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| <title>clCreateFromGLTexture</title> |
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| <meta name="keywords" content="clCreateFromGLTexture" /> |
| </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="clCreateFromGLTexture"></a> |
| <h1>clCreateFromGLTexture</h1> |
| <p> |
| Creates an OpenCL image object, image array object, or image buffer object from an OpenGL texture object, |
| texture array object, texture buffer object, or a single face of an OpenGL cubemap texture 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"> |
| clCreateFromGLTexture |
| </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>GLenum <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">texture_target</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td>GLint <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">miplevel</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td>GLuint <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">texture</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 the values |
| <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> can be used. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> texture_target </code> </span> |
| </dt> |
| <dd> |
| <p> |
| <code class="varname">texture_target</code> |
| This value must be one of <code class="constant">GL_TEXTURE_1D</code>, |
| <code class="constant">GL_TEXTURE_1D_ARRAY</code>, |
| <code class="constant">GL_TEXTURE_BUFFER</code>, <code class="constant">GL_TEXTURE_2D</code>, |
| <code class="constant">GL_TEXTURE_2D_ARRAY</code>, <code class="constant">GL_TEXTURE_3D</code>, |
| <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_X</code>, |
| <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Y</code>, |
| <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Z</code>, |
| <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_X</code>, |
| <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Y</code>, |
| <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</code>, or |
| <code class="constant">GL_TEXTURE_RECTANGLE</code>. |
| (<code class="constant">GL_TEXTURE_RECTANGLE</code> requires OpenGL 3.1. |
| Alternatively, <code class="constant">GL_TEXTURE_RECTANGLE_ARB</code> may be |
| specified if the OpenGL extension <code class="code">GL_ARB_texture_rectangle</code> is supported.) |
| <code class="varname">texture_target</code> is used only to define the image type |
| of <code class="varname">texture</code>. No reference to a bound GL texture object |
| is made or implied by this parameter. |
| </p> |
| <p> |
| If the <a class="citerefentry" href="cl_khr_gl_msaa_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_msaa_sharing</span></span></a> |
| extension is enabled, <code class="varname">texture_target</code> |
| may be |
| <code class="constant">GL_TEXTURE_2D_MULTISAMPLE</code> or |
| <code class="constant">GL_TEXTURE_2D_MULTISAMPLE_ARRAY</code>. |
| </p> |
| <p> |
| If <code class="varname">texture_target</code> is |
| <code class="constant">GL_TEXTURE_2D_MULTISAMPLE</code>, |
| <code class="function">clCreateFromGLTexture</code> |
| creates an |
| OpenCL 2D multi-sample image object from |
| an OpenGL 2D multi-sample texture |
| </p> |
| <p> |
| If <code class="varname">texture_target</code> is |
| <code class="constant">GL_TEXTURE_2D_MULTISAMPLE_ARRAY</code>, |
| <code class="function">clCreateFromGLTexture</code> |
| creates an OpenCL 2D multi-sample array |
| image object from an OpenGL 2D multi-sample |
| texture. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> miplevel </code> </span> |
| </dt> |
| <dd> |
| <p> |
| The mipmap level to be used. If |
| <code class="varname">texture_target</code> is <code class="constant">GL_TEXTURE_BUFFER</code>, |
| miplevel must be 0. Implementations may return |
| <code class="constant">CL_INVALID_OPERATION</code> for miplevel values > 0 |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> texture </code> </span> |
| </dt> |
| <dd> |
| <p> |
| The name of a GL 1D, 2D, 3D, 1D array, |
| 2D array, cubemap, rectangle or buffer texture object. The texture object |
| must be a complete texture as per OpenGL rules on texture completeness. The |
| <code class="varname">texture</code> format and dimensions defined by OpenGL for the |
| specified <code class="varname">miplevel</code> of the texture will be used to create |
| the OpenCL image memory object. Only GL texture objects with an internal |
| format that maps to appropriate image channel order and data type specified |
| in tables 5.5 and 5.6 (see |
| <a class="citerefentry" href="cl_image_format.html"><span class="citerefentry"><span class="refentrytitle">cl_image_format</span></span></a>) |
| may be used to create the OpenCL image memory 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="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| If the state of a GL texture object is modified through the GL API |
| (e.g. <code class="function">glTexImage2D</code>, <code class="function">glTexImage3D</code> or |
| the values of the texture parameters <code class="constant">GL_TEXTURE_BASE_LEVEL</code> |
| or <code class="constant">GL_TEXTURE_MAX_LEVEL</code> are modified) while there exists a |
| corresponding CL image object, subsequent use of the CL image 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 image objects. |
| </p> |
| <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-1.6.9"></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 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 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-1.6.14"></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-1.6.17"></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 image object and <code class="varname">errcode_ret</code> |
| is set to <span class="errorname">CL_SUCCESS</span> if the image 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 or if value specified in |
| <code class="varname">texture_target</code> is not one of the values specified in the |
| description of <code class="varname">texture_target</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MIP_LEVEL</span> if <code class="varname">miplevel</code> |
| is less than the value of <code class="varname">level<sub>base</sub></code> |
| (for OpenGL implementations) or zero (for OpenGL ES implementations); or |
| greater than the value of <code class="varname">q</code> (for both OpenGL and OpenGL |
| ES). <code class="varname">level<sub>base</sub></code> and <code class="varname">q</code> |
| are defined for the texture in section 3.8.10 (Texture Completeness) of the OpenGL |
| 2.1 specification and section 3.7.10 of the OpenGL ES 2.0. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MIP_LEVEL</span> if <code class="varname">miplevel</code> is |
| greater than zero and the OpenGL implementation does not support creating from |
| non-zero mipmap levels. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_GL_OBJECT</span> if <code class="varname">texture</code> is not |
| a GL texture object whose type matches <code class="varname">texture_target</code>, if the |
| specified <code class="varname">miplevel</code> of <code class="varname">texture</code> is not defined, |
| or if the width or height of the specified <code class="varname">miplevel</code> is zero |
| or if the GL texture object is incomplete. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_IMAGE_FORMAT_DESCRIPTOR</span> if the OpenGL texture |
| internal format does not map to a supported OpenCL image format. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if <code class="varname">texture</code> is a GL texture object |
| created with a border width value greater than zero. |
| </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=48" 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="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>, |
| <a class="citerefentry" href="clCreateFromGLBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromGLBuffer</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" />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> |
