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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<head>
<title>glGetActiveAtomicCounterBufferiv - OpenGL 4 Reference Pages</title>
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<div class="refentry" id="glGetActiveAtomicCounterBufferiv">
<div class="titlepage"/>
<div class="refnamediv">
<h2>Name</h2>
<p>glGetActiveAtomicCounterBufferiv — retrieve information about the set of active atomic counter buffers for a program</p>
</div>
<div class="refsynopsisdiv">
<h2>C Specification</h2>
<div class="funcsynopsis">
<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
<tr>
<td>
<code class="funcdef">void <strong class="fsfunc">glGetActiveAtomicCounterBufferiv</strong>(</code>
</td>
<td>Gluint <var class="pdparam">program</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLuint <var class="pdparam">bufferIndex</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLenum <var class="pdparam">pname</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLint *<var class="pdparam">params</var><code>)</code>;</td>
</tr>
</table>
<div class="funcprototype-spacer"> </div>
</div>
</div>
<div class="refsect1" id="parameters">
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<em class="parameter">
<code>program</code>
</em>
</span>
</dt>
<dd>
<p>
The name of a program object from which to retrieve information.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>bufferIndex</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies index of an active atomic counter buffer.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>pname</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies which parameter of the atomic counter buffer to retrieve.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>params</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the address of a variable into which to write the retrieved information.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>
<code class="function">glGetActiveAtomicCounterBufferiv</code> retrieves information about the set of active
atomic counter buffers for a program object. <em class="parameter"><code>program</code></em> is the name of a program
object for which the command <a class="citerefentry" href="glLinkProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a>
has been issued in the past. It is not necessary for <em class="parameter"><code>program</code></em> to have been linked
successfully. The link may have failed because the number of active atomic counters exceeded the limits.
</p>
<p>
<em class="parameter"><code>bufferIndex</code></em> specifies the index of an active atomic counter buffer and must be in
the range zero to the value of <code class="constant">GL_ACTIVE_ATOMIC_COUNTER_BUFFERS</code> minus one. The value
of <code class="constant">GL_ACTIVE_ATOMIC_COUNTER_BUFFERS</code> for <em class="parameter"><code>program</code></em> indicates the
number of active atomic counter buffer and can be queried with
<a class="citerefentry" href="glGetProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetProgram</span></span></a>.
</p>
<p>
If no error occurs, the parameter(s) specified by <em class="parameter"><code>pname</code></em> are returned in <em class="parameter"><code>params</code></em>.
If an error is generated, the contents of <em class="parameter"><code>params</code></em> are not modified.
</p>
<p>
If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ATOMIC_COUNTER_BUFFER_BINDING</code>, then the index of the
counter buffer binding point associated with the active atomic counter buffer <em class="parameter"><code>bufferIndex</code></em>
for <em class="parameter"><code>program</code></em> is returned.
</p>
<p>
If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ATOMIC_COUNTER_BUFFER_DATA_SIZE</code>, 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 <em class="parameter"><code>bufferIndex</code></em> is returned.
</p>
<p>
If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS</code>, then the number of active
atomic counters for the atomic counter buffer identified by <em class="parameter"><code>bufferIndex</code></em> is returned.
</p>
<p>
If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTER_INDICES</code>,
then a list of the active atomic counter indices for the atomic counter buffer identified by <em class="parameter"><code>bufferIndex</code></em>
is returned. The number of elements that will be written into <em class="parameter"><code>params</code></em> is the value of
<code class="constant">GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS</code> for <em class="parameter"><code>bufferIndex</code></em>.
</p>
<p>
If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_VERTEX_SHADER</code>,
<code class="constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_CONTROL_SHADER</code>,
<code class="constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_EVALUATION_SHADER</code>,
<code class="constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_GEOMETRY_SHADER</code>,
<code class="constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_FRAGMENT_SHADER</code>,
<code class="constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_COMPUTE_SHADER</code> then a boolean value indicating
whether the atomic counter buffer identified by <em class="parameter"><code>bufferIndex</code></em> is referenced by the vertex,
tessellation control, tessellation evaluation, geometry, fragment or compute processing stages of <em class="parameter"><code>program</code></em>,
respectively, is returned.
</p>
</div>
<div class="refsect1" id="notes">
<h2>Notes</h2>
<p>
<code class="function">glGetActiveAtomicCounterBufferiv</code> is available only if the
GL version is 4.2 or higher.
</p>
<p>
<code class="constant">GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_COMPUTE_SHADER</code> is available
only of the GL version is 4.3 or higher.
</p>
</div>
<div class="refsect1" id="errors">
<h2>Errors</h2>
<p>
<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>program</code></em> is not the name of a program
object for which <a class="citerefentry" href="glLinkProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a> has been called in the past.
</p>
<p>
<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>bufferIndex</code></em> is greater than or equal to
the value of <code class="constant">GL_ACTIVE_ATOMIC_COUNTER_BUFFERS</code> for <em class="parameter"><code>program</code></em>.
</p>
<p>
<code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>pname</code></em> is not one of the accepted tokens.
</p>
</div>
<div class="refsect1" id="versions">
<h2>Version Support</h2>
<div class="informaltable">
<table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">
<colgroup>
<col style="text-align: left; "/>
<col style="text-align: center; " class="firstvers"/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; " class="lastvers"/>
</colgroup>
<thead>
<tr>
<th style="text-align: left; border-right: 2px solid ; ">
</th>
<th style="text-align: center; border-bottom: 2px solid ; " colspan="12">
<span class="bold"><strong>OpenGL Version</strong></span>
</th>
</tr>
<tr>
<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>Function / Feature Name</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>2.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>2.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.2</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.3</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.2</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.3</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.4</strong></span>
</th>
<th style="text-align: center; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.5</strong></span>
</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left; border-right: 2px solid ; ">
<code class="function">glGetActiveAtomicCounterBufferiv</code>
</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; ">✔</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="refsect1" id="seealso">
<h2>See Also</h2>
<p>
<a class="citerefentry" href="glGetProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetProgram</span></span></a>,
<a class="citerefentry" href="glGetActiveSubroutineUniform.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetActiveSubroutineUniform</span></span></a>,
<a class="citerefentry" href="glGetActiveSubroutineUniformName.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetActiveSubroutineUniformName</span></span></a>,
<a class="citerefentry" href="glGetUniformLocation.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetUniformLocation</span></span></a>
</p>
</div>
<div class="refsect1" id="Copyright">
<h2>Copyright</h2>
<p>
Copyright <span class="trademark"/>© 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.
<a class="link" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
</p>
</div>
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