Hi,
I recently needed to retrieve a pixel from a 16 bits floating point formatted render target.

Code:
var var_from_float16short(short _s) {
	int _sign = _s & 32768;
	int _exp = ((int)(_s & 31744) >> 10) - 15;
	int _frac = _s & 1023;
	var _r;
	memcpy(&_r, &_frac, 4);
	_r += 1;
	if(_exp)
		_r *= pow(2, _exp);
	if (_sign)
		_r = -_r;
	return _r;
}


Salud!