new file mode 100644
--- /dev/null
+++ b/pytouhou/lib/gui.pyx
@@ -0,0 +1,45 @@
+# Events
+EXIT = 1
+PAUSE = 2
+SCREENSHOT = 3
+RESIZE = 4
+FULLSCREEN = 5
+DOWN = 6
+
+# Possible keystates.
+SHOOT = 1
+BOMB = 2
+FOCUS = 4
+# ??
+UP = 16
+DOWN = 32
+LEFT = 64
+RIGHT = 128
+SKIP = 256
+
+
+class Error(Exception):
+    pass
+
+
+cdef class Window:
+    cdef void create_gl_context(self) except *:
+        pass
+
+    cdef void present(self) nogil:
+        pass
+
+    cdef void set_window_size(self, int width, int height) nogil:
+        pass
+
+    cdef void set_swap_interval(self, int interval) except *:
+        pass
+
+    cdef list get_events(self):
+        return []
+
+    cdef int get_keystate(self) nogil:
+        return 0
+
+    cdef void toggle_fullscreen(self) nogil:
+        pass