1 files changed, 103 insertions, 0 deletions
diff --git a/backend/drm/backend.c b/backend/drm/backend.c
new file mode 100644
index 00000000..0da84745
--- /dev/null
+++ b/backend/drm/backend.c
@@ -0,0 +1,103 @@
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <wayland-server.h>
+
+#include <wlr/session.h>
+#include <wlr/common/list.h>
+
+#include "backend.h"
+#include "backend/drm/backend.h"
+#include "backend/drm/drm.h"
+#include "backend/drm/udev.h"
+#include "common/log.h"
+
+static bool wlr_drm_backend_init(struct wlr_backend_state *state) {
+	wlr_drm_scan_connectors(state);
+	return true;
+}
+
+static void wlr_drm_backend_destroy(struct wlr_backend_state *state) {
+	if (!state) {
+		return;
+	}
+	// TODO: free outputs in shared backend code
+	wlr_drm_renderer_free(&state->renderer);
+	wlr_udev_free(&state->udev);
+	wlr_session_close_file(state->session, state->fd);
+	wlr_session_finish(state->session);
+	wl_event_source_remove(state->drm_event);
+	free(state);
+}
+
+static struct wlr_backend_impl backend_impl = {
+	.init = wlr_drm_backend_init,
+	.destroy = wlr_drm_backend_destroy
+};
+
+struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
+		struct wlr_session *session) {
+	struct wlr_backend_state *state = calloc(1, sizeof(struct wlr_backend_state));
+	if (!state) {
+		wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
+		return NULL;
+	}
+
+	struct wlr_backend *backend = wlr_backend_create(&backend_impl, state);
+	if (!backend) {
+		wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
+		return NULL;
+	}
+
+	state->backend = backend;
+	state->session = session;
+	state->outputs = list_create();
+	if (!state->outputs) {
+		wlr_log(L_ERROR, "Failed to allocate list");
+		goto error_backend;
+	}
+
+	if (!wlr_udev_init(display, &state->udev)) {
+		wlr_log(L_ERROR, "Failed to start udev");
+		goto error_list;
+	}
+
+	state->fd = wlr_udev_find_gpu(&state->udev, state->session);
+	if (state->fd == -1) {
+		wlr_log(L_ERROR, "Failed to open DRM device");
+		goto error_udev;
+	}
+
+	struct wl_event_loop *event_loop = wl_display_get_event_loop(display);
+
+	state->drm_event = wl_event_loop_add_fd(event_loop, state->fd,
+		WL_EVENT_READABLE, wlr_drm_event, NULL);
+	if (!state->drm_event) {
+		wlr_log(L_ERROR, "Failed to create DRM event source");
+		goto error_fd;
+	}
+
+	// TODO: what is the difference between the per-output renderer and this
+	// one?
+	if (!wlr_drm_renderer_init(&state->renderer, state->fd)) {
+		wlr_log(L_ERROR, "Failed to initialize renderer");
+		goto error_event;
+	}
+
+	return backend;
+
+error_event:
+	wl_event_source_remove(state->drm_event);
+error_fd:
+	wlr_session_close_file(state->session, state->fd);
+error_udev:
+	wlr_udev_free(&state->udev);
+error_list:
+	list_free(state->outputs);
+error_backend:
+	free(state);
+	free(backend);
+	return NULL;
+}