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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>glDispatchComputeIndirect - OpenGL 4 Reference Pages</title>
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<div class="refentry" id="glDispatchComputeIndirect">
<div class="titlepage"/>
<div class="refnamediv">
<h2>Name</h2>
<p>glDispatchComputeIndirect — launch one or more compute work groups using parameters stored in a buffer</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">glDispatchComputeIndirect</strong>(</code>
</td>
<td>GLintptr <var class="pdparam">indirect</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>indirect</code>
</em>
</span>
</dt>
<dd>
<p>
The offset into the buffer object currently bound to the
<code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code> buffer target at
which the dispatch parameters are stored.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>
<code class="function">glDispatchComputeIndirect</code> launches one or more compute
work groups using parameters stored in the buffer object currently bound
to the <code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code> target.
Each work group is processed by the active program object for the compute
shader stage. While the individual shader invocations within a work group are
executed as a unit, work groups are executed completely independently and in
unspecified order. <em class="parameter"><code>indirect</code></em> contains the offset
into the data store of the buffer object bound to the <code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code>
target at which the parameters are stored.
</p>
<p>
The parameters addressed by <em class="parameter"><code>indirect</code></em> are packed a structure,
which takes the form (in C):
</p>
<pre class="programlisting"> typedef struct {
uint num_groups_x;
uint num_groups_y;
uint num_groups_z;
} DispatchIndirectCommand;</pre>
<p>
</p>
<p>
A call to <code class="function">glDispatchComputeIndirect</code> is equivalent, assuming no
errors are generated, to:
</p>
<pre class="programlisting"> cmd = (const DispatchIndirectCommand *)indirect;
glDispatchComputeIndirect(cmd->num_groups_x, cmd->num_groups_y, cmd->num_groups_z);</pre>
<p>
</p>
<p>
Unlike <a class="citerefentry" href="glDispatchCompute.xhtml"><span class="citerefentry"><span class="refentrytitle">glDispatchCompute</span></span></a>,
no error is generated if any of the <code class="code">num_groups_x</code>,
<code class="code">num_groups_y</code> or <code class="code">num_groups_z</code> members
of the <code class="code">DispatchIndirectCommand</code> is larger than the
value of <code class="constant">GL_MAX_COMPUTE_WORK_GROUP_COUNT</code> for the
corresponding dimension. In such circumstances, behavior is undefined and
may lead to application termination.
</p>
</div>
<div class="refsect1" id="errors">
<h2>Errors</h2>
<p>
<code class="constant">GL_INVALID_OPERATION</code> is generated if there is no active program
for the compute shader stage.
</p>
<p>
<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>indirect</code></em> is
less than zero or not a multiple of four.
</p>
<p>
<code class="constant">GL_INVALID_OPERATION</code> is generated if no buffer is bound to the
<code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code> target or if the command would
source data beyond the end of the buffer object's data store.
</p>
</div>
<div class="refsect1" id="associatedgets">
<h2>Associated Gets</h2>
<p>
<a class="citerefentry" href="glGet.xhtml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAX_COMPUTE_WORK_GROUP_COUNT</code>
</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; "/>
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<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">glDispatchComputeIndirect</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>
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<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="glDispatchCompute.xhtml"><span class="citerefentry"><span class="refentrytitle">glDispatchCompute</span></span></a>.
</p>
</div>
<div class="refsect1" id="Copyright">
<h2>Copyright</h2>
<p>
Copyright <span class="trademark"/>© 2013-2014 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>
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