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359 lines
20 KiB
XML
359 lines
20 KiB
XML
<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
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<!-- Converted by db4-upgrade version 1.1 -->
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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glTextureView">
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<info>
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<copyright>
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<year>2013</year>
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<holder>Khronos Group</holder>
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</copyright>
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</info>
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<refmeta>
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<refentrytitle>glTextureView</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glTextureView</refname>
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<refpurpose>initialize a texture as a data alias of another texture's data store</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>glTextureView</function></funcdef>
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<paramdef>GLuint <parameter>texture</parameter></paramdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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<paramdef>GLuint <parameter>origtexture</parameter></paramdef>
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<paramdef>GLenum <parameter>internalformat</parameter></paramdef>
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<paramdef>GLuint <parameter>minlevel</parameter></paramdef>
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<paramdef>GLuint <parameter>numlevels</parameter></paramdef>
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<paramdef>GLuint <parameter>minlayer</parameter></paramdef>
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<paramdef>GLuint <parameter>numlayers</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 xml:id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>texture</parameter></term>
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<listitem>
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<para>
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Specifies the texture object to be initialized as a view.
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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>target</parameter></term>
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<listitem>
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<para>
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Specifies the target to be used for the newly initialized texture.
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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>origtexture</parameter></term>
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<listitem>
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<para>
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Specifies the name of a texture object of which to make a view.
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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>internalFormat</parameter></term>
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<listitem>
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<para>
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Specifies the internal format for the newly created view.
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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>minlevel</parameter></term>
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<listitem>
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<para>
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Specifies lowest level of detail of the view.
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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>numlevels</parameter></term>
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<listitem>
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<para>
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Specifies the number of levels of detail to include in the view.
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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>minlayer</parameter></term>
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<listitem>
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<para>
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Specifies the index of the first layer to include in the view.
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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>numlayers</parameter></term>
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<listitem>
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<para>
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Specifies the number of layers to include in the view.
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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 xml:id="description"><title>Description</title>
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<para>
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<function>glTextureView</function> initializes a texture object as an
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alias, or view of another texture object, sharing some or all of the
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parent texture's data store with the initialized texture. <parameter>texture</parameter>
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specifies a name previously reserved by a successful call to <citerefentry><refentrytitle>glGenTextures</refentrytitle></citerefentry>
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but that has not yet been bound or given a target. <parameter>target</parameter>
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specifies the target for the newly initialized texture and must be compatible
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with the target of the parent texture, given in <parameter>origtexture</parameter>
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as specified in the following table:
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</para>
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<informaltable>
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<tgroup cols="2" align="left">
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<colspec colnum="1" colname="col1" colwidth="1*"/>
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<colspec colnum="2" colname="col2" colwidth="2*"/>
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<thead>
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<row>
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<entry>Original Target</entry>
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<entry>Compatible New Targets</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><constant>GL_TEXTURE_1D</constant></entry>
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<entry><constant>GL_TEXTURE_1D</constant>, <constant>GL_TEXTURE_1D_ARRAY</constant></entry>
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</row>
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<row>
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<entry><constant>GL_TEXTURE_2D</constant></entry>
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<entry><constant>GL_TEXTURE_2D</constant>, <constant>GL_TEXTURE_2D_ARRAY</constant></entry>
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</row>
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<row>
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<entry><constant>GL_TEXTURE_3D</constant></entry>
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<entry><constant>GL_TEXTURE_3D</constant></entry>
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</row>
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<row>
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<entry><constant>GL_TEXTURE_CUBE_MAP</constant></entry>
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<entry><constant>GL_TEXTURE_CUBE_MAP</constant>, <constant>GL_TEXTURE_2D</constant>, <constant>GL_TEXTURE_2D_ARRAY</constant>, <constant>GL_TEXTUER_CUBE_MAP_ARRAY</constant></entry>
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</row>
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<row>
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<entry><constant>GL_TEXTURE_RECTANGLE</constant></entry>
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<entry><constant>GL_TEXTURE_RECTANGLE</constant></entry>
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</row>
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<row>
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<entry><constant>GL_TEXTURE_BUFFER</constant></entry>
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<entry><emphasis>none</emphasis></entry>
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</row>
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<row>
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<entry><constant>GL_TEXTURE_1D_ARRAY</constant></entry>
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<entry><constant>GL_TEXTURE_1D</constant>, <constant>GL_TEXTURE_1D_ARRAY</constant></entry>
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</row>
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<row>
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<entry><constant>GL_TEXTURE_2D_ARRAY</constant></entry>
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<entry><constant>GL_TEXTURE_2D</constant>, <constant>GL_TEXTURE_2D_ARRAY</constant></entry>
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</row>
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<row>
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<entry><constant>GL_TEXTURE_CUBE_MAP_ARRAY</constant></entry>
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<entry><constant>GL_TEXTURE_CUBE_MAP</constant>, <constant>GL_TEXTURE_2D</constant>, <constant>GL_TEXTURE_2D_ARRAY</constant>, <constant>GL_TEXTUER_CUBE_MAP_ARRAY</constant></entry>
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</row>
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<row>
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<entry><constant>GL_TEXTURE_2D_MULTISAMPLE</constant></entry>
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<entry><constant>GL_TEXTURE_2D_MULTISAMPLE</constant>, <constant>GL_TEXTURE_MULTISAMPLE_ARRAY</constant></entry>
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</row>
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<row>
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<entry><constant>GL_TEXTURE_2D_MULTISAMPLE_ARRAY</constant></entry>
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<entry><constant>GL_TEXTURE_2D_MULTISAMPLE</constant>, <constant>GL_TEXTURE_MULTISAMPLE_ARRAY</constant></entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<para>
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The value of <constant>GL_TEXTURE_IMMUTABLE_FORMAT</constant> for <parameter>origtexture</parameter>
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must be <constant>GL_TRUE</constant>.
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After initialization, <parameter>texture</parameter> inherits the data store of
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the parent texture, <parameter>origtexture</parameter> and is usable as a normal
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texture object with target <parameter>target</parameter>. Data in the shared store
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is reinterpreted with the new internal format specified by <parameter>internalformat</parameter>.
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<parameter>internalformat</parameter> must be compatible with the internal format
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of the parent texture as specified in the following table:
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</para>
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<informaltable>
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<tgroup cols="2" align="left">
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<colspec colnum="1" colname="col1" colwidth="1*"/>
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<colspec colnum="2" colname="col2" colwidth="2*"/>
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<thead>
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<row>
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<entry>Class</entry>
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<entry>Internal Formats</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>128-bit</entry>
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<entry><constant>GL_RGBA32F</constant>, <constant>GL_RGBA32UI</constant>, <constant>GL_RGBA32I</constant></entry>
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</row>
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<row>
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<entry>96-bit</entry>
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<entry><constant>GL_RGB32F</constant>, <constant>GL_RGB32UI</constant>, <constant>GL_RGB32I</constant></entry>
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</row>
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<row>
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<entry>64-bit</entry>
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<entry><constant>GL_RGBA16F</constant>, <constant>GL_RG32F</constant>, <constant>GL_RGBA16UI</constant>,
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<constant>GL_RG32UI</constant>, <constant>GL_RGBA16I</constant>, <constant>GL_RG32I</constant>, <constant>GL_RGBA16</constant>, <constant>GL_RGBA16_SNORM</constant></entry>
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</row>
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<row>
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<entry>48-bit</entry>
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<entry><constant>GL_RGB16</constant>, <constant>GL_RGB16_SNORM</constant>, <constant>GL_RGB16F</constant>, <constant>GL_RGB16UI</constant>, <constant>GL_RGB16I</constant></entry>
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</row>
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<row>
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<entry>32-bit</entry>
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<entry><constant>GL_RG16F</constant>, <constant>GL_R11F_G11F_B10F</constant>, <constant>GL_R32F</constant>, <constant>GL_RGB10_A2UI</constant>,
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<constant>GL_RGBA8UI</constant>, <constant>GL_RG16UI</constant>, <constant>GL_R32UI</constant>, <constant>GL_RGBA8I</constant>,
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<constant>GL_RG16I</constant>, <constant>GL_R32I</constant>, <constant>GL_RGB10_A2</constant>, <constant>GL_RGBA8</constant>,
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<constant>GL_RG16</constant>, <constant>GL_RGBA8_SNORM</constant>, <constant>GL_RG16_SNORM</constant>, <constant>GL_SRGB8_ALPHA8</constant>,
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<constant>GL_RGB9_E5</constant></entry>
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</row>
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<row>
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<entry>24-bit</entry>
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<entry><constant>GL_RGB8</constant>, <constant>GL_RGB8_SNORM</constant>, <constant>GL_SRGB8</constant>,
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<constant>GL_RGB8UI</constant>, <constant>GL_RGB8I</constant></entry>
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</row>
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<row>
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<entry>16-bit</entry>
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<entry><constant>GL_R16F</constant>, <constant>GL_RG8UI</constant>, <constant>GL_R16UI</constant>, <constant>GL_RG8I</constant>,
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<constant>GL_R16I</constant>, <constant>GL_RG8</constant>, <constant>GL_R16</constant>, <constant>GL_RG8_SNORM</constant>, <constant>GL_R16_SNORM</constant></entry>
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</row>
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<row>
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<entry>8-bit</entry>
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<entry><constant>GL_R8UI</constant>, <constant>GL_R8I</constant>, <constant>GL_R8</constant>, <constant>GL_R8_SNORM</constant></entry>
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</row>
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<row>
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<entry><constant>GL_RGTC1_RED</constant></entry>
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<entry><constant>GL_COMPRESSED_RED_RGTC1</constant>, <constant>GL_COMPRESSED_SIGNED_RED_RGTC1</constant></entry>
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</row>
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<row>
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<entry><constant>GL_RGTC2_RG</constant></entry>
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<entry><constant>GL_COMPRESSED_RG_RGTC2</constant>, <constant>GL_COMPRESSED_SIGNED_RG_RGTC2</constant></entry>
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</row>
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<row>
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<entry><constant>GL_BPTC_UNORM</constant></entry>
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<entry><constant>GL_COMPRESSED_RGBA_BPTC_UNORM</constant>, <constant>GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM</constant></entry>
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</row>
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<row>
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<entry><constant>GL_BPTC_FLOAT</constant></entry>
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<entry><constant>GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT</constant>, <constant>GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT</constant></entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<para>
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If the original texture is an array or has multiple mipmap levels,
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the parameters <parameter>minlayer</parameter>, <parameter>numlayers</parameter>, <parameter>minlevel</parameter>, and <parameter>numlevels</parameter>
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control which of those slices and levels are considered part of the texture.
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The <parameter>minlevel</parameter> and <parameter>minlayer</parameter> parameters are relative to the view of the
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original texture. If <parameter>numlayers</parameter> or <parameter>numlevels</parameter> extend beyond the original
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texture, they are clamped to the max extent of the original texture.
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</para>
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<para>
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If the new texture's target is <constant>GL_TEXTURE_CUBE_MAP</constant>, the clamped <parameter>numlayers</parameter>
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must be equal to 6. If the new texture's target is <constant>GL_TEXTURE_CUBE_MAP_ARRAY</constant>,
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then <parameter>numlayers</parameter> counts layer-faces rather than layers, and the clamped
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<parameter>numlayers</parameter> must be a multiple of 6. If the new texture's target is <constant>GL_TEXTURE_CUBE_MAP</constant> or
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<constant>GL_TEXTURE_CUBE_MAP_ARRAY</constant>, the width and height of the original texture's
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levels must be equal.
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</para>
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<para>
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When the original texture's target is <constant>GL_TEXTURE_CUBE_MAP</constant>, the layer
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parameters are interpreted in the same order as if it were a
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<constant>GL_TEXTURE_CUBE_MAP_ARRAY</constant> with 6 layer-faces.
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</para>
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<para>
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If <parameter>target</parameter> is <constant>GL_TEXTURE_1D</constant>, <constant>GL_TEXTURE_2D</constant>, <constant>GL_TEXTURE_3D</constant>, <constant>GL_TEXTURE_RECTANGLE</constant>, or
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<constant>GL_TEXTURE_2D_MULTISAMPLE</constant>, <parameter>numlayers</parameter> must equal 1.
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</para>
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<para>
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The dimensions of the original texture must be less than or equal to the maximum
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supported dimensions of the new target. For example, if the original texture has a <constant>GL_TEXTURE_2D_ARRAY</constant>
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target and its width is greater than <constant>GL_MAX_CUBE_MAP_TEXTURE_SIZE</constant>, an error
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will be generated if <function>glTextureView</function> is called to create a <constant>GL_TEXTURE_CUBE_MAP</constant>
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view.
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</para>
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<para>
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Texture commands that take a <parameter>level</parameter> or <parameter>layer</parameter> parameter, such as
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<citerefentry><refentrytitle>glTexSubImage2D</refentrytitle></citerefentry>, interpret that parameter to be relative to the view of the
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texture. i.e. the mipmap level of the data store that would be updated via
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<citerefentry><refentrytitle>TexSubImage2D</refentrytitle></citerefentry> would be the sum of <parameter>level</parameter> and the value of
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<constant>GL_TEXTURE_VIEW_MIN_LEVEL</constant>.
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</para>
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</refsect1>
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<refsect1 xml:id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>minlayer</parameter> or <parameter>minlevel</parameter>
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are larger than the greatest layer or level of <parameter>origtexture</parameter>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>target</parameter> is not compatible
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with the target of <parameter>origtexture</parameter>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if the dimensions of <parameter>origtexture</parameter>
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are greater than the maximum supported dimensions for <parameter>target</parameter>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>internalformat</parameter> is not compatible
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with the internal format of <parameter>origtexture</parameter>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>texture</parameter> has already been bound
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or otherwise given a target.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if the value of <constant>GL_TEXTURE_IMMUTABLE_FORMAT</constant>
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for <parameter>origtexture</parameter> is not <constant>GL_TRUE</constant>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>origtexture</parameter> is not the name of an
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existing texture object.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generaged if <parameter>target</parameter> is <constant>GL_TEXTURE_CUBE_MAP</constant>
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and <parameter>numlayers</parameter> is not 6, or if <parameter>target</parameter> is <constant>GL_TEXTURE_CUBE_MAP_ARRAY</constant>
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and <parameter>numlayers</parameter> is not an integer multiple of 6.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>target</parameter> is <constant>GL_TEXTURE_1D</constant>,
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<constant>GL_TEXTURE_2D</constant>, <constant>GL_TEXTURE_3D</constant>, <constant>GL_TEXTURE_RECTANGLE</constant>, or
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<constant>GL_TEXTURE_2D_MULTISAMPLE</constant> and <parameter>numlayers</parameter> does not equal 1.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>texture</parameter> zero or is not the name of a texture previously
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returned from a successful call to <citerefentry><refentrytitle>glGenTextures</refentrytitle></citerefentry>.
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</para>
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</refsect1>
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<refsect1 xml:id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry> with arguments <constant>GL_TEXTURE_VIEW_MIN_LEVEL</constant>,
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<constant>GL_TEXTURE_VIEW_NUM_LEVELS</constant>, <constant>GL_TEXTURE_VIEW_MIN_LAYER</constant>,
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<constant>GL_TEXTURE_VIEW_NUM_LAYERS</constant>, or <constant>GL_TEXTURE_IMMUTABLE_LEVELS</constant>.
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</para>
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</refsect1>
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<refsect1 xml:id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glTexStorage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexStorage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexStorage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetTexParameter</refentrytitle></citerefentry>.
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</para>
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</refsect1>
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<refsect1 xml:id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"/> 2013 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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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
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</para>
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</refsect1>
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</refentry>
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