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162 lines
8.5 KiB
XML
162 lines
8.5 KiB
XML
<?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="glGetTransformFeedbackVarying">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>2010</year>
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<holder>Khronos Group</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glGetTransformFeedbackVarying</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetTransformFeedbackVarying</refname>
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<refpurpose>retrieve information about varying variables selected for transform feedback</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>glGetTransformFeedbackVarying</function></funcdef>
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<paramdef>GLuint<parameter>program</parameter></paramdef>
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<paramdef>GLuint<parameter>index</parameter></paramdef>
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<paramdef>GLsizei<parameter>bufSize</parameter></paramdef>
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<paramdef>GLsizei *<parameter>length</parameter></paramdef>
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<paramdef>GLsizei<parameter>size</parameter></paramdef>
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<paramdef>GLenum *<parameter>type</parameter></paramdef>
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<paramdef>char *<parameter>name</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>program</parameter></term>
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<listitem>
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<para>
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The name of the target program object.
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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>index</parameter></term>
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<listitem>
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<para>
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The index of the varying variable whose information to retrieve.
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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>bufSize</parameter></term>
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<listitem>
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<para>
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The maximum number of characters, including the null terminator, that may be written into <parameter>name</parameter>.
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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>length</parameter></term>
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<listitem>
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<para>
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The address of a variable which will receive the number of characters written into <parameter>name</parameter>,
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excluding the null-terminator. If <parameter>length</parameter> is <constant>NULL</constant> no length is returned.
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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>size</parameter></term>
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<listitem>
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<para>
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The address of a variable that will receive the size of the varying.
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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>type</parameter></term>
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<listitem>
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<para>
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The address of a variable that will recieve the type of the varying.
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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>name</parameter></term>
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<listitem>
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<para>
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The address of a buffer into which will be written the name of the varying.
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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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Information about the set of varying variables in a linked program that will be captured
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during transform feedback may be retrieved by calling <function>glGetTransformFeedbackVarying</function>.
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<function>glGetTransformFeedbackVarying</function> provides information about the varying
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variable selected by <parameter>index</parameter>. An <parameter>index</parameter> of 0 selects
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the first varying variable specified in the <parameter>varyings</parameter> array passed
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to <citerefentry><refentrytitle>glTransformFeedbackVaryings</refentrytitle></citerefentry>, and
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an <parameter>index</parameter> of <constant>GL_TRANSFORM_FEEDBACK_VARYINGS-1</constant> selects
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the last such variable.
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</para>
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<para>
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The name of the selected varying is returned as a null-terminated string in
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<parameter>name</parameter>. The actual number of characters written into <parameter>name</parameter>,
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excluding the null terminator, is returned in <parameter>length</parameter>. If <parameter>length</parameter>
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is NULL, no length is returned. The maximum number of characters that may be written into <parameter>name</parameter>,
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including the null terminator, is specified by <parameter>bufSize</parameter>.
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</para>
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<para>
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The length of the longest varying name in program is given by <constant>GL_TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH</constant>,
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which can be queried with <citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>.
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</para>
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<para>
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For the selected varying variable, its type is returned into <parameter>type</parameter>. The size of
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the varying is returned into <parameter>size</parameter>. The value in <parameter>size</parameter> is
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in units of the type returned in <parameter>type</parameter>. The type returned can be any of the
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scalar, vector, or matrix attribute types returned by <citerefentry><refentrytitle>glGetActiveAttrib</refentrytitle></citerefentry>.
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If an error occurred, the return parameters <parameter>length</parameter>, <parameter>size</parameter>,
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<parameter>type</parameter> and <parameter>name</parameter> will be unmodified. This command will return as much
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information about the varying variables as possible. If no information is available, <parameter>length</parameter>
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will be set to zero and <parameter>name</parameter> will be an empty string. This situation could
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arise if <function>glGetTransformFeedbackVarying</function> is called after a failed link.
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</para>
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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_VALUE</constant> is generated if <parameter>program</parameter> is not
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the name of a program object.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>index</parameter> is greater or equal to
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the value of <constant>GL_TRANSFORM_FEEDBACK_VARYINGS</constant>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated <parameter>program</parameter> has not been linked.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry> with argument <constant>GL_TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH</constant>.
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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>glBeginTransformFeedback</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glEndTransformFeedback</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTransformFeedbackVaryings</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>
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</para>
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</refsect1> <refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 2010 Khronos Group.
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This material may be distributed subject to the terms and conditions set forth in
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the Open Publication License, v 1.0, 8 June 1999.
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<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
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</para>
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</refsect1>
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</refentry>
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