NAME

       clCreateFromGLBuffer - Creates an OpenCL buffer object from an OpenGL buffer object.

       cl_mem clCreateFromGLBuffer(cl_context context, cl_mem_flags flags, GLuint bufobj,
                                   cl_int * errcode_ret);

PARAMETERS

        context
           A valid OpenCL context created from an OpenGL context.

        flags
           A bit-field that is used to specify usage information. Refer to the table for
           clCreateBuffer(3clc)for a description of flags. Only CL_MEM_READ_ONLY,
           CL_MEM_WRITE_ONLY and CL_MEM_READ_WRITE values specified in the table at
           clCreateBuffer(3clc)can be used.

        bufobj
           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 glBufferData, 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.

        errcode_ret
           Returns an appropriate error code as described below. If errcode_ret is NULL, no error
           code is returned.

DESCRIPTION

       The size of the GL buffer object data store at the time clCreateFromGLBuffer is called
       will be used as the size of buffer object returned by clCreateFromGLBuffer. If the state
       of a GL buffer object is modified through the GL API (e.g.  glBufferData) while there
       exists a corresponding CL buffer object, subsequent use of the CL buffer object will
       result in undefined behavior.

       The clRetainMemObject(3clc) and clReleaseMemObject(3clc) functions can be used to retain
       and release the buffer object.

       The CL buffer object created using clCreateFromGLBuffer can also be used to create a CL 1D
       image buffer object

ERRORS

       Returns a valid non-zero OpenCL buffer object and errcode_ret is set to CL_SUCCESS if the
       buffer object is created successfully. Otherwise, it returns a NULL value with one of the
       following error values returned in errcode_ret:

       ·   CL_INVALID_CONTEXT if context is not a valid context or was not created from a GL
           context.

       ·   CL_INVALID_VALUE if values specified in flags are not valid.

       ·   CL_INVALID_GL_OBJECT if bufobj is not a GL buffer object or is a GL buffer object but
           does not have an existing data store e or the size of the buffer is 0. .

       ·   CL_OUT_OF_RESOURCES if there is a failure to allocate resources required by the OpenCL
           implementation on the device.

       ·   CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required by the
           OpenCL implementation on the host.

SPECIFICATION

       OpenCL Specification[1]

SEE ALSO

       cl_khr_gl_sharing(3clc), clCreateBuffer(3clc), clReleaseMemObject(3clc),
       clRetainMemObject(3clc)

AUTHORS

       The Khronos Group

COPYRIGHT

       Copyright © 2007-2011 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.

NOTES

        1. OpenCL Specification
           page 49, section 9.7.2 - CL Buffer Objects -> GL Buffer Objects