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<title>gl_SampleMaskIn - OpenGL 4 Reference Pages</title>
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<div class="refentry" id="gl_SampleMaskIn">
<div class="titlepage"/>
<div class="refnamediv">
<h2>Name</h2>
<p>gl_SampleMaskIn — contains the computed sample coverage mask for the current fragment</p>
</div>
<div class="refsynopsisdiv">
<h2>Declaration</h2>
<code class="fieldsynopsis"><span class="modifier">in </span><span class="type">int </span><span class="varname">gl_SampleMaskIn[] </span>;</code>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>
<code class="varname">gl_SampleMaskIn</code> is a fragment language that indicates the
set of samples covered by the primitive generating the fragment during
multisample rasterization. It has a sample bit set if and only if the sample
is considered covered for this fragment shader invocation. Bit
<span class="emphasis"><em>B</em></span> of mask <code class="varname">gl_SampleMask[M]</code>
corresponds to sample 32 * <span class="emphasis"><em>M</em></span> + <span class="emphasis"><em>B</em></span>.
The array has <code class="function">ceil</code>(<span class="emphasis"><em>s</em></span> / 32) elements
where <span class="emphasis"><em>s</em></span> is the maximum number of color samples supported
by the implementation.
</p>
</div>
<div class="refsect1" id="versions">
<h2>Version Support</h2>
<div class="informaltable">
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<span class="bold"><strong>Variable Name</strong></span>
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<span class="bold"><strong>1.10</strong></span>
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<span class="bold"><strong>1.20</strong></span>
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<span class="bold"><strong>1.40</strong></span>
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<span class="bold"><strong>4.10</strong></span>
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<span class="bold"><strong>4.20</strong></span>
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<span class="bold"><strong>4.30</strong></span>
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<span class="bold"><strong>4.40</strong></span>
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<span class="bold"><strong>4.50</strong></span>
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<td style="text-align: left; border-right: 2px solid ; ">gl_SampleMaskIn</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; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; ">✔</td>
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<div class="refsect1" id="seealso">
<h2>See Also</h2>
<p>
<a class="citerefentry" href="gl_SampleMask.xhtml"><span class="citerefentry"><span class="refentrytitle">gl_SampleMask</span></span></a>,
<a class="citerefentry" href="gl_SampleID.xhtml"><span class="citerefentry"><span class="refentrytitle">gl_SampleID</span></span></a>,
<a class="citerefentry" href="gl_SamplePosition.xhtml"><span class="citerefentry"><span class="refentrytitle">gl_SamplePosition</span></span></a>,
<a class="citerefentry" href="gl_FragCoord.xhtml"><span class="citerefentry"><span class="refentrytitle">gl_FragCoord</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>
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