<div class="refentry" lang="en" xml:lang="en"><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><tr><td><code class="funcdef">void <b class="fsfunc">glClearColor</b>(</code></td><td>GLclampf  </td><td><var class="pdparam">red</var>, </td></tr><tr><td> </td><td>GLclampf  </td><td><var class="pdparam">green</var>, </td></tr><tr><td> </td><td>GLclampf  </td><td><var class="pdparam">blue</var>, </td></tr><tr><td> </td><td>GLclampf  </td><td><var class="pdparam">alpha</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><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" lang="en" xml:lang="en"><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"><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

<math overflow="scroll">

<mfenced open="[" close="]">

<mn>0</mn>

<mn>1</mn>

</mfenced>

</math>.

</p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>

<code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glClearColor</code>

is executed between the execution of <a class="citerefentry" href="glBegin"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a>

and the corresponding execution of <a class="citerefentry" href="glEnd"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>.

</p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p>

<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_COLOR_CLEAR_VALUE</code>

</p></div>

{$pipelinestall}{$examples}

<div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>

<a class="citerefentry" href="glClear"><span class="citerefentry"><span class="refentrytitle">glClear</span></span></a>

</p></div><div class="refsect1" lang="en" xml:lang="en"><div id="Copyright"><h2>Copyright</h2><p>

Copyright © 1991-2006

Silicon Graphics, Inc. This document is licensed under the SGI

Free Software B License. For details, see

<a class="ulink" href="https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/" target="_top">https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/</a>.

</p></div></div></div>