Add user data to wlr_* structs

Resolves #68

include/wlr/types/wlr_input_device.h

@@ -41,6 +41,8 @@ struct wlr_input_device {
 		struct wlr_tablet_tool *tablet_tool;
 		struct wlr_tablet_pad *tablet_pad;
 	};
+
+	void *data;
 };
 
 #endif

include/wlr/types/wlr_keyboard.h

@@ -20,6 +20,8 @@ struct wlr_keyboard {
 	struct {
 		struct wl_signal key;
 	} events;
+
+	void *data;
 };
 
 void wlr_keyboard_led_update(struct wlr_keyboard *keyboard, uint32_t leds);

include/wlr/types/wlr_output.h

@@ -51,6 +51,8 @@ struct wlr_output {
 		struct wlr_renderer *renderer;
 		struct wlr_texture *texture;
 	} cursor;
+
+	void *data;
 };
 
 void wlr_output_enable(struct wlr_output *output, bool enable);

include/wlr/types/wlr_pointer.h

@@ -17,6 +17,8 @@ struct wlr_pointer {
 		struct wl_signal button;
 		struct wl_signal axis;
 	} events;
+
+	void *data;
 };
 
 struct wlr_event_pointer_motion {

include/wlr/types/wlr_surface.h

@@ -45,6 +45,8 @@ struct wlr_surface {
 
 	struct wl_listener compositor_listener; // destroy listener used by compositor
 	void *compositor_data;
+
+	void *data;
 };
 
 struct wlr_renderer;

include/wlr/types/wlr_tablet_pad.h

@@ -22,6 +22,8 @@ struct wlr_tablet_pad {
 		struct wl_signal ring;
 		struct wl_signal strip;
 	} events;
+
+	void *data;
 };
 
 struct wlr_event_tablet_pad_button {

include/wlr/types/wlr_tablet_tool.h

@@ -17,6 +17,8 @@ struct wlr_tablet_tool {
 		struct wl_signal tip;
 		struct wl_signal button;
 	} events;
+
+	void *data;
 };
 
 enum wlr_tablet_tool_axes {

include/wlr/types/wlr_touch.h

@@ -16,6 +16,8 @@ struct wlr_touch {
 		struct wl_signal motion;
 		struct wl_signal cancel;
 	} events;
+
+	void *data;
 };
 
 struct wlr_event_touch_down {

include/wlr/types/wlr_xdg_shell_v6.h

@@ -6,12 +6,16 @@ struct wlr_xdg_shell_v6 {
 	struct wl_global *wl_global;
 	struct wl_list wl_resources;
 	struct wl_list surfaces;
+
+	void *data;
 };
 
 struct wlr_xdg_surface_v6 {
 	struct wl_resource *resource;
 	struct wl_resource *surface;
 	struct wl_list link;
+
+	void *data;
 };
 
 struct wlr_xdg_shell_v6 *wlr_xdg_shell_v6_init(struct wl_display *display);