Move ComputeTextureLOD to common.hlsl

ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/Common.hlsl

 #define real3x3 half3x3
 #define real3x4 half3x4
 #define real4x3 half4x3
-#define real4x4 half4x4
-
-#define half min16float
-#define half2 min16float2
-#define half3 min16float3
-#define half4 min16float4
-
-#define half2x2 min16float2x2
-#define half2x3 min16float2x3
-#define half3x2 min16float3x2
-#define half3x3 min16float3x3
-#define half3x4 min16float3x4
-#define half4x3 min16float4x3
+#define real4x4 half4x4
+
+#define half min16float
+#define half2 min16float2
+#define half3 min16float3
+#define half4 min16float4
+
+#define half2x2 min16float2x2
+#define half2x3 min16float2x3
+#define half3x2 min16float3x2
+#define half3x3 min16float3x3
+#define half3x4 min16float3x4
+#define half4x3 min16float4x3
 #define half4x4 min16float4x4
 
 #define REAL_MIN HALF_MIN
 // Texture utilities
 // ----------------------------------------------------------------------------
 
-float ComputeTextureLOD(float2 uv)
+float ComputeTextureLOD(float2 uvdx, float2 uvdy, float2 scale)
-    float2 ddx_ = ddx(uv);
-    float2 ddy_ = ddy(uv);
+    float2 ddx_ = scale * uvdx;
+    float2 ddy_ = scale * uvdy;
+
+float ComputeTextureLOD(float2 uv)
+{
+    float2 ddx_ = ddx(uv);
+    float2 ddy_ = ddy(uv);
+
+    return ComputeTextureLOD(ddx_, ddy_, 1.0);
+}
 
 // x contains width, w contains height
 float ComputeTextureLOD(float2 uv, float2 texelSize)

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Decal/DecalUtilities.hlsl

 	matMask |= mapMask;
 }
 
-float ComputeTextureLOD(float2 uvdx, float2 uvdy, float2 scale)
-{
-	float2 ddx_ = scale * uvdx;
-	float2 ddy_ = scale * uvdy;
-	float d = max(dot(ddx_, ddx_), dot(ddy_, ddy_));
-
-	return max(0.5 * log2(d), 0.0);
-}
-
 void AddDecalContribution(PositionInputs posInput, inout SurfaceData surfaceData, inout float alpha)
 {
 	if(_EnableDBuffer)