mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-27 02:25:44 +00:00
175 lines
8.2 KiB
XML
175 lines
8.2 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="glXCreateContext">
|
|
<refmeta>
|
|
<refmetainfo>
|
|
<copyright>
|
|
<year>1991-2006</year>
|
|
<holder>Silicon Graphics, Inc.</holder>
|
|
</copyright>
|
|
</refmetainfo>
|
|
<refentrytitle>glXCreateContext</refentrytitle>
|
|
<manvolnum>3G</manvolnum>
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname>glXCreateContext</refname>
|
|
<refpurpose>create a new GLX rendering context</refpurpose>
|
|
</refnamediv>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>GLXContext <function>glXCreateContext</function></funcdef>
|
|
<paramdef>Display * <parameter>dpy</parameter></paramdef>
|
|
<paramdef>XVisualInfo * <parameter>vis</parameter></paramdef>
|
|
<paramdef>GLXContext <parameter>shareList</parameter></paramdef>
|
|
<paramdef>Bool <parameter>direct</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<!-- eqn: ignoring delim $$ -->
|
|
<refsect1 id="parameters"><title>Parameters</title>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>dpy</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the connection to the X server.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>vis</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the visual that defines the frame buffer resources available to
|
|
the rendering context.
|
|
It is a pointer to an <constant>XVisualInfo</constant> structure,
|
|
not a visual ID or a pointer to a <constant>Visual</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>shareList</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the context with which to share display lists.
|
|
<constant>NULL</constant> indicates that no sharing is to take place.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>direct</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies whether rendering is to be done with a direct connection
|
|
to the graphics system if possible (<constant>True</constant>)
|
|
or through the X server (<constant>False</constant>).
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="description"><title>Description</title>
|
|
<para>
|
|
<function>glXCreateContext</function> creates a GLX rendering context and returns its handle.
|
|
This context can be used to render into both windows and GLX pixmaps.
|
|
If <function>glXCreateContext</function> fails to create a rendering context,
|
|
<constant>NULL</constant> is returned.
|
|
</para>
|
|
<para>
|
|
If <parameter>direct</parameter> is <constant>True</constant>,
|
|
then a direct rendering context is created if the
|
|
implementation supports direct rendering, if the connection is to an X
|
|
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>.)
|
|
If <parameter>direct</parameter> is <constant>False</constant>,
|
|
then a rendering context that renders through the X server is always created.
|
|
Direct rendering provides a performance advantage in some implementations.
|
|
However, direct rendering contexts cannot be shared outside a single process,
|
|
and they may be unable to render to GLX pixmaps.
|
|
</para>
|
|
<para>
|
|
If <parameter>shareList</parameter> is not <constant>NULL</constant>,
|
|
then all display-list indexes and definitions are shared by
|
|
context <parameter>shareList</parameter> and by the newly created context.
|
|
An arbitrary number of contexts can share a single display-list space.
|
|
However,
|
|
all rendering contexts that share a single display-list space must
|
|
themselves exist in the same address space.
|
|
Two rendering contexts share an address space if both are nondirect
|
|
using the same server,
|
|
or if both are direct and owned by a single process.
|
|
Note that in the nondirect case, it is not necessary for the calling
|
|
threads to share an address space,
|
|
only for their related rendering contexts to share an address space.
|
|
</para>
|
|
<para>
|
|
If the GL version is 1.1 or greater,
|
|
then all texture objects except object 0
|
|
are shared by any contexts that share display lists.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="notes"><title>Notes</title>
|
|
<para>
|
|
<constant>XVisualInfo</constant> is defined in <emphasis>Xutil.h.</emphasis>
|
|
It is a structure that includes <emphasis>visual</emphasis>, <emphasis>visualID</emphasis>, <emphasis>screen</emphasis>, and
|
|
<emphasis>depth</emphasis> elements.
|
|
</para>
|
|
<para>
|
|
A <emphasis>process</emphasis> is a single execution environment,
|
|
implemented in a single address space,
|
|
consisting of one or more threads.
|
|
</para>
|
|
<para>
|
|
A <emphasis>thread</emphasis> is one of a set of subprocesses that share
|
|
a single address space,
|
|
but maintain separate program counters,
|
|
stack spaces,
|
|
and other related global data.
|
|
A <emphasis>thread</emphasis> that is the only member of its subprocess group
|
|
is equivalent to a <emphasis>process</emphasis>.
|
|
</para>
|
|
<para>
|
|
It may not be possible to render to a GLX pixmap with a direct rendering
|
|
context.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
<para>
|
|
<constant>NULL</constant> is returned if execution fails on the client side.
|
|
</para>
|
|
<para>
|
|
<constant>BadMatch</constant> is generated if the context to be created would not
|
|
share the address space or the screen of the context specified by <parameter>shareList</parameter>.
|
|
</para>
|
|
<para>
|
|
<constant>BadValue</constant> is generated if <parameter>vis</parameter> is not a valid visual (for
|
|
example, if a particular GLX implementation does not support it).
|
|
</para>
|
|
<para>
|
|
<constant>GLXBadContext</constant> is generated if <parameter>shareList</parameter> is not a GLX context
|
|
and is not <constant>NULL</constant>.
|
|
</para>
|
|
<para>
|
|
<constant>BadAlloc</constant> is generated if the server does not have enough
|
|
resources to allocate the new context.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glXDestroyContext</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glXGetConfig</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glXIsDirect</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glXMakeCurrent</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>
|