sdk/2.1/docs/man/xhtml/cl_image_desc.html - external/github.com/KhronosGroup/OpenCL-Registry - Git at Google

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 </style>
     <title>cl_image_desc</title>
     <meta name="generator" content="DocBook XSL Stylesheets V1.79.1" />
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     <div class="refentry">
       <a id="id-1"></a>
       <div class="titlepage"></div>
       <div xmlns="" class="refnamediv">
         <a xmlns="http://www.w3.org/1999/xhtml" id="cl_image_desc"></a>
         <h1>cl_image_desc</h1>
         <p>
             The image descriptor structure describes the type and dimensions of the image or image array and is defined as:
         </p>
       </div>
       <div class="refsect2">
         <a id="synopsis"></a>
         <h3>
         </h3>
         <div class="informaltable">
           <table class="informaltable" border="0">
             <colgroup>
               <col align="left" class="col1" />
             </colgroup>
             <tbody>
               <tr>
                 <td align="left">typedef struct _cl_image_desc {
           <a class="link" href="enums.html#cl_mem_object_type" target="pagedisplay">cl_mem_object_type</a> image_type;
           <a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> image_width;
           <a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> image_height;
           <a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> image_depth;
           <a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> image_array_size;
           <a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> image_row_pitch;
           <a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> image_slice_pitch;
           <a class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> num_mip_levels;
           <a class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> num_samples;
           <a class="link" href="abstractDataTypes.html" target="pagedisplay">cl_mem</a> buffer;
 } cl_image_desc;</td>
               </tr>
             </tbody>
           </table>
         </div>
       </div>
       <div class="refsect1">
         <a id="parameters"></a>
         <h2>Members</h2>
         <div class="variablelist">
           <dl class="variablelist">
             <dt>
               <span class="term">image_type</span>
             </dt>
             <dd>
               <p>
                       Describes the image type and must be either
                       <code class="constant">CL_MEM_OBJECT_IMAGE1D</code>,
                       <code class="constant">CL_MEM_OBJECT_IMAGE1D_BUFFER</code>,
                       <code class="constant">CL_MEM_OBJECT_IMAGE1D_ARRAY</code>,
                       <code class="constant">CL_MEM_OBJECT_IMAGE2D</code>,
                       <code class="constant">CL_MEM_OBJECT_IMAGE2D_ARRAY</code>, or
                       <code class="constant">CL_MEM_OBJECT_IMAGE3D</code>.
                     </p>
             </dd>
             <dt>
               <span class="term">image_width</span>
             </dt>
             <dd>
               <p>
                       The width of the image in pixels. For a 2D image and image array, the image
                         width must be a value &gt;= 1 and ≤ <code class="constant">CL_DEVICE_IMAGE2D_MAX_WIDTH</code>. For a 3D image, the
                         image width must be a value ≥ 1 and ≤ <code class="constant">CL_DEVICE_IMAGE3D_MAX_WIDTH</code>. For a 1D
                         image buffer, the image width must be a value ≥ 1 and ≤
                         <code class="constant">CL_DEVICE_IMAGE_MAX_BUFFER_SIZE</code>. For a 1D image and 1D image array, the image
                         width must be a value ≥ 1 and ≤ <code class="constant">CL_DEVICE_IMAGE2D_MAX_WIDTH</code>.
                     </p>
             </dd>
             <dt>
               <span class="term">image_height</span>
             </dt>
             <dd>
               <p>
                       The height of the image in pixels. This is
                       only used if the image is a 2D or 3D image, or a
                       2D image array. For a 2D image or image array,
                       the image height must be a value ≥ 1 and ≤
                       <code class="constant">CL_DEVICE_IMAGE2D_MAX_HEIGHT</code>.
                       For a 3D image, the image height must be a value ≥ 1
                       and ≤ <code class="constant">CL_DEVICE_IMAGE3D_MAX_HEIGHT</code>.
                     </p>
             </dd>
             <dt>
               <span class="term">image_depth</span>
             </dt>
             <dd>
               <p>
                       The depth of the image in pixels. This is only used if the
                       image is a 3D image and must be a value ≥ 1 and ≤
                       <code class="constant">CL_DEVICE_IMAGE3D_MAX_DEPTH</code>.
                     </p>
             </dd>
             <dt>
               <span class="term">image_array_size</span>
             </dt>
             <dd>
               <p>
                       The number of images in the image array. This is only
                       used if the image is a 1D or 2D image array. The values for
                       <code class="varname">image_array_size</code>, if specified, must be a value ≥
                       1 and ≤ <code class="constant">CL_DEVICE_IMAGE_MAX_ARRAY_SIZE</code>.
                     </p>
               <p>
                       Note that reading and writing 2D image arrays from a kernel with
                       <code class="varname">image_array_size</code> = 1 may be lower performance than
                       2D images.
                     </p>
             </dd>
             <dt>
               <span class="term">image_row_pitch</span>
             </dt>
             <dd>
               <p>
                       The scan-line pitch in bytes. This must be 0 if <code class="varname">host_ptr</code>
                       is NULL and can be either 0 or ≥ <code class="varname">image_width</code> * size of element in bytes if
                       <code class="varname">host_ptr</code> is not NULL. If <code class="varname">host_ptr</code>
                       is not NULL and <code class="varname">image_row_pitch</code> =
                       0, <code class="varname">image_row_pitch</code> is calculated as
                       <code class="varname">image_width</code> * size of element in bytes. If
                       <code class="varname">image_row_pitch</code> is not 0, it must be a multiple of
                       the image element size in bytes. For a 2D image created from a buffer, the pitch
 specified (or computed if pitch specified is 0) must be a multiple of the maximum of the
 <code class="constant">CL_DEVICE_IMAGE_PITCH_ALIGNMENT</code> value for all devices in the context associated with
 <code class="code">image_desc-&gt;mem_object</code> and that support images.
                     </p>
             </dd>
             <dt>
               <span class="term">image_slice_pitch</span>
             </dt>
             <dd>
               <p>
                       The size in bytes of each 2D slice in the 3D image or the size in
                       bytes of each image in a 1D or 2D image array. This must be 0 if
                       <code class="varname">host_ptr</code> is NULL. If <code class="varname">host_ptr</code>
                       is not NULL, <code class="varname">image_slice_pitch</code> can
                       be either 0 or ≥ <code class="varname">image_row_pitch</code> *
                       <code class="varname">image_height</code> for a 2D image array or 3D image
                       and can be either 0 or ≥ <code class="varname">image_row_pitch</code>
                       for a 1D image array. If <code class="varname">host_ptr</code>
                       is not NULL and <code class="varname">image_slice_pitch</code> =
                       0, <code class="varname">image_slice_pitch</code> is calculated as
                       <code class="varname">image_row_pitch</code> * <code class="varname">image_height</code>
                       for a 2D image array or 3D image and <code class="varname">image_row_pitch</code>
                       for a 1D image array. If <code class="varname">image_slice_pitch</code> is not 0,
                       it must be a multiple of the <code class="varname">image_row_pitch</code>.
                     </p>
             </dd>
             <dt>
               <span class="term">num_mip_level, </span>
               <span class="term">num_samples</span>
             </dt>
             <dd>
               <p>
                       Must be 0.
                     </p>
             </dd>
             <dt>
               <span class="term">mem_object</span>
             </dt>
             <dd>
               <p>
                       Refers to a valid buffer or image memory object. <code class="varname">mem_object</code> can be a buffer
                         memory object if image_type is <code class="constant">CL_MEM_OBJECT_IMAGE1D_BUFFER</code> or
                         <code class="constant">CL_MEM_OBJECT_IMAGE2D</code>
                         (To create a 2D image from a buffer object that share the data store between the image and buffer object)
                         . <code class="varname">mem_object</code> can be a image object if <code class="varname">image_type</code> is
                         <code class="constant">CL_MEM_OBJECT_IMAGE2D</code>
                         (To create an image object from another image object that share the data store between these image objects).
                         Otherwise it must be NULL. The image pixels are taken from
                         the memory object’s data store. When the contents of the specified memory object’s data store
                         are modified, those changes are reflected in the contents of the image object and vice-versa at
                         corresponding sychronization points. For a 1D image buffer object, the <code class="varname">image_width</code> * size
                         of element in bytes must be ≤ size of buffer object data store. For a 2D image created from a
                         buffer, the <code class="varname">image_row_pitch * image_height</code> must be ≤ size of buffer object data
                         store. For an image object created from another image object, the values specified in the image
                         descriptor except for <code class="varname">mem_object</code> must match the image descriptor information associated
                         with <code class="varname">mem_object</code>.
                     </p>
             </dd>
           </dl>
         </div>
       </div>
       <div class="refsect1">
         <a id="note"></a>
         <h2>Note</h2>
         <p>
           Concurrent reading from, writing to and copying between both a buffer object and 1D image
           buffer or 2D image object associated with the buffer object is undefined. Only reading from both
           a buffer object and 1D image buffer or 2D image object associated with the buffer object is defined.
         </p>
         <p>
             Writing to an image created from a buffer and then reading from this buffer in a kernel even if
             appropriate synchronization operations (such as a barrier) are performed between the writes and
             reads is undefined. Similarly, writing to the buffer and reading from the image created from this
             buffer with appropriate synchronization between the writes and reads is undefined.
         </p>
       </div>
       <div class="refsect1">
         <a id="specification"></a>
         <h2>Specification</h2>
         <p>
             <img src="pdficon_small1.gif" />

             <a href="https://www.khronos.org/registry/cl/specs/opencl-2.1.pdf#namedest=cl_image_desc" target="OpenCL Spec">OpenCL Specification</a>
         </p>
       </div>
       <div class="refsect1">
         <a id="seealso"></a>
         <h2>Also see</h2>
         <p>
             <a class="citerefentry" href="cl_image_format.html"><span class="citerefentry"><span class="refentrytitle">cl_image_format</span></span></a>
         </p>
       </div>
       <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2015 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.
 </div>
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	<title>cl_image_desc</title>
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	<div xmlns="" class="refnamediv">
	<a xmlns="http://www.w3.org/1999/xhtml" id="cl_image_desc"></a>
	<h1>cl_image_desc</h1>
	<p>
	The image descriptor structure describes the type and dimensions of the image or image array and is defined as:
	</p>
	</div>
	<div class="refsect2">
	<a id="synopsis"></a>
	<h3>
	</h3>
	<div class="informaltable">
	<table class="informaltable" border="0">
	<colgroup>
	<col align="left" class="col1" />
	</colgroup>
	<tbody>
	<tr>
	<td align="left">typedef struct _cl_image_desc {
	<a class="link" href="enums.html#cl_mem_object_type" target="pagedisplay">cl_mem_object_type</a> image_type;
	<a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> image_width;
	<a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> image_height;
	<a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> image_depth;
	<a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> image_array_size;
	<a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> image_row_pitch;
	<a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> image_slice_pitch;
	<a class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> num_mip_levels;
	<a class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> num_samples;
	<a class="link" href="abstractDataTypes.html" target="pagedisplay">cl_mem</a> buffer;
	} cl_image_desc;</td>
	</tr>
	</tbody>
	</table>
	</div>
	</div>
	<div class="refsect1">
	<a id="parameters"></a>
	<h2>Members</h2>
	<div class="variablelist">
	<dl class="variablelist">
	<dt>
	<span class="term">image_type</span>
	</dt>
	<dd>
	<p>
	Describes the image type and must be either
	<code class="constant">CL_MEM_OBJECT_IMAGE1D</code>,
	<code class="constant">CL_MEM_OBJECT_IMAGE1D_BUFFER</code>,
	<code class="constant">CL_MEM_OBJECT_IMAGE1D_ARRAY</code>,
	<code class="constant">CL_MEM_OBJECT_IMAGE2D</code>,
	<code class="constant">CL_MEM_OBJECT_IMAGE2D_ARRAY</code>, or
	<code class="constant">CL_MEM_OBJECT_IMAGE3D</code>.
	</p>
	</dd>
	<dt>
	<span class="term">image_width</span>
	</dt>
	<dd>
	<p>
	The width of the image in pixels. For a 2D image and image array, the image
	width must be a value >= 1 and ≤ <code class="constant">CL_DEVICE_IMAGE2D_MAX_WIDTH</code>. For a 3D image, the
	image width must be a value ≥ 1 and ≤ <code class="constant">CL_DEVICE_IMAGE3D_MAX_WIDTH</code>. For a 1D
	image buffer, the image width must be a value ≥ 1 and ≤
	<code class="constant">CL_DEVICE_IMAGE_MAX_BUFFER_SIZE</code>. For a 1D image and 1D image array, the image
	width must be a value ≥ 1 and ≤ <code class="constant">CL_DEVICE_IMAGE2D_MAX_WIDTH</code>.
	</p>
	</dd>
	<dt>
	<span class="term">image_height</span>
	</dt>
	<dd>
	<p>
	The height of the image in pixels. This is
	only used if the image is a 2D or 3D image, or a
	2D image array. For a 2D image or image array,
	the image height must be a value ≥ 1 and ≤
	<code class="constant">CL_DEVICE_IMAGE2D_MAX_HEIGHT</code>.
	For a 3D image, the image height must be a value ≥ 1
	and ≤ <code class="constant">CL_DEVICE_IMAGE3D_MAX_HEIGHT</code>.
	</p>
	</dd>
	<dt>
	<span class="term">image_depth</span>
	</dt>
	<dd>
	<p>
	The depth of the image in pixels. This is only used if the
	image is a 3D image and must be a value ≥ 1 and ≤
	<code class="constant">CL_DEVICE_IMAGE3D_MAX_DEPTH</code>.
	</p>
	</dd>
	<dt>
	<span class="term">image_array_size</span>
	</dt>
	<dd>
	<p>
	The number of images in the image array. This is only
	used if the image is a 1D or 2D image array. The values for
	<code class="varname">image_array_size</code>, if specified, must be a value ≥
	1 and ≤ <code class="constant">CL_DEVICE_IMAGE_MAX_ARRAY_SIZE</code>.
	</p>
	<p>
	Note that reading and writing 2D image arrays from a kernel with
	<code class="varname">image_array_size</code> = 1 may be lower performance than
	2D images.
	</p>
	</dd>
	<dt>
	<span class="term">image_row_pitch</span>
	</dt>
	<dd>
	<p>
	The scan-line pitch in bytes. This must be 0 if <code class="varname">host_ptr</code>
	is NULL and can be either 0 or ≥ <code class="varname">image_width</code> * size of element in bytes if
	<code class="varname">host_ptr</code> is not NULL. If <code class="varname">host_ptr</code>
	is not NULL and <code class="varname">image_row_pitch</code> =
	0, <code class="varname">image_row_pitch</code> is calculated as
	<code class="varname">image_width</code> * size of element in bytes. If
	<code class="varname">image_row_pitch</code> is not 0, it must be a multiple of
	the image element size in bytes. For a 2D image created from a buffer, the pitch
	specified (or computed if pitch specified is 0) must be a multiple of the maximum of the
	<code class="constant">CL_DEVICE_IMAGE_PITCH_ALIGNMENT</code> value for all devices in the context associated with
	<code class="code">image_desc->mem_object</code> and that support images.
	</p>
	</dd>
	<dt>
	<span class="term">image_slice_pitch</span>
	</dt>
	<dd>
	<p>
	The size in bytes of each 2D slice in the 3D image or the size in
	bytes of each image in a 1D or 2D image array. This must be 0 if
	<code class="varname">host_ptr</code> is NULL. If <code class="varname">host_ptr</code>
	is not NULL, <code class="varname">image_slice_pitch</code> can
	be either 0 or ≥ <code class="varname">image_row_pitch</code> *
	<code class="varname">image_height</code> for a 2D image array or 3D image
	and can be either 0 or ≥ <code class="varname">image_row_pitch</code>
	for a 1D image array. If <code class="varname">host_ptr</code>
	is not NULL and <code class="varname">image_slice_pitch</code> =
	0, <code class="varname">image_slice_pitch</code> is calculated as
	<code class="varname">image_row_pitch</code> * <code class="varname">image_height</code>
	for a 2D image array or 3D image and <code class="varname">image_row_pitch</code>
	for a 1D image array. If <code class="varname">image_slice_pitch</code> is not 0,
	it must be a multiple of the <code class="varname">image_row_pitch</code>.
	</p>
	</dd>
	<dt>
	<span class="term">num_mip_level, </span>
	<span class="term">num_samples</span>
	</dt>
	<dd>
	<p>
	Must be 0.
	</p>
	</dd>
	<dt>
	<span class="term">mem_object</span>
	</dt>
	<dd>
	<p>
	Refers to a valid buffer or image memory object. <code class="varname">mem_object</code> can be a buffer
	memory object if image_type is <code class="constant">CL_MEM_OBJECT_IMAGE1D_BUFFER</code> or
	<code class="constant">CL_MEM_OBJECT_IMAGE2D</code>
	(To create a 2D image from a buffer object that share the data store between the image and buffer object)
	. <code class="varname">mem_object</code> can be a image object if <code class="varname">image_type</code> is
	<code class="constant">CL_MEM_OBJECT_IMAGE2D</code>
	(To create an image object from another image object that share the data store between these image objects).
	Otherwise it must be NULL. The image pixels are taken from
	the memory object’s data store. When the contents of the specified memory object’s data store
	are modified, those changes are reflected in the contents of the image object and vice-versa at
	corresponding sychronization points. For a 1D image buffer object, the <code class="varname">image_width</code> * size
	of element in bytes must be ≤ size of buffer object data store. For a 2D image created from a
	buffer, the <code class="varname">image_row_pitch * image_height</code> must be ≤ size of buffer object data
	store. For an image object created from another image object, the values specified in the image
	descriptor except for <code class="varname">mem_object</code> must match the image descriptor information associated
	with <code class="varname">mem_object</code>.
	</p>
	</dd>
	</dl>
	</div>
	</div>
	<div class="refsect1">
	<a id="note"></a>
	<h2>Note</h2>
	<p>
	Concurrent reading from, writing to and copying between both a buffer object and 1D image
	buffer or 2D image object associated with the buffer object is undefined. Only reading from both
	a buffer object and 1D image buffer or 2D image object associated with the buffer object is defined.
	</p>
	<p>
	Writing to an image created from a buffer and then reading from this buffer in a kernel even if
	appropriate synchronization operations (such as a barrier) are performed between the writes and
	reads is undefined. Similarly, writing to the buffer and reading from the image created from this
	buffer with appropriate synchronization between the writes and reads is undefined.
	</p>
	</div>
	<div class="refsect1">
	<a id="specification"></a>
	<h2>Specification</h2>
	<p>
	<img src="pdficon_small1.gif" />

	<a href="https://www.khronos.org/registry/cl/specs/opencl-2.1.pdf#namedest=cl_image_desc" target="OpenCL Spec">OpenCL Specification</a>
	</p>
	</div>
	<div class="refsect1">
	<a id="seealso"></a>
	<h2>Also see</h2>
	<p>
	<a class="citerefentry" href="cl_image_format.html"><span class="citerefentry"><span class="refentrytitle">cl_image_format</span></span></a>
	</p>
	</div>
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	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
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