Added new fabirc pbr mode;

Added new stocking surface feature;

Fixed the issue that diffuse bsdf is not energy conserving.
Fixed the bug that shader can not render alpha clip properly;

Runtime/Shaders/Includes/Common/UtsCommon.hlsl

@@ -50,6 +50,57 @@ float3 UtsComputeDiffuseColor(float3 baseColor, float metallic)
     return UtsComputeDiffuseColor(baseColor, metallic, 0.0);
 }
 
+float Random(float2 uv)
+{
+    return frac(sin(dot(uv, float2(12.9898, 78.233))) * 43758.5453);
+}
+
+float unity_noise_interpolate (float a, float b, float t)
+{
+    return (1.0-t)*a + (t*b);
+}
+
+float ValueNoise (float2 uv)
+{
+    float2 i = floor(uv);
+    float2 f = frac(uv);
+    f = f * f * (3.0 - 2.0 * f);
+
+    uv = abs(frac(uv) - 0.5);
+    float2 c0 = i + float2(0.0, 0.0);
+    float2 c1 = i + float2(1.0, 0.0);
+    float2 c2 = i + float2(0.0, 1.0);
+    float2 c3 = i + float2(1.0, 1.0);
+    float r0 = Random(c0);
+    float r1 = Random(c1);
+    float r2 = Random(c2);
+    float r3 = Random(c3);
+
+    float bottomOfGrid = unity_noise_interpolate(r0, r1, f.x);
+    float topOfGrid = unity_noise_interpolate(r2, r3, f.x);
+    float t = unity_noise_interpolate(bottomOfGrid, topOfGrid, f.y);
+    return t;
+}
+
+float SimpleNoise(float2 UV, float Scale)
+{
+    float t = 0.0;
+
+    float freq = pow(2.0, float(0));
+    float amp = pow(0.5, float(3-0));
+    t += ValueNoise(float2(UV.x*Scale/freq, UV.y*Scale/freq))*amp;
+
+    freq = pow(2.0, float(1));
+    amp = pow(0.5, float(3-1));
+    t += ValueNoise(float2(UV.x*Scale/freq, UV.y*Scale/freq))*amp;
+
+    freq = pow(2.0, float(2));
+    amp = pow(0.5, float(3-2));
+    t += ValueNoise(float2(UV.x*Scale/freq, UV.y*Scale/freq))*amp;
+
+    return t;
+}
+
 #define SampleRampSignalLine(texture, u) (SAMPLE_TEXTURE2D_LOD(texture, s_linear_clamp_sampler, float2(u, 0.5), 0))
 
 // Exposure
@@ -243,4 +294,4 @@ float3 GetWorldPosFromDepthBuffer(float2 clipPos01, float cameraDepth)
 	
 	return mul(unity_CameraToWorld, float4(localInvertDepthDirHD, 1.0)).xyz;
 }
-#endif
+#endif