173 lines
8.2 KiB
XML
173 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="glXCreatePbuffer">
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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>glXCreatePbuffer</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glXCreatePbuffer</refname>
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<refpurpose>create an off-screen rendering area</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>GLXPbuffer <function>glXCreatePbuffer</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>const int * <parameter>attrib_list</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 a GLXFBConfig structure with the desired attributes for the
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window.
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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>attrib_list</parameter></term>
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<listitem>
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<para>
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Specifies a list of attribute value pairs, which must be terminated with
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<constant>None</constant> or <constant>NULL</constant>. Accepted attributes are
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<constant>GLX_PBUFFER_WIDTH</constant>, <constant>GLX_PBUFFER_HEIGHT</constant>,
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<constant>GLX_PRESERVED_CONTENTS</constant>, and <constant>GLX_LARGEST_PBUFFER</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>glXCreatePbuffer</function> creates an off-screen rendering area and returns its XID.
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Any GLX rendering context that was created with respect to <parameter>config</parameter>
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can be used to render into this window.
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Use <citerefentry><refentrytitle>glXMakeContextCurrent</refentrytitle></citerefentry> to associate the rendering area with a GLX
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rendering context.
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</para>
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<para>
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The accepted attributes for a GLXPbuffer are:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GLX_PBUFFER_WIDTH</constant></term>
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<listitem>
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<para>
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Specify the pixel width of the requested GLXPbuffer. The default value
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is 0.
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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><constant>GLX_PBUFFER_HEIGHT</constant></term>
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<listitem>
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<para>
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Specify the pixel height of the requested GLXPbuffer. The default value
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is 0.
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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><constant>GLX_LARGEST_PBUFFER</constant></term>
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<listitem>
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<para>
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Specify to obtain the largest available pixel buffer, if the requested
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allocation would have failed. The width and height of the allocated
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pixel buffer will never exceed the specified <constant>GLX_PBUFFER_WIDTH</constant> or
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<constant>GLX_PBUFFER_HEIGHT</constant>, respectively. Use <citerefentry><refentrytitle>glXQueryDrawable</refentrytitle></citerefentry> to
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retrieve the dimensions of the allocated pixel buffer. The default value is
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<constant>False</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><constant>GLX_PRESERVED_CONTENTS</constant></term>
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<listitem>
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<para>
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Specify if the contents of the pixel buffer should be preserved when a
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resource conflict occurs. If set to <constant>False</constant>, the contents of the
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pixel buffer may be lost at any time. If set to <constant>True</constant>, or not
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specified in <parameter>attrib_list</parameter>, then the contents of the pixel buffer will be preserved
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(most likely by copying the contents into main system memory from the
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frame buffer). In either case, the client can register (using
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<citerefentry><refentrytitle>glXSelectEvent</refentrytitle></citerefentry>, to receive
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pixel buffer clobber events that are generated when the pbuffer contents have
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been preserved or damaged.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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GLXPbuffers contain the color and ancillary buffers specified by
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<parameter>config</parameter>. It is possible to create a pixel buffer with back buffers and
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to swap those buffers using <citerefentry><refentrytitle>glXSwapBuffers</refentrytitle></citerefentry>.
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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>glXCreatePbuffer</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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<para>
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GLXPbuffers are allocated from frame buffer resources; applications
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should consider deallocating them when they are not in use.
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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>BadAlloc</constant> is generated if there are insufficient resources to
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allocate the requested GLXPbuffer.
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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 <parameter>config</parameter> does not support rendering to
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pixel buffers (e.g., <constant>GLX_DRAWABLE_TYPE</constant> does not contain
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<constant>GLX_PBUFFER_BIT</constant>).
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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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<function>glXCreatePbuffer</function>,
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<citerefentry><refentrytitle>glXMakeContextCurrent</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXSelectEvent</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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