sdk/2.0/docs/man/cl_khr_mipmap_image.xml

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<refentry>
    <refentryinfo>
        <keywordset>
            <keyword>cl_khr_mipmap_image</keyword>
        </keywordset>
    </refentryinfo>

    <refmeta>
        <refentrytitle>cl_khr_mipmap_image</refentrytitle>

        <refmiscinfo>
            <copyright>
                <year>2007-2013</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="cl_khr_mipmap_image">
        <refname>cl_khr_mipmap_image</refname>

        <refpurpose>
            Extension adds support for mipmaps.
        </refpurpose>
    </refnamediv>

    <refsect2 id="synopsis">
        <title>
        </title>

        <informaltable frame="none">
            <tgroup cols="1" align="left" colsep="0" rowsep="0">
                <colspec colname="col1" colnum="1" />
                <tbody>
                    <row>
                        <entry>
#pragma OPENCL EXTENSION cl_khr_mipmap_image : enable
                        </entry>
                    </row>
                    <row>
                        <entry>
#pragma OPENCL EXTENSION cl_khr_mipmap_image_writes : enable
                        </entry>
                    </row>
                </tbody>
            </tgroup>
        </informaltable>
    </refsect2>

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

    <refsect1 id="description"><title>Description</title>
        <para>
            This extension adds support for mipmaps. This proposal is implemented 
            as two optional extensions. The <function>cl_khr_mipmap_image</function> 
            extension implements support to create a mipmapped image, enqueue commands 
            to read/write/copy/map a region of a mipmapped image and built-in 
            functions that can be used to read a mip-mapped image in an OpenCL C 
            program. The <function>cl_khr_mipmap_image_writes</function> extension 
            adds built-in functions that can be used to write a mip-mapped image in 
            an OpenCL C program. If the <function>cl_khr_mipmap_image_writes</function> 
            extension is supported by the OpenCL device, the 
            <function>cl_khr_mipmap_image</function> extension must also be supported.
        </para>

        <bridgehead>Additions to section 5.3 – Image Objects:</bridgehead>

        <para>
            A mip-mapped 1D image, 1D image array, 2D image, 2D image array 
            or 3D image is created by specifying <varname>num_mip_levels</varname> 
            to be a value &gt; 1 in <varname>cl_image_desc</varname> passed to 
            <citerefentry><refentrytitle>clCreateImage</refentrytitle></citerefentry>. 
            The dimensions of a mip-mapped image can be a power of two or a 
            non-power of two. Each successively smaller mipmap level is half 
            the size of the previous level. If this half value is a fractional 
            value, it is rounded down to the nearest integer.
        </para>

        <itemizedlist>
            <listitem>
                The following restrictions apply when mip-mapped images are created 
                with <citerefentry><refentrytitle>clCreateImage</refentrytitle></citerefentry>:
            </listitem>

            <listitem>
                <constant>CL_MEM_USE_HOST_PTR</constant> or <constant>CL_MEM_COPY_HOST_PTR</constant> 
                cannot be specified if a mipmapped image is created.
            </listitem>

            <listitem>
                The <varname>host_ptr</varname> argument to 
                <citerefentry><refentrytitle>clCreateImage</refentrytitle></citerefentry> 
                must be a NULL value.
            </listitem>

            <listitem>
                Mip-mapped images cnnot be created for <constant>CL_MEM_OBJECT_IMAGE1D_BUFFER</constant> 
                images and multi-sampled (i.e. msaa) images.
            </listitem>
        </itemizedlist>

        <para>
            Calls to <citerefentry><refentrytitle>clEnqueueReadImage</refentrytitle></citerefentry>, 
            <citerefentry><refentrytitle>clEnqueueWriteImage</refentrytitle></citerefentry>, and 
            <citerefentry><refentrytitle>clEnqueueMapImage</refentrytitle></citerefentry> can be used
            to read from or write to a specific mip-level of a mip-mapped image. 
            If <varname>image</varname> argument is a 1D image, 
            <varname>origin</varname>[1] specifies the mip-level to use. 
            If <varname>image</varname> argument is a 1D image array, 
            <varname>origin</varname>[2] specifies the mip-level to use. 
            If <varname>image</varname> argument is a 2D image, 
            <varname>origin</varname>[3] specifies the mip-level to use. 
            If <varname>image</varname> argument is a 2D image array or a 3D image, 
            <varname>origin</varname>[3] specifies the mip-level to use.
        </para>

        <para>
            Calls to <citerefentry><refentrytitle>clEnqueueCopyImage</refentrytitle></citerefentry>, 
            <citerefentry><refentrytitle>clEnqueueCopyImageToBuffer</refentrytitle></citerefentry>, and
            <citerefentry><refentrytitle>clEnqueueCopyBufferToImage</refentrytitle></citerefentry> can also 
            be used to copy from and to a specific mip-level of a mip-mapped image. 
            If <varname>src_image</varname> argument is a 1D image, 
            <varname>src_origin</varname>[1] specifies the mip-level to use. 
            If <varname>src_image</varname> argument is a 1D image array, 
            <varname>src_origin</varname>[2] specifies the mip-level to use.
            If <varname>src_image</varname> argument is a 2D image, 
            <varname>src_origin</varname>[3] specifies the mip-level to use. 
            If <varname>src_image</varname> argument is a 2D image array or a 3D image, 
            <varname>src_origin</varname>[3] specifies the mip-level to use. 
            If <varname>dst_image</varname> argument is a 1D image, 
            <varname>dst_origin</varname>[1] specifies the mip-level to use. 
            If <varname>dst_image</varname> argument is a 1D image array, 
            <varname>dst_origin</varname>[2] specifies the mip-level to use. 
            If <varname>dst_image</varname> argument is a 2D image, 
            <varname>dst_origin</varname>[3] specifies the mip-level to use. 
            If <varname>dst_image</varname> argument is a 2D image array or a 3D image, 
            <varname>dst_origin</varname>[3] specifies the mip-level to use.
        </para>

        <para>
            If the mip level specified is not a valid value, these functions 
            return the error <errorname>CL_INVALID_MIP_LEVEL</errorname>.
        </para>

        <bridgehead>Additions to section 5.7 – Sampler Objects:</bridgehead>

        <para>
            Add the following sampler properties that can be specified when a sampler object is created using 
            <citerefentry><refentrytitle>clCreateSamplerWithProperties</refentrytitle></citerefentry>.
        </para>

        <informaltable frame="all">
            <tgroup cols="3" align="left" colsep="1" rowsep="1">
                <colspec colname="col1" colnum="1" />
                <colspec colname="col2" colnum="2" />
                <colspec colname="col3" colnum="3" />

                <thead>
                    <row>
                        <entry>cl_sampler_properties enum</entry>
                        <entry>Property Value</entry>
                        <entry>Default Value</entry>
                    </row>
                </thead>

                <tbody>
                    <row>
                        <entry><constant>CL_SAMPLER_MIP_FILTER_MODE</constant></entry>
                        <entry>cl_filter_mode</entry>
                        <entry><constant>CL_FILTER_NONE</constant></entry>
                    </row>

                    <row>
                        <entry><constant>CL_SAMPLER_LOD_MIN</constant></entry>
                        <entry>float</entry>
                        <entry>0.0f</entry>
                    </row>

                    <row>
                        <entry><constant>CL_SAMPLER_LOD_MAX</constant></entry>
                        <entry>float</entry>
                        <entry><constant>MAXFLOAT</constant></entry>
                    </row>

                </tbody>
            </tgroup>
        </informaltable>

        <para>
            NOTE: The sampler properties <constant>CL_SAMPLER_MIP_FILTER_MODE</constant>,
             <constant>CL_SAMPLER_LOD_MIN</constant>, and 
            <constant>CL_SAMPLER_LOD_MAX</constant> cannot be specified with any 
            samplers initialized in the OpenCL program source. Only the default 
            values for these properties will be used. To create a sampler with 
            specific values for these properties, a sampler object must be created with
            <citerefentry><refentrytitle>clCreateSamplerWithProperties</refentrytitle></citerefentry> 
            and passed as an argument to a kernel.
        </para>

        <bridgehead>Additions to section 6.13.14 – Image Read, Write, and Query Functions</bridgehead>

        <para>
            The image read and write functions read from and write to mip-level 
            0 if the <varname>image</varname> argument is a mip-mapped image. 
            New built-in image read, write, and query functions are added to the 
            <citerefentry href="imageFunctions"><refentrytitle>image functions</refentrytitle></citerefentry> 
            available.
        </para>

        <para>
            NOTE: <constant>CL_SAMPLER_NORMALIZED_COORDS</constant> must be 
            <constant>CL_TRUE</constant> for the new built-in read functions 
            referred to above that read from a mip-mapped image; otherwise 
            the behavior is undefined. The value specified in the 
            <varname>lod</varname> argument is clamped to the minimum of 
            (actual number of mip-levels – 1) in the image or value 
            specified for <constant>CL_SAMPLER_LOD_MAX</constant>.
        </para>

        <bridgehead>Additions to section 9.7 – Sharing Memory Objects with OpenGL / OpenGL ES Texture Objects</bridgehead>

        <para>
            If the <function>cl_khr_mipmap_image</function> extension is 
            supported by the OpenCL device, the 
            <citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry> 
            extension adds support for creating a mip-mapped CL image from a mip-mapped GL texture.
        </para>

        <para>
            To create a mip-mapped CL image from a mip-mapped GL texture, the 
            <varname>miplevel</varname> argument to 
            <citerefentry><refentrytitle>clCreateFromGLTexture</refentrytitle></citerefentry> 
            should be a negative value. If <varname>miplevel</varname> is a negative 
            value then a CL mipmapped image object is created from a mipmapped 
            GL texture object instead of a CL image object for a specific 
            miplevel of a GL texture.
        </para>

    </refsect1>

<!-- ================================ EXAMPLE  -->
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        <title>
            Example
        </title>

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                            Example goes here - it will be set in "code" type with white space preserved.
                        </entry>
                    </row>
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<!-- ================================ SPECIFICATION  -->
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    <refsect1 id="specification"><title>Specification</title>
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            <olink uri="cl_khr_mipmap_image">OpenCL Specification</olink>
        </para>
    </refsect1>

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

    <refsect1 id="seealso"><title>Also see</title>
        <para>
            <citerefentry><refentrytitle>EXTENSION</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>clCreateProgramWithBinary</refentrytitle></citerefentry>,
            <citerefentry href="imageFunctions"><refentrytitle>Image Functions</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>clCreateFromGLTexture</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>clEnqueueCopyImage</refentrytitle></citerefentry>, 
            <citerefentry><refentrytitle>clEnqueueCopyImageToBuffer</refentrytitle></citerefentry>, 
            <citerefentry><refentrytitle>clEnqueueCopyBufferToImage</refentrytitle></citerefentry>, 
            <citerefentry><refentrytitle>clEnqueueReadImage</refentrytitle></citerefentry>, 
            <citerefentry><refentrytitle>clEnqueueWriteImage</refentrytitle></citerefentry>,  
            <citerefentry><refentrytitle>clEnqueueMapImage</refentrytitle></citerefentry>, 
            <citerefentry><refentrytitle>clCreateImage</refentrytitle></citerefentry>
        </para>
    </refsect1>

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<!-- 23-Dec-2013, rev. 19 -->
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