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161 lines
8.7 KiB
XML
161 lines
8.7 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="glBindImageTextures">
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<refmeta>
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<refmetainfo>
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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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</refmetainfo>
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<refentrytitle>glBindImageTextures</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glBindImageTextures</refname>
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<refpurpose>bind one or more named texture images to a sequence of consecutive image units</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>glBindImageTextures</function></funcdef>
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<paramdef>GLuint <parameter>first</parameter></paramdef>
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<paramdef>GLsizei <parameter>count</parameter></paramdef>
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<paramdef>const GLuint *<parameter>textures</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>first</parameter></term>
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<listitem>
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<para>
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Specifies the first image unit to which a texture is to be bound.
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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>count</parameter></term>
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<listitem>
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<para>
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Specifies the number of textures to bind.
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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>textures</parameter></term>
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<listitem>
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<para>
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Specifies the address of an array of names of existing texture objects.
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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>glBindImageTextures</function> binds images from an array of existing texture objects to a specified
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number of consecutive image units. <parameter>count</parameter> specifies the number of texture
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objects whose names are stored in the array <parameter>textures</parameter>. That number
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of texture names are read from the array and bound to the <parameter>count</parameter> consecutive
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texture units starting from <parameter>first</parameter>.
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If the name zero appears in the <parameter>textures</parameter> array, any existing binding
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to the image unit is reset. Any non-zero entry in <parameter>textures</parameter> must be the
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name of an existing texture object. When a non-zero entry in <parameter>textures</parameter> is
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present, the image at level zero is bound, the binding is considered layered, with the first
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layer set to zero, and the image is bound for read-write access. The image unit format
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parameter is taken from the internal format of the image at level zero of the texture object.
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For cube map textures, the internal format of the positive X image of level zero is used.
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If <parameter>textures</parameter> is <constant>NULL</constant> then it is as
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if an appropriately sized array containing only zeros had been specified.
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</para>
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<para>
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<function>glBindImageTextures</function> is equivalent to the following pseudo code:
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</para>
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<programlisting><![CDATA[ for (i = 0; i < count; i++) {
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if (textures == NULL || textures[i] = 0) {
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glBindImageTexture(first + i, 0, 0, GL_FALSE, 0, GL_READ_ONLY, GL_R8);
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} else {
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glBindImageTexture(first + i, textures[i], 0, GL_TRUE, 0, GL_READ_WRITE, lookupInternalFormat(textures[i]));
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}
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}]]></programlisting>
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<para>
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Each entry in <parameter>textures</parameter> will be checked individually and if found
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to be invalid, the state for that image unit will not be changed and an error will be
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generated. However, the state for other texture image units referenced by the command will still
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be updated.
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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<function>glBindImageTextures</function> is available only if the GL version is 4.4 or higher.
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</para>
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<para>
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Note that because <function>glBindImageTextures</function> cannot create new textures (even if
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a name passed has been previously generated by call to <citerefentry><refentrytitle>glGenTextures</refentrytitle></citerefentry>),
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names pased to <function>glBindTextures</function> must have been bound at least once previously
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via a call to <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>.
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</para>
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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_OPERATION</constant> is generated if <parameter>first</parameter> + <parameter>count</parameter> is greater
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than the number of image units supported by the implementation.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if any value in <parameter>textures</parameter> is
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not zero or the name of an existing texture object.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> error is generated if the internal format of the
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level zero texture image of any texture in textures is not supported.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> error is generated if the width, height, or depth
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of the level zero texture image of any texture in textures is zero.
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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_TEXTURE_BINDING_1D</constant>,
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<constant>GL_TEXTURE_BINDING_2D</constant>, <constant>GL_TEXTURE_BINDING_3D</constant>, <constant>GL_TEXTURE_BINDING_1D_ARRAY</constant>,
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<constant>GL_TEXTURE_BINDING_2D_ARRAY</constant>, <constant>GL_TEXTURE_BINDING_RECTANGLE</constant>,
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<constant>GL_TEXTURE_BINDING_BUFFER</constant>, <constant>GL_TEXTURE_BINDING_CUBE_MAP</constant>, <constant>GL_TEXTURE_BINDING_CUBE_MAP</constant>,
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<constant>GL_TEXTURE_BINDING_CUBE_MAP_ARRAY</constant>,
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<constant>GL_TEXTURE_BINDING_2D_MULTISAMPLE</constant>,
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or <constant>GL_TEXTURE_BINDING_2D_MULTISAMPLE_ARRAY</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>glBindTexture</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glBindTextures</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDeleteTextures</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGenTextures</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetTexParameter</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glIsTexture</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexStorage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexStorage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexStorage2DMultisample</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexStorage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexStorage3DMultisample</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexBuffer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexParameter</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> 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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<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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