Revert "Revert "fix native api loading.""

This reverts commit ae2aee402d.

src/Skia/Avalonia.Skia/Gpu/Metal/SkiaMetalApi.cs

@@ -2,6 +2,7 @@ using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Reflection;
 using System.Runtime.InteropServices;
+using Avalonia.Compatibility;
 using Avalonia.Platform.Interop;
 using SkiaSharp;
 using BindingFlags = System.Reflection.BindingFlags;
@@ -24,19 +25,23 @@ internal unsafe class SkiaMetalApi
     {
         // Make sure that skia is loaded
         GC.KeepAlive(new SKPaint());
-        
+
-        var loader = AvaloniaLocator.Current.GetRequiredService<IDynamicLibraryLoader>();
+        var dll = NativeLibraryEx.Load("libSkiaSharp");
-#if NET6_0_OR_GREATER
+
-        var dll = NativeLibrary.Load("libSkiaSharp", typeof(SKPaint).Assembly, null);
+        IntPtr address;
-#else
+
-        var dll = loader.LoadLibrary("libSkiaSharp");
+        if (NativeLibraryEx.TryGetExport(dll, "gr_direct_context_make_metal_with_options", out address))
-#endif
+        {
-        _gr_direct_context_make_metal_with_options = (delegate* unmanaged[Stdcall] <IntPtr, IntPtr, IntPtr, IntPtr>)
+            _gr_direct_context_make_metal_with_options =
-            loader.GetProcAddress(dll, "gr_direct_context_make_metal_with_options", false);
+                (delegate* unmanaged[Stdcall] <IntPtr, IntPtr, IntPtr, IntPtr>)address;
-        _gr_backendrendertarget_new_metal =
+        }
-            (delegate* unmanaged[Stdcall]<int, int, int, GRMtlTextureInfoNative*, IntPtr>)
+
-            loader.GetProcAddress(dll, "gr_backendrendertarget_new_metal", false);
+        if(NativeLibraryEx.TryGetExport(dll, "gr_backendrendertarget_new_metal", out address))
-        
+        {
+            _gr_backendrendertarget_new_metal =
+                (delegate* unmanaged[Stdcall]<int, int, int, GRMtlTextureInfoNative*, IntPtr>)address;
+        }
+
         _contextCtor = typeof(GRContext).GetConstructor(
             BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null,
             new[] { typeof(IntPtr), typeof(bool) }, null) ?? throw new MissingMemberException("GRContext.ctor(IntPtr,bool)");