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| <title>cl_khr_gl_msaa_sharing</title> |
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| <div class="refentry"> |
| <a id="id-1"></a> |
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| <div xmlns="" class="refnamediv"> |
| <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> |
| <div class="informaltable"> |
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| <colgroup> |
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| <tbody> |
| <tr> |
| <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> |
| <div class="informaltable"> |
| <table border="1"> |
| <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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