Function PreloadPathDescriptor

engine/resource/src/resource_preloader.cpp:324–370

    }

    static Result PreloadPathDescriptor(HPreloader preloader, TRequestIndex parent, const PathDescriptor& path_descriptor)
    {
        // Quick deduplication, check if the child is already listed under the current parent
        TRequestIndex child = preloader->m_Request[parent].m_FirstChild;
        while (child != -1)
        {
            if (preloader->m_Request[child].m_PathDescriptor.m_NameHash == path_descriptor.m_NameHash)
            {
                return RESULT_ALREADY_REGISTERED;
            }
            child = preloader->m_Request[child].m_NextSibling;
        }

        if (!preloader->m_FreelistSize)
        {
            // Preload queue is exhausted; this is not fatal, it just means the resource will be loaded
            // inside the main thread which may cause stuttering
            return RESULT_OUT_OF_MEMORY;
        }

        TRequestIndex new_req = preloader->m_Freelist[--preloader->m_FreelistSize];
        PreloadRequest* req   = &preloader->m_Request[new_req];
        memset(req, 0, sizeof(PreloadRequest));
        req->m_PathDescriptor    = path_descriptor;
        req->m_FirstChild        = -1;
        req->m_LoadResult        = RESULT_PENDING;

        PreloaderTreeInsert(preloader, new_req, parent);

        // Check for recursive resources, if it is, mark with loop error, the recursive load result will
        // be checked for in the PreloaderUpdateOneItem and the result will be propagated to the resource
        // preloaded creator.
        TRequestIndex go_up = parent;
        while (go_up != -1)
        {
            if (preloader->m_Request[go_up].m_PathDescriptor.m_CanonicalPathHash == path_descriptor.m_CanonicalPathHash)
            {
                req->m_LoadResult = RESULT_RESOURCE_LOOP_ERROR;
                assert(parent != -1);
                assert(preloader->m_Request[parent].m_PendingChildCount > 0);
                preloader->m_Request[parent].m_PendingChildCount -= 1;
                break;
            }
            go_up = preloader->m_Request[go_up].m_Parent;
        }
        return RESULT_OK;
    }

    static bool PopHints(HPreloader preloader)
    {