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175 lines
8.2 KiB
XML
175 lines
8.2 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="glXCreateContext">
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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>glXCreateContext</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glXCreateContext</refname>
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<refpurpose>create a new GLX rendering context</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>GLXContext <function>glXCreateContext</function></funcdef>
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<paramdef>Display * <parameter>dpy</parameter></paramdef>
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<paramdef>XVisualInfo * <parameter>vis</parameter></paramdef>
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<paramdef>GLXContext <parameter>shareList</parameter></paramdef>
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<paramdef>Bool <parameter>direct</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>vis</parameter></term>
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<listitem>
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<para>
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Specifies the visual that defines the frame buffer resources available to
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the rendering context.
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It is a pointer to an <constant>XVisualInfo</constant> structure,
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not a visual ID or a pointer to a <constant>Visual</constant>.
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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>shareList</parameter></term>
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<listitem>
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<para>
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Specifies the context with which to share display lists.
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<constant>NULL</constant> indicates that no sharing is to take place.
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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>direct</parameter></term>
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<listitem>
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<para>
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Specifies whether rendering is to be done with a direct connection
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to the graphics system if possible (<constant>True</constant>)
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or through the X server (<constant>False</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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<function>glXCreateContext</function> creates a GLX rendering context and returns its handle.
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This context can be used to render into both windows and GLX pixmaps.
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If <function>glXCreateContext</function> fails to create a rendering context,
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<constant>NULL</constant> is returned.
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</para>
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<para>
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If <parameter>direct</parameter> is <constant>True</constant>,
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then a direct rendering context is created if the
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implementation supports direct rendering, if the connection is to an X
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server that is local, and if a direct rendering context is available. (An implementation may return an indirect context when <parameter>direct</parameter> is <constant>True</constant>.)
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If <parameter>direct</parameter> is <constant>False</constant>,
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then a rendering context that renders through the X server is always created.
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Direct rendering provides a performance advantage in some implementations.
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However, direct rendering contexts cannot be shared outside a single process,
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and they may be unable to render to GLX pixmaps.
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</para>
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<para>
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If <parameter>shareList</parameter> is not <constant>NULL</constant>,
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then all display-list indexes and definitions are shared by
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context <parameter>shareList</parameter> and by the newly created context.
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An arbitrary number of contexts can share a single display-list space.
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However,
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all rendering contexts that share a single display-list space must
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themselves exist in the same 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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If the GL version is 1.1 or greater,
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then all texture objects except object 0
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are shared by any contexts that share display lists.
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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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<constant>XVisualInfo</constant> is defined in <emphasis>Xutil.h.</emphasis>
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It is a structure that includes <emphasis>visual</emphasis>, <emphasis>visualID</emphasis>, <emphasis>screen</emphasis>, and
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<emphasis>depth</emphasis> elements.
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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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<para>
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It may not be possible to render to a GLX pixmap with a direct rendering
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context.
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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>NULL</constant> is returned if execution fails on the client side.
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</para>
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<para>
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<constant>BadMatch</constant> is generated if the context to be created would not
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share the address space or the screen of the context specified by <parameter>shareList</parameter>.
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</para>
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<para>
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<constant>BadValue</constant> is generated if <parameter>vis</parameter> is not a valid visual (for
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example, if a particular GLX implementation does not support it).
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</para>
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<para>
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<constant>GLXBadContext</constant> is generated if <parameter>shareList</parameter> is not a GLX context
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and is not <constant>NULL</constant>.
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</para>
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<para>
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<constant>BadAlloc</constant> is generated if the server does not have enough
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resources to allocate the new 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>glXDestroyContext</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXGetConfig</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXIsDirect</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXMakeCurrent</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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