fglGetConvolutionParameter(3G)

NAME
     fglGetConvolutionParameterfv, fglGetConvolutionParameteriv - get
     convolution parameters


FORTRAN SPECIFICATION
     SUBROUTINE fglGetConvolutionParameterfv( INTEGER*4 target,
                                              INTEGER*4 pname,
                                              CHARACTER*8 params )
     SUBROUTINE fglGetConvolutionParameteriv( INTEGER*4 target,
                                              INTEGER*4 pname,
                                              CHARACTER*8 params )


PARAMETERS
     target  The filter whose parameters are to be retrieved.  Must be one of
             GL_CONVOLUTION_1D, GL_CONVOLUTION_2D, or GL_SEPARABLE_2D.

     pname   The parameter to be retrieved.  Must be one of
             GL_CONVOLUTION_BORDER_MODE, GL_CONVOLUTION_BORDER_COLOR,
             GL_CONVOLUTION_FILTER_SCALE, GL_CONVOLUTION_FILTER_BIAS,
             GL_CONVOLUTION_FORMAT, GL_CONVOLUTION_WIDTH,
             GL_CONVOLUTION_HEIGHT, GL_MAX_CONVOLUTION_WIDTH, or
             GL_MAX_CONVOLUTION_HEIGHT.

     params  Pointer to storage for the parameters to be retrieved.

DESCRIPTION
     fglGetConvolutionParameter retrieves convolution parameters.  target
     determines which convolution filter is queried.  pname determines which
     parameter is returned:

     GL_CONVOLUTION_BORDER_MODE
          The convolution border mode.  See fglConvolutionParameter for a list
          of border modes.

     GL_CONVOLUTION_BORDER_COLOR
          The current convolution border color.  params must be a pointer to
          an array of four elements, which will receive the red, green, blue,
          and alpha border colors.

     GL_CONVOLUTION_FILTER_SCALE
          The current filter scale factors.  params must be a pointer to an
          array of four elements, which will receive the red, green, blue, and
          alpha filter scale factors in that order.

     GL_CONVOLUTION_FILTER_BIAS
          The current filter bias factors.  params must be a pointer to an
          array of four elements, which will receive the red, green, blue, and
          alpha filter bias terms in that order.
     GL_CONVOLUTION_FORMAT
          The current internal format.  See fglConvolutionFilter1D,
          fglConvolutionFilter2D, and fglSeparableFilter2D for lists of
          allowable formats.

     GL_CONVOLUTION_WIDTH
          The current filter image width.

     GL_CONVOLUTION_HEIGHT
          The current filter image height.

     GL_MAX_CONVOLUTION_WIDTH
          The maximum acceptable filter image width.

     GL_MAX_CONVOLUTION_HEIGHT
          The maximum acceptable filter image height.

ERRORS
     GL_INVALID_ENUM is generated if target is not one of the allowable
     values.

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

     GL_INVALID_ENUM is generated if target is GL_CONVOLUTION_1D and pname is
     GL_CONVOLUTION_HEIGHT or GL_MAX_CONVOLUTION_HEIGHT.

     GL_INVALID_OPERATION is generated if fglGetConvolutionParameter is
     executed between the execution of fglBegin and the corresponding
     execution of fglEnd.


MACHINE DEPENDENCIES
     RealityEngine, RealityEngine2, and VTX systems cannot retrieve
     GL_MAX_CONVOLUTION_WIDTH_EXT or GL_MAX_CONVOLUTION_HEIGHT_EXT.


SEE ALSO
     fglGetConvolutionFilter, fglGetSeparableFilter2D, fglConvolutionParameter