Implement Zero-Configuration Resolution Scaling (#1365)

* Initial implementation of Render Target Scaling

Works with most games I have. No GUI option right now, it is hardcoded.

Missing handling for texelFetch operation.

* Realtime Configuration, refactoring.

* texelFetch scaling on fragment shader (WIP)

* Improve Shader-Side changes.

* Fix potential crash when no color/depth bound

* Workaround random uses of textures in compute.

This was blacklisting textures in a few games despite causing no bugs. Will eventually add full support so this doesn't break anything.

* Fix scales oscillating when changing between non-native scales.

* Scaled textures on compute, cleanup, lazier uniform update.

* Cleanup.

* Fix stupidity

* Address Thog Feedback.

* Cover most of GDK's feedback (two comments remain)

* Fix bad rename

* Move IsDepthStencil to FormatExtensions, add docs.

* Fix default config, square texture detection.

* Three final fixes:

- Nearest copy when texture is integer format.
- Texture2D -> Texture3D copy correctly blacklists the texture before trying an unscaled copy (caused driver error)
- Discount small textures.

* Remove scale threshold.

Not needed right now - we'll see if we run into problems.

* All CPU modification blacklists scale.

* Fix comment.

Ryujinx.Graphics.OpenGL/Window.cs

@@ -65,11 +65,12 @@ namespace Ryujinx.Graphics.OpenGL
             GL.Clear(ClearBufferMask.ColorBufferBit);
 
             int srcX0, srcX1, srcY0, srcY1;
+            float scale = view.ScaleFactor;
 
             if (crop.Left == 0 && crop.Right == 0)
             {
                 srcX0 = 0;
-                srcX1 = view.Width;
+                srcX1 = (int)(view.Width / scale);
             }
             else
             {
@@ -80,7 +81,7 @@ namespace Ryujinx.Graphics.OpenGL
             if (crop.Top == 0 && crop.Bottom == 0)
             {
                 srcY0 = 0;
-                srcY1 = view.Height;
+                srcY1 = (int)(view.Height / scale);
             }
             else
             {
@@ -88,6 +89,14 @@ namespace Ryujinx.Graphics.OpenGL
                 srcY1 = crop.Bottom;
             }
 
+            if (scale != 1f)
+            {
+                srcX0 = (int)(srcX0 * scale);
+                srcY0 = (int)(srcY0 * scale);
+                srcX1 = (int)Math.Ceiling(srcX1 * scale);
+                srcY1 = (int)Math.Ceiling(srcY1 * scale);
+            }
+
             float ratioX = MathF.Min(1f, (_height * (float)NativeWidth)  / ((float)NativeHeight * _width));
             float ratioY = MathF.Min(1f, (_width  * (float)NativeHeight) / ((float)NativeWidth  * _height));