<div class="refentry" title="glColorMask"><a id="glColorMask"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glColorMask — enable and disable writing of color buffer

components</p></div><div class="refsynopsisdiv" title="C Specification"><h2>C Specification</h2><div class="funcsynopsis"><table class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">glColorMask</b>(</code></td><td>GLboolean <var class="pdparam">red</var>, </td></tr><tr><td> </td><td>GLboolean <var class="pdparam">green</var>, </td></tr><tr><td> </td><td>GLboolean <var class="pdparam">blue</var>, </td></tr><tr><td> </td><td>GLboolean <var class="pdparam">alpha</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Parameters"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term">

<em class="parameter"><code>red</code></em>,

<em class="parameter"><code>green</code></em>,

<em class="parameter"><code>blue</code></em>,

<em class="parameter"><code>alpha</code></em>

</span></dt><dd><p>Specify whether red, green, blue, and alpha can or

cannot be written into the color buffer. The initial

values are all <code class="constant">GL_TRUE</code>,

indicating that all color components can be written.</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="description"></a><h2>Description</h2><p>

<code class="function">glColorMask</code>

specifies whether the individual components in the color

buffer can or cannot be written. If <em class="parameter"><code>red</code></em> is

<code class="constant">GL_FALSE</code>,

for example, no change is made to the red component of any

pixel in the color buffer, regardless of the drawing operation

attempted, including

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

</p><p>Changes to individual bits of components cannot be

controlled. Rather, changes are either enabled or disabled for

entire color components.</p></div><div class="refsect1" title="See Also"><a id="seealso"></a><h2>See Also</h2><p>

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

<a class="citerefentry" href="glColor"><span class="citerefentry"><span class="refentrytitle">glColor</span></span></a>,

<a class="citerefentry" href="glColorPointer"><span class="citerefentry"><span class="refentrytitle">glColorPointer</span></span></a>,

<a class="citerefentry" href="glDepthMask"><span class="citerefentry"><span class="refentrytitle">glDepthMask</span></span></a>,

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

</p></div><div class="refsect1" title="Copyright"><a id="copyright"></a><h2>Copyright</h2><p>

Copyright © 2003-2004

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>