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[clinton/guile-figl.git] / upstream-doc / man2 / xhtml / glClearAccum.xml
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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd">
+<!-- saved from url=(0013)about:internet -->
+<?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>
+                    Specify the red, green, blue, and alpha values used when the
+                    accumulation buffer is 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">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>
+            to clear the accumulation buffer.
+        </p><p>
+            Values specified by <code class="function">glClearAccum</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>-1</mml:mn>
+                    <mml:mn>1</mml:mn>
+                </mml:mfenced>
+            </mml: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">glClearAccum</code>
+            is executed between the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a>
+            and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><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.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_ACCUM_CLEAR_VALUE</code>
+        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
+            <a class="citerefentry" href="glAccum.xml"><span class="citerefentry"><span class="refentrytitle">glAccum</span></span></a>,
+            <a class="citerefentry" href="glClear.xml"><span class="citerefentry"><span class="refentrytitle">glClear</span></span></a>
+        </p></div><div class="refsect1" lang="en" xml:lang="en"><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>