The definition of the internal DirectX D3DCOLORVALUE object is as follows:

struct D3DCOLORVALUE {
union {
D3DVALUE r;
D3DVALUE dvR;
};
union {
D3DVALUE g;
D3DVALUE dvG;
};
union {
D3DVALUE b;
D3DVALUE dvB;
};
union {
D3DVALUE a;
D3DVALUE dvA;
};
};