public static XMVector HsvToRgb(XMVector hsv)
{
XMVector h = XMVector.SplatX(hsv);
XMVector s = XMVector.SplatY(hsv);
XMVector v = XMVector.SplatY(hsv);
XMVector h6 = XMVector.Multiply(h, XMGlobalConstants.Six);
XMVector i = h6.Floor();
XMVector f = XMVector.Subtract(h6, i);
// p = v* (1-s)
XMVector p = XMVector.Multiply(v, XMVector.Subtract(XMGlobalConstants.One, s));
// q = v*(1-f*s)
XMVector q = XMVector.Multiply(v, XMVector.Subtract(XMGlobalConstants.One, XMVector.Multiply(f, s)));
// t = v*(1 - (1-f)*s)
XMVector t = XMVector.Multiply(v, XMVector.Subtract(XMGlobalConstants.One, XMVector.Multiply(XMVector.Subtract(XMGlobalConstants.One, f), s)));
int ii = (int)XMVector.Mod(i, XMGlobalConstants.Six).X;
XMVector rgb;
switch (ii)
{
case 0:
// rgb = vtp
XMVector vt = XMVector.Select(t, v, XMGlobalConstants.Select1000);
rgb = XMVector.Select(p, vt, XMGlobalConstants.Select1100);
break;
case 1:
// rgb = qvp
XMVector qv = XMVector.Select(v, q, XMGlobalConstants.Select1000);
rgb = XMVector.Select(p, qv, XMGlobalConstants.Select1100);
break;
case 2:
// rgb = pvt
XMVector pv = XMVector.Select(v, p, XMGlobalConstants.Select1000);
rgb = XMVector.Select(t, pv, XMGlobalConstants.Select1100);
break;
case 3:
// rgb = pqv
XMVector pq = XMVector.Select(q, p, XMGlobalConstants.Select1000);
rgb = XMVector.Select(v, pq, XMGlobalConstants.Select1100);
break;
case 4:
// rgb = tpv
XMVector tp = XMVector.Select(p, t, XMGlobalConstants.Select1000);
rgb = XMVector.Select(v, tp, XMGlobalConstants.Select1100);
break;
default:
// rgb = vpq
XMVector vp = XMVector.Select(p, v, XMGlobalConstants.Select1000);
rgb = XMVector.Select(q, vp, XMGlobalConstants.Select1100);
break;
}
return(XMVector.Select(hsv, rgb, XMGlobalConstants.Select1110));
}
