Insufficient precision of Decode71 function

Encode71 and Decode71 in DeferredShadingCommon.ush are functions that convert 8-bit values ​​to 7-bit values ​​and mask values, and licensees have reported that the accuracy is insufficient when using the Decode71 function.

According to licensees, correct results can be obtained by changing the return part of Decode71() to the same processing as Encode() as shown below.

// return (Scalar - 0.5f * Mask) * 2.0f;
return (Scalar - (128.0f / 255.0f) * Mask) * (255.0f / 127.0f); 

Results
Input scalar: 0.7777, mask: 0
Output scalar: 0.7777, mask: 0
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Input scalar: 0.7777, mask: 1
Input scalar: 0.7777, mask: 1

1. Open the attached sample project
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2. Open the M_Decode71 material and change the scalar and mask values

Results
Input scalar: 0.7777, mask: 0
Output scalar: 0.7746, mask: 0
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Input scalar: 0.7777, mask: 1
Output scalar: 0.7785, mask: 1
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