Function LoadRegistrySystemLayers

vkconfig_core/registry.cpp:118–199

This is for Windows only. It looks for device specific layers in the Windows registry.

/// This is for Windows only. It looks for device specific layers in the Windows registry.
std::vector<Path> LoadRegistrySystemLayers(const char *input_path) {
    std::vector<Path> layers_paths;

    QString path(input_path);

    QString root_string = path.section('\\', 0, 0);
    static QHash<QString, HKEY> root_keys = {
        {"HKEY_CLASSES_ROOT", HKEY_CLASSES_ROOT},
        {"HKEY_CURRENT_CONFIG", HKEY_CURRENT_CONFIG},
        {"HKEY_CURRENT_USER", HKEY_CURRENT_USER},
        {"HKEY_LOCAL_MACHINE", HKEY_LOCAL_MACHINE},
        {"HKEY_USERS", HKEY_USERS},
    };

    HKEY root = HKEY_CURRENT_USER;
    for (auto label : root_keys.keys()) {
        if (label == root_string) {
            root = root_keys[label];
            break;
        }
    }

    static const QString DISPLAY_GUID = "{4d36e968-e325-11ce-bfc1-08002be10318}";
    static const QString SOFTWARE_COMPONENT_GUID = "{5c4c3332-344d-483c-8739-259e934c9cc8}";
    static const ULONG FLAGS = CM_GETIDLIST_FILTER_CLASS | CM_GETIDLIST_FILTER_PRESENT;

    ULONG device_names_size;
    wchar_t *device_names = nullptr;
    do {
        CM_Get_Device_ID_List_SizeW(&device_names_size, (LPCWSTR)DISPLAY_GUID.utf16(), FLAGS);
        if (device_names != nullptr) {
            delete[] device_names;
        }
        device_names = new wchar_t[device_names_size];
    } while (CM_Get_Device_ID_ListW((LPCWSTR)DISPLAY_GUID.utf16(), device_names, device_names_size, FLAGS) == CR_BUFFER_SMALL);

    if (device_names != nullptr) {
        QString entry;
        // This has already been set by now
        if (path.endsWith("VulkanExplicitLayers")) {
            entry = "VulkanExplicitLayers";
            // type = LAYER_TYPE_EXPLICIT;
        } else if (path.endsWith("VulkanImplicitLayers")) {
            entry = "VulkanImplicitLayers";
            // type = LAYER_TYPE_IMPLICIT;
        }

        for (wchar_t *device_name = device_names; device_name[0] != '\0'; device_name += wcslen(device_name) + 1) {
            DEVINST device_id;
            if (CM_Locate_DevNodeW(&device_id, device_name, CM_LOCATE_DEVNODE_NORMAL) != CR_SUCCESS) {
                continue;
            }
            LoadDeviceRegistry(device_id, entry, layers_paths);

            DEVINST child_id;
            if (CM_Get_Child(&child_id, device_id, 0) != CR_SUCCESS) {
                continue;
            }