mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-26 19:45:32 +00:00
363 lines
18 KiB
XML
363 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="glEvalCoord">
|
||
|
|
<refmeta>
|
||
|
|
<refmetainfo>
|
||
|
|
<copyright>
|
||
|
|
<year>1991-2006</year>
|
||
|
|
<holder>Silicon Graphics, Inc.</holder>
|
||
|
|
</copyright>
|
||
|
|
</refmetainfo>
|
||
|
|
<refentrytitle>glEvalCoord</refentrytitle>
|
||
|
|
<manvolnum>3G</manvolnum>
|
||
|
|
</refmeta>
|
||
|
|
<refnamediv>
|
||
|
|
<refname>glEvalCoord</refname>
|
||
|
|
<refpurpose>evaluate enabled one- and two-dimensional maps</refpurpose>
|
||
|
|
</refnamediv>
|
||
|
|
<!-- eqn: ignoring delim $$ -->
|
||
|
|
<refsynopsisdiv><title>C Specification</title>
|
||
|
|
<funcsynopsis>
|
||
|
|
<funcprototype>
|
||
|
|
<funcdef>void <function>glEvalCoord1f</function></funcdef>
|
||
|
|
<paramdef>GLfloat <parameter>u</parameter></paramdef>
|
||
|
|
</funcprototype>
|
||
|
|
</funcsynopsis>
|
||
|
|
<funcsynopsis>
|
||
|
|
<funcprototype>
|
||
|
|
<funcdef>void <function>glEvalCoord1d</function></funcdef>
|
||
|
|
<paramdef>GLdouble <parameter>u</parameter></paramdef>
|
||
|
|
</funcprototype>
|
||
|
|
</funcsynopsis>
|
||
|
|
<funcsynopsis>
|
||
|
|
<funcprototype>
|
||
|
|
<funcdef>void <function>glEvalCoord2f</function></funcdef>
|
||
|
|
<paramdef>GLfloat <parameter>u</parameter></paramdef>
|
||
|
|
<paramdef>GLfloat <parameter>v</parameter></paramdef>
|
||
|
|
</funcprototype>
|
||
|
|
</funcsynopsis>
|
||
|
|
<funcsynopsis>
|
||
|
|
<funcprototype>
|
||
|
|
<funcdef>void <function>glEvalCoord2d</function></funcdef>
|
||
|
|
<paramdef>GLdouble <parameter>u</parameter></paramdef>
|
||
|
|
<paramdef>GLdouble <parameter>v</parameter></paramdef>
|
||
|
|
</funcprototype>
|
||
|
|
</funcsynopsis>
|
||
|
|
</refsynopsisdiv>
|
||
|
|
<refsect1 id="parameters"><title>Parameters</title>
|
||
|
|
<variablelist>
|
||
|
|
<varlistentry>
|
||
|
|
<term><parameter>u</parameter></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
Specifies a value that is the domain coordinate
|
||
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">u</mml:mi></mml:math></inlineequation>
|
||
|
|
to the basis function
|
||
|
|
defined in a previous <citerefentry><refentrytitle>glMap1</refentrytitle></citerefentry> or <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry> command.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term><parameter>v</parameter></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
Specifies a value that is the domain coordinate
|
||
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">v</mml:mi></mml:math></inlineequation>
|
||
|
|
to the basis function
|
||
|
|
defined in a previous <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry> command.
|
||
|
|
This argument is not present in a <function>glEvalCoord1</function> command.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
</variablelist>
|
||
|
|
</refsect1>
|
||
|
|
<refsynopsisdiv><title>C Specification</title>
|
||
|
|
<funcsynopsis>
|
||
|
|
<funcprototype>
|
||
|
|
<funcdef>void <function>glEvalCoord1fv</function></funcdef>
|
||
|
|
<paramdef>const GLfloat * <parameter>u</parameter></paramdef>
|
||
|
|
</funcprototype>
|
||
|
|
</funcsynopsis>
|
||
|
|
<funcsynopsis>
|
||
|
|
<funcprototype>
|
||
|
|
<funcdef>void <function>glEvalCoord1dv</function></funcdef>
|
||
|
|
<paramdef>const GLdouble * <parameter>u</parameter></paramdef>
|
||
|
|
</funcprototype>
|
||
|
|
</funcsynopsis>
|
||
|
|
<funcsynopsis>
|
||
|
|
<funcprototype>
|
||
|
|
<funcdef>void <function>glEvalCoord2fv</function></funcdef>
|
||
|
|
<paramdef>const GLfloat * <parameter>u</parameter></paramdef>
|
||
|
|
</funcprototype>
|
||
|
|
</funcsynopsis>
|
||
|
|
<funcsynopsis>
|
||
|
|
<funcprototype>
|
||
|
|
<funcdef>void <function>glEvalCoord2dv</function></funcdef>
|
||
|
|
<paramdef>const GLdouble * <parameter>u</parameter></paramdef>
|
||
|
|
</funcprototype>
|
||
|
|
</funcsynopsis>
|
||
|
|
</refsynopsisdiv>
|
||
|
|
<refsect1 id="parameters2"><title>Parameters</title>
|
||
|
|
<variablelist>
|
||
|
|
<varlistentry>
|
||
|
|
<term><parameter>u</parameter></term>
|
||
|
|
<listitem>
|
||
|
|
<para>
|
||
|
|
Specifies a pointer to an array containing
|
||
|
|
either one or two domain coordinates.
|
||
|
|
The first coordinate is
|
||
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">u</mml:mi></mml:math></inlineequation>.
|
||
|
|
The second coordinate is
|
||
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">v</mml:mi></mml:math></inlineequation>,
|
||
|
|
which is present only in <function>glEvalCoord2</function> versions.
|
||
|
|
</para>
|
||
|
|
</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
</variablelist>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="description"><title>Description</title>
|
||
|
|
<para>
|
||
|
|
<function>glEvalCoord1</function> evaluates enabled one-dimensional maps at argument
|
||
|
|
<parameter>u</parameter>.
|
||
|
|
<function>glEvalCoord2</function> does the same for two-dimensional maps using
|
||
|
|
two domain values,
|
||
|
|
<parameter>u</parameter> and <parameter>v</parameter>.
|
||
|
|
To define a map, call <citerefentry><refentrytitle>glMap1</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>; to enable and
|
||
|
|
disable it, call <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glDisable</refentrytitle></citerefentry>.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
When one of the <function>glEvalCoord</function> commands is issued,
|
||
|
|
all currently enabled maps of the indicated dimension are evaluated.
|
||
|
|
Then,
|
||
|
|
for each enabled map,
|
||
|
|
it is as if the corresponding GL command had been issued with the
|
||
|
|
computed value.
|
||
|
|
That is,
|
||
|
|
if <constant>GL_MAP1_INDEX</constant> or
|
||
|
|
<constant>GL_MAP2_INDEX</constant> is enabled,
|
||
|
|
a <citerefentry><refentrytitle>glIndex</refentrytitle></citerefentry> command is simulated.
|
||
|
|
If <constant>GL_MAP1_COLOR_4</constant> or
|
||
|
|
<constant>GL_MAP2_COLOR_4</constant> is enabled,
|
||
|
|
a <citerefentry><refentrytitle>glColor</refentrytitle></citerefentry> command is simulated.
|
||
|
|
If <constant>GL_MAP1_NORMAL</constant> or <constant>GL_MAP2_NORMAL</constant> is enabled,
|
||
|
|
a normal vector is produced,
|
||
|
|
and if any of
|
||
|
|
<constant>GL_MAP1_TEXTURE_COORD_1</constant>,
|
||
|
|
<constant>GL_MAP1_TEXTURE_COORD_2</constant>,
|
||
|
|
<constant>GL_MAP1_TEXTURE_COORD_3</constant>,
|
||
|
|
<constant>GL_MAP1_TEXTURE_COORD_4</constant>,
|
||
|
|
<constant>GL_MAP2_TEXTURE_COORD_1</constant>,
|
||
|
|
<constant>GL_MAP2_TEXTURE_COORD_2</constant>,
|
||
|
|
<constant>GL_MAP2_TEXTURE_COORD_3</constant>, or
|
||
|
|
<constant>GL_MAP2_TEXTURE_COORD_4</constant> is enabled, then an appropriate <citerefentry><refentrytitle>glTexCoord</refentrytitle></citerefentry> command is simulated.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
For color,
|
||
|
|
color index,
|
||
|
|
normal,
|
||
|
|
and texture coordinates the GL uses evaluated values instead of current values for those evaluations
|
||
|
|
that are enabled,
|
||
|
|
and current values otherwise,
|
||
|
|
However,
|
||
|
|
the evaluated values do not update the current values.
|
||
|
|
Thus, if <citerefentry><refentrytitle>glVertex</refentrytitle></citerefentry> commands are interspersed with <function>glEvalCoord</function>
|
||
|
|
commands, the color,
|
||
|
|
normal,
|
||
|
|
and texture coordinates associated with the <citerefentry><refentrytitle>glVertex</refentrytitle></citerefentry> commands are not
|
||
|
|
affected by the values generated by the <function>glEvalCoord</function> commands,
|
||
|
|
but only by the most recent
|
||
|
|
<citerefentry><refentrytitle>glColor</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glIndex</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glNormal</refentrytitle></citerefentry>, and
|
||
|
|
<citerefentry><refentrytitle>glTexCoord</refentrytitle></citerefentry> commands.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
No commands are issued for maps that are not enabled.
|
||
|
|
If more than one texture evaluation is enabled for a particular dimension
|
||
|
|
(for example, <constant>GL_MAP2_TEXTURE_COORD_1</constant> and
|
||
|
|
<constant>GL_MAP2_TEXTURE_COORD_2</constant>),
|
||
|
|
then only the evaluation of the map that produces the larger
|
||
|
|
number of coordinates
|
||
|
|
(in this case, <constant>GL_MAP2_TEXTURE_COORD_2</constant>)
|
||
|
|
is carried out.
|
||
|
|
<constant>GL_MAP1_VERTEX_4</constant> overrides <constant>GL_MAP1_VERTEX_3</constant>,
|
||
|
|
and
|
||
|
|
<constant>GL_MAP2_VERTEX_4</constant> overrides <constant>GL_MAP2_VERTEX_3</constant>,
|
||
|
|
in the same manner.
|
||
|
|
If neither a three- nor a four-component vertex map is enabled for the
|
||
|
|
specified dimension,
|
||
|
|
the <function>glEvalCoord</function> command is ignored.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
If you have enabled automatic normal generation,
|
||
|
|
by calling <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry> with argument <constant>GL_AUTO_NORMAL</constant>,
|
||
|
|
<function>glEvalCoord2</function> generates surface normals analytically,
|
||
|
|
regardless of the contents or enabling of the <constant>GL_MAP2_NORMAL</constant> map.
|
||
|
|
Let
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<informalequation><mml:math>
|
||
|
|
<!-- eqn: bold m = { {partial bold p} over {partial u} } times { {partial bold p} over {partial v} }:-->
|
||
|
|
<mml:mrow>
|
||
|
|
<mml:mi mathvariant="bold">m</mml:mi>
|
||
|
|
<mml:mo>=</mml:mo>
|
||
|
|
<mml:mrow>
|
||
|
|
<mml:mfenced open="" close="">
|
||
|
|
<mml:mfrac>
|
||
|
|
<mml:mfenced open="" close="">
|
||
|
|
<mml:mrow>
|
||
|
|
<mml:mo>∂</mml:mo>
|
||
|
|
<mml:mi mathvariant="bold">p</mml:mi>
|
||
|
|
</mml:mrow>
|
||
|
|
</mml:mfenced>
|
||
|
|
<mml:mfenced open="" close="">
|
||
|
|
<mml:mrow>
|
||
|
|
<mml:mo>∂</mml:mo>
|
||
|
|
<mml:mi mathvariant="italic">u</mml:mi>
|
||
|
|
</mml:mrow>
|
||
|
|
</mml:mfenced>
|
||
|
|
</mml:mfrac>
|
||
|
|
</mml:mfenced>
|
||
|
|
<mml:mo>×</mml:mo>
|
||
|
|
<mml:mfenced open="" close="">
|
||
|
|
<mml:mfrac>
|
||
|
|
<mml:mfenced open="" close="">
|
||
|
|
<mml:mrow>
|
||
|
|
<mml:mo>∂</mml:mo>
|
||
|
|
<mml:mi mathvariant="bold">p</mml:mi>
|
||
|
|
</mml:mrow>
|
||
|
|
</mml:mfenced>
|
||
|
|
<mml:mfenced open="" close="">
|
||
|
|
<mml:mrow>
|
||
|
|
<mml:mo>∂</mml:mo>
|
||
|
|
<mml:mi mathvariant="italic">v</mml:mi>
|
||
|
|
</mml:mrow>
|
||
|
|
</mml:mfenced>
|
||
|
|
</mml:mfrac>
|
||
|
|
</mml:mfenced>
|
||
|
|
</mml:mrow>
|
||
|
|
</mml:mrow>
|
||
|
|
</mml:math></informalequation>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
Then the generated normal
|
||
|
|
<inlineequation><mml:math>
|
||
|
|
<!-- eqn: bold n:-->
|
||
|
|
<mml:mi mathvariant="bold">n</mml:mi>
|
||
|
|
</mml:math></inlineequation>
|
||
|
|
is
|
||
|
|
<inlineequation><mml:math>
|
||
|
|
<!-- eqn: bold n = bold m over { || bold m || }:-->
|
||
|
|
<mml:mrow>
|
||
|
|
<mml:mi mathvariant="bold">n</mml:mi>
|
||
|
|
<mml:mo>=</mml:mo>
|
||
|
|
<mml:mfrac>
|
||
|
|
<mml:mi mathvariant="bold">m</mml:mi>
|
||
|
|
<mml:mfenced open="" close="">
|
||
|
|
<mml:mfenced open="∥" close="∥">
|
||
|
|
<mml:mi mathvariant="bold">m</mml:mi>
|
||
|
|
</mml:mfenced>
|
||
|
|
</mml:mfenced>
|
||
|
|
</mml:mfrac>
|
||
|
|
</mml:mrow>
|
||
|
|
</mml:math></inlineequation>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
If automatic normal generation is disabled,
|
||
|
|
the corresponding normal map <constant>GL_MAP2_NORMAL</constant>,
|
||
|
|
if enabled,
|
||
|
|
is used to produce a normal.
|
||
|
|
If neither automatic normal generation nor a normal map is enabled,
|
||
|
|
no normal is generated for
|
||
|
|
<function>glEvalCoord2</function> commands.
|
||
|
|
</para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="associatedgets"><title>Associated Gets</title>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP1_VERTEX_3</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP1_VERTEX_4</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP1_INDEX</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP1_COLOR_4</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP1_NORMAL</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP1_TEXTURE_COORD_1</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP1_TEXTURE_COORD_2</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP1_TEXTURE_COORD_3</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP1_TEXTURE_COORD_4</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP2_VERTEX_3</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP2_VERTEX_4</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP2_INDEX</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP2_COLOR_4</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP2_NORMAL</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP2_TEXTURE_COORD_1</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP2_TEXTURE_COORD_2</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP2_TEXTURE_COORD_3</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_MAP2_TEXTURE_COORD_4</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_AUTO_NORMAL</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glGetMap</refentrytitle></citerefentry>
|
||
|
|
</para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="seealso"><title>See Also</title>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glColor</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glEvalMesh</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glEvalPoint</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glIndex</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glMap1</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glMapGrid</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glNormal</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glTexCoord</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glVertex</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>
|