Initial work

Ryujinx.Graphics.GAL/IBuffer.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace Ryujinx.Graphics.GAL
+{
+    public interface IBuffer : IDisposable
+    {
+        void CopyTo(IBuffer destination, int srcOffset, int dstOffset, int size);
+
+        byte[] GetData(int offset, int size);
+
+        void SetData(Span<byte> data);
+
+        void SetData(int offset, Span<byte> data);
+    }
+}