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| <title>EXTENSION</title> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /> |
| <meta name="keywords" content="EXTENSION" /> |
| </head> |
| <body> |
| <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="EXTENSION"></a> |
| <h1>EXTENSION</h1> |
| <p> |
| A #pragma directive to set the behavior for OpenCL extensions. |
| </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 <code class="varname">extension_name</code> : <code class="varname">behavior</code> |
| #pragma OPENCL EXTENSION all : <code class="varname">behavior</code> |
| </td> |
| </tr> |
| </tbody> |
| </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"> |
| extension_name |
| </code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| The name of the extension. The <code class="varname">extension_name</code> will have names of |
| the form <code class="function">cl_khr_</code><<code class="varname">name</code>> for an extension |
| approved by the OpenCL working group and will have names of the form |
| <code class="function">cl_</code><<code class="varname">vendor_name</code>>_<<code class="varname">name</code>> |
| for vendor extensions. The token <code class="function">all</code> means that the behavior applies |
| to all extensions supported by the compiler. The table below shows the legal values for |
| <code class="varname">extension_name</code>: |
| </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">Extension name</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_3d_image_writes.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_3d_image_writes</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Writes to 3D image objects</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_byte_addressable_store.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_byte_addressable_store</span> |
| </span> |
| </a> |
| </td> |
| <td align="left"> </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_context_abort.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_context_abort</span> |
| </span> |
| </a> |
| </td> |
| <td align="left"> </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_d3d10_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_d3d10_sharing</span></span></a></td> |
| <td align="left">Sharing memory objects wth Direct3D 10</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_d3d11_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_d3d11_sharing</span></span></a></td> |
| <td align="left">Sharing memory objects wth Direct3D 11</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_depth_images.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_depth_images</span> |
| </span> |
| </a> |
| </td> |
| <td align="left"> </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_device_enqueue_local_arg_types.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_device_enqueue_local_arg_types</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Standard Portable Intermediate Representation (SPIR) support</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_dx9_media_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_dx9_media_sharing</span></span></a></td> |
| <td align="left">Sharing memory objects wth Direct3D 9</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_egl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_event</span></span></a></td> |
| <td align="left">Create OpenCL event objects linked to EGL fence sync objects</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_egl_image.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_image</span></span></a></td> |
| <td align="left">Create derived resources from EGLImages</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_fp16.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_fp16</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Half-precision floating-point</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_fp64.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_fp64</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Dobule-precision floating-point</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_gl_depth_images.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_gl_depth_images</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">GL depth or depth-stencil compatibility</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_gl_event.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_gl_event</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">CL event objects from GL sync objects</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_gl_msaa_sharing.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_gl_msaa_sharing</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">GL multi-sampled (MSAA) compatibility</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_gl_sharing.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_gl_sharing</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">OpenGL sharing</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_global_int32_base_atomics.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_global_int32_base_atomics</span> |
| </span> |
| </a> |
| </td> |
| <td align="left"> </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_global_int32_extended_atomics.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_global_int32_extended_atomics</span> |
| </span> |
| </a> |
| </td> |
| <td align="left"> </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_icd.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_icd</span></span></a></td> |
| <td align="left">Access Khronos OpenCL installable client driver loader (ICD Loader</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_il_program.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_il_program</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Standard Portable Intermediate Representation (SPIR) support</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_image2d_from_buffer.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_image2d_from_buffer</span> |
| </span> |
| </a> |
| </td> |
| <td align="left"> </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_initialize_memory.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_initialize_memory</span></span></a></td> |
| <td align="left">Initialize local or private memory</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_int64_base_atomics.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_int64_base_atomics</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">64-bit integer base atomic operations</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_int64_extended_atomics.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_int64_extended_atomics</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">64-bit integer extended atomic operations</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_local_int32_base_atomics.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_local_int32_base_atomics</span> |
| </span> |
| </a> |
| </td> |
| <td align="left"> </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_local_int32_extended_atomics.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_local_int32_extended_atomics</span> |
| </span> |
| </a> |
| </td> |
| <td align="left"> </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_mipmap_image.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_mipmap_image</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Standard Portable Intermediate Representation (SPIR) support</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_mipmap_image.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_mipmap_image_writes</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Standard Portable Intermediate Representation (SPIR) support</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_priority_hints.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_priority_hints</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Standard Portable Intermediate Representation (SPIR) support</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_spir.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_spir</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Standard Portable Intermediate Representation (SPIR) support</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_srgb_image_writes.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_srgb_image_writes</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">For writing to sRGB images</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_subgroups.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_subgroups</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Implementation-controlled subgroups</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_terminate_context.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_terminate_context</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Termiate an OpenCL context on a device</td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <a class="citerefentry" href="cl_khr_throttle_hints.html"> |
| <span class="citerefentry"> |
| <span class="refentrytitle">cl_khr_throttle_hints</span> |
| </span> |
| </a> |
| </td> |
| <td align="left">Standard Portable Intermediate Representation (SPIR) support</td> |
| </tr> |
| <tr> |
| <td align="left">cles_khr_int64</td> |
| <td align="left"> </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname"> |
| behavior |
| </code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| One of the following values: |
| </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">behavior</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left">enable</td> |
| <td align="left"> |
| Behave as specified by the extension <code class="varname">extension_name</code>. |
| Report an error on the <code class="function">#pragma OPENCL EXTENSION</code> |
| if the <code class="varname">extension_name</code> is not supported, or if |
| <code class="function">all</code> is specified. |
| </td> |
| </tr> |
| <tr> |
| <td align="left">disable</td> |
| <td align="left"> |
| Behave (including issuing errors and warnings) as if the extension |
| <code class="varname">extension_name</code> is not part of the language definition. |
| If <code class="function">all</code> is specified, then behavior must revert |
| back to that of the non-extended core version of the language |
| being compiled to. Warn on the <code class="function">#pragma OPENCL EXTENSION</code> |
| if the extension <code class="varname">extension_name</code> is not supported. |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| The <code class="function">#pragma OPENCL EXTENSION</code> directive is a simple, low-level |
| mechanism to set the behavior for each extension. It does not define policies such |
| as which combinations are appropriate; those must be defined elsewhere. The order of |
| directives matter in setting the behavior for each extension. Directives that occur |
| later override those seen earlier. The <code class="function">all</code> variant sets the |
| behavior for all extensions, overriding all previously issued extension directives, |
| but only if the <code class="varname">behavior</code> is set to <code class="function">disable</code>. |
| </p> |
| <p> |
| The initial state of the compiler is as if the directive <code class="function">#pragma OPENCL |
| EXTENSION all : disable</code> was issued, telling the compiler that all error and |
| warning reporting must be done according to this specification, ignoring any extensions. |
| </p> |
| <p> |
| Every extension which affects the OpenCL language semantics, syntax or adds built-in |
| functions to the language must create a preprocessor <code class="code">#define</code> that |
| matches the extension name string. This <code class="code">#define</code> would be available in |
| the language if and only if the extension is supported on a given implementation. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| This document describes the list of optional features supported by OpenCL 2.1. |
| Optional extensions may be supported by some OpenCL devices. Optional extensions are |
| not required to be supported by a conformant OpenCL implementation, but are expected |
| to be widely available; they define functionality that is likely to move into the |
| required feature set in a future revision of the OpenCL specification |
| </p> |
| <p> |
| OpenCL extensions approved by the OpenCL working group can be promoted to required core |
| features in later revisions of OpenCL. When this occurs, the extension specifications |
| are merged into the core specification. Functions and enumerants that are part of |
| such promoted extensions will have the <code class="code">KHR</code> affix removed. OpenCL implementations of |
| such later revisions must also export the name strings of promoted extensions in the |
| <code class="constant">CL_PLATFORM_EXTENSIONS</code> or <code class="constant">CL_DEVICE_EXTENSIONS</code> |
| string, and support the KHR-affixed versions of functions and enumerants as a |
| transition aid. |
| </p> |
| </div> |
| <div class="refsect2"> |
| <a id="example1"></a> |
| <h3> |
| Example |
| </h3> |
| <p> |
| An extension which adds the extension string "cl_khr_3d_image_writes" should also add a |
| preprocessor <code class="code">#define</code> called <code class="constant">cl_khr_3d_image_writes</code>. A |
| kernel can now use this preprocessor <code class="code">#define</code> to do something like the |
| following: |
| </p> |
| <div class="informaltable"> |
| <table class="informaltable" border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td align="left"> |
| #ifdef cl_khr_3d_image_writes |
| // do something using the extension |
| #else |
| // do something else or #error! |
| #endif |
| </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=7" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clGetExtensionFunctionAddressForPlatform.html"><span class="citerefentry"><span class="refentrytitle">clGetExtensionFunctionAddressForPlatform</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. |
| 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. |
| </div> |
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