GLGETCONVOLUTIONPARAMETER(3G)

NAME
glGetConvolutionParameterfv, glGetConvolutionParameteriv - get convolution parameters

C SPECIFICATION
void glGetConvolutionParameterfv( GLenum target,
	GLenum pname,
	GLfloat *params )
void glGetConvolutionParameteriv( GLenum target,
	GLenum pname,
	GLint *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
glGetConvolutionParameter 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 glConvolutionParameter 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 . See glConvolutionFilter1D, glConvolutionFilter2D, and glSeparableFilter2D 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 glGetConvolutionParameter is executed between the execution of glBegin and the corresponding execution of glEnd.

SEE ALSO
glGetConvolutionFilter(3G), glGetSeparableFilter2D(3G), glConvolutionParameter(3G)