243 struct loader_instance {  struct
244     struct loader_instance_dispatch_table *disp;  // must be first entry in structure  argument
265     struct loader_instance *next;  argument
267     uint32_t total_icd_count;
268     struct loader_icd_term *icd_terms;
292     struct loader_instance_extension_enables enabled_known_extensions;  argument
295     VkLayerDbgFunctionNode *DbgFunctionHead;
300     VkLayerDbgFunctionNode *InstanceCreationDeletionDebugFunctionHead;
302     VkAllocationCallbacks alloc_callbacks;
304     bool portability_enumeration_enabled;
306     bool wsi_surface_enabled;
308     bool wsi_win32_surface_enabled;
311     bool wsi_wayland_surface_enabled;
314     bool wsi_xcb_surface_enabled;
317     bool wsi_xlib_surface_enabled;
320     bool wsi_directfb_surface_enabled;
323     bool wsi_android_surface_enabled;
326     bool wsi_ohos_surface_enabled;
329     bool wsi_macos_surface_enabled;
332     bool wsi_ios_surface_enabled;
335     bool wsi_ggp_surface_enabled;
337     bool wsi_headless_surface_enabled;
339     bool wsi_metal_surface_enabled;
342     bool wsi_imagepipe_surface_enabled;
345     bool wsi_screen_surface_enabled;
348     bool wsi_vi_surface_enabled;
350     bool wsi_display_enabled;
374     struct loader_instance_dispatch_table *disp;  // must be first entry in structure  argument
375     struct loader_instance *this_instance;  argument