2013-10-10 23:58:54 +00:00
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<?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="glTexBuffer">
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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>glTexBuffer</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glTexBuffer</refname>
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<refpurpose>attach the storage for a buffer object to the active buffer texture</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>glTexBuffer</function></funcdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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<paramdef>GLenum <parameter>internalFormat</parameter></paramdef>
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<paramdef>Gluint<parameter>buffer</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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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>target</parameter></term>
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<listitem>
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<para>
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Specifies the target of the operation and must be <constant>GL_TEXTURE_BUFFER</constant>.
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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 of the data in the store belonging to <parameter>buffer</parameter>.
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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>buffer</parameter></term>
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<listitem>
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<para>
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Specifies the name of the buffer object whose storage to attach to the active buffer texture.
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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>glTexBuffer</function> attaches the storage for the buffer object named <parameter>buffer</parameter> to the active
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buffer texture, and specifies the internal format for the texel array found in the attached buffer object. If <parameter>buffer</parameter>
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is zero, any buffer object attached to the buffer texture is detached and no new buffer object is attached. If <parameter>buffer</parameter>
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is non-zero, it must be the name of an existing buffer object. <parameter>target</parameter> must be <constant>GL_TEXTURE_BUFFER</constant>.
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<parameter>internalformat</parameter> specifies the storage format, and must be one of the following sized internal formats:
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</para>
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<informaltable frame="topbot">
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<tgroup cols="8" 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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<colspec colnum="3" colname="col3" colwidth="1.5*"/>
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<colspec colnum="4" colname="col4" colwidth="1*"/>
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<colspec colnum="5" colname="col5" colwidth="1*"/>
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<colspec colnum="6" colname="col6" colwidth="2*"/>
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<colspec colnum="7" colname="col7" colwidth="1.5*"/>
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<colspec colnum="8" colname="col8" colwidth="1*"/>
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<thead>
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<row>
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<entry morerows="1" rowsep="1" align="center"></entry>
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<entry morerows="1" rowsep="1" align="center"></entry>
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<entry morerows="1" rowsep="1" align="center"></entry>
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<entry morerows="1" rowsep="1" align="center"></entry>
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<entry namest="col5" nameend="col8" rowsep="1" align="left"><emphasis role="bold">
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Component
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</emphasis></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 align="left"><emphasis role="bold">Sized Internal Format</emphasis></entry>
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<entry align="left"><emphasis role="bold">Base Type</emphasis></entry>
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<entry align="left"><emphasis role="bold">Components</emphasis></entry>
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<entry align="left"><emphasis role="bold">Norm</emphasis></entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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<entry align="center">2</entry>
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<entry align="center">3</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_R8</constant></entry>
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<entry align="left">ubyte</entry>
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<entry align="left">1</entry>
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<entry align="left">YES</entry>
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<entry align="center">R</entry>
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<entry align="center">0</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_R16</constant></entry>
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<entry align="left">ushort</entry>
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<entry align="left">1</entry>
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<entry align="left">YES</entry>
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<entry align="center">R</entry>
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<entry align="center">0</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_R16F</constant></entry>
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<entry align="left">half</entry>
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<entry align="left">1</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">0</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_R32F</constant></entry>
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<entry align="left">float</entry>
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<entry align="left">1</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">0</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_R8I</constant></entry>
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<entry align="left">byte</entry>
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<entry align="left">1</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">0</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_R16I</constant></entry>
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<entry align="left">short</entry>
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<entry align="left">1</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">0</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_R32I</constant></entry>
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<entry align="left">int</entry>
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<entry align="left">1</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">0</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_R8UI</constant></entry>
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<entry align="left">ubyte</entry>
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<entry align="left">1</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">0</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_R16UI</constant></entry>
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<entry align="left">ushort</entry>
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<entry align="left">1</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">0</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_R32UI</constant></entry>
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<entry align="left">uint</entry>
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<entry align="left">1</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">0</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_RG8</constant></entry>
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<entry align="left">ubyte</entry>
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<entry align="left">2</entry>
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<entry align="left">YES</entry>
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<entry align="center">R</entry>
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<entry align="center">G</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_RG16</constant></entry>
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<entry align="left">ushort</entry>
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<entry align="left">2</entry>
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<entry align="left">YES</entry>
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<entry align="center">R</entry>
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<entry align="center">G</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_RG16F</constant></entry>
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<entry align="left">half</entry>
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<entry align="left">2</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">G</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_RG32F</constant></entry>
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<entry align="left">float</entry>
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<entry align="left">2</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">G</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_RG8I</constant></entry>
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<entry align="left">byte</entry>
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<entry align="left">2</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">G</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_RG16I</constant></entry>
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<entry align="left">short</entry>
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<entry align="left">2</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">G</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_RG32I</constant></entry>
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<entry align="left">int</entry>
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<entry align="left">2</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
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<entry align="center">G</entry>
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<entry align="center">0</entry>
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<entry align="center">1</entry>
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</row>
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<row>
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<entry align="left"><constant>GL_RG8UI</constant></entry>
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<entry align="left">ubyte</entry>
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<entry align="left">2</entry>
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<entry align="left">NO</entry>
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<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">0</entry>
|
|
|
|
|
|
<entry align="center">1</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RG16UI</constant></entry>
|
|
|
|
|
|
<entry align="left">ushort</entry>
|
|
|
|
|
|
<entry align="left">2</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">0</entry>
|
|
|
|
|
|
<entry align="center">1</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RG32UI</constant></entry>
|
|
|
|
|
|
<entry align="left">uint</entry>
|
|
|
|
|
|
<entry align="left">2</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">0</entry>
|
|
|
|
|
|
<entry align="center">1</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGB32F</constant></entry>
|
|
|
|
|
|
<entry align="left">float</entry>
|
|
|
|
|
|
<entry align="left">3</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">1</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGB32I</constant></entry>
|
|
|
|
|
|
<entry align="left">int</entry>
|
|
|
|
|
|
<entry align="left">3</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">1</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGB32UI</constant></entry>
|
|
|
|
|
|
<entry align="left">uint</entry>
|
|
|
|
|
|
<entry align="left">3</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">1</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGBA8</constant></entry>
|
|
|
|
|
|
<entry align="left">uint</entry>
|
|
|
|
|
|
<entry align="left">4</entry>
|
|
|
|
|
|
<entry align="left">YES</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">A</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGBA16</constant></entry>
|
|
|
|
|
|
<entry align="left">short</entry>
|
|
|
|
|
|
<entry align="left">4</entry>
|
|
|
|
|
|
<entry align="left">YES</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">A</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGBA16F</constant></entry>
|
|
|
|
|
|
<entry align="left">half</entry>
|
|
|
|
|
|
<entry align="left">4</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">A</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGBA32F</constant></entry>
|
|
|
|
|
|
<entry align="left">float</entry>
|
|
|
|
|
|
<entry align="left">4</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">A</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGBA8I</constant></entry>
|
|
|
|
|
|
<entry align="left">byte</entry>
|
|
|
|
|
|
<entry align="left">4</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">A</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGBA16I</constant></entry>
|
|
|
|
|
|
<entry align="left">short</entry>
|
|
|
|
|
|
<entry align="left">4</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">A</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGBA32I</constant></entry>
|
|
|
|
|
|
<entry align="left">int</entry>
|
|
|
|
|
|
<entry align="left">4</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">A</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGBA8UI</constant></entry>
|
|
|
|
|
|
<entry align="left">ubyte</entry>
|
|
|
|
|
|
<entry align="left">4</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">A</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGBA16UI</constant></entry>
|
|
|
|
|
|
<entry align="left">ushort</entry>
|
|
|
|
|
|
<entry align="left">4</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">A</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
<row>
|
|
|
|
|
|
<entry align="left"><constant>GL_RGBA32UI</constant></entry>
|
|
|
|
|
|
<entry align="left">uint</entry>
|
|
|
|
|
|
<entry align="left">4</entry>
|
|
|
|
|
|
<entry align="left">NO</entry>
|
|
|
|
|
|
<entry align="center">R</entry>
|
|
|
|
|
|
<entry align="center">G</entry>
|
|
|
|
|
|
<entry align="center">B</entry>
|
|
|
|
|
|
<entry align="center">A</entry>
|
|
|
|
|
|
</row>
|
|
|
|
|
|
</tbody>
|
|
|
|
|
|
</tgroup>
|
|
|
|
|
|
</informaltable>
|
|
|
|
|
|
<para>
|
|
|
|
|
|
When a buffer object is attached to a buffer texture, the buffer object's data store
|
|
|
|
|
|
is taken as the texture's texel array. The number of texels in the buffer texture's
|
|
|
|
|
|
texel array is given by
|
|
|
|
|
|
</para>
|
|
|
|
|
|
<inlineequation>
|
|
|
|
|
|
<mml:apply><mml:floor />
|
|
|
|
|
|
<mml:mfrac>
|
|
|
|
|
|
<mml:mrow>
|
|
|
|
|
|
<mml:mi>buffer_size</mml:mi>
|
|
|
|
|
|
</mml:mrow>
|
|
|
|
|
|
<mml:mrow>
|
|
|
|
|
|
<mml:mi>components</mml:mi><mml:mo> </mml:mo><mml:csymbol><mml:mo>×</mml:mo></mml:csymbol><mml:mo> </mml:mo><mml:mi>sizeof</mml:mi><mml:mo>(</mml:mo><mml:mi>base_type</mml:mi><mml:mo>)</mml:mo>
|
|
|
|
|
|
</mml:mrow>
|
|
|
|
|
|
</mml:mfrac>
|
|
|
|
|
|
</mml:apply>
|
|
|
|
|
|
</inlineequation>
|
|
|
|
|
|
<para>
|
|
|
|
|
|
where <emphasis>buffer_size</emphasis> is the size of the buffer object, in basic machine units and
|
|
|
|
|
|
components and base type are the element count and base data type for elements, as specified in the table above.
|
|
|
|
|
|
The number of texels in the texel array is then clamped to the implementation-dependent limit <constant>GL_MAX_TEXTURE_BUFFER_SIZE</constant>.
|
|
|
|
|
|
When a buffer texture is accessed in a shader, the results of a texel fetch are undefined if the specified texel coordinate is negative, or
|
|
|
|
|
|
greater than or equal to the clamped number of texels in the texel array.
|
|
|
|
|
|
</para>
|
|
|
|
|
|
</refsect1>
|
|
|
|
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
|
|
|
|
<para>
|
|
|
|
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not <constant>GL_TEXTURE_BUFFER</constant>.
|
|
|
|
|
|
</para>
|
|
|
|
|
|
<para>
|
|
|
|
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>internalFormat</parameter> is not one of the accepted tokens.
|
|
|
|
|
|
</para>
|
|
|
|
|
|
<para>
|
|
|
|
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>buffer</parameter> is not zero or the name of an existing buffer object.
|
|
|
|
|
|
</para>
|
|
|
|
|
|
</refsect1>
|
|
|
|
|
|
<refsect1 id="notes"><title>Notes</title>
|
|
|
|
|
|
<para>
|
|
|
|
|
|
<function>glTexBuffer</function> is available only if the GL version is 3.1 or greater.
|
|
|
|
|
|
</para>
|
|
|
|
|
|
</refsect1>
|
|
|
|
|
|
<refsect1 id="associatedgets"><title>Associated Gets</title>
|
|
|
|
|
|
<para><citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
|
|
|
|
|
|
with argument <constant>GL_MAX_TEXTURE_BUFFER_SIZE</constant></para>
|
|
|
|
|
|
<para><citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
|
|
|
|
|
|
with argument <constant>GL_TEXTURE_BINDING_BUFFER</constant></para>
|
|
|
|
|
|
<para><citerefentry><refentrytitle>glGetTexLevelParameter</refentrytitle></citerefentry>
|
|
|
|
|
|
with argument <constant>GL_TEXTURE_BUFFER_DATA_STORE_BINDING</constant></para>
|
|
|
|
|
|
</refsect1>
|
|
|
|
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
|
|
|
|
<para>
|
|
|
|
|
|
<citerefentry><refentrytitle>glGenBuffers</refentrytitle></citerefentry>,
|
|
|
|
|
|
<citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>,
|
|
|
|
|
|
<citerefentry><refentrytitle>glBufferData</refentrytitle></citerefentry>,
|
|
|
|
|
|
<citerefentry><refentrytitle>glDeleteBuffers</refentrytitle></citerefentry>,
|
|
|
|
|
|
<citerefentry><refentrytitle>glGenTextures</refentrytitle></citerefentry>,
|
|
|
|
|
|
<citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>,
|
|
|
|
|
|
<citerefentry><refentrytitle>glDeleteTextures</refentrytitle></citerefentry>
|
|
|
|
|
|
</para>
|
|
|
|
|
|
</refsect1>
|
|
|
|
|
|
<refsect1 id="Copyright"><title>Copyright</title>
|
|
|
|
|
|
<para>
|
|
|
|
|
|
Copyright <trademark class="copyright"></trademark> 2010 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>
|
