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