Initial HID PAD work, with GLFW only.

src/common/key_map.cpp

@@ -0,0 +1,21 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include "key_map.h"
+#include <map>
+
+
+namespace KeyMap {
+
+std::map<CitraKey, HID_User::PADState> g_key_map;
+
+void SetKeyMapping(CitraKey key, HID_User::PADState padState) {
+    g_key_map[key].hex = padState.hex;
+}
+
+HID_User::PADState Get3DSKey(CitraKey key) {
+    return g_key_map[key];
+}
+
+}