mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-29 01:25:44 +00:00
365 lines
18 KiB
XML
365 lines
18 KiB
XML
|
<?xml version="1.0" encoding="UTF-8"?>
|
||
|
|
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
|
||
|
|
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
|
||
|
|
<refentry id="glGetTexEnv">
|
||
|
|
<refmeta>
|
||
|
|
<refmetainfo>
|
||
|
|
<copyright>
|
||
|
|
<year>1991-2006</year>
|
||
|
|
<holder>Silicon Graphics, Inc.</holder>
|
||
|
|
</copyright>
|
||
|
|
</refmetainfo>
|
||
|
|
<refentrytitle>glGetTexEnv</refentrytitle>
|
||
|
|
<manvolnum>3G</manvolnum>
|
||
|
|
</refmeta>
|
||
|
|
<refnamediv>
|
||
|
|
<refname>glGetTexEnv</refname>
|
||
|
|
<refpurpose>return texture environment parameters</refpurpose>
|
||
|
|
</refnamediv>
|
||
|
|
<refsynopsisdiv><title>C Specification</title>
|
||
|
|
<funcsynopsis>
|
||
|
|
<funcprototype>
|
||
|
|
<funcdef>void <function>glGetTexEnvfv</function></funcdef>
|
||
|
|
<paramdef>GLenum <parameter>target</parameter></paramdef>
|
||
|
|
<paramdef>GLenum <parameter>pname</parameter></paramdef>
|
||
|
|
<paramdef>GLfloat * <parameter>params</parameter></paramdef>
|
||
|
|
</funcprototype>
|
||
|
|
</funcsynopsis>
|
||
|
|
<para></para>
|
||
|
|
<funcsynopsis>
|
||
|
|
<funcprototype>
|
||
|
|
<funcdef>void <function>glGetTexEnviv</function></funcdef>
|
||
|
|
<paramdef>GLenum <parameter>target</parameter></paramdef>
|
||
|
|
<paramdef>GLenum <parameter>pname</parameter></paramdef>
|
||
|
|
<paramdef>GLint * <parameter>params</parameter></paramdef>
|
||
|
|
</funcprototype>
|
||
|
|
</funcsynopsis>
|
||
|
|
</refsynopsisdiv>
|
||
|
|
<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 texture environment parameter.
|
||
|
|
Accepted values are <constant>GL_TEXTURE_ENV_MODE</constant>, <constant>GL_TEXTURE_ENV_COLOR</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>params</parameter></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
Returns the requested data.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
</variablelist>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="description"><title>Description</title>
|
||
|
|
<para>
|
||
|
|
<function>glGetTexEnv</function> returns in <parameter>params</parameter> selected values of a texture environment that
|
||
|
|
was specified with <citerefentry><refentrytitle>glTexEnv</refentrytitle></citerefentry>.
|
||
|
|
<parameter>target</parameter> specifies a texture environment.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
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_POINT_SPRITE</constant>,
|
||
|
|
<parameter>pname</parameter> must be <constant>GL_COORD_REPLACE</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>
|
||
|
|
<parameter>pname</parameter> names a specific texture environment parameter, as follows:
|
||
|
|
</para>
|
||
|
|
<variablelist>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_TEXTURE_ENV_MODE</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns the single-valued texture environment mode,
|
||
|
|
a symbolic constant. The initial value is <constant>GL_MODULATE</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_TEXTURE_ENV_COLOR</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns four integer or floating-point values that are the
|
||
|
|
texture environment color.
|
||
|
|
Integer values,
|
||
|
|
when requested,
|
||
|
|
are linearly mapped from the internal floating-point representation
|
||
|
|
such that 1.0 maps to the most positive representable integer,
|
||
|
|
and
|
||
|
|
<inlineequation><mml:math>
|
||
|
|
<!-- eqn: -1.0:-->
|
||
|
|
<mml:mn>-1.0</mml:mn>
|
||
|
|
</mml:math></inlineequation>
|
||
|
|
maps to the most negative representable integer. The initial
|
||
|
|
value is (0, 0, 0, 0).
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_TEXTURE_LOD_BIAS</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single floating-point value that is the texture
|
||
|
|
level-of-detail bias. The initial value is 0.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_COMBINE_RGB</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the current
|
||
|
|
RGB combine mode. The initial value is <constant>GL_MODULATE</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_COMBINE_ALPHA</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the current
|
||
|
|
alpha combine mode. The initial value is <constant>GL_MODULATE</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_SRC0_RGB</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the texture
|
||
|
|
combiner zero's RGB source. The initial value is <constant>GL_TEXTURE</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_SRC1_RGB</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the texture
|
||
|
|
combiner one's RGB source. The initial value is <constant>GL_PREVIOUS</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_SRC2_RGB</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the texture
|
||
|
|
combiner two's RGB source. The initial value is <constant>GL_CONSTANT</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_SRC0_ALPHA</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the texture
|
||
|
|
combiner zero's alpha source. The initial value is <constant>GL_TEXTURE</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_SRC1_ALPHA</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the texture
|
||
|
|
combiner one's alpha source. The initial value is <constant>GL_PREVIOUS</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_SRC2_ALPHA</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the texture
|
||
|
|
combiner two's alpha source. The initial value is <constant>GL_CONSTANT</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_OPERAND0_RGB</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the texture
|
||
|
|
combiner zero's RGB operand. The initial value is <constant>GL_SRC_COLOR</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_OPERAND1_RGB</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the texture
|
||
|
|
combiner one's RGB operand. The initial value is <constant>GL_SRC_COLOR</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_OPERAND2_RGB</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the texture
|
||
|
|
combiner two's RGB operand. The initial value is <constant>GL_SRC_ALPHA</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_OPERAND0_ALPHA</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the texture
|
||
|
|
combiner zero's alpha operand. The initial value is <constant>GL_SRC_ALPHA</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_OPERAND1_ALPHA</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the texture
|
||
|
|
combiner one's alpha operand. The initial value is <constant>GL_SRC_ALPHA</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_OPERAND2_ALPHA</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single symbolic constant value representing the texture
|
||
|
|
combiner two's alpha operand. The initial value is <constant>GL_SRC_ALPHA</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_RGB_SCALE</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single floating-point value representing the current RGB
|
||
|
|
texture combiner scaling factor. The initial value is 1.0.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_ALPHA_SCALE</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single floating-point value representing the current alpha
|
||
|
|
texture combiner scaling factor. The initial value is 1.0.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><constant>GL_COORD_REPLACE</constant></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
<parameter>params</parameter> returns a single boolean value representing the current point sprite
|
||
|
|
texture coordinate replacement enable state. The initial value is <constant>GL_FALSE</constant>.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
</variablelist>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="notes"><title>Notes</title>
|
||
|
|
<para>
|
||
|
|
If an error is generated,
|
||
|
|
no change is made to the contents of <parameter>params</parameter>.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
For OpenGL versions 1.3 and greater, or when the <code>ARB_multitexture</code> extension is supported, <function>glGetTexEnv</function> returns
|
||
|
|
the texture environment parameters for the active texture unit.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<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>, and
|
||
|
|
<constant>GL_ALPHA_SCALE</constant> are available only if the GL version is 1.3 or greater.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<constant>GL_TEXTURE_FILTER_CONTROL</constant> and <constant>GL_TEXTURE_LOD_BIAS</constant> are available
|
||
|
|
only if the GL version is 1.4 or greater.
|
||
|
|
</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 if <parameter>target</parameter> or <parameter>pname</parameter> is not an
|
||
|
|
accepted value.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <function>glGetTexEnv</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="seealso"><title>See Also</title>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glTexEnv</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>
|