--- /dev/null
+<?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="glBlendFuncSeparate">
+ <refmeta>
+ <refmetainfo>
+ <copyright>
+ <year>1991-2006</year>
+ <holder>Silicon Graphics, Inc.</holder>
+ </copyright>
+ </refmetainfo>
+ <refentrytitle>glBlendFuncSeparate</refentrytitle>
+ <manvolnum>3G</manvolnum>
+ </refmeta>
+ <refnamediv>
+ <refname>glBlendFuncSeparate</refname>
+ <refpurpose>specify pixel arithmetic for RGB and alpha components separately</refpurpose>
+ </refnamediv>
+ <refsynopsisdiv><title>C Specification</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>void <function>glBlendFuncSeparate</function></funcdef>
+ <paramdef>GLenum <parameter>srcRGB</parameter></paramdef>
+ <paramdef>GLenum <parameter>dstRGB</parameter></paramdef>
+ <paramdef>GLenum <parameter>srcAlpha</parameter></paramdef>
+ <paramdef>GLenum <parameter>dstAlpha</parameter></paramdef>
+ </funcprototype>
+ <funcprototype>
+ <funcdef>void <function>glBlendFuncSeparatei</function></funcdef>
+ <paramdef>GLuint <parameter>buf</parameter></paramdef>
+ <paramdef>GLenum <parameter>srcRGB</parameter></paramdef>
+ <paramdef>GLenum <parameter>dstRGB</parameter></paramdef>
+ <paramdef>GLenum <parameter>srcAlpha</parameter></paramdef>
+ <paramdef>GLenum <parameter>dstAlpha</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+ <!-- eqn: ignoring delim $$ -->
+ <refsect1 id="parameters"><title>Parameters</title>
+ <variablelist>
+ <varlistentry>
+ <term><parameter>buf</parameter></term>
+ <listitem>
+ <para>
+ For <function>glBlendFuncSeparatei</function>, specifies the index of the draw
+ buffer for which to set the blend functions.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><parameter>srcRGB</parameter></term>
+ <listitem>
+ <para>
+ Specifies how the red, green, and blue blending factors are computed.
+ The initial value is <constant>GL_ONE</constant>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><parameter>dstRGB</parameter></term>
+ <listitem>
+ <para>
+ Specifies how the red, green, and blue destination blending factors are
+ computed.
+ The initial value is <constant>GL_ZERO</constant>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><parameter>srcAlpha</parameter></term>
+ <listitem>
+ <para>
+ Specified how the alpha source blending factor is computed.
+ The initial value is <constant>GL_ONE</constant>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><parameter>dstAlpha</parameter></term>
+ <listitem>
+ <para>
+ Specified how the alpha destination blending factor is computed.
+ The initial value is <constant>GL_ZERO</constant>.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+ <refsect1 id="description"><title>Description</title>
+ <para>
+ Pixels can be drawn using a function that blends
+ the incoming (source) RGBA values with the RGBA values
+ that are already in the frame buffer (the destination values).
+ Blending is initially disabled.
+ Use <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glDisable</refentrytitle></citerefentry> with argument <constant>GL_BLEND</constant>
+ to enable and disable blending.
+ </para>
+ <para>
+ <function>glBlendFuncSeparate</function> defines the operation of blending for all draw buffers when it is enabled.
+ <function>glBlendFuncSeparatei</function> defines the operation of blending for a single draw buffer
+ specified by <parameter>buf</parameter> when enabled for that draw buffer.
+ <parameter>srcRGB</parameter> specifies which method is used to scale the
+ source RGB-color components.
+ <parameter>dstRGB</parameter> specifies which method is used to scale the
+ destination RGB-color components.
+ Likewise, <parameter>srcAlpha</parameter> specifies which method is used to scale the source alpha
+ color component, and <parameter>dstAlpha</parameter> specifies which method is used to scale the
+ destination alpha component.
+ The possible methods are described in the following table.
+ Each method defines four scale factors,
+ one each for red, green, blue, and alpha.
+ </para>
+ <para>
+ In the table and in subsequent equations, first source, second source and destination
+ color components are referred to as
+ <inlineequation><mml:math>
+ <!-- eqn: ( R sub s0 , G sub s0 , B sub s0 , A sub s0 ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:math></inlineequation>,
+ <inlineequation><mml:math>
+ <!-- eqn: ( R sub s1 , G sub s1 , B sub s1 , A sub s1 ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:math></inlineequation>,
+ and
+ <inlineequation><mml:math>
+ <!-- eqn: ( R sub d , G sub d , B sub d , A sub d ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:math></inlineequation>, respectively.
+ The color specified by <citerefentry><refentrytitle>glBlendColor</refentrytitle></citerefentry> is referred to as
+ <inlineequation><mml:math>
+ <!-- eqn: ( R sub c , G sub c , B sub c , A sub c ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:math></inlineequation>.
+ They are understood to have integer values between 0 and
+ <inlineequation><mml:math>
+ <!-- eqn: ( k sub R , k sub G , k sub B , k sub A ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:math></inlineequation>,
+ where
+ </para>
+ <para>
+ <para>
+ <inlineequation><mml:math>
+ <!-- eqn: k sub c = 2 sup {m sub c} - 1: -->
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ <mml:mo>=</mml:mo>
+ <mml:mrow>
+ <mml:msup><mml:mn>2</mml:mn>
+ <mml:mfenced open="" close="">
+ <mml:msub><mml:mi mathvariant="italic">m</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:msup>
+ <mml:mo>-</mml:mo>
+ <mml:mn>1</mml:mn>
+ </mml:mrow>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </para>
+ </para>
+ <para>
+ and
+ <inlineequation><mml:math>
+ <!-- eqn: ( m sub R , m sub G , m sub B , m sub A ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">m</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">m</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">m</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">m</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ is the number of red,
+ green,
+ blue,
+ and alpha bitplanes.
+ </para>
+ <para>
+ Source and destination scale factors are referred to as
+ <inlineequation><mml:math>
+ <!-- eqn: ( s sub R , s sub G , s sub B , s sub A ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">s</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">s</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">s</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">s</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ and
+ <inlineequation><mml:math>
+ <!-- eqn: ( d sub R , d sub G , d sub B , d sub A ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">d</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">d</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">d</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">d</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:math></inlineequation>.
+ All scale factors have 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>.
+ </para>
+ <para>
+ </para>
+ <informaltable frame="topbot">
+ <tgroup cols="3" align="left">
+ <colspec colwidth="3*" />
+ <colspec colwidth="2*" />
+ <colspec colwidth="1*" />
+ <thead>
+ <row>
+ <entry rowsep="1" align="left"><emphasis role="bold">
+ Parameter
+ </emphasis></entry>
+ <entry rowsep="1" align="left"><emphasis role="bold">
+ RGB Factor
+ </emphasis></entry>
+ <entry rowsep="1" align="left"><emphasis role="bold">
+ Alpha Factor
+ </emphasis></entry>
+ </row>
+ </thead>
+ <tbody>
+ <row>
+ <entry align="left">
+ <constant>GL_ZERO</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( 0, 0, 0 ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:mn>0</mml:mn>
+ <mml:mn>0</mml:mn>
+ <mml:mn>0</mml:mn>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: 0: -->
+ <mml:mn>0</mml:mn>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_ONE</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( 1, 1, 1 ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: 1: -->
+ <mml:mn>1</mml:mn>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_SRC_COLOR</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( R sub s0 / k sub R , G sub s0 / k sub G , B sub s0 / k sub B ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: A sub s0 / k sub A: -->
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_ONE_MINUS_SRC_COLOR</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( 1, 1, 1, 1 ) - ( R sub s0 / k sub R , G sub s0 / k sub G , B sub 0s / k sub B ): -->
+ <mml:mrow>
+ <mml:mfenced open="(" close=")">
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ </mml:mfenced>
+ <mml:mo>-</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: 1 - A sub s0 / k sub A: -->
+ <mml:mrow>
+ <mml:mn>1</mml:mn>
+ <mml:mo>-</mml:mo>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_DST_COLOR</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( R sub d / k sub R , G sub d / k sub G , B sub d / k sub B ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: A sub d / k sub A: -->
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_ONE_MINUS_DST_COLOR</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( 1, 1, 1 ) - ( R sub d / k sub R , G sub d / k sub G , B sub d / k sub B ): -->
+ <mml:mrow>
+ <mml:mfenced open="(" close=")">
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ </mml:mfenced>
+ <mml:mo>-</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: 1 - A sub d / k sub A: -->
+ <mml:mrow>
+ <mml:mn>1</mml:mn>
+ <mml:mo>-</mml:mo>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_SRC_ALPHA</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( A sub s0 / k sub A , A sub s0 / k sub A , A sub s0 / k sub A ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: A sub s / k sub A: -->
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_ONE_MINUS_SRC_ALPHA</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( 1, 1, 1 ) - ( A sub s0 / k sub A , A sub s0 / k sub A , A sub s0 / k sub A ): -->
+ <mml:mrow>
+ <mml:mfenced open="(" close=")">
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ </mml:mfenced>
+ <mml:mo>-</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: 1 - A sub s / k sub A: -->
+ <mml:mrow>
+ <mml:mn>1</mml:mn>
+ <mml:mo>-</mml:mo>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s0</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_DST_ALPHA</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( A sub d / k sub A , A sub d / k sub A , A sub d / k sub A ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: A sub d / k sub A: -->
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_ONE_MINUS_DST_ALPHA</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( 1, 1, 1 ) - ( A sub d / k sub A , A sub d / k sub A , A sub d / k sub A ): -->
+ <mml:mrow>
+ <mml:mfenced open="(" close=")">
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ </mml:mfenced>
+ <mml:mo>-</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: 1 - A sub d / k sub A: -->
+ <mml:mrow>
+ <mml:mn>1</mml:mn>
+ <mml:mo>-</mml:mo>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_CONSTANT_COLOR</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( R sub c, G sub c, B sub c ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: A sub c: -->
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_ONE_MINUS_CONSTANT_COLOR</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( 1, 1, 1 ) - ( R sub c, G sub c, B sub c ): -->
+ <mml:mrow>
+ <mml:mfenced open="(" close=")">
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ </mml:mfenced>
+ <mml:mo>-</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: 1 - A sub c: -->
+ <mml:mrow>
+ <mml:mn>1</mml:mn>
+ <mml:mo>-</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_CONSTANT_ALPHA</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( A sub c, A sub c, A sub c ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: A sub c: -->
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_ONE_MINUS_CONSTANT_ALPHA</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( 1, 1, 1 ) - ( A sub c, A sub c, A sub c ): -->
+ <mml:mrow>
+ <mml:mfenced open="(" close=")">
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ </mml:mfenced>
+ <mml:mo>-</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: 1 - A sub c: -->
+ <mml:mrow>
+ <mml:mn>1</mml:mn>
+ <mml:mo>-</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">c</mml:mi>
+ </mml:msub>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_SRC_ALPHA_SATURATE</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( i, i, i ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:mi mathvariant="italic">i</mml:mi>
+ <mml:mi mathvariant="italic">i</mml:mi>
+ <mml:mi mathvariant="italic">i</mml:mi>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: 1: -->
+ <mml:mn>1</mml:mn>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_SRC1_COLOR</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( R sub s1 / k sub R , G sub s1 / k sub G , B sub s1 / k sub B ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: A sub s0 / k sub A: -->
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_ONE_MINUS_SRC_COLOR</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( 1, 1, 1, 1 ) - ( R sub s1 / k sub R , G sub s1 / k sub G , B sub s1 / k sub B ): -->
+ <mml:mrow>
+ <mml:mfenced open="(" close=")">
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ </mml:mfenced>
+ <mml:mo>-</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: 1 - A sub s0 / k sub A: -->
+ <mml:mrow>
+ <mml:mn>1</mml:mn>
+ <mml:mo>-</mml:mo>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_SRC1_ALPHA</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( A sub s1 / k sub A , A sub s1 / k sub A , A sub s1 / k sub A ): -->
+ <mml:mfenced open="(" close=")">
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mfenced>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: A sub s1 / k sub A: -->
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ <row>
+ <entry align="left">
+ <constant>GL_ONE_MINUS_SRC_ALPHA</constant>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: ( 1, 1, 1 ) - ( A sub s1 / k sub A , A sub s1 / k sub A , A sub s1 / k sub A ): -->
+ <mml:mrow>
+ <mml:mfenced open="(" close=")">
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ <mml:mn>1</mml:mn>
+ </mml:mfenced>
+ <mml:mo>-</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ <entry align="left">
+ <inlineequation><mml:math>
+ <!-- eqn: 1 - A sub s1 / k sub A: -->
+ <mml:mrow>
+ <mml:mn>1</mml:mn>
+ <mml:mo>-</mml:mo>
+ <mml:mfrac>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s1</mml:mi>
+ </mml:msub>
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mfrac>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </informaltable>
+ <para>
+ In the table,
+ </para>
+ <para>
+ <para>
+ <inlineequation><mml:math>
+ <!-- eqn: i = min (A sub s , 1 - {A sub d}): -->
+ <mml:mrow>
+ <mml:mi mathvariant="italic">i</mml:mi>
+ <mml:mo>=</mml:mo>
+ <mml:mrow>
+ <mml:mi mathvariant="italic">min</mml:mi>
+ <mml:mo>⁡</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s</mml:mi>
+ </mml:msub>
+ <mml:mrow>
+ <mml:mn>1</mml:mn>
+ <mml:mo>-</mml:mo>
+ <mml:mfenced open="" close="">
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </para>
+ </para>
+ <para>
+ To determine the blended RGBA values of a pixel,
+ the system uses the following equations:
+ </para>
+ <para>
+ <para>
+ <inlineequation><mml:math>
+ <!-- eqn: R sub d = min ( k sub R, R sub s s sub R + R sub d d sub R ): -->
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:mo>=</mml:mo>
+ <mml:mrow>
+ <mml:mi mathvariant="italic">min</mml:mi>
+ <mml:mo>⁡</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">s</mml:mi>
+ </mml:msub>
+ <mml:mo>⁢</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">s</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ <mml:mo>+</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:mo>⁢</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">d</mml:mi>
+ <mml:mi mathvariant="italic">R</mml:mi>
+ </mml:msub>
+ </mml:mrow>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ <inlineequation><mml:math>
+ <!-- eqn: G sub d = min ( k sub G, G sub s s sub G + G sub d d sub G ): -->
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:mo>=</mml:mo>
+ <mml:mrow>
+ <mml:mi mathvariant="italic">min</mml:mi>
+ <mml:mo>⁡</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">s</mml:mi>
+ </mml:msub>
+ <mml:mo>⁢</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">s</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ <mml:mo>+</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:mo>⁢</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">d</mml:mi>
+ <mml:mi mathvariant="italic">G</mml:mi>
+ </mml:msub>
+ </mml:mrow>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ <inlineequation><mml:math>
+ <!-- eqn: B sub d = min ( k sub B, B sub s s sub B + B sub d d sub B ): -->
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:mo>=</mml:mo>
+ <mml:mrow>
+ <mml:mi mathvariant="italic">min</mml:mi>
+ <mml:mo>⁡</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">s</mml:mi>
+ </mml:msub>
+ <mml:mo>⁢</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">s</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ <mml:mo>+</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:mo>⁢</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">d</mml:mi>
+ <mml:mi mathvariant="italic">B</mml:mi>
+ </mml:msub>
+ </mml:mrow>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ <inlineequation><mml:math>
+ <!-- eqn: A sub d = min ( k sub A, A sub s s sub A + A sub d d sub A ): -->
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:mo>=</mml:mo>
+ <mml:mrow>
+ <mml:mi mathvariant="italic">min</mml:mi>
+ <mml:mo>⁡</mml:mo>
+ <mml:mfenced open="(" close=")">
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s</mml:mi>
+ </mml:msub>
+ <mml:mo>⁢</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">s</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ <mml:mo>+</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:mo>⁢</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">d</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:mrow>
+ </mml:mfenced>
+ </mml:mrow>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </para>
+ </para>
+ <para>
+ Despite the apparent precision of the above equations, blending arithmetic
+ is not exactly specified, because blending operates with imprecise integer
+ color values. However, a blend factor that should be equal to 1 is
+ guaranteed not to modify its multiplicand, and a blend factor equal to 0
+ reduces its multiplicand to 0. For example, when <parameter>srcRGB</parameter> is
+ <constant>GL_SRC_ALPHA</constant>, <parameter>dstRGB</parameter> is <constant>GL_ONE_MINUS_SRC_ALPHA</constant>, and
+ <inlineequation><mml:math>
+ <!-- eqn: A sub s: -->
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s</mml:mi>
+ </mml:msub>
+ </mml:math></inlineequation>
+ is
+ equal to
+ <inlineequation><mml:math>
+ <!-- eqn: k sub A: -->
+ <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:math></inlineequation>,
+ the equations reduce to simple replacement:
+ </para>
+ <para>
+ <para>
+ <inlineequation><mml:math>
+ <!-- eqn: R sub d = R sub s: -->
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:mo>=</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
+ <mml:mi mathvariant="italic">s</mml:mi>
+ </mml:msub>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ <inlineequation><mml:math>
+ <!-- eqn: G sub d = G sub s: -->
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:mo>=</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">G</mml:mi>
+ <mml:mi mathvariant="italic">s</mml:mi>
+ </mml:msub>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ <inlineequation><mml:math>
+ <!-- eqn: B sub d = B sub s: -->
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:mo>=</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
+ <mml:mi mathvariant="italic">s</mml:mi>
+ </mml:msub>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ <inlineequation><mml:math>
+ <!-- eqn: A sub d = A sub s: -->
+ <mml:mrow>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">d</mml:mi>
+ </mml:msub>
+ <mml:mo>=</mml:mo>
+ <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
+ <mml:mi mathvariant="italic">s</mml:mi>
+ </mml:msub>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ </para>
+ </para>
+ <para>
+ </para>
+ </refsect1>
+ <refsect1 id="notes"><title>Notes</title>
+ <para>
+ Incoming (source) alpha is correctly thought of as a material opacity,
+ ranging from 1.0
+ (<inlineequation><mml:math>
+ <!-- eqn: K sub A: -->
+ <mml:msub><mml:mi mathvariant="italic">K</mml:mi>
+ <mml:mi mathvariant="italic">A</mml:mi>
+ </mml:msub>
+ </mml:math></inlineequation>),
+ representing complete opacity,
+ to 0.0 (0), representing complete
+ transparency.
+ </para>
+ <para>
+ When more than one color buffer is enabled for drawing,
+ the GL performs blending separately for each enabled buffer,
+ using the contents of that buffer for destination color.
+ (See <citerefentry><refentrytitle>glDrawBuffer</refentrytitle></citerefentry>.)
+ </para>
+ <para>
+ When dual source blending is enabled (i.e., one of the blend factors requiring
+ the second color input is used), the maximum number of enabled draw buffers
+ is given by <constant>GL_MAX_DUAL_SOURCE_DRAW_BUFFERS</constant>, which may
+ be lower than <constant>GL_MAX_DRAW_BUFFERS</constant>.
+ </para>
+ </refsect1>
+ <refsect1 id="errors"><title>Errors</title>
+ <para>
+ <constant>GL_INVALID_ENUM</constant> is generated if either <parameter>srcRGB</parameter> or <parameter>dstRGB</parameter> is not an
+ accepted value.
+ </para>
+ <para>
+ <constant>GL_INVALID_VALUE</constant> is generated by <function>glBlendFuncSeparatei</function> if <parameter>buf</parameter> is greater
+ than or equal to the value of <constant>GL_MAX_DRAW_BUFFERS</constant>.
+ </para>
+ </refsect1>
+ <refsect1 id="associatedgets"><title>Associated Gets</title>
+ <para>
+ <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_BLEND_SRC_RGB</constant>
+ </para>
+ <para>
+ <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_BLEND_SRC_ALPHA</constant>
+ </para>
+ <para>
+ <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_BLEND_DST_RGB</constant>
+ </para>
+ <para>
+ <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_BLEND_DST_ALPHA</constant>
+ </para>
+ <para>
+ <citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_BLEND</constant>
+ </para>
+ <para>
+ </para>
+ </refsect1>
+ <refsect1 id="seealso"><title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>glBlendColor</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glBlendEquation</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glClear</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glDrawBuffer</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glLogicOp</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry>
+ </para>
+ </refsect1>
+ <refsect1 id="Copyright"><title>Copyright</title>
+ <para>
+ Copyright <trademark class="copyright"></trademark> 1991-2006
+ Silicon Graphics, Inc. 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>
HCoop / clinton / guile-figl.git / blobdiff