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195 lines
9.3 KiB
XML
195 lines
9.3 KiB
XML
<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
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<!-- Converted by db4-upgrade version 1.1 -->
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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glGetQueryObject">
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<info>
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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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<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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</info>
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<refmeta>
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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 xml: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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If a buffer is bound to the <constant>GL_QUERY_RESULT_BUFFER</constant> target, then <parameter>params</parameter>
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is treated as an offset to a location within that buffer's data store to receive the result of the query. If
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no buffer is bound to <constant>GL_QUERY_RESULT_BUFFER</constant>, then <parameter>params</parameter> is
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treated as an address in client memory of a variable to receive the resulting 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 xml: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_NO_WAIT</constant></term>
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<listitem>
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<para>
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If the result of the query is available (that is, a query of <constant>GL_QUERY_RESULT_AVAILABLE</constant> would
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return non-zero), then <parameter>params</parameter> returns the value of the query object's passed samples counter,
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otherwise, the data referred to by <parameter>params</parameter> is not modified.
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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 xml: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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<para>
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<constant>GL_QUERY_RESULT_NO_WAIT</constant> is accepted for <parameter>pname</parameter> only if the
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GL version is 4.4 or greater.
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</para>
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<para>
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The <constant>GL_QUERY_RESULT_BUFFER</constant> target is available only if the GL version is 4.4 or higher.
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On earlier versions of the GL, <parameter>params</parameter> is always an address in client memory.
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</para>
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</refsect1>
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<refsect1 xml: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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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if a buffer is currently bound to the
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<constant>GL_QUERY_RESULT_BUFFER</constant> target and the command would cause data to be written beyond the bounds
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of that buffer's data store.
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</para>
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</refsect1>
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<refsect1 xml: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 xml:id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"/> 2005 Addison-Wesley.
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Copyright <trademark class="copyright"/> 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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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
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</para>
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</refsect1>
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</refentry>
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