115 lines
3.4 KiB
Plaintext
115 lines
3.4 KiB
Plaintext
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'\" t
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'\"! tbl | mmdoc
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'\"macro stdmacro
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.ds Vn Version 1.2
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.ds Dt 24 September 1999
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.ds Re Release 1.2.1
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.ds Dp Jan 14 18:30
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.ds Dm 001 getconvo
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.ds Xs 10201 5 getconvolutionparameter.gl
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.TH GLGETCONVOLUTIONPARAMETER 3G
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.SH NAME
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.B "glGetConvolutionParameterfv, glGetConvolutionParameteriv
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\- get convolution parameters
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.SH C SPECIFICATION
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void \f3glGetConvolutionParameterfv\fP(
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GLenum \fItarget\fP,
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.nf
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.ta \w'\f3void \fPglGetConvolutionParameterfv( 'u
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GLenum \fIpname\fP,
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GLfloat \fI*params\fP )
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.fi
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void \f3glGetConvolutionParameteriv\fP(
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GLenum \fItarget\fP,
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.nf
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.ta \w'\f3void \fPglGetConvolutionParameteriv( 'u
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GLenum \fIpname\fP,
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GLint \fI*params\fP )
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.fi
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.SH PARAMETERS
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.TP \w'\f2target\fP\ \ 'u
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\f2target\fP
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The filter whose parameters are to be retrieved.
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Must be one of
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\%\f3GL_CONVOLUTION_1D\fP,
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\%\f3GL_CONVOLUTION_2D\fP, or
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\%\f3GL_SEPARABLE_2D\fP.
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.TP
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\f2pname\fP
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The parameter to be retrieved.
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Must be one of
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\%\f3GL_CONVOLUTION_BORDER_MODE\fP,
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\%\f3GL_CONVOLUTION_BORDER_COLOR\fP,
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\%\f3GL_CONVOLUTION_FILTER_SCALE\fP,
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\%\f3GL_CONVOLUTION_FILTER_BIAS\fP,
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\%\f3GL_CONVOLUTION_FORMAT\fP,
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\%\f3GL_CONVOLUTION_WIDTH\fP,
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\%\f3GL_CONVOLUTION_HEIGHT\fP,
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\%\f3GL_MAX_CONVOLUTION_WIDTH\fP, or
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\%\f3GL_MAX_CONVOLUTION_HEIGHT\fP.
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.TP
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\f2params\fP
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Pointer to storage for the parameters to be retrieved.
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.SH DESCRIPTION
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\%\f3glGetConvolutionParameter\fP retrieves convolution parameters.
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\f2target\fP determines which convolution filter is queried.
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\f2pname\fP determines which parameter is returned:
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.TP
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\%\f3GL_CONVOLUTION_BORDER_MODE\fP
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The convolution border mode.
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See \%\f3glConvolutionParameter\fP for a list of border modes.
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.TP
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\%\f3GL_CONVOLUTION_BORDER_COLOR\fP
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The current convolution border color.
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\f2params\fP must be a pointer to an array of four elements,
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which will receive the red, green, blue, and alpha border colors.
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.TP
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\%\f3GL_CONVOLUTION_FILTER_SCALE\fP
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The current filter scale factors.
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\f2params\fP must be a pointer to an array of four elements,
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which will receive the red, green, blue, and alpha filter scale
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factors in that order.
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.TP
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\%\f3GL_CONVOLUTION_FILTER_BIAS\fP
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The current filter bias factors.
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\f2params\fP must be a pointer to an array of four elements,
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which will receive the red, green, blue, and alpha filter bias
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terms in that order.
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.TP
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\%\f3GL_CONVOLUTION_FORMAT\fP
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The current internal .
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See \%\f3glConvolutionFilter1D\fP, \%\f3glConvolutionFilter2D\fP,
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and \%\f3glSeparableFilter2D\fP for lists of allowable formats.
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.TP
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\%\f3GL_CONVOLUTION_WIDTH\fP
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The current filter image width.
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.TP
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\%\f3GL_CONVOLUTION_HEIGHT\fP
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The current filter image height.
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.TP
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\%\f3GL_MAX_CONVOLUTION_WIDTH\fP
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The maximum acceptable filter image width.
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.TP
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\%\f3GL_MAX_CONVOLUTION_HEIGHT\fP
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The maximum acceptable filter image height.
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.SH ERRORS
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\%\f3GL_INVALID_ENUM\fP is generated if \f2target\fP is not one of the allowable
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values.
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.P
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\%\f3GL_INVALID_ENUM\fP is generated if \f2pname\fP is not one of the allowable
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values.
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.P
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\%\f3GL_INVALID_ENUM\fP is generated if \f2target\fP is \%\f3GL_CONVOLUTION_1D\fP
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and \f2pname\fP is \%\f3GL_CONVOLUTION_HEIGHT\fP or
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\%\f3GL_MAX_CONVOLUTION_HEIGHT\fP.
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.P
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\%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glGetConvolutionParameter\fP is executed
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between the execution of \%\f3glBegin\fP and the corresponding
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execution of \%\f3glEnd\fP.
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.SH SEE ALSO
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\%\f3glGetConvolutionFilter(3G)\fP,
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\%\f3glGetSeparableFilter2D(3G)\fP,
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\%\f3glConvolutionParameter(3G)\fP
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