more loader redoing (for instance)

projects/apis/metal/loader/metal_instance_loader.m

@@ -3,10 +3,15 @@
 #include "surface/metal_surface.h"
 #include "devices/metal_output_devices.h"
 
+gryphnInstanceFunctionLayers metalLoadAPILayer() {
+    return (gryphnInstanceFunctionLayers) {
+        .createInstance = { metalCreateInstance, NULL },
+        .destroyInstance = { metalDestroyInstance, NULL }
+    };
+}
+
 gnInstanceFunctions loadMetalInstanceFunctions() {
     return (gnInstanceFunctions){
-        ._gnCreateInstance = createMetalInstance,
-        ._gnDestroyInstance = destroyMetalInstance,
         ._gnGetPhysicalDevices = getMetalDevices,
         ._gnPhysicalDeviceCanPresentToSurface = metalCanDevicePresent,
         ._gnCreateOutputDevice = createMetalOutputDevice,

projects/apis/metal/loader/metal_loader.h

@@ -5,6 +5,9 @@
 #include "extensions/synchronization/loader/sync_functions.h"
 #include "core/gryphn_extensions.h"
 
+typedef struct gryphnInstanceFunctionLayers gryphnInstanceFunctionLayers;
+gryphnInstanceFunctionLayers metalLoadAPILayer();
+
 gnInstanceFunctions loadMetalInstanceFunctions();
 gnDeviceFunctions loadMetalDeviceFunctions();
 gnCommandFunctions loadMetalCommandFunctions();