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3 <?xml-stylesheet type=
"text/xsl" href=
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pref=
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renderer=
"mathplayer-dl"><head><meta http-equiv=
"Content-Type" content=
"text/html; charset=UTF-8" /><title>glBlendColor
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glBlendColor"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glBlendColor — set the blend color
</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">glBlendColor
</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 components of
<code class=
"constant">GL_BLEND_COLOR
</code>
5 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
6 The
<code class=
"constant">GL_BLEND_COLOR
</code> may be used to calculate the source and destination
7 blending factors. The color components are clamped to the range
8 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
10 <mml:mfenced open=
"[" close=
"]">
15 before being stored. See
<a class=
"citerefentry" href=
"glBlendFunc.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBlendFunc
</span></span></a> for a complete description of the
17 Initially the
<code class=
"constant">GL_BLEND_COLOR
</code> is set to (
0,
0,
0,
0).
18 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
19 <code class=
"function">glBlendColor
</code> is part of the
<code class=
"code">ARB_imaging
</code> subset.
<code class=
"function">glBlendColor
</code> is present only
20 if
<code class=
"code">ARB_imaging
</code> is returned when
<a class=
"citerefentry" href=
"glGetString.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetString
</span></span></a> is called with
21 <code class=
"constant">GL_EXTENSIONS
</code> as its argument.
22 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
23 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<code class=
"function">glBlendColor
</code> is executed
24 between the execution of
<a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a> and the corresponding
25 execution of
<a class=
"citerefentry" href=
"glEnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnd
</span></span></a>.
27 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"associatedgets"></a><h2>Associated Gets
</h2><p>
28 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with an argument of
<code class=
"constant">GL_BLEND_COLOR
</code>
29 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
30 <a class=
"citerefentry" href=
"glBlendEquation.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBlendEquation
</span></span></a>,
31 <a class=
"citerefentry" href=
"glBlendFunc.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBlendFunc
</span></span></a>,
32 <a class=
"citerefentry" href=
"glGetString.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetString
</span></span></a>
33 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
34 Copyright
<span class=
"trademark"></span>©
1991-
2006
35 Silicon Graphics, Inc. This document is licensed under the SGI
36 Free Software B License. For details, see
37 <a class=
"ulink" href=
"http://oss.sgi.com/projects/FreeB/" target=
"_top">http://oss.sgi.com/projects/FreeB/
</a>.
38 </p></div></div></body></html>