Allow copy destination to have a different scale from source (#1711)

* Allow copy destination to have a different scale from source

Will result in more scaled copy destinations, but allows scaling in some games that copy textures to the output framebuffer.

* Support copying multiple levels/layers

Uses glFramebufferTextureLayer to copy multiple layers, copies levels individually (and scales the regions).

Remove CopyArrayScaled, since the backend copy handles it now.

Ryujinx.Graphics.GAL/Extents2D.cs

@@ -1,3 +1,5 @@
+using Ryujinx.Common;
+
 namespace Ryujinx.Graphics.GAL
 {
     public struct Extents2D
@@ -14,5 +16,16 @@ namespace Ryujinx.Graphics.GAL
             X2 = x2;
             Y2 = y2;
         }
+
+        public Extents2D Reduce(int level)
+        {
+            int div = 1 << level;
+            
+            return new Extents2D(
+                X1 >> level, 
+                Y1 >> level,
+                BitUtils.DivRoundUp(X2, div),
+                BitUtils.DivRoundUp(Y2, div));
+        }
     }
 }