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/Image/TextureBase.cs

@@ -1,5 +1,6 @@
 using OpenTK.Graphics.OpenGL;
 using Ryujinx.Graphics.GAL;
+using System;
 
 namespace Ryujinx.Graphics.OpenGL.Image
 {
@@ -9,15 +10,19 @@ namespace Ryujinx.Graphics.OpenGL.Image
 
         protected TextureCreateInfo Info { get; }
 
-        public int Width => Info.Width;
-        public int Height => Info.Height;
+        public int Width { get; }
+        public int Height { get; }
+        public float ScaleFactor { get; }
 
         public Target Target => Info.Target;
         public Format Format => Info.Format;
 
-        public TextureBase(TextureCreateInfo info)
+        public TextureBase(TextureCreateInfo info, float scaleFactor = 1f)
         {
             Info = info;
+            Width = (int)Math.Ceiling(Info.Width * scaleFactor);
+            Height = (int)Math.Ceiling(Info.Height * scaleFactor);
+            ScaleFactor = scaleFactor;
 
             Handle = GL.GenTexture();
         }