backend: don't create renderer if none is available

backend/backend.c

@@ -47,9 +47,6 @@ void wlr_backend_init(struct wlr_backend *backend,
 void wlr_backend_finish(struct wlr_backend *backend) {
 	wlr_signal_emit_safe(&backend->events.destroy, backend);
 	wlr_allocator_destroy(backend->allocator);
-	if (backend->has_own_renderer) {
-		wlr_renderer_destroy(backend->renderer);
-	}
 }
 
 bool wlr_backend_start(struct wlr_backend *backend) {
@@ -71,33 +68,10 @@ void wlr_backend_destroy(struct wlr_backend *backend) {
 	}
 }
 
-static bool backend_create_renderer(struct wlr_backend *backend) {
-	if (backend->renderer != NULL) {
-		return true;
-	}
-
-	backend->renderer = wlr_renderer_autocreate(backend);
-	if (backend->renderer == NULL) {
-		return false;
-	}
-
-	backend->has_own_renderer = true;
-	return true;
-}
-
 struct wlr_renderer *wlr_backend_get_renderer(struct wlr_backend *backend) {
 	if (backend->impl->get_renderer) {
 		return backend->impl->get_renderer(backend);
 	}
-	if (backend_get_buffer_caps(backend) != 0) {
-		// If the backend is capable of presenting buffers, automatically create
-		// the renderer if necessary.
-		if (!backend_create_renderer(backend)) {
-			wlr_log(WLR_ERROR, "Failed to create backend renderer");
-			return NULL;
-		}
-		return backend->renderer;
-	}
 	return NULL;
 }
 

include/wlr/backend.h

@@ -28,8 +28,6 @@ struct wlr_backend {
 
 	// Private state
 
-	bool has_own_renderer;
-	struct wlr_renderer *renderer;
 	struct wlr_allocator *allocator;
 };