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.Shader/CodeGen/Glsl/CodeGenContext.cs

@@ -1,3 +1,5 @@
+using Ryujinx.Graphics.Shader.IntermediateRepresentation;
+using Ryujinx.Graphics.Shader.StructuredIr;
 using Ryujinx.Graphics.Shader.Translation;
 using System.Collections.Generic;
 using System.Text;
@@ -75,6 +77,21 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Glsl
             AppendLine("}" + suffix);
         }
 
+        public int FindTextureDescriptorIndex(AstTextureOperation texOp)
+        {
+            AstOperand operand = texOp.GetSource(0) as AstOperand;
+            bool bindless = (texOp.Flags & TextureFlags.Bindless) > 0;
+
+            int cBufSlot = bindless ? operand.CbufSlot : 0;
+            int cBufOffset = bindless ? operand.CbufOffset : 0;
+
+            return TextureDescriptors.FindIndex(descriptor => 
+                descriptor.Type == texOp.Type && 
+                descriptor.HandleIndex == texOp.Handle && 
+                descriptor.CbufSlot == cBufSlot &&
+                descriptor.CbufOffset == cBufOffset);
+        }
+
         private void UpdateIndentation()
         {
             _indentation = GetIndentation(_level);