将范围内的两个浮点数打包成一个浮点数

Question

在 HLSL 中，我将如何以最佳精度将 0-1 范围内的两个浮点数打包成一个浮点数。这对于进一步压缩我的 GBuffer 非常有用。

Answer 1

//Packing
float a = 0.45;
float b = 0.55;
uint aScaled = a * 0xFFFF;
uint bScaled = b * 0xFFFF;
uint abPacked = (aScaled << 16) | (bScaled & 0xFFFF);
float finalFloat = asfloat(abPacked);

//Unpacking
float inputFloat = finalFloat;
uint uintInput = asuint(inputFloat);
float aUnpacked = (uintInput >> 16) / 65535.0f;
float bUnpacked = (uintInput & 0xFFFF) / 65535.0f;