R32_UINTでR32_FLOAT

http://aras-p.info/blog/2009/07/30/encoding-floats-to-rgba-the-final/

inline float4 EncodeFloatRGBA( float v ) {   float4 enc = float4(1.0, 255.0, 65025.0, 160581375.0) * v;   enc = frac(enc);   enc -= enc.yzww * float4(1.0/255.0,1.0/255.0,1.0/255.0,0.0);   return enc; } inline float DecodeFloatRGBA( float4 rgba ) {   return dot( rgba, float4(1.0, 1/255.0, 1/65025.0, 1/160581375.0) ); }