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-<?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><link rel="stylesheet" type="text/css" href="opengl-man.css" /><title>glBlendFuncSeparate</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glBlendFuncSeparate"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glBlendFuncSeparate — specify pixel arithmetic for RGB and alpha components separately</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glBlendFuncSeparate</b>(</code></td><td>GLenum </td><td><var class="pdparam">srcRGB</var>, </td></tr><tr><td> </td><td>GLenum </td><td><var class="pdparam">dstRGB</var>, </td></tr><tr><td> </td><td>GLenum </td><td><var class="pdparam">srcAlpha</var>, </td></tr><tr><td> </td><td>GLenum </td><td><var class="pdparam">dstAlpha</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>srcRGB</code></em></span></dt><dd><p>
- Specifies how the red, green, and blue blending factors are computed.
- The initial value is <code class="constant">GL_ONE</code>.
- </p></dd><dt><span class="term"><em class="parameter"><code>dstRGB</code></em></span></dt><dd><p>
- Specifies how the red, green, and blue destination blending factors are
- computed.
- The initial value is <code class="constant">GL_ZERO</code>.
- </p></dd><dt><span class="term"><em class="parameter"><code>srcAlpha</code></em></span></dt><dd><p>
- Specified how the alpha source blending factor is computed.
- The initial value is <code class="constant">GL_ONE</code>.
- </p></dd><dt><span class="term"><em class="parameter"><code>dstAlpha</code></em></span></dt><dd><p>
- Specified how the alpha destination blending factor is computed.
- The initial value is <code class="constant">GL_ZERO</code>.
- </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
- 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 <a href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a> and <a href="glDisable.xml"><span class="citerefentry"><span class="refentrytitle">glDisable</span></span></a> with argument <code class="constant">GL_BLEND</code>
- to enable and disable blending.
- </p><p>
- <code class="function">glBlendFuncSeparate</code> defines the operation of blending when it is enabled.
- <em class="parameter"><code>srcRGB</code></em> specifies which method is used to scale the
- source RGB-color components.
- <em class="parameter"><code>dstRGB</code></em> specifies which method is used to scale the
- destination RGB-color components.
- Likewise, <em class="parameter"><code>srcAlpha</code></em> specifies which method is used to scale the source alpha
- color component, and <em class="parameter"><code>dstAlpha</code></em> 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.
- </p><p>
- In the table and in subsequent equations, first source, second source and destination
- color components are referred to as
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>,
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>,
- and
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>, respectively.
- The color specified by <a href="glBlendColor.xml"><span class="citerefentry"><span class="refentrytitle">glBlendColor</span></span></a> is referred to as
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>.
- They are understood to have integer values between 0 and
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>,
- where
- </p><p>
- </p><p>
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </p><p>
- </p><p>
- and
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- is the number of red,
- green,
- blue,
- and alpha bitplanes.
- </p><p>
- Source and destination scale factors are referred to as
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- and
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>.
- All scale factors have range
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <mml:mfenced open="[" close="]">
- <mml:mn>0</mml:mn>
- <mml:mn>1</mml:mn>
- </mml:mfenced>
- </mml:math>.
- </p><p>
- </p><div class="informaltable"><table border="1"><colgroup><col align="left" /><col align="left" /><col align="left" /></colgroup><thead><tr><th align="left"><span class="bold"><strong>
- Parameter
- </strong></span></th><th align="left"><span class="bold"><strong>
- RGB Factor
- </strong></span></th><th align="left"><span class="bold"><strong>
- Alpha Factor
- </strong></span></th></tr></thead><tbody><tr><td align="left">
- <code class="constant">GL_ZERO</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <mml:mfenced open="(" close=")">
- <mml:mn>0</mml:mn>
- <mml:mn>0</mml:mn>
- <mml:mn>0</mml:mn>
- </mml:mfenced>
- </mml:math>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <mml:mn>0</mml:mn>
- </mml:math>
- </td></tr><tr><td align="left">
- <code class="constant">GL_ONE</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <mml:mfenced open="(" close=")">
- <mml:mn>1</mml:mn>
- <mml:mn>1</mml:mn>
- <mml:mn>1</mml:mn>
- </mml:mfenced>
- </mml:math>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <mml:mn>1</mml:mn>
- </mml:math>
- </td></tr><tr><td align="left">
- <code class="constant">GL_SRC_COLOR</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_ONE_MINUS_SRC_COLOR</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_DST_COLOR</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_ONE_MINUS_DST_COLOR</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_SRC_ALPHA</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_ONE_MINUS_SRC_ALPHA</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_DST_ALPHA</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_ONE_MINUS_DST_ALPHA</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_CONSTANT_COLOR</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
- <mml:mi mathvariant="italic">c</mml:mi>
- </mml:msub>
- </mml:math>
- </td></tr><tr><td align="left">
- <code class="constant">GL_ONE_MINUS_CONSTANT_COLOR</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_CONSTANT_ALPHA</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
- <mml:mi mathvariant="italic">c</mml:mi>
- </mml:msub>
- </mml:math>
- </td></tr><tr><td align="left">
- <code class="constant">GL_ONE_MINUS_CONSTANT_ALPHA</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_SRC_ALPHA_SATURATE</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <mml:mn>1</mml:mn>
- </mml:math>
- </td></tr><tr><td align="left">
- <code class="constant">GL_SRC1_COLOR</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_ONE_MINUS_SRC_COLOR</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_SRC1_ALPHA</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr><tr><td align="left">
- <code class="constant">GL_ONE_MINUS_SRC_ALPHA</code>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td><td align="left">
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </td></tr></tbody></table></div><p>
- In the table,
- </p><p>
- </p><p>
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </p><p>
- </p><p>
- To determine the blended RGBA values of a pixel,
- the system uses the following equations:
- </p><p>
- </p><p>
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </p><p>
- </p><p>
- 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 <em class="parameter"><code>srcRGB</code></em> is
- <code class="constant">GL_SRC_ALPHA</code>, <em class="parameter"><code>dstRGB</code></em> is <code class="constant">GL_ONE_MINUS_SRC_ALPHA</code>, and
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <mml:msub><mml:mi mathvariant="italic">A</mml:mi>
- <mml:mi mathvariant="italic">s</mml:mi>
- </mml:msub>
- </mml:math>
- is
- equal to
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <mml:msub><mml:mi mathvariant="italic">k</mml:mi>
- <mml:mi mathvariant="italic">A</mml:mi>
- </mml:msub>
- </mml:math>,
- the equations reduce to simple replacement:
- </p><p>
- </p><p>
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <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>
- </p><p>
- </p><p>
- </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
- Incoming (source) alpha is correctly thought of as a material opacity,
- ranging from 1.0
- (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
-
- <mml:msub><mml:mi mathvariant="italic">K</mml:mi>
- <mml:mi mathvariant="italic">A</mml:mi>
- </mml:msub>
- </mml:math>),
- representing complete opacity,
- to 0.0 (0), representing complete
- transparency.
- </p><p>
- 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 <a href="glDrawBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glDrawBuffer</span></span></a>.)
- </p><p>
- 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 <code class="constant">GL_MAX_DUAL_SOURCE_DRAW_BUFFERS</code>, which may
- be lower than <code class="constant">GL_MAX_DRAW_BUFFERS</code>.
- </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
- <code class="constant">GL_INVALID_ENUM</code> is generated if either <em class="parameter"><code>srcRGB</code></em> or <em class="parameter"><code>dstRGB</code></em> is not an
- accepted value.
- </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
- <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_BLEND_SRC_RGB</code>
- </p><p>
- <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_BLEND_SRC_ALPHA</code>
- </p><p>
- <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_BLEND_DST_RGB</code>
- </p><p>
- <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_BLEND_DST_ALPHA</code>
- </p><p>
- <a href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_BLEND</code>
- </p><p>
- </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
- <a href="glBlendColor.xml"><span class="citerefentry"><span class="refentrytitle">glBlendColor</span></span></a>,
- <a href="glBlendFunc.xml"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a>,
- <a href="glBlendEquation.xml"><span class="citerefentry"><span class="refentrytitle">glBlendEquation</span></span></a>,
- <a href="glClear.xml"><span class="citerefentry"><span class="refentrytitle">glClear</span></span></a>,
- <a href="glDrawBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glDrawBuffer</span></span></a>,
- <a href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>,
- <a href="glLogicOp.xml"><span class="citerefentry"><span class="refentrytitle">glLogicOp</span></span></a>,
- <a href="glStencilFunc.xml"><span class="citerefentry"><span class="refentrytitle">glStencilFunc</span></span></a>
- </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
- Copyright <span class="trademark"></span>© 1991-2006
- Silicon Graphics, Inc. This document is licensed under the SGI
- Free Software B License. For details, see
- <a href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
- </p></div></div></body></html>
HCoop / clinton / guile-figl.git / blobdiff