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154 lines
6.8 KiB
XML
154 lines
6.8 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="glXCopyContext">
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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>glXCopyContext</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glXCopyContext</refname>
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<refpurpose>copy state from one rendering context to another</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>glXCopyContext</function></funcdef>
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<paramdef>Display * <parameter>dpy</parameter></paramdef>
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<paramdef>GLXContext <parameter>src</parameter></paramdef>
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<paramdef>GLXContext <parameter>dst</parameter></paramdef>
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<paramdef>unsigned long <parameter>mask</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>dpy</parameter></term>
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<listitem>
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<para>
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Specifies the connection to the X server.
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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>src</parameter></term>
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<listitem>
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<para>
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Specifies the source context.
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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>dst</parameter></term>
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<listitem>
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<para>
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Specifies the destination context.
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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>mask</parameter></term>
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<listitem>
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<para>
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Specifies which portions of <parameter>src</parameter> state are to be copied to <parameter>dst</parameter>.
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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>glXCopyContext</function> copies selected groups of state variables from <parameter>src</parameter> to <parameter>dst</parameter>.
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<parameter>mask</parameter> indicates which groups of state variables are to be copied.
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<parameter>mask</parameter> contains the bitwise OR of the same symbolic names that are
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passed to the GL command <citerefentry><refentrytitle>glPushAttrib</refentrytitle></citerefentry>.
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The single symbolic constant <constant>GLX_ALL_ATTRIB_BITS</constant> can be used to
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copy the maximum possible portion of rendering state.
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</para>
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<para>
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The copy can be done only if the renderers named by <parameter>src</parameter> and <parameter>dst</parameter>
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share an address space.
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Two rendering contexts share an address space if both are nondirect
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using the same server,
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or if both are direct and owned by a single process.
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Note that in the nondirect case it is not necessary for the calling
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threads to share an address space,
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only for their related rendering contexts to share an address space.
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</para>
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<para>
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Not all values for GL state can be copied.
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For example,
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pixel pack and unpack state,
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render mode state,
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and select and feedback state are not copied.
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The state that can be copied is exactly the state that is manipulated
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by the GL command
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<citerefentry><refentrytitle>glPushAttrib</refentrytitle></citerefentry>.
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</para>
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<para>
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An implicit <citerefentry><refentrytitle>glFlush</refentrytitle></citerefentry> is done by <function>glXCopyContext</function> if <parameter>src</parameter> is the current
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context for the calling thread.
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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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</para>
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<para>
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A <emphasis>process</emphasis> is a single execution environment,
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implemented in a single address space,
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consisting of one or more threads.
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</para>
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<para>
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A <emphasis>thread</emphasis> is one of a set of subprocesses that share
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a single address space,
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but maintain separate program counters,
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stack spaces,
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and other related global data.
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A <emphasis>thread</emphasis> that is the only member of its subprocess group
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is equivalent to a <emphasis>process</emphasis>.
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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>BadMatch</constant> is generated if rendering contexts <parameter>src</parameter> and <parameter>dst</parameter>
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do not share an address space
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or were not created with respect to the same screen.
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</para>
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<para>
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<constant>BadAccess</constant> is generated if <parameter>dst</parameter> is current to any thread
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(including the calling thread) at the time <function>glXCopyContext</function> is called.
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</para>
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<para>
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<constant>GLXBadCurrentWindow</constant> is generated if <parameter>src</parameter> is the current
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context and the current drawable is a window that is no longer valid.
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</para>
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<para>
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<constant>GLXBadContext</constant> is generated if either <parameter>src</parameter> or <parameter>dst</parameter> is not
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a valid GLX context.
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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>glPushAttrib</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXCreateContext</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXIsDirect</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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