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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd">
<?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><link rel="stylesheet" type="text/css" href="opengl-man.css" /><title>glMinSampleShading - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glMinSampleShading"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glMinSampleShading — specifies minimum rate at which sample shaing takes place</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glMinSampleShading</strong>(</code></td><td>GLfloat <var class="pdparam">value</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>value</code></em></span></dt><dd><p>
Specifies the rate at which samples are shaded within each covered pixel.
</p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
<code class="function">glMinSampleShading</code> specifies the rate at which samples are shaded within
a covered pixel. Sample-rate shading is enabled by calling <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
with the parameter <code class="constant">GL_SAMPLE_SHADING</code>. If <code class="constant">GL_MULTISAMPLE</code>
or <code class="constant">GL_SAMPLE_SHADING</code> is disabled, sample shading has no effect.
Otherwise, an implementation must provide at least as many unique color values for
each covered fragment as specified by <em class="parameter"><code>value</code></em> times <em class="parameter"><code>samples</code></em> where
<em class="parameter"><code>samples</code></em> is the value of <code class="constant">GL_SAMPLES</code> for the current
framebuffer. At least 1 sample for each covered fragment is generated.
</p><p>
A <em class="parameter"><code>value</code></em> of 1.0 indicates that each sample in the framebuffer should be
indpendently shaded. A <em class="parameter"><code>value</code></em> of 0.0 effectively allows the GL to ignore
sample rate shading. Any value between 0.0 and 1.0 allows the GL to shade only a subset
of the total samples within each covered fragment. Which samples are shaded and the algorithm
used to select that subset of the fragment's samples is implementation dependent.
</p></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>
The type of the <em class="parameter"><code>value</code></em> parameter was
changed from GLclampf to GLfloat. This change is transparent
to user code and is described in detail on the
<a class="citerefentry" href="removedTypes.xml"><span class="citerefentry"><span class="refentrytitle">removedTypes</span></span></a>
page.
</p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p>
None.
</p></div><div class="refsect1"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
<a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MIN_SAMPLE_SHADING</code>.
</p><p>
<a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_SAMPLES</code>.
</p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
<a class="citerefentry" href="removedTypes.xml"><span class="citerefentry"><span class="refentrytitle">removedTypes</span></span></a>
</p></div><div class="refsect1"><a id="Copyright"></a><h2>Copyright</h2><p>
Copyright <span class="trademark"></span>© 2011-2013 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="ulink" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
</p></div></div></body></html>
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