Added scaleRatio to unify the cbuffer definition for all shaders, including the fragment shader variant.

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/SGSR2/SGSR2.cs

@@ -24,6 +24,7 @@ public static class SGSR2
         public float cameraNear;
         public float minLerpContribution;
 
+        public Vector2 scaleRatio;
         public uint bSameCamera;
         public uint reset;
     }

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/SGSR2/Shaders/2_pass_cs/sgsr2_upscale.compute

@@ -263,7 +263,7 @@ void CS(uint3 gl_GlobalInvocationID : SV_DispatchThreadID)
     rectboxmin = max(rectboxmin, boxmin);
 
     float3 clampedcolor = clamp(HistoryColor, rectboxmin, rectboxmax);
-    float startLerpValue = MinLerpContribution; //MinLerpContribution; //MinLerpContribution;
+    float startLerpValue = minLerpContribution; //MinLerpContribution; //MinLerpContribution;
     if ((abs(mda.x) + abs(mda.y)) > 0.000001) startLerpValue = 0.0;
     float lerpcontribution = (any(rectboxmin > HistoryColor) || any(HistoryColor > rectboxmax)) ? startLerpValue : 1.0f;
 

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/SGSR2/Shaders/sgsr2_common.hlsl

@@ -24,7 +24,8 @@ cbuffer Params : register(b0)
     float   preExposure;
     float   cameraFovAngleHor;
     float   cameraNear;
-    float                MinLerpContribution;
+    float   minLerpContribution;
+    float2  scaleRatio;
     uint    bSameCamera;
     uint    reset;
 };

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/SGSR2Upscaler.cs

@@ -67,9 +67,10 @@ namespace UnityEngine.Rendering.PostProcessing
             parms.jitterOffset = config.JitterOffset;
             parms.clipToPrevClip = clipToPrevClip;
             parms.preExposure = config.preExposure;
-            parms.cameraFovAngleHor = Mathf.Tan(context.camera.fieldOfView * Mathf.Deg2Rad * 0.5f) * (float)parms.renderSize.x / parms.renderSize.y;
+            parms.cameraFovAngleHor = Mathf.Tan(context.camera.fieldOfView * Mathf.Deg2Rad * 0.5f) * parms.renderSize.x * parms.renderSizeRcp.y;
             parms.cameraNear = context.camera.nearClipPlane;
             parms.minLerpContribution = 0f;
+            parms.scaleRatio = new Vector2(parms.renderSize.x * parms.displaySizeRcp.x, parms.renderSize.y * parms.displaySizeRcp.y);
             parms.bSameCamera = isCameraStill ? 1u : 0u;
             parms.reset = config.Reset ? 1u : 0u;
             _paramsBuffer.UpdateBufferData(cmd);