fglGetConvolutionParameter(3G) OpenGL Reference
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.
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fglGetConvolutionParameter(3G) OpenGL Reference
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
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