diff --git a/engine/mobility_int.h b/engine/mobility_int.h
new file mode 100644
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--- /dev/null
+++ b/engine/mobility_int.h
@@ -0,0 +1,90 @@
+/*
+mobility_int.h - interface between engine and client for mobile platforms
+Copyright (C) 2015 a1batross
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+*/
+
+#pragma once
+#ifndef MOBILITY_INT_H
+#define MOBILITY_INT_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define MOBILITY_API_VERSION 2
+#define MOBILITY_CLIENT_EXPORT "HUD_MobilityInterface"
+
+#define VIBRATE_NORMAL (1U << 0) // just vibrate for given "life"
+
+#define TOUCH_FL_HIDE			(1U << 0)
+#define TOUCH_FL_NOEDIT			(1U << 1)
+#define TOUCH_FL_CLIENT			(1U << 2)
+#define TOUCH_FL_MP				(1U << 3)
+#define TOUCH_FL_SP				(1U << 4)
+#define TOUCH_FL_DEF_SHOW		(1U << 5)
+#define TOUCH_FL_DEF_HIDE		(1U << 6)
+#define TOUCH_FL_DRAW_ADDITIVE	(1U << 7)
+#define TOUCH_FL_STROKE			(1U << 8)
+#define TOUCH_FL_PRECISION		(1U << 9)
+
+typedef struct mobile_engfuncs_s
+{
+	// indicates version of API. Should be equal to MOBILITY_API_VERSION
+	// version changes when existing functions are changes
+	int version;
+
+	// vibration control
+	// life -- time to vibrate in ms
+	void (*pfnVibrate)( float life, char flags );
+
+	// enable text input
+	void (*pfnEnableTextInput)( int enable );
+
+	// add temporaty button, edit will be disabled
+	void (*pfnTouchAddClientButton)( const char *name, const char *texture, const char *command, float x1, float y1, float x2, float y2, unsigned char *color, int round, float aspect, int flags );
+
+	// add button to defaults list. Will be loaded on config generation
+	void (*pfnTouchAddDefaultButton)( const char *name, const char *texturefile, const char *command, float x1, float y1, float x2, float y2, unsigned char *color, int round, float aspect, int flags );
+
+	// hide/show buttons by pattern
+	void (*pfnTouchHideButtons)( const char *name, unsigned char hide );
+
+	// remove button with given name
+	void (*pfnTouchRemoveButton)( const char *name );
+
+	// when enabled, only client buttons shown
+	void (*pfnTouchSetClientOnly)( unsigned char state );
+
+	// Clean defaults list
+	void (*pfnTouchResetDefaultButtons)( void );
+
+	// Draw scaled font for client
+	int (*pfnDrawScaledCharacter)( int x, int y, int number, int r, int g, int b, float scale );
+
+	void (*pfnSys_Warn)( const char *format, ... );
+
+	// Get native object for current platform.
+	// Pass NULL to arguments to receive an array of available objects or NULL if nothing
+	void *(*pfnGetNativeObject)( const char *obj );
+
+	void (*pfnSetCustomClientID)( const char *id );
+	// To be continued...
+} mobile_engfuncs_t;
+
+// function exported from client
+// returns 0 on no error otherwise error
+typedef int (*pfnMobilityInterface)( mobile_engfuncs_t *gMobileEngfuncs );
+
+#ifdef __cplusplus
+}
+#endif
+#endif