The definition of the internal DirectX D3DMATERIAL7 object is as follows:

struct D3DMATERIAL7 {
union {
D3DCOLORVALUE diffuse;
D3DCOLORVALUE dcvDiffuse;
};
union {
D3DCOLORVALUE ambient;
D3DCOLORVALUE dcvAmbient;
};
union {
D3DCOLORVALUE specular;
D3DCOLORVALUE dcvSpecular;
};
union {
D3DCOLORVALUE emissive;
D3DCOLORVALUE dcvEmissive;
union {
D3DVALUE power;
D3DVALUE dvPower;
};
}