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| <title>imageAccessQualifiers</title> |
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| <body> |
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| <div class="titlepage"></div> |
| <div xmlns="" class="refnamediv"> |
| <a xmlns="http://www.w3.org/1999/xhtml" id="imageAccessQualifiers"></a> |
| <h1>Image Access Qualifiers</h1> |
| <p> |
| Access Qualifiers for image memory objects. |
| </p> |
| </div> |
| <div class="refsect2"> |
| <a id="synopsis"></a> |
| <h3> |
| </h3> |
| <div class="informaltable"> |
| <table border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
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| <tbody> |
| <tr> |
| <td align="left"> |
| __read_only |
| __write_only |
| read_only |
| write_only |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| Image memory objects specified as arguments to a kernel can be declared to be read-only or |
| write-only. A kernel cannot read from and write to the same image memory object. The |
| <code class="function">__read_only</code> (or <code class="function">read_only</code>) and |
| <code class="function">__write_only</code> (or <code class="function">write_only</code>) qualifiers |
| must be used with image memory object arguments to declare if the image memory object is |
| being read or written by a kernel. The default qualifier is <code class="function">__read_only</code>. |
| </p> |
| </div> |
| <div class="refsect2"> |
| <a id="example1"></a> |
| <h3> |
| Example |
| </h3> |
| <p> |
| In the example below, <code class="constant">imageA</code> is a read-only image memory object and |
| <code class="constant">imageB</code> is a write-only image memory object. |
| </p> |
| <div class="informaltable"> |
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| <colgroup> |
| <col align="left" class="col1" /> |
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| <tbody> |
| <tr> |
| <td align="left"> |
| __kernel void |
| foo (read_only image2d_t imageA, |
| write_only image2d_t imageB) |
| { |
| ... |
| } |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="specification"></a> |
| <h2>Specification</h2> |
| <p> |
| <img src="pdficon_small1.gif" /> |
| |
| <a href="http://www.khronos.org/registry/cl/specs/opencl-1.x-latest.pdf#page=153" target="OpenCL Spec">OpenCL Specification</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 © 2007-2009 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 |
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| 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. |
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