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    <title>cl_khr_gl_msaa_sharing</title>
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        <a xmlns="http://www.w3.org/1999/xhtml" id="cl_khr_gl_msaa_sharing"></a>
        <h1>cl_khr_gl_msaa_sharing</h1>
        <p>
            Extends the CL/GL sharing to support GL multi-sampled texture (color or depth).
        </p>
      </div>
      <div class="refsect2">
        <a id="synopsis"></a>
        <h3>
        </h3>
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                <td align="left">
#pragma OPENCL EXTENSION cl_khr_gl_msaa_sharing : enable
                        </td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
          This extension name is <code class="function">cl_khr_gl_msaa_sharing</code>. This extension requires 
          <a class="citerefentry" href="cl_khr_gl_depth_images.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_depth_images</span></span></a>.
        </p>
        <p>
This extension adds read_image and write_image functions to the 
<a class="citerefentry" href="imageFunctions.html"><span class="citerefentry"><span class="refentrytitle">Image Read and Write Functions</span></span></a>.
        </p>
        <p>
            Multi-sample CL image objects (MSAA) can only be read 
            from a kernel. Multi-sample CL image objects 
            cannot be used as arguments to 
            <a class="citerefentry" href="clEnqueueReadImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadImage</span></span></a> , 
            <a class="citerefentry" href="clEnqueueWriteImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteImage</span></span></a>,
            <a class="citerefentry" href="clEnqueueCopyImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyImage</span></span></a>, 
            <a class="citerefentry" href="clEnqueueCopyImageToBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyImageToBuffer</span></span></a>, 
            <a class="citerefentry" href="clEnqueueCopyBufferToImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBufferToImage</span></span></a>, 
            <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> and 
            <a class="citerefentry" href="clEnqueueFillImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueFillImage</span></span></a> and will return a 
            <span class="errorname">CL_INVALID_OPERATION</span> error.
        </p>
        <p>
            Add the following new data types to table 6.3 in section 6.1.3 of the OpenCL 2.1 specification
            (see <a class="citerefentry" href="otherDataTypes.html"><span class="citerefentry"><span class="refentrytitle">otherDataTypes</span></span></a>):
        </p>
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            <colgroup>
              <col align="left" class="col1" />
              <col align="left" class="col2" />
            </colgroup>
            <thead>
              <tr>
                <th align="left">Type</th>
                <th align="left">Description</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left">
                  <span class="type">image2d_msaa_t</span>
                </td>
                <td align="left">A 2D multi-sample color image. Refer to section 
                        6.13.14 for a detailed description of the built-in 
                        functions that use this type.</td>
              </tr>
              <tr>
                <td align="left">
                  <span class="type">image2d_array_msaa_t</span>
                </td>
                <td align="left">A 2D multi-sample color image array. Refer to 
                        section 6.13.14 for a detailed description of the 
                        built-in functions that use this type.</td>
              </tr>
              <tr>
                <td align="left">
                  <span class="type">image2d_msaa_depth_t</span>
                </td>
                <td align="left">A 2D multi-sample depth image. Refer to section 
                        6.13.14 for a detailed description of the built-in 
                        functions that use this type.</td>
              </tr>
              <tr>
                <td align="left">
                  <span class="type">image2d_array_msaa_depth_t</span>
                </td>
                <td align="left">A 2D multi-sample depth image array. Refer to 
                        section 6.13.14 for a detailed description of the 
                        built-in functions that use this type.</td>
              </tr>
            </tbody>
          </table>
        </div>
        <p>
            NOTE: When a multisample image is accessed in a 
            kernel, the access takes one vector of 
            integers describing which pixel to fetch and 
            an integer corresponding to the sample numbers 
            describing which sample within the pixel to 
            fetch. sample identifies the sample position in the 
            multi-sample image.
        </p>
        <p>
            For best performance, we recommend that 
            <code class="varname">sample</code> be a literal value so it is known at 
            compile time and the OpenCL compiler can 
            perform appropriate optimizations for multisample reads on the device.
        </p>
        <p>
            No standard sampling instructions are allowed on 
            the multisample image. Accessing a coordinate 
            outside the image and/or a sample that is outside 
            the number of samples associated with each 
            pixel in the image 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-extensions.pdf#page=113" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1"><a id="seealso"></a><h2>Also see</h2><a class="citerefentry" href="imageFunctions.html"><span class="citerefentry"><span class="refentrytitle">Image Read and Write Functions</span></span></a>,
        <a class="citerefentry" href="clGetGLTextureInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetGLTextureInfo</span></span></a></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" />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.
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