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

@@ -23,7 +23,8 @@ public static class SGSR2
         public float cameraFovAngleHor;
         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

@@ -14,19 +14,20 @@
 
 cbuffer Params : register(b0)
 {
-    uint2                renderSize;
-    uint2                displaySize;
-    float2               renderSizeRcp;
-    float2               displaySizeRcp;
-    float2               jitterOffset;
-    float2               padding1;
-    float4               clipToPrevClip[4];
-    float                preExposure;
-    float                cameraFovAngleHor;
-    float                cameraNear;
-    float                MinLerpContribution;
-    uint                 bSameCamera;
-    uint                 reset;
+    uint2   renderSize;
+    uint2   displaySize;
+    float2  renderSizeRcp;
+    float2  displaySizeRcp;
+    float2  jitterOffset;
+    float2  padding1;
+    float4  clipToPrevClip[4];
+    float   preExposure;
+    float   cameraFovAngleHor;
+    float   cameraNear;
+    float   minLerpContribution;
+    float2  scaleRatio;
+    uint    bSameCamera;
+    uint    reset;
 };
 
 float FastLanczos(float base)

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);