將範圍內的兩個花車放入一個浮標中

Question

在HLSL中，我將如何將0-1範圍內的兩個花車打包到一個具有最佳精度的浮標中。這對於進一步壓縮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;