Microsoft DirectX 8.1 (Visual Basic)

CONST_D3DXENUM

Defines miscellaneous Direct3DX flags, including image filters.

Enum CONST_D3DXENUM
    D3DX_FILTER_NONE     =      0
    D3DX_FILTER_POINT    =      1
    D3DX_FILTER_LINEAR   =      2
    D3DX_FILTER_TRIANGLE =      3
    D3DX_FILTER_BOX      =      4
    D3DX_FILTER_MIRROR_U =  65536 (&H10000)
    D3DX_FILTER_MIRROR_V = 131072 (&H20000)
    D3DX_FILTER_MIRROR   = 196608 (&H30000)
    D3DX_FILTER_DITHER   = 524288 (&H80000)
    D3DX_DEFAULT         =     -1 (&HFFFFFFFF)
End Enum

Constants

D3DX_FILTER_NONE: No scaling or filtering will take place. Pixels outside the bounds of the source image are assumed to be transparent black.
D3DX_FILTER_POINT: Each destination pixel is computed by sampling the nearest pixel from the source image.
D3DX_FILTER_LINEAR: Each destination pixel is computed by linearly interpolating between the nearest pixels in the source image. This filter works best when the scale on each axis is less than 2.
D3DX_FILTER_TRIANGLE: Every pixel in the source image contributes equally to the destination image. This is the slowest of the filters.
D3DX_FILTER_BOX: Each pixel is computed by averaging a 2×2(×2) box of pixels from the source image. This filter works only when the dimensions of the destination are half those of the source, as is the case with mipmaps.
D3DX_FILTER_MIRROR_U: Indicates that the pixels off the edge of the texture on the u-axis should be mirrored, not wrapped.
D3DX_FILTER_MIRROR_V: Indicates that the pixels off the edge of the texture on the v-axis should be mirrored, not wrapped.
D3DX_FILTER_MIRROR: Specifying this flag is the same as specifying both the D3DX_FILTER_MIRROR_U and D3DX_FILTER_MIRROR_V flags.
D3DX_FILTER_DITHER
Dither the resulting image using a 4x4 ordered dither algorithm.D3DX_DEFAULT: Predefined value that can be used for a parameter that is an enumerated value or a handle. The documentation indicates wherever D3DX_DEFAULT may be used, and how it will be interpreted in each situation.

Remarks

Each valid filter must contain exactly one of the following flags.

D3DX_FILTER_BOX
D3DX_FILTER_LINEAR
D3DX_FILTER_NONE
D3DX_FILTER_POINT
D3DX_FILTER_TRIANGLE

In addition, you can use the OR operator to specify zero or more of the following optional flags with a valid filter.

D3DX_FILTER_MIRROR
D3DX_FILTER_MIRROR_U
D3DX_FILTER_MIRROR_V

CONST_D3DXENUM

Constants

Remarks

See Also