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/_schema.json

@@ -700,6 +700,27 @@
     }
   },
   "properties": {
+    "res_scale": {
+      "$id": "#/properties/res_scale",
+      "type": "integer",
+      "title": "Resolution Scale",
+      "description": "An integer scale applied to applicable render targets. Values 1-4, or -1 to use a custom floating point scale instead.",
+      "default": -1,
+      "examples": [
+        -1,
+        1,
+        2,
+        3,
+        4
+      ]
+    },
+    "res_scale_custom": {
+      "$id": "#/properties/res_scale_custom",
+      "type": "number",
+      "title": "Custom Resolution Scale",
+      "description": "A custom floating point scale applied to applicable render targets. Only active when Resolution Scale is -1.",
+      "default": 1.0,
+    },
     "max_anisotropy": {
       "$id": "#/properties/max_anisotropy",
       "type": "integer",
@@ -1211,7 +1232,7 @@
             "button_sr": "Unbound"
           }
         }
-      ] 
+      ]
     },
     "controller_config": {
       "$id": "#/properties/controller_config",