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266 lines
14 KiB
XML
266 lines
14 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glViewportIndexed">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>2010</year>
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<holder>Khronos Group</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glViewportIndexed</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glViewportIndexed</refname>
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<refpurpose>set a specified viewport</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glViewportIndexedf</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLfloat <parameter>x</parameter></paramdef>
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<paramdef>GLfloat <parameter>y</parameter></paramdef>
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<paramdef>GLfloat <parameter>w</parameter></paramdef>
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<paramdef>GLfloat <parameter>h</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glViewportIndexedfv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLfloat *<parameter>v</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>index</parameter></term>
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<listitem>
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<para>
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Specify the first viewport to set.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>x</parameter></term>
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<term><parameter>y</parameter></term>
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<listitem>
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<para>
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For <function>glViewportIndexedf</function>, specifies the lower left corner of
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the viewport rectangle, in pixels. The initial value is (0,0).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>width</parameter></term>
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<term><parameter>height</parameter></term>
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<listitem>
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<para>
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For <function>glViewportIndexedf</function>, specifies the width and height
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of the viewport.
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When a GL context is first attached to a window,
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<parameter>width</parameter> and <parameter>height</parameter> are set to the dimensions of that
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window.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>v</parameter></term>
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<listitem>
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<para>
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For <function>glViewportIndexedfv</function>, specifies the address of an array containing the viewport parameters.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>glViewportIndexedf</function> and <function>glViewportIndexedfv</function>
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specify the parameters for a single viewport.
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<parameter>index</parameter> specifies the index of the viewport
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to modify.
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<parameter>index</parameter> must be less than the value of <constant>GL_MAX_VIEWPORTS</constant>.
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For <function>glViewportIndexedf</function>, <parameter>x</parameter>, <parameter>y</parameter>,
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<parameter>w</parameter>, and <parameter>h</parameter> specify the left, bottom, width and height
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of the viewport in pixels, respectively.
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For <function>glViewportIndexedfv</function>, <parameter>v</parameter> contains the address of an array of floating
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point values specifying the
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left (<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>),
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bottom (<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>),
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width (<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>),
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and height (<inlineequation><mml:math><mml:mi mathvariant="italic">h</mml:mi></mml:math></inlineequation>)
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of each viewport, in that order. <inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
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and <inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation> give
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the location of the viewport's lower left corner, and
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<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>
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and <inlineequation><mml:math><mml:mi mathvariant="italic">h</mml:mi></mml:math></inlineequation>
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give the width and height of the viewport, respectively.
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The viewport specifies the affine transformation of
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<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
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and
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<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>
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from
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normalized device coordinates to window coordinates.
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Let
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<inlineequation><mml:math>
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<!-- eqn: (x sub nd, y sub nd): -->
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<mml:mfenced open="(" close=")">
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<mml:msub><mml:mi mathvariant="italic">x</mml:mi>
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<mml:mi mathvariant="italic">nd</mml:mi>
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</mml:msub>
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<mml:msub><mml:mi mathvariant="italic">y</mml:mi>
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<mml:mi mathvariant="italic">nd</mml:mi>
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</mml:msub>
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</mml:mfenced>
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</mml:math></inlineequation>
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be normalized device coordinates.
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Then the window coordinates
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<inlineequation><mml:math>
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<!-- eqn: (x sub w, y sub w): -->
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<mml:mfenced open="(" close=")">
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<mml:msub><mml:mi mathvariant="italic">x</mml:mi>
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<mml:mi mathvariant="italic">w</mml:mi>
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</mml:msub>
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<mml:msub><mml:mi mathvariant="italic">y</mml:mi>
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<mml:mi mathvariant="italic">w</mml:mi>
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</mml:msub>
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</mml:mfenced>
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</mml:math></inlineequation>
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are computed as follows:
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</para>
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<para>
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<informalequation><mml:math>
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<!-- eqn: x sub w = ( x sub nd + 1 ) left ( width over 2 right ) + x: -->
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<mml:mrow>
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<mml:msub><mml:mi mathvariant="italic">x</mml:mi>
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<mml:mi mathvariant="italic">w</mml:mi>
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</mml:msub>
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<mml:mo>=</mml:mo>
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<mml:mrow>
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<mml:mfenced open="(" close=")">
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<mml:mrow>
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<mml:msub><mml:mi mathvariant="italic">x</mml:mi>
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<mml:mi mathvariant="italic">nd</mml:mi>
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</mml:msub>
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<mml:mo>+</mml:mo>
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<mml:mn>1</mml:mn>
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</mml:mrow>
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</mml:mfenced>
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<mml:mo>⁢</mml:mo>
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<mml:mfenced open="(" close=")">
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<mml:mfrac>
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<mml:mi mathvariant="italic">width</mml:mi>
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<mml:mn>2</mml:mn>
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</mml:mfrac>
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</mml:mfenced>
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<mml:mo>+</mml:mo>
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<mml:mi mathvariant="italic">x</mml:mi>
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</mml:mrow>
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</mml:mrow>
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</mml:math></informalequation>
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</para>
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<para>
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<informalequation><mml:math>
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<!-- eqn: y sub w = ( y sub nd + 1 ) left ( height over 2 right ) + y: -->
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<mml:mrow>
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<mml:msub><mml:mi mathvariant="italic">y</mml:mi>
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<mml:mi mathvariant="italic">w</mml:mi>
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</mml:msub>
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<mml:mo>=</mml:mo>
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<mml:mrow>
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<mml:mfenced open="(" close=")">
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<mml:mrow>
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<mml:msub><mml:mi mathvariant="italic">y</mml:mi>
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<mml:mi mathvariant="italic">nd</mml:mi>
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</mml:msub>
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<mml:mo>+</mml:mo>
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<mml:mn>1</mml:mn>
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</mml:mrow>
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</mml:mfenced>
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<mml:mo>⁢</mml:mo>
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<mml:mfenced open="(" close=")">
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<mml:mfrac>
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<mml:mi mathvariant="italic">height</mml:mi>
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<mml:mn>2</mml:mn>
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</mml:mfrac>
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</mml:mfenced>
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<mml:mo>+</mml:mo>
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<mml:mi mathvariant="italic">y</mml:mi>
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</mml:mrow>
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</mml:mrow>
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</mml:math></informalequation>
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</para>
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<para>
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The location of the viewport's bottom left corner, given by
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(<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>)
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is clamped to be within the implementaiton-dependent viewport bounds range.
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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>]
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can be determined by calling <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument
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<constant>GL_VIEWPORT_BOUNDS_RANGE</constant>.
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Viewport width and height are silently clamped
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to a range that depends on the implementation.
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To query this range, call <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument
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<constant>GL_MAX_VIEWPORT_DIMS</constant>.
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</para>
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<para>
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The precision with which the GL interprets the floating point viewport bounds is implementation-dependent
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and may be determined by querying the impementation-defined constant <constant>GL_VIEWPORT_SUBPIXEL_BITS</constant>.
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</para>
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<para>
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Calling <function>glViewportIndexedfv</function> is equivalent to calling <citerefentry><refentrytitle>glViewportArray</refentrytitle></citerefentry>
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with <parameter>first</parameter> set to <parameter>index</parameter>, <parameter>count</parameter> set to
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1 and <parameter>v</parameter> passsed directly. <function>glViewportIndexedf</function> is equivalent
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to:
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</para>
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<programlisting><![CDATA[ void glViewportIndexedf(GLuint index, GLfloat x, GLfloat y, GLfloat w, GLfloat h)
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{
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const float v[4] = { x, y, w, h };
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glViewportArrayv(index, 1, v);
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}]]></programlisting>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>index</parameter> is greater than or equal to
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the value of <constant>GL_MAX_VIEWPORTS</constant>.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if either <parameter>width</parameter> or <parameter>height</parameter> is negative.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_VIEWPORT</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAX_VIEWPORT_DIMS</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_VIEWPORT_BOUNDS_RANGE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_VIEWPORT_SUBPIXEL_BITS</constant>
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glDepthRange</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glViewport</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glViewportArray</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 2010 Khronos Group.
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This material may be distributed subject to the terms and conditions set forth in
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the Open Publication License, v 1.0, 8 June 1999.
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<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
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</para>
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</refsect1>
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</refentry>
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