public static XMVector Orthogonal(XMVector v)
{
XMVector zero = XMVector.Zero;
XMVector z = XMVector.SplatZ(v);
XMVector yzyy = new XMVector(v.Y, v.Z, v.Y, v.Y);
XMVector negativeV = XMVector.Subtract(zero, v);
XMVector z_isNegative = XMVector.Less(z, zero);
XMVector yzyyIsNegative = XMVector.Less(yzyy, zero);
XMVector s = XMVector.Add(yzyy, z);
XMVector d = XMVector.Subtract(yzyy, z);
XMVector select = XMVector.EqualInt(z_isNegative, yzyyIsNegative);
XMVector r0 = new XMVector(s.X, negativeV.X, negativeV.X, negativeV.X);
XMVector r1 = new XMVector(d.X, v.X, v.X, v.X);
return(XMVector.Select(r1, r0, select));
}
public static XMVector ClampLengthV(XMVector v, XMVector lengthMin, XMVector lengthMax)
{
Debug.Assert(lengthMin.Y == lengthMin.X && lengthMin.Z == lengthMin.X && lengthMin.W == lengthMin.X, "Reviewed");
Debug.Assert(lengthMax.Y == lengthMax.X && lengthMax.Z == lengthMax.X && lengthMax.W == lengthMax.X, "Reviewed");
Debug.Assert(XMVector4.GreaterOrEqual(lengthMin, XMGlobalConstants.Zero), "Reviewed");
Debug.Assert(XMVector4.GreaterOrEqual(lengthMax, XMGlobalConstants.Zero), "Reviewed");
Debug.Assert(XMVector4.GreaterOrEqual(lengthMax, lengthMin), "Reviewed");
XMVector lengthSq = XMVector4.LengthSquare(v);
XMVector zero = XMVector.Zero;
XMVector reciprocalLength = lengthSq.ReciprocalSqrt();
XMVector infiniteLength = XMVector.EqualInt(lengthSq, XMGlobalConstants.Infinity);
XMVector zeroLength = XMVector.Equal(lengthSq, zero);
XMVector normal = XMVector.Multiply(v, reciprocalLength);
XMVector length = XMVector.Multiply(lengthSq, reciprocalLength);
XMVector select = XMVector.EqualInt(infiniteLength, zeroLength);
length = XMVector.Select(lengthSq, length, select);
normal = XMVector.Select(lengthSq, normal, select);
XMVector controlMax = XMVector.Greater(length, lengthMax);
XMVector controlMin = XMVector.Less(length, lengthMin);
XMVector clampLength = XMVector.Select(length, lengthMax, controlMax);
clampLength = XMVector.Select(clampLength, lengthMin, controlMin);
XMVector result = XMVector.Multiply(normal, clampLength);
// Preserve the original vector (with no precision loss) if the length falls within the given range
XMVector control = XMVector.EqualInt(controlMax, controlMin);
result = XMVector.Select(result, v, control);
return(result);
}
