diff --git a/engine/gf_client.c b/engine/gf_client.c
index a67018a..01a367b 100644
--- a/engine/gf_client.c
+++ b/engine/gf_client.c
@@ -1,4 +1,5 @@
 #define GF_EXPOSE_CLIENT
+#define GF_EXPOSE_DRAW
 
 #include <gf_pre.h>
 
@@ -10,6 +11,7 @@
 /* Engine */
 #include <gf_draw.h>
 #include <gf_log.h>
+#include <gf_input.h>
 
 /* Standard */
 #include <stdlib.h>
@@ -29,11 +31,14 @@ gf_client_t* gf_client_create(gf_engine_t* engine, const char* title) {
 		gf_client_destroy(client);
 		return NULL;
 	}
+	client->input = gf_input_create(engine);
+	gf_draw_set_input(client->draw, client->input);
 	return client;
 }
 
 void gf_client_destroy(gf_client_t* client) {
 	if(client->draw != NULL) gf_draw_destroy(client->draw);
+	if(client->input != NULL) gf_input_destroy(client->input);
 	gf_log_function(client->engine, "Destroyed client interface", "");
 	free(client);
 }
diff --git a/engine/gf_draw_common.c b/engine/gf_draw_common.c
index 1200f7b..13fe4f0 100644
--- a/engine/gf_draw_common.c
+++ b/engine/gf_draw_common.c
@@ -121,3 +121,5 @@ void gf_draw_destroy(gf_draw_t* draw) {
 	gf_log_function(draw->engine, "Destroyed drawing interface", "");
 	free(draw);
 }
+
+void gf_draw_set_input(gf_draw_t* draw, gf_input_t* input) { draw->input = input; }
diff --git a/engine/gf_gui.c b/engine/gf_gui.c
index 7306bf6..1df23d8 100644
--- a/engine/gf_gui.c
+++ b/engine/gf_gui.c
@@ -1,4 +1,6 @@
 #define GF_EXPOSE_GUI
+#define GF_EXPOSE_DRAW
+#define GF_EXPOSE_INPUT
 
 #include <gf_pre.h>
 
diff --git a/engine/gf_input.c b/engine/gf_input.c
index b560743..9ed1bc5 100644
--- a/engine/gf_input.c
+++ b/engine/gf_input.c
@@ -1,3 +1,5 @@
+#define GF_EXPOSE_INPUT
+
 #include <gf_pre.h>
 
 /* External library */
@@ -6,5 +8,24 @@
 #include <gf_input.h>
 
 /* Engine */
+#include <gf_log.h>
 
 /* Standard */
+#include <stdlib.h>
+#include <string.h>
+
+gf_input_t* gf_input_create(gf_engine_t* engine) {
+	gf_input_t* input = malloc(sizeof(*input));
+	memset(input, 0, sizeof(input));
+	input->engine = engine;
+
+	input->mouse_x = 0;
+	input->mouse_y = 0;
+
+	return input;
+}
+
+void gf_input_destroy(gf_input_t* input) {
+	gf_log_function(input->engine, "Destroyed input interface", "");
+	free(input);
+}
diff --git a/engine/graphic/opengl/glfw/gf_draw.c b/engine/graphic/opengl/glfw/gf_draw.c
index 269de0a..62a1de8 100644
--- a/engine/graphic/opengl/glfw/gf_draw.c
+++ b/engine/graphic/opengl/glfw/gf_draw.c
@@ -1,5 +1,6 @@
 #define GF_EXPOSE_DRAW_PLATFORM
 #define GF_EXPOSE_DRAW
+#define GF_EXPOSE_INPUT
 
 #include <gf_pre.h>
 
@@ -13,6 +14,7 @@
 #include <gf_draw_driver.h>
 #include <gf_log.h>
 #include <gf_draw.h>
+#include <gf_input.h>
 
 /* Standard */
 #include <string.h>
@@ -36,6 +38,14 @@ void gf_glfw_size(GLFWwindow* window, int w, int h) {
 	gf_draw_reshape(draw);
 }
 
+void gf_glfw_cursor(GLFWwindow* window, double x, double y) {
+	gf_draw_t* draw = (gf_draw_t*)glfwGetWindowUserPointer(window);
+	if(draw->input != NULL) {
+		draw->input->mouse_x = x;
+		draw->input->mouse_y = y;
+	}
+}
+
 int gf_draw_platform_has_extension(gf_draw_t* draw, const char* query) {
 	const char* ext = NULL;
 	const char* ptr;
@@ -76,6 +86,7 @@ gf_draw_platform_t* gf_draw_platform_create(gf_engine_t* engine, gf_draw_t* draw
 	}
 
 	glfwSetWindowUserPointer(platform->window, draw);
+	glfwSetCursorPosCallback(platform->window, gf_glfw_cursor);
 	glfwSetWindowSizeCallback(platform->window, gf_glfw_size);
 
 	glfwMakeContextCurrent(platform->window);
diff --git a/engine/graphic/opengl/glx/gf_draw.c b/engine/graphic/opengl/glx/gf_draw.c
index fb1e7ea..be483b1 100644
--- a/engine/graphic/opengl/glx/gf_draw.c
+++ b/engine/graphic/opengl/glx/gf_draw.c
@@ -1,5 +1,6 @@
 #define GF_EXPOSE_DRAW_PLATFORM
 #define GF_EXPOSE_DRAW
+#define GF_EXPOSE_INPUT
 
 #include <gf_pre.h>
 
@@ -11,6 +12,7 @@
 
 /* Engine */
 #include <gf_draw_driver.h>
+#include <gf_input.h>
 #include <gf_log.h>
 #include <gf_draw.h>
 
@@ -158,6 +160,11 @@ int gf_draw_platform_step(gf_draw_t* draw) {
 		XNextEvent(draw->platform->display, &event);
 		if(event.type == Expose) {
 			break;
+		} else if(event.type == MotionNotify) {
+			if(draw->input != NULL) {
+				draw->input->mouse_x = event.xmotion.x;
+				draw->input->mouse_y = event.xmotion.y;
+			}
 		} else if(event.type == ConfigureNotify) {
 			draw->x	     = event.xconfigure.x;
 			draw->y	     = event.xconfigure.y;
diff --git a/engine/include/gf_draw.h b/engine/include/gf_draw.h
index f486c2f..1eeea24 100644
--- a/engine/include/gf_draw.h
+++ b/engine/include/gf_draw.h
@@ -16,6 +16,7 @@
 
 /* Engine */
 #include <gf_type/core.h>
+#include <gf_type/input.h>
 
 /* Standard */
 
@@ -35,6 +36,14 @@ GF_EXPORT gf_draw_t* gf_draw_create(gf_engine_t* engine, const char* title);
  */
 GF_EXPORT void gf_draw_destroy(gf_draw_t* draw);
 
+/**
+ * @~english
+ * @brief Set input interface
+ * @param draw Drawing interface
+ * @param input Input interface
+ */
+GF_EXPORT void gf_draw_set_input(gf_draw_t* draw, gf_input_t* input);
+
 /**
  * @~english
  * @brief Draw frame (common part)
diff --git a/engine/include/gf_draw_driver.h b/engine/include/gf_draw_driver.h
index ea05fdb..700c14f 100644
--- a/engine/include/gf_draw_driver.h
+++ b/engine/include/gf_draw_driver.h
@@ -19,6 +19,7 @@
 #include <gf_type/texture.h>
 #include <gf_type/graphic.h>
 #include <gf_type/core.h>
+#include <gf_type/input.h>
 
 /* Standard */
 
diff --git a/engine/include/gf_input.h b/engine/include/gf_input.h
index cdf27f2..9c52681 100644
--- a/engine/include/gf_input.h
+++ b/engine/include/gf_input.h
@@ -14,7 +14,23 @@
 #include <gf_type/input.h>
 
 /* Engine */
+#include <gf_type/core.h>
 
 /* Standard */
 
+/**
+ * @~english
+ * @brief Create input interface
+ * @param engine Engine instance
+ * @return Input interface
+ */
+GF_EXPORT gf_input_t* gf_input_create(gf_engine_t* engine);
+
+/**
+ * @~english
+ * @brief Destroy input interface
+ * @param input Input interface
+ */
+GF_EXPORT void gf_input_destroy(gf_input_t* input);
+
 #endif
diff --git a/engine/include/gf_type/client.h b/engine/include/gf_type/client.h
index 43beceb..17b34ef 100644
--- a/engine/include/gf_type/client.h
+++ b/engine/include/gf_type/client.h
@@ -11,11 +11,14 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_CLIENT
+typedef struct gf_client_t gf_client_t;
+
 /* External library */
 
 /* Engine */
 #include <gf_type/core.h>
 #include <gf_type/draw.h>
+#include <gf_type/input.h>
 
 /* Standard */
 
@@ -29,10 +32,14 @@
  *
  * @var gf_client_t::draw
  * @brief Drawing interface
+ *
+ * @var gf_client_t::input
+ * @brief Input interface
  */
 GF_DECLARE_TYPE(client, {
 	gf_engine_t* engine;
 	gf_draw_t*   draw;
+	gf_input_t*  input;
 });
 #else
 typedef void gf_client_t;
diff --git a/engine/include/gf_type/core.h b/engine/include/gf_type/core.h
index bd2171d..2d7d918 100644
--- a/engine/include/gf_type/core.h
+++ b/engine/include/gf_type/core.h
@@ -11,6 +11,8 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_CORE
+typedef struct gf_engine_t gf_engine_t;
+
 /* External library */
 
 /* Engine */
diff --git a/engine/include/gf_type/draw.h b/engine/include/gf_type/draw.h
index 4326c3d..8d4999a 100644
--- a/engine/include/gf_type/draw.h
+++ b/engine/include/gf_type/draw.h
@@ -11,6 +11,8 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_DRAW
+typedef struct gf_draw_t gf_draw_t;
+
 /* External library */
 
 /* Engine */
@@ -21,6 +23,7 @@
 #include <gf_type/math.h>
 #include <gf_type/gui.h>
 #include <gf_type/font.h>
+#include <gf_type/input.h>
 
 /* Standard */
 
@@ -32,6 +35,9 @@
  * @var gf_draw_t::engine
  * @brief Engine instance
  *
+ * @var gf_draw_t::input
+ * @brief Input interface
+ *
  * @var gf_draw_t::platform
  * @brief Platform-dependent part of drawing driver
  *
@@ -83,6 +89,7 @@
  */
 GF_DECLARE_TYPE(draw, {
 	gf_engine_t*	    engine;
+	gf_input_t*	    input;
 	gf_draw_platform_t* platform;
 	gf_draw_driver_t*   driver;
 	gf_gui_t*	    gui;
diff --git a/engine/include/gf_type/draw_driver.h b/engine/include/gf_type/draw_driver.h
index 4c75c34..fd55909 100644
--- a/engine/include/gf_type/draw_driver.h
+++ b/engine/include/gf_type/draw_driver.h
@@ -11,6 +11,8 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_DRAW_DRIVER
+typedef struct gf_draw_driver_t gf_draw_driver_t;
+
 /* External library */
 #if defined(DRV_OPENGL)
 #include <gf_opengl.h>
diff --git a/engine/include/gf_type/draw_platform.h b/engine/include/gf_type/draw_platform.h
index a55dd6f..6336d4d 100644
--- a/engine/include/gf_type/draw_platform.h
+++ b/engine/include/gf_type/draw_platform.h
@@ -11,6 +11,8 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_DRAW_PLATFORM
+typedef struct gf_draw_platform_t gf_draw_platform_t;
+
 /* External library */
 #if defined(DRV_OPENGL)
 #include <gf_opengl.h>
diff --git a/engine/include/gf_type/font.h b/engine/include/gf_type/font.h
index 0d160c1..e3f2557 100644
--- a/engine/include/gf_type/font.h
+++ b/engine/include/gf_type/font.h
@@ -11,6 +11,10 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_FONT
+typedef struct gf_font_bbox_t  gf_font_bbox_t;
+typedef struct gf_font_glyph_t gf_font_glyph_t;
+typedef struct gf_font_t       gf_font_t;
+
 /* External library */
 
 /* Engine */
diff --git a/engine/include/gf_type/graphic.h b/engine/include/gf_type/graphic.h
index 08587fd..cd732f6 100644
--- a/engine/include/gf_type/graphic.h
+++ b/engine/include/gf_type/graphic.h
@@ -11,6 +11,8 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_GRAPHIC
+typedef struct gf_graphic_color_t gf_graphic_color_t;
+
 /* External library */
 
 /* Engine */
diff --git a/engine/include/gf_type/gui.h b/engine/include/gf_type/gui.h
index 2d381d5..93cb1b8 100644
--- a/engine/include/gf_type/gui.h
+++ b/engine/include/gf_type/gui.h
@@ -17,6 +17,12 @@
 typedef int gf_gui_id_t;
 
 #ifdef GF_EXPOSE_GUI
+typedef struct gf_gui_button_t gf_gui_button_t;
+
+typedef struct gf_gui_t		  gf_gui_t;
+typedef struct gf_gui_component_t gf_gui_component_t;
+typedef union gf_gui_union_t	  gf_gui_union_t;
+
 /* External library */
 
 /* Engine */
diff --git a/engine/include/gf_type/input.h b/engine/include/gf_type/input.h
index cc0135e..30805ee 100644
--- a/engine/include/gf_type/input.h
+++ b/engine/include/gf_type/input.h
@@ -11,6 +11,8 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_INPUT
+typedef struct gf_input_t gf_input_t;
+
 /* External library */
 
 /* Engine */
@@ -18,7 +20,28 @@
 #include <gf_type/core.h>
 
 /* Standard */
+
+/**
+ * @struct gf_input_t
+ * @~english
+ * @brief Input interface
+ *
+ * @var gf_input_t::engine
+ * @brief Engine instance
+ *
+ * @var gf_input_t::mouse_x
+ * @brief X coord of mouse
+ *
+ * @var gf_input_t::mouse_y
+ * @brief Y coord of mouse
+ */
+GF_DECLARE_TYPE(input, {
+	gf_engine_t* engine;
+	int	     mouse_x;
+	int	     mouse_y;
+});
 #else
+typedef void gf_input_t;
 #endif
 
 #endif
diff --git a/engine/include/gf_type/mesh.h b/engine/include/gf_type/mesh.h
index 843d073..95c4962 100644
--- a/engine/include/gf_type/mesh.h
+++ b/engine/include/gf_type/mesh.h
@@ -11,6 +11,9 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_MESH
+typedef struct gf_mesh_triangle_t gf_mesh_triangle_t;
+typedef struct gf_mesh_t	  gf_mesh_t;
+
 /* External library */
 
 /* Engine */
@@ -20,17 +23,17 @@
 /* Standard */
 
 /**
- * @struct gf_triangle_t
+ * @struct gf_mesh_triangle_t
  * @~english
  * @brief Triangle
  *
- * @var gf_triangle_t::points
+ * @var gf_mesh_triangle_t::points
  * @brief Triangle points
  *
- * @var gf_triangle_t::color
+ * @var gf_mesh_triangle_t::color
  * @brief Triangle color
  */
-GF_DECLARE_TYPE(triangle, {
+GF_DECLARE_TYPE(mesh_triangle, {
 	gf_math_vector_t   points[3];
 	gf_graphic_color_t color;
 });
@@ -47,12 +50,12 @@ GF_DECLARE_TYPE(triangle, {
  * @brief Triangle count
  */
 GF_DECLARE_TYPE(mesh, {
-	gf_triangle_t* triangles;
-	int	       triangle_count;
+	gf_mesh_triangle_t* triangles;
+	int		    triangle_count;
 });
 #else
 typedef void gf_mesh_t;
-typedef void gf_triangle_t;
+typedef void gf_mesh_triangle_t;
 #endif
 
 #endif
diff --git a/engine/include/gf_type/model.h b/engine/include/gf_type/model.h
index 91517df..e518668 100644
--- a/engine/include/gf_type/model.h
+++ b/engine/include/gf_type/model.h
@@ -11,6 +11,8 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_MODEL
+typedef struct gf_model_t gf_model_t;
+
 /* External library */
 
 /* Engine */
diff --git a/engine/include/gf_type/physics.h b/engine/include/gf_type/physics.h
index 59d1310..9e5be81 100644
--- a/engine/include/gf_type/physics.h
+++ b/engine/include/gf_type/physics.h
@@ -11,6 +11,8 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_PHYSICS
+typedef struct gf_physics_t gf_physics_t;
+
 /* External library */
 #include <ode/ode.h>
 
diff --git a/engine/include/gf_type/server.h b/engine/include/gf_type/server.h
index 96bcbe8..ed19fe1 100644
--- a/engine/include/gf_type/server.h
+++ b/engine/include/gf_type/server.h
@@ -11,6 +11,8 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_SERVER
+typedef struct gf_server_t gf_server_t;
+
 /* External library */
 
 /* Engine */
diff --git a/engine/include/gf_type/texture.h b/engine/include/gf_type/texture.h
index a34bd74..9c5b53b 100644
--- a/engine/include/gf_type/texture.h
+++ b/engine/include/gf_type/texture.h
@@ -11,6 +11,8 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_TEXTURE
+typedef struct gf_texture_t gf_texture_t;
+
 /* External library */
 
 /* Engine */
diff --git a/engine/include/gf_type/thread.h b/engine/include/gf_type/thread.h
index 44da0e1..8dfc5d7 100644
--- a/engine/include/gf_type/thread.h
+++ b/engine/include/gf_type/thread.h
@@ -11,6 +11,9 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_THREAD
+typedef struct gf_thread_context_t gf_thread_context_t;
+typedef struct gf_thread_t	   gf_thread_t;
+
 /* External library */
 #if defined(THREAD_POSIX)
 #include <pthread.h>
diff --git a/engine/include/gf_type/version.h b/engine/include/gf_type/version.h
index cd1c7c4..3513b1a 100644
--- a/engine/include/gf_type/version.h
+++ b/engine/include/gf_type/version.h
@@ -11,6 +11,8 @@
 #include <gf_macro.h>
 
 #ifdef GF_EXPOSE_VERSION
+typedef struct gf_version_t gf_version_t;
+
 /* External library */
 
 /* Engine */