// Can be used to efficiently encode floating point values from a limited range ([0..65k]) into a byte
// edgeDecode is optimized for GPUs (native exp2)
// edgeEncode1 is optimized for GPUs (native log2)
// edgeEncode2 is optimized for CPUs
float edgeDecode(int e)
{
	return pow(2.0f, float(e) / 16) - 1;
}

int edgeEncode1(float f)
{
	return log2f(f + 1) * 16 + 0.5f;
}

int edgeEncode2(float f)
{
	// This is an approximation of log2(f + 1) * 16 + 0.5
	// Instead of computing log2 precisely, we compute integer part by taking the floating point exponent
	// and take the fractional part as is (rounded); we can refine it with a table lookup but the precision we get
	// after reconstruction is reasonable as it is
	union { float f; unsigned ui; } u;
	u.f = f + 1;
	unsigned v = u.ui;

	return (v - (127 << 23) + (1 << 18)) >> 19;
}