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<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
<!-- Converted by db4-upgrade version 1.1 -->
<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glGetActiveAtomicCounterBufferiv">
<info>
<copyright>
<year>2011-2014</year>
<holder>Khronos Group.</holder>
</copyright>
</info>
<refmeta>
<refentrytitle>glGetActiveAtomicCounterBufferiv</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glGetActiveAtomicCounterBufferiv</refname>
<refpurpose>retrieve information about the set of active atomic counter buffers for a program</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glGetActiveAtomicCounterBufferiv</function></funcdef>
<paramdef>Gluint <parameter>program</parameter></paramdef>
<paramdef>GLuint <parameter>bufferIndex</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLint *<parameter>params</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 xml:id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>program</parameter></term>
<listitem>
<para>
The name of a program object from which to retrieve information.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>bufferIndex</parameter></term>
<listitem>
<para>
Specifies index of an active atomic counter buffer.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>pname</parameter></term>
<listitem>
<para>
Specifies which parameter of the atomic counter buffer to retrieve.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>params</parameter></term>
<listitem>
<para>
Specifies the address of a variable into which to write the retrieved information.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 xml:id="description"><title>Description</title>
<para>
<function>glGetActiveAtomicCounterBufferiv</function> retrieves information about the set of active
atomic counter buffers for a program object. <parameter>program</parameter> is the name of a program
object for which the command <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>
has been issued in the past. It is not necessary for <parameter>program</parameter> to have been linked
successfully. The link may have failed because the number of active atomic counters exceeded the limits.
</para>
<para>
<parameter>bufferIndex</parameter> specifies the index of an active atomic counter buffer and must be in
the range zero to the value of <constant>GL_ACTIVE_ATOMIC_COUNTER_BUFFERS</constant> minus one. The value
of <constant>GL_ACTIVE_ATOMIC_COUNTER_BUFFERS</constant> for <parameter>program</parameter> indicates the
number of active atomic counter buffer and can be queried with
<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>.
</para>
<para>
If no error occurs, the parameter(s) specified by <parameter>pname</parameter> are returned in <parameter>params</parameter>.
If an error is generated, the contents of <parameter>params</parameter> are not modified.
</para>
<para>
If <parameter>pname</parameter> is <constant>GL_ATOMIC_COUNTER_BUFFER_BINDING</constant>, then the index of the
counter buffer binding point associated with the active atomic counter buffer <parameter>bufferIndex</parameter>
for <parameter>program</parameter> is returned.
</para>
<para>
If <parameter>pname</parameter> is <constant>GL_ATOMIC_COUNTER_BUFFER_DATA_SIZE</constant>, then the implementation-dependent
minimum total buffer object size, in baseic machine units, required to hold all active atomic counters in the
atomic counter binding point identified by <parameter>bufferIndex</parameter> is returned.
</para>
<para>
If <parameter>pname</parameter> is <constant>GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS</constant>, then the number of active
atomic counters for the atomic counter buffer identified by <parameter>bufferIndex</parameter> is returned.
</para>
<para>
If <parameter>pname</parameter> is <constant>GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTER_INDICES</constant>,
then a list of the active atomic counter indices for the atomic counter buffer identified by <parameter>bufferIndex</parameter>
is returned. The number of elements that will be written into <parameter>params</parameter> is the value of
<constant>GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS</constant> for <parameter>bufferIndex</parameter>.
</para>
<para>
If <parameter>pname</parameter> is <constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_VERTEX_SHADER</constant>,
<constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_CONTROL_SHADER</constant>,
<constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_EVALUATION_SHADER</constant>,
<constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_GEOMETRY_SHADER</constant>,
<constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_FRAGMENT_SHADER</constant>,
<constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_COMPUTE_SHADER</constant> then a boolean value indicating
whether the atomic counter buffer identified by <parameter>bufferIndex</parameter> is referenced by the vertex,
tessellation control, tessellation evaluation, geometry, fragment or compute processing stages of <parameter>program</parameter>,
respectively, is returned.
</para>
</refsect1>
<refsect1 xml:id="notes"><title>Notes</title>
<para>
<function>glGetActiveAtomicCounterBufferiv</function> is available only if the
GL version is 4.2 or higher.
</para>
<para>
<constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_COMPUTE_SHADER</constant> is available
only of the GL version is 4.3 or higher.
</para>
</refsect1>
<refsect1 xml:id="errors"><title>Errors</title>
<para>
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>program</parameter> is not the name of a program
object for which <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry> has been called in the past.
</para>
<para>
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>bufferIndex</parameter> is greater than or equal to
the value of <constant>GL_ACTIVE_ATOMIC_COUNTER_BUFFERS</constant> for <parameter>program</parameter>.
</para>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>pname</parameter> is not one of the accepted tokens.
</para>
</refsect1>
<refsect1 xml:id="versions"><title>Version Support</title>
<informaltable>
<tgroup cols="13" align="left">
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
<tbody>
<row>
<entry><function>glGetActiveAtomicCounterBufferiv</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='42']/*)"/>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 xml:id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetActiveSubroutineUniform</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetActiveSubroutineUniformName</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 xml:id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"/> 2011-2014 Khronos Group.
This material may be distributed subject to the terms and conditions set forth in
the Open Publication License, v 1.0, 8 June 1999.
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
</para>
</refsect1>
</refentry>
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