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| <title>accessQualifiers</title> |
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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="accessQualifiers"></a> |
| <h1>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 class="informaltable" border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td align="left"> |
| __read_only |
| __write_only |
| __read_write |
| read_only |
| write_only |
| read_write |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| Image objects specified as arguments to a |
| kernel can be declared to be read-only, write-only or |
| read-write. 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 object arguments to declare if the image |
| object is being read or written by a kernel or function. The |
| <code class="function">__read_write</code> (or <code class="function">read_write</code>) |
| qualifier must be used with image object arguments |
| of kernels and of user-defined functions to |
| declare if the image object is being both read and |
| written by the kernel. If no qualifier is provided, |
| <code class="function">read_only</code> is assumed. |
| </p> |
| <p> |
| In the following example |
| </p> |
| <div class="informaltable"> |
| <table class="informaltable" border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <div class="literallayout"><p>kernel void<br /> |
| foo (read_only image2d_t imageA, <br /> |
| write_only image2d_t imageB)<br /> |
| {<br /> |
| ...<br /> |
| }<br /> |
| </p></div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| <code class="code">imageA</code> is a read-only 2D image object, and |
| <code class="code">imageB</code> is a write-only 2D image object. |
| </p> |
| <p> |
| The sampler-less read image and write image built-ins |
| can be used with image declared with the |
| <code class="function">__read_write</code> (or <code class="function">read_write</code>) qualifier. |
| Calls to built-ins that read from an image |
| using a sampler for images declared with the |
| <code class="function">__read_write</code> (or <code class="function">read_write</code>) qualifier |
| will be a compilation error. |
| </p> |
| <p> |
| Pipe objects specified as arguments to a kernel |
| also use these access qualifiers. Refer to |
| section 6.13.16 for a detailed description on |
| how these access qualifiers can be used with pipes. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| The <code class="function">__read_only</code>, <code class="function">__write_only</code>, |
| <code class="function">__read_write</code>, <code class="function">read_only</code>, |
| <code class="function">write_only</code> and <code class="function">read_write</code> names are reserved |
| for use as access qualifiers and shall not be used otherwise. |
| </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-openclc.pdf#page=46" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="qualifiers.html"><span class="citerefentry"><span class="refentrytitle">qualifiers</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. |
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