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96 lines
4.2 KiB
XML
96 lines
4.2 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="glPassThrough">
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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>glPassThrough</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glPassThrough</refname>
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<refpurpose>place a marker in the feedback buffer</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>glPassThrough</function></funcdef>
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<paramdef>GLfloat <parameter>token</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>token</parameter></term>
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<listitem>
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<para>
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Specifies a marker value to be placed in the feedback buffer
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following a <constant>GL_PASS_THROUGH_TOKEN</constant>.
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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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</para>
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<para>
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Feedback is a GL render mode.
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The mode is selected by calling
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<citerefentry><refentrytitle>glRenderMode</refentrytitle></citerefentry> with <constant>GL_FEEDBACK</constant>.
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When the GL is in feedback mode,
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no pixels are produced by rasterization.
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Instead,
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information about primitives that would have been rasterized
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is fed back to the application using the GL.
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See the <citerefentry><refentrytitle>glFeedbackBuffer</refentrytitle></citerefentry> reference page for a description of the
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feedback buffer and the values in it.
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</para>
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<para>
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<function>glPassThrough</function> inserts a user-defined marker in the feedback buffer
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when it is executed in feedback mode.
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<parameter>token</parameter> is returned as if it were a primitive;
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it is indicated with its own unique identifying value:
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<constant>GL_PASS_THROUGH_TOKEN</constant>.
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The order of <function>glPassThrough</function> commands with respect to the specification
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of graphics primitives is maintained.
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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<function>glPassThrough</function> is ignored if the GL is not in feedback mode.
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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_OPERATION</constant> is generated if <function>glPassThrough</function> is executed between
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the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
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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>glGet</refentrytitle></citerefentry> with argument <constant>GL_RENDER_MODE</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>glFeedbackBuffer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glRenderMode</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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