124 lines
5.5 KiB
XML
124 lines
5.5 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="glGetQueryiv">
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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>glGetQueryiv</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetQueryiv</refname>
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<refpurpose>return parameters of a query object target</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>glGetQueryiv</function></funcdef>
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<paramdef>GLenum <parameter>target</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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</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>target</parameter></term>
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<listitem>
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<para>
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Specifies a query object target.
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Must be <constant>GL_SAMPLES_PASSED</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>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 target parameter.
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Accepted values are <constant>GL_CURRENT_QUERY</constant> or <constant>GL_QUERY_COUNTER_BITS</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>glGetQueryiv</function> returns in <parameter>params</parameter> a selected parameter of the query object target
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specified by <parameter>target</parameter>.
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</para>
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<para>
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<parameter>pname</parameter> names a specific query object target parameter. When <parameter>target</parameter> is
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<constant>GL_SAMPLES_PASSED</constant>, <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_CURRENT_QUERY</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns the name of the currently active occlusion query object.
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If no occlusion query is active, 0 is returned. 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_COUNTER_BITS</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns the number of bits in the query counter used to accumulate passing samples.
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If the number of bits returned is 0, the implementation does not support a query counter, and the results
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obtained from <citerefentry><refentrytitle>glGetQueryObject</refentrytitle></citerefentry> are useless.
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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>glGetQueryiv</function> is available only if the GL version is 1.5 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>target</parameter> or <parameter>pname</parameter> is not an
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accepted value.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glGetQueryiv</function>
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is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
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and the corresponding execution of <citerefentry><refentrytitle>glEnd</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>glGetQueryObject</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glIsQuery</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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