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<!-- ================================ SYNOPSIS -->
<refnamediv id="clCreateFromGLTexture">
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.
<refsynopsisdiv xmlns:xlink=""><title></title>
<funcdef><link xlink:href="abstractDataTypes.html">cl_mem</link>
<paramdef><link xlink:href="abstractDataTypes.html">cl_context</link><parameter>context</parameter></paramdef>
<paramdef><link xlink:href="enums.html#cl_mem_flags">cl_mem_flags</link><parameter>flags</parameter></paramdef>
<paramdef><link xlink:href="scalarDataTypes.html">cl_int</link><parameter>* errcode_ret</parameter></paramdef>
<!-- ================================ PARAMETERS -->
<refsect1 id="parameters">
<term> <varname> context </varname> </term>
<para> <!-- parameter description -->
A valid OpenCL context created from an OpenGL context.
<term> <varname> flags </varname> </term>
<!-- parameter description --> A bit-field that is used to
specify usage information. Refer to the table <!-- table 5.3 --> for
table 5.3 --> for a description of <varname>flags</varname>. Only the values
<constant>CL_MEM_READ_ONLY</constant>, <constant>CL_MEM_WRITE_ONLY</constant>
and <constant>CL_MEM_READ_WRITE</constant> can be used.
<term> <varname> texture_target </varname> </term>
<!-- parameter description --> <varname>texture_target</varname>
This value must be one of <constant>GL_TEXTURE_1D</constant>,
<constant>GL_TEXTURE_BUFFER</constant>, <constant>GL_TEXTURE_2D</constant>,
<constant>GL_TEXTURE_2D_ARRAY</constant>, <constant>GL_TEXTURE_3D</constant>,
<constant>GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</constant>, or
<constant>GL_TEXTURE_RECTANGLE</constant>. This requires OpenGL 3.1.
Alternatively, <constant>GL_TEXTURE_RECTANGLE_ARB</constant> may be
specified if the OpenGL extension GL_ARB_texture_rectangle is supported.
<varname>texture_target</varname> is used only to define the image type
of <varname>texture</varname>. No reference to a bound GL texture object
is made or implied by this parameter.
<term> <varname> miplevel </varname> </term>
<!-- parameter description --> The mipmap level to be used. If
<varname>texture_target</varname> is <constant>GL_TEXTURE_BUFFER</constant>,
miplevel must be 0. Implementations may return
<constant>CL_INVALID_OPERATION</constant> for miplevel values > 0
<term> <varname> texture </varname> </term>
<!-- parameter description --> 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
<varname>texture</varname> format and dimensions defined by OpenGL for the
specified <varname>miplevel</varname> 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 may be used to create the OpenCL image memory object.
<term> <varname> errcode_ret </varname> </term>
<!-- parameter description --> Returns an appropriate error code as described
below. If <varname>errcode_ret</varname> is NULL, no error code is returned.
<!-- ================================ DESCRIPTION -->
<refsect1 id="description"><title>Description</title>
<!-- ================================ NOTES -->
<refsect1 id="notes"><title>Notes</title>
If the state of a GL texture object is modified through the GL API
(e.g. <function>glTexImage2D</function>, <function>glTexImage3D</function> or
the values of the texture parameters <constant>GL_TEXTURE_BASE_LEVEL</constant>
or <constant>GL_TEXTURE_MAX_LEVEL</constant> are modified) while there exists a
corresponding CL image object, subsequent use of the CL image object will result in
undefined behavior.
The <citerefentry><refentrytitle>clRetainMemObject</refentrytitle></citerefentry>
and <citerefentry><refentrytitle>clReleaseMemObject</refentrytitle></citerefentry>
functions can be used to retain and release the image objects.
<!-- ================================ ERRORS -->
<refsect1 id="errors"><title>Errors</title>
Returns a valid non-zero OpenCL image object and <varname>errcode_ret</varname>
is set to <errorname>CL_SUCCESS</errorname> if the image object is created
successfully. Otherwise, it returns a NULL value with one of the following error
values returned in <varname>errcode_ret</varname>:
<itemizedlist mark="disc">
<errorname>CL_INVALID_CONTEXT</errorname> if <varname>context</varname> is not
a valid context or was not created from a GL context.
<errorname>CL_INVALID_VALUE</errorname> if values specified in
<varname>flags</varname> are not valid or if value specified in
<varname>texture_target</varname> is not one of the values specified in the
description of <varname>texture_target</varname>.
<errorname>CL_INVALID_MIP_LEVEL</errorname> if <varname>miplevel</varname>
is less than the value of <varname>level<subscript>base</subscript></varname>
(for OpenGL implementations) or zero (for OpenGL ES implementations); or
greater than the value of <varname>q</varname> (for both OpenGL and OpenGL
ES). <varname>level<subscript>base</subscript></varname> and <varname>q</varname>
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.
<errorname>CL_INVALID_MIP_LEVEL</errorname> if <varname>miplevel</varname> is
greater than zero and the OpenGL implementation does not support creating from
non-zero mipmap levels.
<errorname>CL_INVALID_GL_OBJECT</errorname> if <varname>texture</varname> is not
a GL texture object whose type matches <varname>texture_target</varname>, if the
specified <varname>miplevel</varname> of <varname>texture</varname> is not defined,
or if the width or height of the specified <varname>miplevel</varname> is zero.
<errorname>CL_INVALID_IMAGE_FORMAT_DESCRIPTOR</errorname> if the OpenGL texture
internal format does not map to a supported OpenCL image format.
<errorname>CL_INVALID_OPERATION</errorname> if texture is a GL texture object
created with a border width value greater than zero.
<errorname>CL_OUT_OF_RESOURCES</errorname> if there is a failure to allocate
resources required by the OpenCL implementation on the device.
<errorname>CL_OUT_OF_HOST_MEMORY</errorname> if there is a failure to allocate
resources required by the OpenCL implementation on the host.
<!-- ================================ EXAMPLE -->
<refsect2 id="example1">
<informaltable frame="none">
<tgroup cols="1" align="left" colsep="0" rowsep="0">
<colspec colname="col1" colnum="1" />
Example goes here - it will be set in "code" type with white space preserved.
<!-- ================================ SPECIFICATION -->
<!-- Set the "uri" attribute in the <olink /> element to the "named destination" for the PDF page
<refsect1 id="specification"><title>Specification</title>
<imagedata fileref="pdficon_small1.gif" format="gif" />
<olink uri="clCreateFromGLTexture">OpenCL Specification</olink>
<!-- ================================ ALSO SEE -->
<refsect1 id="seealso"><title>Also see</title>
obsolete page replaced by clCreateFromGLTexture
<citerefentry href="cl_khr_gl_sharing"><refentrytitle>cl_khr_gl_sharing</refentrytitle></citerefentry>,
<!-- ============================== COPYRIGHT -->
<!-- Content included from -->
<refsect3 id="Copyright"><title></title>
<imagedata fileref="KhronosLogo.jpg" format="jpg" />
<para />
<!-- 24-oct-2011 -->