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| <title>clCreateSampler</title> |
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| <a id="id-1"></a> |
| <div class="titlepage"></div> |
| <div xmlns="" class="refnamediv"> |
| <a xmlns="http://www.w3.org/1999/xhtml" id="clCreateSampler"></a> |
| <h1> |
| clCreateSampler |
| </h1> |
| <p> |
| Creates a sampler object. |
| </p> |
| </div> |
| <div class="refsynopsisdiv"> |
| <h2></h2> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
| <tr valign="bottom"> |
| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="abstractDataTypes.html" target="pagedisplay">cl_sampler</a> <strong class="fsfunc">clCreateSampler</strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_context</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">context</var>, </td> |
| </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_bool" target="pagedisplay">cl_bool</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">normalized_coords</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_addressing_mode" target="pagedisplay">cl_addressing_mode</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">addressing_mode</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_filter_mode" target="pagedisplay">cl_filter_mode</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">filter_mode</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*errcode_ret</var><code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="parameters"></a> |
| <h2>Parameters</h2> |
| <div class="variablelist"> |
| <dl class="variablelist"> |
| <dt> |
| <span class="term"> <code class="varname"> context </code> </span> |
| </dt> |
| <dd> |
| <p> |
| Must be a valid OpenCL context. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> normalized_coords </code> </span> |
| </dt> |
| <dd> |
| <p> |
| Determines if the image coordinates specified are normalized (if |
| <code class="varname">normalized_coords</code> is <code class="constant">CL_TRUE</code>) or |
| not (if <code class="varname">normalized_coords</code> is <code class="constant">CL_FALSE</code>). |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> addressing_mode </code> </span> |
| </dt> |
| <dd> |
| <p> |
| Specifies how out-of-range image coordinates are handled when reading from |
| an image. This can be set to <code class="constant">CL_ADDRESS_MIRRORED_REPEAT</code>, |
| <code class="constant">CL_ADDRESS_REPEAT</code>, <code class="constant">CL_ADDRESS_CLAMP_TO_EDGE</code>, |
| <code class="constant">CL_ADDRESS_CLAMP</code>, and <code class="constant">CL_ADDRESS_NONE</code>. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> filter_mode </code> </span> |
| </dt> |
| <dd> |
| <p> |
| Specifies the type of filter that must be applied when reading an image. This can be |
| <code class="constant">CL_FILTER_NEAREST</code> or <code class="constant">CL_FILTER_LINEAR</code>. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> errcode_ret </code> </span> |
| </dt> |
| <dd> |
| <p> |
| Returns an appropriate error code. If |
| <code class="varname">errcode_ret</code> is NULL, no error code is returned. |
| </p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| A sampler object describes how to sample an image when the |
| image is read in the kernel. The built-in functions to read from an image in a kernel |
| take a sampler as an argument. The sampler arguments to the image read function can |
| be sampler objects created using OpenCL functions and passed as argument values to |
| the kernel or can be samplers declared inside a kernel. In this section we discuss |
| how sampler objects are created using OpenCL functions. |
| </p> |
| <p> |
| For more information about working with samplers, see |
| <a class="citerefentry" href="sampler_t.html"><span class="citerefentry"><span class="refentrytitle">sampler_t</span></span></a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="errors"></a> |
| <h2>Errors</h2> |
| <p> |
| Returns a valid non-zero sampler object and <code class="varname">errcode_ret</code> is set to |
| <span class="errorname">CL_SUCCESS</span> if the sampler object is created successfully. |
| Otherwise, it returns a NULL value with one of the following error values returned in |
| <code class="varname">errcode_ret</code>: |
| </p> |
| <div class="itemizedlist"> |
| <ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if <code class="varname">context</code> |
| is not a valid context. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">addressing_mode</code>, |
| <code class="varname">filter_mode</code>, or <code class="varname">normalized_coords</code> or a |
| combination of these argument values are not valid. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if images are not |
| supported by any device associated with <code class="varname">context</code> |
| (i.e. <span class="errorname">CL_DEVICE_IMAGE_SUPPORT</span> |
| specified in the table of OpenCL Device Queries for |
| <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a> |
| is <span class="errorname">CL_FALSE</span>). |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to allocate |
| resources required by the OpenCL implementation on the device. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate |
| resources required by the OpenCL implementation on the host. |
| </li> |
| </ul> |
| </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-1.2.pdf#page=128" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clRetainSampler.html"><span class="citerefentry"><span class="refentrytitle">clRetainSampler</span></span></a>, |
| <a class="citerefentry" href="clReleaseSampler.html"><span class="citerefentry"><span class="refentrytitle">clReleaseSampler</span></span></a>, |
| <a class="citerefentry" href="clGetSamplerInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetSamplerInfo</span></span></a>, |
| <a class="citerefentry" href="classDiagram.html"><span class="citerefentry"><span class="refentrytitle">Cardinality Diagram</span></span></a> |
| <a class="citerefentry" href="sampler_t.html"><span class="citerefentry"><span class="refentrytitle">sampler_t</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 © 2007-2011 The Khronos Group Inc. |
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