5 files changed, 50 insertions, 14 deletions
diff --git a/include/backend.h b/include/backend.h
new file mode 100644
index 00000000..d42c6f17
--- /dev/null
+++ b/include/backend.h
@@ -0,0 +1,17 @@
+#ifndef _WLR_BACKEND_INTERNAL_H
+#define _WLR_BACKEND_INTERNAL_H
+
+#include <stdbool.h>
+#include <wlr/backend.h>
+
+struct wlr_backend_state;
+
+struct wlr_backend_impl {
+	bool (*init)(struct wlr_backend_state *state);
+	void (*destroy)(struct wlr_backend_state *state);
+};
+
+struct wlr_backend *wlr_backend_create(const struct wlr_backend_impl *impl,
+		struct wlr_backend_state *state);
+
+#endif
diff --git a/include/backend/drm/backend.h b/include/backend/drm/backend.h
index bdda7ea7..0c725ccb 100644
--- a/include/backend/drm/backend.h
+++ b/include/backend/drm/backend.h
@@ -12,21 +12,17 @@
 #include <wlr/common/list.h>
 #include <wlr/backend/drm.h>
 
+#include "backend.h"
 #include "udev.h"
 #include "event.h"
 #include "drm.h"
 
-struct wlr_drm_backend {
+struct wlr_backend_state {
 	int fd;
 
+	struct wlr_backend *backend;
 	struct wl_event_source *drm_event;
 
-	struct {
-		struct wl_signal output_add;
-		struct wl_signal output_rem;
-		struct wl_signal output_render;
-	} signals;
-
 	uint32_t taken_crtcs;
 	list_t *outputs;
 
diff --git a/include/backend/drm/drm.h b/include/backend/drm/drm.h
index 51b0cdc6..3e83058a 100644
--- a/include/backend/drm/drm.h
+++ b/include/backend/drm/drm.h
@@ -8,6 +8,7 @@
 #include <gbm.h>
 
 #include "backend/egl.h"
+#include "backend.h"
 
 struct wlr_drm_renderer {
 	int fd;
@@ -50,7 +51,7 @@ struct wlr_drm_output {
 
 void wlr_drm_output_cleanup(struct wlr_drm_output *out, bool restore);
 
-void wlr_drm_scan_connectors(struct wlr_drm_backend *backend);
+void wlr_drm_scan_connectors(struct wlr_backend_state *state);
 int wlr_drm_event(int fd, uint32_t mask, void *data);
 
 #endif
diff --git a/include/wlr/backend.h b/include/wlr/backend.h
index 527efa05..88a5c8e9 100644
--- a/include/wlr/backend.h
+++ b/include/wlr/backend.h
@@ -1,7 +1,30 @@
 #ifndef _WLR_BACKEND_H
 #define _WLR_BACKEND_H
 
-struct wlr_backend *wlr_backend_init();
-void wlr_backend_free(struct wlr_backend *backend);
+#include <wayland-server.h>
+
+struct wlr_backend_impl;
+struct wlr_backend_state;
+
+struct wlr_backend {
+	const struct wlr_backend_impl *impl;
+	struct wlr_backend_state *state;
+
+	struct {
+		struct wl_signal output_add;
+		struct wl_signal output_remove;
+		struct wl_signal output_frame;
+		struct wl_signal keyboard_add;
+		struct wl_signal keyboard_remove;
+		struct wl_signal pointer_add;
+		struct wl_signal pointer_remove;
+		struct wl_signal touch_add;
+		struct wl_signal touch_remove;
+	} events;
+};
+
+struct wlr_backend *wlr_backend_autocreate();
+bool wlr_backend_init(struct wlr_backend *backend);
+void wlr_backend_destroy(struct wlr_backend *backend);
 
 #endif
diff --git a/include/wlr/backend/drm.h b/include/wlr/backend/drm.h
index 4131b4cb..5db9b35c 100644
--- a/include/wlr/backend/drm.h
+++ b/include/wlr/backend/drm.h
@@ -3,6 +3,7 @@
 
 #include <wayland-server.h>
 #include <wlr/session.h>
+#include <wlr/backend.h>
 #include <xf86drmMode.h> // drmModeModeInfo
 
 struct wlr_drm_backend;
@@ -15,10 +16,8 @@ struct wlr_drm_mode {
 	drmModeModeInfo mode;
 };
 
-struct wlr_drm_backend *wlr_drm_backend_init(struct wl_display *display,
-	struct wlr_session *session, struct wl_listener *add, struct wl_listener *rem,
-	struct wl_listener *render);
-void wlr_drm_backend_free(struct wlr_drm_backend *backend);
+struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
+	struct wlr_session *session);
 
 const char *wlr_drm_output_get_name(struct wlr_drm_output *out);