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Opentk/Source/Bind/Specifications/Docs/glTexEnv.xml
the_fiddler 875263e46a Added support for inline OpenGL documentation.
2009-03-08 00:46:58 +00:00

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
<refentry id="glTexEnv">
<refmeta>
<refmetainfo>
<copyright>
<year>1991-2006</year>
<holder>Silicon Graphics, Inc.</holder>
</copyright>
</refmetainfo>
<refentrytitle>glTexEnv</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glTexEnv</refname>
<refpurpose>set texture environment parameters</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glTexEnvf</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLfloat <parameter>param</parameter></paramdef>
</funcprototype>
</funcsynopsis>
<para></para>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glTexEnvi</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLint <parameter>param</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<!-- eqn: ignoring delim $$ -->
<refsect1 id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>target</parameter></term>
<listitem>
<para>
Specifies a texture environment.
May be <constant>GL_TEXTURE_ENV</constant>, <constant>GL_TEXTURE_FILTER_CONTROL</constant> or <constant>GL_POINT_SPRITE</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>pname</parameter></term>
<listitem>
<para>
Specifies the symbolic name of a single-valued texture environment parameter.
May be either <constant>GL_TEXTURE_ENV_MODE</constant>, <constant>GL_TEXTURE_LOD_BIAS</constant>,
<constant>GL_COMBINE_RGB</constant>,
<constant>GL_COMBINE_ALPHA</constant>,
<constant>GL_SRC0_RGB</constant>,
<constant>GL_SRC1_RGB</constant>,
<constant>GL_SRC2_RGB</constant>,
<constant>GL_SRC0_ALPHA</constant>,
<constant>GL_SRC1_ALPHA</constant>,
<constant>GL_SRC2_ALPHA</constant>,
<constant>GL_OPERAND0_RGB</constant>,
<constant>GL_OPERAND1_RGB</constant>,
<constant>GL_OPERAND2_RGB</constant>,
<constant>GL_OPERAND0_ALPHA</constant>,
<constant>GL_OPERAND1_ALPHA</constant>,
<constant>GL_OPERAND2_ALPHA</constant>,
<constant>GL_RGB_SCALE</constant>,
<constant>GL_ALPHA_SCALE</constant>, or
<constant>GL_COORD_REPLACE</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>param</parameter></term>
<listitem>
<para>
Specifies a single symbolic constant, one of <constant>GL_ADD</constant>,
<constant>GL_ADD_SIGNED</constant>, <constant>GL_INTERPOLATE</constant>, <constant>GL_MODULATE</constant>, <constant>GL_DECAL</constant>,
<constant>GL_BLEND</constant>, <constant>GL_REPLACE</constant>, <constant>GL_SUBTRACT</constant>, <constant>GL_COMBINE</constant>,
<constant>GL_TEXTURE</constant>, <constant>GL_CONSTANT</constant>, <constant>GL_PRIMARY_COLOR</constant>, <constant>GL_PREVIOUS</constant>,
<constant>GL_SRC_COLOR</constant>, <constant>GL_ONE_MINUS_SRC_COLOR</constant>, <constant>GL_SRC_ALPHA</constant>,
<constant>GL_ONE_MINUS_SRC_ALPHA</constant>,
a single boolean value for the point sprite texture coordinate replacement,
a single floating-point value for the texture level-of-detail bias,
or 1.0, 2.0, or 4.0 when specifying the <constant>GL_RGB_SCALE</constant> or <constant>GL_ALPHA_SCALE</constant>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glTexEnvfv</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>const GLfloat * <parameter>params</parameter></paramdef>
</funcprototype>
</funcsynopsis>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glTexEnviv</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>const GLint * <parameter>params</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="parameters2"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>target</parameter></term>
<listitem>
<para>
Specifies a texture environment.
May be either <constant>GL_TEXTURE_ENV</constant>, or <constant>GL_TEXTURE_FILTER_CONTROL</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>pname</parameter></term>
<listitem>
<para>
Specifies the symbolic name of a texture environment parameter.
Accepted values are <constant>GL_TEXTURE_ENV_MODE</constant>, <constant>GL_TEXTURE_ENV_COLOR</constant>, or
<constant>GL_TEXTURE_LOD_BIAS</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>params</parameter></term>
<listitem>
<para>
Specifies a pointer to a parameter array that contains
either a single symbolic constant, single floating-point number, or an RGBA
color.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="description"><title>Description</title>
<para>
A texture environment specifies how texture values are interpreted when a
fragment is textured. When <parameter>target</parameter> is <constant>GL_TEXTURE_FILTER_CONTROL</constant>,
<parameter>pname</parameter> must be <constant>GL_TEXTURE_LOD_BIAS</constant>. When <parameter>target</parameter> is
<constant>GL_TEXTURE_ENV</constant>, <parameter>pname</parameter> can be <constant>GL_TEXTURE_ENV_MODE</constant>,
<constant>GL_TEXTURE_ENV_COLOR</constant>, <constant>GL_COMBINE_RGB</constant>, <constant>GL_COMBINE_ALPHA</constant>,
<constant>GL_RGB_SCALE</constant>, <constant>GL_ALPHA_SCALE</constant>,
<constant>GL_SRC0_RGB</constant>, <constant>GL_SRC1_RGB</constant>, <constant>GL_SRC2_RGB</constant>,
<constant>GL_SRC0_ALPHA</constant>, <constant>GL_SRC1_ALPHA</constant>, or <constant>GL_SRC2_ALPHA</constant>.
</para>
<para>
If <parameter>pname</parameter> is <constant>GL_TEXTURE_ENV_MODE</constant>,
then <parameter>params</parameter> is (or points to) the symbolic name of a texture function.
Six texture functions may be specified:
<constant>GL_ADD</constant>,
<constant>GL_MODULATE</constant>,
<constant>GL_DECAL</constant>,
<constant>GL_BLEND</constant>,
<constant>GL_REPLACE</constant>, or
<constant>GL_COMBINE</constant>.
</para>
<para>
The following table shows the correspondence of filtered texture
values
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">R</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">G</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">B</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">I</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>
to texture source components.
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi></mml:msub></mml:math></inlineequation>
and
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi></mml:msub></mml:math></inlineequation>
are used by the texture functions described below.
</para>
<para>
</para>
<informaltable frame="topbot">
<tgroup cols="3" align="left">
<colspec/>
<colspec/>
<thead>
<row>
<entry rowsep="1" align="left">
Texture Base Internal Format
</entry>
<entry rowsep="1" align="center">
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="bold-italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi></mml:msub></mml:math></inlineequation>
</entry>
<entry rowsep="1" align="center">
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="bold-italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi></mml:msub></mml:math></inlineequation>
</entry>
</row>
</thead>
<tbody>
<row>
<entry align="left">
<constant>GL_ALPHA</constant>
</entry>
<entry align="left">
(0, 0, 0)
</entry>
<entry align="left">
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_LUMINANCE</constant>
</entry>
<entry align="left">
(
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>
)
</entry>
<entry align="left">
1
</entry>
</row>
<row>
<entry align="left">
<constant>GL_LUMINANCE_ALPHA</constant>
</entry>
<entry align="left">
(
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">L</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>
)
</entry>
<entry align="left">
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_INTENSITY</constant>
</entry>
<entry align="left">
(
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">I</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">I</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">I</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>
)
</entry>
<entry align="left">
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">I</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_RGB</constant>
</entry>
<entry align="left">
(
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">R</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">G</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">B</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>
)
</entry>
<entry align="left">
1
</entry>
</row>
<row>
<entry align="left">
<constant>GL_RGBA</constant>
</entry>
<entry align="left">
(
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">R</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">G</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>,
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">B</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>
)
</entry>
<entry align="left">
<inlineequation><mml:math><mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">t</mml:mi></mml:msub></mml:math></inlineequation>
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
<para>
A texture function acts on the fragment to be textured using
the texture image value that applies to the fragment
(see <citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>)
and produces an RGBA color for that fragment.
The following table shows how the RGBA color is produced for each
of the first five texture functions that can be chosen.
<inlineequation><mml:math><mml:mi mathvariant="italic">C</mml:mi></mml:math></inlineequation>
is a triple of color values (RGB) and
<inlineequation><mml:math><mml:mi mathvariant="italic">A</mml:mi></mml:math></inlineequation>
is the associated alpha value.
RGBA values extracted from a texture image are in the range [0,1].
The subscript
<inlineequation><mml:math><mml:mi mathvariant="italic">p</mml:mi></mml:math></inlineequation>
refers to the color computed from the previous texture stage (or the incoming fragment if processing texture stage 0),
the subscript
<inlineequation><mml:math><mml:mi mathvariant="italic">s</mml:mi></mml:math></inlineequation>
to the texture source color,
the subscript
<inlineequation><mml:math><mml:mi mathvariant="italic">c</mml:mi></mml:math></inlineequation>
to the texture environment color,
and the subscript
<inlineequation><mml:math><mml:mi mathvariant="italic">v</mml:mi></mml:math></inlineequation>
indicates a value produced by the texture function.
</para>
<para>
</para>
<informaltable pgwide="1" font-size="8pt" frame="topbot">
<tgroup cols="7" align="left">
<colspec colwidth="4.1*" align="center"/>
<colspec colwidth="1*" align="center"/>
<colspec colwidth="2.3*" align="center"/>
<colspec colwidth="2.7*" />
<colspec colwidth="3.4*" />
<colspec colwidth="3.5*" />
<colspec colwidth="1.4*" />
<thead>
<row>
<entry rowsep="1" align="center">
Texture Base Internal Format
</entry>
<entry rowsep="1" align="center">
<constant>Value</constant>
</entry>
<entry rowsep="1" align="center">
<constant>GL_REPLACE</constant> Function
</entry>
<entry rowsep="1" align="center">
<constant>GL_MODULATE</constant> Function
</entry>
<entry rowsep="1" align="center">
<constant>GL_DECAL</constant> Function
</entry>
<entry rowsep="1" align="center">
<constant>GL_BLEND</constant> Function
</entry>
<entry rowsep="1" align="center">
<constant>GL_ADD</constant> Function
</entry>
</row>
</thead>
<tbody>
<row>
<entry align="center">
<constant>GL_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = :-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
undefined
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="center">
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = :-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub s:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p A sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p A sub s:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p A sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="center">
<constant>GL_LUMINANCE</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = :-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub s:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
undefined
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p ( 1 - C sub s ) + C sub c C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mo>-</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mfenced>
<mml:mo>+</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">c</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p + C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="center">
(or 1)
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = :-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="center">
<constant>GL_LUMINANCE_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = :-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub s:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
undefined
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p ( 1 - C sub s ) + C sub c C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mo>-</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mfenced>
<mml:mo>+</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">c</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p + C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="center">
(or 2)
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = :-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub s:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p A sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p A sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p A sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="center">
<constant>GL_INTENSITY</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = :-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub s:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
undefined
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p ( 1 - C sub s ) + C sub c C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mo>-</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mfenced>
<mml:mo>+</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">c</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p + C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="center">
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = :-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub s:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p A sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p ( 1 - A sub s ) + A sub c A sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mn>1</mml:mn>
<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:mfenced>
<mml:mo>+</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">c</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p + A sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</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:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="center">
<constant>GL_RGB</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = :-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub s:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub s:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p ( 1 - C sub s ) + C sub c C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mo>-</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mfenced>
<mml:mo>+</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">c</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p + C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="center">
(or 3)
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = :-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="center">
<constant>GL_RGBA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = :-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub s:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p ( 1 - A sub s ) + C sub s A sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mn>1</mml:mn>
<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:mfenced>
<mml:mo>+</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p ( 1 - C sub s ) + C sub c C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mo>-</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mfenced>
<mml:mo>+</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">c</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: C sub v = C sub p + C sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="center">
(or 4)
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = :-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">v</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub s:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p A sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p:-->
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p A sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: A sub v = A sub p A sub s:-->
<mml:mrow>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
<mml:mo>&it;</mml:mo>
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
<para>
If <parameter>pname</parameter> is <constant>GL_TEXTURE_ENV_MODE</constant>, and <parameter>params</parameter> is <constant>GL_COMBINE</constant>, the
form of the texture function depends on the values of <constant>GL_COMBINE_RGB</constant>
and <constant>GL_COMBINE_ALPHA</constant>.
</para>
<para>
The following describes how the texture sources, as specified by
<constant>GL_SRC0_RGB</constant>, <constant>GL_SRC1_RGB</constant>, <constant>GL_SRC2_RGB</constant>,
<constant>GL_SRC0_ALPHA</constant>, <constant>GL_SRC1_ALPHA</constant>, and <constant>GL_SRC2_ALPHA</constant>,
are combined to produce a final texture color. In the following tables,
<constant>GL_SRC0_c</constant> is represented by
<inlineequation><mml:math><mml:mi mathvariant="italic">Arg0</mml:mi></mml:math></inlineequation>,
<constant>GL_SRC1_c</constant> is
represented by
<inlineequation><mml:math><mml:mi mathvariant="italic">Arg1</mml:mi></mml:math></inlineequation>,
and <constant>GL_SRC2_c</constant> is represented by
<inlineequation><mml:math><mml:mi mathvariant="italic">Arg2</mml:mi></mml:math></inlineequation>.
</para>
<para>
<constant>GL_COMBINE_RGB</constant> accepts any of <constant>GL_REPLACE</constant>, <constant>GL_MODULATE</constant>,
<constant>GL_ADD</constant>, <constant>GL_ADD_SIGNED</constant>, <constant>GL_INTERPOLATE</constant>, <constant>GL_SUBTRACT</constant>,
<constant>GL_DOT3_RGB</constant>, or <constant>GL_DOT3_RGBA</constant>.
</para>
<para>
</para>
<informaltable frame="topbot">
<tgroup cols="2" align="left">
<colspec/>
<colspec/>
<thead>
<row>
<entry rowsep="1" align="left"><emphasis role="bold">
<constant>GL_COMBINE_RGB</constant>
</emphasis></entry>
<entry rowsep="1" align="left"><emphasis role="bold">
Texture Function
</emphasis></entry>
</row>
</thead>
<tbody>
<row>
<entry align="left">
<constant>GL_REPLACE</constant>
</entry>
<entry align="left">
<inlineequation><mml:math><mml:mi mathvariant="italic">Arg0</mml:mi></mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_MODULATE</constant>
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: Arg0 * Arg1:-->
<mml:mrow>
<mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mo>&times;</mml:mo>
<mml:mi mathvariant="italic">Arg1</mml:mi>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_ADD</constant>
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: Arg0 + Arg1:-->
<mml:mrow>
<mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mo>+</mml:mo>
<mml:mi mathvariant="italic">Arg1</mml:mi>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_ADD_SIGNED</constant>
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: Arg0 + Arg1 - 0.5:-->
<mml:mrow>
<mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mo>+</mml:mo>
<mml:mi mathvariant="italic">Arg1</mml:mi>
<mml:mo>-</mml:mo>
<mml:mn>0.5</mml:mn>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_INTERPOLATE</constant>
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: Arg0 * Arg2 + Arg1*(1 - Arg2):-->
<mml:mrow>
<mml:mrow>
<mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mo>&times;</mml:mo>
<mml:mi mathvariant="italic">Arg2</mml:mi>
</mml:mrow>
<mml:mo>+</mml:mo>
<mml:mrow>
<mml:mi mathvariant="italic">Arg1</mml:mi>
<mml:mo>&times;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mo>-</mml:mo>
<mml:mi mathvariant="italic">Arg2</mml:mi>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_SUBTRACT</constant>
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: Arg0 - Arg1:-->
<mml:mrow>
<mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mo>-</mml:mo>
<mml:mi mathvariant="italic">Arg1</mml:mi>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_DOT3_RGB</constant>
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: 4 * (({Arg0 sub r} - 0.5) * ({Arg1 sub r} - 0.5)):-->
<mml:mrow>
<mml:mn>4</mml:mn>
<mml:mo>&times;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mi mathvariant="italic">r</mml:mi>
</mml:msub>
</mml:mfenced>
<mml:mo>-</mml:mo>
<mml:mn>0.5</mml:mn>
</mml:mrow>
</mml:mfenced>
<mml:mo>&times;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">Arg1</mml:mi>
<mml:mi mathvariant="italic">r</mml:mi>
</mml:msub>
</mml:mfenced>
<mml:mo>-</mml:mo>
<mml:mn>0.5</mml:mn>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
+
</entry>
</row>
<row>
<entry align="left">
or
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: (({Arg0 sub g} - 0.5) * ({Arg1 sub g} - 0.5)):-->
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mi mathvariant="italic">g</mml:mi>
</mml:msub>
</mml:mfenced>
<mml:mo>-</mml:mo>
<mml:mn>0.5</mml:mn>
</mml:mrow>
</mml:mfenced>
<mml:mo>&times;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">Arg1</mml:mi>
<mml:mi mathvariant="italic">g</mml:mi>
</mml:msub>
</mml:mfenced>
<mml:mo>-</mml:mo>
<mml:mn>0.5</mml:mn>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
</mml:mfenced>
</mml:math></inlineequation>
+
</entry>
</row>
<row>
<entry align="left">
<constant>GL_DOT3_RGBA</constant>
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: (({Arg0 sub b} - 0.5) * ({Arg1 sub b} - 0.5)):-->
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mi mathvariant="italic">b</mml:mi>
</mml:msub>
</mml:mfenced>
<mml:mo>-</mml:mo>
<mml:mn>0.5</mml:mn>
</mml:mrow>
</mml:mfenced>
<mml:mo>&times;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">Arg1</mml:mi>
<mml:mi mathvariant="italic">b</mml:mi>
</mml:msub>
</mml:mfenced>
<mml:mo>-</mml:mo>
<mml:mn>0.5</mml:mn>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
<para>
The scalar results for <constant>GL_DOT3_RGB</constant> and <constant>GL_DOT3_RGBA</constant> are placed
into each of the 3 (RGB) or 4 (RGBA) components on output.
</para>
<para>
Likewise, <constant>GL_COMBINE_ALPHA</constant> accepts any of <constant>GL_REPLACE</constant>,
<constant>GL_MODULATE</constant>, <constant>GL_ADD</constant>, <constant>GL_ADD_SIGNED</constant>, <constant>GL_INTERPOLATE</constant>, or
<constant>GL_SUBTRACT</constant>. The following table describes how alpha values are
combined:
</para>
<para>
</para>
<informaltable frame="topbot">
<tgroup cols="2" align="left">
<colspec/>
<colspec/>
<thead>
<row>
<entry rowsep="1" align="left"><emphasis role="bold">
<constant>GL_COMBINE_ALPHA</constant>
</emphasis></entry>
<entry rowsep="1" align="left"><emphasis role="bold">
Texture Function
</emphasis></entry>
</row>
</thead>
<tbody>
<row>
<entry align="left">
<constant>GL_REPLACE</constant>
</entry>
<entry align="left">
<inlineequation><mml:math><mml:mi mathvariant="italic">Arg0</mml:mi></mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_MODULATE</constant>
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: Arg0 * Arg1:-->
<mml:mrow>
<mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mo>&times;</mml:mo>
<mml:mi mathvariant="italic">Arg1</mml:mi>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_ADD</constant>
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: Arg0 + Arg1:-->
<mml:mrow>
<mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mo>+</mml:mo>
<mml:mi mathvariant="italic">Arg1</mml:mi>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_ADD_SIGNED</constant>
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: Arg0 + Arg1 - 0.5:-->
<mml:mrow>
<mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mo>+</mml:mo>
<mml:mi mathvariant="italic">Arg1</mml:mi>
<mml:mo>-</mml:mo>
<mml:mn>0.5</mml:mn>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_INTERPOLATE</constant>
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: Arg0 * Arg2 + Arg1*(1 - Arg2):-->
<mml:mrow>
<mml:mrow>
<mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mo>&times;</mml:mo>
<mml:mi mathvariant="italic">Arg2</mml:mi>
</mml:mrow>
<mml:mo>+</mml:mo>
<mml:mrow>
<mml:mi mathvariant="italic">Arg1</mml:mi>
<mml:mo>&times;</mml:mo>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mo>-</mml:mo>
<mml:mi mathvariant="italic">Arg2</mml:mi>
</mml:mrow>
</mml:mfenced>
</mml:mrow>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_SUBTRACT</constant>
</entry>
<entry align="left">
<inlineequation><mml:math>
<!-- eqn: Arg0 - Arg1:-->
<mml:mrow>
<mml:mi mathvariant="italic">Arg0</mml:mi>
<mml:mo>-</mml:mo>
<mml:mi mathvariant="italic">Arg1</mml:mi>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
<para>
In the following tables, the value
<inlineequation><mml:math>
<!-- eqn: C sub s:-->
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:math></inlineequation>
represents the color sampled
from the currently bound texture,
<inlineequation><mml:math>
<!-- eqn: C sub c:-->
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">c</mml:mi>
</mml:msub>
</mml:math></inlineequation>
represents the constant
texture-environment color,
<inlineequation><mml:math>
<!-- eqn: C sub f:-->
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">f</mml:mi>
</mml:msub>
</mml:math></inlineequation>
represents the primary color of the
incoming fragment, and
<inlineequation><mml:math>
<!-- eqn: C sub p:-->
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:math></inlineequation>
represents the color computed from the
previous texture stage or
<inlineequation><mml:math>
<!-- eqn: C sub f:-->
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">f</mml:mi>
</mml:msub>
</mml:math></inlineequation>
if processing texture stage 0. Likewise,
<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>,
<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>,
<inlineequation><mml:math>
<!-- eqn: A sub f:-->
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">f</mml:mi>
</mml:msub>
</mml:math></inlineequation>,
and
<inlineequation><mml:math>
<!-- eqn: A sub p:-->
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:math></inlineequation>
represent the respective
alpha values.
</para>
<para>
The following table describes the values assigned to
<inlineequation><mml:math><mml:mi mathvariant="italic">Arg0</mml:mi></mml:math></inlineequation>,
<inlineequation><mml:math><mml:mi mathvariant="italic">Arg1</mml:mi></mml:math></inlineequation>,
and
<inlineequation><mml:math><mml:mi mathvariant="italic">Arg2</mml:mi></mml:math></inlineequation>
based upon the RGB sources and operands:
</para>
<para>
</para>
<informaltable frame="topbot">
<tgroup cols="3" align="left">
<colspec/>
<colspec/>
<colspec align="center"/>
<thead>
<row>
<entry rowsep="1" align="left"><emphasis role="bold">
<constant>GL_SRCn_RGB</constant>
</emphasis></entry>
<entry rowsep="1" align="left"><emphasis role="bold">
<constant>GL_OPERANDn_RGB</constant>
</emphasis></entry>
<entry rowsep="1" align="center"><emphasis role="bold">
Argument Value
</emphasis></entry>
</row>
</thead>
<tbody>
<row>
<entry align="left">
<constant>GL_TEXTURE</constant>
</entry>
<entry align="left">
<constant>GL_SRC_COLOR</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {C sub s}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_COLOR</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {C sub s}:-->
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mo>-</mml:mo>
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {A sub s}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {A sub s}:-->
<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">s</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_TEXTUREn</constant>
</entry>
<entry align="left">
<constant>GL_SRC_COLOR</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {C sub s}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_COLOR</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {C sub s}:-->
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mo>-</mml:mo>
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {A sub s}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {A sub s}:-->
<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">s</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_CONSTANT</constant>
</entry>
<entry align="left">
<constant>GL_SRC_COLOR</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {C sub c}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">c</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_COLOR</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {C sub c}:-->
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mo>-</mml:mo>
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">c</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {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:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {A sub c}:-->
<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">c</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_PRIMARY_COLOR</constant>
</entry>
<entry align="left">
<constant>GL_SRC_COLOR</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {C sub f}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">f</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_COLOR</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {C sub f}:-->
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mo>-</mml:mo>
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">f</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {A sub f}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">f</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {A sub f}:-->
<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">f</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_PREVIOUS</constant>
</entry>
<entry align="left">
<constant>GL_SRC_COLOR</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {C sub p}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_COLOR</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {C sub p}:-->
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mo>-</mml:mo>
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {A sub p}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {A sub p}:-->
<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">p</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
<para>
For <constant>GL_TEXTUREn</constant> sources,
<inlineequation><mml:math>
<!-- eqn: C sub s:-->
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:math></inlineequation>
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>
represent the color
and alpha, respectively, produced from texture stage
<inlineequation><mml:math><mml:mi mathvariant="italic">n</mml:mi></mml:math></inlineequation>.
</para>
<para>
The follow table describes the values assigned to
<inlineequation><mml:math><mml:mi mathvariant="italic">Arg0</mml:mi></mml:math></inlineequation>,
<inlineequation><mml:math><mml:mi mathvariant="italic">Arg1</mml:mi></mml:math></inlineequation>,
and
<inlineequation><mml:math><mml:mi mathvariant="italic">Arg2</mml:mi></mml:math></inlineequation>
based upon the alpha sources and operands:
</para>
<para>
</para>
<informaltable frame="topbot">
<tgroup cols="3" align="left">
<colspec/>
<colspec/>
<colspec align="center"/>
<thead>
<row>
<entry rowsep="1" align="left"><emphasis role="bold">
<constant>GL_SRCn_ALPHA</constant>
</emphasis></entry>
<entry rowsep="1" align="left"><emphasis role="bold">
<constant>GL_OPERANDn_ALPHA</constant>
</emphasis></entry>
<entry rowsep="1" align="center"><emphasis role="bold">
Argument Value
</emphasis></entry>
</row>
</thead>
<tbody>
<row>
<entry align="left">
<constant>GL_TEXTURE</constant>
</entry>
<entry align="left">
<constant>GL_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {A sub s}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {A sub s}:-->
<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">s</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_TEXTUREn</constant>
</entry>
<entry align="left">
<constant>GL_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {A sub s}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">s</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {A sub s}:-->
<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">s</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_CONSTANT</constant>
</entry>
<entry align="left">
<constant>GL_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {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:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {A sub c}:-->
<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">c</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_PRIMARY_COLOR</constant>
</entry>
<entry align="left">
<constant>GL_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {A sub f}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">f</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {A sub f}:-->
<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">f</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
<constant>GL_PREVIOUS</constant>
</entry>
<entry align="left">
<constant>GL_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: {A sub p}:-->
<mml:mfenced open="" close="">
<mml:msub><mml:mi mathvariant="italic">A</mml:mi>
<mml:mi mathvariant="italic">p</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:math></inlineequation>
</entry>
</row>
<row>
<entry align="left">
</entry>
<entry align="left">
<constant>GL_ONE_MINUS_SRC_ALPHA</constant>
</entry>
<entry align="center">
<inlineequation><mml:math>
<!-- eqn: 1 - {A sub p}:-->
<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">p</mml:mi>
</mml:msub>
</mml:mfenced>
</mml:mrow>
</mml:math></inlineequation>
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
<para>
The RGB and alpha results of the texture function are multipled by the
values of <constant>GL_RGB_SCALE</constant> and <constant>GL_ALPHA_SCALE</constant>, respectively, and
clamped to the range
<inlineequation><mml:math>
<!-- eqn: [0, 1]:-->
<mml:mfenced open="[" close="]">
<mml:mn>0</mml:mn>
<mml:mn>1</mml:mn>
</mml:mfenced>
</mml:math></inlineequation>.
</para>
<para>
If <parameter>pname</parameter> is <constant>GL_TEXTURE_ENV_COLOR</constant>,
<parameter>params</parameter> is a pointer to an array that holds an RGBA color consisting of four
values.
Integer color components are interpreted linearly such that the most
positive integer maps to 1.0,
and the most negative integer maps to -1.0.
The values are clamped to the range [0,1] when they are specified.
<inlineequation><mml:math>
<!-- eqn: C sub c:-->
<mml:msub><mml:mi mathvariant="italic">C</mml:mi>
<mml:mi mathvariant="italic">c</mml:mi>
</mml:msub>
</mml:math></inlineequation>
takes these four values.
</para>
<para>
If <parameter>pname</parameter> is <constant>GL_TEXTURE_LOD_BIAS</constant>, the value specified is added to the
texture level-of-detail parameter, that selects which mipmap, or mipmaps
depending upon the selected <constant>GL_TEXTURE_MIN_FILTER</constant>, will be sampled.
</para>
<para>
<constant>GL_TEXTURE_ENV_MODE</constant> defaults to <constant>GL_MODULATE</constant> and
<constant>GL_TEXTURE_ENV_COLOR</constant> defaults to (0, 0, 0, 0).
</para>
<para>
If <parameter>target</parameter> is <constant>GL_POINT_SPRITE</constant> and <parameter>pname</parameter> is <constant>GL_COORD_REPLACE</constant>, the boolean value specified
is used to either enable or disable point sprite texture coordinate replacement. The default value is <constant>GL_FALSE</constant>.
</para>
</refsect1>
<refsect1 id="notes"><title>Notes</title>
<para>
<constant>GL_REPLACE</constant> may only be used if the GL version is 1.1 or greater.
</para>
<para>
<constant>GL_TEXTURE_FILTER_CONTROL</constant> and <constant>GL_TEXTURE_LOD_BIAS</constant> may only be
used if the GL version is 1.4 or greater.
</para>
<para>
<constant>GL_COMBINE</constant> mode and its associated constants may only be used if the
GL version is 1.3 or greater.
</para>
<para>
<constant>GL_TEXTUREn</constant> may only be used if the GL version is 1.4 or greater.
</para>
<para>
Internal formats other than 1, 2, 3, or 4 may only be used if the GL
version is 1.1 or greater.
</para>
<para>
For OpenGL versions 1.3 and greater, or when the <code>ARB_multitexture</code> extension is supported, <function>glTexEnv</function> controls
the texture environment for the current active texture unit, selected by
<citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>.
</para>
<para>
<constant>GL_POINT_SPRITE</constant> and <constant>GL_COORD_REPLACE</constant> are available
only if the GL version is 2.0 or greater.
</para>
</refsect1>
<refsect1 id="errors"><title>Errors</title>
<para>
<constant>GL_INVALID_ENUM</constant> is generated when <parameter>target</parameter> or <parameter>pname</parameter> is not
one of the accepted defined values,
or when <parameter>params</parameter> should have a defined constant value
(based on the value of <parameter>pname</parameter>)
and does not.
</para>
<para>
<constant>GL_INVALID_VALUE</constant> is generated if the <parameter>params</parameter> value for
<constant>GL_RGB_SCALE</constant> or <constant>GL_ALPHA_SCALE</constant> are not one of 1.0, 2.0,
or 4.0.
</para>
<para>
<constant>GL_INVALID_OPERATION</constant> is generated if <function>glTexEnv</function>
is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
</para>
</refsect1>
<refsect1 id="associatedgets"><title>Associated Gets</title>
<para>
<citerefentry><refentrytitle>glGetTexEnv</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glCopyPixels</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glCopyTexImage1D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glCopyTexImage2D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glCopyTexSubImage1D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glCopyTexSubImage2D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glCopyTexSubImage3D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexSubImage1D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexSubImage2D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexSubImage3D</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"></trademark> 1991-2006
Silicon Graphics, Inc. This document is licensed under the SGI
Free Software B License. For details, see
<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
</para>
</refsect1>
</refentry>
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