mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-25 14:05:33 +00:00
233 lines
12 KiB
XML
233 lines
12 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="glViewportArray">
|
|
<refentryinfo>
|
|
<copyright>
|
|
<year>2010-2013</year>
|
|
<holder>Khronos Group</holder>
|
|
</copyright>
|
|
</refentryinfo>
|
|
<refmeta>
|
|
<refentrytitle>glViewportArray</refentrytitle>
|
|
<manvolnum>3G</manvolnum>
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname>glViewportArray</refname>
|
|
<refpurpose>set multiple viewports</refpurpose>
|
|
</refnamediv>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void <function>glViewportArrayv</function></funcdef>
|
|
<paramdef>GLuint <parameter>first</parameter></paramdef>
|
|
<paramdef>GLsizei <parameter>count</parameter></paramdef>
|
|
<paramdef>const GLfloat *<parameter>v</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<refsect1 id="parameters"><title>Parameters</title>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>first</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specify the first viewport to set.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>count</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specify the number of viewports to set.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>v</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specify the address of an array containing the viewport parameters.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="description"><title>Description</title>
|
|
<para>
|
|
<function>glViewportArrayv</function> specifies the parameters for multiple viewports
|
|
simulataneously. <parameter>first</parameter> specifies the index of the first viewport
|
|
to modify and <parameter>count</parameter> specifies the number of viewports to modify.
|
|
<parameter>first</parameter> must be less than the value of <constant>GL_MAX_VIEWPORTS</constant>,
|
|
and <parameter>first</parameter> + <parameter>count</parameter> must be less than or equal to
|
|
the value of <constant>GL_MAX_VIEWPORTS</constant>. Viewports whose indices lie outside
|
|
the range [<parameter>first</parameter>, <parameter>first</parameter> + <parameter>count</parameter>)
|
|
are not modified. <parameter>v</parameter> contains the address of an array of floating
|
|
point values specifying the
|
|
left (<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>),
|
|
bottom (<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>),
|
|
width (<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>),
|
|
and height (<inlineequation><mml:math><mml:mi mathvariant="italic">h</mml:mi></mml:math></inlineequation>)
|
|
of each viewport, in that order. <inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
|
|
and <inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation> give
|
|
the location of the viewport's lower left corner, and
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>
|
|
and <inlineequation><mml:math><mml:mi mathvariant="italic">h</mml:mi></mml:math></inlineequation>
|
|
give the width and height of the viewport, respectively.
|
|
The viewport specifies the affine transformation of
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
|
|
and
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>
|
|
from
|
|
normalized device coordinates to window coordinates.
|
|
Let
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (x sub nd, y sub nd): -->
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:msub><mml:mi mathvariant="italic">x</mml:mi>
|
|
<mml:mi mathvariant="italic">nd</mml:mi>
|
|
</mml:msub>
|
|
<mml:msub><mml:mi mathvariant="italic">y</mml:mi>
|
|
<mml:mi mathvariant="italic">nd</mml:mi>
|
|
</mml:msub>
|
|
</mml:mfenced>
|
|
</mml:math></inlineequation>
|
|
be normalized device coordinates.
|
|
Then the window coordinates
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: (x sub w, y sub w): -->
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:msub><mml:mi mathvariant="italic">x</mml:mi>
|
|
<mml:mi mathvariant="italic">w</mml:mi>
|
|
</mml:msub>
|
|
<mml:msub><mml:mi mathvariant="italic">y</mml:mi>
|
|
<mml:mi mathvariant="italic">w</mml:mi>
|
|
</mml:msub>
|
|
</mml:mfenced>
|
|
</mml:math></inlineequation>
|
|
are computed as follows:
|
|
</para>
|
|
<para>
|
|
<informalequation><mml:math>
|
|
<!-- eqn: x sub w = ( x sub nd + 1 ) left ( width over 2 right ) + x: -->
|
|
<mml:mrow>
|
|
<mml:msub><mml:mi mathvariant="italic">x</mml:mi>
|
|
<mml:mi mathvariant="italic">w</mml:mi>
|
|
</mml:msub>
|
|
<mml:mo>=</mml:mo>
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msub><mml:mi mathvariant="italic">x</mml:mi>
|
|
<mml:mi mathvariant="italic">nd</mml:mi>
|
|
</mml:msub>
|
|
<mml:mo>+</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mfrac>
|
|
<mml:mi mathvariant="italic">width</mml:mi>
|
|
<mml:mn>2</mml:mn>
|
|
</mml:mfrac>
|
|
</mml:mfenced>
|
|
<mml:mo>+</mml:mo>
|
|
<mml:mi mathvariant="italic">x</mml:mi>
|
|
</mml:mrow>
|
|
</mml:mrow>
|
|
</mml:math></informalequation>
|
|
</para>
|
|
<para>
|
|
<informalequation><mml:math>
|
|
<!-- eqn: y sub w = ( y sub nd + 1 ) left ( height over 2 right ) + y: -->
|
|
<mml:mrow>
|
|
<mml:msub><mml:mi mathvariant="italic">y</mml:mi>
|
|
<mml:mi mathvariant="italic">w</mml:mi>
|
|
</mml:msub>
|
|
<mml:mo>=</mml:mo>
|
|
<mml:mrow>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mrow>
|
|
<mml:msub><mml:mi mathvariant="italic">y</mml:mi>
|
|
<mml:mi mathvariant="italic">nd</mml:mi>
|
|
</mml:msub>
|
|
<mml:mo>+</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:mfenced>
|
|
<mml:mo>⁢</mml:mo>
|
|
<mml:mfenced open="(" close=")">
|
|
<mml:mfrac>
|
|
<mml:mi mathvariant="italic">height</mml:mi>
|
|
<mml:mn>2</mml:mn>
|
|
</mml:mfrac>
|
|
</mml:mfenced>
|
|
<mml:mo>+</mml:mo>
|
|
<mml:mi mathvariant="italic">y</mml:mi>
|
|
</mml:mrow>
|
|
</mml:mrow>
|
|
</mml:math></informalequation>
|
|
</para>
|
|
<para>
|
|
The location of the viewport's bottom left corner, given by
|
|
(<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>, <inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>)
|
|
is clamped to be within the implementaiton-dependent viewport bounds range.
|
|
The viewport bounds range [<inlineequation><mml:math><mml:mi mathvariant="italic">min</mml:mi></mml:math></inlineequation>, <inlineequation><mml:math><mml:mi mathvariant="italic">max</mml:mi></mml:math></inlineequation>]
|
|
can be determined by calling <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument
|
|
<constant>GL_VIEWPORT_BOUNDS_RANGE</constant>.
|
|
Viewport width and height are silently clamped
|
|
to a range that depends on the implementation.
|
|
To query this range, call <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument
|
|
<constant>GL_MAX_VIEWPORT_DIMS</constant>.
|
|
</para>
|
|
<para>
|
|
The precision with which the GL interprets the floating point viewport bounds is implementation-dependent
|
|
and may be determined by querying the impementation-defined constant <constant>GL_VIEWPORT_SUBPIXEL_BITS</constant>.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>first</parameter> is greater than or equal to
|
|
the value of <constant>GL_MAX_VIEWPORTS</constant>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>first</parameter> + <parameter>count</parameter>
|
|
is greater than or equal to the value of <constant>GL_MAX_VIEWPORTS</constant>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> is generated if either <parameter>width</parameter> or <parameter>height</parameter> is negative.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="associatedgets"><title>Associated Gets</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_VIEWPORT</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAX_VIEWPORT_DIMS</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_VIEWPORT_BOUNDS_RANGE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_VIEWPORT_SUBPIXEL_BITS</constant>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glDepthRange</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glViewport</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glViewportIndexed</refentrytitle></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="Copyright"><title>Copyright</title>
|
|
<para>
|
|
Copyright <trademark class="copyright"></trademark> 2010-2013 Khronos Group.
|
|
This material may be distributed subject to the terms and conditions set forth in
|
|
the Open Publication License, v 1.0, 8 June 1999.
|
|
<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|