no need to use .xy to determine z

no need to use .xy to determine lin z

Assets/ScriptableRenderLoop/fptl/Internal-DeferredReflections.shader

 StructuredBuffer<SFiniteLightData> g_vLightData;
 
 
-float GetLinearDepth(float3 vP)
+float GetLinearDepth(float zDptBufSpace)	// 0 is near 1 is far
-	Vec3 var = 1.0;
-	//float4 v4Pres = mul(float4(vP,1.0), g_mInvScrProjection);
+	float3 vP = float3(0.0f,0.0f,zDptBufSpace);
 	float4 v4Pres = mul(g_mInvScrProjection, float4(vP,1.0));
 	return v4Pres.z / v4Pres.w;
 }
 float3 ExecuteReflectionProbes(uint2 pixCoord, const uint offs)
 {
 	float3 v3ScrPos = float3(pixCoord.x+0.5, pixCoord.y+0.5, FetchDepth(_CameraDepthTexture, pixCoord.xy).x);
-	float linDepth = GetLinearDepth(v3ScrPos);
+	float linDepth = GetLinearDepth(v3ScrPos.z);
 	float3 vP = GetViewPosFromLinDepth(v3ScrPos.xy, linDepth);
 	float3 worldPos = mul(g_mViewToWorld, float4(vP.xyz,1.0)).xyz;		//unity_CameraToWorld
 

Assets/ScriptableRenderLoop/fptl/Internal-DeferredShading.shader

 
 
 
-
-
-float GetLinearDepth(float3 vP)
+float GetLinearDepth(float zDptBufSpace)	// 0 is near 1 is far
-	Vec3 var = 1.0;
-	//float4 v4Pres = mul(float4(vP,1.0), g_mInvScrProjection);
+	float3 vP = float3(0.0f,0.0f,zDptBufSpace);
 	float4 v4Pres = mul(g_mInvScrProjection, float4(vP,1.0));
 	return v4Pres.z / v4Pres.w;
 }
 float3 ExecuteLightList(uint2 pixCoord, const uint offs)
 {
 	float3 v3ScrPos = float3(pixCoord.x+0.5, pixCoord.y+0.5, FetchDepth(_CameraDepthTexture, pixCoord.xy).x);
-	float linDepth = GetLinearDepth(v3ScrPos);
+	float linDepth = GetLinearDepth(v3ScrPos.z);
 	float3 vP = GetViewPosFromLinDepth(v3ScrPos.xy, linDepth);
 
 	float3 vWSpaceVDir = normalize(mul((float3x3) g_mViewToWorld, -vP).xyz);		//unity_CameraToWorld

Assets/ScriptableRenderLoop/fptl/lightlistbuild.compute

 groupshared int ldsModelListCount[2];		// since NR_LIGHT_MODELS is 2
 
 
-float GetLinearDepth(float3 vP)
+//float GetLinearDepth(float3 vP)
+//{
+//	float4 v4Pres = mul(g_mInvScrProjection, float4(vP,1.0));
+//	return v4Pres.z / v4Pres.w;
+//}
+
+float GetLinearDepth(float zDptBufSpace)	// 0 is near 1 is far
+	float3 vP = float3(0.0f,0.0f,zDptBufSpace);
 	float4 v4Pres = mul(g_mInvScrProjection, float4(vP,1.0));
 	return v4Pres.z / v4Pres.w;
 }
 			int idx = t + i*NR_THREADS;
 			uint2 uCrd = min( uint2(viTilLL.x+(idx&0xf), viTilLL.y+(idx>>4)), uint2(iWidth-1, iHeight-1) );
 			float3 v3ScrPos = float3(uCrd.x+0.5, uCrd.y+0.5, FetchDepth(g_depth_tex, uCrd));
-			vLinDepths[i] = GetLinearDepth(v3ScrPos);
+			vLinDepths[i] = GetLinearDepth(v3ScrPos.z);
 		}
 
 		uint uLightsFlags[2] = {0,0};