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| 1452 | chris | 1 | <?xml version="1.0" encoding="UTF-8"?> |
| 2 | <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN" |
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| 3 | "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd"> |
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| 4 | <refentry id="glGetConvolutionParameter"> |
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| 5 | <refmeta> |
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| 6 | <refmetainfo> |
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| 7 | <copyright> |
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| 8 | <year>1991-2006</year> |
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| 9 | <holder>Silicon Graphics, Inc.</holder> |
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| 10 | </copyright> |
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| 11 | </refmetainfo> |
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| 12 | <refentrytitle>glGetConvolutionParameter</refentrytitle> |
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| 13 | <manvolnum>3G</manvolnum> |
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| 14 | </refmeta> |
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| 15 | <refnamediv> |
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| 16 | <refname>glGetConvolutionParameter</refname> |
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| 17 | <refpurpose>get convolution parameters</refpurpose> |
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| 18 | </refnamediv> |
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| 19 | <refsynopsisdiv><title>C Specification</title> |
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| 20 | <funcsynopsis> |
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| 21 | <funcprototype> |
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| 22 | <funcdef>void <function>glGetConvolutionParameterfv</function></funcdef> |
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| 23 | <paramdef>GLenum <parameter>target</parameter></paramdef> |
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| 24 | <paramdef>GLenum <parameter>pname</parameter></paramdef> |
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| 25 | <paramdef>GLfloat * <parameter>params</parameter></paramdef> |
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| 26 | </funcprototype> |
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| 27 | </funcsynopsis> |
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| 28 | <funcsynopsis> |
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| 29 | <funcprototype> |
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| 30 | <funcdef>void <function>glGetConvolutionParameteriv</function></funcdef> |
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| 31 | <paramdef>GLenum <parameter>target</parameter></paramdef> |
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| 32 | <paramdef>GLenum <parameter>pname</parameter></paramdef> |
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| 33 | <paramdef>GLint * <parameter>params</parameter></paramdef> |
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| 34 | </funcprototype> |
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| 35 | </funcsynopsis> |
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| 36 | </refsynopsisdiv> |
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| 37 | <refsect1 id="parameters"><title>Parameters</title> |
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| 38 | <variablelist> |
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| 39 | <varlistentry> |
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| 40 | <term><parameter>target</parameter></term> |
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| 41 | <listitem> |
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| 42 | <para> |
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| 43 | The filter whose parameters are to be retrieved. |
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| 44 | Must be one of |
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| 45 | <constant>GL_CONVOLUTION_1D</constant>, |
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| 46 | <constant>GL_CONVOLUTION_2D</constant>, or |
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| 47 | <constant>GL_SEPARABLE_2D</constant>. |
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| 48 | </para> |
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| 49 | </listitem> |
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| 50 | </varlistentry> |
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| 51 | <varlistentry> |
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| 52 | <term><parameter>pname</parameter></term> |
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| 53 | <listitem> |
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| 54 | <para> |
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| 55 | The parameter to be retrieved. |
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| 56 | Must be one of |
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| 57 | <constant>GL_CONVOLUTION_BORDER_MODE</constant>, |
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| 58 | <constant>GL_CONVOLUTION_BORDER_COLOR</constant>, |
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| 59 | <constant>GL_CONVOLUTION_FILTER_SCALE</constant>, |
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| 60 | <constant>GL_CONVOLUTION_FILTER_BIAS</constant>, |
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| 61 | <constant>GL_CONVOLUTION_FORMAT</constant>, |
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| 62 | <constant>GL_CONVOLUTION_WIDTH</constant>, |
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| 63 | <constant>GL_CONVOLUTION_HEIGHT</constant>, |
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| 64 | <constant>GL_MAX_CONVOLUTION_WIDTH</constant>, or |
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| 65 | <constant>GL_MAX_CONVOLUTION_HEIGHT</constant>. |
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| 66 | </para> |
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| 67 | </listitem> |
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| 68 | </varlistentry> |
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| 69 | <varlistentry> |
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| 70 | <term><parameter>params</parameter></term> |
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| 71 | <listitem> |
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| 72 | <para> |
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| 73 | Pointer to storage for the parameters to be retrieved. |
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| 74 | </para> |
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| 75 | </listitem> |
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| 76 | </varlistentry> |
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| 77 | </variablelist> |
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| 78 | </refsect1> |
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| 79 | <refsect1 id="description"><title>Description</title> |
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| 80 | <para> |
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| 81 | <function>glGetConvolutionParameter</function> retrieves convolution parameters. |
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| 82 | <parameter>target</parameter> determines which convolution filter is queried. |
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| 83 | <parameter>pname</parameter> determines which parameter is returned: |
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| 84 | </para> |
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| 85 | <variablelist> |
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| 86 | <varlistentry> |
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| 87 | <term><constant>GL_CONVOLUTION_BORDER_MODE</constant></term> |
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| 88 | <listitem> |
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| 89 | <para> |
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| 90 | </para> |
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| 91 | <para> |
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| 92 | The convolution border mode. |
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| 93 | See <citerefentry><refentrytitle>glConvolutionParameter</refentrytitle></citerefentry> for a list of border modes. |
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| 94 | </para> |
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| 95 | </listitem> |
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| 96 | </varlistentry> |
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| 97 | <varlistentry> |
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| 98 | <term><constant>GL_CONVOLUTION_BORDER_COLOR</constant></term> |
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| 99 | <listitem> |
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| 100 | <para> |
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| 101 | </para> |
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| 102 | <para> |
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| 103 | The current convolution border color. |
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| 104 | <parameter>params</parameter> must be a pointer to an array of four elements, |
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| 105 | which will receive the red, green, blue, and alpha border colors. |
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| 106 | </para> |
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| 107 | </listitem> |
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| 108 | </varlistentry> |
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| 109 | <varlistentry> |
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| 110 | <term><constant>GL_CONVOLUTION_FILTER_SCALE</constant></term> |
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| 111 | <listitem> |
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| 112 | <para> |
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| 113 | </para> |
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| 114 | <para> |
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| 115 | The current filter scale factors. |
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| 116 | <parameter>params</parameter> must be a pointer to an array of four elements, |
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| 117 | which will receive the red, green, blue, and alpha filter scale |
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| 118 | factors in that order. |
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| 119 | </para> |
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| 120 | </listitem> |
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| 121 | </varlistentry> |
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| 122 | <varlistentry> |
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| 123 | <term><constant>GL_CONVOLUTION_FILTER_BIAS</constant></term> |
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| 124 | <listitem> |
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| 125 | <para> |
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| 126 | </para> |
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| 127 | <para> |
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| 128 | The current filter bias factors. |
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| 129 | <parameter>params</parameter> must be a pointer to an array of four elements, |
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| 130 | which will receive the red, green, blue, and alpha filter bias |
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| 131 | terms in that order. |
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| 132 | </para> |
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| 133 | </listitem> |
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| 134 | </varlistentry> |
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| 135 | <varlistentry> |
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| 136 | <term><constant>GL_CONVOLUTION_FORMAT</constant></term> |
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| 137 | <listitem> |
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| 138 | <para> |
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| 139 | </para> |
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| 140 | <para> |
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| 141 | The current internal format. |
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| 142 | See <citerefentry><refentrytitle>glConvolutionFilter1D</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glConvolutionFilter2D</refentrytitle></citerefentry>, |
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| 143 | and <citerefentry><refentrytitle>glSeparableFilter2D</refentrytitle></citerefentry> for lists of allowable |
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| 144 | formats. |
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| 145 | </para> |
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| 146 | </listitem> |
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| 147 | </varlistentry> |
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| 148 | <varlistentry> |
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| 149 | <term><constant>GL_CONVOLUTION_WIDTH</constant></term> |
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| 150 | <listitem> |
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| 151 | <para> |
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| 152 | </para> |
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| 153 | <para> |
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| 154 | The current filter image width. |
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| 155 | </para> |
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| 156 | </listitem> |
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| 157 | </varlistentry> |
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| 158 | <varlistentry> |
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| 159 | <term><constant>GL_CONVOLUTION_HEIGHT</constant></term> |
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| 160 | <listitem> |
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| 161 | <para> |
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| 162 | </para> |
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| 163 | <para> |
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| 164 | The current filter image height. |
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| 165 | </para> |
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| 166 | </listitem> |
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| 167 | </varlistentry> |
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| 168 | <varlistentry> |
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| 169 | <term><constant>GL_MAX_CONVOLUTION_WIDTH</constant></term> |
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| 170 | <listitem> |
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| 171 | <para> |
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| 172 | </para> |
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| 173 | <para> |
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| 174 | The maximum acceptable filter image width. |
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| 175 | </para> |
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| 176 | </listitem> |
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| 177 | </varlistentry> |
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| 178 | <varlistentry> |
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| 179 | <term><constant>GL_MAX_CONVOLUTION_HEIGHT</constant></term> |
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| 180 | <listitem> |
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| 181 | <para> |
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| 182 | </para> |
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| 183 | <para> |
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| 184 | The maximum acceptable filter image height. |
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| 185 | </para> |
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| 186 | </listitem> |
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| 187 | </varlistentry> |
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| 188 | </variablelist> |
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| 189 | </refsect1> |
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| 190 | <refsect1 id="errors"><title>Errors</title> |
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| 191 | <para> |
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| 192 | <constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not one of the allowable |
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| 193 | values. |
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| 194 | </para> |
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| 195 | <para> |
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| 196 | <constant>GL_INVALID_ENUM</constant> is generated if <parameter>pname</parameter> is not one of the allowable |
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| 197 | values. |
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| 198 | </para> |
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| 199 | <para> |
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| 200 | <constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is <constant>GL_CONVOLUTION_1D</constant> |
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| 201 | and <parameter>pname</parameter> is <constant>GL_CONVOLUTION_HEIGHT</constant> or |
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| 202 | <constant>GL_MAX_CONVOLUTION_HEIGHT</constant>. |
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| 203 | </para> |
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| 204 | <para> |
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| 205 | <constant>GL_INVALID_OPERATION</constant> is generated if <function>glGetConvolutionParameter</function> is executed |
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| 206 | between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding |
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| 207 | execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>. |
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| 208 | </para> |
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| 209 | </refsect1> |
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| 210 | <refsect1 id="seealso"><title>See Also</title> |
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| 211 | <para> |
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| 212 | <citerefentry><refentrytitle>glGetConvolutionFilter</refentrytitle></citerefentry>, |
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| 213 | <citerefentry><refentrytitle>glGetSeparableFilter</refentrytitle></citerefentry>, |
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| 214 | <citerefentry><refentrytitle>glConvolutionParameter</refentrytitle></citerefentry> |
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| 215 | </para> |
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| 216 | </refsect1> |
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| 217 | <refsect1 id="Copyright"><title>Copyright</title> |
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| 218 | <para> |
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| 219 | Copyright <trademark class="copyright"></trademark> 1991-2006 |
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| 220 | Silicon Graphics, Inc. This document is licensed under the SGI |
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| 221 | Free Software B License. For details, see |
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| 222 | <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>. |
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| 223 | </para> |
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| 224 | </refsect1> |
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| 225 | </refentry> |