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Runtime/HDRP/Shaders/DecodeDepthNormals.hlsl

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+//#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Material/NormalBuffer.hlsl"
+
+#ifndef DECODEDEPTHNORMALS_INCLUDED
+#define DECODEDEPTHNORMALS_INCLUDED
+
+
+inline float DecodeFloatRG(float2 enc) {
+    float2 kDecodeDot = float2(1.0, 1 / 255.0);
+    return dot(enc, kDecodeDot);
+}
+
+inline float3 DecodeViewNormalStereo(float4 enc4) {
+    float kScale = 1.7777;
+    float3 nn = enc4.xyz * float3(2 * kScale, 2 * kScale, 0) + float3(-kScale, -kScale, 1);
+    float g = 2.0 / dot(nn.xyz, nn.xyz);
+    float3 n;
+    n.xy = g * nn.xy;
+    n.z = g - 1;
+    return n;
+}
+
+inline void DecodeDepthNormal(float4 enc, out float depth, out float3 normal) {
+    depth = DecodeFloatRG(enc.zw);
+    normal = DecodeViewNormalStereo(enc);
+}
+
+#endif