sdk/2.2/docs/man/html/cl_image_desc.html - external/github.com/KhronosGroup/OpenCL-Registry - Git at Google

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 </script></head>
 <body class="manpage">
 <div id="header">
 <h1>cl_image_desc(3) Manual Page</h1>
 <h2 id="_name">Name</h2>
 <div class="sectionbody">
 <p>cl_image_desc - The image descriptor structure describes the type and dimensions of the image or image array and is defined as:</p>
 </div>
 </div>
 <div id="content">
 <div class="sect1">
 <h2 id="_c_specification">C Specification</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>The <strong>cl_image_desc</strong> image descriptor structure describes the type and
 dimensions of an image or image array, and is defined as:</p>
 </div>
 <div id="cl_image_desc" class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-c++" data-lang="c++">typedef struct cl_image_desc {
     cl_mem_object_type    image_type;
     size_t                image_width;
     size_t                image_height;
     size_t                image_depth;
     size_t                image_array_size;
     size_t                image_row_pitch;
     size_t                image_slice_pitch;
     cl_uint               num_mip_levels;
     cl_uint               num_samples;
     #ifdef __GNUC__
     __extension__   /* Prevents warnings about anonymous union in -pedantic builds */
 #endif
     union {
         cl_mem buffer;
         cl_mem mem_object;
     };
 } cl_image_desc;</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_members">Members</h2>
 <div class="sectionbody">
 <div class="ulist">
 <ul>
 <li>
 <p><code>image_type</code> describes the image type and must be either
 <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE1D</code>, <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE1D_&#8203;BUFFER</code>,
 <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE1D_&#8203;ARRAY</code>, <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE2D</code>,
 <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE2D_&#8203;ARRAY</code>, or <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE3D</code>.</p>
 </li>
 <li>
 <p><code>image_width</code> is the width of the image in pixels.
 For a 2D image and image array, the image width must be a value ≥ 1 and
 ≤ <code>CL_&#8203;DEVICE_&#8203;IMAGE2D_&#8203;MAX_&#8203;WIDTH</code>.
 For a 3D image, the image width must be a value ≥1 and ≤
 <code>CL_&#8203;DEVICE_&#8203;IMAGE3D_&#8203;MAX_&#8203;WIDTH</code>.
 For a 1D image buffer, the image width must be a value ≥1 and ≤
 <code>CL_&#8203;DEVICE_&#8203;IMAGE_&#8203;MAX_&#8203;BUFFER_&#8203;SIZE</code>.
 For a 1D image and 1D image array, the image width must be a value ≥1
 and ≤ <code>CL_&#8203;DEVICE_&#8203;IMAGE2D_&#8203;MAX_&#8203;WIDTH</code>.</p>
 </li>
 <li>
 <p><code>image_height</code> is 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>CL_&#8203;DEVICE_&#8203;IMAGE2D_&#8203;MAX_&#8203;HEIGHT</code>.
 For a 3D image, the image height must be a value ≥ 1 and ≤
 <code>CL_&#8203;DEVICE_&#8203;IMAGE3D_&#8203;MAX_&#8203;HEIGHT</code>.</p>
 </li>
 <li>
 <p><code>image_depth</code> is 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>CL_&#8203;DEVICE_&#8203;IMAGE3D_&#8203;MAX_&#8203;DEPTH</code>.</p>
 </li>
 <li>
 <p><code>image_array_size</code><sup>5</sup> is 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>image_array_size</code>, if specified, must be a value ≥ 1 and
 ≤ <code>CL_&#8203;DEVICE_&#8203;IMAGE_&#8203;MAX_&#8203;ARRAY_&#8203;SIZE</code>.</p>
 <div class="dlist">
 <dl>
 <dt class="hdlist1">5</dt>
 <dd>
 <p>Note that reading and writing 2D image arrays from a kernel with
 <code>image_array_size</code>=1 may be lower performance than 2D images.</p>
 </dd>
 </dl>
 </div>
 </li>
 <li>
 <p><code>image_row_pitch</code> is the scan-line pitch in bytes.
 This must be 0 if <em>host_ptr</em> is <code>NULL</code> and can be either 0 or ≥
 <code>image_width</code> × size of element in bytes if <em>host_ptr</em> is not <code>NULL</code>.
 If <em>host_ptr</em> is not <code>NULL</code> and <code>image_row_pitch</code> = 0, <code>image_row_pitch</code> is
 calculated as <code>image_width</code> × size of element in bytes.
 If <code>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>CL_&#8203;DEVICE_&#8203;IMAGE_&#8203;PITCH_&#8203;ALIGNMENT</code> value for all devices in the context
 associated with the buffer specified by <code>mem_object</code> that support images.</p>
 </li>
 <li>
 <p><code>image_slice_pitch</code> is 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 <em>host_ptr</em> is <code>NULL</code>.
 If <em>host_ptr</em> is not <code>NULL</code>, <code>image_slice_pitch</code> can be either 0 or ≥
 <code>image_row_pitch</code> × <code>image_height</code> for a 2D image array or 3D image
 and can be either 0 or ≥ <code>image_row_pitch</code> for a 1D image array.
 If <em>host_ptr</em> is not <code>NULL</code> and <code>image_slice_pitch</code> = 0, <code>image_slice_pitch</code>
 is calculated as <code>image_row_pitch</code> × <code>image_height</code> for a 2D image
 array or 3D image and <code>image_row_pitch</code> for a 1D image array.
 If <code>image_slice_pitch</code> is not 0, it must be a multiple of the
 <code>image_row_pitch</code>.</p>
 </li>
 <li>
 <p><code>num_mip_levels</code> and <code>num_samples</code> must be 0.</p>
 </li>
 <li>
 <p><code>mem_object</code> may refer to a valid buffer or image memory object.
 <code>mem_object</code> can be a buffer memory object if <code>image_type</code> is
 <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE1D_&#8203;BUFFER</code> or <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE2D</code><sup>6</sup>.
 <code>mem_object</code> can be an image object if <code>image_type</code> is
 <code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;IMAGE2D</code><sup>7</sup>.
 Otherwise it must be <code>NULL</code>.
 The image pixels are taken from the memory objects data store.
 When the contents of the specified memory objects data store are modified,
 those changes are reflected in the contents of the image object and
 vice-versa at corresponding synchronization points.</p>
 </li>
 </ul>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_description">Description</h2>
 <div class="sectionbody">
 <div class="dlist">
 <dl>
 <dt class="hdlist1">6</dt>
 <dd>
 <p>To create a 2D image from a buffer object that share the data store
 between the image and buffer object.</p>
 </dd>
 <dt class="hdlist1">7</dt>
 <dd>
 <p>To create an image object from another image object that share the data
 store between these image objects.</p>
 </dd>
 </dl>
 </div>
 <div class="paragraph">
 <p>For a 1D image buffer created from a buffer object, the <code>image_width</code> ×
 size of element in bytes must be ≤ size of the buffer object.
 The image data in the buffer object is stored as a single scanline which is
 a linear sequence of adjacent elements.</p>
 </div>
 <div class="paragraph">
 <p>For a 2D image created from a buffer object, the <code>image_row_pitch</code> ×
 <code>image_height</code> must be ≤ size of the buffer object specified by
 <code>mem_object</code>.
 The image data in the buffer object is stored as a linear sequence of
 adjacent scanlines.
 Each scanline is a linear sequence of image elements padded to
 <code>image_row_pitch</code> bytes.</p>
 </div>
 <div class="paragraph">
 <p>For an image object created from another image object, the values specified
 in the image descriptor except for <code>mem_object</code> must match the image
 descriptor information associated with <code>mem_object</code>.</p>
 </div>
 <div class="paragraph">
 <p>Image elements are stored according to their image format as described in
 <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#image-format-descriptor" target="_blank" rel="noopener">Image Format Descriptor</a>.</p>
 </div>
 <div class="paragraph">
 <p>If the buffer object specified by <code>mem_object</code> was created with
 <code>CL_&#8203;MEM_&#8203;USE_&#8203;HOST_&#8203;PTR</code>, the <em>host_ptr</em> specified to <strong>clCreateBuffer</strong> must be
 aligned to the maximum of the <code>CL_&#8203;DEVICE_&#8203;IMAGE_&#8203;BASE_&#8203;ADDRESS_&#8203;ALIGNMENT</code> value
 for all devices in the context associated with the buffer specified by
 <code>mem_object</code> that support images.</p>
 </div>
 <div class="paragraph">
 <p>Creating a 2D image object from another 2D image object allows users to
 create a new image object that shares the image data store with <code>mem_object</code>
 but views the pixels in the image with a different channel order.
 The restrictions are:</p>
 </div>
 <div class="ulist">
 <ul>
 <li>
 <p>all the values specified in <code>image_desc</code> except for <code>mem_object</code> must match
 the image descriptor information associated with <code>mem_object</code>.</p>
 </li>
 <li>
 <p>The <code>image_desc</code> used for creation of <code>mem_object</code> may not be
 equivalent to image descriptor information associated with <code>mem_object</code>.
 To ensure the values in <em>`image_desc</em> will match one can query
 <code>mem_object</code> for associated information using <strong>clGetImageInfo</strong> function
 described in <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#image-object-queries" target="_blank" rel="noopener">Image Object Queries</a>.</p>
 </li>
 <li>
 <p>the channel data type specified in <code>image_format</code> must match the channel
 data type associated with <code>mem_object</code>.
 The channel order values<sup>8</sup> supported are:</p>
 </li>
 </ul>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_see_also">See Also</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p><a href="clCreateImage.html">clCreateImage</a>, <a href="clCreateImageWithProperties.html">clCreateImageWithProperties</a>, <a href="cl_mem_object_type.html">cl_mem_object_type</a>, <a href="cl_uint.html">cl_uint</a></p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_document_notes">Document Notes</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>For more information, see the <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#cl_image_desc" target="_blank" rel="noopener">OpenCL Specification</a></p>
 </div>
 <div class="paragraph">
 <p>This page is extracted from the OpenCL Specification.
 Fixes and changes should be made to the Specification, not directly.</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_copyright">Copyright</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>Copyright (c) 2014-2020 Khronos Group. This work is licensed under a
 <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank" rel="noopener">Creative Commons
 Attribution 4.0 International License</a>.</p>
 </div>
 </div>
 </div>
 </div>
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