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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>glClearColor - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glClearColor"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glClearColor — specify clear values for the color buffers</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">glClearColor</strong>(</code></td><td>GLfloat <var class="pdparam">red</var>, </td></tr><tr><td> </td><td>GLfloat <var class="pdparam">green</var>, </td></tr><tr><td> </td><td>GLfloat <var class="pdparam">blue</var>, </td></tr><tr><td> </td><td>GLfloat <var class="pdparam">alpha</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>red</code></em>, </span><span class="term"><em class="parameter"><code>green</code></em>, </span><span class="term"><em class="parameter"><code>blue</code></em>, </span><span class="term"><em class="parameter"><code>alpha</code></em></span></dt><dd><p>
Specify the red, green, blue, and alpha values used when the
color buffers are cleared.
The initial values are all 0.
</p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
<code class="function">glClearColor</code> specifies the red,
green,
blue,
and alpha values used by <a class="citerefentry" href="glClear.xml"><span class="citerefentry"><span class="refentrytitle">glClear</span></span></a> to clear the color buffers.
Values specified by <code class="function">glClearColor</code> are clamped to the range
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<mml:mfenced open="[" close="]">
<mml:mn>0</mml:mn>
<mml:mn>1</mml:mn>
</mml:mfenced>
</mml:math>.
</p></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>
The type of the <em class="parameter"><code>red</code></em>,
<em class="parameter"><code>green</code></em>, <em class="parameter"><code>blue</code></em>,
and <em class="parameter"><code>alpha</code></em> parameters 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="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_COLOR_CLEAR_VALUE</code>
</p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
<a class="citerefentry" href="glClear.xml"><span class="citerefentry"><span class="refentrytitle">glClear</span></span></a>,
<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>© 1991-2006 Silicon Graphics, Inc.
Copyright <span class="trademark"></span>© 2010-2013 Khronos Group.
This document is licensed under the SGI Free Software B License.
For details, see
<a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
</p></div></div></body></html>
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