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108 lines
5.4 KiB
XML
108 lines
5.4 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="glFenceSync">
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<refentryinfo>
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<copyright>
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<year>2010-2013</year>
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<holder>Khronos Group</holder>
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</copyright>
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</refentryinfo>
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<refmeta>
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<refentrytitle>glFenceSync</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glFenceSync</refname>
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<refpurpose>create a new sync object and insert it into the GL command stream</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>GLsync <function>glFenceSync</function></funcdef>
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<paramdef>GLenum <parameter>condition</parameter></paramdef>
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<paramdef>GLbitfield <parameter>flags</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>condition</parameter></term>
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<listitem>
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<para>
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Specifies the condition that must be met to set the sync object's state to signaled. <parameter>condition</parameter>
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must be <constant>GL_SYNC_GPU_COMMANDS_COMPLETE</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>flags</parameter></term>
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<listitem>
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<para>
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Specifies a bitwise combination of flags controlling the behavior of the sync object. No flags are presently defined
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for this operation and <parameter>flags</parameter> must be zero.<footnote><para>
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<parameter>flags</parameter> is a placeholder for anticipated future extensions of fence sync object capabilities.
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</para>
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</footnote>
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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>glFenceSync</function> creates a new fence sync object, inserts a fence command into the GL command stream and
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associates it with that sync object, and returns a non-zero name corresponding to the sync object.
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</para>
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<para>
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When the specified <parameter>condition</parameter> of the sync object is satisfied by the fence command, the sync object
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is signaled by the GL, causing any <citerefentry><refentrytitle>glWaitSync</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glClientWaitSync</refentrytitle></citerefentry> commands blocking in <parameter>sync</parameter>
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to <emphasis>unblock</emphasis>. No other state is affected by <function>glFenceSync</function> or by the execution
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of the associated fence command.
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</para>
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<para>
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<parameter>condition</parameter> must be <constant>GL_SYNC_GPU_COMMANDS_COMPLETE</constant>. This condition is satisfied by
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completion of the fence command corresponding to the sync object and all preceding commands in the same command stream.
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The sync object will not be signaled until all effects from these commands on GL client and server state and the
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framebuffer are fully realized. Note that completion of the fence command occurs once the state of the corresponding sync
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object has been changed, but commands waiting on that sync object may not be unblocked until after the fence command completes.
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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>glFenceSync</function> is only supported if the GL version is 3.2 or greater, or if
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the <code>ARB_sync</code> extension is supported.
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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>GL_INVALID_ENUM</constant> is generated if <parameter>condition</parameter> is not
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<constant>GL_SYNC_GPU_COMMANDS_COMPLETE</constant>.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>flags</parameter> is not zero.
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</para>
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<para>
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Additionally, if <function>glFenceSync</function> fails, it will return zero.
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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>glDeleteSync</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetSync</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glWaitSync</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glClientWaitSync</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> 2010-2013 Khronos Group.
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This material may be distributed subject to the terms and conditions set forth in
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the Open Publication License, v 1.0, 8 June 1999.
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<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
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</para>
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</refsect1>
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</refentry>
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