Use real in Filtering.hlsl

ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/Filtering.hlsl

 // Cardinal (interpolating) B-Spline of the 2nd degree (3rd order). Support = 3x3.
 // The fractional coordinate of each part is assumed to be in the [0, 1] range (centered on 0.5).
 // https://www.desmos.com/calculator/47j9r9lolm
-float2 BSpline2IntLeft(float2 x)
+real2 BSpline2IntLeft(real2 x)
-float2 BSpline2IntMiddle(float2 x)
+real2 BSpline2IntMiddle(real2 x)
-float2 BSpline2IntRight(float2 x)
+real2 BSpline2IntRight(real2 x)
 {
     return (0.5 * x - 1) * x + 0.5;
 }
 // Inspired by: http://vec3.ca/bicubic-filtering-in-fewer-taps/
-void BiquadraticFilter(float2 fracCoord, out float2 weights[2], out float2 offsets[2])
+void BiquadraticFilter(real2 fracCoord, out real2 weights[2], out real2 offsets[2])
-    float2 l = BSpline2IntLeft(fracCoord);
-    float2 m = BSpline2IntMiddle(fracCoord);
-    float2 r = 1 - l - m;
+    real2 l = BSpline2IntLeft(fracCoord);
+    real2 m = BSpline2IntMiddle(fracCoord);
+    real2 r = 1 - l - m;
 
     // Compute offsets for 4x bilinear taps for the quadratic B-Spline reconstruction kernel.
     // 0: lerp between left and middle