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<?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" /><title>glColorMask</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glColorMask"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glColorMask — enable and disable writing of frame buffer color components</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">glColorMask</strong>(</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"><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 whether red, green, blue, and alpha can or cannot be written
                    into the frame buffer.
                    The initial values are all <code class="constant">GL_TRUE</code>,
                    indicating that the color components can be written.
                </p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
            <code class="function">glColorMask</code> specifies whether the individual color components in the frame 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 any of the
            color buffers,
            regardless of the drawing operation attempted.
        </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"><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_WRITEMASK</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="glDepthMask.xml"><span class="citerefentry"><span class="refentrytitle">glDepthMask</span></span></a>,
            <a class="citerefentry" href="glStencilMask.xml"><span class="citerefentry"><span class="refentrytitle">glStencilMask</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. 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>