mirror of
https://github.com/Ryujinx/Opentk.git
synced 2025-01-06 22:05:40 +00:00
1482 lines
78 KiB
XML
1482 lines
78 KiB
XML
<?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">
|
|
<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>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>
|
|
<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>
|
|
<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>
|
|
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>
|
|
<tgroup cols="3" align="left">
|
|
<colspec colwidth="3*" />
|
|
<colspec colwidth="2*" />
|
|
<colspec colwidth="1*" />
|
|
<thead>
|
|
<row>
|
|
<entry>
|
|
<emphasis role="bold"> Parameter </emphasis>
|
|
</entry>
|
|
<entry>
|
|
<emphasis role="bold"> RGB Factor </emphasis>
|
|
</entry>
|
|
<entry>
|
|
<emphasis role="bold"> Alpha Factor </emphasis>
|
|
</entry>
|
|
</row>
|
|
</thead>
|
|
<tbody>
|
|
<row>
|
|
<entry> <constant>GL_ZERO</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 0: -->
|
|
<mml:mn>0</mml:mn>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry> <constant>GL_ONE</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 1: -->
|
|
<mml:mn>1</mml:mn>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry> <constant>GL_SRC_COLOR</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_ONE_MINUS_SRC_COLOR</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_DST_COLOR</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_ONE_MINUS_DST_COLOR</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_SRC_ALPHA</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_ONE_MINUS_SRC_ALPHA</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_DST_ALPHA</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_ONE_MINUS_DST_ALPHA</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_CONSTANT_COLOR</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_ONE_MINUS_CONSTANT_COLOR</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_CONSTANT_ALPHA</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_ONE_MINUS_CONSTANT_ALPHA</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_SRC_ALPHA_SATURATE</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: 1: -->
|
|
<mml:mn>1</mml:mn>
|
|
</mml:math></inlineequation>
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry> <constant>GL_SRC1_COLOR</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_ONE_MINUS_SRC_COLOR</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_SRC1_ALPHA</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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> <constant>GL_ONE_MINUS_SRC_ALPHA</constant> </entry>
|
|
<entry>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
To determine the blended RGBA values of a pixel,
|
|
the system uses the following equations:
|
|
</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>
|
|
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>
|
|
<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>
|
|
</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.
|
|
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>
|