Reverted rework of accumulation parameter initialization function to what it originally was, but with a struct clear to zero.

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/ASR/Shaders/shaders/fsr2/ffxm_fsr2_accumulate.h

@@ -260,8 +260,11 @@ void initIsNewSample(FFXM_PARAMETER_INOUT AccumulationPassCommonParams params)
     params.bIsNewSample = (params.bIsExistingSample == false || bIsResetFrame);
 }
 
-void InitParams(FFXM_PARAMETER_INOUT AccumulationPassCommonParams params, FfxInt32x2 iPxHrPos)
+
+AccumulationPassCommonParams InitParams(FfxInt32x2 iPxHrPos)
 {
+    AccumulationPassCommonParams params = (AccumulationPassCommonParams)0;
+
     params.iPxHrPos = iPxHrPos;
     const FfxFloat32x2 fHrUv = (iPxHrPos + 0.5f) / DisplaySize();
     params.fHrUv = fHrUv;
@@ -273,12 +276,13 @@ void InitParams(FFXM_PARAMETER_INOUT AccumulationPassCommonParams params, FfxInt
     params.fHrVelocity = GetPxHrVelocity(params.fMotionVector);
 
     ComputeReprojectedUVs(params, params.fReprojectedHrUv, params.bIsExistingSample);
+
+    return params;
 }
 
 AccumulateOutputs Accumulate(FfxInt32x2 iPxHrPos)
 {
-    AccumulationPassCommonParams params = (AccumulationPassCommonParams)0;
-    InitParams(params, iPxHrPos);
+    AccumulationPassCommonParams params = InitParams(iPxHrPos);
 
     FfxFloat32x3 fHistoryColor = FfxFloat32x3(0, 0, 0);
     FFXM_MIN16_F2 fLockStatus;