161 lines
7.3 KiB
XML
161 lines
7.3 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="glGetQueryObject">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>2005</year>
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<holder>Sams Publishing</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glGetQueryObject</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetQueryObject</refname>
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<refpurpose>return parameters of a query object</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>glGetQueryObjectiv</function></funcdef>
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<paramdef>GLuint <parameter>id</parameter></paramdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLint * <parameter>params</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glGetQueryObjectuiv</function></funcdef>
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<paramdef>GLuint <parameter>id</parameter></paramdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLuint * <parameter>params</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glGetQueryObjecti64v</function></funcdef>
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<paramdef>GLuint <parameter>id</parameter></paramdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLint64 * <parameter>params</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glGetQueryObjectui64v</function></funcdef>
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<paramdef>GLuint <parameter>id</parameter></paramdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLuint64 * <parameter>params</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>id</parameter></term>
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<listitem>
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<para>
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Specifies the name of a query object.
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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>pname</parameter></term>
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<listitem>
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<para>
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Specifies the symbolic name of a query object parameter.
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Accepted values are <constant>GL_QUERY_RESULT</constant> or <constant>GL_QUERY_RESULT_AVAILABLE</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>params</parameter></term>
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<listitem>
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<para>
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Returns the requested data.
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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>glGetQueryObject</function> returns in <parameter>params</parameter> a selected parameter of the query object
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specified by <parameter>id</parameter>.
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</para>
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<para>
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<parameter>pname</parameter> names a specific query object parameter. <parameter>pname</parameter> can be as follows:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GL_QUERY_RESULT</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns the value of the query object's passed samples counter.
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The initial value 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>GL_QUERY_RESULT_AVAILABLE</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns whether the passed samples counter is immediately available.
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If a delay would occur waiting for the query result, <constant>GL_FALSE</constant> is returned.
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Otherwise, <constant>GL_TRUE</constant> is returned, which also indicates that the results of all
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previous queries are available as well.
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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="notes"><title>Notes</title>
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<para>
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If an error is generated,
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no change is made to the contents of <parameter>params</parameter>.
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</para>
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<para>
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<function>glGetQueryObject</function> implicitly flushes the GL pipeline so that any incomplete rendering
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delimited by the occlusion query completes in finite time.
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</para>
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<para>
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If multiple queries are issued using the same query object <parameter>id</parameter> before calling
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<function>glGetQueryObject</function>, the results of the most recent query will be returned. In this case,
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when issuing a new query, the results of the previous query are discarded.
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</para>
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<para>
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<function>glGetQueryObjecti64v</function> and <function>glGetQueryObjectui64v</function> are available only
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if the GL version is 3.3 or greater.
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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>pname</parameter> is not an accepted value.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>id</parameter> is not the name of a query object.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>id</parameter> is the name of a currently active
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query object.
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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>glBeginQuery</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glEndQuery</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetQueryiv</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glIsQuery</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glQueryCounter</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> 2005 Addison-Wesley.
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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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