Method _load_start

core/io/resource_loader.cpp:575–673

}

Ref<ResourceLoader::LoadToken> ResourceLoader::_load_start(const String &p_path, const String &p_type_hint, LoadThreadMode p_thread_mode, ResourceFormatLoader::CacheMode p_cache_mode, bool p_for_user) {
	String local_path = _validate_local_path(p_path);
	ERR_FAIL_COND_V(local_path.is_empty(), Ref<ResourceLoader::LoadToken>());

	bool ignoring_cache = p_cache_mode == ResourceFormatLoader::CACHE_MODE_IGNORE || p_cache_mode == ResourceFormatLoader::CACHE_MODE_IGNORE_DEEP;

	Ref<LoadToken> load_token;
	bool must_not_register = false;
	ThreadLoadTask *load_task_ptr = nullptr;
	{
		MutexLock thread_load_lock(thread_load_mutex);

		if (p_for_user) {
			LoadToken *existing_token = _load_threaded_request_reuse_user_token(p_path);
			if (existing_token) {
				return Ref<LoadToken>(existing_token);
			}
		}

		if (!ignoring_cache && thread_load_tasks.has(local_path)) {
			load_token = Ref<LoadToken>(thread_load_tasks[local_path].load_token);
			if (load_token.is_valid()) {
				if (p_for_user) {
					// Load task exists, with no user tokens at the moment.
					// Let's "attach" to it.
					_load_threaded_request_setup_user_token(load_token.ptr(), p_path);
				}
				return load_token;
			} else {
				// The token is dying (reached 0 on another thread).
				// Ensure it's killed now so the path can be safely reused right away.
				thread_load_tasks[local_path].load_token->clear();
			}
		}

		load_token.instantiate();
		load_token->local_path = local_path;
		if (p_for_user) {
			_load_threaded_request_setup_user_token(load_token.ptr(), p_path);
		}

		//create load task
		{
			ThreadLoadTask load_task;

			load_task.load_token = load_token.ptr();
			load_task.local_path = local_path;
			load_task.type_hint = p_type_hint;
			load_task.cache_mode = p_cache_mode;
			load_task.use_sub_threads = p_thread_mode == LOAD_THREAD_DISTRIBUTE;
			if (p_cache_mode == ResourceFormatLoader::CACHE_MODE_REUSE) {
				Ref<Resource> existing = ResourceCache::get_ref(local_path);
				if (existing.is_valid()) {
					//referencing is fine
					load_task.resource = existing;
					load_task.status = THREAD_LOAD_LOADED;
					load_task.progress = 1.0;
					DEV_ASSERT(!thread_load_tasks.has(local_path));