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320 lines
14 KiB
XML
320 lines
14 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="glXGetConfig">
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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>glXGetConfig</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glXGetConfig</refname>
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<refpurpose>return information about GLX visuals</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>int <function>glXGetConfig</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>int <parameter>attrib</parameter></paramdef>
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<paramdef>int * <parameter>value</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 to be queried.
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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>attrib</parameter></term>
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<listitem>
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<para>
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Specifies the visual attribute to be returned.
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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>value</parameter></term>
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<listitem>
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<para>
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Returns the requested value.
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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>glXGetConfig</function> sets <parameter>value</parameter> to the <parameter>attrib</parameter> value of windows or GLX pixmaps
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created with respect to <parameter>vis</parameter>.
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<function>glXGetConfig</function> returns an error code if it fails for any reason.
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Otherwise, zero is returned.
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</para>
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<para>
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<parameter>attrib</parameter> is one of the following:
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</para>
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<para>
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GLX_USE_GL</constant></term>
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<listitem>
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<para>
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<constant>True</constant> if OpenGL rendering is supported by this visual,
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<constant>False</constant> otherwise.
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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_BUFFER_SIZE</constant></term>
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<listitem>
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<para>
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Number of bits per color buffer.
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For RGBA visuals, <constant>GLX_BUFFER_SIZE</constant> is the sum of
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<constant>GLX_RED_SIZE</constant>,
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<constant>GLX_GREEN_SIZE</constant>,
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<constant>GLX_BLUE_SIZE</constant>, and
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<constant>GLX_ALPHA_SIZE</constant>.
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For color index visuals, <constant>GLX_BUFFER_SIZE</constant> is the size of the
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color indexes.
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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_LEVEL</constant></term>
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<listitem>
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<para>
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Frame buffer level of the visual.
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Level zero is the default frame buffer.
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Positive levels correspond to frame buffers that overlay the default buffer,
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and negative levels correspond to frame buffers that underlay the default
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buffer.
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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_RGBA</constant></term>
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<listitem>
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<para>
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<constant>True</constant> if color buffers store red, green, blue, and alpha values.
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<constant>False</constant> if they store color indexes.
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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_DOUBLEBUFFER</constant></term>
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<listitem>
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<para>
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<constant>True</constant> if color buffers exist in front/back pairs that can be swapped,
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<constant>False</constant> otherwise.
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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_STEREO</constant></term>
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<listitem>
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<para>
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<constant>True</constant> if color buffers exist in left/right pairs,
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<constant>False</constant> otherwise.
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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_AUX_BUFFERS</constant></term>
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<listitem>
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<para>
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Number of auxiliary color buffers that are available.
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Zero indicates that no auxiliary color buffers exist.
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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_RED_SIZE</constant></term>
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<listitem>
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<para>
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Number of bits of red stored in each color buffer.
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Undefined if <constant>GLX_RGBA</constant> is <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_GREEN_SIZE</constant></term>
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<listitem>
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<para>
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Number of bits of green stored in each color buffer.
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Undefined if <constant>GLX_RGBA</constant> is <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_BLUE_SIZE</constant></term>
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<listitem>
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<para>
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Number of bits of blue stored in each color buffer.
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Undefined if <constant>GLX_RGBA</constant> is <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_ALPHA_SIZE</constant></term>
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<listitem>
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<para>
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Number of bits of alpha stored in each color buffer.
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Undefined if <constant>GLX_RGBA</constant> is <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_DEPTH_SIZE</constant></term>
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<listitem>
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<para>
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Number of bits in the depth buffer.
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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_STENCIL_SIZE</constant></term>
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<listitem>
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<para>
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Number of bits in the stencil buffer.
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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_ACCUM_RED_SIZE</constant></term>
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<listitem>
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<para>
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Number of bits of red stored in the accumulation buffer.
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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_ACCUM_GREEN_SIZE</constant></term>
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<listitem>
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<para>
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Number of bits of green stored in the accumulation buffer.
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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_ACCUM_BLUE_SIZE</constant></term>
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<listitem>
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<para>
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Number of bits of blue stored in the accumulation buffer.
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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_ACCUM_ALPHA_SIZE</constant></term>
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<listitem>
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<para>
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Number of bits of alpha stored in the accumulation buffer.
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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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The X protocol allows a single visual ID to be instantiated with
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different numbers of bits per pixel.
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Windows or GLX pixmaps that will be rendered with OpenGL, however,
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must be instantiated with a color buffer depth of <constant>GLX_BUFFER_SIZE</constant>.
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</para>
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<para>
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Although a GLX implementation can export many visuals that support GL
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rendering,
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it must support
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at least one RGBA visual. This visual must have at
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least one color buffer,
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a stencil buffer of at least 1 bit,
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a depth buffer of at least 12 bits,
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and an accumulation buffer.
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Alpha bitplanes are optional in this visual.
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However,
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its color buffer size must be as great as that of the
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deepest <constant>TrueColor</constant>, <constant>DirectColor</constant>,
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<constant>PseudoColor</constant>, or <constant>StaticColor</constant> visual supported on level zero,
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and it must itself be made available on level zero.
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</para>
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<para>
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In addition, if the X server exports a <constant>PseudoColor</constant>
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or <constant>StaticColor</constant> visual on framebuffer level 0, a color index
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visual is also required on that level.
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It must have
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at least one color buffer,
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a stencil buffer of at least 1 bit,
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and a depth buffer of at least 12 bits.
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This visual must
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have as many
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color bitplanes as the deepest
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<constant>PseudoColor</constant> or <constant>StaticColor</constant> visual supported on level 0.
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</para>
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<para>
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Applications are best written to select the visual that most closely
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meets their requirements.
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Creating windows or GLX pixmaps with unnecessary buffers can result in
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reduced rendering performance as well as poor resource allocation.
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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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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GLX_NO_EXTENSION</constant> is returned if <parameter>dpy</parameter> does not support the GLX
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extension.
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</para>
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<para>
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<constant>GLX_BAD_SCREEN</constant> is returned if the screen of <parameter>vis</parameter> does not correspond
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to a screen.
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</para>
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<para>
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<constant>GLX_BAD_ATTRIBUTE</constant> is returned if <parameter>attrib</parameter> is not a valid GLX attribute.
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</para>
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<para>
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<constant>GLX_BAD_VISUAL</constant> is returned if <parameter>vis</parameter> doesn't support GLX and an
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attribute other than <constant>GLX_USE_GL</constant> is requested.
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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>glXChooseVisual</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXCreateContext</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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