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| <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN" |
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| |
| <refentry> |
| <refentryinfo> |
| <keywordset> |
| <keyword>EXTENSION</keyword> |
| </keywordset> |
| </refentryinfo> |
| |
| <refmeta> |
| <refentrytitle>EXTENSION</refentrytitle> |
| |
| <refmiscinfo> |
| <copyright> |
| <year>2007-2013</year> |
| <holder>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.</holder> |
| </copyright> |
| </refmiscinfo> |
| <manvolnum>3</manvolnum> |
| </refmeta> |
| |
| <!-- ================================ SYNOPSIS --> |
| |
| <refnamediv id="EXTENSION"> |
| <refname>EXTENSION</refname> |
| |
| <refpurpose> |
| A #pragma directive to set the behavior for OpenCL extensions. |
| </refpurpose> |
| </refnamediv> |
| |
| <!-- ALTERNATIVE SYNTAX SYNOPSIS (NON-FUNCTION) --> |
| |
| <refsect2 id="synopsis"> |
| <title> |
| </title> |
| |
| <informaltable frame="none"> |
| <tgroup cols="1" align="left" colsep="0" rowsep="0"> |
| <colspec colname="col1" colnum="1" /> |
| <tbody> |
| <row> |
| <entry> |
| #pragma OPENCL EXTENSION <varname>extension_name</varname> : <varname>behavior</varname> |
| #pragma OPENCL EXTENSION all : <varname>behavior</varname> |
| </entry> |
| </row> |
| </tbody> |
| </tgroup> |
| </informaltable> |
| </refsect2> |
| |
| <!-- ================================ PARAMETERS --> |
| |
| <refsect1 id="parameters"> |
| <title>Parameters</title> |
| <variablelist> |
| |
| <varlistentry> |
| <term> |
| <varname> <!-- parameter name --> |
| extension_name |
| </varname> |
| </term> |
| |
| <listitem> |
| <para> <!-- parameter description --> |
| The name of the extension. The <varname>extension_name</varname> will have names of |
| the form <function>cl_khr_</function><<varname>name</varname>> for an extension |
| approved by the OpenCL working group and will have names of the form |
| <function>cl_</function><<varname>vendor_name</varname>>_<<varname>name</varname>> |
| for vendor extensions. The token <function>all</function> means that the behavior applies |
| to all extensions supported by the compiler. The table below shows the legal values for |
| <varname>extension_name</varname>: |
| </para> |
| |
| <informaltable frame="all"> |
| <tgroup cols="2" align="left" colsep="1" rowsep="1"> |
| <colspec colname="col1" colnum="1" /> |
| <colspec colname="col2" colnum="2" /> |
| |
| <thead> |
| <row> |
| <entry>Extension name</entry> |
| <entry>Description</entry> |
| </row> |
| </thead> |
| |
| <tbody> |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_3d_image_writes</refentrytitle></citerefentry></entry> |
| <entry>Writes to 3D image objects</entry> |
| </row> |
| |
| <row> |
| <entry> |
| <citerefentry><refentrytitle>cl_khr_d3d10_sharing</refentrytitle></citerefentry></entry> |
| <entry>Sharing memory objects wth Direct3D 10</entry> |
| </row> |
| |
| <row> |
| <entry> |
| <citerefentry><refentrytitle>cl_khr_d3d11_sharing</refentrytitle></citerefentry></entry> |
| <entry>Sharing memory objects wth Direct3D 11</entry> |
| </row> |
| |
| <row> |
| <entry> |
| <citerefentry><refentrytitle>cl_khr_dx9_media_sharing</refentrytitle></citerefentry></entry> |
| <entry>Sharing memory objects wth Direct3D 9</entry> |
| </row> |
| |
| <row> |
| <entry> |
| <citerefentry><refentrytitle>cl_khr_egl_event</refentrytitle></citerefentry></entry> |
| <entry>Create OpenCL event objects linked to EGL fence sync objects</entry> |
| </row> |
| |
| <row> |
| <entry> |
| <citerefentry><refentrytitle>cl_khr_egl_image</refentrytitle></citerefentry></entry> |
| <entry>Create derived resources from EGLImages</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_fp16</refentrytitle></citerefentry></entry> |
| <entry>Half-precision floating-point</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_fp64</refentrytitle></citerefentry></entry> |
| <entry>Dobule-precision floating-point</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_gl_depth_images</refentrytitle></citerefentry></entry> |
| <entry>GL depth or depth-stencil compatibility</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_gl_event</refentrytitle></citerefentry></entry> |
| <entry>CL event objects from GL sync objects</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_gl_msaa_sharing</refentrytitle></citerefentry></entry> |
| <entry>GL multi-sampled (MSAA) compatibility</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry></entry> |
| <entry>OpenGL sharing</entry> |
| </row> |
| |
| <row> |
| <entry> |
| <citerefentry><refentrytitle>cl_khr_icd</refentrytitle></citerefentry></entry> |
| <entry>Access Khronos OpenCL installable client driver loader (ICD Loader</entry> |
| </row> |
| |
| <row> |
| <entry> |
| <citerefentry><refentrytitle>cl_khr_initialize_memory</refentrytitle></citerefentry></entry> |
| <entry>Initialize local or private memory</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_int64_base_atomics</refentrytitle></citerefentry></entry> |
| <entry>64-bit integer base atomic operations</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_int64_extended_atomics</refentrytitle></citerefentry></entry> |
| <entry>64-bit integer extended atomic operations</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_spir</refentrytitle></citerefentry></entry> |
| <entry>Standard Portable Intermediate Representation (SPIR) support</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_srgb_image_writes</refentrytitle></citerefentry></entry> |
| <entry>For writing to sRGB images</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_subgroups</refentrytitle></citerefentry></entry> |
| <entry>Implementation-controlled subgroups</entry> |
| </row> |
| |
| <row> |
| <entry><citerefentry><refentrytitle>cl_khr_terminate_context</refentrytitle></citerefentry></entry> |
| <entry>Termiate an OpenCL context on a device</entry> |
| </row> |
| |
| <row> |
| <entry>cl_apple_gl_sharing</entry> |
| <entry>MacOS X OpenGL sharing</entry> |
| </row> |
| |
| </tbody> |
| </tgroup> |
| </informaltable> |
| </listitem> |
| </varlistentry> |
| |
| <varlistentry> |
| <term> |
| <varname> <!-- parameter name --> |
| behavior |
| </varname> |
| </term> |
| |
| <listitem> |
| <para> <!-- parameter description --> |
| One of the following values: |
| </para> |
| |
| <informaltable frame="all"> |
| <tgroup cols="2" align="left" colsep="1" rowsep="1"> |
| <colspec colname="col1" colnum="1" /> |
| <colspec colname="col2" colnum="2" /> |
| |
| <thead> |
| <row> |
| <entry>behavior</entry> |
| <entry>Description</entry> |
| </row> |
| </thead> |
| |
| <tbody> |
| <row> |
| <entry>enable</entry> |
| <entry> |
| Behave as specified by the extension <varname>extension_name</varname>. |
| Report an error on the <function>#pragma OPENCL EXTENSION</function> |
| if the <varname>extension_name</varname> is not supported, or if |
| <function>all</function> is specified. |
| </entry> |
| </row> |
| |
| <row> |
| <entry>disable</entry> |
| <entry> |
| Behave (including issuing errors and warnings) as if the extension |
| <varname>extension_name</varname> is not part of the language definition. |
| If <function>all</function> is specified, then behavior must revert |
| back to that of the non-extended core version of the language |
| being compiled to. Warn on the <function>#pragma OPENCL EXTENSION</function> |
| if the extension <varname>extension_name</varname> is not supported. |
| </entry> |
| </row> |
| </tbody> |
| </tgroup> |
| </informaltable> |
| </listitem> |
| </varlistentry> |
| |
| <!-- END PARAMETER TABLE --> |
| |
| </variablelist> |
| </refsect1> |
| |
| <!-- ================================ DESCRIPTION --> |
| |
| <refsect1 id="description"><title>Description</title> |
| <para> |
| The <function>#pragma OPENCL EXTENSION</function> 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 <function>all</function> variant sets the |
| behavior for all extensions, overriding all previously issued extension directives, |
| but only if the <varname>behavior</varname> is set to <function>disable</function>. |
| </para> |
| |
| <para> |
| The initial state of the compiler is as if the directive <function>#pragma OPENCL |
| EXTENSION all : disable</function> was issued, telling the compiler that all error and |
| warning reporting must be done according to this specification, ignoring any extensions. |
| </para> |
| |
| <para> |
| Every extension which affects the OpenCL language semantics, syntax or adds built-in |
| functions to the language must create a preprocessor <code>#define</code> that |
| matches the extension name string. This <code>#define</code> would be available in |
| the language if and only if the extension is supported on a given implementation. |
| </para> |
| </refsect1> |
| |
| <!-- ================================ NOTES --> |
| |
| <refsect1 id="notes"><title>Notes</title> |
| <para> |
| This document describes the list of optional features supported by OpenCL 2.0. |
| 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 |
| </para> |
| |
| <para> |
| 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>KHR</code> affix removed. OpenCL implementations of |
| such later revisions must also export the name strings of promoted extensions in the |
| <constant>CL_PLATFORM_EXTENSIONS</constant> or <constant>CL_DEVICE_EXTENSIONS</constant> |
| string, and support the KHR-affixed versions of functions and enumerants as a |
| transition aid. |
| </para> |
| </refsect1> |
| |
| <!-- ================================ EXAMPLE --> |
| |
| <refsect2 id="example1"> |
| <title> |
| Example |
| </title> |
| |
| <para> |
| An extension which adds the extension string "cl_khr_3d_image_writes" should also add a |
| preprocessor <code>#define</code> called <constant>cl_khr_3d_image_writes</constant>. A |
| kernel can now use this preprocessor <code>#define</code> to do something like the |
| following: |
| </para> |
| |
| <informaltable frame="none"> |
| <tgroup cols="1" align="left" colsep="0" rowsep="0"> |
| <colspec colname="col1" colnum="1" /> |
| <tbody> |
| <row> |
| <entry> |
| #ifdef cl_khr_3d_image_writes |
| // do something using the extension |
| #else |
| // do something else or #error! |
| #endif |
| </entry> |
| </row> |
| </tbody> |
| </tgroup> |
| </informaltable> |
| </refsect2> |
| |
| <!-- ================================ SPECIFICATION --> |
| <!-- Set the "uri" attribute in the <olink /> element to the "named destination" for the PDF page |
| --> |
| <refsect1 id="specification"><title>Specification</title> |
| <para> |
| <imageobject> |
| <imagedata fileref="pdficon_small1.gif" format="gif" /> |
| </imageobject> |
| |
| <olink uri="EXTENSION">OpenCL Specification</olink> |
| </para> |
| </refsect1> |
| |
| <!-- ================================ ALSO SEE --> |
| |
| <refsect1 id="seealso"><title>Also see</title> |
| <para> |
| <citerefentry><refentrytitle>clGetExtensionFunctionAddressForPlatform</refentrytitle></citerefentry> |
| </para> |
| </refsect1> |
| |
| |
| <!-- ============================== COPYRIGHT --> |
| <!-- Content included from copyright.inc.xsl --> |
| |
| <refsect3 id="Copyright"><title></title> |
| <imageobject> |
| <imagedata fileref="KhronosLogo.jpg" format="jpg" /> |
| </imageobject> |
| <para /> |
| </refsect3> |
| |
| <!-- 20-Dec-2013, rev. 19 --> |
| </refentry> |
| |
