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.Common/Configuration/ConfigurationState.cs

@@ -271,6 +271,16 @@ namespace Ryujinx.Configuration
             /// </summary>
             public ReactiveObject<float> MaxAnisotropy { get; private set; }
 
+            /// <summary>
+            /// Resolution Scale. An integer scale applied to applicable render targets. Values 1-4, or -1 to use a custom floating point scale instead.
+            /// </summary>
+            public ReactiveObject<int> ResScale { get; private set; }
+
+            /// <summary>
+            /// Custom Resolution Scale. A custom floating point scale applied to applicable render targets. Only active when Resolution Scale is -1.
+            /// </summary>
+            public ReactiveObject<float> ResScaleCustom { get; private set; }
+
             /// <summary>
             /// Dumps shaders in this local directory
             /// </summary>
@@ -283,6 +293,8 @@ namespace Ryujinx.Configuration
 
             public GraphicsSection()
             {
+                ResScale        = new ReactiveObject<int>();
+                ResScaleCustom  = new ReactiveObject<float>();
                 MaxAnisotropy   = new ReactiveObject<float>();
                 ShadersDumpPath = new ReactiveObject<string>();
                 EnableVsync     = new ReactiveObject<bool>();
@@ -354,6 +366,8 @@ namespace Ryujinx.Configuration
             ConfigurationFileFormat configurationFile = new ConfigurationFileFormat
             {
                 Version                   = ConfigurationFileFormat.CurrentVersion,
+                ResScale                  = Graphics.ResScale,
+                ResScaleCustom            = Graphics.ResScaleCustom,
                 MaxAnisotropy             = Graphics.MaxAnisotropy,
                 GraphicsShadersDumpPath   = Graphics.ShadersDumpPath,
                 LoggingEnableDebug        = Logger.EnableDebug,
@@ -410,6 +424,8 @@ namespace Ryujinx.Configuration
 
         public void LoadDefault()
         {
+            Graphics.ResScale.Value                = 1;
+            Graphics.ResScaleCustom.Value          = 1.0f;
             Graphics.MaxAnisotropy.Value           = -1;
             Graphics.ShadersDumpPath.Value         = "";
             Logger.EnableDebug.Value               = false;
@@ -652,10 +668,22 @@ namespace Ryujinx.Configuration
                 configurationFileUpdated = true;
             }
 
+            if (configurationFileFormat.Version < 11)
+            {
+                Common.Logging.Logger.PrintWarning(LogClass.Application, $"Outdated configuration version {configurationFileFormat.Version}, migrating to version 11.");
+
+                configurationFileFormat.ResScale = 1;
+                configurationFileFormat.ResScaleCustom = 1.0f;
+
+                configurationFileUpdated = true;
+            }
+
             List<InputConfig> inputConfig = new List<InputConfig>();
             inputConfig.AddRange(configurationFileFormat.ControllerConfig);
             inputConfig.AddRange(configurationFileFormat.KeyboardConfig);
 
+            Graphics.ResScale.Value                = configurationFileFormat.ResScale;
+            Graphics.ResScaleCustom.Value          = configurationFileFormat.ResScaleCustom;
             Graphics.MaxAnisotropy.Value           = configurationFileFormat.MaxAnisotropy;
             Graphics.ShadersDumpPath.Value         = configurationFileFormat.GraphicsShadersDumpPath;
             Logger.EnableDebug.Value               = configurationFileFormat.LoggingEnableDebug;