upstream-man-pages/man2/xhtml/glClearAccum.xml

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   3 <?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>glClearAccum</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glClearAccum"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glClearAccum — specify clear values for the accumulation buffer</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glClearAccum</b>(</code></td><td>GLfloat  </td><td><var class="pdparam">red</var>, </td></tr><tr><td> </td><td>GLfloat  </td><td><var class="pdparam">green</var>, </td></tr><tr><td> </td><td>GLfloat  </td><td><var class="pdparam">blue</var>, </td></tr><tr><td> </td><td>GLfloat  </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>
   4                     Specify the red, green, blue, and alpha values used when the
   5                     accumulation buffer is cleared.
   6                     The initial values are all 0.
   7                 </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
   8             <code class="function">glClearAccum</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>
   9             to clear the accumulation buffer.
  10         </p><p>
  11             Values specified by <code class="function">glClearAccum</code> are clamped to the
  12             range
  13             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
  14
  15                 <mml:mfenced open="[" close="]">
  16                     <mml:mn>-1</mml:mn>
  17                     <mml:mn>1</mml:mn>
  18                 </mml:mfenced>
  19             </mml:math>.
  20         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
  21             <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glClearAccum</code>
  22             is executed between the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a>
  23             and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>.
  24         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
  25             <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_ACCUM_CLEAR_VALUE</code>
  26         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
  27             <a class="citerefentry" href="glAccum.xml"><span class="citerefentry"><span class="refentrytitle">glAccum</span></span></a>,
  28             <a class="citerefentry" href="glClear.xml"><span class="citerefentry"><span class="refentrytitle">glClear</span></span></a>
  29         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
  30             Copyright <span class="trademark"></span>© 1991-2006
  31             Silicon Graphics, Inc. This document is licensed under the SGI
  32             Free Software B License. For details, see
  33             <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
  34         </p></div></div></body></html>