public static ushort Float32ToUInt16(float value)
{
var f32infty = new Float32IntegerUnion {
I = 255 << 23
};
var f16infty = new Float32IntegerUnion {
I = 31 << 23
};
var magic = new Float32IntegerUnion {
I = 15 << 23
};
var inval = new Float32IntegerUnion {
F = value
};
var sign_mask = 0x80000000;
var round_mask = ~0xFFFU;
var sign = inval.I & sign_mask;
inval.I ^= sign;
ushort @out;
if (inval.I >= f32infty.I) // Inf or NaN (all exponent bits set)
{
@out = (ushort)(inval.I > f32infty.I ? 0x7FFFu : 0x7C00u);
}
else
{
inval.I &= round_mask;
inval.F *= magic.F;
inval.I -= round_mask;
if (inval.I > f16infty.I)
{
inval.I = f16infty.I; // Clamp to signed infinity if overflowed
}
@out = (ushort)((inval.I >> 13) & 0xFFFF); // Take the bits!
}
return((ushort)(@out | (sign >> 16) & 0xFFFF));
}
public static float UInt16ToFloat32(ushort value)
{
var magic = new Float32IntegerUnion {
I = (254 - 15) << 23
};
var was_inf_nan = new Float32IntegerUnion {
I = (127 + 16) << 23
};
var union = new Float32IntegerUnion {
I = ((uint)value & 0x7FFF) << 13
}; // exponent/mantissa bits
union.F *= magic.F; // exponent adjust
if (union.F >= was_inf_nan.F) // make sure Inf/NaN survive
{
union.I |= 255 << 23;
}
union.I |= ((uint)value & 0x8000) << 16; // sign bit
return(union.F);
}
