win-capture: Defer hook offset loading to separate thread

Boosts startup time significantly to defer this to a separate thread.

plugins/win-capture/game-capture.c

@@ -452,9 +452,14 @@ static void game_capture_update(void *data, obs_data_t *settings)
 	}
 }
 
+extern void wait_for_hook_initialization(void);
+
 static void *game_capture_create(obs_data_t *settings, obs_source_t *source)
 {
 	struct game_capture *gc = bzalloc(sizeof(*gc));
+
+	wait_for_hook_initialization();
+
 	gc->source = source;
 	gc->initial_config = true;
 	gc->retry_interval = DEFAULT_RETRY_INTERVAL;

plugins/win-capture/plugin-main.c

@@ -11,6 +11,8 @@ extern struct obs_source_info monitor_capture_info;
 extern struct obs_source_info window_capture_info;
 extern struct obs_source_info game_capture_info;
 
+static HANDLE init_hooks_thread = NULL;
+
 extern bool cached_versions_match(void);
 extern bool load_cached_graphics_offsets(bool is32bit);
 extern bool load_graphics_offsets(bool is32bit);
@@ -25,6 +27,37 @@ extern bool load_graphics_offsets(bool is32bit);
 
 #define USE_HOOK_ADDRESS_CACHE false
 
+static DWORD WINAPI init_hooks(LPVOID unused)
+{
+	if (USE_HOOK_ADDRESS_CACHE &&
+	    cached_versions_match() &&
+	    load_cached_graphics_offsets(IS32BIT)) {
+
+		load_cached_graphics_offsets(!IS32BIT);
+		obs_register_source(&game_capture_info);
+
+	} else if (load_graphics_offsets(IS32BIT)) {
+		load_graphics_offsets(!IS32BIT);
+	}
+
+	UNUSED_PARAMETER(unused);
+	return 0;
+}
+
+void wait_for_hook_initialization(void)
+{
+	static bool initialized = false;
+
+	if (!initialized) {
+		if (init_hooks_thread) {
+			WaitForSingleObject(init_hooks_thread, INFINITE);
+			CloseHandle(init_hooks_thread);
+			init_hooks_thread = NULL;
+		}
+		initialized = true;
+	}
+}
+
 bool obs_module_load(void)
 {
 	struct win_version_info ver;
@@ -52,17 +85,13 @@ bool obs_module_load(void)
 
 	obs_register_source(&window_capture_info);
 
-	if (USE_HOOK_ADDRESS_CACHE &&
-	    cached_versions_match() &&
-	    load_cached_graphics_offsets(IS32BIT)) {
-
-		load_cached_graphics_offsets(!IS32BIT);
-		obs_register_source(&game_capture_info);
-
-	} else if (load_graphics_offsets(IS32BIT)) {
-		load_graphics_offsets(!IS32BIT);
-		obs_register_source(&game_capture_info);
-	}
+	init_hooks_thread = CreateThread(NULL, 0, init_hooks, NULL, 0, NULL);
+	obs_register_source(&game_capture_info);
 
 	return true;
 }
+
+void obs_module_unload(void)
+{
+	wait_for_hook_initialization();
+}