TAA Phase 5: expose native TAA in the UI (Anti-Aliasing dropdown)

Adds AntiAliasing.Taa and a 'TAA' entry to Settings > Graphics > Anti-Aliasing,
so the native temporal AA is a normal user-selectable option alongside FXAA/SMAA
(it is a post-process effect, not a scaling filter). Selecting it instantiates
TemporalFilter as the active IPostProcessingEffect; applies live, no restart.
RYUJINX_TAA=1 still force-enables it as a dev override. On the OpenGL backend TAA
falls back to no AA (Vulkan-only feature). Validated in game via the UI.

Bakes the in-game-validated defaults so UI users get the tuned look with no env
vars: history blend 0.80, variance clamp 1.25 (RYUJINX_TAA_* still override).

src/Ryujinx.Common/Configuration/AntiAliasing.cs

@@ -11,5 +11,6 @@ namespace Ryujinx.Common.Configuration
         SmaaMedium,
         SmaaHigh,
         SmaaUltra,
+        Taa,
     }
 }

src/Ryujinx.Graphics.OpenGL/Window.cs

@@ -324,6 +324,7 @@ namespace Ryujinx.Graphics.OpenGL
                         _antiAliasing = new FxaaPostProcessingEffect(_renderer);
                         break;
                     case AntiAliasing.None:
+                    case AntiAliasing.Taa: // TAA is a Vulkan-only effect; on the GL backend it falls back to no AA.
                         _antiAliasing?.Dispose();
                         _antiAliasing = null;
                         break;

src/Ryujinx.Graphics.Vulkan/Effects/TemporalFilter.cs

@@ -20,10 +20,10 @@ namespace Ryujinx.Graphics.Vulkan.Effects
     /// the dominant cost), then the field is bilinear-upscaled and scaled by N when the blend reprojects the
     /// history. Motion estimation is self-contained (reuses the DLSS shaders) so TAA works with DLSS off.
     ///
-    /// Gated entirely on RYUJINX_TAA=1: when unset the present path never constructs or runs this, so the
+    /// Selected from the UI as an Anti-Aliasing option (AntiAliasing.Taa); RYUJINX_TAA=1 also force-enables it
-    /// default render is byte-identical. Tunables (no rebuild): RYUJINX_TAA_BLEND (history weight, default
+    /// (dev override). Tunables (no rebuild): RYUJINX_TAA_BLEND (history weight, default 0.80), RYUJINX_TAA_MV_SIGN
-    /// 0.90), RYUJINX_TAA_MV_SIGN (reprojection direction, default +1), RYUJINX_TAA_CLAMP (variance-box
+    /// (reprojection direction, default +1), RYUJINX_TAA_CLAMP (variance-box half-width in std-devs, default 1.25),
-    /// half-width in std-devs, default 1.0), RYUJINX_TAA_MV_DOWNSCALE (flow resolution divisor 1/2/4, default 2).
+    /// RYUJINX_TAA_MV_DOWNSCALE (flow resolution divisor 1/2/4, default 2).
     /// </summary>
     internal class TemporalFilter : IPostProcessingEffect
     {
@@ -91,7 +91,7 @@ namespace Ryujinx.Graphics.Vulkan.Effects
                 return blend;
             }
 
-            return 0.90f;
+            return 0.80f; // validated in-game default (sharp + steady); RYUJINX_TAA_BLEND overrides.
         }
 
         private static float ParseSign()
@@ -113,7 +113,7 @@ namespace Ryujinx.Graphics.Vulkan.Effects
                 return gamma;
             }
 
-            return 1.0f;
+            return 1.25f; // validated in-game default (lets native texture detail through); RYUJINX_TAA_CLAMP overrides.
         }
 
         private static int ParseDownscale()

src/Ryujinx.Graphics.Vulkan/Window.cs

@@ -37,7 +37,6 @@ namespace Ryujinx.Graphics.Vulkan
         private bool _updateEffect;
         private IPostProcessingEffect _effect;
         private IScalingFilter _scalingFilter;
-        private Effects.TemporalFilter _taa;
         private Dlss.DlssUpscaler _dlss;
         private bool _isLinear;
         private float _scalingFilterLevel;
@@ -395,14 +394,6 @@ namespace Ryujinx.Graphics.Vulkan
                 view = _effect.Run(view, cbs, _width, _height);
             }
 
-            // Native temporal anti-aliasing (clean-room), gated on RYUJINX_TAA=1. Runs at render resolution
-            // before the spatial upscale/blit, like a post-processing effect. Phase 0 is a pass-through.
-            if (Effects.TemporalFilter.IsEnabled)
-            {
-                _taa ??= new Effects.TemporalFilter(_gd, _device);
-                view = _taa.Run(view, cbs, _width, _height);
-            }
-
             int srcX0, srcX1, srcY0, srcY1;
 
             if (crop.Left == 0 && crop.Right == 0)
@@ -615,12 +606,22 @@ namespace Ryujinx.Graphics.Vulkan
             {
                 _updateEffect = false;
 
-                switch (_currentAntiAliasing)
+                // RYUJINX_TAA=1 forces the native temporal filter regardless of the UI selection (dev override).
+                AntiAliasing antiAliasing = Effects.TemporalFilter.IsEnabled ? AntiAliasing.Taa : _currentAntiAliasing;
+
+                switch (antiAliasing)
                 {
                     case AntiAliasing.Fxaa:
                         _effect?.Dispose();
                         _effect = new FxaaPostProcessingEffect(_gd, _device);
                         break;
+                    case AntiAliasing.Taa:
+                        if (_effect is not Effects.TemporalFilter)
+                        {
+                            _effect?.Dispose();
+                            _effect = new Effects.TemporalFilter(_gd, _device);
+                        }
+                        break;
                     case AntiAliasing.None:
                         _effect?.Dispose();
                         _effect = null;
@@ -791,7 +792,6 @@ namespace Ryujinx.Graphics.Vulkan
 
                 _effect?.Dispose();
                 _scalingFilter?.Dispose();
-                _taa?.Dispose();
                 _dlss?.Dispose();
             }
         }

src/Ryujinx/UI/Views/Settings/SettingsGraphicsView.axaml

@@ -290,6 +290,8 @@
                                     Content="{ext:Locale SmaaHigh}" />
                                 <ComboBoxItem
                                     Content="{ext:Locale SmaaUltra}" />
+                                <ComboBoxItem
+                                    Content="TAA" />
                             </ComboBox>
                         </StackPanel>
                     </StackPanel>