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| <title>clCreateFromGLBuffer</title> | |
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| </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="clCreateFromGLBuffer"></a> | |
| <h1>clCreateFromGLBuffer</h1> | |
| <p> | |
| Creates an OpenCL buffer object from an OpenGL buffer object. | |
| </p> | |
| </div> | |
| <div class="refsynopsisdiv"> | |
| <h2></h2> | |
| <div class="funcsynopsis"> | |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> | |
| <tr valign="bottom"> | |
| <td> | |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"><a class="link" href="abstractDataTypes.html" target="pagedisplay">cl_mem</a> | |
| <strong class="fsfunc"> | |
| clCreateFromGLBuffer | |
| </strong> | |
| (</code> | |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_context</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">context</var>, </td> | |
| </td> | |
| </tr> | |
| <tr valign="top"> | |
| <td> </td> | |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_mem_flags" target="pagedisplay">cl_mem_flags</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</var>, </td> | |
| </tr> | |
| <tr valign="top"> | |
| <td> </td> | |
| <td>GLuint <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">bufobj</var>, </td> | |
| </tr> | |
| <tr valign="top"> | |
| <td> </td> | |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">* errcode_ret</var><code>)</code></td> | |
| </tr> | |
| </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"> context </code> </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| A valid OpenCL context created from an OpenGL context. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> <code class="varname"> flags </code> </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| A bit-field that is | |
| used to specify usage information. Refer to the table for | |
| <a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a> | |
| for a description of <code class="varname">flags</code>. Only | |
| <code class="constant">CL_MEM_READ_ONLY</code>, <code class="constant">CL_MEM_WRITE_ONLY</code> | |
| and <code class="constant">CL_MEM_READ_WRITE</code> values specified in the table at | |
| <a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a> | |
| can be used. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> <code class="varname"> bufobj </code> </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| The name of a GL buffer object. The data | |
| store of the GL buffer object must have have been previously created by | |
| calling OpenGL function <code class="function">glBufferData</code>, although its | |
| contents need not be initialized. The size of the data store will be used | |
| to determine the size of the CL buffer object. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> <code class="varname"> errcode_ret </code> </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| Returns an appropriate error code as described | |
| below. If <code class="varname">errcode_ret</code> is NULL, no error code is returned. | |
| </p> | |
| </dd> | |
| </dl> | |
| </div> | |
| </div> | |
| <div class="refsect1"> | |
| <a id="description"></a> | |
| <h2>Description</h2> | |
| <p> | |
| The size of the GL buffer object data store at the time | |
| <code class="function">clCreateFromGLBuffer</code> is called will be used as the size of buffer | |
| object returned by <code class="function">clCreateFromGLBuffer</code>. If the state of a GL | |
| buffer object is modified through the GL API (e.g. <code class="function">glBufferData</code>) | |
| while there exists a corresponding CL buffer object, subsequent use of the CL buffer | |
| object will result in undefined behavior. | |
| </p> | |
| <p> | |
| The <a class="citerefentry" href="clRetainMemObject.html"><span class="citerefentry"><span class="refentrytitle">clRetainMemObject</span></span></a> | |
| and <a class="citerefentry" href="clReleaseMemObject.html"><span class="citerefentry"><span class="refentrytitle">clReleaseMemObject</span></span></a> | |
| functions can be used to retain and release the buffer object. | |
| </p> | |
| <p> | |
| The CL buffer object created using <code class="function">clCreateFromGLBuffer</code> can also | |
| be used to create a CL 1D image buffer object. | |
| </p> | |
| </div> | |
| <div class="refsect1"> | |
| <a id="notes"></a> | |
| <h2>Notes</h2> | |
| <p> | |
| General information about GL sharing follows. | |
| </p> | |
| <p> | |
| The OpenCL specification in section 9.7 defines how to | |
| share data with texture and buffer objects in a parallel OpenGL implementation, | |
| but does not define how the association between an OpenCL context and an OpenGL | |
| context or share group is established. This extension defines optional attributes | |
| to OpenCL context creation routines which associate a GL context or share group | |
| object with a newly created OpenCL context. If this extension is supported | |
| by an implementation, the string "cl_khr_gl_sharing" will be present in the | |
| <code class="constant">CL_DEVICE_EXTENSIONS</code> | |
| string described in the table of allowed values for <code class="varname">param_name</code> | |
| for <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a> | |
| or in the <code class="constant">CL_PLATFORM_EXTENSIONS</code> | |
| string described in the table of allowed values for <code class="varname">param_name</code> | |
| for <a class="citerefentry" href="clGetPlatformInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformInfo</span></span></a>. | |
| </p> | |
| <p> | |
| This section discusses OpenCL functions that allow applications | |
| to use OpenGL buffer, texture, and renderbuffer objects as OpenCL memory objects. This | |
| allows efficient sharing of data between OpenCL and OpenGL. The OpenCL API may be used | |
| to execute kernels that read and/or write memory objects that are also OpenGL objects. | |
| </p> | |
| <p> | |
| An OpenCL image object may be created from an OpenGL texture or | |
| renderbuffer object. An OpenCL buffer object may be created from an OpenGL buffer object. | |
| </p> | |
| <p> | |
| Any supported OpenGL object defined within the GL share | |
| group object, or the share group associated with the GL context from which the CL | |
| context is created, may be shared, with the exception of the default OpenGL objects | |
| (i.e. objects named zero), which may not be shared. | |
| </p> | |
| <h4><a id="id-1.7.7"></a>OpenGL and Corresponding OpenCL Image Formats</h4> | |
| <p> | |
| The table below (Table 9.4) describes | |
| the list of GL texture internal formats and the corresponding CL image formats. If a GL | |
| texture object with an internal format from the table below 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. Texture objects created with other OpenGL internal formats may | |
| (but are not guaranteed to) have a mapping to a CL image format; if such mappings exist, | |
| they are guaranteed to preserve all color components, data types, and at least the number | |
| of bits/component actually allocated by OpenGL for that format. | |
| </p> | |
| <div class="informaltable"> | |
| <table class="informaltable" border="1"> | |
| <colgroup> | |
| <col align="center" class="col1" /> | |
| <col align="center" class="col2" /> | |
| </colgroup> | |
| <thead> | |
| <tr> | |
| <th align="center">GL internal format</th> | |
| <th align="center">CL image format (channel order, channel data type)</th> | |
| </tr> | |
| </thead> | |
| <tbody> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RGBA8</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_UNORM_INT8 or CL_BGRA, CL_UNORM_INT8</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_SRGBA8_ALPHA8</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_sRGBA, CL_UNORM_INT8</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"><code class="constant">GL_RGBA</code>, <code class="constant">GL_UNSIGNED_INT_8_8_8_8_REV</code></td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_UNORM_INT8</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"><code class="constant">GL_BGRA</code>, <code class="constant">GL_UNSIGNED_INT_8_8_8_8_REV</code></td> | |
| <td align="center"> | |
| <code class="constant">CL_BGRA, CL_UNORM_INT8</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RGBA8I, GL_RGBA8I_EXT</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_SIGNED_INT8</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RGBA16I, GL_RGBA16I_EXT</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_SIGNED_INT16</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RGBA32I, GL_RGBA32I_EXT</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_SIGNED_INT32</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RGBA8UI, GL_RGBA8UI_EXT</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_UNSIGNED_INT8</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RGBA16UI, GL_RGBA16UI_EXT</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_UNSIGNED_INT16</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RGBA32UI, GL_RGBA32UI_EXT</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_UNSIGNED_INT32</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RGBA8_SNORM</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_SNORM_INT8</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RGBA16</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_UNORM_INT16</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RGBA16_SNORM</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_SNORM_INT166</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RGBA16F, GL_RGBA16F_ARB</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_HALF_FLOAT</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RGBA32F, GL_RGBA32F_ARB</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RGBA, CL_FLOAT</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_R8</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_R, CL_UNORM_INT8 </code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_R8_SNORM</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_R, CL_SNORM_INT8 </code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_R16</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_R, CL_UNORM_INT16 </code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_R16_SNORM</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_R, CL_SNORM_INT16 </code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_R16F</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_R, CL_HALF_FLOAT </code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_R32F</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_R, CL_FLOAT </code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_R8I</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_R, CL_SIGNED_INT8</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_R16I</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_R, CL_SIGNED_INT16</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_R32I</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_R, CL_SIGNED_INT32</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_R8UI</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_R, CL_UNSIGNED_INT8</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_R16UI</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_R, CL_UNSIGNED_INT16</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_R32UI</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_R, CL_UNSIGNED_INT32</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RG8</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RG, CL_UNORM_INT8 </code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RG8_SNORM</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RG, CL_SNORM_INT8</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RG16</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RG, CL_UNORM_INT16</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RG16_SNORM</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RG, CL_SNORM_INT16 </code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RG16F</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RG, CL_HALF_FLOAT </code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RG32F</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RG, CL_FLOAT</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RG8I</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RG, CL_SIGNED_INT8</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RG16I</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RG, CL_SIGNED_INT16</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RG32I</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RG, CL_SIGNED_INT32</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RG8UI</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RG, CL_UNSIGNED_INT8</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RG16UI</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RG, CL_UNSIGNED_INT16</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_RG32UI</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_RG, CL_UNSIGNED_INT32</code> | |
| </td> | |
| </tr> | |
| </tbody> | |
| </table> | |
| </div> | |
| <p> | |
| If the <a class="citerefentry" href="cl_khr_gl_depth_images.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_depth_images</span></span></a> | |
| extension is enabled, the | |
| following new image formats are added to table 9.4 in section 9.6.3.1 of the OpenCL 2.0 | |
| 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="center" class="col1" /> | |
| <col align="center" class="col2" /> | |
| </colgroup> | |
| <thead> | |
| <tr> | |
| <th align="center">GL internal format</th> | |
| <th align="center">CL image format (channel order, channel data type)</th> | |
| </tr> | |
| </thead> | |
| <tbody> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_DEPTH_COMPONENT32F</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_DEPTH, CL_FLOAT</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_DEPTH_COMPONENT16</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_DEPTH, CL_UNORM_INT16</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_DEPTH24_STENCIL8</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_DEPTH_STENCIL, CL_UNORM_INT24</code> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="center"> | |
| <code class="constant">GL_DEPTH32F_STENCIL8</code> | |
| </td> | |
| <td align="center"> | |
| <code class="constant">CL_DEPTH_STENCIL, CL_FLOAT</code> | |
| </td> | |
| </tr> | |
| </tbody> | |
| </table> | |
| </div> | |
| <h4><a id="id-1.7.12"></a>Lifetime of [GL] Shared Objects</h4> | |
| <p> | |
| An OpenCL memory object created from an OpenGL object | |
| (hereinafter refered to as a "shared CL/GL object") remains valid as long as the | |
| corresponding GL object has not been deleted. If the GL object is deleted through the GL | |
| API (e.g. <code class="function">glDeleteBuffers</code>, <code class="function">glDeleteTextures</code>, | |
| or <code class="function">glDeleteRenderbuffers</code>), subsequent use of the CL buffer or image | |
| object will result in undefined behavior, including but not limited to possible CL errors | |
| and data corruption, but may not result in program termination. | |
| </p> | |
| <p> | |
| The CL context and corresponding command-queues are dependent | |
| on the existence of the GL share group object, or the share group associated with the | |
| GL context from which the CL context is created. If the GL share group object or all GL | |
| contexts in the share group are destroyed, any use of the CL context or command-queue(s) | |
| will result in undefined behavior, which may include program termination. Applications | |
| should destroy the CL command-queue(s) and CL context before destroying the corresponding | |
| GL share group or contexts. | |
| </p> | |
| <h4><a id="id-1.7.15"></a>Synchronizing OpenCL and OpenGL Access</h4> | |
| <p> | |
| In order to ensure data integrity, the application is responsible | |
| for synchronizing access to shared CL/GL objects by their respective APIs. Failure to | |
| provide such synchronization may result in race conditions and other undefined behavior | |
| including non-portability between implementations. | |
| </p> | |
| <p> | |
| Prior to calling <code class="function">clEnqueueAcquireGLObjects</code>, | |
| the application must ensure that any pending GL operations which access the objects | |
| specified in <code class="varname">mem_objects</code> have completed. This may be accomplished | |
| portably by issuing and waiting for completion of a <code class="function">glFinish</code> | |
| command on all GL contexts with pending references to these objects. Implementations | |
| may offer more efficient synchronization methods; for example on some platforms calling | |
| <code class="function">glFlush</code> may be sufficient, or synchronization may be implicit within | |
| a thread, or there may be vendor-specific extensions that enable placing a fence in the | |
| GL command stream and waiting for completion of that fence in the CL command queue. Note | |
| that no synchronization methods other than <code class="function">glFinish</code> are portable | |
| between OpenGL implementations at this time. | |
| </p> | |
| <p> | |
| When the extension | |
| <a class="citerefentry" href="cl_khr_egl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_event</span></span></a> | |
| is supported: Prior to calling | |
| <code class="function">clEnqueueAcquireGLObjects</code>, | |
| the application must ensure that any pending | |
| EGL or EGL client API operations which access | |
| the objects specified in <code class="varname">mem_objects</code> have | |
| completed. | |
| If the | |
| <a class="citerefentry" href="cl_khr_egl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_event</span></span></a> | |
| extension is supported and the EGL context in question supports fence | |
| sync objects, <span class="emphasis"><em>explicit synchronisation</em></span> can be achieved | |
| as set out in section 5.7.1. | |
| If the | |
| <a class="citerefentry" href="cl_khr_egl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_event</span></span></a> | |
| extension is not supported, completion of EGL client API commands | |
| may be determined by issuing and waiting for completion of commands such as | |
| <code class="function">glFinish</code> or | |
| <code class="function">vgFinish</code> on all client API | |
| contexts with pending references to these objects. Some | |
| implementations may offer other efficient | |
| synchronization methods. If such methods exist they | |
| will be described in platform-specific documentation. | |
| Note that no synchronization methods other than | |
| <code class="function">glFinish</code> and <code class="function">vgFinish</code> | |
| are portable between all | |
| EGL client API implementations and all OpenCL | |
| implementations. While this is the only way to | |
| ensure completion that is portable to all platforms, | |
| these are expensive operation and their use | |
| should be avoided if the | |
| <a class="citerefentry" href="cl_khr_egl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_event</span></span></a> extension | |
| is supported on a platform. | |
| </p> | |
| <p> | |
| Similarly, after calling | |
| <code class="function">clEnqueueReleaseGLObjects</code>, the application is responsible | |
| for ensuring that any pending OpenCL operations which access the objects specified | |
| in <code class="varname">mem_objects</code> have completed prior to executing subsequent GL | |
| commands which reference these objects. This may be accomplished portably by calling | |
| <a class="citerefentry" href="clWaitForEvents.html"><span class="citerefentry"><span class="refentrytitle">clWaitForEvents</span></span></a> with the | |
| event object returned by <code class="function">clEnqueueReleaseGLObjects</code>, or by calling | |
| <a class="citerefentry" href="clFinish.html"><span class="citerefentry"><span class="refentrytitle">clFinish</span></span></a>. As above, some | |
| implementations may offer more efficient methods. | |
| </p> | |
| <p> | |
| The application is responsible for maintaining the proper order | |
| of operations if the CL and GL contexts are in separate threads. | |
| </p> | |
| <p> | |
| If a GL context is bound to a thread other than the one in which | |
| <code class="function">clEnqueueReleaseGLObjects</code> is called, changes to any of the objects in | |
| <code class="varname">mem_objects</code> may not be visible to that context without additional steps | |
| being taken by the application. For an OpenGL 3.1 (or later) context, the requirements | |
| are described in Appendix D ("Shared Objects and Multiple Contexts") of the OpenGL 3.1 | |
| Specification. For prior versions of OpenGL, the requirements are implementation-dependent. | |
| </p> | |
| <p> | |
| Attempting to access the data store of an OpenGL object after | |
| it has been acquired by OpenCL and before it has been released will result in undefined | |
| behavior. Similarly, attempting to access a shared CL/GL object from OpenCL before it | |
| has been acquired by the OpenCL command queue, or after it has been released, will result | |
| in undefined behavior. | |
| </p> | |
| <p> | |
| If the | |
| <a class="citerefentry" href="cl_khr_gl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_event</span></span></a> extension | |
| is supported, then the OpenCL implementation will ensure that any such pending OpenGL | |
| operations are complete for an OpenGL context bound to the same thread as the OpenCL | |
| context. This is referred to as implicit synchronization. | |
| </p> | |
| </div> | |
| <div class="refsect1"> | |
| <a id="errors"></a> | |
| <h2>Errors</h2> | |
| <p> | |
| Returns a valid non-zero OpenCL buffer object and <code class="varname">errcode_ret</code> is set | |
| to <span class="errorname">CL_SUCCESS</span> if the buffer object is created successfully. | |
| Otherwise, it returns a NULL | |
| value with one of the following error values returned in <code class="varname">errcode_ret</code>: | |
| </p> | |
| <div class="itemizedlist"> | |
| <ul class="itemizedlist" style="list-style-type: disc; "> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if <code class="varname">context</code> is not | |
| a valid context or was not created from a GL context. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if values specified in | |
| <code class="varname">flags</code> are not valid. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_GL_OBJECT</span> if <code class="varname">bufobj</code> is not | |
| a GL buffer object or is a GL buffer object but does not have an existing data | |
| store or the size of the buffer is 0. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to allocate | |
| resources required by the OpenCL implementation on the device. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate | |
| resources required by the OpenCL implementation on the host. | |
| </li> | |
| </ul> | |
| </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=47" target="OpenCL Spec">OpenCL Specification</a> | |
| </p> | |
| </div> | |
| <div class="refsect1"> | |
| <a id="seealso"></a> | |
| <h2>Also see</h2> | |
| <p> | |
| <a class="citerefentry" href="cl_khr_gl_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_sharing</span></span></a>, | |
| <a class="citerefentry" href="cl_khr_gl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_event</span></span></a>, | |
| <a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>, | |
| <a class="citerefentry" href="clCreateFromGLTexture.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromGLTexture</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> | |
| </div> | |
| </body> | |
| </html> |