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glGetConvolutionParameter.xml
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glGetConvolutionParameter.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
<refentry id="glGetConvolutionParameter">
<refmeta>
<refmetainfo>
<copyright>
<year>1991-2006</year>
<holder>Silicon Graphics, Inc.</holder>
</copyright>
</refmetainfo>
<refentrytitle>glGetConvolutionParameter</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glGetConvolutionParameter</refname>
<refpurpose>get convolution parameters</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glGetConvolutionParameterfv</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLfloat * <parameter>params</parameter></paramdef>
</funcprototype>
</funcsynopsis>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glGetConvolutionParameteriv</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLint * <parameter>params</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>target</parameter></term>
<listitem>
<para>
The filter whose parameters are to be retrieved.
Must be one of
<constant>GL_CONVOLUTION_1D</constant>,
<constant>GL_CONVOLUTION_2D</constant>, or
<constant>GL_SEPARABLE_2D</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>pname</parameter></term>
<listitem>
<para>
The parameter to be retrieved.
Must be one of
<constant>GL_CONVOLUTION_BORDER_MODE</constant>,
<constant>GL_CONVOLUTION_BORDER_COLOR</constant>,
<constant>GL_CONVOLUTION_FILTER_SCALE</constant>,
<constant>GL_CONVOLUTION_FILTER_BIAS</constant>,
<constant>GL_CONVOLUTION_FORMAT</constant>,
<constant>GL_CONVOLUTION_WIDTH</constant>,
<constant>GL_CONVOLUTION_HEIGHT</constant>,
<constant>GL_MAX_CONVOLUTION_WIDTH</constant>, or
<constant>GL_MAX_CONVOLUTION_HEIGHT</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>params</parameter></term>
<listitem>
<para>
Pointer to storage for the parameters to be retrieved.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="description"><title>Description</title>
<para>
<function>glGetConvolutionParameter</function> retrieves convolution parameters.
<parameter>target</parameter> determines which convolution filter is queried.
<parameter>pname</parameter> determines which parameter is returned:
</para>
<variablelist>
<varlistentry>
<term><constant>GL_CONVOLUTION_BORDER_MODE</constant></term>
<listitem>
<para>
</para>
<para>
The convolution border mode.
See <citerefentry><refentrytitle>glConvolutionParameter</refentrytitle></citerefentry> for a list of border modes.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_CONVOLUTION_BORDER_COLOR</constant></term>
<listitem>
<para>
</para>
<para>
The current convolution border color.
<parameter>params</parameter> must be a pointer to an array of four elements,
which will receive the red, green, blue, and alpha border colors.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_CONVOLUTION_FILTER_SCALE</constant></term>
<listitem>
<para>
</para>
<para>
The current filter scale factors.
<parameter>params</parameter> 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.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_CONVOLUTION_FILTER_BIAS</constant></term>
<listitem>
<para>
</para>
<para>
The current filter bias factors.
<parameter>params</parameter> 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.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_CONVOLUTION_FORMAT</constant></term>
<listitem>
<para>
</para>
<para>
The current internal format.
See <citerefentry><refentrytitle>glConvolutionFilter1D</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glConvolutionFilter2D</refentrytitle></citerefentry>,
and <citerefentry><refentrytitle>glSeparableFilter2D</refentrytitle></citerefentry> for lists of allowable
formats.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_CONVOLUTION_WIDTH</constant></term>
<listitem>
<para>
</para>
<para>
The current filter image width.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_CONVOLUTION_HEIGHT</constant></term>
<listitem>
<para>
</para>
<para>
The current filter image height.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_MAX_CONVOLUTION_WIDTH</constant></term>
<listitem>
<para>
</para>
<para>
The maximum acceptable filter image width.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_MAX_CONVOLUTION_HEIGHT</constant></term>
<listitem>
<para>
</para>
<para>
The maximum acceptable filter image height.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="errors"><title>Errors</title>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not one of the allowable
values.
</para>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>pname</parameter> is not one of the allowable
values.
</para>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is <constant>GL_CONVOLUTION_1D</constant>
and <parameter>pname</parameter> is <constant>GL_CONVOLUTION_HEIGHT</constant> or
<constant>GL_MAX_CONVOLUTION_HEIGHT</constant>.
</para>
<para>
<constant>GL_INVALID_OPERATION</constant> is generated if <function>glGetConvolutionParameter</function> is executed
between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding
execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
</para>
</refsect1>
<refsect1 id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glGetConvolutionFilter</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetSeparableFilter</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glConvolutionParameter</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"></trademark> 1991-2006
Silicon Graphics, Inc. This document is licensed under the SGI
Free Software B License. For details, see
<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
</para>
</refsect1>
</refentry>