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330 lines
14 KiB
XML
330 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="glXSelectEvent">
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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>glXSelectEvent</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glXSelectEvent</refname>
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<refpurpose>select GLX events for a window or a GLX pixel buffer</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>void <function>glXSelectEvent</function></funcdef>
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<paramdef>Display * <parameter>dpy</parameter></paramdef>
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<paramdef>GLXDrawable <parameter>draw</parameter></paramdef>
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<paramdef>unsigned long <parameter>event_mask</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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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>draw</parameter></term>
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<listitem>
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<para>
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Specifies a GLX drawable. Must be a GLX pixel buffer or a 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>event_mask</parameter></term>
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<listitem>
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<para>
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Specifies the events to be returned for <parameter>draw</parameter>.
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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>glXSelectEvent</function> sets the GLX event mask for a GLX pixel buffer or a window.
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Calling <function>glXSelectEvent</function> overrides any previous event mask that was
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set by the client for <parameter>draw</parameter>. Note that it does not affect the
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event masks that other clients may have specified for <parameter>draw</parameter> since
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each client rendering to <parameter>draw</parameter> has a separate event mask for it.
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</para>
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<para>
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Currently, only one GLX event, <constant>GLX_PBUFFER_CLOBBER_MASK</constant>,
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can be selected. The following data is returned to the client when a
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<constant>GLX_PBUFFER_CLOBBER_MASK</constant> event occurs:
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</para>
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<para>
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typedef struct {
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</para>
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<informaltable frame="topbot">
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<tgroup cols="2" align="left">
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<colspec/>
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<colspec/>
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<tbody>
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<row>
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<entry align="left">
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int <emphasis>event_type</emphasis>;
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</entry>
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<entry align="left">
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/* GLX_DAMAGED or GLX_SAVED */
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</entry>
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</row>
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<row>
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<entry align="left">
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int <emphasis>draw_type</emphasis>;
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</entry>
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<entry align="left">
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/* GLX_WINDOW or GLX_PBUFFER */
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</entry>
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</row>
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<row>
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<entry align="left">
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unsigned long <emphasis>serial</emphasis>;
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</entry>
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<entry align="left">
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/* # of last request processed by server */
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</entry>
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</row>
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<row>
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<entry align="left">
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Bool <emphasis>send_event</emphasis>;
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</entry>
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<entry align="left">
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/* true if this came for SendEvent request */
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</entry>
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</row>
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<row>
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<entry align="left">
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Display <emphasis>*display</emphasis>;
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</entry>
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<entry align="left">
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/* display the event was read from */
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</entry>
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</row>
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<row>
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<entry align="left">
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GLXDrawable <emphasis>drawable</emphasis>;
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</entry>
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<entry align="left">
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/* i.d. of Drawable */
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</entry>
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</row>
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<row>
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<entry align="left">
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unsigned int <emphasis>buffer_mask</emphasis>;
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</entry>
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<entry align="left">
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/* mask indicating affected buffers */
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</entry>
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</row>
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<row>
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<entry align="left">
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int <emphasis>x, y</emphasis>;
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</entry>
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<entry align="left">
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</entry>
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</row>
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<row>
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<entry align="left">
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int <emphasis>width, height</emphasis>;
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</entry>
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<entry align="left">
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</entry>
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</row>
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<row>
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<entry align="left">
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int <emphasis>count</emphasis>;
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</entry>
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<entry align="left">
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/* if nonzero, at least this many more */
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<para>
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} GLXPbufferClobberEvent;
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The valid bit masks used in <emphasis>buffer_mask</emphasis> are:
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</para>
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<para>
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</para>
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<informaltable frame="topbot">
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<tgroup cols="2" align="left">
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<colspec/>
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<colspec/>
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<thead>
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<row>
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<entry rowsep="1" align="left"><emphasis role="bold">
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Bitmask
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</emphasis></entry>
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<entry rowsep="1" align="left"><emphasis role="bold">
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Corresponding Buffer
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</emphasis></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry align="left">
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<constant>GLX_FRONT_LEFT_BUFFER_BIT</constant>
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</entry>
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<entry align="left">
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Front left color buffer
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GLX_FRONT_RIGHT_BUFFER_BIT</constant>
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</entry>
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<entry align="left">
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Front right color buffer
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GLX_BACK_LEFT_BUFFER_BIT</constant>
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</entry>
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<entry align="left">
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Back left color buffer
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GLX_BACK_RIGHT_BUFFER_BIT</constant>
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</entry>
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<entry align="left">
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Back right color buffer
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GLX_AUX_BUFFERS_BIT</constant>
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</entry>
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<entry align="left">
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Auxiliary buffer
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GLX_DEPTH_BUFFER_BIT</constant>
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</entry>
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<entry align="left">
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Depth buffer
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GLX_STENCIL_BUFFER_BIT</constant>
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</entry>
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<entry align="left">
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Stencil buffer
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GLX_ACCUM_BUFFER_BIT</constant>
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</entry>
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<entry align="left">
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Accumulation buffer
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<para>
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A single X server operation can cause several buffer clobber events to be
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sent. (e.g., a single GLX pixel buffer may be damaged and cause multiple
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buffer clobber events to be generated). Each event specifies one
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region of the GLX drawable that was affected by the X Server operation.
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The <emphasis>buffer_mask</emphasis> field indicates which color buffers and
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ancillary buffers were affected. All the buffer clobber events
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generated by a single X server action are guaranteed to be
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contiguous in the event queue. The conditions under which this event is
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generated and the <emphasis>event_type</emphasis> varies, depending on the type of the
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GLX drawable.
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</para>
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<para>
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When the <constant>GLX_AUX_BUFFERS_BIT</constant> is set in <emphasis>buffer_mask</emphasis>, then
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<emphasis>aux_buffer</emphasis> is set to indicate which buffer was affected. If more
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than one aux buffer was affected, then additional events are
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generated as part of the same contiguous event group. Each
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additional event will have only the <constant>GLX_AUX_BUFFERS_BIT</constant> set in
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<emphasis>buffer_mask</emphasis>, and the <emphasis>aux_buffer</emphasis> field will be set
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appropriately. For nonstereo drawables,
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<constant>GLX_FRONT_LEFT_BUFFER_BIT</constant> and <constant>GLX_BACK_LEFT_BUFFER_BIT</constant> are
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used to specify the front and back color buffers.
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</para>
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<para>
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For preserved GLX pixel buffers, a buffer clobber event with
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type <constant>GLX_SAVED</constant> is generated whenever the contents of the
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GLX pixel buffer is moved out of offscreen memory. The event(s) describes which
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portions of the GLX pixel buffer were affected. Clients who receive many
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buffer clobber events, referring to different save actions,
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should consider freeing the GLX pixel buffer resource in order to prevent
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the system from thrashing due to insufficient resources.
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</para>
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<para>
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For an unpreserved GLXPbuffer, a buffer clobber event, with type
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<constant>GLX_DAMAGED</constant>, is generated whenever a portion of the GLX pixel buffer
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becomes invalid. The client may wish to regenerate the invalid portions
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of the GLX pixel buffer.
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</para>
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<para>
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For Windows, buffer clobber events, with type <constant>GLX_SAVED</constant>, occur
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whenever an ancillary buffer, associated with the window, gets clobbered
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or moved out of off-screen memory. The event contains information
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indicating which color buffers and ancillary buffers\(emand which portions
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of those buffers\(emwere affected.
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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>glXSelectEvent</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>GLXBadDrawable</constant> is generated if <parameter>draw</parameter> is not a valid window
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or a valid GLX pixel buffer.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glXGetSelectedEvent</refentrytitle></citerefentry>
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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>glXCreatePbuffer</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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