mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-29 19:05:37 +00:00
101 lines
4.7 KiB
XML
101 lines
4.7 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
|
|
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
|
|
<refentry id="gluBeginCurve">
|
|
<refmeta>
|
|
<refmetainfo>
|
|
<copyright>
|
|
<year>1991-2006</year>
|
|
<holder>Silicon Graphics, Inc.</holder>
|
|
</copyright>
|
|
</refmetainfo>
|
|
<refentrytitle>gluBeginCurve</refentrytitle>
|
|
<manvolnum>3G</manvolnum>
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname>gluBeginCurve</refname>
|
|
<refpurpose>delimit a NURBS curve definition</refpurpose>
|
|
</refnamediv>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void <function>gluBeginCurve</function></funcdef>
|
|
<paramdef>GLUnurbs* <parameter>nurb</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void <function>gluEndCurve</function></funcdef>
|
|
<paramdef>GLUnurbs* <parameter>nurb</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<!-- eqn: ignoring delim $$ -->
|
|
<refsect1 id="parameters"><title>Parameters</title>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>nurb</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the NURBS object (created with <citerefentry><refentrytitle>gluNewNurbsRenderer</refentrytitle></citerefentry>).
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="description"><title>Description</title>
|
|
<para>
|
|
Use <function>gluBeginCurve</function> to mark the beginning of a NURBS
|
|
curve definition.
|
|
After
|
|
calling <function>gluBeginCurve</function>, make one or more calls to
|
|
<citerefentry><refentrytitle>gluNurbsCurve</refentrytitle></citerefentry> to define the attributes of the curve.
|
|
Exactly one of the calls to <citerefentry><refentrytitle>gluNurbsCurve</refentrytitle></citerefentry> must have
|
|
a curve type of <constant>GLU_MAP1_VERTEX_3</constant> or <constant>GLU_MAP1_VERTEX_4</constant>.
|
|
To mark the end of the NURBS curve definition, call <citerefentry><refentrytitle>gluEndCurve</refentrytitle></citerefentry>.
|
|
</para>
|
|
<para>
|
|
GL evaluators are used to render the NURBS curve as a series of line
|
|
segments.
|
|
Evaluator state is preserved during rendering
|
|
with <citerefentry><refentrytitle>glPushAttrib</refentrytitle></citerefentry>(<constant>GLU_EVAL_BIT</constant>) and
|
|
<citerefentry><refentrytitle>glPopAttrib</refentrytitle></citerefentry>().
|
|
See the <citerefentry><refentrytitle>glPushAttrib</refentrytitle></citerefentry> reference page for details on exactly what state
|
|
these calls preserve.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="example"><title>Example</title>
|
|
<para>
|
|
The following commands render a textured NURBS curve with normals;
|
|
texture coordinates and normals are also specified as NURBS curves:
|
|
<programlisting>
|
|
gluBeginCurve(nobj);
|
|
gluNurbsCurve(nobj, ..., GL_MAP1_TEXTURE_COORD_2);
|
|
gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL);
|
|
gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4);
|
|
gluEndCurve(nobj);
|
|
</programlisting>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>gluBeginSurface</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>gluBeginTrim</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>gluNewNurbsRenderer</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>gluNurbsCurve</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glPopAttrib</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glPushAttrib</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>
|