| 1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
| 2 | <!-- saved from url=(0013)about:internet --> |
| 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>glClearColor</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><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 border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><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> |
| 4 | Specify the red, green, blue, and alpha values used when the |
| 5 | color buffers are 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">glClearColor</code> specifies the red, |
| 9 | green, |
| 10 | blue, |
| 11 | and alpha values used by <a class="citerefentry" href="glClear.xml"><span class="citerefentry"><span class="refentrytitle">glClear</span></span></a> to clear the color buffers. |
| 12 | Values specified by <code class="function">glClearColor</code> are clamped to the range |
| 13 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> |
| 14 | |
| 15 | <mml:mfenced open="[" close="]"> |
| 16 | <mml:mn>0</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">glClearColor</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_COLOR_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="glClear.xml"><span class="citerefentry"><span class="refentrytitle">glClear</span></span></a> |
| 28 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> |
| 29 | Copyright <span class="trademark"></span>© 1991-2006 |
| 30 | Silicon Graphics, Inc. This document is licensed under the SGI |
| 31 | Free Software B License. For details, see |
| 32 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. |
| 33 | </p></div></div></body></html> |