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176 lines
8.4 KiB
XML
176 lines
8.4 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="glXCreateNewContext">
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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>glXCreateNewContext</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glXCreateNewContext</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>glXCreateNewContext</function></funcdef>
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<paramdef>Display * <parameter>dpy</parameter></paramdef>
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<paramdef>GLXFBConfig <parameter>config</parameter></paramdef>
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<paramdef>int <parameter>render_type</parameter></paramdef>
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<paramdef>GLXContext <parameter>share_list</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>config</parameter></term>
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<listitem>
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<para>
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Specifies the GLXFBConfig structure with the desired attributes for the
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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>render_type</parameter></term>
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<listitem>
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<para>
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Specifies the type of the context to be created. Must be one of
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<constant>GLX_RGBA_TYPE</constant> or <constant>GLX_COLOR_INDEX_TYPE</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>share_list</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>share_list</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>glXCreateNewContext</function> creates a GLX rendering context and returns its handle.
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This context can be used to render into GLX windows, pixmaps, or pixel
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buffers.
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If <function>glXCreateNewContext</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>render_type</parameter> is <constant>GLX_RGBA_TYPE</constant>, then a context that supports RGBA
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rendering is created. If <parameter>config</parameter> is <constant>GLX_COLOR_INDEX_TYPE</constant>, then
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context supporting color-index rendering is created.
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</para>
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<para>
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If <parameter>render_type</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>render_type</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 <parameter>share_list</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>share_list</parameter> is <constant>True</constant>.)
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If <parameter>share_list</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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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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<function>glXCreateNewContext</function> is available only if the GLX version is 1.3 or greater.
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</para>
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<para>
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If the GLX version is 1.1 or 1.0, the GL version must be 1.0.
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If the GLX version is 1.2, then the GL version must be 1.1.
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If the GLX version is 1.3, then the GL version must be 1.2.
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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>GLXBadContext</constant> is generated if <parameter>render_type</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>GLXBadFBConfig</constant> is generated if <parameter>config</parameter> is not a valid
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GLXFBConfig.
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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>render_type</parameter>.
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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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<para>
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<constant>BadValue</constant> is generated if <parameter>config</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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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glXChooseFBConfig</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXCreateContext</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXDestroyContext</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXGetFBConfigs</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXGetFBConfigAttrib</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXIsDirect</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXMakeContextCurrent</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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