Add Support for Post Processing Effects (#3616)

* Add Post Processing Effects

* fix events and shader issues

* fix gtk upscale slider value

* fix bgra games

* don't swap swizzle if already swapped

* restore opengl texture state after effects run

* addressed review

* use single pipeline for smaa and fsr

* call finish on all pipelines

* addressed review

* attempt fix file case

* attempt fixing file case

* fix filter level tick frequency

* adjust filter slider margins

* replace fxaa shaders with original shader

* addressed review

Ryujinx.Graphics.GAL/AntiAliasing.cs

@@ -0,0 +1,12 @@
+namespace Ryujinx.Graphics.GAL
+{
+    public enum AntiAliasing
+    {
+        None,
+        Fxaa,
+        SmaaLow,
+        SmaaMedium,
+        SmaaHigh,
+        SmaaUltra
+    }
+}

Ryujinx.Graphics.GAL/IWindow.cs

@@ -9,5 +9,9 @@ namespace Ryujinx.Graphics.GAL
         void SetSize(int width, int height);
 
         void ChangeVSyncMode(bool vsyncEnabled);
+
+        void SetAntiAliasing(AntiAliasing antialiasing);
+        void SetScalingFilter(ScalingFilter type);
+        void SetScalingFilterLevel(float level);
     }
 }

Ryujinx.Graphics.GAL/Multithreading/ThreadedWindow.cs

@@ -32,5 +32,11 @@ namespace Ryujinx.Graphics.GAL.Multithreading
         }
 
         public void ChangeVSyncMode(bool vsyncEnabled) { }
+
+        public void SetAntiAliasing(AntiAliasing effect) { }
+
+        public void SetScalingFilter(ScalingFilter type) { }
+
+        public void SetScalingFilterLevel(float level) { }
     }
 }

Ryujinx.Graphics.GAL/UpscaleType.cs

@@ -0,0 +1,9 @@
+namespace Ryujinx.Graphics.GAL
+{
+    public enum ScalingFilter
+    {
+        Bilinear,
+        Nearest,
+        Fsr
+    }
+}