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<title>gl_SamplePosition - OpenGL 4 Reference Pages</title>
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<div class="refentry" id="gl_SamplePosition">
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<div class="refnamediv">
<h2>Name</h2>
<p>gl_SamplePosition — contains the location of the current sample within the current fragment</p>
</div>
<div class="refsynopsisdiv">
<h2>Declaration</h2>
<code class="fieldsynopsis"><span class="modifier">in </span><span class="type">vec2 </span><span class="varname">gl_SamplePosition </span>;</code>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>
<code class="varname">gl_SamplePosition</code> is a fragment language input variable that contains
the location within a fragment of the sample currently being processed. The x and y components
of <code class="varname">gl_SamplePosition</code> contain the sub-pixel coordinate of the current
sample and will have values in the range 0.0 to 1.0. The sub-pixel coordinates of the center
of the pixel are always (0.5, 0.5). Any static use of <code class="varname">gl_SamplePosition</code>
causes the entire fragment shader to be evaluated per-sample rather than per-fragment. When rendering
to a non-multisample buffer, or if multisample rasterization is disabled, <code class="varname">gl_SamplePosition</code>
will be (0.5, 0.5).
</p>
</div>
<div class="refsect1" id="versions">
<h2>Version Support</h2>
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<span class="bold"><strong>Function Name</strong></span>
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<span class="bold"><strong>1.10</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_SamplePosition</td>
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<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; ">✔</td>
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<div class="refsect1" id="seealso">
<h2>See Also</h2>
<p>
<a class="citerefentry" href="gl_SampleID.xhtml"><span class="citerefentry"><span class="refentrytitle">gl_SampleID</span></span></a>,
<a class="citerefentry" href="gl_SampleMask.xhtml"><span class="citerefentry"><span class="refentrytitle">gl_SampleMask</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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