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