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| <title>cl_khr_gl_depth_images</title> |
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| <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_depth_images"></a> |
| <h1>cl_khr_gl_depth_images</h1> |
| <p> |
| Extends CL/GL sharing to allow a CL image to be created from a GL depth or depth-stencil texture. |
| </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"> |
| #pragma OPENCL EXTENSION cl_khr_gl_depth_images : enable |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| The <code class="function">cl_khr_gl_depth_images</code> extension extends |
| CL / GL sharing |
| (i.e. the |
| <a class="citerefentry" href="cl_khr_gl_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_sharing</span></span></a> extension) |
| defined in section 9.7 to allow |
| a CL depth image to be created from a GL |
| depth or depth-stencil texture. |
| If this extension is supported by an implementation, |
| the string cl_khr_gl_depth_images |
| will be present in the |
| <code class="constant">CL_PLATFORM_EXTENSIONS</code> string |
| described in table 4.1 or |
| <code class="constant">CL_DEVICE_EXTENSIONS</code> string |
| described in table 4.3. |
| </p> |
| <p> |
| Depth images with an image |
| channel order of <code class="constant">CL_DEPTH_STENCIL</code> can only be created using the |
| <a class="citerefentry" href="clCreateFromGLTexture.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromGLTexture</span></span></a> API. |
| </p> |
| <p> |
| For the image format given by channel order of |
| <code class="constant">CL_DEPTH_STENCIL</code> and channel data type of |
| <code class="constant">CL_UNORM_INT24</code>, the depth is stored as |
| an unsigned normalized 24-bit value. |
| </p> |
| <p> |
| For the image format given by channel order of |
| <code class="constant">CL DEPTH_STENCIL</code> and channel data type of |
| <code class="constant">CL_FLOAT</code>, each pixel is two |
| 32-bit values. The depth is stored as a single precision floating |
| point value followed by the stencil which is |
| stored as a 8-bit integer value. |
| </p> |
| <p> |
| The stencil value cannot be read or written |
| using the read imagef and write imagef built-in |
| functions in an OpenCL kernel. |
| </p> |
| <p> |
| Depth image objects with an image channel order = |
| <code class="constant">CL_DEPTH_STENCIL</code> 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> |
| |
| The following new image formats are added to table 9.4 in section 9.7.3.1 of the OpenCL 2.1 |
| extension specification. If a GL texture object with an internal format from table 9.4 is |
| successfully created by OpenGL, then there is guaranteed to be a mapping to one of the |
| corresponding CL image format(s) in that table. |
| </p> |
| <div class="informaltable"> |
| <table class="informaltable" border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">GL internal format</th> |
| <th align="left">CL image format |
| (channel order, channel data type)</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="constant">GL_DEPTH_COMPONENT32F</code> |
| </td> |
| <td align="left"> |
| <code class="constant">CL_DEPTH, CL_FLOAT</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">GL_DEPTH_COMPONENT16</code> |
| </td> |
| <td align="left"> |
| <code class="constant">CL_DEPTH, CL_UNORM_INT16</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">GL_DEPTH24_STENCIL8</code> |
| </td> |
| <td align="left"> |
| <code class="constant">CL_DEPTH_STENCIL, CL_UNORM_INT24</code> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">GL_DEPTH32F_STENCIL8</code> |
| </td> |
| <td align="left"> |
| <code class="constant">CL_DEPTH_STENCIL, CL_FLOAT</code> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </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=111" 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 © 2007-2015 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 |
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| in all copies or substantial portions of the Materials. |
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