linux-dmabuf-v1: use resource interface

Instead of hardcoding builtin resource types in
wlr_buffer_from_resource(), use the modular resource interface.

types/buffer/resource.c

@@ -3,7 +3,6 @@
 #include <wayland-server.h>
 #include <wlr/interfaces/wlr_buffer.h>
 #include <wlr/types/wlr_drm.h>
-#include <wlr/types/wlr_linux_dmabuf_v1.h>
 #include <wlr/util/log.h>
 #include "types/wlr_buffer.h"
 
@@ -49,11 +48,7 @@ struct wlr_buffer *wlr_buffer_from_resource(struct wl_resource *resource) {
 	assert(resource && wlr_resource_is_buffer(resource));
 
 	struct wlr_buffer *buffer;
-	if (wlr_dmabuf_v1_resource_is_buffer(resource)) {
-		struct wlr_dmabuf_v1_buffer *dmabuf =
-			wlr_dmabuf_v1_buffer_from_buffer_resource(resource);
-		buffer = wlr_buffer_lock(&dmabuf->base);
-	} else if (wlr_drm_buffer_is_resource(resource)) {
+	if (wlr_drm_buffer_is_resource(resource)) {
 		struct wlr_drm_buffer *drm_buffer =
 			wlr_drm_buffer_from_resource(resource);
 		buffer = wlr_buffer_lock(&drm_buffer->base);

types/wlr_linux_dmabuf_v1.c

@@ -885,6 +885,18 @@ static void linux_dmabuf_bind(struct wl_client *client, void *data,
 	}
 }
 
+static struct wlr_buffer *buffer_from_resource(struct wl_resource *resource) {
+	struct wlr_dmabuf_v1_buffer *buffer =
+		wlr_dmabuf_v1_buffer_from_buffer_resource(resource);
+	return &buffer->base;
+}
+
+static const struct wlr_buffer_resource_interface buffer_resource_interface = {
+	.name = "wlr_dmabuf_v1_buffer",
+	.is_instance = wlr_dmabuf_v1_resource_is_buffer,
+	.from_resource = buffer_from_resource,
+};
+
 static void linux_dmabuf_v1_destroy(struct wlr_linux_dmabuf_v1 *linux_dmabuf) {
 	wl_signal_emit_mutable(&linux_dmabuf->events.destroy, linux_dmabuf);
 
@@ -950,6 +962,8 @@ struct wlr_linux_dmabuf_v1 *wlr_linux_dmabuf_v1_create(struct wl_display *displa
 	linux_dmabuf->renderer_destroy.notify = handle_renderer_destroy;
 	wl_signal_add(&renderer->events.destroy, &linux_dmabuf->renderer_destroy);
 
+	wlr_buffer_register_resource_interface(&buffer_resource_interface);
+
 	return linux_dmabuf;
 }