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168 lines
7.8 KiB
XML
168 lines
7.8 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="glPolygonMode">
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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>glPolygonMode</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glPolygonMode</refname>
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<refpurpose>select a polygon rasterization 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>glPolygonMode</function></funcdef>
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<paramdef>GLenum <parameter>face</parameter></paramdef>
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<paramdef>GLenum <parameter>mode</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>face</parameter></term>
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<listitem>
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<para>
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Specifies the polygons that <parameter>mode</parameter> applies to.
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Must be
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<constant>GL_FRONT</constant> for front-facing polygons,
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<constant>GL_BACK</constant> for back-facing polygons,
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or <constant>GL_FRONT_AND_BACK</constant> for front- and back-facing polygons.
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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>mode</parameter></term>
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<listitem>
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<para>
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Specifies how polygons will be rasterized.
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Accepted values are
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<constant>GL_POINT</constant>,
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<constant>GL_LINE</constant>, and
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<constant>GL_FILL</constant>.
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The initial value is <constant>GL_FILL</constant> for both front- and back-facing polygons.
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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>glPolygonMode</function> controls the interpretation of polygons for rasterization.
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<parameter>face</parameter> describes which polygons <parameter>mode</parameter> applies to:
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front-facing polygons (<constant>GL_FRONT</constant>),
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back-facing polygons (<constant>GL_BACK</constant>),
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or both (<constant>GL_FRONT_AND_BACK</constant>).
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The polygon mode affects only the final rasterization of polygons.
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In particular,
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a polygon's vertices are lit and
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the polygon is clipped and possibly culled before these modes are applied.
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</para>
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<para>
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Three modes are defined and can be specified in <parameter>mode</parameter>:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GL_POINT</constant></term>
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<listitem>
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<para>
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Polygon vertices that are marked as the start of a boundary edge
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are drawn as points.
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Point attributes such as
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<constant>GL_POINT_SIZE</constant> and
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<constant>GL_POINT_SMOOTH</constant> control
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the rasterization of the points.
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Polygon rasterization attributes other than <constant>GL_POLYGON_MODE</constant> have no effect.
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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_LINE</constant></term>
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<listitem>
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<para>
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Boundary edges of the polygon are drawn as line segments.
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They are treated as connected line segments for line stippling;
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the line stipple counter and pattern are not reset between segments
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(see <citerefentry><refentrytitle>glLineStipple</refentrytitle></citerefentry>).
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Line attributes such as
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<constant>GL_LINE_WIDTH</constant> and
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<constant>GL_LINE_SMOOTH</constant> control
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the rasterization of the lines.
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Polygon rasterization attributes other than <constant>GL_POLYGON_MODE</constant> have no effect.
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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_FILL</constant></term>
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<listitem>
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<para>
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The interior of the polygon is filled.
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Polygon attributes such as
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<constant>GL_POLYGON_STIPPLE</constant> and
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<constant>GL_POLYGON_SMOOTH</constant> control the rasterization of the polygon.
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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="examples"><title>Examples</title>
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<para>
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To draw a surface with filled back-facing polygons
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and outlined front-facing polygons,
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call
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<programlisting>
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glPolygonMode(<constant>GL_FRONT</constant>, <constant>GL_LINE</constant>);
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</programlisting>
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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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Vertices are marked as boundary or nonboundary with an edge flag.
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Edge flags are generated internally by the GL when it decomposes
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polygons; they can be set explicitly using <citerefentry><refentrytitle>glEdgeFlag</refentrytitle></citerefentry>.
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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_ENUM</constant> is generated if either <parameter>face</parameter> or <parameter>mode</parameter> is not
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an accepted value.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glPolygonMode</function>
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is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
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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_POLYGON_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>glBegin</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glEdgeFlag</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glLineStipple</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glLineWidth</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPointSize</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPolygonStipple</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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