421 lines
21 KiB
XML
421 lines
21 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="glFeedbackBuffer">
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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>glFeedbackBuffer</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glFeedbackBuffer</refname>
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<refpurpose>controls feedback mode</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>glFeedbackBuffer</function></funcdef>
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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>GLfloat * <parameter>buffer</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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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>size</parameter></term>
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<listitem>
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<para>
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Specifies the maximum number of values that can be written into <parameter>buffer</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>type</parameter></term>
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<listitem>
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<para>
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Specifies a symbolic constant that describes the information
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that will be returned for each vertex.
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<constant>GL_2D</constant>,
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<constant>GL_3D</constant>,
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<constant>GL_3D_COLOR</constant>,
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<constant>GL_3D_COLOR_TEXTURE</constant>, and
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<constant>GL_4D_COLOR_TEXTURE</constant> are accepted.
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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>buffer</parameter></term>
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<listitem>
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<para>
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Returns the feedback data.
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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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The <function>glFeedbackBuffer</function> function controls feedback.
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Feedback, like selection, is a GL 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, information about primitives that would have been
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rasterized is fed back to the application using the GL.
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</para>
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<para>
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<function>glFeedbackBuffer</function> has three arguments:
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<parameter>buffer</parameter> is a pointer to an array of floating-point values
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into which feedback information is placed.
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<parameter>size</parameter> indicates the size of the array.
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<parameter>type</parameter> is a symbolic constant describing the information
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that is fed back for each vertex.
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<function>glFeedbackBuffer</function> must be issued before feedback mode is enabled
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(by calling <citerefentry><refentrytitle>glRenderMode</refentrytitle></citerefentry> with argument <constant>GL_FEEDBACK</constant>).
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Setting <constant>GL_FEEDBACK</constant> without establishing the feedback buffer,
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or calling <function>glFeedbackBuffer</function> while the GL is in feedback mode,
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is an error.
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</para>
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<para>
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When <citerefentry><refentrytitle>glRenderMode</refentrytitle></citerefentry> is called while in feedback mode, it returns the number of entries
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placed in the feedback array and resets the feedback array pointer to the base
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of the feedback buffer. The returned value never exceeds <parameter>size</parameter>. If the feedback
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data required more room than was available in <parameter>buffer</parameter>,
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<citerefentry><refentrytitle>glRenderMode</refentrytitle></citerefentry> returns a negative value.
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To take the GL out of feedback mode, call
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<citerefentry><refentrytitle>glRenderMode</refentrytitle></citerefentry> with a parameter value other than <constant>GL_FEEDBACK</constant>.
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</para>
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<para>
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While in feedback mode,
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each primitive, bitmap, or pixel rectangle that would be rasterized
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generates a block of values that are copied into the feedback array.
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If doing so would cause the number of entries to exceed the maximum,
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the block is partially written so as to fill the array
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(if there is any room left at all),
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and an overflow flag is set.
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Each block begins with a code indicating the primitive type,
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followed by values that describe the primitive's vertices and
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associated data.
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Entries are also written for bitmaps and pixel rectangles.
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Feedback occurs after polygon culling and <citerefentry><refentrytitle>glPolygonMode</refentrytitle></citerefentry> interpretation
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of polygons has taken place,
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so polygons that are culled are not returned in the feedback buffer.
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It can also occur after polygons with more than three edges are broken up
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into triangles,
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if the GL implementation renders polygons by performing this decomposition.
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</para>
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<para>
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The <citerefentry><refentrytitle>glPassThrough</refentrytitle></citerefentry> command can be used to insert a marker
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into the feedback buffer.
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See <citerefentry><refentrytitle>glPassThrough</refentrytitle></citerefentry>.
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</para>
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<para>
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Following is the grammar for the blocks of values written
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into the feedback buffer.
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Each primitive is indicated with a unique identifying value
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followed by some number of vertices.
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Polygon entries include an integer value indicating how many vertices follow.
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A vertex is fed back as some number of floating-point values,
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as determined by <parameter>type</parameter>.
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Colors are fed back as four values in RGBA mode and one value
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in color index mode.
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</para>
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<para>
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<para>
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feedbackList <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> feedbackItem feedbackList | feedbackItem
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</para>
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<para>
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feedbackItem <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> point | lineSegment | polygon | bitmap | pixelRectangle | passThru
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</para>
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<para>
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point <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> <constant>GL_POINT_TOKEN</constant> vertex
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</para>
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<para>
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lineSegment <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> <constant>GL_LINE_TOKEN</constant> vertex vertex | <constant>GL_LINE_RESET_TOKEN</constant> vertex vertex
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</para>
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<para>
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polygon <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> <constant>GL_POLYGON_TOKEN</constant> n polySpec
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</para>
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<para>
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polySpec <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> polySpec vertex | vertex vertex vertex
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</para>
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<para>
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bitmap <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> <constant>GL_BITMAP_TOKEN</constant> vertex
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</para>
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<para>
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pixelRectangle <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> <constant>GL_DRAW_PIXEL_TOKEN</constant> vertex | <constant>GL_COPY_PIXEL_TOKEN</constant> vertex
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</para>
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<para>
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passThru <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> <constant>GL_PASS_THROUGH_TOKEN</constant> value
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</para>
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<para>
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vertex <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> 2d | 3d | 3dColor | 3dColorTexture | 4dColorTexture
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</para>
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<para>
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2d <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> value value
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</para>
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<para>
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3d <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> value value value
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</para>
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<para>
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3dColor <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> value value value color
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</para>
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<para>
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3dColorTexture <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> value value value color tex
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</para>
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<para>
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4dColorTexture <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> value value value value color tex
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</para>
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<para>
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color <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> rgba | index
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</para>
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<para>
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rgba <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> value value value value
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</para>
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<para>
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index <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> value
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</para>
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<para>
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tex <inlineequation><mml:math><mml:mrow><mml:mn>←</mml:mn></mml:mrow></mml:math></inlineequation> value value value value
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</para>
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<para>
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</para>
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</para>
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<para>
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<emphasis>value</emphasis>
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is a floating-point number,
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and
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<emphasis>n</emphasis>
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is a floating-point integer giving the number of vertices in the polygon.
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<constant>GL_POINT_TOKEN</constant>,
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<constant>GL_LINE_TOKEN</constant>,
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<constant>GL_LINE_RESET_TOKEN</constant>,
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<constant>GL_POLYGON_TOKEN</constant>,
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<constant>GL_BITMAP_TOKEN</constant>,
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<constant>GL_DRAW_PIXEL_TOKEN</constant>,
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<constant>GL_COPY_PIXEL_TOKEN</constant> and
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<constant>GL_PASS_THROUGH_TOKEN</constant> are symbolic floating-point constants.
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<constant>GL_LINE_RESET_TOKEN</constant> is returned whenever the line stipple pattern
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is reset.
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The data returned as a vertex depends on the feedback <parameter>type</parameter>.
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</para>
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<para>
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The following table gives the correspondence between <parameter>type</parameter>
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and the number of values per vertex.
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<emphasis>k</emphasis> is 1 in color index mode and 4 in RGBA mode.
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</para>
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<para>
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</para>
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<informaltable frame="topbot">
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<tgroup cols="5" align="left">
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<colspec colwidth="2.7*" />
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<colspec colwidth="1.5*" />
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<colspec colwidth="1*" align="center"/>
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<colspec colwidth="1*" align="center"/>
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<colspec colwidth="2.5*" align="center"/>
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<thead>
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<row>
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<entry rowsep="1" align="left"><emphasis role="bold">
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Type
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</emphasis></entry>
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<entry rowsep="1" align="left"><emphasis role="bold">
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Coordinates
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</emphasis></entry>
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<entry rowsep="1" align="center"><emphasis role="bold">
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Color
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</emphasis></entry>
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<entry rowsep="1" align="center"><emphasis role="bold">
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Texture
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</emphasis></entry>
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<entry rowsep="1" align="center"><emphasis role="bold">
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Total Number of Values
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</emphasis></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry align="left">
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<constant>GL_2D</constant>
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</entry>
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<entry align="left">
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<emphasis>x</emphasis>, <emphasis>y</emphasis>
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</entry>
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<entry align="center">
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</entry>
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<entry align="center">
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</entry>
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<entry align="center">
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2
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_3D</constant>
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</entry>
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<entry align="left">
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<emphasis>x</emphasis>, <emphasis>y</emphasis>, <emphasis>z</emphasis>
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</entry>
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<entry align="center">
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</entry>
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<entry align="center">
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</entry>
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<entry align="center">
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3
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_3D_COLOR</constant>
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</entry>
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<entry align="left">
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<emphasis>x</emphasis>, <emphasis>y</emphasis>, <emphasis>z</emphasis>
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</entry>
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<entry align="center">
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<inlineequation><mml:math><mml:mi mathvariant="italic">k</mml:mi></mml:math></inlineequation>
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</entry>
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<entry align="center">
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</entry>
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<entry align="center">
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<inlineequation><mml:math>
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<!-- eqn: 3 + k:-->
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<mml:mrow>
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<mml:mn>3</mml:mn>
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<mml:mo>+</mml:mo>
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<mml:mi mathvariant="italic">k</mml:mi>
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</mml:mrow>
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</mml:math></inlineequation>
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_3D_COLOR_TEXTURE</constant>
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</entry>
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<entry align="left">
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<emphasis>x</emphasis>, <emphasis>y</emphasis>, <emphasis>z</emphasis>
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</entry>
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<entry align="center">
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<inlineequation><mml:math><mml:mi mathvariant="italic">k</mml:mi></mml:math></inlineequation>
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</entry>
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<entry align="center">
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4
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</entry>
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<entry align="center">
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<inlineequation><mml:math>
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<!-- eqn: 7 + k:-->
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<mml:mrow>
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<mml:mn>7</mml:mn>
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<mml:mo>+</mml:mo>
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<mml:mi mathvariant="italic">k</mml:mi>
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</mml:mrow>
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</mml:math></inlineequation>
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_4D_COLOR_TEXTURE</constant>
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</entry>
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||
|
|
<entry align="left">
|
||
|
|
<emphasis>x</emphasis>, <emphasis>y</emphasis>, <emphasis>z</emphasis>, <emphasis>w</emphasis>
|
||
|
|
</entry>
|
||
|
|
<entry align="center">
|
||
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">k</mml:mi></mml:math></inlineequation>
|
||
|
|
</entry>
|
||
|
|
<entry align="center">
|
||
|
|
4
|
||
|
|
</entry>
|
||
|
|
<entry align="center">
|
||
|
|
<inlineequation><mml:math>
|
||
|
|
<!-- eqn: 8 + k:-->
|
||
|
|
<mml:mrow>
|
||
|
|
<mml:mn>8</mml:mn>
|
||
|
|
<mml:mo>+</mml:mo>
|
||
|
|
<mml:mi mathvariant="italic">k</mml:mi>
|
||
|
|
</mml:mrow>
|
||
|
|
</mml:math></inlineequation>
|
||
|
|
</entry>
|
||
|
|
</row>
|
||
|
|
</tbody>
|
||
|
|
</tgroup>
|
||
|
|
</informaltable>
|
||
|
|
<para>
|
||
|
|
Feedback vertex coordinates are in window coordinates,
|
||
|
|
except <emphasis>w</emphasis>,
|
||
|
|
which is in clip coordinates.
|
||
|
|
Feedback colors are lighted, if lighting is enabled.
|
||
|
|
Feedback texture coordinates are generated,
|
||
|
|
if texture coordinate generation is enabled.
|
||
|
|
They are always transformed by the texture matrix.
|
||
|
|
</para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="notes"><title>Notes</title>
|
||
|
|
<para>
|
||
|
|
<function>glFeedbackBuffer</function>, when used in a display list, is not compiled into the display list
|
||
|
|
but is executed immediately.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<function>glFeedbackBuffer</function> returns only the texture coordinate of texture unit <constant>GL_TEXTURE0</constant>.
|
||
|
|
</para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="errors"><title>Errors</title>
|
||
|
|
<para>
|
||
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>type</parameter> is not an accepted value.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>size</parameter> is negative.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <function>glFeedbackBuffer</function> is called while the
|
||
|
|
render mode is <constant>GL_FEEDBACK</constant>,
|
||
|
|
or if <citerefentry><refentrytitle>glRenderMode</refentrytitle></citerefentry> is called with argument <constant>GL_FEEDBACK</constant> before
|
||
|
|
<function>glFeedbackBuffer</function> is called at least once.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <function>glFeedbackBuffer</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="associatedgets"><title>Associated Gets</title>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_RENDER_MODE</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_FEEDBACK_BUFFER_POINTER</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_FEEDBACK_BUFFER_SIZE</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_FEEDBACK_BUFFER_TYPE</constant>
|
||
|
|
</para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="seealso"><title>See Also</title>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glLineStipple</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glPassThrough</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glPolygonMode</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glRenderMode</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glSelectBuffer</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>
|