compositor: Move input devices to their own event loop

First step towards only handling input at repaint time.

src/compositor.c

@@ -2268,6 +2268,16 @@ compositor_bind(struct wl_client *client,
 			     &compositor_interface, id, compositor);
 }
 
+static int
+weston_compositor_read_input(int fd, uint32_t mask, void *data)
+{
+	struct weston_compositor *compositor = data;
+
+	wl_event_loop_dispatch(compositor->input_loop, 0);
+
+	return 1;
+}
+
 WL_EXPORT int
 weston_compositor_init(struct weston_compositor *ec, struct wl_display *display)
 {
@@ -2337,6 +2347,15 @@ weston_compositor_init(struct weston_compositor *ec, struct wl_display *display)
 	ec->idle_source = wl_event_loop_add_timer(loop, idle_handler, ec);
 	wl_event_source_timer_update(ec->idle_source, ec->idle_time * 1000);
 
+	ec->input_loop = wl_event_loop_create();
+
+	ec->input_loop_source =
+		wl_event_loop_add_fd(loop,
+				     wl_event_loop_get_fd(ec->input_loop),
+				     WL_EVENT_READABLE,
+				     weston_compositor_read_input, ec);
+
+
 	weston_compositor_schedule_repaint(ec);
 
 	return 0;

src/compositor.h

@@ -184,6 +184,9 @@ struct weston_compositor {
 
 	struct weston_shell *shell;
 
+	struct wl_event_loop *input_loop;
+	struct wl_event_source *input_loop_source;
+
 	/* There can be more than one, but not right now... */
 	struct wl_input_device *input_device;
 

src/evdev.c

@@ -437,7 +437,6 @@ evdev_input_device_create(struct evdev_input *master,
 			  struct wl_display *display, const char *path)
 {
 	struct evdev_input_device *device;
-	struct wl_event_loop *loop;
 	struct weston_compositor *ec;
 
 	device = malloc(sizeof *device);
@@ -463,8 +462,7 @@ evdev_input_device_create(struct evdev_input *master,
 	if (evdev_configure_device(device) == -1)
 		goto err1;
 
-	loop = wl_display_get_event_loop(display);
-	device->source = wl_event_loop_add_fd(loop, device->fd,
+	device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 					      WL_EVENT_READABLE,
 					      evdev_input_device_data, device);
 	if (device->source == NULL)