sdk/1.1/docs/man/get_image_channel_order.xml

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<refentry>
    <refentryinfo>
        <keywordset>
            <keyword>get_image_channel_order</keyword>
        </keywordset>
    </refentryinfo>

    <refmeta>                                    
        <refentrytitle>get_image_channel_order</refentrytitle>

        <refmiscinfo>
            <copyright>
                <year>2007-2010</year>
                <holder>The Khronos Group Inc. 
 Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.</holder>
            </copyright>
        </refmiscinfo>
        <manvolnum>3</manvolnum>
    </refmeta>

<!-- ================================ SYNOPSIS -->

    <refnamediv id="get_image_channel_order">             
        <refname>get_image_channel_order</refname>

        <refpurpose>
            Return the image channel data order.
        </refpurpose>
    </refnamediv>

    <refsynopsisdiv xmlns:xlink="http://www.w3.org/1999/xlink"><title></title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>
                    <link xlink:href="scalarDataTypes.html">int</link>
                    <function>                   
                        get_image_channel_order
                    </function>
                </funcdef>
                <paramdef><link xlink:href="otherDataTypes.html">image2d_t</link><parameter>image</parameter></paramdef>    
            </funcprototype>
        </funcsynopsis>     

        <funcsynopsis>
            <funcprototype>
                <funcdef>
                    <link xlink:href="scalarDataTypes.html">int</link>
                    <function>                   
                        get_image_channel_order
                    </function>
                </funcdef>
                <paramdef><link xlink:href="otherDataTypes.html">image3d_t</link><parameter>image</parameter></paramdef>    
            </funcprototype>
        </funcsynopsis>     
        
    </refsynopsisdiv>       

<!-- ================================ DESCRIPTION  -->

    <refsect1 id="description"><title>Description</title>
        <para>
            Return the image channel order. Valid values are:<literallayout>
CLK_A
CLK_R
CLK_Rx
CLK_RG
CLK_RGx
CLK_RA
CLK_RGB
CLK_RGBx
CLK_RGBA
CLK_ARGB
CLK_BGRA
CLK_INTENSITY
CLK_LUMINANCE</literallayout>
        </para>
    </refsect1>

<!-- ================================ NOTES  -->

    <refsect1 id="notes"><title>Notes</title>
        <para>
        The values returned by <function>get_image_channel_order</function> as
shown above with the CLK_ prefixes correspond to the CL_ prefixes used to describe
the image channel order and data type in the table of supported names and values in 
<citerefentry><refentrytitle>clCreateSubBuffer</refentrytitle></citerefentry> and 
list of supported Image Channel Order Values for <citerefentry><refentrytitle>clCreateImage3D</refentrytitle></citerefentry>.
For example, both
CL_UNORM_INT8 and CLK_UNORM_INT8 refer to an image channel data type that is an
unnormalized unsigned 8-bit integer.
        </para>
        <para>
      The following table describes the mapping of the number of channels of an image element to the appropriate components in the float4, int4 or uint4 vector data type for the color values returned by <function>read_image{f|i|ui}</function> or supplied to <function>write_image{f|i|ui}</function>. The unmapped components will be set to <constant>0.0</constant> for red, green and blue channels and will be set to <constant>1.0</constant> for the alpha channel.
        </para>
        <para>
        <informaltable frame="all">
            <tgroup cols="2" align="center" colsep="1" rowsep="1">
                <colspec colname="col1" colnum="1" />
                <colspec colname="col2" colnum="2" />
                <thead>
                    <row>
                        <entry>Channel Order</entry>
                        <entry>float4, int4 or unsigned int4 components of channel data</entry>
                    </row>
                </thead>
                <tbody>
                    <row>
                        <entry><constant>CL_R</constant>, <constant>CL_Rx</constant></entry>
                        <entry><constant>(r, 0.0, 0.0, 1.0)</constant></entry>
                    </row>
                    <row>
                        <entry><constant>CL_A</constant></entry>
                        <entry><constant>(0.0, 0.0, 0.0, a)</constant></entry>
                    </row>
                    <row>
                        <entry><constant>CL_RG</constant>, <constant>CL_RGx</constant></entry>
                        <entry><constant>(r, g, 0.0, 1.0)</constant></entry>
                    </row>
                    <row>
                        <entry><constant>CL_RA</constant></entry>
                        <entry><constant>(r, 0.0, 0.0, a)</constant></entry>
                    </row>
                    <row>
                        <entry><constant>CL_RGB</constant>, <constant>CL_RGBx</constant></entry>
                        <entry><constant>(r, g, b, 1.0)</constant></entry>
                    </row>
                    <row>
                        <entry><constant>CL_RGBA, CL_BGRA, CL_ARGB</constant></entry>
                        <entry><constant>(r, g, b, a)</constant></entry>
                    </row>
                    <row>
                        <entry><constant>CL_INTENSITY</constant></entry>
                        <entry><constant>(I, I, I, I)</constant></entry>
                    </row>
                    <row>
                        <entry><constant>CL_LUMINANCE</constant></entry>
                        <entry><constant>(L, L, L, 1.0)</constant></entry>
                    </row>
                </tbody>    
            </tgroup>
        </informaltable>
        </para>
        <para>
        A kernel that uses a sampler with the CL_ADDRESS_CLAMP addressing mode with
multiple images may result in additional samplers being used internally by an implementation. If
the same sampler is used with multiple images called via 
<citerefentry href="read_imagef2d"><refentrytitle>read_image{f | i | ui}</refentrytitle></citerefentry>, then it is
possible that an implementation may need to allocate an additional sampler to handle the
different border color values that may be needed depending on the image formats being used.
These implementation allocated samplers will count against the maximum sampler values
supported by the device and given by CL_DEVICE_MAX_SAMPLERS. Enqueuing a kernel that
requires more samplers than the implementation can support will result in a
CL_OUT_OF_RESOURCES error being returned.
        </para>
    </refsect1>
    
<!-- ================================ EXAMPLE  -->
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    <refsect2 id="example1">
        <title>
            Example
        </title>

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                        <entry>
                            Example goes here - it will be set in "code" type with white space preserved.
                        </entry>
                    </row>
                </tbody>
            </tgroup>
        </informaltable>
    </refsect2>
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<!-- ================================ SPECIFICATION  -->
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    <refsect1 id="specification"><title>Specification</title>
        <para>
            <imageobject>
                <imagedata fileref="pdficon_small1.gif" format="gif" />
            </imageobject>
                                                 
            <olink uri="imageFunctions">OpenCL Specification</olink>
        </para>
    </refsect1>


<!-- ================================ ALSO SEE  -->

    <refsect1 id="seealso"><title>Also see</title>
        <para>
            <citerefentry href="imageFunctions"><refentrytitle>Image Functions</refentrytitle></citerefentry> 
        </para>
    </refsect1>



<!-- ============================== COPYRIGHT -->
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    <refsect3 id="Copyright"><title></title>
        <imageobject>
                <imagedata fileref="KhronosLogo.jpg" format="jpg" />
        </imageobject>
        <para />
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</refentry>