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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
<refentry id="glBlendColor">
<refentryinfo>
<copyright>
<year>1991-2006</year>
<holder>Silicon Graphics, Inc.</holder>
</copyright>
<copyright>
<year>2010-2013</year>
<holder>Khronos Group</holder>
</copyright>
</refentryinfo>
<refmeta>
<refentrytitle>glBlendColor</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glBlendColor</refname>
<refpurpose>set the blend color</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glBlendColor</function></funcdef>
<paramdef>GLfloat <parameter>red</parameter></paramdef>
<paramdef>GLfloat <parameter>green</parameter></paramdef>
<paramdef>GLfloat <parameter>blue</parameter></paramdef>
<paramdef>GLfloat <parameter>alpha</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>red</parameter></term>
<term><parameter>green</parameter></term>
<term><parameter>blue</parameter></term>
<term><parameter>alpha</parameter></term>
<listitem>
<para>
specify the components of <constant>GL_BLEND_COLOR</constant>
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="description"><title>Description</title>
<para>
The <constant>GL_BLEND_COLOR</constant> may be used to calculate the source and destination
blending factors. The color components are clamped to the range
<inlineequation><mml:math>
<!-- eqn: [0,1]: -->
<mml:mfenced open="[" close="]">
<mml:mn>0</mml:mn>
<mml:mn>1</mml:mn>
</mml:mfenced>
</mml:math></inlineequation>
before being stored. See <citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry> for a complete description of the
blending operations.
Initially the <constant>GL_BLEND_COLOR</constant> is set to (0, 0, 0, 0).
</para>
</refsect1>
<refsect1 id="notes"><title>Notes</title>
<para>
The type of the <parameter>red</parameter>,
<parameter>green</parameter>, <parameter>blue</parameter>,
and <parameter>alpha</parameter> parameters was changed from
GLclampf to GLfloat. This change is transparent to user code
and is described in detail on the
<citerefentry><refentrytitle>removedTypes</refentrytitle></citerefentry>
page.
</para>
</refsect1>
<refsect1 id="associatedgets"><title>Associated Gets</title>
<para>
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with an argument of <constant>GL_BLEND_COLOR</constant>
</para>
</refsect1>
<refsect1 id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glBlendEquation</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>removedTypes</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"></trademark> 1991-2006 Silicon Graphics, Inc.
Copyright <trademark class="copyright"></trademark> 2010-2013 Khronos Group.
This document is licensed under the SGI Free Software B License.
For details, see
<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
</para>
</refsect1>
</refentry>
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