[client] transport: track video component availability

client/tests/sw_surface_test.c

@@ -0,0 +1,84 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2026 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include "sw_surface.h"
+#include "test.h"
+
+#include <stdatomic.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+struct LG_Transport
+{
+  atomic_bool entered;
+  atomic_bool armed;
+  atomic_bool release;
+  atomic_uint cancelCount;
+  atomic_uint on;
+  atomic_uint off;
+};
+
+static bool setActive(LG_Transport * transport, bool active)
+{
+  atomic_fetch_add(active ? &transport->on : &transport->off, 1);
+  atomic_store(&transport->entered, true);
+  if (active)
+  {
+    /* Lose the first cancellation edge before arming the wait. */
+    while (!atomic_load(&transport->cancelCount))
+      usleep(1000);
+    atomic_store(&transport->release, false);
+    atomic_store(&transport->armed, true);
+    while (!atomic_load(&transport->release))
+      usleep(1000);
+  }
+  return !active || atomic_load(&transport->release);
+}
+
+static void cancelPending(LG_Transport * transport)
+{
+  atomic_fetch_add(&transport->cancelCount, 1);
+  if (atomic_load(&transport->armed))
+    atomic_store(&transport->release, true);
+}
+
+static bool cancelled(void * opaque)
+{
+  return *(const bool *)opaque;
+}
+
+static const LG_SwSurfaceOps ops =
+{
+  .setActive    = setActive,
+  .cancelPending = cancelPending,
+};
+
+int main(void)
+{
+  LG_Transport transport = { 0 };
+  const bool stop = true;
+  CHECK(!lgSwSurface_setActive(
+        &ops, &transport, true, cancelled, (void *)&stop));
+  CHECK(atomic_load(&transport.entered));
+  CHECK(atomic_load(&transport.cancelCount) >= 2);
+  CHECK(atomic_load(&transport.on) == 1);
+  CHECK(atomic_load(&transport.off) == 1);
+
+  atomic_store(&transport.entered, false);
+  atomic_store(&transport.release, false);
+  atomic_store(&transport.cancelCount, 0);
+  CHECK(lgSwSurface_setActive(
+        &ops, &transport, false, cancelled, (void *)&stop));
+  CHECK(atomic_load(&transport.entered));
+  CHECK(atomic_load(&transport.cancelCount) == 0);
+  CHECK(atomic_load(&transport.off) == 2);
+  return EXIT_SUCCESS;
+}