_E)
+        , (70, KEY_F)
+        , (71, KEY_G)
+        , (72, KEY_H)
+        , (73, KEY_I)
+        , (74, KEY_J)
+        , (75, KEY_K)
+        , (76, KEY_L)
+        , (77, KEY_M)
+        , (78, KEY_N)
+        , (79, KEY_O)
+        , (80, KEY_P)
+        , (81, KEY_Q)
+        , (82, KEY_R)
+        , (83, KEY_S)
+        , (84, KEY_T)
+        , (85, KEY_U)
+        , (86, KEY_V)
+        , (87, KEY_W)
+        , (88, KEY_X)
+        , (89, KEY_Y)
+        , (90, KEY_Z)
+        , (91, KEY_LEFT_BRACKET)
+        , (92, KEY_BACKSLASH)
+        , (93, KEY_RIGHT_BRACKET)
+        , (96, KEY_GRAVE_ACCENT)
+        , (161, KEY_WORLD_1)
+        , (162, KEY_WORLD_2)
+        , (256, KEY_ESCAPE)
+        , (257, KEY_ENTER)
+        , (258, KEY_TAB)
+        , (259, KEY_BACKSPACE)
+        , (260, KEY_INSERT)
+        , (261, KEY_DELETE)
+        , (262, KEY_RIGHT)
+        , (263, KEY_LEFT)
+        , (264, KEY_DOWN)
+        , (265, KEY_UP)
+        , (266, KEY_PAGE_UP)
+        , (267, KEY_PAGE_DOWN)
+        , (268, KEY_HOME)
+        , (269, KEY_END)
+        , (280, KEY_CAPS_LOCK)
+        , (281, KEY_SCROLL_LOCK)
+        , (282, KEY_NUM_LOCK)
+        , (283, KEY_PRINT_SCREEN)
+        , (284, KEY_PAUSE)
+        , (290, KEY_F1)
+        , (291, KEY_F2)
+        , (292, KEY_F3)
+        , (293, KEY_F4)
+        , (294, KEY_F5)
+        , (295, KEY_F6)
+        , (296, KEY_F7)
+        , (297, KEY_F8)
+        , (298, KEY_F9)
+        , (299, KEY_F10)
+        , (300, KEY_F11)
+        , (301, KEY_F12)
+        , (302, KEY_F13)
+        , (303, KEY_F14)
+        , (304, KEY_F15)
+        , (305, KEY_F16)
+        , (306, KEY_F17)
+        , (307, KEY_F18)
+        , (308, KEY_F19)
+        , (309, KEY_F20)
+        , (310, KEY_F21)
+        , (311, KEY_F22)
+        , (312, KEY_F23)
+        , (313, KEY_F24)
+        , (314, KEY_F25)
+        , (320, KEY_KP_0)
+        , (321, KEY_KP_1)
+        , (322, KEY_KP_2)
+        , (323, KEY_KP_3)
+        , (324, KEY_KP_4)
+        , (325, KEY_KP_5)
+        , (326, KEY_KP_6)
+        , (327, KEY_KP_7)
+        , (328, KEY_KP_8)
+        , (329, KEY_KP_9)
+        , (330, KEY_KP_DECIMAL)
+        , (331, KEY_KP_DIVIDE)
+        , (332, KEY_KP_MULTIPLY)
+        , (333, KEY_KP_SUBTRACT)
+        , (334, KEY_KP_ADD)
+        , (335, KEY_KP_ENTER)
+        , (336, KEY_KP_EQUAL)
+        , (340, KEY_LEFT_SHIFT)
+        , (341, KEY_LEFT_CONTROL)
+        , (342, KEY_LEFT_ALT)
+        , (343, KEY_LEFT_SUPER)
+        , (344, KEY_RIGHT_SHIFT)
+        , (345, KEY_RIGHT_CONTROL)
+        , (346, KEY_RIGHT_ALT)
+        , (347, KEY_RIGHT_SUPER)
+        , (348, KEY_MENU)
+        ]
+    in
+      KeyMap.empty
+    end
+end