win-capture: Wait a few frames for hook to load

Now that the game capture hook creates and controls all the
synchronization objects, it's no longer possible to expect that the hook
is fully loaded by the time game capture tries to initialize it.  In
that case, allow game capture to retry the hook for a few frames before
assuming something failed.

plugins/win-capture/game-capture.c

@@ -148,6 +148,7 @@ struct game_capture {
 	HANDLE                        target_process;
 	HANDLE                        texture_mutexes[2];
 	wchar_t                       *app_sid;
+	int                           retrying;
 
 	union {
 		struct {
@@ -316,6 +317,9 @@ static void stop_capture(struct game_capture *gc)
 	gc->wait_for_target_startup = false;
 	gc->active = false;
 	gc->capturing = false;
+
+	if (gc->retrying)
+		gc->retrying--;
 }
 
 static inline void free_config(struct game_capture_config *config)
@@ -718,7 +722,16 @@ static inline bool init_texture_mutexes(struct game_capture *gc)
 	gc->texture_mutexes[1] = open_mutex_gc(gc, MUTEX_TEXTURE2);
 
 	if (!gc->texture_mutexes[0] || !gc->texture_mutexes[1]) {
-		warn("failed to open texture mutexes: %lu", GetLastError());
+		DWORD error = GetLastError();
+		if (error == 2) {
+			if (!gc->retrying) {
+				gc->retrying = 2;
+				info("hook not loaded yet, retrying..");
+			}
+		} else {
+			warn("failed to open texture mutexes: %lu",
+					GetLastError());
+		}
 		return false;
 	}
 
@@ -1047,6 +1060,7 @@ static bool init_hook(struct game_capture *gc)
 	gc->window = gc->next_window;
 	gc->next_window = NULL;
 	gc->active = true;
+	gc->retrying = 0;
 	return true;
 }