Question

I am using DirectXMath.h where all multiplications and operations are done with XMVECTOR(a SIMD wrapper) and for storage is used XMFLOAT3 which contains 3 floats.However in this specific piece of code I really need to add a * operator for XMFLOAT3(for both XMFLOAT3*XMFLOAT3 and XMFLOAT3*float).Can I do that?Or must I tamper with the DirectXMath headers in the SDK?

Answer 1

Go right ahead, just define operator*:

XMFLOAT3 operator*(XMFLOAT3 l, XMFLOAT3 r) {
    XMVECTOR lvec(XMLoadFloat3(&l));
    XMVECTOR rvec(XMLoadFloat3(&r));
    //Perform operations
}

XMFLOAT3 operator*(XMFLOAT3 l, float r) {
    XMVECTOR lvec(XMLoadFloat3(&l));
    //Perform operations
}

XMFLOAT3 operator*(float l, XMFLOAT3 r) {
    XMVECTOR rvec(XMLoadFloat3(&r));
    //Perform operations
}