| DirectX SDK | 
The CONST_D3DTEXTUREMIPFILTER enumeration defines texture mipmap filtering modes for a texture stage.
Enum CONST_D3DTEXTUREMIPFILTER
    D3DTFP_NONE         = 1  
    D3DTFP_POINT        = 2  
    D3DTFP_LINEAR       = 3  
End Enum
You set a texture stage's magnification filter by calling the Direct3DDevice7.SetTextureStageState method with the D3DTSS_MIPFILTER value as the second parameter, and one of constants of this enumeration as the third parameter.
CONST_D3DTEXTUREMAGFILTER, CONST_D3DTEXTUREMIPFILTER, Texture Filtering