2 files changed, 102 insertions, 0 deletions

diff --git a/sway/desktop/output.c b/sway/desktop/output.c
index 1636a58b..dccb2432 100644
--- a/sway/desktop/output.c
+++ b/sway/desktop/output.c
@@ -578,6 +578,30 @@ static void update_textures(struct sway_container *con, void *data) {
 	container_update_marks_textures(con);
 }
 
+static void update_output_manager_config(struct sway_server *server) {
+	struct wlr_output_configuration_v1 *config =
+		wlr_output_configuration_v1_create();
+
+	struct sway_output *output;
+	wl_list_for_each(output, &root->all_outputs, link) {
+		if (output == root->noop_output) {
+			continue;
+		}
+		struct wlr_output_configuration_head_v1 *config_head =
+			wlr_output_configuration_head_v1_create(config, output->wlr_output);
+		struct wlr_box *output_box = wlr_output_layout_get_box(
+			root->output_layout, output->wlr_output);
+		// We mark the output enabled even if it is switched off by DPMS
+		config_head->state.enabled = output->enabled;
+		if (output_box) {
+			config_head->state.x = output_box->x;
+			config_head->state.y = output_box->y;
+		}
+	}
+
+	wlr_output_manager_v1_set_configuration(server->output_manager_v1, config);
+}
+
 static void handle_scale(struct wl_listener *listener, void *data) {
 	struct sway_output *output = wl_container_of(listener, output, scale);
 	if (!output->enabled || !output->configured) {
@@ -651,4 +675,73 @@ void handle_new_output(struct wl_listener *listener, void *data) {
 	}
 
 	transaction_commit_dirty();
+
+	update_output_manager_config(server);
+}
+
+void handle_output_manager_apply(struct wl_listener *listener, void *data) {
+	struct sway_server *server =
+		wl_container_of(listener, server, output_manager_apply);
+	struct wlr_output_configuration_v1 *config = data;
+
+	struct wlr_output_configuration_head_v1 *config_head;
+	// First disable outputs we need to disable
+	bool ok = true;
+	wl_list_for_each(config_head, &config->heads, link) {
+		struct wlr_output *wlr_output = config_head->state.output;
+		struct sway_output *output = wlr_output->data;
+		if (!output->enabled || config_head->state.enabled) {
+			continue;
+		}
+		struct output_config *oc = new_output_config(output->wlr_output->name);
+		oc->enabled = false;
+
+		oc = store_output_config(oc);
+		ok &= apply_output_config(oc, output);
+	}
+
+	// Then enable outputs that need to
+	wl_list_for_each(config_head, &config->heads, link) {
+		struct wlr_output *wlr_output = config_head->state.output;
+		struct sway_output *output = wlr_output->data;
+		if (!config_head->state.enabled) {
+			continue;
+		}
+		struct output_config *oc = new_output_config(output->wlr_output->name);
+		oc->enabled = true;
+		if (config_head->state.mode != NULL) {
+			struct wlr_output_mode *mode = config_head->state.mode;
+			oc->width = mode->width;
+			oc->height = mode->height;
+			oc->refresh_rate = mode->refresh;
+		} else {
+			oc->width = config_head->state.custom_mode.width;
+			oc->height = config_head->state.custom_mode.height;
+			oc->refresh_rate = config_head->state.custom_mode.refresh;
+		}
+		oc->x = config_head->state.x;
+		oc->y = config_head->state.y;
+		oc->transform = config_head->state.transform;
+		oc->scale = config_head->state.scale;
+
+		oc = store_output_config(oc);
+		ok &= apply_output_config(oc, output);
+	}
+
+	if (ok) {
+		wlr_output_configuration_v1_send_succeeded(config);
+	} else {
+		wlr_output_configuration_v1_send_failed(config);
+	}
+	wlr_output_configuration_v1_destroy(config);
+
+	update_output_manager_config(server);
+}
+
+void handle_output_manager_test(struct wl_listener *listener, void *data) {
+	struct wlr_output_configuration_v1 *config = data;
+
+	// TODO: implement test-only mode
+	wlr_output_configuration_v1_send_succeeded(config);
+	wlr_output_configuration_v1_destroy(config);
 }
diff --git a/sway/server.c b/sway/server.c
index b24cc1dc..e5200d59 100644
--- a/sway/server.c
+++ b/sway/server.c
@@ -120,6 +120,15 @@ bool server_init(struct sway_server *server) {
 	server->presentation =
 		wlr_presentation_create(server->wl_display, server->backend);
 
+	server->output_manager_v1 =
+		wlr_output_manager_v1_create(server->wl_display);
+	server->output_manager_apply.notify = handle_output_manager_apply;
+	wl_signal_add(&server->output_manager_v1->events.apply,
+		&server->output_manager_apply);
+	server->output_manager_test.notify = handle_output_manager_test;
+	wl_signal_add(&server->output_manager_v1->events.test,
+		&server->output_manager_test);
+
 	wlr_export_dmabuf_manager_v1_create(server->wl_display);
 	wlr_screencopy_manager_v1_create(server->wl_display);
 	wlr_data_control_manager_v1_create(server->wl_display);