Add an adaptive_sync output command

This enables/disables adaptive synchronization on the output.

For now, the default is disabled because it might cause flickering on
some hardware if clients don't submit frames at regular enough
intervals. In the future an "auto" option will only enable adaptive sync
if a fullscreen client opts-in via a Wayland protocol.

1 files changed, 22 insertions, 0 deletions

diff --git a/sway/commands/output/adaptive_sync.c b/sway/commands/output/adaptive_sync.c
new file mode 100644
index 00000000..7382e2ee
--- /dev/null
+++ b/sway/commands/output/adaptive_sync.c
@@ -0,0 +1,22 @@
+#include "sway/commands.h"
+#include "sway/config.h"
+#include "util.h"
+
+struct cmd_results *output_cmd_adaptive_sync(int argc, char **argv) {
+	if (!config->handler_context.output_config) {
+		return cmd_results_new(CMD_FAILURE, "Missing output config");
+	}
+	if (argc == 0) {
+		return cmd_results_new(CMD_INVALID, "Missing adaptive_sync argument");
+	}
+
+	if (parse_boolean(argv[0], true)) {
+		config->handler_context.output_config->adaptive_sync = 1;
+	} else {
+		config->handler_context.output_config->adaptive_sync = 0;
+	}
+
+	config->handler_context.leftovers.argc = argc - 1;
+	config->handler_context.leftovers.argv = argv + 1;
+	return NULL;
+}