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GLGETSEPARABLEFILTER(3G)                                                            GLGETSEPARABLEFILTER(3G)



NAME
       glGetSeparableFilter - get separable convolution filter kernel images


C SPECIFICATION
       void glGetSeparableFilter( GLenum target,
                                  GLenum format,
                                  GLenum type,
                                  GLvoid *row,
                                  GLvoid *column,
                                  GLvoid *span )


PARAMETERS
       target  The separable filter to be retrieved.  Must be GL_SEPARABLE_2D.

       format  Format  of  the  output  images.  Must be one of GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA, GL_RGB,
               GL_BGR GL_RGBA, GL_BGRA, GL_LUMINANCE, or GL_LUMINANCE_ALPHA.

       type    Data type of components in the output images.  Symbolic constants GL_UNSIGNED_BYTE,  GL_BYTE,
               GL_BITMAP,     GL_UNSIGNED_SHORT,     GL_SHORT,     GL_UNSIGNED_INT,     GL_INT,    GL_FLOAT,
               GL_UNSIGNED_BYTE_3_3_2,         GL_UNSIGNED_BYTE_2_3_3_REV,          GL_UNSIGNED_SHORT_5_6_5,
               GL_UNSIGNED_SHORT_5_6_5_REV,     GL_UNSIGNED_SHORT_4_4_4_4,    GL_UNSIGNED_SHORT_4_4_4_4_REV,
               GL_UNSIGNED_SHORT_5_5_5_1,      GL_UNSIGNED_SHORT_1_5_5_5_REV,       GL_UNSIGNED_INT_8_8_8_8,
               GL_UNSIGNED_INT_8_8_8_8_REV,  GL_UNSIGNED_INT_10_10_10_2,  and GL_UNSIGNED_INT_2_10_10_10_REV
               are accepted.

       row     Pointer to storage for the row filter image.

       column  Pointer to storage for the column filter image.

       span    Pointer to storage for the span filter image (currently unused).

DESCRIPTION
       glGetSeparableFilter returns the two one-dimensional filter kernel images for the  current  separable
       2D  convolution  filter.   The  row  image  is placed in row and the column image is placed in column
       according to the specifications in format and type.  (In the  current  implementation,  span  is  not
       affected  in  any  way.)   No pixel transfer operations are performed on the images, but the relevant
       pixel storage modes are applied.

       Color components that are present in format but not included in the  internal   of  the  filters  are
       returned  as  zero.   The assignments of internal color components to the components of format are as
       follows:


        Internal Component     Resulting Component
        Red                    Red
        Green                  Green
        Blue                   Blue
        Alpha                  Alpha
        Luminance              Red
        Intensity              Red


NOTES
       glGetSeparableFilter is present only if GL_ARB_imaging is returned when glGetString is called with an
       argument of GL_EXTENSIONS.

       Non-separable 2D filters must be retrieved with glGetConvolutionFilter.

ERRORS
       GL_INVALID_ENUM is generated if target is not GL_SEPARABLE_2D.

       GL_INVALID_ENUM is generated if format is not one of the allowable values.

       GL_INVALID_ENUM is generated if type is not one of the allowable values.

       GL_INVALID_OPERATION  is  generated  if  glGetSeparableFilter  is  executed  between the execution of
       glBegin and the corresponding execution of glEnd.

       GL_INVALID_OPERATION    is    generated    if    type    is    one     of     GL_UNSIGNED_BYTE_3_3_2,
       GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_SHORT_5_6_5, or GL_UNSIGNED_SHORT_5_6_5_REV and format is not
       GL_RGB.

       GL_INVALID_OPERATION   is    generated    if    type    is    one    of    GL_UNSIGNED_SHORT_4_4_4_4,
       GL_UNSIGNED_SHORT_4_4_4_4_REV,        GL_UNSIGNED_SHORT_5_5_5_1,       GL_UNSIGNED_SHORT_1_5_5_5_REV,
       GL_UNSIGNED_INT_8_8_8_8,      GL_UNSIGNED_INT_8_8_8_8_REV,       GL_UNSIGNED_INT_10_10_10_2,       or
       GL_UNSIGNED_INT_2_10_10_10_REV and format is neither GL_RGBA nor GL_BGRA.

ASSOCIATED GETS
       glGetConvolutionParameter

SEE ALSO
       glGetConvolutionFilter(3G), glConvolutionParameter(3G), glSeparableFilter2D(3G)




                                                                                    GLGETSEPARABLEFILTER(3G)